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<!DOCTYPE html> <html> <head> <title>proxy-table.js</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" media="all" href="docco.css" /> </head> <body> <div id="container"> <div id="background"></div> <div id="jump_to"> Jump To &hellip; <div id="jump_wrapper"> <div id="jump_page"> <a class="source" href="node-http-proxy.html"> node-http-proxy.html </a> <a class="source" href="proxy-table.html"> proxy-table.html </a> </div> </div> </div> <table cellpadding="0" cellspacing="0"> <thead> <tr> <th class="docs"> <h1> proxy-table.js </h1> </th> <th class="code"> </th> </tr> </thead> <tbody> <tr id="section-1"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-1">&#182;</a> </div> </td> <td class="code"> <div class="highlight"><pre><span class="cm">/*</span>
<span class="cm"> node-http-proxy.js: Lookup table for proxy targets in node.js</span>

<span class="cm"> Copyright (c) 2010 Charlie Robbins </span>

<span class="cm"> Permission is hereby granted, free of charge, to any person obtaining</span>
<span class="cm"> a copy of this software and associated documentation files (the</span>
<span class="cm"> &quot;Software&quot;), to deal in the Software without restriction, including</span>
<span class="cm"> without limitation the rights to use, copy, modify, merge, publish,</span>
<span class="cm"> distribute, sublicense, and/or sell copies of the Software, and to</span>
<span class="cm"> permit persons to whom the Software is furnished to do so, subject to</span>
<span class="cm"> the following conditions:</span>

<span class="cm"> The above copyright notice and this permission notice shall be</span>
<span class="cm"> included in all copies or substantial portions of the Software.</span>

<span class="cm"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span>
<span class="cm"> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
<span class="cm"> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
<span class="cm"> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE</span>
<span class="cm"> LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION</span>
<span class="cm"> OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span>
<span class="cm"> WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>

<span class="cm">*/</span>

<span class="kd">var</span> <span class="nx">util</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;util&#39;</span><span class="p">),</span>
    <span class="nx">events</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;events&#39;</span><span class="p">),</span>
    <span class="nx">fs</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;fs&#39;</span><span class="p">);</span></pre></div> </td> </tr> <tr id="section-2"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-2">&#182;</a> </div> <h3>function ProxyTable (router, silent)</h3>

<h4>@router {Object} Object containing the host based routes</h4>

<h4>@silent {Boolean} Value indicating whether we should suppress logs</h4>

<h4>@hostnameOnly {Boolean} Value indicating if we should route based on <strong>hostname string only</strong></h4>

<p>Constructor function for the ProxyTable responsible for getting
locations of proxy targets based on ServerRequest headers; specifically
the HTTP host header.</p> </td> <td class="code"> <div class="highlight"><pre><span class="kd">var</span> <span class="nx">ProxyTable</span> <span class="o">=</span> <span class="nx">exports</span><span class="p">.</span><span class="nx">ProxyTable</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">router</span><span class="p">,</span> <span class="nx">silent</span><span class="p">,</span> <span class="nx">hostnameOnly</span><span class="p">)</span> <span class="p">{</span>
  <span class="nx">events</span><span class="p">.</span><span class="nx">EventEmitter</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
  
  <span class="k">this</span><span class="p">.</span><span class="nx">silent</span> <span class="o">=</span> <span class="k">typeof</span> <span class="nx">silent</span> <span class="o">!==</span> <span class="s1">&#39;undefined&#39;</span> <span class="o">?</span> <span class="nx">silent</span> <span class="o">:</span> <span class="kc">true</span><span class="p">;</span>
  <span class="k">this</span><span class="p">.</span><span class="nx">hostnameOnly</span> <span class="o">=</span> <span class="k">typeof</span> <span class="nx">hostnameOnly</span> <span class="o">!==</span> <span class="s1">&#39;undefined&#39;</span> <span class="o">?</span> <span class="nx">hostnameOnly</span> <span class="o">:</span> <span class="kc">false</span><span class="p">;</span>
  
