Week5 Examples: Web Clients

1. Tweeter Client: Key point, API for OAuth.
   • Credit: this example is based on the two blog postings by Sudhindra Kovalam:
     • Part1: http://sudheerkovalam.wordpress.com/2010/08/28/a-windows-phone-7-twitter-application-part-1/
     • Part2: http://sudheerkovalam.wordpress.com/2010/09/05/a-windows-phone-twitter-application-part-2-of-2/
     • Source code download (at the end of the send posting):  https://skydrive.live.com/?cid=5e51a69c0b38399a&sc=documents&id=5E51A69C0B38399A!317
   • Twitter API:
     • https://dev.twitter.com/
     • Registration: Click on "Create an app"
     • Make sure you allow: 3rd party reading your Twit and
     • Make sure you allow: App allows R/W access level to user account
   • Learning OAuth from Tweeter API
     • The need for OAuth: (Authorizing a request) https://dev.twitter.com/docs/auth/authorizing-request
     • Sign-in: https://dev.twitter.com/docs/auth/implementing-sign-twitter
     • Tweeter's way of creating a signature: https://dev.twitter.com/docs/auth/creating-signature
   • This example uses Hammock.Windows.Phone API for OAuth support. Compare to our previous FB application, where we sits on customized FB API. This difference means:
     • With customized API: FB URI functions are embedded and hidden from our c# code. We make C# functions calls to access FB URI-API's
     • In this case, Hammock helped us with OAuth, and generic REST calls (refer to Posting Twitter)
   • Twitter for any users are generic accessible by all!
     • Try: http://api.twitter.com/1/statuses/user_timeline.xml?screen_name= (provide your own user name)
     • Returns result in XML
     • Notice: how XML is parsed into Binding data source in the WebClient service routine in (GetUserTimeLine() function).
       

2. Challenge: Up-to 0.2 GPA points!! Extra credit
   • Example of OAuth-ed connection to a web-service from WP7: e.g,
     • Google (watch out this make be tricky!): get a list of gmail items from inbox
     • yahoo (no idea how difficult/simple)
     • yelp netflix,
     • whatever, ask me
   • 0.1 GPA per each example. Your example MUST
     • contain not more than 1 xaml page
     • contain no more than 2 .cs source code
     • support authorization of any registered user for the web-service (e.g. gmail user to login to gmail)
     • allow user to post of some information to their account (e.g., new gmail item), and listing of items that show the update (reading back the previous 10 emails)
   • Talk to me before you begin. First-come-first serve. Some of the services can be trivial
     • Windows Live service: 0.1 GPA for 3 separate examples:
       • Hotmail example, + Skydrive Example + Calandar