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POQuestions About Consuming Your Own API with OAuth
 

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    <p>I'm building a RESTful API for a project I'm working on and I'd like to make the main application consume the API because:</p> <ol> <li>It will result in having one set of code to maintain</li> <li>Should we decide to expose the API for 3rd party devs it will already be done</li> <li>It opens up the possibility to make mobile applications that consume it</li> <li>I really want to learn how to do it</li> </ol> <p>The API will be hosted on a subdomain <code>https://api.example.com</code> and the main web application will be hosted at the root domain <code>https://example.com</code>. </p> <p>Conceptually I understand how everything works, but my main question is how the authentication flow will change if, at all. Ordinarily 3rd party apps would: </p> <ol> <li>Obtain a request token from <code>https://api.example.com/request_token</code></li> <li>Redirect the user to authenticate on <code>https://api.authenticate.com/authorize</code></li> <li>Get redirected back to the 3rd party application</li> <li>Obtain an access token from <code>https://api.example.com/access_token</code></li> </ol> <p>Since I control both domains, can I do something similar to:</p> <ol> <li>Obtain a request token when the user lands on the login screen at <code>https://www.example.com</code></li> <li>The user authenticates using a form on <code>https://www.example.com</code> that calls the same code as <code>https://api.example.com/authorize</code></li> <li>If the credentials are valid, the request token is swapped for the access token</li> <li>Access token is saved in the session and expires when the user logs out like it normally would</li> </ol> <p>Step 3 feels like it's wrong since there will be duplicate code, but wouldn't it open me up to XSS attacks is the login form on <code>https://www.example.com</code> sent the data to <code>https://api.example.com</code> since they are <em>technically</em> different domains?</p> <p>Am I overcomplicating this?</p>
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