Delete outdated files [skip ci]

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Miikka Koskinen 2020-07-28 12:53:17 +03:00
parent 71d96d3161
commit cf77d3d645
83 changed files with 47 additions and 17749 deletions

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<h1 id="interceptors">Interceptors</h1>
<p>Reitit also supports <a href="pedestal.io">Pedestal</a>-style <a href="http://pedestal.io/reference/interceptors" target="_blank">interceptors</a>.</p>
<h2 id="work-in-progress">work in progress</h2>
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<h1 id="route-conflicts">Route conflicts</h1>
<p>Many routing libraries allow single path lookup could match multiple routes. Usually, first match is used. This is not good, especially if route tree is merged from multiple sources - routes might regress to be unreachable without a warning.</p>
<p>Reitit resolves this by running explicit conflicit resolution when a <code>Router</code> is created. Conflicting routes are passed into a <code>:conflicts</code> callback. Default implementation throws <code>ex-info</code> with a descriptive message.</p>
<p>Examples routes with conflicts:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> reitit])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
[[<span class="hljs-string">&quot;/ping&quot;</span>]
[<span class="hljs-string">&quot;/:user-id/orders&quot;</span>]
[<span class="hljs-string">&quot;/bulk/:bulk-id&quot;</span>]
[<span class="hljs-string">&quot;/public/*path&quot;</span>]
[<span class="hljs-string">&quot;/:version/status&quot;</span>]])
</code></pre>
<p>By default, <code>ExceptionInfo</code> is thrown:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/router</span> routes)
<span class="hljs-comment">; CompilerException clojure.lang.ExceptionInfo: Router contains conflicting routes:</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /:user-id/orders</span>
<span class="hljs-comment">; -&gt; /public/*path</span>
<span class="hljs-comment">; -&gt; /bulk/:bulk-id</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /bulk/:bulk-id</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /public/*path</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
</code></pre>
<p>Just logging the conflicts:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/router</span>
routes
{<span class="hljs-symbol">:conflicts</span> (<span class="hljs-name"><span class="hljs-builtin-name">comp</span></span> println reitit/conflicts-str)})
<span class="hljs-comment">; Router contains conflicting routes:</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /:user-id/orders</span>
<span class="hljs-comment">; -&gt; /public/*path</span>
<span class="hljs-comment">; -&gt; /bulk/:bulk-id</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /bulk/:bulk-id</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /public/*path</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
</code></pre>
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<h1 id="route-syntax">Route Syntax</h1>
<p>Raw routes are defined as vectors, which have a String path, optional (non-sequential) route argument and optional child routes. Routes can be wrapped in vectors and lists and <code>nil</code> routes are ignored. Paths can have path-parameters (<code>:id</code>) or catch-all-parameters (<code>*path</code>).</p>
<p>Simple route:</p>
<pre><code class="lang-clj">[<span class="hljs-string">&quot;/ping&quot;</span>]
</code></pre>
<p>Two routes:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/ping&quot;</span>]
[<span class="hljs-string">&quot;/pong&quot;</span>]]
</code></pre>
<p>Routes with route arguments:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/pong&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::pong</span>}]]
</code></pre>
<p>Routes with path parameters:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/users/:user-id&quot;</span>]
[<span class="hljs-string">&quot;/api/:version/ping&quot;</span>]]
</code></pre>
<p>Route with catch-all parameter:</p>
<pre><code class="lang-clj">[<span class="hljs-string">&quot;/public/*path&quot;</span>]
</code></pre>
<p>Nested routes:</p>
<pre><code class="lang-clj">[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/admin&quot;</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>]}
[<span class="hljs-string">&quot;&quot;</span> <span class="hljs-symbol">::admin</span>]
[<span class="hljs-string">&quot;/db&quot;</span> <span class="hljs-symbol">::db</span>]]
[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]]
</code></pre>
<p>Same routes flattened:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/api/admin&quot;</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>], <span class="hljs-symbol">:name</span> <span class="hljs-symbol">::admin</span>}]
[<span class="hljs-string">&quot;/api/admin/db&quot;</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>], <span class="hljs-symbol">:name</span> <span class="hljs-symbol">::db</span>}]
[<span class="hljs-string">&quot;/api/ping&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::ping</span>}]]
</code></pre>
<p>As routes are just data, it&apos;s easy to create them programamtically:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> cqrs-routes [actions dev-mode?]
[<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::api</span> <span class="hljs-symbol">::db</span>]}
(<span class="hljs-name"><span class="hljs-builtin-name">for</span></span> [[type interceptor] actions
<span class="hljs-symbol">:let</span> [path (<span class="hljs-name"><span class="hljs-builtin-name">str</span></span> <span class="hljs-string">&quot;/&quot;</span> (<span class="hljs-name"><span class="hljs-builtin-name">name</span></span> interceptor))
method (<span class="hljs-name"><span class="hljs-builtin-name">condp</span></span> = type
<span class="hljs-symbol">:query</span> <span class="hljs-symbol">:get</span>
<span class="hljs-symbol">:command</span> <span class="hljs-symbol">:post</span>)]]
[path {method {<span class="hljs-symbol">:interceptors</span> [interceptor]}}])
(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> dev-mode? [<span class="hljs-string">&quot;/dev-tools&quot;</span> <span class="hljs-symbol">::dev-tools</span>])])
</code></pre>
<pre><code class="lang-clj">(<span class="hljs-name">cqrs-routes</span>
[[<span class="hljs-symbol">:query</span> &apos;get-user]
[<span class="hljs-symbol">:command</span> &apos;add-user]
[<span class="hljs-symbol">:command</span> &apos;add-order]]
<span class="hljs-literal">false</span>)
<span class="hljs-comment">; [&quot;/api&quot; {:interceptors [::api ::db]}</span>
<span class="hljs-comment">; ([&quot;/get-user&quot; {:get {:interceptors [get-user]}}]</span>
<span class="hljs-comment">; [&quot;/add-user&quot; {:post {:interceptors [add-user]}}]</span>
<span class="hljs-comment">; [&quot;/add-order&quot; {:post {:interceptors [add-order]}}])</span>
<span class="hljs-comment">; nil]</span>
</code></pre>
<h1 id="router">Router</h1>
<p>Routes are just data and to do actual routing, we need a Router satisfying the <code>reitit.core/Router</code> protocol. Routers are created with <code>reitit.core/router</code> function, taking the raw routes and optionally an options map. Raw routes gets expanded and optionally coerced and compiled.</p>
<p><code>Router</code> protocol:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defprotocol</span></span> Router
(<span class="hljs-name">router-name</span> [this])
(<span class="hljs-name">routes</span> [this])
(<span class="hljs-name">options</span> [this])
(<span class="hljs-name">route-names</span> [this])
(<span class="hljs-name">match-by-path</span> [this path])
(<span class="hljs-name">match-by-name</span> [this name] [this name params]))
</code></pre>
<p>Creating a router:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/user/:id&quot;</span> <span class="hljs-symbol">::user</span>]]]))
</code></pre>
<p>Router flattens the raw routes and expands the route arguments using <code>reitit.core/Expand</code> protocol. By default, <code>Keyword</code>s are expanded to <code>:name</code> and functions are expaned to <code>:handler</code>. <code>nil</code> routes are removed. The expanded routes can be retrieved with router:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/routes</span> router)
<span class="hljs-comment">; [[&quot;/api/ping&quot; {:name :user/ping}]</span>
<span class="hljs-comment">; [&quot;/api/user/:id&quot; {:name :user/user}]]</span>
</code></pre>
<h2 id="path-based-routing">Path-based routing</h2>
<p>Path-based routing is done using the <code>reitit.core/match-by-path</code> function. It takes the router and path as arguments and returns one of the following:</p>
<ul>
<li><code>nil</code>, no match</li>
<li><code>PartialMatch</code>, path matched, missing path-parameters (only in reverse-routing)</li>
<li><code>Match</code>, exact match</li>
</ul>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">&quot;/hello&quot;</span>)
<span class="hljs-comment">; nil</span>
</code></pre>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">&quot;/api/user/1&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/api/user/:id&quot;</span>
<span class="hljs-comment">; :meta {:name :user/user}</span>
<span class="hljs-comment">; :path &quot;/api/user/1&quot;</span>
<span class="hljs-comment">; :result nil</span>
<span class="hljs-comment">; :params {:id &quot;1&quot;}}</span>
</code></pre>
<h2 id="name-based-routing">Name-based routing</h2>
<p>All routes which <code>:name</code> route data defined, can be matched by name.</p>
<p>Listing all route names:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/route-names</span> router)
<span class="hljs-comment">; [:user/ping :user/user]</span>
</code></pre>
<p>Matching by name:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-name</span> router <span class="hljs-symbol">::user</span>)
<span class="hljs-comment">; #PartialMatch{:template &quot;/api/user/:id&quot;,</span>
<span class="hljs-comment">; :meta {:name :user/user},</span>
<span class="hljs-comment">; :result nil,</span>
<span class="hljs-comment">; :params nil,</span>
<span class="hljs-comment">; :required #{:id}}</span>
(<span class="hljs-name">r/partial-match?</span> (<span class="hljs-name">r/match-by-name</span> router <span class="hljs-symbol">::user</span>))
<span class="hljs-comment">; true</span>
</code></pre>
<p>We only got a partial match as we didn&apos;t provide the needed path-parameters. Let&apos;s provide the them too:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-name</span> router <span class="hljs-symbol">::user</span> {<span class="hljs-symbol">:id</span> <span class="hljs-string">&quot;1&quot;</span>})
<span class="hljs-comment">; #Match{:template &quot;/api/user/:id&quot;</span>
<span class="hljs-comment">; :meta {:name :user/user}</span>
<span class="hljs-comment">; :path &quot;/api/user/1&quot;</span>
<span class="hljs-comment">; :result nil</span>
<span class="hljs-comment">; :params {:id &quot;1&quot;}}</span>
</code></pre>
<p>There is also a exception throwing version:</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-name!</span> router <span class="hljs-symbol">::user</span>)
<span class="hljs-comment">; ExceptionInfo missing path-params for route /api/user/:id: #{:id}</span>
</code></pre>
<h1 id="route-data">Route data</h1>
<p>Routes can have arbitrary meta-data, interpreted by the router (via it&apos;s <code>:compile</code> hook) or the application itself. For nested routes, route data is accumulated recursively using <a href="https://github.com/weavejester/meta-merge" target="_blank">meta-merge</a>. By default, it appends collections, but it can be overridden to do <code>:prepend</code>, <code>:replace</code> or <code>:displace</code>.</p>
<p>An example router with nested data:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::api</span>]}
[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/admin&quot;</span> {<span class="hljs-symbol">:roles</span> #{<span class="hljs-symbol">:admin</span>}}
[<span class="hljs-string">&quot;/users&quot;</span> <span class="hljs-symbol">::users</span>]
[<span class="hljs-string">&quot;/db&quot;</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::db</span>]
<span class="hljs-symbol">:roles</span> ^<span class="hljs-symbol">:replace</span> #{<span class="hljs-symbol">:db-admin</span>}}
[<span class="hljs-string">&quot;/:db&quot;</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:db</span> String}}
[<span class="hljs-string">&quot;/drop&quot;</span> <span class="hljs-symbol">::drop-db</span>]
[<span class="hljs-string">&quot;/stats&quot;</span> <span class="hljs-symbol">::db-stats</span>]]]]]))
</code></pre>
<p>Resolved route tree:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/routes</span> router)
<span class="hljs-comment">; [[&quot;/api/ping&quot; {:interceptors [::api]</span>
<span class="hljs-comment">; :name ::ping}]</span>
<span class="hljs-comment">; [&quot;/api/admin/users&quot; {:interceptors [::api]</span>
<span class="hljs-comment">; :roles #{:admin}</span>
<span class="hljs-comment">; :name ::users}]</span>
<span class="hljs-comment">; [&quot;/api/admin/db/:db/drop&quot; {:interceptors [::api ::db]</span>
<span class="hljs-comment">; :roles #{:db-admin}</span>
<span class="hljs-comment">; :parameters {:db String}</span>
<span class="hljs-comment">; :name ::drop-db}]</span>
<span class="hljs-comment">; [&quot;/api/admin/db/:db/stats&quot; {:interceptors [::api ::db]</span>
<span class="hljs-comment">; :roles #{:db-admin}</span>
<span class="hljs-comment">; :parameters {:db String}</span>
<span class="hljs-comment">; :name ::db-stats}]]</span>
</code></pre>
<p>Route data is returned with <code>Match</code> and the application can act based on it.</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">&quot;/api/admin/db/users/drop&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/api/admin/db/:db/drop&quot;</span>
<span class="hljs-comment">; :meta {:interceptors [::api ::db]</span>
<span class="hljs-comment">; :roles #{:db-admin}</span>
<span class="hljs-comment">; :parameters {:db String}</span>
<span class="hljs-comment">; :name ::drop-db}</span>
<span class="hljs-comment">; :result nil</span>
<span class="hljs-comment">; :params {:db &quot;users&quot;}</span>
<span class="hljs-comment">; :path &quot;/api/admin/db/users/drop&quot;}</span>
</code></pre>
<h1 id="different-routers">Different Routers</h1>