  <span class="k">if</span> <span class="p">(</span><span class="k">typeof</span> <span class="nx">router</span> <span class="o">===</span> <span class="s1">&#39;object&#39;</span><span class="p">)</span> <span class="p">{</span></pre></div> </td> </tr> <tr id="section-3"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-3">&#182;</a> </div> <p>If we are passed an object literal setup
the routes with RegExps from the router </p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">this</span><span class="p">.</span><span class="nx">setRoutes</span><span class="p">(</span><span class="nx">router</span><span class="p">);</span>
  <span class="p">}</span>
  <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="k">typeof</span> <span class="nx">router</span> <span class="o">===</span> <span class="s1">&#39;string&#39;</span><span class="p">)</span> <span class="p">{</span></pre></div> </td> </tr> <tr id="section-4"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-4">&#182;</a> </div> <p>If we are passed a string then assume it is a
file path, parse that file and watch it for changes</p> </td> <td class="code"> <div class="highlight"><pre> <span class="kd">var</span> <span class="nx">self</span> <span class="o">=</span> <span class="k">this</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">routeFile</span> <span class="o">=</span> <span class="nx">router</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">setRoutes</span><span class="p">(</span><span class="nx">JSON</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">fs</span><span class="p">.</span><span class="nx">readFileSync</span><span class="p">(</span><span class="nx">router</span><span class="p">)).</span><span class="nx">router</span><span class="p">);</span>
    
    <span class="nx">fs</span><span class="p">.</span><span class="nx">watchFile</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">routeFile</span><span class="p">,</span> <span class="kd">function</span> <span class="p">()</span> <span class="p">{</span>
      <span class="nx">fs</span><span class="p">.</span><span class="nx">readFile</span><span class="p">(</span><span class="nx">self</span><span class="p">.</span><span class="nx">routeFile</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">data</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">if</span> <span class="p">(</span><span class="nx">err</span><span class="p">)</span> <span class="k">throw</span> <span class="nx">err</span><span class="p">;</span>
        <span class="nx">self</span><span class="p">.</span><span class="nx">setRoutes</span><span class="p">(</span><span class="nx">JSON</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">data</span><span class="p">).</span><span class="nx">router</span><span class="p">);</span>
        <span class="nx">self</span><span class="p">.</span><span class="nx">emit</span><span class="p">(</span><span class="s1">&#39;routes&#39;</span><span class="p">,</span> <span class="nx">self</span><span class="p">.</span><span class="nx">hostnameOnly</span> <span class="o">===</span> <span class="kc">false</span> <span class="o">?</span> <span class="nx">self</span><span class="p">.</span><span class="nx">routes</span> <span class="o">:</span> <span class="nx">self</span><span class="p">.</span><span class="nx">router</span><span class="p">);</span>
      <span class="p">});</span>
    <span class="p">});</span>
  <span class="p">}</span>
  <span class="k">else</span> <span class="p">{</span>
    <span class="k">throw</span> <span class="k">new</span> <span class="nb">Error</span><span class="p">(</span><span class="s1">&#39;Cannot parse router with unknown type: &#39;</span> <span class="o">+</span> <span class="k">typeof</span> <span class="nx">router</span><span class="p">);</span>
  <span class="p">}</span>
<span class="p">};</span></pre></div> </td> </tr> <tr id="section-5"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-5">&#182;</a> </div> <p>Inherit from events.EventEmitter</p> </td> <td class="code"> <div class="highlight"><pre><span class="nx">util</span><span class="p">.</span><span class="nx">inherits</span><span class="p">(</span><span class="nx">ProxyTable</span><span class="p">,</span> <span class="nx">events</span><span class="p">.</span><span class="nx">EventEmitter</span><span class="p">);</span></pre></div> </td> </tr> <tr id="section-6"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-6">&#182;</a> </div> <h3>function setRoutes (router)</h3>

