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POHow does LinkedIn know or keep track of where I embedded its widget?
 

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  1. POHow does LinkedIn know or keep track of where I embedded its widget?
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    <p>When you try to integrate with LinkedIn's <code>Apply Now</code> button, you first sign up for an API key. The form asks you to enter the Javascript Domain API, which is the <code>Fully-qualified domain name of all pages that will call the JavaScript API with this key.</code> In return, it produces an API key and some HTML code for you which you can copy n paste to your web page and get started.</p> <p>This is the code their wizard produced:</p> <pre><code>&lt;script src="http://platform.linkedin.com/in.js" type="text/javascript"&gt; api_key: 7a4ghb12agvda4552da &lt;/script&gt; &lt;script type="IN/Apply" data-companyname="Asd" data-jobtitle="Software Developer" data-joblocation="Istanbul" data-email="abc@xyz.com"&gt; &lt;/script&gt; </code></pre> <p>Now, how does one keep track of where this script is embedded? I first entered <code>http://example.com</code> as the my Javascript Domain API. It turned out that I can only use this widget on the example.com domain.</p> <p>What's inside <code>in.js</code> that tells LinkedIn where it is embedded?</p> <p>The reason I'm asking is because I am also building a widget myself, and I want to make sure only the signed-up domains can use my widget.</p> <p><strong>Edit:</strong> As a bonus, what if I download <code>in.js</code>, remove the part where it does the domain check and include my own version of in.js in my page? How do they prevent that?</p> <p><a href="https://developer.linkedin.com/forum/security-prevent-impersonations" rel="nofollow">A LinkedIn employee mentions that both client-side and server-side checks are done.</a> But what kind of a check would that be? I am looking for some deep insight into the issue. How can I produce such a widget? On the client-side, how do you check the current page that hosts your .js file? And how do you get which domain is hosting the js file? Any help appreciated. Thanks.</p>
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