<p>Reitit ships with several different implementations for the <code>Router</code> protocol, originally based on the awesome <a href="https://github.com/pedestal/pedestal/tree/master/route" target="_blank">Pedestal</a> implementation. <code>router</code> selects the most suitable implementation by inspecting the expanded routes. The implementation can be set manually using <code>:router</code> ROUTER OPTION.</p>
<table>
<thead>
<tr>
<th>router</th>
<th>description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>:linear-router</code></td>
<td>Matches the routes one-by-one starting from the top until a match is found. Works with any kind of routes.</td>
</tr>
<tr>
<td><code>:lookup-router</code></td>
<td>Fastest router, uses hash-lookup to resolve the route. Valid if no paths have path or catch-all parameters.</td>
</tr>
<tr>
<td><code>:mixed-router</code></td>
<td>Creates internally a <code>:linear-router</code> and a <code>:lookup-router</code> and used them to effectively get best-of-both-worlds. Valid if there are no CONFLICTING ROUTES.</td>
</tr>
<tr>
<td><code>:prefix-tree-router</code></td>
<td><a href="https://github.com/julienschmidt/httprouter#how-does-it-work" target="_blank">TODO</a></td>
</tr>
</tbody>
</table>
<p>The router name can be asked from the router</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/router-name</span> router)
<span class="hljs-comment">; :mixed-router</span>
</code></pre>
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<h1 id="different-routers">Different Routers</h1>
<p>Reitit ships with several different implementations for the <code>Router</code> protocol, originally based on the awesome <a href="https://github.com/pedestal/pedestal/tree/master/route" target="_blank">Pedestal</a> implementation. <code>router</code> selects the most suitable implementation by inspecting the expanded routes. The implementation can be set manually using <code>:router</code> ROUTER OPTION.</p>
<table>
<thead>
<tr>
<th>router</th>
<th>description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>:linear-router</code></td>
<td>Matches the routes one-by-one starting from the top until a match is found. Works with any kind of routes.</td>
</tr>
<tr>
<td><code>:lookup-router</code></td>
<td>Fastest router, uses hash-lookup to resolve the route. Valid if no paths have path or catch-all parameters.</td>
</tr>
<tr>
<td><code>:mixed-router</code></td>
<td>Creates internally a <code>:linear-router</code> and a <code>:lookup-router</code> and used them to effectively get best-of-both-worlds. Valid if there are no CONFLICTING ROUTES.</td>
</tr>
<tr>
<td><code>:prefix-tree-router</code></td>
<td><a href="https://github.com/julienschmidt/httprouter#how-does-it-work" target="_blank">TODO</a></td>
</tr>
</tbody>
</table>
<p>The router name can be asked from the router</p>
<pre><code class="lang-clj">(<span class="hljs-name">r/router-name</span> router)
<span class="hljs-comment">; :mixed-router</span>
</code></pre>
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<h1 id="compiling-middleware">Compiling Middleware</h1>
<p>The <a href="ring.html#meta-data-based-extensions">meta-data extensions</a> are a easy way to extend the system. Routes meta-data can be transformed into any shape (records, functions etc.) in route compilation, enabling fast access at request-time.</p>
<p>Still, we can do better. As we know the exact route that interceptor/middleware is linked to, we can pass the (compiled) route information into the interceptor/middleware at creation-time. It can extract and transform relevant data just for it and pass it into the actual request-handler via a closure - yielding faster runtime processing.</p>
<p>To do this we use <a href="ring.html#middleware-records">middleware records</a> <code>:gen</code> hook instead of the normal <code>:wrap</code>. <code>:gen</code> expects a function of <code>route-meta router-opts =&gt; wrap</code>. Middleware can also return <code>nil</code>, which effective unmounts the middleware. Why mount a <code>wrap-enforce-roles</code> middleware for a route if there are no roles required for it?</p>
<p>To demonstrate the two approaches, below are response coercion middleware written as normal ring middleware function and as middleware record with <code>:gen</code>. These are the actual codes are from <a href="https://github.com/metosin/reitit/blob/master/src/reitit/coercion.cljc" target="_blank"><code>reitit.coercion</code></a>:</p>
<h2 id="naive">Naive</h2>
<ul>
<li>Extracts the compiled route information on every request.</li>
</ul>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> wrap-coerce-response
<span class="hljs-string">&quot;Pluggable response coercion middleware.
Expects a :coercion of type `reitit.coercion.protocol/Coercion`
and :responses from route meta, otherwise does not mount.&quot;</span>
[handler]
(<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span>
([request]
(<span class="hljs-name"><span class="hljs-builtin-name">let</span></span> [response (<span class="hljs-name">handler</span> request)
method (<span class="hljs-symbol">:request-method</span> request)
match (<span class="hljs-name">ring/get-match</span> request)
responses (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> match <span class="hljs-symbol">:result</span> method <span class="hljs-symbol">:meta</span> <span class="hljs-symbol">:responses</span>)
coercion (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> match <span class="hljs-symbol">:meta</span> <span class="hljs-symbol">:coercion</span>)
opts (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> match <span class="hljs-symbol">:meta</span> <span class="hljs-symbol">:opts</span>)]
(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">and</span></span> coercion responses)
(<span class="hljs-name"><span class="hljs-builtin-name">let</span></span> [coercers (<span class="hljs-name">response-coercers</span> coercion responses opts)
coerced (<span class="hljs-name">coerce-response</span> coercers request response)]
(<span class="hljs-name">coerce-response</span> coercers request (<span class="hljs-name">handler</span> request)))
(<span class="hljs-name">handler</span> request))))
([request respond raise]
(<span class="hljs-name"><span class="hljs-builtin-name">let</span></span> [response (<span class="hljs-name">handler</span> request)
method (<span class="hljs-symbol">:request-method</span> request)
match (<span class="hljs-name">ring/get-match</span> request)
responses (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> match <span class="hljs-symbol">:result</span> method <span class="hljs-symbol">:meta</span> <span class="hljs-symbol">:responses</span>)
coercion (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> match <span class="hljs-symbol">:meta</span> <span class="hljs-symbol">:coercion</span>)
opts (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> match <span class="hljs-symbol">:meta</span> <span class="hljs-symbol">:opts</span>)]
(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">and</span></span> coercion responses)
(<span class="hljs-name"><span class="hljs-builtin-name">let</span></span> [coercers (<span class="hljs-name">response-coercers</span> coercion responses opts)
coerced (<span class="hljs-name">coerce-response</span> coercers request response)]
(<span class="hljs-name">handler</span> request #(<span class="hljs-name">respond</span> (<span class="hljs-name">coerce-response</span> coercers request %))))
(<span class="hljs-name">handler</span> request respond raise))))))
</code></pre>
<h2 id="compiled">Compiled</h2>
<ul>
<li>Route information is provided via a closure</li>
<li>Pre-compiled coercers</li>
<li>Mounts only if <code>:coercion</code> and <code>:responses</code> are defined for the route</li>
</ul>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> gen-wrap-coerce-response
<span class="hljs-string">&quot;Generator for pluggable response coercion middleware.
Expects a :coercion of type `reitit.coercion.protocol/Coercion`
and :responses from route meta, otherwise does not mount.&quot;</span>
(<span class="hljs-name">middleware/create</span>
{<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::coerce-response</span>
<span class="hljs-symbol">:gen</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{<span class="hljs-symbol">:keys</span> [responses coercion opts]} _]
(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">and</span></span> coercion responses)
(<span class="hljs-name"><span class="hljs-builtin-name">let</span></span> [coercers (<span class="hljs-name">response-coercers</span> coercion responses opts)]
(<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [handler]
(<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span>
([request]
(<span class="hljs-name">coerce-response</span> coercers request (<span class="hljs-name">handler</span> request)))
([request respond raise]
(<span class="hljs-name">handler</span> request #(<span class="hljs-name">respond</span> (<span class="hljs-name">coerce-response</span> coercers request %)) raise)))))))}))
</code></pre>
<p>The <code>:gen</code> -version has 50% less code, is easier to reason about and is 2-4x faster on basic perf tests.</p>
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Dynamic extensions
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<h2 id="configuring-routers">Configuring Routers</h2>
<p>Routers can be configured via options. Options allow things like <a href="https://clojure.org/about/spec" target="_blank"><code>clojure.spec</code></a> validation for meta-data and fast, compiled handlers. The following options are available for the <code>reitit.core/router</code>:</p>
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<th>key</th>
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<td><code>:path</code></td>
<td>Base-path for routes</td>
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<tr>
<td><code>:routes</code></td>
<td>Initial resolved routes (default <code>[]</code>)</td>
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<td><code>:meta</code></td>
<td>Initial expanded route-meta vector (default <code>[]</code>)</td>
</tr>
<tr>
<td><code>:expand</code></td>
<td>Function of <code>arg opts =&gt; meta</code> to expand route arg to route meta-data (default <code>reitit.core/expand</code>)</td>
</tr>
<tr>
<td><code>:coerce</code></td>
<td>Function of <code>route opts =&gt; route</code> to coerce resolved route, can throw or return <code>nil</code></td>
</tr>
<tr>
<td><code>:compile</code></td>
<td>Function of <code>route opts =&gt; result</code> to compile a route handler</td>
</tr>
<tr>
<td><code>:conflicts</code></td>
<td>Function of <code>{route #{route}} =&gt; side-effect</code> to handle conflicting routes (default <code>reitit.core/throw-on-conflicts!</code>)</td>
</tr>
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<td><code>:router</code></td>
<td>Function of <code>routes opts =&gt; router</code> to override the actual router implementation</td>
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<h1 id="dynamic-extensions">Dynamic extensions</h1>
<p><code>ring-handler</code> injects the <code>Match</code> into a request and it can be extracted at runtime with <code>reitit.ring/get-match</code>. This can be used to build dynamic extensions to the system.</p>
<p>Example middleware to guard routes based on user roles:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[clojure.set <span class="hljs-symbol">:as</span> set])
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> wrap-enforce-roles [handler]
(<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{<span class="hljs-symbol">:keys</span> [<span class="hljs-symbol">::roles</span>] <span class="hljs-symbol">:as</span> request}]
(<span class="hljs-name"><span class="hljs-builtin-name">let</span></span> [required (<span class="hljs-name">some-&gt;</span> request (<span class="hljs-name">ring/get-match</span>) <span class="hljs-symbol">:meta</span> <span class="hljs-symbol">::roles</span>)]
(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">and</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">seq</span></span> required) (<span class="hljs-name"><span class="hljs-builtin-name">not</span></span> (<span class="hljs-name">set/intersection</span> required roles)))
{<span class="hljs-symbol">:status</span> <span class="hljs-number">403</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;forbidden&quot;</span>}
(<span class="hljs-name">handler</span> request)))))
</code></pre>
<p>Mounted to an app via router meta-data (effecting all routes):</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> handler (<span class="hljs-name"><span class="hljs-builtin-name">constantly</span></span> {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;ok&quot;</span>}))
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> handler]
[<span class="hljs-string">&quot;/admin&quot;</span> {<span class="hljs-symbol">::roles</span> #{<span class="hljs-symbol">:admin</span>}}
[<span class="hljs-string">&quot;/ping&quot;</span> handler]]]]
{<span class="hljs-symbol">:meta</span> {<span class="hljs-symbol">:middleware</span> [wrap-enforce-roles]}})))
</code></pre>
<p>Anonymous access to public route:</p>
<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
<span class="hljs-comment">; {:status 200, :body &quot;ok&quot;}</span>
</code></pre>
<p>Anonymous access to guarded route:</p>
<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/admin/ping&quot;</span>})
<span class="hljs-comment">; {:status 403, :body &quot;forbidden&quot;}</span>
</code></pre>
<p>Authorized access to guarded route:</p>
<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/admin/ping&quot;</span>, <span class="hljs-symbol">::roles</span> #{<span class="hljs-symbol">:admin</span>}})
<span class="hljs-comment">; {:status 200, :body &quot;ok&quot;}</span>
</code></pre>
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gitbook.page.hasChanged({"page":{"title":"FAQ","level":"8.3","depth":1,"previous":{"title":"Development Instructions","level":"8.2","depth":1,"path":"development.md","ref":"development.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"faq.md","mtime":"2020-01-14T13:47:50.979Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-07-24T11:08:28.724Z"},"basePath":".","book":{"language":""}});
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});
</script>
</div>

