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Need to redirect user and need requesting URL

Posted on 2011-03-15
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Last Modified: 2012-05-11
When a user hits a URL from an email, say. If they are not logged in, I need to send them to the login page. Then, after succesful login, I need to navigate them the page they initially requested.

What variable do I look in to get this URL?  Or must I save the URL as a local variable, then use it at the appropriate time?

Thanks,
newbieweb
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Question by:newbieweb
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6 Comments
 

Author Comment

by:newbieweb
ID: 35142429
There are two distinct websites of ours. So the link will be to the second site. I need to log the return URL so when the first site gets the request, it will show the log in screen. On successful login I want to read the return URL and render that page.
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Author Comment

by:newbieweb
ID: 35142470
My code can handle linking from site #2 to site #1, for login. I need to find to what variable I can attach a return URL.
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LVL 33

Accepted Solution

by:
Todd Gerbert earned 500 total points
ID: 35143229
If you're using the LoginControl on site 1, you can handle it's LoggedIn event.  Check for the presence of ReturnUrl QueryString parameter, and if it starts with "http" then use Response.Redirect() to send the user there.
protected void LoginControl_LoggedIn(object sender, EventArgs e)
{
	string redirectUrl = Request.QueryString["ReturnUrl"];
	if (!String.IsNullOrEmpty(redirectUrl))
	{
		if (redirectUrl.ToLower().StartsWith("http"))
			Response.Redirect(redirectUrl);
	}
}

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Then you can put links in the email along the lines of:
<a href="http://www.site1.com/login.aspx?ReturnUrl=http://www.site2.com/somepage.aspx">click here</a>

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Of course, that ReturnUrl parameter should be UrlEncoded, so it would actually look like:
<a href="http://www.site1.com/login.aspx?http%3A%2F%2Fwww.site2.com%2Fsomepage.aspx">click here</a>

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LVL 33

Assisted Solution

by:Todd Gerbert
Todd Gerbert earned 500 total points
ID: 35143269
Oops, the encoded one is actually:
<a href="http://www.site1.com/login.aspx?ReturnUrl=http%3A%2F%2Fwww.site2.com%2Fsomepage.aspx">click here</a>

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This worked in a simple test for me, but I've only got one site, so I just had it send me to www.google.com.
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LVL 33

Assisted Solution

by:Todd Gerbert
Todd Gerbert earned 500 total points
ID: 35143622
Okay, setup a quick pair of web sites and configured them for cross-app authentication, and using the ReturnUrl QueryString parameter seems to work well.
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Author Closing Comment

by:newbieweb
ID: 35147060
Thanks!
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