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    <p>Here's the exact code I used to get this to work...</p> <pre><code>var params = {}; $('#uploader').pluploadQueue({ runtimes: 'html5,flash', flash_swf_url: '/js/plupload/1.5.4/plupload.flash.swf', // Have to load locally url: 'https://s3.amazonaws.com/my-bucket-name', multiple_queues: true, preinit: { UploadFile: function (up, file) { up.settings.multipart_params = { key: file.name, filename: file.name, AWSAccessKeyId: 'my-aws-access-key', acl: 'private', policy: params[file.name]["policy"], signature: params[file.name]["signature"], success_action_status: '201' } } }, init: { FilesAdded: function (up, files) { plupload.each(files, function (file) { $.ajax({ url: '/r/prepare_raw_upload', type: 'post', data: { acl: 'private', bucket: 'my-bucket-name', file: file.name }, success: function (data) { if (data.success) { params[data.file] = { policy: data.policy, signature: data.signature }; } else if (data.message) { alert(data.message); } } }); }); } } }); </code></pre> <p>You'll notice in the FilesAdded event listener I have an ajax call. This retrieves the policy and the signature from my server for each file added.</p> <p>Here's the code on the back that sends back the policy and signature</p> <pre><code>public static Dictionary&lt;string, object&gt; prepareUpload(DateTime now, string acl, string bucket, string key, string file) { Dictionary&lt;string, object&gt; result = new Dictionary&lt;string, object&gt;(); ASCIIEncoding encoding = new ASCIIEncoding(); string policy = createUploadPolicy(now, acl, bucket, key); result.Add("policy", Convert.ToBase64String(encoding.GetBytes(policy))); result.Add("signature", createUploadSignature(policy)); result.Add("file", file); return result; } public static string createUploadPolicy(DateTime now, string acl, string bucket, string key) { ASCIIEncoding encoding = new ASCIIEncoding(); JavaScriptSerializer jss = new JavaScriptSerializer(); Hashtable policy = new Hashtable(); policy.Add("expiration", now.AddDays(1).ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss.fff'Z'")); ArrayList conditions = new ArrayList(); conditions.Add(new Hashtable { { "acl", acl } }); conditions.Add(new Hashtable { { "bucket", bucket } }); conditions.Add(new Hashtable { { "key", key } }); conditions.Add(new ArrayList { "starts-with", "$name", "" }); conditions.Add(new ArrayList { "starts-with", "$filename", "" }); conditions.Add(new ArrayList { "starts-with", "$success_action_status", "" }); policy.Add("conditions", conditions); return jss.Serialize(policy); } public static string createUploadSignature(string policy) { ASCIIEncoding encoding = new ASCIIEncoding(); byte[] policyBytes = encoding.GetBytes(policy); string policyBase64 = Convert.ToBase64String(policyBytes); byte[] secretKeyBytes = encoding.GetBytes(ConfigurationManager.AppSettings["AWSSecretKey"]); HMACSHA1 hmacsha1 = new HMACSHA1(secretKeyBytes); byte[] policyBase64Bytes = encoding.GetBytes(policyBase64); byte[] signatureBytes = hmacsha1.ComputeHash(policyBase64Bytes); return Convert.ToBase64String(signatureBytes); } </code></pre> <p>Very helpful links in making this work were...</p> <p><a href="https://stackoverflow.com/questions/4639471/how-do-i-make-plupload-upload-directly-to-amazon-s3">How do I make Plupload upload directly to Amazon S3?</a></p> <p><a href="http://codeonaboat.wordpress.com/2011/04/22/uploading-a-file-to-amazon-s3-using-an-asp-net-mvc-application-directly-from-the-users-browser/" rel="nofollow noreferrer">http://codeonaboat.wordpress.com/2011/04/22/uploading-a-file-to-amazon-s3-using-an-asp-net-mvc-application-directly-from-the-users-browser/</a></p>
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    1. POHow to implement plupload directly to s3 with 'html5' runtime?
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    1. COThe CORS configuration you are using looks fine too. Mine looks exactly like that.
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    2. COGot it. Thanks for the help guys.
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    3. CO@sunnymtn can you show me the complete code? I don't see how you would implement the code you've provided to the code njebert has shown.
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