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@ -1,5 +0,0 @@
# Frontend
* [Basics](basics.md)
* [Browser integration](browser.md)
* [Controllers](controllers.md)

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@ -866,7 +866,7 @@ React breaking due to errors.</p>
<script>
var gitbook = gitbook || [];
gitbook.push(function() {
gitbook.page.hasChanged({"page":{"title":"Basics","level":"6.1","depth":1,"next":{"title":"Browser integration","level":"6.2","depth":1,"path":"frontend/browser.md","ref":"frontend/browser.md","articles":[]},"previous":{"title":"Transforming Interceptor Chain","level":"5.5","depth":1,"path":"http/transforming_interceptor_chain.md","ref":"http/transforming_interceptor_chain.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"frontend/basics.md","mtime":"2020-01-14T13:47:50.980Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-07-24T11:08:28.724Z"},"basePath":"..","book":{"language":""}});
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});
</script>
</div>

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@ -1,3 +0,0 @@
# Frontend basics
TODO

View file

@ -889,7 +889,7 @@ go back or forwards, but calling History API functions directly should work:</p>
<script>
var gitbook = gitbook || [];
gitbook.push(function() {
gitbook.page.hasChanged({"page":{"title":"Browser integration","level":"6.2","depth":1,"next":{"title":"Controllers","level":"6.3","depth":1,"path":"frontend/controllers.md","ref":"frontend/controllers.md","articles":[]},"previous":{"title":"Basics","level":"6.1","depth":1,"path":"frontend/basics.md","ref":"frontend/basics.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"frontend/browser.md","mtime":"2020-01-14T13:47:50.981Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-07-24T11:08:28.724Z"},"basePath":"..","book":{"language":""}});
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});
</script>
</div>

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@ -1,3 +0,0 @@
# Frontend browser integration
TODO

View file

@ -946,7 +946,7 @@ missing resources.</p>
<script>
var gitbook = gitbook || [];
gitbook.push(function() {
gitbook.page.hasChanged({"page":{"title":"Controllers","level":"6.3","depth":1,"next":{"title":"Configuring Routers","level":"7.1","depth":1,"path":"advanced/configuring_routers.md","ref":"advanced/configuring_routers.md","articles":[]},"previous":{"title":"Browser integration","level":"6.2","depth":1,"path":"frontend/browser.md","ref":"frontend/browser.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"frontend/controllers.md","mtime":"2020-01-14T13:47:50.982Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-07-24T11:08:28.724Z"},"basePath":"..","book":{"language":""}});
gitbook.page.hasChanged({"page":{"title":"Controllers","level":"6.3","depth":1,"next":{"title":"Configuring Routers","level":"7.1","depth":1,"path":"advanced/configuring_routers.md","ref":"advanced/configuring_routers.md","articles":[]},"previous":{"title":"Browser integration","level":"6.2","depth":1,"path":"frontend/browser.md","ref":"frontend/browser.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"frontend/controllers.md","mtime":"2020-01-14T13:47:50.982Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-07-28T09:52:25.779Z"},"basePath":"..","book":{"language":""}});
});
</script>
</div>

View file

@ -1,3 +0,0 @@
# Controllers
TODO

View file

@ -1,838 +0,0 @@
<!DOCTYPE HTML>
<html lang="" >
<head>
<meta charset="UTF-8">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>Frontend · GitBook</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="description" content="">
<meta name="generator" content="GitBook 3.2.3">
<link rel="stylesheet" href="../gitbook/style.css">
<link rel="stylesheet" href="../gitbook/gitbook-plugin-highlight/website.css">
<link rel="stylesheet" href="../gitbook/gitbook-plugin-search/search.css">
<link rel="stylesheet" href="../gitbook/gitbook-plugin-fontsettings/website.css">
<meta name="HandheldFriendly" content="true"/>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<link rel="apple-touch-icon-precomposed" sizes="152x152" href="../gitbook/images/apple-touch-icon-precomposed-152.png">
<link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon">
<link rel="next" href="basics.html" />
<link rel="prev" href="../patterns/shared_routes.html" />
</head>
<body>
<div class="book">
<div class="book-summary">
<div id="book-search-input" role="search">
<input type="text" placeholder="Type to search" />
</div>
<nav role="navigation">
<ul class="summary">
<li class="chapter " data-level="1.1" data-path="../">
<a href="../">
Introduction
</a>
</li>
<li class="chapter " data-level="1.2" data-path="../basics/">
<a href="../basics/">
Basics
</a>
<ul class="articles">
<li class="chapter " data-level="1.2.1" data-path="../basics/route_syntax.html">
<a href="../basics/route_syntax.html">
Route Syntax
</a>
</li>
<li class="chapter " data-level="1.2.2" data-path="../basics/router.html">
<a href="../basics/router.html">
Router
</a>
</li>
<li class="chapter " data-level="1.2.3" data-path="../basics/path_based_routing.html">
<a href="../basics/path_based_routing.html">
Path-based Routing
</a>
</li>
<li class="chapter " data-level="1.2.4" data-path="../basics/name_based_routing.html">
<a href="../basics/name_based_routing.html">
Name-based Routing
</a>
</li>
<li class="chapter " data-level="1.2.5" data-path="../basics/route_data.html">
<a href="../basics/route_data.html">
Route Data
</a>
</li>
<li class="chapter " data-level="1.2.6" data-path="../basics/route_data_validation.html">
<a href="../basics/route_data_validation.html">
Route Data Validation
</a>
</li>
<li class="chapter " data-level="1.2.7" data-path="../basics/route_conflicts.html">
<a href="../basics/route_conflicts.html">
Route Conflicts
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.3" data-path="../coercion/">
<a href="../coercion/">
Coercion
</a>
<ul class="articles">
<li class="chapter " data-level="1.3.1" data-path="../coercion/coercion.html">
<a href="../coercion/coercion.html">
Coercion Explained
</a>
</li>
<li class="chapter " data-level="1.3.2" data-path="../coercion/schema_coercion.html">
<a href="../coercion/schema_coercion.html">
Plumatic Schema
</a>
</li>
<li class="chapter " data-level="1.3.3" data-path="../coercion/clojure_spec_coercion.html">
<a href="../coercion/clojure_spec_coercion.html">
Clojure.spec
</a>
</li>
<li class="chapter " data-level="1.3.4" data-path="../coercion/data_spec_coercion.html">
<a href="../coercion/data_spec_coercion.html">
Data-specs
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.4" data-path="../ring/">
<a href="../ring/">
Ring
</a>
<ul class="articles">
<li class="chapter " data-level="1.4.1" data-path="../ring/ring.html">
<a href="../ring/ring.html">
Ring-router
</a>
</li>
<li class="chapter " data-level="1.4.2" data-path="../ring/reverse_routing.html">
<a href="../ring/reverse_routing.html">
Reverse-routing
</a>
</li>
<li class="chapter " data-level="1.4.3" data-path="../ring/default_handler.html">
<a href="../ring/default_handler.html">
Default handler
</a>
</li>
<li class="chapter " data-level="1.4.4" data-path="../ring/static.html">
<a href="../ring/static.html">
Static Resources
</a>
</li>
<li class="chapter " data-level="1.4.5" data-path="../ring/dynamic_extensions.html">
<a href="../ring/dynamic_extensions.html">
Dynamic Extensions
</a>
</li>
<li class="chapter " data-level="1.4.6" data-path="../ring/data_driven_middleware.html">
<a href="../ring/data_driven_middleware.html">
Data-driven Middleware
</a>
</li>
<li class="chapter " data-level="1.4.7" data-path="../ring/transforming_middleware_chain.html">
<a href="../ring/transforming_middleware_chain.html">
Transforming Middleware Chain
</a>
</li>
<li class="chapter " data-level="1.4.8" data-path="../ring/middleware_registry.html">
<a href="../ring/middleware_registry.html">
Middleware Registry
</a>
</li>
<li class="chapter " data-level="1.4.9" data-path="../ring/default_middleware.html">
<a href="../ring/default_middleware.html">
Default Middleware
</a>
</li>
<li class="chapter " data-level="1.4.10" data-path="../ring/coercion.html">
<a href="../ring/coercion.html">
Pluggable Coercion
</a>
</li>
<li class="chapter " data-level="1.4.11" data-path="../ring/route_data_validation.html">
<a href="../ring/route_data_validation.html">
Route Data Validation
</a>
</li>
<li class="chapter " data-level="1.4.12" data-path="../ring/compiling_middleware.html">
<a href="../ring/compiling_middleware.html">
Compiling Middleware
</a>
</li>
<li class="chapter " data-level="1.4.13" data-path="../ring/swagger.html">
<a href="../ring/swagger.html">
Swagger Support
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.5" data-path="../advanced/">
<a href="../advanced/">
Advanced
</a>
<ul class="articles">
<li class="chapter " data-level="1.5.1" data-path="../advanced/configuring_routers.html">
<a href="../advanced/configuring_routers.html">
Configuring Routers
</a>
</li>
<li class="chapter " data-level="1.5.2" data-path="../advanced/composing_routers.html">
<a href="../advanced/composing_routers.html">
Composing Routers
</a>
</li>
<li class="chapter " data-level="1.5.3" data-path="../advanced/different_routers.html">
<a href="../advanced/different_routers.html">
Different Routers
</a>
</li>
<li class="chapter " data-level="1.5.4" data-path="../advanced/route_validation.html">
<a href="../advanced/route_validation.html">
Route Validation
</a>
</li>
<li class="chapter " data-level="1.5.5" data-path="../advanced/dev_workflow.html">
<a href="../advanced/dev_workflow.html">
Dev Workflow
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.6" data-path="../patterns/">
<a href="../patterns/">
Patterns
</a>
<ul class="articles">
<li class="chapter " data-level="1.6.1" data-path="../patterns/shared_routes.html">
<a href="../patterns/shared_routes.html">
Shared Routes
</a>
</li>
</ul>
</li>
<li class="chapter active" data-level="1.7" data-path="./">
<a href="./">
Frontend
</a>
<ul class="articles">
<li class="chapter " data-level="1.7.1" data-path="basics.html">
<a href="basics.html">
Basics
</a>
</li>
<li class="chapter " data-level="1.7.2" data-path="browser.html">
<a href="browser.html">
Browser integration
</a>
</li>
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<a href="." >Interceptors (WIP)</a>
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<h1 id="interceptors-wip">Interceptors (WIP)</h1>
<p>Reitit also support for <a href="pedestal.io">Pedestal</a>-style <a href="http://pedestal.io/reference/interceptors" target="_blank">interceptors</a> as an alternative to Middleware. Basic interceptor handling is implemented in <code>reitit.interceptor</code> package. There is no interceptor executor shipped, but you can use libraries like <a href="https://github.com/pedestal/pedestal/tree/master/interceptor" target="_blank">Pedestal Interceptor</a> or <a href="https://github.com/metosin/sieppari" target="_blank">Sieppari</a> to execute the chains.</p>
<h2 id="reitit-http">Reitit-http</h2>
<p>An alternative to <code>reitit-ring</code>, using interceptors instead of middleware. Currently not finalized, you can track progress in <a href="https://github.com/metosin/reitit/pull/124" target="_blank">here</a>.</p>
<h2 id="examples">Examples</h2>
<h3 id="standalone">Standalone</h3>
<ul>
<li><a href="https://github.com/metosin/sieppari" target="_blank">Sieppari</a> for executing the chain</li>
<li><a href="https://github.com/ztellman/manifold" target="_blank">Manifold</a> for async</li>
<li><a href="https://github.com/metosin/spec-tools/blob/master/README.md#data-specs" target="_blank">data-specs</a> for coercion</li>
</ul>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.interceptor.sieppari <span class="hljs-symbol">:as</span> sieppari])
(<span class="hljs-name">require</span> &apos;[reitit.http.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.http <span class="hljs-symbol">:as</span> http])
(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec])
(<span class="hljs-name">require</span> &apos;[clojure.set <span class="hljs-symbol">:as</span> set])
(<span class="hljs-name">require</span> &apos;[manifold.deferred <span class="hljs-symbol">:as</span> d])
(<span class="hljs-name">require</span> &apos;[ring.adapter.jetty <span class="hljs-symbol">:as</span> jetty])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> auth-interceptor
<span class="hljs-string">&quot;Interceptor that mounts itself if route has `:roles` data. Expects `:roles`
to be a set of keyword and the context to have `[:user :roles]` with user roles.
responds with HTTP 403 if user doesn&apos;t have the roles defined, otherwise no-op.&quot;</span>
{<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::auth</span>
<span class="hljs-symbol">:compile</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{<span class="hljs-symbol">:keys</span> [roles]} _]
(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">seq</span></span> roles)
{<span class="hljs-symbol">:description</span> (<span class="hljs-name"><span class="hljs-builtin-name">str</span></span> <span class="hljs-string">&quot;requires roles &quot;</span> roles)
<span class="hljs-symbol">:spec</span> {<span class="hljs-symbol">:roles</span> #{keyword?}}
<span class="hljs-symbol">:context-spec</span> {<span class="hljs-symbol">:user</span> {<span class="hljs-symbol">:roles</span> #{keyword}}}
<span class="hljs-symbol">:enter</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{user-roles <span class="hljs-symbol">:roles</span>} <span class="hljs-symbol">:user</span> <span class="hljs-symbol">:as</span> ctx}]
(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">not</span></span> (<span class="hljs-name">set/subset?</span> roles user-roles))
(<span class="hljs-name"><span class="hljs-builtin-name">assoc</span></span> ctx <span class="hljs-symbol">:response</span> {<span class="hljs-symbol">:status</span> <span class="hljs-number">403</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;forbidden&quot;</span>})
ctx))}))})
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> async-interceptor
{<span class="hljs-symbol">:enter</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [ctx] (<span class="hljs-name">d/future</span> ctx))})
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">http/ring-handler</span>
(<span class="hljs-name">http/router</span>
[<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:interceptors</span> [async-interceptor auth-interceptor]}
[<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::ping</span>
<span class="hljs-symbol">:get</span> (<span class="hljs-name"><span class="hljs-builtin-name">constantly</span></span>
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;pong&quot;</span>})}]
[<span class="hljs-string">&quot;/plus/:z&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::plus</span>
<span class="hljs-symbol">:post</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:query</span> {<span class="hljs-symbol">:x</span> int?}
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:y</span> int?}
<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:z</span> int?}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> pos-int?}}}
<span class="hljs-symbol">:roles</span> #{<span class="hljs-symbol">:admin</span>}
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{<span class="hljs-symbol">:keys</span> [parameters]}]
(<span class="hljs-name"><span class="hljs-builtin-name">let</span></span> [total (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> parameters <span class="hljs-symbol">:query</span> <span class="hljs-symbol">:x</span>)
(<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> parameters <span class="hljs-symbol">:body</span> <span class="hljs-symbol">:y</span>)
(<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> parameters <span class="hljs-symbol">:path</span> <span class="hljs-symbol">:z</span>))]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> total}}))}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:coercion</span> reitit.coercion.spec/coercion
<span class="hljs-symbol">:interceptors</span> [coercion/coerce-exceptions-interceptor
coercion/coerce-request-interceptor
coercion/coerce-response-interceptor]}})
(<span class="hljs-name">ring/create-default-handler</span>)
{<span class="hljs-symbol">:executor</span> sieppari/executor}))
(<span class="hljs-name">jetty/run-jetty</span> #&apos;app {<span class="hljs-symbol">:port</span> <span class="hljs-number">3000</span>, <span class="hljs-symbol">:join?</span> <span class="hljs-literal">false</span>, <span class="hljs-symbol">:async?</span> <span class="hljs-literal">true</span>})
</code></pre>
<h3 id="pedestal">Pedestal</h3>
<p><strong>TODO</strong></p>
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# Middleware Records
Reitit supports first-class data-driven middleware via `reitit.middleware/Middleware` records, created with `reitit.middleware/create` function. The following keys have special purpose:
| key | description |
| -----------|-------------|
| `:name` | Name of the middleware as qualified keyword (optional,recommended for libs)
| `:wrap` | The actual middleware function of `handler args? => request => response`
| `:gen` | Middleware compile function, see [compiling middleware](#compiling-middleware).
When routes are compiled, all middleware are expanded (and optionally compiled) into `Middleware` and stored in compilation results for later use (api-docs etc). For actual request processing, they are unwrapped into normal middleware functions producing zero runtime performance penalty. Middleware expansion is backed by `reitit.middleware/IntoMiddleware` protocol, enabling plain clojure(script) maps to be used.
A Record:
```clj
(require '[reitit.middleware :as middleware])
(def wrap2
(middleware/create
{:name ::wrap2
:description "a nice little mw, takes 1 arg."
:wrap wrap}))
```
As plain map:
```clj
;; plain map
(def wrap3
{:name ::wrap3
:description "a nice little mw, :api as arg"
:wrap (fn [handler]
(wrap handler :api))})
```

