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Route Data Validation
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Different Routers
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Route Validation
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< h1 id = "route-data-validation" > Route Data Validation< / h1 >
< p > Ring route validation works < a href = "../basics/route_data_validation.html" > just like with core router< / a > , with few differences:< / p >
< ul >
< li > < code > reitit.ring.spec/validate-spec!< / code > should be used instead of < code > reitit.spec/validate-spec!< / code > - to support validating all endpoints (< code > :get< / code > , < code > :post< / code > etc.)< / li >
< li > With < code > clojure.spec< / code > validation, Middleware can contribute to route spec via < code > :specs< / code > key. The effective route data spec is router spec merged with middleware specs.< / li >
< / ul >
< h2 id = "example" > Example< / h2 >
< p > A simple app with spec-validation turned on:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [clojure.spec.alpha < span class = "hljs-symbol" > :as< / span > s])
(< span class = "hljs-name" > require< / span > ' [reitit.ring < span class = "hljs-symbol" > :as< / span > ring])
(< span class = "hljs-name" > require< / span > ' [reitit.ring.spec < span class = "hljs-symbol" > :as< / span > rrs])
(< span class = "hljs-name" > require< / span > ' [reitit.spec < span class = "hljs-symbol" > :as< / span > rs])
(< span class = "hljs-name" > require< / span > ' [expound.alpha < span class = "hljs-symbol" > :as< / span > e])
(< 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" > " ok" < / 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" > " /api" < / span >
[< span class = "hljs-string" > " /public" < / span >
[< span class = "hljs-string" > " /ping" < / span > {< span class = "hljs-symbol" > :get< / span > handler}]]
[< span class = "hljs-string" > " /internal" < / span >
[< span class = "hljs-string" > " /users" < / span > {< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler}
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler}}]]]
{< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
< / code > < / pre >
< p > All good:< / 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" > " /api/internal/users" < / span > })
< span class = "hljs-comment" > ; {:status 200, :body " ok" }< / span >
< / code > < / pre >
< h3 id = "explicit-specs-via-middleware" > Explicit specs via middleware< / h3 >
< p > Middleware that requires < code > :zone< / code > to be present in route data:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::zone< / span > #{< span class = "hljs-symbol" > :public< / span > < span class = "hljs-symbol" > :internal< / span > })
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > zone-middleware
{< span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::zone-middleware< / span >
< span class = "hljs-symbol" > :spec< / span > (< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > ::zone< / span > ])
< span class = "hljs-symbol" > :wrap< / span > (< 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" > < span class = "hljs-builtin-name" > let< / span > < / span > [zone (< span class = "hljs-name" > < span class = "hljs-builtin-name" > -> < / span > < / span > request (< span class = "hljs-name" > ring/get-match< / span > ) < span class = "hljs-symbol" > :data< / span > < span class = "hljs-symbol" > :zone< / span > )]
(< span class = "hljs-name" > println< / span > zone)
(< span class = "hljs-name" > handler< / span > request))))})
< / code > < / pre >
< p > Missing route data fails fast at router creation:< / 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" > " /api" < / span > {< span class = "hljs-symbol" > :middleware< / span > [zone-middleware]} < span class = "hljs-comment" > ;; < --- added< / span >
[< span class = "hljs-string" > " /public" < / span >
[< span class = "hljs-string" > " /ping" < / span > {< span class = "hljs-symbol" > :get< / span > handler}]]
[< span class = "hljs-string" > " /internal" < / span >
[< span class = "hljs-string" > " /users" < / span > {< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler}
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler}}]]]
{< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
< span class = "hljs-comment" > ; CompilerException clojure.lang.ExceptionInfo: Invalid route data:< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- On route -----------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; " /api/public/ping" :get< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- Spec failed --------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; {:middleware ...,< / span >
< span class = "hljs-comment" > ; :handler ...}< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; should contain key: `:zone`< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; | key | spec |< / span >
< span class = "hljs-comment" > ; |-------+-------|< / span >
< span class = "hljs-comment" > ; | :zone | :zone |< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- On route -----------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; " /api/internal/users" :get< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- Spec failed --------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; {:middleware ...,< / span >
