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Route Validation
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Dynamic Extensions
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< a href = ".." > Dynamic Extensions< / a >
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< h1 id = "dynamic-extensions" > Dynamic Extensions< / h1 >
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< 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 ad-hoc extensions to the system.< / p >
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< p > Example middleware to guard routes based on user roles:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.ring < span class = "hljs-symbol" > :as< / span > ring])
(< span class = "hljs-name" > require< / span > ' [clojure.set < span class = "hljs-symbol" > :as< / span > set])
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(< 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}]
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(< 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 > )]
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(< 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)))
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{< 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 >
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< p > Mounted to an app via router data (effecting all routes):< / p >
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< 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" > " 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" > " /ping" < / span > handler]
[< span class = "hljs-string" > " /admin" < / span > {< span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }}
[< span class = "hljs-string" > " /ping" < / span > handler]]]]
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{< span class = "hljs-symbol" > :data< / span > {< span class = "hljs-symbol" > :middleware< / span > [wrap-enforce-roles]}})))
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< / 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" > " /api/ping" < / span > })
< span class = "hljs-comment" > ; {:status 200, :body " ok" }< / 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" > " /api/admin/ping" < / span > })
< span class = "hljs-comment" > ; {:status 403, :body " forbidden" }< / 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" > " /api/admin/ping" < / span > , < span class = "hljs-symbol" > ::roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }})
< span class = "hljs-comment" > ; {:status 200, :body " ok" }< / span >
< / code > < / pre >
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< p > Dynamic extensions are nice, but we can do much better. See < a href = "data_driven_middleware.html" > data-driven middleware< / a > and < a href = "compiling_middleware.html" > compiling routes< / a > .< / p >
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