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<div id="content"><div id='filecontents'><h1 id='omniauth_standardized_multiprovider_authentication'>OmniAuth: Standardized Multi-Provider Authentication</h1>
<p>OmniAuth is a new Rack-based authentication system for multi-provider external authentcation. OmniAuth is built from the ground up on the philosophy that <strong>authentication is not the same as identity</strong>, and is based on two observations:</p>
<ol>
<li>The traditional &#8216;sign up using a login and password&#8217; model is becoming the exception, not the rule. Modern web applications offer external authentication via OpenID, Facebook, and/or OAuth.</li>
<li>The interconnectable web is no longer a dream, it is a necessity. It is not unreasonable to expect that one application may need to be able to connect to one, three, or twelve other services. Modern authentication systems should allow a user&#8217;s identity to be associated with many authentications.</li>
</ol>
<h2 id='installation'>Installation</h2>
<p>To install OmniAuth, simply install the gem:</p>
<pre class="code"><span class='gem identifier id'>gem</span> <span class='install identifier id'>install</span> <span class='omniauth identifier id'>omniauth</span>
</pre>
<h2 id='providers'>Providers</h2>
<p>OmniAuth currently supports the following external providers:</p>
<ul>
<li>
<p>via OAuth</p>
<ul>
<li>Facebook</li>
<li>Twitter</li>
<li>37signals ID</li>
<li>Foursquare</li>
<li>LinkedIn</li>
<li>GitHub</li>
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<li>Identi.ca (credit: <a href='http://github.com/dcu'>dcu</a>)</li>
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<li>Gowalla (credit: <a href='http://github.com/kvnsmth'>kvnsmth</a>)</li>
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<li>Dopplr (credit: <a href='http://github.com/flextrip'>flextrip</a>)</li>
<li>TripIt (credit: <a href='http://github.com/flextrip'>flextrip</a>)</li>
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</ul>
</li>
<li>
<p>OpenID</p>
</li>
<li>
<p>Google Apps (via OpenID)</p>
</li>
<li>
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<p>CAS (Central Authentication Service) (credit: <a href='http://github.com/jamesarosen'>jamesarosen</a>)</p>
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</li>
<li>
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<p>LDAP (credit: <strong>Ping Yu</strong>)</p>
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</li>
</ul>
<h2 id='usage'>Usage</h2>
<p>OmniAuth is a collection of Rack middleware. To use a single strategy, you simply need to add the middleware:</p>
<pre class="code"><span class='require identifier id'>require</span> <span class='string val'>'oa-oauth'</span>
<span class='use identifier id'>use</span> <span class='OmniAuth constant id'>OmniAuth</span><span class='colon2 op'>::</span><span class='Strategies constant id'>Strategies</span><span class='colon2 op'>::</span><span class='Twitter constant id'>Twitter</span><span class='comma token'>,</span> <span class='string val'>'CONSUMER_KEY'</span><span class='comma token'>,</span> <span class='string val'>'CONSUMER_SECRET'</span>
</pre>
<p>Now to initiate authentication you merely need to redirect the user to <code>/auth/twitter</code> via a link or other means. Once the user has authenticated to Twitter, they will be redirected to <code>/auth/twitter/callback</code>. You should build an endpoint that handles this URL, at which point you will will have access to the authentication information through the <code>omniauth.auth</code> parameter of the Rack environment. For example, in Sinatra you would do something like this:</p>
<pre class="code"><span class='get identifier id'>get</span> <span class='string val'>'/auth/twitter/callback'</span> <span class='do do kw'>do</span>
<span class='auth_hash identifier id'>auth_hash</span> <span class='assign token'>=</span> <span class='request identifier id'>request</span><span class='dot token'>.</span><span class='env identifier id'>env</span><span class='lbrack token'>[</span><span class='string val'>'omniauth.auth'</span><span class='rbrack token'>]</span>
<span class='end end kw'>end</span>
</pre>
<p>The hash in question will look something like this:</p>
<pre class="code"><span class='lbrace token'>{</span>
<span class='string val'>'uid'</span> <span class='assign token'>=</span><span class='gt op'>&gt;</span> <span class='string val'>'12356'</span><span class='comma token'>,</span>
<span class='string val'>'provider'</span> <span class='assign token'>=</span><span class='gt op'>&gt;</span> <span class='string val'>'twitter'</span><span class='comma token'>,</span>
<span class='string val'>'user_info'</span> <span class='assign token'>=</span><span class='gt op'>&gt;</span> <span class='lbrace token'>{</span>
<span class='string val'>'name'</span> <span class='assign token'>=</span><span class='gt op'>&gt;</span> <span class='string val'>'User Name'</span><span class='comma token'>,</span>
<span class='string val'>'nickname'</span> <span class='assign token'>=</span><span class='gt op'>&gt;</span> <span class='string val'>'username'</span><span class='comma token'>,</span>
<span class='comment val'># ...</span>
<span class='rbrace token'>}</span>
<span class='rbrace token'>}</span>
</pre>
<p>The <code>user_info</code> hash will automatically be populated with as much information about the user as OmniAuth was able to pull from the given API or authentication provider.</p>
<h2 id='resources'>Resources</h2>
<p>The best place to find more information is the <a href='http://github.com/intridea/omniauth/wiki'>OmniAuth Wiki</a>. Some specific information you might be interested in:</p>
<ul>
<li><a href='http://github.com/intridea/omniauth/wiki/Roadmap'>Roadmap</a></li>
<li><a href='http://github.com/intridea/omniauth/wiki/Changelog'>Changelog</a></li>
<li><a href='http://github.com/intridea/omniauth/issues'>Report Issues</a></li>
<li><a href='http://groups.google.com/group/omniauth'>Mailing List</a></li>
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</ul>
<h2 id='license'>License</h2>
<p>OmniAuth is licensed under the MIT License.</p></div></div>
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