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<!DOCTYPE html>
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<head>
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<title>Bref. Une API Zia - Documentation - Implémenter un module</title>
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<li><a href="index.html">Accueil</a></li>
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<div class="container doc-exemple">
<header class="jumbotron subhead" id="overview">
<h1>Exemple : ModRewrite.cpp</h1>
</header>
<div class='clearall example-wrapper'>
<div class="background"></div>
<div class='row' id='section-0'>
<div class='span6 example-doc-text'>
<h2><span id="introduction" href="introduction"> Introduction </span></h2>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-1'>
<div class='span6 example-doc-text'>
<p>Ce module est écrit dans un seul fichier, pas de séparations entre
déclarations et définitions pour simplifier la démonstration. Il
montre un usage basique de l'API Bref. Le module écrit est très
simple dans son fonctionnement et vise surtout à expliquer les
notions basiques de l'écriture d'un module.</p>
<p>Cet exemple est présenté sous forme de <em>literate programming</em>,
avec en parallèle le code et son explication. Il présente
l'écriture d'un module simple d'<a href="http://en.wikipedia.org/wiki/Rewrite_engine">URL
rewriting</a>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-2'>
<div class='span6 example-doc-text'>
<h3><span id="note-préliminaire" href="note-préliminaire"> Note préliminaire </span></h3>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-3'>
<div class='span6 example-doc-text'>
<p>Vous pourrez constater que <strong>nous n'avons pas choisi de faire un
module qui s'écrit en 2 lignes</strong>, mais plutôt d'essayer de faire
quelque chose d'un peu plus <strong>réaliste</strong> en forçant la définition
d'une version, d'une description, etc. Cela coûte 2 minutes de plus
à écrire, mais permettra aux serveurs qui le désirent de fournir
certaines fonctionnalitées un peu plus avancées dans la gestion des
modules.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-4'>
<div class='span6 example-doc-text'>
<h2><span id="code" href="code"> Code </span></h2>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-5'>
<div class='span6 example-doc-text'>
<p>Chaque module doit hériter de l'abstraction
<a href="http://bref.github.com/doxygen/classbref_1_1_a_module.html">AModule</a>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre><span class="cp">#include "bref/AModule.h"</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-6'>
<div class='span6 example-doc-text'>
<p>Utile pour le l'utilisation de d'<code>ostream</code> pour le logging.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre><span class="cp">#include "bref/ScopedLogger.h"</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-7'>
<div class='span6 example-doc-text'>
<p>Prototype du handler pour la ré-écriture d'URL (voir: <a href="documentation-example-ModRewrite.html#code-de-rewriting">ModRewrite</a>).</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre><span class="n">bref</span><span class="o">::</span><span class="n">Pipeline</span><span class="o">::</span><span class="n">PostParsingRequestHandler</span>
<span class="n">rewriteURLHook</span><span class="p">(</span><span class="k">const</span> <span class="n">bref</span><span class="o">::</span><span class="n">Environment</span> <span class="o">&</span><span class="p">,</span> <span class="n">bref</span><span class="o">::</span><span class="n">HttpRequest</span> <span class="o">&</span><span class="p">,</span> <span class="n">bref</span><span class="o">::</span><span class="n">HttpResponse</span> <span class="o">&</span><span class="p">);</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-8'>
<div class='span6 example-doc-text'>
<p>Nous déclarons ici une classe héritant de l'abstraction AModule,
cette classe sera instanciée un peu plus bas dans la fonction
<a href="documentation-example-ModRewrite.html#enregistrement-du-module">loadModule()</a>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre><span class="k">class</span> <span class="nc">ModRewrite</span> <span class="o">:</span> <span class="k">public</span> <span class="n">bref</span><span class="o">::</span><span class="n">AModule</span>
<span class="p">{</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-9'>
<div class='span6 example-doc-text'>
<p>Déclaration des variables internes au module</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre><span class="k">private</span><span class="o">:</span>
<span class="k">const</span> <span class="kt">float</span> <span class="n">priority_</span><span class="p">;</span>
<span class="k">public</span><span class="o">:</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-10'>
<div class='span6 example-doc-text'>
<p>Définition des variables.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="n">ModRewrite</span><span class="p">()</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-11'>
<div class='span6 example-doc-text'>
