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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>class Rack::Session::Cookie - rack-2.2.3 Documentation</title> <script type="text/javascript"> var rdoc_rel_prefix = "../../"; var index_rel_prefix = "../../"; </script> <script src="../../js/navigation.js" defer></script> <script src="../../js/search.js" defer></script> <script src="../../js/search_index.js" defer></script> <script src="../../js/searcher.js" defer></script> <script src="../../js/darkfish.js" defer></script> <link href="../../css/fonts.css" rel="stylesheet"> <link href="../../css/rdoc.css" rel="stylesheet"> <body id="top" role="document" class="class"> <nav role="navigation"> <div id="project-navigation"> <div id="home-section" role="region" title="Quick navigation" class="nav-section"> <h2> <a href="../../index.html" rel="home">Home</a> </h2> <div id="table-of-contents-navigation"> <a href="../../table_of_contents.html#pages">Pages</a> <a href="../../table_of_contents.html#classes">Classes</a> <a href="../../table_of_contents.html#methods">Methods</a> </div> </div> <div id="search-section" role="search" class="project-section initially-hidden"> <form action="#" method="get" accept-charset="utf-8"> <div id="search-field-wrapper"> <input id="search-field" role="combobox" aria-label="Search" aria-autocomplete="list" aria-controls="search-results" type="text" name="search" placeholder="Search" spellcheck="false" title="Type to search, Up and Down to navigate, Enter to load"> </div> <ul id="search-results" aria-label="Search Results" aria-busy="false" aria-expanded="false" aria-atomic="false" class="initially-hidden"></ul> </form> </div> </div> <div id="class-metadata"> <div id="parent-class-section" class="nav-section"> <h3>Parent</h3> <p class="link"><a href="Abstract/PersistedSecure.html">Rack::Session::Abstract::PersistedSecure</a> </div> <!-- Method Quickref --> <div id="method-list-section" class="nav-section"> <h3>Methods</h3> <ul class="link-list" role="directory"> <li class="calls-super" ><a href="#method-c-new">::new</a> <li ><a href="#method-i-delete_session">#delete_session</a> <li ><a href="#method-i-digest_match-3F">#digest_match?</a> <li ><a href="#method-i-extract_session_id">#extract_session_id</a> <li ><a href="#method-i-find_session">#find_session</a> <li ><a href="#method-i-generate_hmac">#generate_hmac</a> <li ><a href="#method-i-persistent_session_id-21">#persistent_session_id!</a> <li ><a href="#method-i-secure-3F">#secure?</a> <li ><a href="#method-i-unpacked_cookie_data">#unpacked_cookie_data</a> <li ><a href="#method-i-write_session">#write_session</a> </ul> </div> </div> </nav> <main role="main" aria-labelledby="class-Rack::Session::Cookie"> <h1 id="class-Rack::Session::Cookie" class="class"> class Rack::Session::Cookie </h1> <section class="description"> <p><a href="Cookie.html">Rack::Session::Cookie</a> provides simple cookie based session management. By default, the session is a Ruby Hash stored as base64 encoded marshalled data set to :key (default: rack.session). The object that encodes the session data is configurable and must respond to <code>encode</code> and <code>decode</code>. Both methods must take a string and return a string.</p> <p>When the secret key is set, cookie data is checked for data integrity. The old secret key is also accepted and allows graceful secret rotation.</p> <p>Example:</p> <pre>use Rack::Session::Cookie, :key =&gt; &#39;rack.session&#39;, :domain =&gt; &#39;foo.com&#39;, :path =&gt; &#39;/&#39;, :expire_after =&gt; 2592000, :secret =&gt; &#39;change_me&#39;, :old_secret =&gt; &#39;also_change_me&#39; All parameters are optional.</pre> <p>Example of a cookie with no encoding:</p> <pre class="ruby"><span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Session</span><span class="ruby-operator">::</span><span class="ruby-constant">Cookie</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">application</span>, { :<span class="ruby-identifier">coder</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Session</span><span class="ruby-operator">::</span><span class="ruby-constant">Cookie</span><span class="ruby-operator">::</span><span class="ruby-constant">Identity</span>.<span class="ruby-identifier">new</span> }) </pre> <p>Example of a cookie with custom encoding:</p> <pre class="ruby"><span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Session</span><span class="ruby-operator">::</span><span class="ruby-constant">Cookie</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">application</span>, { :<span class="ruby-identifier">coder</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-constant">Class</span>.<span class="ruby-identifier">new</span> { <span class="ruby-keyword">def</span> <span class="ruby-identifier">encode</span>(<span class="ruby-identifier">str</span>); <span class="ruby-identifier">str</span>.<span class="ruby-identifier">reverse</span>; <span class="ruby-keyword">end</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">decode</span>(<span class="ruby-identifier">str</span>); <span class="ruby-identifier">str</span>.<span class="ruby-identifier">reverse</span>; <span class="ruby-keyword">end</span> }.<span class="ruby-identifier">new</span> }) </pre> </section> <section id="5Buntitled-5D" class="documentation-section"> <section class="attribute-method-details" class="method-section"> <header> <h3>Attributes</h3> </header> <div id="attribute-i-coder" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">coder</span><span class="attribute-access-type">[R]</span> </div> <div class="method-description"> </div> </div> </section> <section id="public-class-5Buntitled-5D-method-details" class="method-section"> <header> <h3>Public Class Methods</h3> </header> <div id="method-c-new" class="method-detail "> <div class="method-heading"> <span class="method-name">new</span><span class="method-args">(app, options = {})</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-calls-super"> Calls superclass method <a href="Abstract/Persisted.html#method-c-new">Rack::Session::Abstract::Persisted.new</a> </div> <div class="method-source-code" id="new-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 106</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">app</span>, <span class="ruby-identifier">options</span> = {}) <span class="ruby-ivar">@secrets</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">values_at</span>(<span class="ruby-value">:secret</span>, <span class="ruby-value">:old_secret</span>).