Question

I would like to make a button on my website that automatically logs me in on another website. I recon I can use either Javascript/jQuery or PHP/cURL to do this.

Which is the best way to go?

Answer 1

I’m not sure if this is exactly what you’re looking for, but one thing I have done in the past is to mimic the login form on the site you want to log in to.
For example lets say you want to log in to ‘example.com’. In the source code for the login page of ‘example.com’ you will find the html code for the login form.

Example

<form name="blabla" action="action.php" method="post">
    <input type="text" name="username" />
    <input type="password" name="password" />
    <input type="sumbit" value="Login" />
</form>

Create a form on your site similar to the one you find in ‘example.com’. If you want you can even hide the fields, include values to make it a one button login. The trick is making sure that the action has the actual url. For example if the form says ‘action.php’ for ‘example.com’ you would put ‘http://example.com/action.php’

Example

<form name="blabla" action="http://example.com/action.php" method="post">
    <input type="hidden" name="username" value="testuser" />
    <input type="hidden" name="password" value="testpass" />
    <input type="sumbit" value="Login" />
<form>

This will log you in to the site in most cases. If you don’t want to leave your own site you can set a ‘target’ for the form to an iframe or something.