<h4>@router {Object} Object containing the host based routes</h4>

<p>Sets the host-based routes to be used by this instance. </p> </td> <td class="code"> <div class="highlight"><pre><span class="nx">ProxyTable</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">setRoutes</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">router</span><span class="p">)</span> <span class="p">{</span>
  <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">router</span><span class="p">)</span> <span class="k">throw</span> <span class="k">new</span> <span class="nb">Error</span><span class="p">(</span><span class="s1">&#39;Cannot update ProxyTable routes without router.&#39;</span><span class="p">);</span>
  
  <span class="k">this</span><span class="p">.</span><span class="nx">router</span> <span class="o">=</span> <span class="nx">router</span><span class="p">;</span>
  
  <span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">hostnameOnly</span> <span class="o">===</span> <span class="kc">false</span><span class="p">)</span> <span class="p">{</span>
    <span class="kd">var</span> <span class="nx">self</span> <span class="o">=</span> <span class="k">this</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">routes</span> <span class="o">=</span> <span class="p">[];</span>

    <span class="nb">Object</span><span class="p">.</span><span class="nx">keys</span><span class="p">(</span><span class="nx">router</span><span class="p">).</span><span class="nx">forEach</span><span class="p">(</span><span class="kd">function</span> <span class="p">(</span><span class="nx">path</span><span class="p">)</span> <span class="p">{</span>
      <span class="kd">var</span> <span class="nx">route</span> <span class="o">=</span> <span class="k">new</span> <span class="nb">RegExp</span><span class="p">(</span><span class="nx">path</span><span class="p">,</span> <span class="s1">&#39;i&#39;</span><span class="p">);</span>

      <span class="nx">self</span><span class="p">.</span><span class="nx">routes</span><span class="p">.</span><span class="nx">push</span><span class="p">({</span>
        <span class="nx">route</span><span class="o">:</span> <span class="nx">route</span><span class="p">,</span>
        <span class="nx">target</span><span class="o">:</span> <span class="nx">router</span><span class="p">[</span><span class="nx">path</span><span class="p">]</span>
      <span class="p">});</span>
    <span class="p">});</span>
  <span class="p">}</span>
<span class="p">};</span></pre></div> </td> </tr> <tr id="section-7"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-7">&#182;</a> </div> <h3>function getProxyLocation (req)</h3>

<h4>@req {ServerRequest} The incoming server request to get proxy information about.</h4>

<p>Returns the proxy location based on the HTTP Headers in the ServerRequest <code>req</code>
available to this instance.</p> </td> <td class="code"> <div class="highlight"><pre><span class="nx">ProxyTable</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">getProxyLocation</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">req</span><span class="p">)</span> <span class="p">{</span>
  <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">req</span> <span class="o">||</span> <span class="o">!</span><span class="nx">req</span><span class="p">.</span><span class="nx">headers</span> <span class="o">||</span> <span class="o">!</span><span class="nx">req</span><span class="p">.</span><span class="nx">headers</span><span class="p">.</span><span class="nx">host</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">return</span> <span class="kc">null</span><span class="p">;</span>
  <span class="p">}</span>
  
  <span class="kd">var</span> <span class="nx">target</span> <span class="o">=</span> <span class="nx">req</span><span class="p">.</span><span class="nx">headers</span><span class="p">.</span><span class="nx">host</span><span class="p">.</span><span class="nx">split</span><span class="p">(</span><span class="s1">&#39;:&#39;</span><span class="p">)[</span><span class="mi">0</span><span class="p">];</span>
  <span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">hostnameOnly</span> <span class="o">==</span> <span class="kc">true</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">router</span><span class="p">.</span><span class="nx">hasOwnProperty</span><span class="p">(</span><span class="nx">target</span><span class="p">))</span> <span class="p">{</span>
      <span class="kd">var</span> <span class="nx">location</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">router</span><span class="p">[</span><span class="nx">target</span><span class="p">].</span><span class="nx">split</span><span class="p">(</span><span class="s1">&#39;:&#39;</span><span class="p">),</span>
          <span class="nx">host</span> <span class="o">=</span> <span class="nx">location</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span>
          <span class="nx">port</span> <span class="o">=</span> <span class="nx">location</span><span class="p">.</span><span class="nx">length</span> <span class="o">===</span> <span class="mi">1</span> <span class="o">?</span> <span class="mi">80</span> <span class="o">:</span> <span class="nx">location</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span>
      
