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<title>Network/Wai/Middleware/Rewrite.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE OverloadedStrings #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Wai</span><span class='hs-varop'>.</span><span class='hs-conid'>Middleware</span><span class='hs-varop'>.</span><span class='hs-conid'>Rewrite</span>
<a name="line-3"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>rewrite</span><span class='hs-layout'>,</span> <span class='hs-varid'>rewritePure</span>
<a name="line-4"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Wai</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftIO</span><span class='hs-layout'>)</span>
<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'>Text</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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-keyword'>as</span> <span class='hs-conid'>TE</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>T</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>HTTP</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>H</span>
<a name="line-12"></a>
<a name="line-13"></a>
<a name="line-14"></a><a name="rewrite"></a><span class='hs-comment'>-- | rewrite based on your own conversion rules</span>
<a name="line-15"></a><span class='hs-definition'>rewrite</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-conid'>RequestHeaders</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Middleware</span>
<a name="line-16"></a><span class='hs-definition'>rewrite</span> <span class='hs-varid'>convert</span> <span class='hs-varid'>app</span> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-17"></a> <span class='hs-varid'>newPathInfo</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>convert</span> <span class='hs-layout'>(</span><span class='hs-varid'>pathInfo</span> <span class='hs-varid'>req</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>requestHeaders</span> <span class='hs-varid'>req</span><span class='hs-layout'>)</span>
<a name="line-18"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>rawPInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>encodeUtf8</span> <span class='hs-varop'>$</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>intercalate</span> <span class='hs-str'>"/"</span> <span class='hs-varid'>newPathInfo</span>
<a name="line-19"></a> <span class='hs-varid'>app</span> <span class='hs-varid'>req</span> <span class='hs-layout'>{</span> <span class='hs-varid'>pathInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>newPathInfo</span><span class='hs-layout'>,</span> <span class='hs-varid'>rawPathInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rawPInfo</span> <span class='hs-layout'>}</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-comment'>-- | rewrite based on your own conversion rules</span>
<a name="line-22"></a><span class='hs-comment'>-- Example convert function:</span>
<a name="line-23"></a>
<a name="line-24"></a><a name="rewritePure"></a><span class='hs-comment'>-- staticConvert :: [Text] -> H.RequestHeaders -> [Text]</span>
<a name="line-25"></a><span class='hs-comment'>-- staticConvert pieces _ = piecesConvert pieces</span>
<a name="line-26"></a><span class='hs-comment'>-- where</span>
<a name="line-27"></a><span class='hs-comment'>-- piecesConvert [] = ["static", "html", "pages.html"]</span>
<a name="line-28"></a><span class='hs-comment'>-- piecesConvert route@("pages":_) = "static":"html":route</span>
<a name="line-29"></a><span class='hs-definition'>rewritePure</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-conid'>RequestHeaders</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Middleware</span>
<a name="line-30"></a><span class='hs-definition'>rewritePure</span> <span class='hs-varid'>convert</span> <span class='hs-varid'>app</span> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span>
<a name="line-31"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>pInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>convert</span> <span class='hs-layout'>(</span><span class='hs-varid'>pathInfo</span> <span class='hs-varid'>req</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>requestHeaders</span> <span class='hs-varid'>req</span><span class='hs-layout'>)</span>
<a name="line-32"></a> <span class='hs-varid'>rawPInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>encodeUtf8</span> <span class='hs-varop'>$</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>intercalate</span> <span class='hs-str'>"/"</span> <span class='hs-varid'>pInfo</span>
<a name="line-33"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>app</span> <span class='hs-varid'>req</span> <span class='hs-layout'>{</span> <span class='hs-varid'>pathInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pInfo</span><span class='hs-layout'>,</span> <span class='hs-varid'>rawPathInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rawPInfo</span> <span class='hs-layout'>}</span>
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