<p>On définit ici les propriétés du module : nom, description, version et version de utilisée
de l'API.</p>
<p>Vous pouvez retrouver la dernière version de l'API
<a href="https://github.com/bref/bref-api/tags">ici</a>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="o">:</span> <span class="n">AModule</span><span class="p">(</span><span class="s">"mod_rewrite"</span><span class="p">,</span> <span class="s">"A simple URL-rewrite module"</span><span class="p">,</span> <span class="n">bref</span><span class="o">::</span><span class="n">Version</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span> <span class="n">bref</span><span class="o">::</span><span class="n">Version</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-12'>
<div class='span6 example-doc-text'>
<p>Si on regarde dans le doxygen <a href="http://bref.github.com/doxygen/group___pipeline.html">la partie sur la
priorité</a>
on mets ici une priorité normale. La ré-écriture d'URL ne
semble pas avoir besoin d'être fait en priorité par rapport à
un autre module.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="p">,</span> <span class="n">priority_</span><span class="p">(</span><span class="mf">0.5</span><span class="p">)</span>
<span class="p">{</span> <span class="p">}</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-13'>
<div class='span6 example-doc-text'>
<p>Cette méthode permet de libérer un module alloué dans une
librarie dynamique. Lorsque l'allocation (<code>new</code>) a été effectuée
dans une librarie dynamique, il est nécessaire que la libération
de la mémoire (<code>delete</code>) y soit aussi effectuée. Comme expliqué
dans <a href="http://bref.github.com/doxygen/classbref_1_1_a_module.html">le doxygen d'AModule</a>
cette méthode est souvent représentée par un body contenant
<code>delete this;</code></p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="k">virtual</span> <span class="kt">void</span> <span class="n">dispose</span><span class="p">()</span>
<span class="p">{</span>
<span class="k">delete</span> <span class="k">this</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">virtual</span> <span class="o">~</span><span class="n">ModRewrite</span><span class="p">()</span>
<span class="p">{</span> <span class="p">}</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-14'>
<div class='span6 example-doc-text'>
<h3><span id="enregistrement-du-hook" href="enregistrement-du-hook"> Enregistrement du hook </span></h3>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-15'>
<div class='span6 example-doc-text'>
<p>On souhaite faire un module d'URL rewrite, l'endroit parfait pour
faire ça, si on regarde <a href="./documentation-intro.html">le schéma de la
Pipeline</a> est le
<a href="./doxygen/group___upstream.html#ga5af7ca7c7f953a8f0f7292b0a71443f0">PostParsingHook</a></p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="k">virtual</span> <span class="kt">void</span> <span class="n">registerHooks</span><span class="p">(</span><span class="n">bref</span><span class="o">::</span><span class="n">Pipeline</span> <span class="o">&</span> <span class="n">pipeline</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">pipeline</span><span class="p">.</span><span class="n">postParsingHooks</span><span class="p">.</span><span class="n">push_back</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">make_pair</span><span class="p">(</span><span class="o">&</span><span class="n">rewriteURLHook</span><span class="p">,</span>
<span class="n">priority_</span><span class="p">));</span>
<span class="p">}</span>
<span class="p">};</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-16'>
<div class='span6 example-doc-text'>
<h2><span id="code-de-rewriting" href="code-de-rewriting"> Code de rewriting </span></h2>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-17'>
<div class='span6 example-doc-text'>
<p>Ce module d'URL change l'extension d'un fichier dans l'url, à l'origine en
<code>.html</code> en un fichier <code>.php</code>. Si l'on souhaite faire un vrai module
d'URL rewrite il faudrait probablement se baser sur la
configuration présente dans l'<code>Environment</code>. Et il faudrait aussi
faire attention à ne pas prendre les paramètres d'un GET ou autre,
ce n'est pas l'objectif de cet exemple.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre><span class="n">bref</span><span class="o">::</span><span class="n">Pipeline</span><span class="o">::</span><span class="n">PostParsingRequestHandler</span>
<span class="n">rewriteURLHook</span><span class="p">(</span><span class="k">const</span> <span class="n">bref</span><span class="o">::</span><span class="n">Environment</span> <span class="o">&</span> <span class="cm">/* environment */</span><span class="p">,</span>
<span class="n">bref</span><span class="o">::</span><span class="n">HttpRequest</span> <span class="o">&</span> <span class="n">httpRequest</span><span class="p">,</span>