      <span class="k">return</span> <span class="p">{</span>
        <span class="nx">port</span><span class="o">:</span> <span class="nx">port</span><span class="p">,</span>
        <span class="nx">host</span><span class="o">:</span> <span class="nx">host</span>
      <span class="p">};</span>
    <span class="p">}</span>
  <span class="p">}</span>
  <span class="k">else</span> <span class="p">{</span>
    <span class="nx">target</span> <span class="o">+=</span> <span class="nx">req</span><span class="p">.</span><span class="nx">url</span><span class="p">;</span>
    <span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">i</span> <span class="k">in</span> <span class="k">this</span><span class="p">.</span><span class="nx">routes</span><span class="p">)</span> <span class="p">{</span>
      <span class="kd">var</span> <span class="nx">match</span><span class="p">,</span> <span class="nx">route</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">routes</span><span class="p">[</span><span class="nx">i</span><span class="p">];</span>
      <span class="k">if</span> <span class="p">(</span><span class="nx">match</span> <span class="o">=</span> <span class="nx">target</span><span class="p">.</span><span class="nx">match</span><span class="p">(</span><span class="nx">route</span><span class="p">.</span><span class="nx">route</span><span class="p">))</span> <span class="p">{</span>
        <span class="kd">var</span> <span class="nx">location</span> <span class="o">=</span> <span class="nx">route</span><span class="p">.</span><span class="nx">target</span><span class="p">.</span><span class="nx">split</span><span class="p">(</span><span class="s1">&#39;:&#39;</span><span class="p">),</span>
            <span class="nx">host</span> <span class="o">=</span> <span class="nx">location</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span>
            <span class="nx">port</span> <span class="o">=</span> <span class="nx">location</span><span class="p">.</span><span class="nx">length</span> <span class="o">===</span> <span class="mi">1</span> <span class="o">?</span> <span class="mi">80</span> <span class="o">:</span> <span class="nx">location</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span>

        <span class="k">return</span> <span class="p">{</span>
          <span class="nx">port</span><span class="o">:</span> <span class="nx">port</span><span class="p">,</span>
          <span class="nx">host</span><span class="o">:</span> <span class="nx">host</span>
        <span class="p">};</span>
      <span class="p">}</span>
    <span class="p">}</span>
  <span class="p">}</span>
  
  <span class="k">return</span> <span class="kc">null</span><span class="p">;</span>
<span class="p">};</span></pre></div> </td> </tr> <tr id="section-8"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-8">&#182;</a> </div> <h3>close function ()</h3>

<p>Cleans up the event listeneners maintained
by this instance.</p> </td> <td class="code"> <div class="highlight"><pre><span class="nx">ProxyTable</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">close</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">()</span> <span class="p">{</span>
  <span class="k">if</span> <span class="p">(</span><span class="k">typeof</span> <span class="k">this</span><span class="p">.</span><span class="nx">routeFile</span> <span class="o">===</span> <span class="s1">&#39;string&#39;</span><span class="p">)</span> <span class="p">{</span>
    <span class="nx">fs</span><span class="p">.</span><span class="nx">unwatchFile</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">routeFile</span><span class="p">);</span>
  <span class="p">}</span>
<span class="p">};</span>

</pre></div> </td> </tr> </tbody> </table> </div> </body> </html>
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