<span class="ruby-identifier">compact</span> <span class="ruby-ivar">@hmac</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-value">:hmac</span>, <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">Digest</span><span class="ruby-operator">::</span><span class="ruby-constant">SHA1</span>) <span class="ruby-identifier">warn</span> <span class="ruby-string">&quot; SECURITY WARNING: No secret option provided to Rack::Session::Cookie. This poses a security threat. It is strongly recommended that you provide a secret to prevent exploits that may be possible from crafted cookies. This will not be supported in future versions of Rack, and future versions will even invalidate your existing user cookies. Called from: #{caller[0]}. &quot;</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">secure?</span>(<span class="ruby-identifier">options</span>) <span class="ruby-ivar">@coder</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:coder</span>] <span class="ruby-operator">||=</span> <span class="ruby-constant">Base64</span><span class="ruby-operator">::</span><span class="ruby-constant">Marshal</span>.<span class="ruby-identifier">new</span> <span class="ruby-keyword">super</span>(<span class="ruby-identifier">app</span>, <span class="ruby-identifier">options</span>.<span class="ruby-identifier">merge!</span>(<span class="ruby-identifier">cookie_only</span><span class="ruby-operator">:</span> <span class="ruby-keyword">true</span>)) <span class="ruby-keyword">end</span></pre> </div> </div> </div> </section> <section id="private-instance-5Buntitled-5D-method-details" class="method-section"> <header> <h3>Private Instance Methods</h3> </header> <div id="method-i-delete_session" class="method-detail "> <div class="method-heading"> <span class="method-name">delete_session</span><span class="method-args">(req, session_id, options)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="delete_session-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 179</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">delete_session</span>(<span class="ruby-identifier">req</span>, <span class="ruby-identifier">session_id</span>, <span class="ruby-identifier">options</span>) <span class="ruby-comment"># Nothing to do here, data is in the client</span> <span class="ruby-identifier">generate_sid</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:drop</span>] <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-digest_match-3F" class="method-detail "> <div class="method-heading"> <span class="method-name">digest_match?</span><span class="method-args">(data, digest)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="digest_match-3F-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 184</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">digest_match?</span>(<span class="ruby-identifier">data</span>, <span class="ruby-identifier">digest</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">data</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">digest</span> <span class="ruby-ivar">@secrets</span>.<span class="ruby-identifier">any?</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">secret</span><span class="ruby-operator">|</span> <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Utils</span>.<span class="ruby-identifier">secure_compare</span>(<span class="ruby-identifier">digest</span>, <span class="ruby-identifier">generate_hmac</span>(<span class="ruby-identifier">data</span>, <span class="ruby-identifier">secret</span>)) <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-extract_session_id" class="method-detail "> <div class="method-heading"> <span class="method-name">extract_session_id</span><span class="method-args">(request)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="extract_session_id-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 131</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">extract_session_id</span>(<span class="ruby-identifier">request</span>) <span class="ruby-identifier">unpacked_cookie_data</span>(<span class="ruby-identifier">request</span>)[<span class="ruby-string">&quot;session_id&quot;</span>] <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-find_session" class="method-detail "> <div class="method-heading"> <span class="method-name">find_session</span><span class="method-args">(req, sid)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="find_session-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 125</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">find_session</span>(<span class="ruby-identifier">req</span>, <span class="ruby-identifier">sid</span>) <span class="ruby-identifier">data</span> = <span class="ruby-identifier">unpacked_cookie_data</span>(<span class="ruby-identifier">req</span>) <span class="ruby-identifier">data</span> = <span class="ruby-identifier">persistent_session_id!</span>(<span class="ruby-identifier">data</span>) [<span class="ruby-identifier">data</span>[<span class="ruby-string">&quot;session_id&quot;</span>], <span class="ruby-identifier">data</span>] <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-generate_hmac" class="method-detail "> <div class="method-heading"> <span class="method-name">generate_hmac</span><span class="method-args">(data, secret)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="generate_hmac-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 191</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">generate_hmac</span>(<span class="ruby-identifier">data</span>, <span class="ruby-identifier">secret</span>) <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">HMAC</span>.<span class="ruby-identifier">hexdigest</span>(<span class="ruby-ivar">@hmac</span>.<span class="ruby-identifier">new</span>, <span class="ruby-identifier">secret</span>, <span class="ruby-identifier">data</span>) <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-persistent_session_id-21" class="method-detail "> <div class="method-heading"> <span class="method-name">persistent_session_id!