Slide 1Google DataFeedGoogle Data APIAuthenticationSlide 6Slide 7ClientLogin AuthenticationSlide 9Slide 10AuthSub AuthenticationSlide 12Slide 13Slide 14Protocol BasicsProtocol Basics…Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Common Elements: "Kinds"Slide 25Slide 26Slide 27Batch ProcessingOverviewGoogle Base Data APISlide 31Overview…Feeds UsedFeeds Used…Slide 35Google Base data APISlide 37Slide 38QueryingQuerying…YouTube Data APIVideo Feeds and EntriesUploading VideosDirect UploadingBrowser-based UploadingSearching For VideosStandard FeedsSlide 48Slide 49Slide 50SearchingUpdating a Video EntryDeleting a Video EntrySharing VideosSubscriptionsReferences1Presented By:Nageswari Vallabhaneni Sukumar Manduva2Google DataGData provides a simple standard Protocol for reading and writing data on web.Atom or RSSAtom Publishing ProtocolHTTP GET requestHTTP PUT request.Results as an Atom or RSS feed3FeedProvides frequently updated content.Syndication of a web feed allows users to subscribe to it. A web feed is also called syndicated feed.4Google Data APIAuthentication Protocol BasicsCommon Elements: "Kinds"Batch ProcessingGoogle Base APIYou Tube API5AuthenticationClient app will act on behalf of a particular user of a Google service. Access to account specific informationRequest Contains Headers for (X-GData-Key, Authorization). X-GData-Key  Developer Key Authorization  ClientLogin (or) AuthSub6AuthenticationClient app will act on behalf of a particular user of a Google service.GData uses two different authentication systems …1. "ClientLogin" system 2. "AuthSub" system7ClientLogin Method is used for stand alone applications.Users username, password and the application are encoded in the Authentication request.After a successful authentication request, use the Auth value to create an Authorization header for each GData request: Authorization:GoogleLoginauth=yourAuthValueClientLogin Authentication8ClientLogin Authentication9ClientLogin AuthenticationIf a ClientLogin-authenticated GData request fails, you may receive any of a variety of HTTP error status codes in response 403 Account disabled403 Account deleted401 Token disabled401 Token expired10When an API Request is made the Developer Key Header Specifies on behalf of Which registered developer the request is coming. AuthSub Authentication11AuthSub Authentication "AuthSub" system Used if your client is a multi-user web application client To acquire an AuthSub token your web app must redirect the user to the AuthSubRequest URL at Google which has “NEXT” query parameter.Gets an authentication token without ever handling the user's account login information12AuthSub AuthenticationAfter you've acquired an authentication token, you use that token to create an Authorization header for each request: Authorization: AuthSub token="yourAuthToken"13AuthSub AuthenticationIf an AuthSub-authenticated GData request fails, you may receive any of a variety of HTTP error status codes in response 401 Token invalid401 Token disabled401 Token expired401 Token revoked14AuthSub Authentication Header for 401 Token Revoked Error401 Token revoked WWW-Authenticate: AuthSub realm="http://www.google.com/accounts/AuthSubRequest" Content-Type: text/html; charset=UTF-8 Expires: Wed, 26 Mar 2008 17:11:31 GMT Cache-Control: private, max-age=0 Content-Length: 149 Date: Wed, 26 Mar 2008 17:11:31 GMT Server: GFE/1.315Protocol Basics Requesting a feed or other resource:Assume there's a feed called /Newsfeed, with no entries in it....To see it, send the following request to the server:GET /Newsfeed16Protocol Basics…The server responds:200 OK<?xml version="1.0"?><feed xmlns="http://www.w3.org/2005/Atom"> <title>e-News</title> <updated>2008-03-26T16:25:00-08:00</updated> <id>http://www.cnn.com/Newsfeed</id> <author> <name>Jo March</name> </author> <link href="/Newsfeed" rel="self"/></feed>17Protocol Basics… Inserting a new entry: POST /Newsfeed<?xml version="1.0"?><entry xmlns="http://www.w3.org/2005/Atom"> <author> <name>Paul Harvey</name> <email>[email protected]</email> </author> <title type="text">HeadLines</title> <content type="text">VT Beat UVa</content></entry>18Protocol Basics…The server responds:201 CREATED<?xml version="1.0"?><entry xmlns="http://www.w3.org/2005/Atom"> <id>1</id> <link rel="edit" href="http://cnn.com/Newsfeed/1/1/"/> <updated>2008-03-26T16:26:03-08:00</updated> <author> <name>Paul Harvey</name> <email>[email protected]</email> </author> <title type="text">HeadLines</title> <content type="text">VT Beat UVa</content></entry>19Protocol Basics…Updating an entry :To update an existing entry, use PUT, with the entry's edit URI Changing entry's text from (" VT Beat UVa ") to (“VT embarrassed UVa."):PUT /myFeed/1/1/<?xml version="1.0"?><entry xmlns="http://www.w3.org/2005/Atom"> <id>1</id> <link rel="edit" href="http://cnn.com/Newsfeed/1/1/"/> <updated>2008-03-26T16:28:05-08:00</updated> <author> <name>Paul Harvey</name> <email>[email protected]</email> </author> <title type="text"> Head Lines </title> <content type="text"> VT embarrassed UVa.</content></entry>20Protocol Basics…The server responds:200 OK<?xml version="1.0"?><entry xmlns="http://www.w3.org/2005/Atom"> <id>1</id> <link rel="edit" href="http://cnn.com/Newsfeed/1/2/"/> <updated>2008-03-26T16:28:05-08:00</updated> <author> <name>Paul Harvey</name> <email>[email protected]</email> </author> <title type="text"> Head Lines </title> <content type="text"> VT embarrassed UVa.</content></entry>Edit URI has changed..It now ends with "/2/" instead of "/1/". The final number in the edit URI is a version number.21Protocol Basics…Searching for a string:To do a full-text search for a particular string , send a GET request with the q parameter.GET /Newsfeed?q=VT22Protocol Basics…The server responds with all the entries that match the search string “VT”200 OK<?xml version="1.0"?><feed xmlns="http://www.w3.org/2005/Atom"> <title>e-News</title> <updated>2008-03-26T16:26:03-08:00</updated> <id>http://www.cnn.com/Newsfeed</id> <author> <name>Jo March</name> </author> <link href="/Newsfeed" rel="self"/> <entry> <id>1</id> <link rel="edit" href="http:// www.cnn.com/Newsfeed