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PORetrieving file from Dropbox using PHP returns 403 Invalid Signature
 

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  1. PORetrieving file from Dropbox using PHP returns 403 Invalid Signature
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    <p>I'm trying to download all files from a specific directory in my Dropbox to a directory on my web server, if a file of the same name doesn't already.</p> <p>I'm using this <a href="http://www.sitepoint.com/access-dropbox-using-php/" rel="nofollow noreferrer">SitePoint Tutorial</a> as the guide.</p> <p>The problem I'm having is that the Dropbox API returns an <code>Invalid Signature</code> error when it gets to certain files. I can't see anything odd or special about these files. Some are PDFs, some are PNGs.</p> <p>I've read this <a href="https://stackoverflow.com/a/17070042/426935">could relate to OAuth</a>, but I can't figure it out.</p> <p>I believe errors at the <code>getFile()</code> within the <code>foreach()</code>, depending on the file:</p> <pre><code>&lt;?php require_once "bootstrap.php"; if (!isset($access_token)) { header("Location: authorize.php"); exit; } try { $session = new DropboxSession($config["dropbox"]["app_key"], $config["dropbox"]["app_secret"], $config["dropbox"]["access_type"], $access_token); $client = new DropboxClient($session); $path = "/Stuff/folder_to_download"; $home = $client-&gt;metadata($path); foreach($home['contents'] as $item) { echo "&lt;pre&gt;" . print_r($item, true) . "&lt;/pre&gt;"; $path = $item['path']; if ( $item['is_dir'] == '1' ) continue; // where to save it $dest = $config["app"]["datadir"] . "/" . basename($path); if ( file_exists($dest) ) { echo "&lt;p&gt;File &lt;code&gt;". $dest . "&lt;/code&gt; already exists. Skipped.&lt;/p&gt;"; continue; } // Download file if ($file = $client-&gt;getFile($path, $dest)) { if (!empty($dest)) { unset($file["data"]); echo "&lt;p&gt;File saved to: &lt;code&gt;" . $dest . "&lt;/code&gt;&lt;/p&gt;"; } } } } catch (Exception $e) { echo "&lt;strong&gt;ERROR (" . $e-&gt;getCode() . ")&lt;/strong&gt;: " . $e-&gt;getMessage(); } ?&gt; </code></pre> <p>The <code>authorize.php</code> file <a href="https://github.com/phpmasterdotcom/AccessDropboxUsingPHP/blob/master/authorize.php" rel="nofollow noreferrer">looks like this</a>. <code>bootstrap.php</code> <a href="https://github.com/phpmasterdotcom/AccessDropboxUsingPHP/blob/master/bootstrap.php" rel="nofollow noreferrer">looks like this</a>.</p> <p><strong>Update 1:</strong> I've still not been able to resolve this error. Is there a different set of Dropbox/ PHP code I could use instead of this sitepoint one?</p> <p>Here's the raw error when I remove the try/catch:</p> <pre><code>Fatal error: Uncaught exception 'Exception' with message 'Invalid signature.' in /myapp/lib/dropbox/rest.php:162 Stack trace: #0 /myapp/lib/dropbox/rest.php(85): DropboxRESTClient-&gt;request('https://api-con...', 'GET', NULL, NULL, NULL, true) #1 /myapp/lib/dropbox/session.php(278): DropboxRESTClient-&gt;get('https://api-con...', NULL, true) #2 /myapp/lib/dropbox/client.php(106): DropboxSession-&gt;fetch('GET', 'https://api-con...', '/files/dropbox/...', Array, true) #3 /myapp/download.php(54): DropboxClient-&gt;getFile('/Stuff/Droppod/...', '/myapp/...') #4 {main} thrown in /myapp/lib/dropbox/rest.php on line 162 </code></pre> <p>The <a href="https://github.com/phpmasterdotcom/AccessDropboxUsingPHP/blob/master/lib/dropbox/rest.php" rel="nofollow noreferrer">lib/dropbox/rest.php file is on GitHub</a> for reference.</p>
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