Twitter OAuth With C#/.NET Code
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  • 1. Twitter OauthAnd .Net Code
    Mohamed Meligy
    http://gurustop.net
    http://twitter.com/meligy
  • 2. Application Registration
    A Twitter user creates a Twitter Application
    If the application is web based, it needs to provide a URL. “Localhost” is not accepted as a domain for this URL
    A Twitter Application gets two pieces of information
    Consumer Key
    Consumer Secret
    A Twitter Application will use these in all coming requests.
  • 3. Initializing The Process
    User comes to the application and it decides to authenticate against Twitter
    Application makes a request using Consumer Key and Secret to obtain “Oauth Request Token”, which consists of two parts
    Token
    Token Secret
    Application makes authentication URL including the “Oauth Request Token” parameter, and optionally a “Call-back URL” (if different than default URL in first step)
  • 4. User Authentication
    The user is redirected to Twitter, the URL contains the “Oauth Request” to identify application authentication session
    Assuming the Twitter User being logged in and authorizes the Application
    If the application is a desktop application, Twitter gives the a user a number “Verifier” to manually write back to the application
    If the application is a web application, the user is redirected back to the application call-back URL with a complex “Verifier” parameter in the URL
  • 5. Obtaining the Access Token
    The Application makes a request to Twitter including the “Oauth Request Token” and the “Verifier”
    It obtains an “Access Token”, likewise it consists of two-parts:
    Token
    Token Secret
    The application needs to send the Consumer Key and Secret and Access Token in every future request that needs the Twitter User privileges
  • 6. Caching Credentials
    The application needs at least one authorization process as before
    The Access Token returned can be saved in session/DB/whatever and then re-used later
    The application can later use the Access Token directly along with the Consumer Key / Secret to communicate with Twitter without going through any of the previous steps
  • 7. Sample Code
    TweetSharp v 2.0
  • 8. Request Token & Redirect
  • 9. Getting Access Token
  • 10. Hints for Web Applications
    The method GetAuthenticationUrl() has an overload that accepts a call-back URL for the user to be redirected to after obtaining verifer
    The important part in RequestToken is the Token part, not the secret.
    All parts of AccessToken are important and required
    When the user is redirected back from Twitter to your application, you get the following QueryString parameters sent to you
    oauth_token: The Token part of the Request Token
    oauth_verifier: The verifier required to obtain the Access Token later
  • 11. Using Cached Access Token
  • 12. Related Links
    More Content Like This
    http://gurustop.net
    Twitter Developers Site
    http://developer.twitter.com
    TweetSharp
    http://tweetsharp.codeplex.com
    Questions / Suggestions?
    http://twitter.com/meligy
    http://gurustop.net/contact
    eng.meligy@gmail.com