Adding Google Calendar entry without using setUserCredentials - asp.net

Question

I am following the example provided by Google for Market place app at
http://code.google.com/googleapps/marketplace/tutorial_dotnet.html
I got the google authentication working as in the example ,
My next task is to add a entry to Google calendar. I found following code for that, and it is also working fine
CalendarService service = new CalendarService(APPLICATION_NAME);
service.setUserCredentials(vUserName, vPassword);
Google.GData.Calendar.EventEntry entry = new Google.GData.Calendar.EventEntry();
// Set the title and content of the entry.
entry.Title.Text = title;
entry.Content.Content = contents;
// Set a location for the event.
Where eventLocation = new Where();
eventLocation.ValueString = location;
entry.Locations.Add(eventLocation);
When eventTime = new When(startTime, endTime);
entry.Times.Add(eventTime);
Uri postUri = new Uri("http://www.google.com/calendar/feeds/default/private/full");
// Send the request and receive the response:
AtomEntry insertedEntry = service.Insert(postUri, entry);
The problem i have is the following line, If i give my username and password it will work
service.setUserCredentials(vUserName, vPassword);
i have authenticated the user as in google example. So I don’t know the username and password of other users login to my site using their gmail.
How do i add a calender entry with the information i have?
I have seen several examples with RequestFactory authenticating the user. but couldn't find complete example that I can use

Answer 1

you will need to create a .pfx cert file and upload it to google and place it on your server.
create your AuthSubRequest URL
<asp:HyperLink ID="GotoAuthSubLink" runat="server"/>
GotoAuthSubLink.Text = "Login to your Google Account";
GotoAuthSubLink.NavigateUrl = AuthSubUtil.getRequestUrl("(return url)http://www.example.com/RetrieveToken", "https://www.google.com/calendar/feeds/", false, true);
after the person clicks on your auth link they are returned to your return url. get your session token as follows
String sessionToken = ""; //Save this for making your calls.
String certFile = "D:\\websites\\yourwebsite.com\\google.pfx";
String result = GetAuthSubSessionToken(Request["token"]);
protected AsymmetricAlgorithm GetRsaKey()
{
X509Certificate2 cert = new X509Certificate2(certFile, "");
RSACryptoServiceProvider privateKey = cert.PrivateKey as RSACryptoServiceProvider;
return privateKey;
}
public string GetAuthSubSessionToken(string singleUseToken)
{
string gatStr = "";
try
{
AsymmetricAlgorithm rsaKey = GetRsaKey();
try
{
sessionToken = AuthSubUtil.exchangeForSessionToken(singleUseToken, rsaKey).ToString();
gatStr = "Session Token = " + SessionToken;
}
catch (Exception e)
{
gatStr = "Error: I appears that the Google authentication server is experiencing an error. Try the authorizaton link again in a few minutes. <a href=\""
+ rtnUrl + "\" title=\"" + e.Message + "\">continue</a>";
}
}
catch (Exception E)
{
gatStr = "Error: rsa " + E.Message + E.StackTrace;
}
return gatStr;
}
save the session token and use CreateCalendarService in subsequent calls to create your calendar service.
public CalendarService CreateCalendarService()
{
GAuthSubRequestFactory authFactory = new GAuthSubRequestFactory("cl", "YourName-calendarApp-1");
authFactory.Token = sessionToken;
authFactory.PrivateKey = GetRsaKey();
CalendarService cs = new CalendarService(authFactory.ApplicationName);
cs.RequestFactory = authFactory;
return cs;
}