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<h1 id="swagger--openapi-wip">Swagger &amp; OpenAPI (WIP)</h1>
<p>Goal is to support both <a href="https://swagger.io/" target="_blank">Swagger</a> &amp; <a href="https://www.openapis.org/" target="_blank">OpenAPI</a> for route documentation. Documentation is extracted from existing coercion definitions <code>:parameters</code>, <code>:responses</code> and from a set of new doumentation keys.</p>
<p>Swagger-support draft works, but only for Clojure.</p>
<h3 id="todo">TODO</h3>
<ul>
<li><a href="https://github.com/metosin/schema-tools/issues/38" target="_blank">metosin/schema-tools#38</a>: extract Schema-swagger from <a href="https://github.com/metosin/ring-swagger" target="_blank">ring-swagger</a> into <a href="https://github.com/metosin/schema-tools" target="_blank">schema-tools</a> to support both Clojure &amp; ClojureScript</li>
<li>separate modules for the swagger2 &amp; openapi</li>
<li><a href="https://github.com/metosin/spec-tools/issues/105" target="_blank">metosin/spec-tools#105</a>: support Openapi</li>
</ul>
<h3 id="example">Example</h3>
<p>Current <code>reitit-swagger</code> draft (with <code>reitit-ring</code> &amp; data-specs):</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.ring.swagger <span class="hljs-symbol">:as</span> swagger])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion <span class="hljs-symbol">:as</span> rrc])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
<span class="hljs-comment">;; identify a swagger api</span>
<span class="hljs-comment">;; there can be several in a routing tree</span>
{<span class="hljs-symbol">:swagger</span> {<span class="hljs-symbol">:id</span> <span class="hljs-symbol">:math</span>}}
<span class="hljs-comment">;; the (undocumented) swagger spec endpoint</span>
[<span class="hljs-string">&quot;/swagger.json&quot;</span>
{<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:no-doc</span> <span class="hljs-literal">true</span>
<span class="hljs-symbol">:swagger</span> {<span class="hljs-symbol">:info</span> {<span class="hljs-symbol">:title</span> <span class="hljs-string">&quot;my-api&quot;</span>}}
<span class="hljs-symbol">:handler</span> swagger/swagger-spec-handler}}]
[<span class="hljs-string">&quot;/minus&quot;</span>
{<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:summary</span> <span class="hljs-string">&quot;minus&quot;</span>
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:query</span> {<span class="hljs-symbol">:x</span> int?, <span class="hljs-symbol">:y</span> int?}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> int?}}}
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:query</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">-</span></span> x y)}})}}]
[<span class="hljs-string">&quot;/plus&quot;</span>
{<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:summary</span> <span class="hljs-string">&quot;plus&quot;</span>
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:query</span> {<span class="hljs-symbol">:x</span> int?, <span class="hljs-symbol">:y</span> int?}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> int?}}}
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:query</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-comment">;; does not particiate in request processing</span>
<span class="hljs-comment">;; just defines specs for the extra keys</span>
swagger/swagger-middleware
rrc/coerce-exceptions-middleware
rrc/coerce-request-middleware
rrc/coerce-response-middleware]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
</code></pre>
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<h1 id="parameter-coercion">Parameter coercion</h1>
<p>Reitit provides pluggable parameter coercion via <code>reitit.coercion.protocol/Coercion</code> protocol, originally introduced in <a href="https://clojars.org/metosin/compojure-api" target="_blank">compojure-api</a>. Reitit ships with <code>reitit.coercion.spec/SpecCoercion</code> providing implemenation for <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a> and <a href="https://github.com/metosin/spec-tools#data-specs" target="_blank">data-specs</a>.</p>
<p><strong>NOTE</strong>: Before Clojure 1.9.0 is shipped, to use the spec-coercion, one needs to add the following dependencies manually to the project:</p>
<pre><code class="lang-clj">[org.clojure/clojure <span class="hljs-string">&quot;1.9.0-alpha20&quot;</span>]
[org.clojure/spec.alpha <span class="hljs-string">&quot;0.1.123&quot;</span>]
[metosin/spec-tools <span class="hljs-string">&quot;0.3.3&quot;</span>]
</code></pre>
<h3 id="ring-request-and-response-coercion">Ring request and response coercion</h3>
<p>To use <code>Coercion</code> with Ring, one needs to do the following:</p>
<ol>
<li>Define parameters and responses as data into route meta-data, in format adopted from <a href="https://github.com/metosin/ring-swagger#more-complete-example" target="_blank">ring-swagger</a>:<ul>
<li><code>:parameters</code> map, with submaps for different parameters: <code>:query</code>, <code>:body</code>, <code>:form</code>, <code>:header</code> and <code>:path</code>. Parameters are defined in the format understood by the <code>Coercion</code>.</li>
<li><code>:responses</code> map, with response status codes as keys (or <code>:default</code> for &quot;everything else&quot;) with maps with <code>:schema</code> and optionally <code>:description</code> as values.</li>
</ul>
</li>
<li>Define a <code>Coercion</code> to route meta-data under <code>:coercion</code></li>
<li>Mount request &amp; response coercion middleware to the routes.</li>
</ol>
<p>If the request coercion succeeds, the coerced parameters are injected into request under <code>:parameters</code>.</p>
<p>If either request or response coercion fails, an descriptive error is thrown.</p>
<h4 id="example-with-data-specs">Example with data-specs</h4>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:x</span> int?, <span class="hljs-symbol">:y</span> int?}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:schema</span> {<span class="hljs-symbol">:total</span> pos-int?}}}
<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:body</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:meta</span> {<span class="hljs-symbol">:middleware</span> [coercion/gen-wrap-coerce-parameters
coercion/gen-wrap-coerce-response]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
</code></pre>
<pre><code class="lang-clj">(<span class="hljs-name">app</span>
{<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>
<span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>
<span class="hljs-symbol">:body-params</span> {<span class="hljs-symbol">:x</span> <span class="hljs-number">1</span>, <span class="hljs-symbol">:y</span> <span class="hljs-number">2</span>}})
<span class="hljs-comment">; {:status 200, :body {:total 3}}</span>
</code></pre>
<h4 id="example-with-specs">Example with specs</h4>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name">require</span> &apos;[clojure.spec.alpha <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[spec-tools.core <span class="hljs-symbol">:as</span> st])
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::x</span> (<span class="hljs-name">st/spec</span> int?))
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::y</span> (<span class="hljs-name">st/spec</span> int?))
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::total</span> int?)
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::request</span> (<span class="hljs-name">s/keys</span> <span class="hljs-symbol">:req-un</span> [<span class="hljs-symbol">::x</span> <span class="hljs-symbol">::y</span>]))
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::response</span> (<span class="hljs-name">s/keys</span> <span class="hljs-symbol">:req-un</span> [<span class="hljs-symbol">::total</span>]))
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:body</span> <span class="hljs-symbol">::request</span>}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:schema</span> <span class="hljs-symbol">::response</span>}}
<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:body</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:meta</span> {<span class="hljs-symbol">:middleware</span> [coercion/gen-wrap-coerce-parameters
coercion/gen-wrap-coerce-response]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
</code></pre>
<pre><code class="lang-clj">(<span class="hljs-name">app</span>
{<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>
<span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>
<span class="hljs-symbol">:body-params</span> {<span class="hljs-symbol">:x</span> <span class="hljs-number">1</span>, <span class="hljs-symbol">:y</span> <span class="hljs-number">2</span>}})
<span class="hljs-comment">; {:status 200, :body {:total 3}}</span>
</code></pre>
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<h1 id="shared-routes">Shared routes</h1>
<p>As <code>reitit-core</code> works with both Clojure &amp; ClojureScript, one can have a shared routing table for both the frontend and the backend application, using the <a href="https://clojure.org/guides/reader_conditionals" target="_blank">Clujore Common Files</a>.</p>
<p>For backend, you need to define a <code>:handler</code> for the request processing, for fronend, <code>:name</code> enables the use of <a href="../basics/name_based_routing.html">reverse routing</a>.</p>
<p>There are multiple options to use shared routing table.</p>
<h2 id="using-reader-conditionals">Using reader conditionals</h2>
<pre><code class="lang-clj">;; define the handlers for for clojure
#?(:clj (declare get-kikka))
#?(:clj (declare post-kikka))
;; :name for both, :handler just for clojure
(def routes
[&quot;/kikka&quot;
{:name ::kikka
:get #?(:clj {:handler get-kikka})
:post #?(:clj {:handler post-kikka})}]
</code></pre>
<h2 id="using-custom-expander">Using custom expander</h2>
<p>raw-routes can have any non-sequential data as a route argument, which gets expanded using the <code>:expand</code> option given to the <code>reitit.core.router</code> function. It defaults to <code>reitit.core/expand</code> multimethod.</p>
<p>First, define the common routes (in a <code>.cljc</code> file):</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
[[<span class="hljs-string">&quot;/kikka&quot;</span> <span class="hljs-symbol">::kikka</span>]
[<span class="hljs-string">&quot;/bar&quot;</span> <span class="hljs-symbol">::bar</span>]])
</code></pre>
<p>Those can be used as-is from ClojureScript:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span> routes))
(<span class="hljs-name">r/match-by-name</span> router <span class="hljs-symbol">::kikka</span>)
<span class="hljs-comment">;#Match{:template &quot;/kikka&quot;</span>
<span class="hljs-comment">; :data {:name :user/kikka}</span>
<span class="hljs-comment">; :result nil</span>
<span class="hljs-comment">; :path-params nil</span>
<span class="hljs-comment">; :path &quot;/kikka&quot;}</span>
</code></pre>
<p>For the backend, we can use a custom-expander to expand the routes:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> my-expand [registry]
(<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [data opts]
(<span class="hljs-name"><span class="hljs-builtin-name">or</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> (<span class="hljs-name"><span class="hljs-builtin-name">keyword?</span></span> data)
(<span class="hljs-name">some-&gt;</span> data
registry
(<span class="hljs-name">r/expand</span> opts)
(<span class="hljs-name"><span class="hljs-builtin-name">assoc</span></span> <span class="hljs-symbol">:name</span> data)))
(<span class="hljs-name">r/expand</span> data opts))))
<span class="hljs-comment">;; the handler functions</span>
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> get-kikka [_] {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;get&quot;</span>})
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> post-kikka [_] {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;post&quot;</span>})
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> bar [_] {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;bar&quot;</span>})
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[[<span class="hljs-string">&quot;/kikka&quot;</span> <span class="hljs-symbol">::kikka</span>]
[<span class="hljs-string">&quot;/bar&quot;</span> <span class="hljs-symbol">::bar</span>]]
<span class="hljs-comment">;; use a custom expander</span>
{<span class="hljs-symbol">:expand</span> (<span class="hljs-name">my-expand</span>
{<span class="hljs-symbol">::kikka</span> {<span class="hljs-symbol">:get</span> get-kikka
<span class="hljs-symbol">:post</span> post-kikka}
<span class="hljs-symbol">::bar</span> bar})})))
(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:post</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/kikka&quot;</span>})
<span class="hljs-comment">; {:status 200, :body &quot;post&quot;}</span>
</code></pre>
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<h1 id="ring-router">Ring Router</h1>
<p><a href="https://github.com/ring-clojure/ring" target="_blank">Ring</a>-router adds support for <a href="https://github.com/ring-clojure/ring/wiki/Concepts#handlers" target="_blank">handlers</a>, <a href="https://github.com/ring-clojure/ring/wiki/Concepts#middleware" target="_blank">middleware</a> and routing based on <code>:request-method</code>. Ring-router is created with <code>reitit.ring/router</code> function. It runs a custom route compiler, creating a optimized stucture for handling route matches, with compiled middleware chain &amp; handlers for all request methods. It also ensures that all routes have a <code>:handler</code> defined.</p>
<p>Simple Ring app:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> handler [_]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;ok&quot;</span>})
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/ping&quot;</span> handler])))
</code></pre>
<p>Applying the handler:</p>
<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/favicon.ico&quot;</span>})
<span class="hljs-comment">; nil</span>
(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/ping&quot;</span>})
<span class="hljs-comment">; {:status 200, :body &quot;ok&quot;}</span>
</code></pre>
<p>The expanded routes:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> app (<span class="hljs-name">ring/get-router</span>) (<span class="hljs-name">reitit/routes</span>))
<span class="hljs-comment">; [[&quot;/ping&quot;</span>
<span class="hljs-comment">; {:handler #object[...]}</span>
<span class="hljs-comment">; #Methods{:any #Endpoint{:meta {:handler #object[...]},</span>
<span class="hljs-comment">; :handler #object[...],</span>
<span class="hljs-comment">; :middleware []}}]]</span>
</code></pre>
<p>Note that the compiled resuts as third element in the route vector.</p>
<h1 id="request-method-based-routing">Request-method based routing</h1>
<p>Handler are also looked under request-method keys: <code>:get</code>, <code>:head</code>, <code>:patch</code>, <code>:delete</code>, <code>:options</code>, <code>:post</code> or <code>:put</code>. Top-level handler is used if request-method based handler is not found.</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::ping</span>
<span class="hljs-symbol">:get</span> handler
<span class="hljs-symbol">:post</span> handler}])))
(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/ping&quot;</span>})
<span class="hljs-comment">; {:status 200, :body &quot;ok&quot;}</span>
(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:put</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/ping&quot;</span>})
<span class="hljs-comment">; nil</span>
</code></pre>
<p>Reverse routing:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> app
(<span class="hljs-name">ring/get-router</span>)
(<span class="hljs-name">reitit/match-by-name</span> <span class="hljs-symbol">::ping</span>)
<span class="hljs-symbol">:path</span>)
<span class="hljs-comment">; &quot;/ping&quot;</span>
</code></pre>
<h1 id="middleware">Middleware</h1>
<p>Middleware can be added with a <code>:middleware</code> key, with a vector value of the following:</p>
<ol>
<li>ring middleware function <code>handler -&gt; request -&gt; response</code></li>
<li>vector of middleware function <code>handler ?args -&gt; request -&gt; response</code> and optinally it&apos;s args.</li>
</ol>
<p>A middleware and a handler:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> wrap [handler id]
(<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [request]
(<span class="hljs-name">handler</span> (<span class="hljs-name">update</span> request <span class="hljs-symbol">::acc</span> (<span class="hljs-name">fnil</span> conj []) id))))
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> handler [{<span class="hljs-symbol">:keys</span> [<span class="hljs-symbol">::acc</span>]}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> (<span class="hljs-name"><span class="hljs-builtin-name">conj</span></span> acc <span class="hljs-symbol">:handler</span>)})
</code></pre>
<p>App with nested middleware:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:middleware</span> [#(<span class="hljs-name">wrap</span> % <span class="hljs-symbol">:api</span>)]}
[<span class="hljs-string">&quot;/ping&quot;</span> handler]
[<span class="hljs-string">&quot;/admin&quot;</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-symbol">:admin</span>]]}
[<span class="hljs-string">&quot;/db&quot;</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-symbol">:db</span>]]
<span class="hljs-symbol">:delete</span> {<span class="hljs-symbol">:middleware</span> [#(<span class="hljs-name">wrap</span> % <span class="hljs-symbol">:delete</span>)]
<span class="hljs-symbol">:handler</span> handler}}]]])))
</code></pre>
<p>Middleware is applied correctly:</p>
<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:delete</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
<span class="hljs-comment">; {:status 200, :body [:api :handler]}</span>
</code></pre>
<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:delete</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/admin/db&quot;</span>})
<span class="hljs-comment">; {:status 200, :body [:api :admin :db :delete :handler]}</span>
</code></pre>
<h1 id="async-ring">Async Ring</h1>
<p>All built-in middleware provide both 2 and 3-arity and are compiled for both Clojure &amp; ClojureScript, so they work with <a href="https://www.booleanknot.com/blog/2016/07/15/asynchronous-ring.html" target="_blank">Async Ring</a> and <a href="https://nodejs.org" target="_blank">Node.js</a> too.</p>
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# RESTful form methods
When designing RESTful applications you will be doing a lot of "PATCH" and "DELETE" request, but most browsers don't support methods other than "GET" and "POST" when it comes to submitting forms.
There is a pattern to solve this (pioneered by Rails) using a hidden "_method" field in the form and swapping out the "POST" method for whatever is in that field.
We can do this with middleware in reitit like this:
```clj
(defn- hidden-method
[request]
(keyword
(or (get-in request [:form-params "_method"]) ;; look for "_method" field in :form-params
(get-in request [:multipart-params "_method"])))) ;; or in :multipart-params
(def wrap-hidden-method
{:name ::wrap-hidden-method
:wrap (fn [handler]
(fn [request]
(if-let [fm (and (= :post (:request-method request)) ;; if this is a :post request
(hidden-method request))] ;; and there is a "_method" field
(handler (assoc request :request-method fm)) ;; replace :request-method
(handler request))))})
```
And apply the middleware like this:
```clj
(reitit.ring/ring-handler
(reitit.ring/router ...)
(reitit.ring/create-default-handler)
{:middleware
[reitit.ring.middleware.parameters/parameters-middleware ;; needed to have :form-params in the request map
reitit.ring.middleware.multipart/multipart-middleware ;; needed to have :multipart-params in the request map
wrap-hidden-method]}) ;; our hidden method wrapper
```
(NOTE: This middleware must be placed here and not inside the route data given to `reitit.ring/handler`.
This is so that our middleware is applied before reitit matches the request with a spesific handler using the wrong method.)

