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    <p>After gathering the individual pieces of this puzzle, I was able to create this Ruby method that properly signs a query string url using the aws secret key.</p> <p>My resources for this:</p> <ul> <li><a href="http://docs.amazonwebservices.com/AmazonS3/latest/API/index.html?RESTObjectGET.html" rel="nofollow">RESTObjectGET documentation</a></li> <li><a href="http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?RESTAuthentication.html#RESTAuthenticationQueryStringAuth" rel="nofollow">Signing and Authenticating REST Requests</a></li> </ul> <p>Also, the response back from S3 was helpful, because when I created a url with a bad signature, the response showed the string_to_sign that AWS S3 generated from deciphering the URL I generated. After a few iterations I was able to converge on the correct formatting of the string_to_sign and after that it was pretty standard stuff.</p> <p>Here is the Ruby method:</p> <pre><code>############################################################################## # Create a signed query-string URL that supports setting response headers ############################################################################## def s3_signed_url(bucket, pathname, verb, content_md5=nil, content_type=nil, response_headers = {}) expires = Time.now + 5.minutes response_headers_canonicalized = response_headers.sort_by{|key, value| key.downcase}.collect{|key, value| "#{key}=#{value}"}.join("&amp;").to_s string_to_sign = "#{verb.upcase}\n#{content_md5}\n#{content_type}\n#{expires.to_i}\n/#{bucket}/#{pathname}?#{response_headers_canonicalized}" digest = OpenSSL::Digest::Digest.new('sha1') hmac = OpenSSL::HMAC.digest(digest, aws_secret_key, string_to_sign) signature = Base64.encode64(hmac).chomp url = "http://s3.amazonaws.com/#{bucket}/#{pathname}?" if response_headers.count &gt; 0 response_headers.each do |key, value| url += "#{key}=#{value}&amp;" end end url += "AWSAccessKeyId=#{aws_access_key}&amp;Expires=#{expires.to_i}&amp;Signature=#{CGI.escape(signature)}"; return url end </code></pre> <p>And you call the method like this:</p> <pre><code>file_url_s3 = s3_signed_url(file_bucket, file_path, 'GET', nil, nil, {'response-content-disposition' =&gt; 'attachment'}) </code></pre>
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    1. POHow to add Content-Disposition to a pre-authenticated Amazon S3 link
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    1. COThanks! The solution was indeed to add the response headers to the filename (and also use this to calculate the signature)
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