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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Network.CGI.Compat</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) The University of Glasgow 2001</span>
<a name="line-5"></a><span class='hs-comment'>-- (c) Bjorn Bringert 2004-2006</span>
<a name="line-6"></a><span class='hs-comment'>-- (c) Ian Lynagh 2005</span>
<a name="line-7"></a><span class='hs-comment'>-- (c) Jeremy Shaw 2005</span>
<a name="line-8"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-9"></a><span class='hs-comment'>--</span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : Anders Kaseorg <andersk@mit.edu></span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : non-portable (uses Control.Monad.State)</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- Compatibility functions for the old Network.CGI API.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>CGI</span><span class='hs-varop'>.</span><span class='hs-conid'>Compat</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-conid'>Html</span><span class='hs-layout'>,</span> <span class='hs-varid'>wrapper</span><span class='hs-layout'>,</span> <span class='hs-varid'>pwrapper</span><span class='hs-layout'>,</span> <span class='hs-varid'>connectToCGIScript</span>
<a name="line-20"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span> <span class='hs-layout'>(</span><span class='hs-varid'>forkIO</span><span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>Extensible</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeException</span><span class='hs-layout'>,</span><span class='hs-varid'>throw</span><span class='hs-layout'>,</span><span class='hs-varid'>catch</span><span class='hs-layout'>,</span><span class='hs-varid'>finally</span><span class='hs-layout'>)</span>
<a name="line-24"></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-layout'>(</span><span class='hs-varid'>unless</span><span class='hs-layout'>)</span>
<a name="line-25"></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'>Trans</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadIO</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftIO</span><span class='hs-layout'>)</span>
<a name="line-26"></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'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Map</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span> <span class='hs-layout'>(</span><span class='hs-conid'>PortID</span><span class='hs-layout'>,</span> <span class='hs-conid'>Socket</span><span class='hs-layout'>,</span> <span class='hs-varid'>listenOn</span><span class='hs-layout'>,</span> <span class='hs-varid'>connectTo</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Socket</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddr</span><span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>accept</span><span class='hs-layout'>,</span> <span class='hs-varid'>socketToHandle</span><span class='hs-layout'>)</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span><span class='hs-layout'>,</span> <span class='hs-varid'>hPutStrLn</span><span class='hs-layout'>,</span> <span class='hs-varid'>stdin</span><span class='hs-layout'>,</span> <span class='hs-varid'>stdout</span><span class='hs-layout'>,</span>
<a name="line-30"></a> <span class='hs-varid'>hGetLine</span><span class='hs-layout'>,</span> <span class='hs-varid'>hClose</span><span class='hs-layout'>,</span> <span class='hs-conid'>IOMode</span><span class='hs-layout'>(</span><span class='hs-conid'>ReadWriteMode</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-layout'>(</span><span class='hs-varid'>isEOFError</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></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'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>BS</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>XHtml</span> <span class='hs-layout'>(</span><span class='hs-conid'>Html</span><span class='hs-layout'>,</span> <span class='hs-varid'>renderHtml</span><span class='hs-layout'>)</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>CGI</span><span class='hs-varop'>.</span><span class='hs-conid'>Protocol</span>
<a name="line-39"></a>
<a name="line-40"></a>
<a name="line-41"></a><span class='hs-comment'>{-# DEPRECATED wrapper, pwrapper, connectToCGIScript "Use the new interface." #-}</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="wrapper"></a><span class='hs-comment'>-- | Compatibility wrapper for the old CGI interface.</span>
<a name="line-44"></a><span class='hs-comment'>-- Output the output from a function from CGI environment and</span>
<a name="line-45"></a><span class='hs-comment'>-- input variables to an HTML document.</span>
<a name="line-46"></a><span class='hs-definition'>wrapper</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Html</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-47"></a><span class='hs-definition'>wrapper</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>run</span> <span class='hs-varid'>stdin</span> <span class='hs-varid'>stdout</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="pwrapper"></a><span class='hs-comment'>-- | Compatibility wrapper for the old CGI interface.</span>
<a name="line-50"></a><span class='hs-comment'>-- Runs a simple CGI server.</span>
<a name="line-51"></a><span class='hs-comment'>-- Note: if using Windows, you might need to wrap 'Network.withSocketsDo' around main.</span>
<a name="line-52"></a><span class='hs-definition'>pwrapper</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PortID</span> <span class='hs-comment'>-- ^ The port to run the server on.</span>
<a name="line-53"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Html</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-55"></a><span class='hs-definition'>pwrapper</span> <span class='hs-varid'>pid</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>sock</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>listenOn</span> <span class='hs-varid'>pid</span>
<a name="line-56"></a> <span class='hs-varid'>acceptConnections</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>sock</span>
<a name="line-57"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>run</span> <span class='hs-varid'>h</span> <span class='hs-varid'>h</span> <span class='hs-varid'>f</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="acceptConnections"></a><span class='hs-definition'>acceptConnections</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Socket</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-60"></a><span class='hs-definition'>acceptConnections</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>sock</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-61"></a> <span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-layout'>,</span> <span class='hs-conid'>SockAddrInet</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>accept'</span> <span class='hs-varid'>sock</span>
<a name="line-62"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>forkIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>fn</span> <span class='hs-varid'>h</span> <span class='hs-varop'>`finally`</span> <span class='hs-layout'>(</span><span class='hs-varid'>hClose</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-63"></a> <span class='hs-varid'>acceptConnections</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>sock</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="accept'"></a><span class='hs-definition'>accept'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-comment'>-- Listening Socket</span>
<a name="line-66"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span><span class='hs-layout'>,</span><span class='hs-conid'>SockAddr</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- StdIO Handle for read/write</span>
