gistfile1.rb

#application_helper.rb


	def s3_upload_policy_document(filename)
	    ret = {"expiration" => 30.minutes.from_now.utc.xmlschema,
	      "conditions" =>  [ 
	        {"bucket" =>  ENV['S3BUCKET']}, 
	        ["starts-with", "$key", filename],
	        {"acl" => "private"},
	        {"success_action_status" => "200"},
	        ["content-length-range", 0, 1048576]
	      ]
	    }
		
		Base64.encode64(ret.to_json).gsub(/\n/,'')
  end



	  def s3_upload_signature(policy)
    	signature = Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha1'), ENV['S3SECRET'], policy)).gsub("\n","")
  	end
  	
  	
  	
  	
  	#CODE FOR THE FORM
  	
<% filename = "igot5onit.jpg" %>

<form id="AWS" action="https://whenwemarry-uploads.s3.amazonaws.com" method="post" enctype="multipart/form-data">
    <%= hidden_field_tag(:key, filename ) %>
    <%= hidden_field_tag(:AWSAccessKeyId, ENV['S3KEY']) %>
    <%= hidden_field_tag(:acl, "private") %>
    <%= hidden_field_tag(:success_action_status, "200") %>
    <%= hidden_field_tag(:policy, s3_upload_policy_document(filename)) %> 
    <%= hidden_field_tag(:signature, s3_upload_signature(s3_upload_policy_document(filename))) %> 

    <input id="ffileupload" type="file" name="file" multiple>
    
</form>

<div id="sub" style="border: solid 1px #CCC">SUBMIT</div>

<script type="text/javascript">
    $('#sub').click( function() 
        {
            $('#AWS').submit();
        });
</script>