< span class = "hljs-comment" > ; :handler ...}< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; should contain key: `:zone`< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; | key | spec |< / span >
< span class = "hljs-comment" > ; |-------+-------|< / span >
< span class = "hljs-comment" > ; | :zone | :zone |< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- On route -----------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; " /api/internal/users" :delete< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- Spec failed --------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; {:middleware ...,< / span >
< span class = "hljs-comment" > ; :handler ...}< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; should contain key: `:zone`< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; | key | spec |< / span >
< span class = "hljs-comment" > ; |-------+-------|< / span >
< span class = "hljs-comment" > ; | :zone | :zone |< / span >
< / code > < / pre >
< p > Adding the < code > :zone< / code > to route data fixes the problem:< / 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" > " /api" < / span > {< span class = "hljs-symbol" > :middleware< / span > [zone-middleware]}
[< span class = "hljs-string" > " /public" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :public< / span > } < span class = "hljs-comment" > ;; < --- added< / span >
[< span class = "hljs-string" > " /ping" < / span > {< span class = "hljs-symbol" > :get< / span > handler}]]
[< span class = "hljs-string" > " /internal" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :internal< / span > } < span class = "hljs-comment" > ;; < --- added< / span >
[< span class = "hljs-string" > " /users" < / span > {< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler}
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler}}]]]
{< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
(< 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" > " /api/internal/users" < / span > })
< span class = "hljs-comment" > ; in zone :internal< / span >
< span class = "hljs-comment" > ; => {:status 200, :body " ok" }< / span >
< / code > < / pre >
< h3 id = "implicit-specs" > Implicit specs< / h3 >
< p > By design, clojure.spec validates all fully-qualified keys with < code > s/keys< / code > specs even if they are not defined in that keyset. Validation in implicit but powerful.< / p >
< p > Let' s reuse the < code > wrap-enforce-roles< / code > from < a href = "dynamic_extensions.html" > Dynamic extensions< / a > and define specs for the data:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [clojure.set < span class = "hljs-symbol" > :as< / span > set])
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::role< / span > #{< span class = "hljs-symbol" > :admin< / span > < span class = "hljs-symbol" > :manager< / span > })
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::roles< / span > (< span class = "hljs-name" > s/coll-of< / span > < span class = "hljs-symbol" > ::role< / span > < span class = "hljs-symbol" > :into< / span > #{}))
(< 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-> < / span > request (< span class = "hljs-name" > ring/get-match< / span > ) < span class = "hljs-symbol" > :data< / 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/subset?< / 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" > " forbidden" < / span > }
(< span class = "hljs-name" > handler< / span > request)))))
< / code > < / pre >
< p > < code > wrap-enforce-roles< / code > silently ignores if the < code > ::roles< / code > is not present:< / 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" > " /api" < / span > {< span class = "hljs-symbol" > :middleware< / span > [zone-middleware
wrap-enforce-roles]} < span class = "hljs-comment" > ;; < --- added< / span >
[< span class = "hljs-string" > " /public" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :public< / span > }
[< span class = "hljs-string" > " /ping" < / span > {< span class = "hljs-symbol" > :get< / span > handler}]]
[< span class = "hljs-string" > " /internal" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :internal< / span > }
[< span class = "hljs-string" > " /users" < / span > {< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler}
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler}}]]]
{< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
(< 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" > " /api/zones/admin/ping" < / span > })
< span class = "hljs-comment" > ; in zone :internal< / span >
< span class = "hljs-comment" > ; => {:status 200, :body " ok" }< / span >
< / code > < / pre >
< p > But fails if they are present and invalid:< / 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" > " /api" < / span > {< span class = "hljs-symbol" > :middleware< / span > [zone-middleware
wrap-enforce-roles]}
[< span class = "hljs-string" > " /public" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :public< / span > }
[< span class = "hljs-string" > " /ping" < / span > {< span class = "hljs-symbol" > :get< / span > handler}]]
[< span class = "hljs-string" > " /internal" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :internal< / span > }