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# Exception Handling with Ring
```clj
[metosin/reitit-middleware "0.4.2"]
```
Exceptions thrown in router creation can be [handled with custom exception handler](../basics/error_messages.md). By default, exceptions thrown at runtime from a handler or a middleware are not caught by the `reitit.ring/ring-handler`. A good practise is a have an top-level exception handler to log and format the errors for clients.
```clj
(require '[reitit.ring.middleware.exception :as exception])
```
### `exception/exception-middleware`
A preconfigured middleware using `exception/default-handlers`. Catches:
* Request & response [Coercion](coercion.md) exceptions
* [Muuntaja](https://github.com/metosin/muuntaja) decode exceptions
* Exceptions with `:type` of `:reitit.ring/response`, returning `:response` key from `ex-data`.
* Safely all other exceptions
```clj
(require '[reitit.ring :as ring])
(def app
(ring/ring-handler
(ring/router
["/fail" (fn [_] (throw (Exception. "fail")))]
{:data {:middleware [exception/exception-middleware]}})))
(app {:request-method :get, :uri "/fail"})
;{:status 500
; :body {:type "exception"
; :class "java.lang.Exception"}}
```
### `exception/create-exception-middleware`
Creates the exception-middleware with custom options. Takes a map of `identifier => exception request => response` that is used to select the exception handler for the thrown/raised exception identifier. Exception identifier is either a `Keyword` or a Exception Class.
The following handlers are available by default:
| key | description
|--------------------------------------|-------------
| `:reitit.ring/response` | value in ex-data key `:response` will be returned
| `:muuntaja/decode` | handle Muuntaja decoding exceptions
| `:reitit.coercion/request-coercion` | request coercion errors (http 400 response)
| `:reitit.coercion/response-coercion` | response coercion errors (http 500 response)
| `::exception/default` | a default exception handler if nothing else matched (default `exception/default-handler`).
| `::exception/wrap` | a 3-arity handler to wrap the actual handler `handler exception request => response` (no default).
The handler is selected from the options map by exception identifier in the following lookup order:
1) `:type` of exception ex-data
2) Class of exception
3) `:type` ancestors of exception ex-data
4) Super Classes of exception
5) The ::default handler
```clj
;; type hierarchy
(derive ::error ::exception)
(derive ::failure ::exception)
(derive ::horror ::exception)
(defn handler [message exception request]
{:status 500
:body {:message message
:exception (.getClass exception)
:data (ex-data exception)
:uri (:uri request)}})
(def exception-middleware
(exception/create-exception-middleware
(merge
exception/default-handlers
{;; ex-data with :type ::error
::error (partial handler "error")
;; ex-data with ::exception or ::failure
::exception (partial handler "exception")
;; SQLException and all it's child classes
java.sql.SQLException (partial handler "sql-exception")
;; override the default handler
::exception/default (partial handler "default")
;; print stack-traces for all exceptions
::exception/wrap (fn [handler e request]
(println "ERROR" (pr-str (:uri request)))
(handler e request))})))
(def app
(ring/ring-handler
(ring/router
["/fail" (fn [_] (throw (ex-info "fail" {:type ::failue})))]
{:data {:middleware [exception-middleware]}})))
(app {:request-method :get, :uri "/fail"})
; ERROR "/fail"
; => {:status 500,
; :body {:message "default"
; :exception clojure.lang.ExceptionInfo
; :data {:type :user/failue}
; :uri "/fail"}}
```