<a name="line-67"></a><span class='hs-definition'>accept'</span> <span class='hs-varid'>sock</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-68"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sock'</span><span class='hs-layout'>,</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-varid'>accept</span> <span class='hs-varid'>sock</span>
<a name="line-69"></a> <span class='hs-varid'>handle</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock'</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-70"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>handle</span><span class='hs-layout'>,</span><span class='hs-varid'>addr</span><span class='hs-layout'>)</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="run"></a><span class='hs-definition'>run</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Html</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-73"></a><span class='hs-definition'>run</span> <span class='hs-varid'>inh</span> <span class='hs-varid'>outh</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-74"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>env</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getCGIVars</span>
<a name="line-75"></a> <span class='hs-varid'>hRunCGI</span> <span class='hs-varid'>env</span> <span class='hs-varid'>inh</span> <span class='hs-varid'>outh</span> <span class='hs-varid'>f'</span>
<a name="line-76"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f'</span> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>toList</span> <span class='hs-layout'>(</span><span class='hs-varid'>cgiVars</span> <span class='hs-varid'>req</span><span class='hs-layout'>)</span>
<a name="line-77"></a> <span class='hs-varid'>is</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span><span class='hs-conid'>BS</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span> <span class='hs-layout'>(</span><span class='hs-varid'>inputValue</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cgiInputs</span> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>]</span>
<a name="line-78"></a> <span class='hs-varid'>html</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>liftIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>vs</span><span class='hs-varop'>++</span><span class='hs-varid'>is</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-79"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-conid'>CGIOutput</span> <span class='hs-varop'>$</span> <span class='hs-conid'>BS</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-varop'>$</span> <span class='hs-varid'>renderHtml</span> <span class='hs-varid'>html</span><span class='hs-layout'>)</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="connectToCGIScript"></a><span class='hs-comment'>-- | Note: if using Windows, you might need to wrap 'Network.withSocketsDo' around main.</span>
<a name="line-82"></a><span class='hs-definition'>connectToCGIScript</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PortID</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-83"></a><span class='hs-definition'>connectToCGIScript</span> <span class='hs-varid'>host</span> <span class='hs-varid'>portId</span>
<a name="line-84"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>env</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getCGIVars</span>
<a name="line-85"></a> <span class='hs-varid'>input</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>BS</span><span class='hs-varop'>.</span><span class='hs-varid'>hGetContents</span> <span class='hs-varid'>stdin</span>
<a name="line-86"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getRequestInput</span> <span class='hs-varid'>env</span> <span class='hs-varid'>input</span>
<a name="line-87"></a> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>connectTo</span> <span class='hs-varid'>host</span> <span class='hs-varid'>portId</span>
<a name="line-88"></a> <span class='hs-varop'>`</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span><span class='hs-varop'>`</span>
<a name="line-89"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>abort</span> <span class='hs-str'>"Cannot connect to CGI daemon."</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-conid'>BS</span><span class='hs-varop'>.</span><span class='hs-varid'>hPut</span> <span class='hs-varid'>h</span> <span class='hs-varid'>str</span> <span class='hs-varop'>>></span> <span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>h</span> <span class='hs-str'>""</span>
<a name="line-91"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sendBack</span> <span class='hs-varid'>h</span> <span class='hs-varop'>`finally`</span> <span class='hs-varid'>hClose</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span>
<a name="line-92"></a> <span class='hs-varop'>`</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span><span class='hs-varop'>`</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>isEOFError</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>ioError</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="getRequestInput"></a><span class='hs-comment'>-- | Returns the query string, or the request body if it is</span>
<a name="line-95"></a><span class='hs-comment'>-- a POST request, or the empty string if there is an error.</span>
<a name="line-96"></a><span class='hs-definition'>getRequestInput</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ CGI environment variables.</span>
<a name="line-97"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-comment'>-- ^ Request body.</span>
<a name="line-98"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-comment'>-- ^ Query string.</span>
<a name="line-99"></a><span class='hs-definition'>getRequestInput</span> <span class='hs-varid'>env</span> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span>
<a name="line-100"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-str'>"REQUEST_METHOD"</span> <span class='hs-varid'>env</span> <span class='hs-keyword'>of</span>
<a name="line-101"></a> <span class='hs-conid'>Just</span> <span class='hs-str'>"POST"</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>takeInput</span> <span class='hs-varid'>env</span> <span class='hs-varid'>req</span>
<a name="line-102"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>maybe</span> <span class='hs-conid'>BS</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-conid'>BS</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-layout'>(</span><span class='hs-varid'>lookup</span> <span class='hs-str'>"QUERY_STRING"</span> <span class='hs-varid'>env</span><span class='hs-layout'>)</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="abort"></a><span class='hs-definition'>abort</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SomeException</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-105"></a><span class='hs-definition'>abort</span> <span class='hs-varid'>msg</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span>
<a name="line-106"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>putStrLn</span> <span class='hs-layout'>(</span><span class='hs-str'>"Content-type: text/html\n\n"</span> <span class='hs-varop'>++</span>
<a name="line-107"></a> <span class='hs-str'>"<html><body>"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>msg</span> <span class='hs-varop'>++</span> <span class='hs-str'>"</body></html>"</span><span class='hs-layout'>)</span>
<a name="line-108"></a> <span class='hs-varid'>throw</span> <span class='hs-varid'>e</span>
<a name="line-109"></a>
<a name="line-110"></a><a name="sendBack"></a><span class='hs-definition'>sendBack</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-111"></a><span class='hs-definition'>sendBack</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hGetLine</span> <span class='hs-varid'>h</span>
<a name="line-112"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varid'>s</span>
<a name="line-113"></a> <span class='hs-varid'>sendBack</span> <span class='hs-varid'>h</span>
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