<span class="n">bref</span><span class="o">::</span><span class="n">HttpResponse</span> <span class="o">&</span> <span class="cm">/* response */</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="o">&</span> <span class="n">uri</span> <span class="o">=</span> <span class="n">httpRequest</span><span class="p">.</span><span class="n">getUri</span><span class="p">();</span>
<span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">size_t</span> <span class="n">extSize</span> <span class="o">=</span> <span class="k">sizeof</span> <span class="s">".html"</span> <span class="o">-</span> <span class="mi">1</span><span class="p">;</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-18'>
<div class='span6 example-doc-text'>
<p>Vérification de l'extension <code>.html</code>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="k">if</span> <span class="p">(</span><span class="n">uri</span><span class="p">.</span><span class="n">length</span><span class="p">()</span> <span class="o">>=</span> <span class="n">extSize</span> <span class="o">&&</span>
<span class="o">!</span> <span class="n">uri</span><span class="p">.</span><span class="n">compare</span><span class="p">(</span><span class="n">uri</span><span class="p">.</span><span class="n">length</span><span class="p">()</span> <span class="o">-</span> <span class="n">extSize</span><span class="p">,</span> <span class="n">extSize</span><span class="p">,</span> <span class="s">".html"</span><span class="p">))</span> <span class="p">{</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-19'>
<div class='span6 example-doc-text'>
<p>Suppression de l'extension <code>.html</code>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">newUri</span><span class="p">(</span><span class="n">uri</span><span class="p">.</span><span class="n">begin</span><span class="p">(),</span> <span class="n">uri</span><span class="p">.</span><span class="n">end</span><span class="p">()</span> <span class="o">-</span> <span class="n">extSize</span><span class="p">);</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-20'>
<div class='span6 example-doc-text'>
<p>Ajout de l'extension <code>.php</code>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="n">newUri</span> <span class="o">+=</span> <span class="s">".php"</span><span class="p">;</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-21'>
<div class='span6 example-doc-text'>
<p>On modifie le header avec la nouvelle adresse.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="n">httpRequest</span><span class="p">.</span><span class="n">setUri</span><span class="p">(</span><span class="n">newUri</span><span class="p">);</span>
<span class="p">}</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-22'>
<div class='span6 example-doc-text'>
<p>On a fait tout ce qu'on avait à faire, le body de la requête ne
nous intéresse pas, on retourne donc un handler vide.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="k">return</span> <span class="n">bref</span><span class="o">::</span><span class="n">Pipeline</span><span class="o">::</span><span class="n">PostParsingRequestHandler</span><span class="p">();</span>
<span class="p">}</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-23'>
<div class='span6 example-doc-text'>
<h2><span id="enregistrement-du-module" href="enregistrement-du-module"> Enregistrement du module </span></h2>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-24'>
<div class='span6 example-doc-text'>
<p>Cette fonction est la méthode d'entrée d'un module, elle permettra
au serveur d'avoir une instance du module. Certains modules peuvent
nécessiter l'accès à la configuration du server pour se loader,
c'est pourquoi on envoie en paramètre un <code>ServerConfig</code> et
<code>IConfHelper</code>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre><span class="k">extern</span> <span class="s">"C"</span> <span class="n">BREF_DLL</span>
<span class="n">bref</span><span class="o">::</span><span class="n">AModule</span> <span class="o">*</span><span class="n">loadModule</span><span class="p">(</span><span class="n">bref</span><span class="o">::</span><span class="n">ILogger</span> <span class="o">*</span><span class="n">logger</span><span class="p">,</span>
<span class="k">const</span> <span class="n">bref</span><span class="o">::</span><span class="n">ServerConfig</span> <span class="o">&</span><span class="p">,</span>
<span class="k">const</span> <span class="n">bref</span><span class="o">::</span><span class="n">IConfHelper</span> <span class="o">&</span><span class="p">)</span>
<span class="p">{</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='row' id='section-25'>
<div class='span6 example-doc-text'>
<p>Voir les macros de logging <a href="/doxygen/_scoped_logger_8h.html">sur le
doxygen</a>.</p>
</div>
<div class='span6 example-doc-code'>
<div class="highlight"><pre> <span class="n">LOG_DEBUG</span><span class="p">(</span><span class="n">logger</span><span class="p">)</span> <span class="o"><<</span> <span class="s">"Loading URL rewrite module"</span><span class="p">;</span>
<span class="k">return</span> <span class="k">new</span> <span class="n">ModRewrite</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
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