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<h1 id="parameter-coercion">Parameter coercion</h1>
<p>Reitit provides pluggable parameter coercion via <code>reitit.ring.coercion.protocol/Coercion</code> protocol, originally introduced in <a href="https://clojars.org/metosin/compojure-api" target="_blank">compojure-api</a>. Reitit ships with <code>reitit.ring.coercion.spec/SpecCoercion</code> providing implemenation for <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a> and <a href="https://github.com/metosin/spec-tools#data-specs" target="_blank">data-specs</a>.</p>
<p><strong>NOTE</strong>: Before Clojure 1.9.0 is shipped, to use the spec-coercion, one needs to add the following dependencies manually to the project:</p>
<pre><code class="lang-clj">[org.clojure/clojure <span class="hljs-string">&quot;1.9.0-beta2&quot;</span>]
[org.clojure/spec.alpha <span class="hljs-string">&quot;0.1.123&quot;</span>]
[metosin/spec-tools <span class="hljs-string">&quot;0.4.0&quot;</span>]
</code></pre>
<h3 id="ring-request-and-response-coercion">Ring request and response coercion</h3>
<p>To use <code>Coercion</code> with Ring, one needs to do the following:</p>
<ol>
<li>Define parameters and responses as data into route data, in format adopted from <a href="https://github.com/metosin/ring-swagger#more-complete-example" target="_blank">ring-swagger</a>:<ul>
<li><code>:parameters</code> map, with submaps for different parameters: <code>:query</code>, <code>:body</code>, <code>:form</code>, <code>:header</code> and <code>:path</code>. Parameters are defined in the format understood by the <code>Coercion</code>.</li>
<li><code>:responses</code> map, with response status codes as keys (or <code>:default</code> for &quot;everything else&quot;) with maps with <code>:schema</code> and optionally <code>:description</code> as values.</li>
</ul>
</li>
<li>Define a <code>Coercion</code> to route data under <code>:coercion</code></li>
<li>Mount request &amp; response coercion middleware to the routes (recommended to mount to all routes under router as they mounted only to routes which have the parameters / responses defined):<ul>
<li><code>reitit.ring.coercion/gen-wrap-coerce-parameters</code></li>
<li><code>gen-wrap-coerce-parameters/gen-wrap-coerce-responses</code></li>
</ul>
</li>
</ol>
<p>If the request coercion succeeds, the coerced parameters are injected into request under <code>:parameters</code>.</p>
<p>If either request or response coercion fails, an descriptive error is thrown.</p>
<h4 id="example-with-data-specs">Example with data-specs</h4>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:x</span> int?, <span class="hljs-symbol">:y</span> int?}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:schema</span> {<span class="hljs-symbol">:total</span> pos-int?}}}
<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:body</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion/gen-wrap-coerce-parameters
coercion/gen-wrap-coerce-response]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
</code></pre>
<pre><code class="lang-clj">(<span class="hljs-name">app</span>
{<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>
<span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>
<span class="hljs-symbol">:body-params</span> {<span class="hljs-symbol">:x</span> <span class="hljs-number">1</span>, <span class="hljs-symbol">:y</span> <span class="hljs-number">2</span>}})
<span class="hljs-comment">; {:status 200, :body {:total 3}}</span>
</code></pre>
<h4 id="example-with-specs">Example with specs</h4>
<p>Currently, <code>clojure.spec</code> <a href="https://dev.clojure.org/jira/browse/CLJ-2116" target="_blank">doesn&apos;t support runtime transformations via conforming</a>, so one needs to wrap all specs with <code>spec-tools.core/spec</code>.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name">require</span> &apos;[clojure.spec.alpha <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[spec-tools.core <span class="hljs-symbol">:as</span> st])
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::x</span> (<span class="hljs-name">st/spec</span> int?))
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::y</span> (<span class="hljs-name">st/spec</span> int?))
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::total</span> int?)
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::request</span> (<span class="hljs-name">s/keys</span> <span class="hljs-symbol">:req-un</span> [<span class="hljs-symbol">::x</span> <span class="hljs-symbol">::y</span>]))
(<span class="hljs-name">s/def</span> <span class="hljs-symbol">::response</span> (<span class="hljs-name">s/keys</span> <span class="hljs-symbol">:req-un</span> [<span class="hljs-symbol">::total</span>]))
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:body</span> <span class="hljs-symbol">::request</span>}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:schema</span> <span class="hljs-symbol">::response</span>}}
<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:body</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [coercion/gen-wrap-coerce-parameters
coercion/gen-wrap-coerce-response]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
</code></pre>
<pre><code class="lang-clj">(<span class="hljs-name">app</span>
{<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>
<span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>
<span class="hljs-symbol">:body-params</span> {<span class="hljs-symbol">:x</span> <span class="hljs-number">1</span>, <span class="hljs-symbol">:y</span> <span class="hljs-number">2</span>}})
<span class="hljs-comment">; {:status 200, :body {:total 3}}</span>
</code></pre>
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@ -1,64 +0,0 @@
# Slash handler
The router works with precise matches. If a route is defined without a trailing slash, for example, it won't match a request with a slash.
```clj
(require '[reitit.ring :as ring])
(def app
(ring/ring-handler
(ring/router
["/ping" (constantly {:status 200, :body ""})])))
(app {:uri "/ping/"})
; nil
```
Sometimes it is desirable that paths with and without a trailing slash are recognized as the same.
Setting the `redirect-trailing-slash-handler` as a second argument to `ring-handler`:
```clj
(def app
(ring/ring-handler
(ring/router
[["/ping" (constantly {:status 200, :body ""})]
["/pong/" (constantly {:status 200, :body ""})]])
(ring/redirect-trailing-slash-handler)))
(app {:uri "/ping/"})
; {:status 308, :headers {"Location" "/ping"}, :body ""}
(app {:uri "/pong"})
; {:status 308, :headers {"Location" "/pong/"}, :body ""}
```
`redirect-trailing-slash-handler` accepts an optional `:method` parameter that allows configuring how (whether) to handle missing/extra slashes. The default is to handle both.
```clj
(def app
(ring/ring-handler
(ring/router
[["/ping" (constantly {:status 200, :body ""})]
["/pong/" (constantly {:status 200, :body ""})]])
; only handle extra trailing slash
(ring/redirect-trailing-slash-handler {:method :strip})))
(app {:uri "/ping/"})
; {:status 308, :headers {"Location" "/ping"}, :body ""}
(app {:uri "/pong"})
; nil
```
```clj
(def app
(ring/ring-handler
(ring/router
[["/ping" (constantly {:status 200, :body ""})]
["/pong/" (constantly {:status 200, :body ""})]])
; only handle missing trailing slash
(ring/redirect-trailing-slash-handler {:method :add})))
(app {:uri "/ping/"})
; nil
(app {:uri "/pong"})
; {:status 308, :headers {"Location" "/pong/"}, :body ""}
```

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@ -917,7 +917,7 @@
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@ -1141,7 +1141,7 @@ see the next example</li>
<script>
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# Transformation Middleware Chain
There is an extra option in ring-router (actually, in the underlying middleware-router): `:reitit.middleware/transform` to transform the middleware chain per endpoint. It gets the vector of compiled middleware and should return a new vector of middleware.
## Adding debug middleware between all other middleware
```clj
(def app
(ring/ring-handler
(ring/router
["/api" {:middleware [[wrap 1] [wrap2 2]]}
["/ping" {:get {:middleware [[wrap3 3]]
:handler handler}}]]
{::middleware/transform #(interleave % (repeat [wrap :debug]))})))
```
```clj
(app {:request-method :get, :uri "/api/ping"})
; {:status 200, :body [1 :debug 2 :debug 3 :debug :handler]}
```
## Reversing the middleware chain
```clj
(def app
(ring/ring-handler
(ring/router
["/api" {:middleware [[wrap 1] [wrap2 2]]}
["/ping" {:get {:middleware [[wrap3 3]]
:handler handler}}]]
{::middleware/transform reverse)})))
```
```clj
(app {:request-method :get, :uri "/api/ping"})
; {:status 200, :body [3 2 1 :handler]}
```

