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POGoogle Storage REST PUT With Signed URLs
 

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  1. POGoogle Storage REST PUT With Signed URLs
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    <p>I'm trying to upload the base64 data of an image directly through javascript to Google Storage using signed URLs as authentication, which is apparently possible to do.</p> <p>According to developers.google.com/storage/docs/reference-methods#putobject there are only six headers that need to be set for this to work. Also for the header 'Authorization' I'm attempting to use the last option here:</p> <p>developers.google.com/storage/docs/reference-headers#authorization </p> <p>Which is 'A signature' developers.google.com/storage/docs/authentication#service_accounts</p> <p>The only thing I want to use PHP for is to get the signature. Here is what I have been trying to get working with no success.</p> <p>PHP &amp; JS page/code</p> <pre><code>&lt;?php $theDate = Date(DATE_RFC822); function signedURL( $filename, $bucket, $method = 'PUT' ) { $signature = ""; $duration = 30; $emailID = "980000000000-ytyertyr@developer.gserviceaccount.com"; $certs = array(); $priv_key = file_get_contents("9999999999999999999999999999-privatekey.p12"); if (!openssl_pkcs12_read($priv_key, $certs, 'notasecret')) { echo "Unable to parse the p12 file. OpenSSL error: " . openssl_error_string(); exit(); } $expires = time() + $duration; $to_sign = ( $method . "\n\n\n" . $expires . "\n" . "/" . $bucket . "/" . $filename ); $RSAPrivateKey = openssl_pkey_get_private($certs["pkey"]); if (!openssl_sign( $to_sign, $signature, $RSAPrivateKey, 'sha256' )) { error_log( 'openssl_sign failed!' ); $signature = 'failed'; } else { $signature = urlencode( base64_encode( $signature ) ); } return ( 'http://storage.googleapis.com/' . $bucket . '/' . $filename . '?GoogleAccessId=' . $emailID . '&amp;Expires=' . $expires . '&amp;Signature=' . $signature ); openssl_free_key($RSAPrivateKey); } ?&gt; &lt;script&gt; var base64img = 'data:image/png;base64,AAABAAIAICA....snip...A'; var xhr = new XMLHttpRequest(); //PUT test - PUT status "(Canceled)" - OPTION status 200 (OK) xhr.open("PUT", "&lt;?php echo signedURL('test.png', 'mybucket'); ?&gt;"); //xhr.setRequestHeader("Content-type", "image/png"); xhr.setRequestHeader("x-goog-acl", "public-read"); //try to set public read on file xhr.setRequestHeader("Content-Length", base64img.length); // Chrome throws error (Refused to set unsafe header "Content-Length" ) xhr.send( base64img ); //GET test.txt temp file - working and returning 200 status (signing must be working ?) /* xhr.open("GET", "&lt;?php echo signedURL('test.txt', 'mybucket', 'GET'); ?&gt;"); xhr.send(); */ // &lt;/script&gt; </code></pre> <p>Cors xml (seems to be fine) - I've set a wildcard only while testing and a low cache/maxage time</p> <pre><code>&lt;?xml version="1.0" ?&gt; &lt;CorsConfig&gt; &lt;Cors&gt; &lt;Origins&gt; &lt;Origin&gt;*&lt;/Origin&gt; &lt;/Origins&gt; &lt;Methods&gt; &lt;Method&gt;GET&lt;/Method&gt; &lt;Method&gt;HEAD&lt;/Method&gt; &lt;Method&gt;OPTIONS&lt;/Method&gt; &lt;Method&gt;PUT&lt;/Method&gt; &lt;/Methods&gt; &lt;ResponseHeaders&gt; &lt;ResponseHeader&gt;accept-encoding&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;cache-control&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;content-length&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;content-type&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;expect&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;if-modified-since&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;origin&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;range&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;referer&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;x-goog-acl&lt;/ResponseHeader&gt; &lt;ResponseHeader&gt;x-goog-api-version&lt;/ResponseHeader&gt; &lt;/ResponseHeaders&gt; &lt;MaxAgeSec&gt;900&lt;/MaxAgeSec&gt; &lt;/Cors&gt; &lt;/CorsConfig&gt; </code></pre> <p>I've tested the GET method on a file and get a 200 status back now (\n\n - fix)</p> <p><strong>Update:</strong></p> <p>Looking in Firefox it does return a 403, unlike Chrome.</p> <p><img src="https://i.stack.imgur.com/rQCU4.png"></p>
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