</span><span class="method-args">(data, sid = nil)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="persistent_session_id-21-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 148</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">persistent_session_id!</span>(<span class="ruby-identifier">data</span>, <span class="ruby-identifier">sid</span> = <span class="ruby-keyword">nil</span>) <span class="ruby-identifier">data</span> <span class="ruby-operator">||=</span> {} <span class="ruby-identifier">data</span>[<span class="ruby-string">&quot;session_id&quot;</span>] <span class="ruby-operator">||=</span> <span class="ruby-identifier">sid</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">generate_sid</span> <span class="ruby-identifier">data</span> <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-secure-3F" class="method-detail "> <div class="method-heading"> <span class="method-name">secure?</span><span class="method-args">(options)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="secure-3F-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 195</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">secure?</span>(<span class="ruby-identifier">options</span>) <span class="ruby-ivar">@secrets</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-value">1</span> <span class="ruby-operator">||</span> (<span class="ruby-identifier">options</span>[<span class="ruby-value">:coder</span>] <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:let_coder_handle_secure_encoding</span>]) <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-unpacked_cookie_data" class="method-detail "> <div class="method-heading"> <span class="method-name">unpacked_cookie_data</span><span class="method-args">(request)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="unpacked_cookie_data-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 135</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">unpacked_cookie_data</span>(<span class="ruby-identifier">request</span>) <span class="ruby-identifier">request</span>.<span class="ruby-identifier">fetch_header</span>(<span class="ruby-constant">RACK_SESSION_UNPACKED_COOKIE_DATA</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">k</span><span class="ruby-operator">|</span> <span class="ruby-identifier">session_data</span> = <span class="ruby-identifier">request</span>.<span class="ruby-identifier">cookies</span>[<span class="ruby-ivar">@key</span>] <span class="ruby-keyword">if</span> <span class="ruby-ivar">@secrets</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">0</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">session_data</span> <span class="ruby-identifier">session_data</span>, <span class="ruby-identifier">_</span>, <span class="ruby-identifier">digest</span> = <span class="ruby-identifier">session_data</span>.<span class="ruby-identifier">rpartition</span>(<span class="ruby-string">&#39;--&#39;</span>) <span class="ruby-identifier">session_data</span> = <span class="ruby-keyword">nil</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">digest_match?</span>(<span class="ruby-identifier">session_data</span>, <span class="ruby-identifier">digest</span>) <span class="ruby-keyword">end</span> <span class="ruby-identifier">request</span>.<span class="ruby-identifier">set_header</span>(<span class="ruby-identifier">k</span>, <span class="ruby-identifier">coder</span>.<span class="ruby-identifier">decode</span>(<span class="ruby-identifier">session_data</span>) <span class="ruby-operator">||</span> {}) <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-write_session" class="method-detail "> <div class="method-heading"> <span class="method-name">write_session</span><span class="method-args">(req, session_id, session, options)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="write_session-source"> <pre><span class="ruby-comment"># File lib/rack/session/cookie.rb, line 163</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">write_session</span>(<span class="ruby-identifier">req</span>, <span class="ruby-identifier">session_id</span>, <span class="ruby-identifier">session</span>, <span class="ruby-identifier">options</span>) <span class="ruby-identifier">session</span> = <span class="ruby-identifier">session</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-string">&quot;session_id&quot;</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">session_id</span>) <span class="ruby-identifier">session_data</span> = <span class="ruby-identifier">coder</span>.<span class="ruby-identifier">encode</span>(<span class="ruby-identifier">session</span>) <span class="ruby-keyword">if</span> <span class="ruby-ivar">@secrets</span>.<span class="ruby-identifier">first</span> <span class="ruby-identifier">session_data</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-node">&quot;--#{generate_hmac(session_data, @secrets.first)}&quot;</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">session_data</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">&gt;</span> (<span class="ruby-value">4096</span> <span class="ruby-operator">-</span> <span class="ruby-ivar">@key</span>.<span class="ruby-identifier">size</span>) <span class="ruby-identifier">req</span>.<span class="ruby-identifier">get_header</span>(<span class="ruby-constant">RACK_ERRORS</span>).<span class="ruby-identifier">puts</span>(<span class="ruby-string">&quot;Warning! Rack::Session::Cookie data size exceeds 4K.&quot;</span>) <span class="ruby-keyword">nil</span> <span class="ruby-keyword">else</span> <span class="ruby-constant">SessionId</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">session_id</span>, <span class="ruby-identifier">session_data</span>) <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span></pre> </div> </div> </div> </section> </section> </main> <footer id="validator-badges" role="contentinfo"> <p><a href="http://validator.w3.org/check/referer">Validate</a> <p>Generated by <a href="https://rdoc.github.io/rdoc">RDoc</a> 5.0.1. <p>Based on <a href="http://deveiate.org/projects/Darkfish-RDoc/">Darkfish</a> by <a href="http://deveiate.org">Michael Granger</a>. </footer>