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<h1 id="route-conflicts">Route conflicts</h1>
<p>Many routing libraries allow single path lookup could match multiple routes. Usually, first match is used. This is not good, especially if route tree is merged from multiple sources - routes might regress to be unreachable without a warning.</p>
<p>Reitit resolves this by running explicit conflicit resolution when a <code>Router</code> is created. Conflicting routes are passed into a <code>:conflicts</code> callback. Default implementation throws <code>ex-info</code> with a descriptive message.</p>
<p>Examples routes with conflicts:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> reitit])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
[[<span class="hljs-string">&quot;/ping&quot;</span>]
[<span class="hljs-string">&quot;/:user-id/orders&quot;</span>]
[<span class="hljs-string">&quot;/bulk/:bulk-id&quot;</span>]
[<span class="hljs-string">&quot;/public/*path&quot;</span>]
[<span class="hljs-string">&quot;/:version/status&quot;</span>]])
</code></pre>
<p>By default, <code>ExceptionInfo</code> is thrown:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/router</span> routes)
<span class="hljs-comment">; CompilerException clojure.lang.ExceptionInfo: Router contains conflicting routes:</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /:user-id/orders</span>
<span class="hljs-comment">; -&gt; /public/*path</span>
<span class="hljs-comment">; -&gt; /bulk/:bulk-id</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /bulk/:bulk-id</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /public/*path</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
</code></pre>
<p>Just logging the conflicts:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/router</span>
routes
{<span class="hljs-symbol">:conflicts</span> (<span class="hljs-name"><span class="hljs-builtin-name">comp</span></span> println reitit/conflicts-str)})
<span class="hljs-comment">; Router contains conflicting routes:</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /:user-id/orders</span>
<span class="hljs-comment">; -&gt; /public/*path</span>
<span class="hljs-comment">; -&gt; /bulk/:bulk-id</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /bulk/:bulk-id</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /public/*path</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
</code></pre>
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<h1 id="route-validation">Route validation</h1>
<p>Namespace <code>reitit.spec</code> contains <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a> definitions for raw-routes, routes, router and router options.</p>
<p><strong>NOTE:</strong> Use of specs requires to use one of the following:</p>
<ul>
<li><code>[org.clojure/clojurescript &quot;1.9.660&quot;]</code></li>
<li><code>[org.clojure/clojure &quot;1.9.0-alpha19&quot;]</code></li>
<li><code>[clojure-future-spec &quot;1.9.0-alpha17&quot;]</code> (Clojure 1.8)</li>
</ul>
<h2 id="at-runtime">At runtime</h2>
<p>If route trees are generated at runtime (e.g. from external source like the database), one can use directly the <code>clojure.spec</code> functions.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[clojure.spec.alpha <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[reitit.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes-from-db
[<span class="hljs-string">&quot;tenant1&quot;</span> <span class="hljs-symbol">::tenant1</span>])
(<span class="hljs-name">s/valid?</span> <span class="hljs-symbol">::spec/raw-routes</span> routes-from-db)
<span class="hljs-comment">; false</span>
(<span class="hljs-name">s/explain</span> <span class="hljs-symbol">::spec/raw-routes</span> routes-from-db)
<span class="hljs-comment">; In: [0] val: &quot;tenant1&quot; fails spec: :reitit.spec/path at: [:route :path] predicate: (or (blank? %) (starts-with? % &quot;/&quot;))</span>
<span class="hljs-comment">; In: [0] val: &quot;tenant1&quot; fails spec: :reitit.spec/raw-route at: [:routes] predicate: (cat :path :reitit.spec/path :arg (? :reitit.spec/arg) :childs (* (and (nilable :reitit.spec/raw-route))))</span>
<span class="hljs-comment">; In: [1] val: :user/tenant1 fails spec: :reitit.spec/raw-route at: [:routes] predicate: (cat :path :reitit.spec/path :arg (? :reitit.spec/arg) :childs (* (and (nilable :reitit.spec/raw-route))))</span>
<span class="hljs-comment">; :clojure.spec.alpha/spec :reitit.spec/raw-routes</span>
<span class="hljs-comment">; :clojure.spec.alpha/value [&quot;tenant1&quot; :user/tenant1]</span>
</code></pre>
<h2 id="at-development-time">At development time</h2>
<p><code>reitit.core/router</code> can be instrumented and use something like <a href="https://github.com/bhb/expound" target="_blank">expound</a> to pretty-print the spec problems.</p>
<p>First add a <code>:dev</code> dependency to:</p>
<pre><code class="lang-clj">[expound <span class="hljs-string">&quot;0.3.0&quot;</span>]
</code></pre>
<p>Some bootstrapping:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[clojure.spec.test.alpha <span class="hljs-symbol">:as</span> stest])
(<span class="hljs-name">require</span> &apos;[expound.alpha <span class="hljs-symbol">:as</span> expound])
(<span class="hljs-name">require</span> &apos;[clojure.spec.alpha <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[reitit.spec])
(<span class="hljs-name">stest/instrument</span> `reitit/router)
(<span class="hljs-name"><span class="hljs-builtin-name">set!</span></span> s/*explain-out* expound/printer)
</code></pre>
<p>And we are ready to go:</p>
<pre><code class="lang-clj">
(<span class="hljs-name">reitit/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/public&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span>]
[<span class="hljs-string">&quot;pong&quot;</span>]]])
<span class="hljs-comment">; CompilerException clojure.lang.ExceptionInfo: Call to #&apos;reitit.core/router did not conform to spec:</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -- Spec failed --------------------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; Function arguments</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; ([&quot;/api&quot; ...])</span>
<span class="hljs-comment">; ^^^^^^</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; should satisfy</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; (clojure.spec.alpha/cat</span>
<span class="hljs-comment">; :path</span>
<span class="hljs-comment">; :reitit.spec/path</span>
<span class="hljs-comment">; :arg</span>
<span class="hljs-comment">; (clojure.spec.alpha/? :reitit.spec/arg)</span>
<span class="hljs-comment">; :childs</span>
<span class="hljs-comment">; (clojure.spec.alpha/*</span>
<span class="hljs-comment">; (clojure.spec.alpha/and</span>
<span class="hljs-comment">; (clojure.spec.alpha/nilable :reitit.spec/raw-route))))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; or</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; (clojure.spec.alpha/cat</span>
<span class="hljs-comment">; :path</span>
<span class="hljs-comment">; :reitit.spec/path</span>
<span class="hljs-comment">; :arg</span>
<span class="hljs-comment">; (clojure.spec.alpha/? :reitit.spec/arg)</span>
<span class="hljs-comment">; :childs</span>
<span class="hljs-comment">; (clojure.spec.alpha/*</span>
<span class="hljs-comment">; (clojure.spec.alpha/and</span>
<span class="hljs-comment">; (clojure.spec.alpha/nilable :reitit.spec/raw-route))))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -- Relevant specs -------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; :reitit.spec/raw-route:</span>
<span class="hljs-comment">; (clojure.spec.alpha/cat</span>
<span class="hljs-comment">; :path</span>
<span class="hljs-comment">; :reitit.spec/path</span>
<span class="hljs-comment">; :arg</span>
<span class="hljs-comment">; (clojure.spec.alpha/? :reitit.spec/arg)</span>
<span class="hljs-comment">; :childs</span>
<span class="hljs-comment">; (clojure.spec.alpha/*</span>
<span class="hljs-comment">; (clojure.spec.alpha/and</span>
<span class="hljs-comment">; (clojure.spec.alpha/nilable :reitit.spec/raw-route))))</span>
<span class="hljs-comment">; :reitit.spec/raw-routes:</span>
<span class="hljs-comment">; (clojure.spec.alpha/or</span>
<span class="hljs-comment">; :route</span>
<span class="hljs-comment">; :reitit.spec/raw-route</span>
<span class="hljs-comment">; :routes</span>
<span class="hljs-comment">; (clojure.spec.alpha/coll-of :reitit.spec/raw-route :into []))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -- Spec failed --------------------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; Function arguments</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; ([... [... ... [&quot;pong&quot;]]])</span>
<span class="hljs-comment">; ^^^^^^</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; should satisfy</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; (fn</span>
<span class="hljs-comment">; [%]</span>
<span class="hljs-comment">; (or</span>
<span class="hljs-comment">; (clojure.string/blank? %)</span>
<span class="hljs-comment">; (clojure.string/starts-with? % &quot;/&quot;)))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; or</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; (fn</span>
<span class="hljs-comment">; [%]</span>
<span class="hljs-comment">; (or</span>
<span class="hljs-comment">; (clojure.string/blank? %)</span>
<span class="hljs-comment">; (clojure.string/starts-with? % &quot;/&quot;)))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -- Relevant specs -------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; :reitit.spec/path:</span>
<span class="hljs-comment">; (clojure.spec.alpha/and</span>
<span class="hljs-comment">; clojure.core/string?</span>
<span class="hljs-comment">; (clojure.core/fn</span>
<span class="hljs-comment">; [%]</span>
<span class="hljs-comment">; (clojure.core/or</span>
<span class="hljs-comment">; (clojure.string/blank? %)</span>
<span class="hljs-comment">; (clojure.string/starts-with? % &quot;/&quot;))))</span>
<span class="hljs-comment">; :reitit.spec/raw-route:</span>
<span class="hljs-comment">; (clojure.spec.alpha/cat</span>
<span class="hljs-comment">; :path</span>
<span class="hljs-comment">; :reitit.spec/path</span>
<span class="hljs-comment">; :arg</span>
<span class="hljs-comment">; (clojure.spec.alpha/? :reitit.spec/arg)</span>
<span class="hljs-comment">; :childs</span>
<span class="hljs-comment">; (clojure.spec.alpha/*</span>
<span class="hljs-comment">; (clojure.spec.alpha/and</span>
<span class="hljs-comment">; (clojure.spec.alpha/nilable :reitit.spec/raw-route))))</span>
<span class="hljs-comment">; :reitit.spec/raw-routes:</span>
<span class="hljs-comment">; (clojure.spec.alpha/or</span>
<span class="hljs-comment">; :route</span>
<span class="hljs-comment">; :reitit.spec/raw-route</span>
<span class="hljs-comment">; :routes</span>
<span class="hljs-comment">; (clojure.spec.alpha/coll-of :reitit.spec/raw-route :into []))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -------------------------</span>
<span class="hljs-comment">; Detected 2 errors</span>
</code></pre>
<h1 id="validating-route-data">Validating route data</h1>
<p><em>TODO</em></p>
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<h2 id="route-conflicts">Route conflicts</h2>
<p>Route trees should not have multiple routes that match to a single (request) path. <code>router</code> checks the route tree at creation for conflicts and calls a registered <code>:conflicts</code> option callback with the found conflicts. Default implementation throws <code>ex-info</code> with a descriptive message.</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/router</span>
[[<span class="hljs-string">&quot;/ping&quot;</span>]
[<span class="hljs-string">&quot;/:user-id/orders&quot;</span>]
[<span class="hljs-string">&quot;/bulk/:bulk-id&quot;</span>]
[<span class="hljs-string">&quot;/public/*path&quot;</span>]
[<span class="hljs-string">&quot;/:version/status&quot;</span>]])
<span class="hljs-comment">; CompilerException clojure.lang.ExceptionInfo: router contains conflicting routes:</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /:user-id/orders</span>
<span class="hljs-comment">; -&gt; /public/*path</span>
<span class="hljs-comment">; -&gt; /bulk/:bulk-id</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /bulk/:bulk-id</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; /public/*path</span>
<span class="hljs-comment">; -&gt; /:version/status</span>
<span class="hljs-comment">;</span>
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<h1 id="route-meta-data">Route meta-data</h1>
<p>Routes can have arbitrary meta-data. For nested routes, the meta-data is accumulated from root towards leafs using <a href="https://github.com/weavejester/meta-merge" target="_blank">meta-merge</a>.</p>
<p>A router based on nested route tree:</p>
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">reitit/router</span>
[<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::api</span>]}
[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/admin&quot;</span> {<span class="hljs-symbol">:roles</span> #{<span class="hljs-symbol">:admin</span>}}
[<span class="hljs-string">&quot;/users&quot;</span> <span class="hljs-symbol">::users</span>]
[<span class="hljs-string">&quot;/db&quot;</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::db</span>]
<span class="hljs-symbol">:roles</span> ^<span class="hljs-symbol">:replace</span> #{<span class="hljs-symbol">:db-admin</span>}}
[<span class="hljs-string">&quot;/:db&quot;</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:db</span> String}}
[<span class="hljs-string">&quot;/drop&quot;</span> <span class="hljs-symbol">::drop-db</span>]
[<span class="hljs-string">&quot;/stats&quot;</span> <span class="hljs-symbol">::db-stats</span>]]]]]))
</code></pre>
<p>Resolved route tree:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/routes</span> router)
<span class="hljs-comment">; [[&quot;/api/ping&quot; {:interceptors [::api]</span>
<span class="hljs-comment">; :name ::ping}]</span>
<span class="hljs-comment">; [&quot;/api/admin/users&quot; {:interceptors [::api]</span>
<span class="hljs-comment">; :roles #{:admin}</span>
<span class="hljs-comment">; :name ::users}]</span>
<span class="hljs-comment">; [&quot;/api/admin/db/:db/drop&quot; {:interceptors [::api ::db]</span>
<span class="hljs-comment">; :roles #{:db-admin}</span>
<span class="hljs-comment">; :parameters {:db String}</span>
<span class="hljs-comment">; :name ::drop-db}]</span>
<span class="hljs-comment">; [&quot;/api/admin/db/:db/stats&quot; {:interceptors [::api ::db]</span>
<span class="hljs-comment">; :roles #{:db-admin}</span>
<span class="hljs-comment">; :parameters {:db String}</span>
<span class="hljs-comment">; :name ::db-stats}]]</span>
</code></pre>
<p>Path-based routing:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/match-by-path</span> router <span class="hljs-string">&quot;/api/admin/users&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/api/admin/users&quot;</span>
<span class="hljs-comment">; :meta {:interceptors [::api]</span>
<span class="hljs-comment">; :roles #{:admin}</span>
<span class="hljs-comment">; :name ::users}</span>
<span class="hljs-comment">; :result nil</span>
<span class="hljs-comment">; :params {}</span>
<span class="hljs-comment">; :path &quot;/api/admin/users&quot;}</span>
</code></pre>
<p>On match, route meta-data is returned and can interpreted by the application.</p>
