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    <p>I managed to get my code to work, the difficulty is to get <strong>the right policy</strong>. I'm using <a href="https://github.com/PRX/s3-swf-upload-plugin/tree/master/flex_src/src/com/elctech" rel="nofollow">elctech's library</a> to generate the s3 upload call.</p> <pre><code>import com.elctech.*; public class Uploader{ private var _options : S3UploadOptions = new S3UploadOptions(); // ... public function uploadPDF(tempFile:File):void{ _options.FileSize = tempFile.size.toString(); _options.FileName = getFileName(tempFile); _options.ContentType = 'application/pdf'; _options.key = certificate['key'] + _options.FileName; _options.policy = certificate['policy']; _options.signature = certificate['signature']; _options.bucket = certificate['bucket']; _options.AWSAccessKeyId = certificate['accessKey']; _options.acl = certificate['acl']; _options.Expires = certificate['expiration']; _options.Secure = 'false'; _options.successactionstatus = certificate['sas']; var request:S3UploadRequest = new S3UploadRequest(_options); configureUploadListeners(request); try { request.upload(tempFile); } catch(e:Error) { trace("An error occurred: " + e); } } private function getFileName(file:FileReference):String { var fileName:String = file.name.replace(/^.*(\\|\/)/gi, '').replace(/[^A-Za-z0-9\.\-]/gi, '_'); return fileName; } } </code></pre> <p>I get the amazon s3 certificate from our main Rails application via our API, here's what the policy generation looks like:</p> <pre><code>def certificate bucket = ENV['S3_BUCKET'] access_key = ENV['S3_KEY'] secret = ENV['S3_SECRET'] key = "temp/" expiration = 10.hours.from_now.utc.strftime('%Y-%m-%dT%H:%M:%S.000Z') max_filesize = 500.megabytes acl = 'public-read' sas = '201' policy = Base64.encode64( "{'expiration': '#{expiration}', 'conditions': [ {'bucket': '#{bucket}'}, ['starts-with', '$key', '#{key}'], {'acl': '#{acl}'}, {'Content-Type': 'application/pdf'}, {'Content-Disposition': 'attachment'}, ['starts-with', '$Filename', ''], ['eq', '$success_action_status', '201'] ]} ").gsub(/\n|\r/, '') signature = Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha1'), secret, policy)).gsub(/\n| |\r/, '') { :access_key =&gt; access_key, :key =&gt; key, :policy =&gt; policy, :signature =&gt; signature, :sas =&gt; sas, :bucket =&gt; bucket, :acl =&gt; acl, :expiration =&gt; expiration } end </code></pre>
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