[< span class = "hljs-string" > " /users" < / span > {< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :manager< / span > } < span class = "hljs-comment" > ;; < --- added< / span >
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :adminz< / span > }}}]]] < span class = "hljs-comment" > ;; < --- added< / span >
{< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
< span class = "hljs-comment" > ; CompilerException clojure.lang.ExceptionInfo: Invalid route data:< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- On route -----------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; " /api/internal/users" :delete< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; -- Spec failed --------------------< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; {:middleware ...,< / span >
< span class = "hljs-comment" > ; :zone ...,< / span >
< span class = "hljs-comment" > ; :handler ...,< / span >
< span class = "hljs-comment" > ; :user/roles #{:adminz}}< / span >
< span class = "hljs-comment" > ; ^^^^^^^< / span >
< span class = "hljs-comment" > ;< / span >
< span class = "hljs-comment" > ; should be one of: `:admin`,`:manager`< / span >
< / code > < / pre >
< h3 id = "pushing-the-data-to-the-endpoints" > Pushing the data to the endpoints< / h3 >
2018-02-11 19:36:11 +00:00
< p > Ability to define (and reuse) route-data in mid-paths is a powerful feature, but having data defined all around might be harder to reason about. There is always an option to define all data at the endpoints.< / p >
2017-12-29 10:06:19 +00:00
< 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" > " /api" < / span >
[< span class = "hljs-string" > " /public" < / span >
[< span class = "hljs-string" > " /ping" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :public< / span >
< span class = "hljs-symbol" > :get< / span > handler
< span class = "hljs-symbol" > :middleware< / span > [zone-middleware
wrap-enforce-roles]}]]
[< span class = "hljs-string" > " /internal" < / span >
[< span class = "hljs-string" > " /users" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :internal< / span >
< span class = "hljs-symbol" > :middleware< / span > [zone-middleware
wrap-enforce-roles]
< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :manager< / span > }}
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }}}]]]
{< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
< / code > < / pre >
< p > Or even flatten the routes:< / 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" > " /api/public/ping" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :public< / span >
< span class = "hljs-symbol" > :get< / span > handler
< span class = "hljs-symbol" > :middleware< / span > [zone-middleware
wrap-enforce-roles]}]
[< span class = "hljs-string" > " /api/internal/users" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :internal< / span >
< span class = "hljs-symbol" > :middleware< / span > [zone-middleware
wrap-enforce-roles]
< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :manager< / span > }}
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }}}]]
{< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
< / code > < / pre >
< p > The common Middleware can also be pushed to the router, here cleanly separing behavior and data:< / 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" > " /api/public/ping" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :public< / span >
< span class = "hljs-symbol" > :get< / span > handler}]
[< span class = "hljs-string" > " /api/internal/users" < / span > {< span class = "hljs-symbol" > :zone< / span > < span class = "hljs-symbol" > :internal< / span >
< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :manager< / span > }}
< span class = "hljs-symbol" > :delete< / span > {< span class = "hljs-symbol" > :handler< / span > handler
< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }}}]]
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{< span class = "hljs-symbol" > :data< / span > {< span class = "hljs-symbol" > :middleware< / span > [zone-middleware wrap-enforce-roles]}
2017-12-29 10:06:19 +00:00
< span class = "hljs-symbol" > :validate< / span > rrs/validate-spec!
< span class = "hljs-symbol" > ::rs/explain< / span > e/expound-str})))
< / code > < / pre >
< / section >
< / div >
< div class = "search-results" >
< div class = "has-results" >
< h1 class = "search-results-title" > < span class = 'search-results-count' > < / span > results matching "< span class = 'search-query' > < / span > "< / h1 >
< ul class = "search-results-list" > < / ul >
< / div >
< div class = "no-results" >
< h1 class = "search-results-title" > No results matching "< span class = 'search-query' > < / span > "< / h1 >
< / div >
< / div >
< / div >
< / div >
< / div >
< / div >
< a href = "coercion.html" class = "navigation navigation-prev " aria-label = "Previous page: Pluggable Coercion" >
< i class = "fa fa-angle-left" > < / i >
< / a >
< a href = "compiling_middleware.html" class = "navigation navigation-next " aria-label = "Next page: Compiling Middleware" >
< i class = "fa fa-angle-right" > < / i >
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< script src = "../gitbook/gitbook-plugin-editlink/plugin.js" > < / script >
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