<p>Routers also support meta-data compilation enabling things like fast <a href="https://github.com/ring-clojure/ring" target="_blank">Ring</a> or <a href="http://pedestal.io/" target="_blank">Pedestal</a> -style handlers. Compilation results are found under <code>:result</code> in the match. See <a href="../configuring_routers.html">configuring routers</a> for details.</p>
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<h1 id="route-syntax">Route Syntax</h1>
<p>Routes are defined as vectors, which String path, optional (non-vector) route argument and optional child routes. Routes can be wrapped in vectors.</p>
<p>Simple route:</p>
<pre><code class="lang-clj">[<span class="hljs-string">&quot;/ping&quot;</span>]
</code></pre>
<p>Two routes:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/ping&quot;</span>]
[<span class="hljs-string">&quot;/pong&quot;</span>]]
</code></pre>
<p>Routes with meta-data:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/pong&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::pong</span>}]]
</code></pre>
<p>Routes with path and catch-all parameters:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/users/:user-id&quot;</span>]
[<span class="hljs-string">&quot;/public/*path&quot;</span>]]
</code></pre>
<p>Nested routes with meta-data:</p>
<pre><code class="lang-clj">[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/admin&quot;</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>]}
[<span class="hljs-string">&quot;/user&quot;</span> <span class="hljs-symbol">::user</span>]
[<span class="hljs-string">&quot;/db&quot;</span> <span class="hljs-symbol">::db</span>]
[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]]
</code></pre>
<p>Same routes flattened:</p>
<pre><code class="lang-clj">[[<span class="hljs-string">&quot;/api/admin/user&quot;</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>], <span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user</span>}
[<span class="hljs-string">&quot;/api/admin/db&quot;</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>], <span class="hljs-symbol">:name</span> <span class="hljs-symbol">::db</span>}
[<span class="hljs-string">&quot;/api/ping&quot;</span> <span class="hljs-symbol">::ping</span>]]
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<h1 id="routers">Routers</h1>
<p>For routing, a <code>Router</code> is needed. Reitit ships with several different router implementations: <code>:linear-router</code>, <code>:lookup-router</code> and <code>:mixed-router</code>, based on the awesome <a href="https://github.com/pedestal/pedestal/tree/master/route" target="_blank">Pedestal</a> implementation.</p>
<p><code>Router</code> is created with <code>reitit.core/router</code>, which takes routes and optional options map as arguments. The route tree gets expanded, optionally coerced and compiled. Actual <code>Router</code> implementation is selected automatically but can be defined with a <code>:router</code> option. <code>Router</code> support both path- and name-based lookups.</p>
<p>Creating a router:</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> reitit])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">reitit/router</span>
[[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span> <span class="hljs-symbol">::ping</span>]
[<span class="hljs-string">&quot;/user/:id&quot;</span> <span class="hljs-symbol">::user</span>]]]))
</code></pre>
<p><code>:mixed-router</code> is created (both static &amp; wild routes are found):</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/router-name</span> router)
<span class="hljs-comment">; :mixed-router</span>
</code></pre>
<p>The expanded routes:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/routes</span> router)
<span class="hljs-comment">; [[&quot;/api/ping&quot; {:name :user/ping}]</span>
<span class="hljs-comment">; [&quot;/api/user/:id&quot; {:name :user/user}]]</span>
</code></pre>
<p>Route names:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/route-names</span> router)
<span class="hljs-comment">; [:user/ping :user/user]</span>
</code></pre>
<h3 id="path-based-routing">Path-based routing</h3>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/match-by-path</span> router <span class="hljs-string">&quot;/hello&quot;</span>)
<span class="hljs-comment">; nil</span>
(<span class="hljs-name">reitit/match-by-path</span> router <span class="hljs-string">&quot;/api/user/1&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/api/user/:id&quot;</span>
<span class="hljs-comment">; :meta {:name :user/user}</span>
<span class="hljs-comment">; :path &quot;/api/user/1&quot;</span>
<span class="hljs-comment">; :result nil</span>
<span class="hljs-comment">; :params {:id &quot;1&quot;}}</span>
</code></pre>
<h3 id="name-based-reverse-routing">Name-based (reverse) routing</h3>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/match-by-name</span> router <span class="hljs-symbol">::user</span>)
<span class="hljs-comment">; #PartialMatch{:template &quot;/api/user/:id&quot;,</span>
<span class="hljs-comment">; :meta {:name :user/user},</span>
<span class="hljs-comment">; :result nil,</span>
<span class="hljs-comment">; :params nil,</span>
<span class="hljs-comment">; :required #{:id}}</span>
(<span class="hljs-name">reitit/partial-match?</span> (<span class="hljs-name">reitit/match-by-name</span> router <span class="hljs-symbol">::user</span>))
<span class="hljs-comment">; true</span>
</code></pre>
<p>Only a partial match. Let&apos;s provide the path-parameters:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/match-by-name</span> router <span class="hljs-symbol">::user</span> {<span class="hljs-symbol">:id</span> <span class="hljs-string">&quot;1&quot;</span>})
<span class="hljs-comment">; #Match{:template &quot;/api/user/:id&quot;</span>
<span class="hljs-comment">; :meta {:name :user/user}</span>
<span class="hljs-comment">; :path &quot;/api/user/1&quot;</span>
<span class="hljs-comment">; :result nil</span>
<span class="hljs-comment">; :params {:id &quot;1&quot;}}</span>
</code></pre>
<p>There is also a exception throwing version:</p>
<pre><code class="lang-clj">(<span class="hljs-name">reitit/match-by-name!</span> router <span class="hljs-symbol">::user</span>)
<span class="hljs-comment">; ExceptionInfo missing path-params for route /api/user/:id: #{:id}</span>
</code></pre>
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<h1 id="swagger">Swagger</h1>
<p>Reitit supports <a href="https://swagger.io/" target="_blank">Swagger</a> to generate route documentation. Documentation is extracted from existing coercion definitions <code>:parameters</code>, <code>:responses</code> and from a set of new doumentation keys.</p>
<h3 id="example">Example</h3>
<p>Current <code>reitit-swagger</code> draft (with <code>reitit-ring</code> &amp; data-specs):</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
(<span class="hljs-name">require</span> &apos;[reitit.ring.swagger <span class="hljs-symbol">:as</span> swagger])
(<span class="hljs-name">require</span> &apos;[reitit.ring.coercion <span class="hljs-symbol">:as</span> rrc])
(<span class="hljs-name">require</span> &apos;[reitit.coercion.spec <span class="hljs-symbol">:as</span> spec])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
(<span class="hljs-name">ring/ring-handler</span>
(<span class="hljs-name">ring/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
<span class="hljs-comment">;; identify a swagger api</span>
<span class="hljs-comment">;; there can be several in a routing tree</span>
{<span class="hljs-symbol">:swagger</span> {<span class="hljs-symbol">:id</span> <span class="hljs-symbol">:math</span>}}
<span class="hljs-comment">;; the (undocumented) swagger spec endpoint</span>
[<span class="hljs-string">&quot;/swagger.json&quot;</span>
{<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:no-doc</span> <span class="hljs-literal">true</span>
<span class="hljs-symbol">:swagger</span> {<span class="hljs-symbol">:info</span> {<span class="hljs-symbol">:title</span> <span class="hljs-string">&quot;my-api&quot;</span>}}
<span class="hljs-symbol">:handler</span> (<span class="hljs-name">swagger/create-swagger-handler</span>)}}]
<span class="hljs-comment">;; the (undocumented) swagger-ui</span>
<span class="hljs-comment">;; [org.webjars/swagger-ui &quot;3.13.4&quot;]</span>
[<span class="hljs-string">&quot;/docs/*&quot;</span>
{<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:no-doc</span> <span class="hljs-literal">true</span>
<span class="hljs-symbol">:handler</span> (<span class="hljs-name">ring/create-resource-handler</span>
{<span class="hljs-symbol">:root</span> <span class="hljs-string">&quot;META-INF/resources/webjars/swagger-ui&quot;</span>})}}]
[<span class="hljs-string">&quot;/minus&quot;</span>
{<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:summary</span> <span class="hljs-string">&quot;minus&quot;</span>
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:query</span> {<span class="hljs-symbol">:x</span> int?, <span class="hljs-symbol">:y</span> int?}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> int?}}}
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:query</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">-</span></span> x y)}})}}]
[<span class="hljs-string">&quot;/plus&quot;</span>
{<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:summary</span> <span class="hljs-string">&quot;plus&quot;</span>
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:query</span> {<span class="hljs-symbol">:x</span> int?, <span class="hljs-symbol">:y</span> int?}}
<span class="hljs-symbol">:responses</span> {<span class="hljs-number">200</span> {<span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> int?}}}
<span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [{{{<span class="hljs-symbol">:keys</span> [x y]} <span class="hljs-symbol">:query</span>} <span class="hljs-symbol">:parameters</span>}]
{<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> {<span class="hljs-symbol">:total</span> (<span class="hljs-name"><span class="hljs-builtin-name">+</span></span> x y)}})}}]]
{<span class="hljs-symbol">:data</span> {<span class="hljs-symbol">:middleware</span> [rrc/coerce-exceptions-middleware
rrc/coerce-request-middleware
rrc/coerce-response-middleware
<span class="hljs-comment">;; provides just route data specs</span>
swagger/swagger-feature]
<span class="hljs-symbol">:coercion</span> spec/coercion}})))
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Routing
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Routers
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Route metadata
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Route conflicts
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Validating route-trees
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TODO: Merging route-trees
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<h1 id="validating-route-trees">Validating route-trees</h1>
<p>Namespace <code>reitit.spec</code> contains <a href="https://clojure.org/about/spec" target="_blank">specs</a> for routes, router and router options.</p>
<p>To enable spec-validation of <code>router</code> inputs &amp; outputs at development time, one can do the following:</p>
<pre><code class="lang-clj"><span class="hljs-comment">; add to dependencies:</span>
<span class="hljs-comment">; [expound &quot;0.3.0&quot;]</span>
(<span class="hljs-name">require</span> &apos;[clojure.spec.test.alpha <span class="hljs-symbol">:as</span> st])
(<span class="hljs-name">require</span> &apos;[expound.alpha <span class="hljs-symbol">:as</span> expound])
(<span class="hljs-name">require</span> &apos;[clojure.spec.alpha <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[reitit.spec])
(<span class="hljs-name">st/instrument</span> `reitit/router)
(<span class="hljs-name"><span class="hljs-builtin-name">set!</span></span> s/*explain-out* expound/printer)
(<span class="hljs-name">reitit/router</span>
[<span class="hljs-string">&quot;/api&quot;</span>
[<span class="hljs-string">&quot;/publuc&quot;</span>
[<span class="hljs-string">&quot;/ping&quot;</span>]
[<span class="hljs-string">&quot;pong&quot;</span>]]])
<span class="hljs-comment">; -- Spec failed --------------------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; [&quot;/api&quot; ...]</span>
<span class="hljs-comment">; ^^^^^^</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; should satisfy</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; (clojure.spec.alpha/cat</span>
<span class="hljs-comment">; :path</span>
<span class="hljs-comment">; :reitit.spec/path</span>
<span class="hljs-comment">; :arg</span>
<span class="hljs-comment">; (clojure.spec.alpha/? :reitit.spec/arg)</span>
<span class="hljs-comment">; :childs</span>
<span class="hljs-comment">; (clojure.spec.alpha/* (clojure.spec.alpha/and :reitit.spec/raw-route)))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -- Relevant specs -------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; :reitit.spec/raw-route:</span>
<span class="hljs-comment">; (clojure.spec.alpha/cat</span>
<span class="hljs-comment">; :path</span>
<span class="hljs-comment">; :reitit.spec/path</span>
<span class="hljs-comment">; :arg</span>
<span class="hljs-comment">; (clojure.spec.alpha/? :reitit.spec/arg)</span>
<span class="hljs-comment">; :childs</span>
<span class="hljs-comment">; (clojure.spec.alpha/* (clojure.spec.alpha/and :reitit.spec/raw-route)))</span>
<span class="hljs-comment">; :reitit.spec/raw-routes:</span>
<span class="hljs-comment">; (clojure.spec.alpha/or</span>
<span class="hljs-comment">; :route</span>
<span class="hljs-comment">; :reitit.spec/raw-route</span>
<span class="hljs-comment">; :routes</span>
<span class="hljs-comment">; (clojure.spec.alpha/coll-of :reitit.spec/raw-route :into []))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -- Spec failed --------------------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; [... [... ... [&quot;pong&quot;]]]</span>
<span class="hljs-comment">; ^^^^^^</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; should satisfy</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; (fn [%] (clojure.string/starts-with? % &quot;/&quot;))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -- Relevant specs -------</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; :reitit.spec/path:</span>
<span class="hljs-comment">; (clojure.spec.alpha/and</span>
<span class="hljs-comment">; clojure.core/string?</span>
<span class="hljs-comment">; (clojure.core/fn [%] (clojure.string/starts-with? % &quot;/&quot;)))</span>
<span class="hljs-comment">; :reitit.spec/raw-route:</span>
<span class="hljs-comment">; (clojure.spec.alpha/cat</span>
<span class="hljs-comment">; :path</span>
<span class="hljs-comment">; :reitit.spec/path</span>
<span class="hljs-comment">; :arg</span>
<span class="hljs-comment">; (clojure.spec.alpha/? :reitit.spec/arg)</span>
<span class="hljs-comment">; :childs</span>
<span class="hljs-comment">; (clojure.spec.alpha/* (clojure.spec.alpha/and :reitit.spec/raw-route)))</span>
<span class="hljs-comment">; :reitit.spec/raw-routes:</span>
<span class="hljs-comment">; (clojure.spec.alpha/or</span>
<span class="hljs-comment">; :route</span>
<span class="hljs-comment">; :reitit.spec/raw-route</span>
<span class="hljs-comment">; :routes</span>
<span class="hljs-comment">; (clojure.spec.alpha/coll-of :reitit.spec/raw-route :into []))</span>
<span class="hljs-comment">;</span>
<span class="hljs-comment">; -------------------------</span>
<span class="hljs-comment">; Detected 2 errors</span>
</code></pre>
<h3 id="validating-meta-data">Validating meta-data</h3>
<p><em>TODO</em></p>
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