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    <p>I would go with this:</p> <ol> <li>user initiates action, javascript asks <strong>Server 1</strong> (ajax) for request for file on Server 2</li> <li>Server 1 creates URL using <a href="http://php.net/manual/en/function.hash-hmac.php" rel="nofollow noreferrer">hash_hmac</a> with data: file, user ID, user secret</li> <li>when clicking that URL (server2.com/?file=FILE&amp;user_id=ID&amp;hash=SHA_1_HASH) <strong>server 2</strong> asks server 1 for validation (sends file, user_id and hash)</li> <li>server 1 does the validation, sends response to server 2</li> <li>server 2 pushes file or sends 403 HTTP response</li> </ol> <p>This way, server 2 only needs to consume API of server 1, server 1 has all the logic. </p> <p>Pseudocode for hash and url creation:</p> <pre><code>// getHash($userId, $file) method $user = getUser($userId); $hash = hash_hmac('sha1', $userId . $file, $user-&gt;getSecret()); // getUrl($userId, $file) method return sprintf('http://server2.com/get-file?file=%1&amp;user_id=%2&amp;hash=%3', $userId, $file, $security-&gt;getHash($userId, $file) ); </code></pre> <p>Pseudocode for validation:</p> <pre><code>$hash = $security-&gt;getHash($_GET['id'], $_GET['file']); if ($hash === $_GET['hash']) { // All is good } </code></pre> <p>Edit: <code>getHash()</code> method accepts user ID and file (ID or string, what ever suits your needs). With that data, it produces a hash, using <code>hash_hmac</code> method. For the <code>secret</code> parameter of hash_hmac function, users "secret key" is used. That key would be stored together with users data in the db table. It would be generated with mt_rand or even something stronger as reading /dev/random or using something like <a href="https://stackoverflow.com/a/16478556/691850">https://stackoverflow.com/a/16478556/691850</a>.</p> <p>A word of advice, use <a href="https://tn123.org/mod_xsendfile/" rel="nofollow noreferrer">mod_xsendfile</a> on server 2 (if it is Apache) to push files.</p>
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    1. POGood method to authenticate files to users
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    1. COAlthough I agree with you solution, your example leaves out all the important stuff. I would be able to fill in the blanks, but I think that for this answer to become the accept answer with bounty, you should explain what `$security->getHash()` would do. Because that is what is asked. The 5 step plan is just a better way to explain what Naveen tried to do in his paragraph about `When API on server 2 received...`
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      1. USHugo Delsing
    2. CO+1 for HMAC. You just need a single key for both servers. HMAC using that key and include the user_id, file_id, and timestamp. That way you can disable the URL after a certain time, and server 1 doesn't need to ask server 2 for validation.
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      1. USSteve Clay
    3. COAlso you want http_build_query() for the URL building.
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      1. USSteve Clay
 

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