70 lines
10 KiB
HTML
70 lines
10 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
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<title>src/Servant/API/Header.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE PolyKinds #-}</span>
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<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
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<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE TypeOperators #-}</span>
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<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
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<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables #-}</span>
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<a name="line-6"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Header</span> <span class='hs-keyword'>where</span>
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<a name="line-7"></a>
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<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Proxy</span>
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<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span>
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<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Encoding</span> <span class='hs-layout'>(</span><span class='hs-varid'>decodeUtf8</span><span class='hs-layout'>)</span>
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<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeLits</span>
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<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Wai</span>
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<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>API</span><span class='hs-varop'>.</span><span class='hs-conid'>Sub</span>
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<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
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<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Servant</span><span class='hs-varop'>.</span><span class='hs-conid'>Server</span>
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<a name="line-16"></a>
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<a name="line-17"></a><a name="HasServer"></a><span class='hs-comment'>-- | Extract the given header's value as a value of type @a@.</span>
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<a name="line-18"></a><a name="HasServer"></a><span class='hs-comment'>--</span>
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<a name="line-19"></a><a name="HasServer"></a><span class='hs-comment'>-- Example:</span>
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<a name="line-20"></a><a name="HasServer"></a><span class='hs-comment'>--</span>
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<a name="line-21"></a><a name="HasServer"></a><span class='hs-comment'>-- > newtype Referer = Referer Text</span>
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<a name="line-22"></a><a name="HasServer"></a><span class='hs-comment'>-- > deriving (Eq, Show, FromText, ToText)</span>
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<a name="line-23"></a><a name="HasServer"></a><span class='hs-comment'>-- ></span>
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<a name="line-24"></a><a name="HasServer"></a><span class='hs-comment'>-- > -- GET /view-my-referer</span>
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<a name="line-25"></a><a name="HasServer"></a><span class='hs-comment'>-- > type MyApi = "view-my-referer" :> Header "from" Referer :> Get Referer</span>
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<a name="line-26"></a><a name="HasServer"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Header</span> <span class='hs-varid'>sym</span> <span class='hs-varid'>a</span>
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<a name="line-27"></a>
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<a name="line-28"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- | If you use 'Header' in one of the endpoints for your API,</span>
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<a name="line-29"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- this automatically requires your server-side handler to be a function</span>
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<a name="line-30"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- that takes an argument of the type specified by 'Header'.</span>
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<a name="line-31"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- This lets servant worry about extracting it from the request and turning</span>
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<a name="line-32"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- it into a value of the type you specify.</span>
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<a name="line-33"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>--</span>
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<a name="line-34"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- All it asks is for a 'FromText' instance.</span>
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<a name="line-35"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>--</span>
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<a name="line-36"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- Example:</span>
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<a name="line-37"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>--</span>
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<a name="line-38"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > newtype Referer = Referer Text</span>
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<a name="line-39"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > deriving (Eq, Show, FromText, ToText)</span>
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<a name="line-40"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- ></span>
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<a name="line-41"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > -- GET /view-my-referer</span>
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<a name="line-42"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > type MyApi = "view-my-referer" :> Header "Referer" Referer :> Get Referer</span>
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<a name="line-43"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- ></span>
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<a name="line-44"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > server :: Server MyApi</span>
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<a name="line-45"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > server = viewReferer</span>
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<a name="line-46"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > where viewReferer :: Referer -> EitherT (Int, String) IO referer</span>
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<a name="line-47"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-comment'>-- > viewReferer referer = return referer</span>
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<a name="line-48"></a><a name="instance%20HasServer%20(Header%20sym%20a%20:%3e%20sublayout)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>KnownSymbol</span> <span class='hs-varid'>sym</span><span class='hs-layout'>,</span> <span class='hs-conid'>FromText</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>HasServer</span> <span class='hs-varid'>sublayout</span><span class='hs-layout'>)</span>
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<a name="line-49"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HasServer</span> <span class='hs-layout'>(</span><span class='hs-conid'>Header</span> <span class='hs-varid'>sym</span> <span class='hs-varid'>a</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sublayout</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
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<a name="line-50"></a>
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<a name="line-51"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Server</span> <span class='hs-layout'>(</span><span class='hs-conid'>Header</span> <span class='hs-varid'>sym</span> <span class='hs-varid'>a</span> <span class='hs-conop'>:></span> <span class='hs-varid'>sublayout</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
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<a name="line-52"></a> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Server</span> <span class='hs-varid'>sublayout</span>
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<a name="line-53"></a>
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<a name="line-54"></a> <span class='hs-varid'>route</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>subserver</span> <span class='hs-varid'>request</span> <span class='hs-varid'>respond</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
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<a name="line-55"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>mheader</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromText</span> <span class='hs-varop'>.</span> <span class='hs-varid'>decodeUtf8</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>str</span> <span class='hs-layout'>(</span><span class='hs-varid'>requestHeaders</span> <span class='hs-varid'>request</span><span class='hs-layout'>)</span>
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<a name="line-56"></a> <span class='hs-varid'>route</span> <span class='hs-layout'>(</span><span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>sublayout</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>subserver</span> <span class='hs-varid'>mheader</span><span class='hs-layout'>)</span> <span class='hs-varid'>request</span> <span class='hs-varid'>respond</span>
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<a name="line-57"></a>
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<a name="line-58"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromString</span> <span class='hs-varop'>$</span> <span class='hs-varid'>symbolVal</span> <span class='hs-layout'>(</span><span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>sym</span><span class='hs-layout'>)</span>
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</pre></body>
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