Automatically sign in

Hi
I have a requirement that when in a user email, there would be a hyperlink which would automatically login in to a web portal. The user will not be promted for a password. So whats the design alike.

Ah .. this is quite a simple..There is only one way to solve this problem: Use cookies. When the user comes to the site for the veryyyyyyyyy first time. Take in his username and password and store it on 2 separate cookies.
Cookie userCookie1=new Cookie ("UserName", uid);
Cookie userCookie2=new Cookie ("UserName", pwd);
userCookie1.setPath("/");
userCookie2.setPath("/");
res.addCookie(userCookie1);
res.addCookie(userCookie2);Then when the user goes to the site the next time.. simply extract that particular cookie, get the details, authorize the user and let him in. No need of signing in..
But the disadvantages of this approach is:
1. Its PC specific. Cookies r set in 1 PC only. when the user tries to login from another PC... he has to sign in all over again.
2. Serious security issues. Whoever uses the PC where the cookie is stored is automatically signed in.
3. If the user manually deletes all the cookies from the 'history' of the browser.. he has to sign in again!
Hope this info helps u!
Good Luck!

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