Google Account Logon Service

Some websites now have the Google account logon function. For example, such logon methods are actually beneficial to users. As long as I have a Google account, I can log on to a website that uses Google to log on to the service. For more information about this function, see

Flowchart of this function:

 

Description:

Take www.sopif.com as an Example

Http://www.sopif.com/logintest.aspxthis page, there is a button, click the corresponding eventCode

Code
StringS= "Https://www.google.com/accounts/AuthSubRequest? Next = http % 3A % 2f % 2fwww.sopif.com % 2flhking. aspx & scope = http % 3A % 2f % 2fwww.google.com % 2 fcalendar % 2 ffeeds % 2f & session = 1 & secure = 1";
Response. Redirect (s );

The next parameter indicates the redirected page after a successful Google login. scope is the Google service you want to access.

 

On the my next parameter page, lhking. aspx

Page code:

Code
  Object Token;
Protected   Void Page_load ( Object Sender, eventargs E)
{
Token = Request. querystring [ " Token " ];
If (Token ! =   Null )
{
Response. Write ( " You have successfully logged on with your Google account! " + " <Br/> " );
Response. Write (token. tostring ());
}
Else
{
Response. Write ( " You failed to log on with your Google account! " );
}
}

 

That's all. You can test that in this case, Google returns only one token, and the user name and password are safe.

To obtain the email address and name returned by Google:

Please refer to the class. When used, directly response. Redirect (New googlelogin (). getloginurl (); // log on to your Google account

Code
  ///   <Summary>
/// Provide logon to a Google account
///   </Summary>
Public   Class Googlelogin: iloginservice
{
String Urlauthsubrequest =   " Https://www.google.com/accounts/AuthSubRequest? " ;
String Next = Iloginservice. websiteurl () +   " /Auth/handle. aspx " ;
String Scope =   " Http://www.google.com/m8/feeds/contacts/default/thin? Max-Results = 0 " ;
String Urldata =   "" ;

///   <Summary>
/// Generate logon URL
///   </Summary>
///   <Returns> </returns>
Public   Override   String Getloginurl ()
{
Return Urlauthsubrequest +   " Next = "   + Httputility. urlencode (next) +   " & Scope = "   + Httputility. urlencode (scope );
}

///   <Summary>
/// Get the email address and name of the Google account
///   </Summary>
///   <Param name = "page"> </param>
///   <Returns> </returns>
Public   Override   String [] Parsehandle (httpcontext page)
{
Urldata = Scope;
String [] RET =   New   String [ 2 ];
Try
{
String Token = Page. request [ " Token " ];
Httpwebrequest request = (Httpwebrequest) webrequest. Create ( New Uri (urldata ));
Request. headers. Add ( " Authorization " , " Authsub token = "   + Token );
Request. Method =   " Get " ;
Httpwebresponse response = (Httpwebresponse) request. getresponse ();

Xmldocument Doc =   New Xmldocument ();
If (Response ! =   Null )
{
String Account =   String . Empty, name =   String . Empty;

Doc. Load (response. getresponsestream ());
Xmlnode Node = Doc. selectsinglenode ( " */* [Local-Name () = 'id'] " );
If (Node ! =   Null )
{
Account = Node. innertext; // Email Address
}
Node = Doc. selectsinglenode ( " */* [Local-Name () = 'author']/* [local-Name () = 'name'] " );
If (Node ! =   Null )
{
Name = Node. innertext; // Name
}
RET [ 0 ] = Account;
RET [ 1 ] = Name;
Return RET;
}
Else   Return RET;
}
Catch (Exception ex)
{
New Myexception ( " Googlelogin " , Ex. tostring ());
Return   New   String [] { "" , "" };
}
}
}