Rails, Paperclip, Direct Upload to S3 - Authenticated URL returns SignatureDoesNotMatch response

Question

rails (~> 3.2.13)

paperclip (2.7.4)

aws-sdk (1.8.0)

In my Rails application using Paperclip, I have a model named "Asset" which has an attachment named "upload" (s3_permissions: "private").

This attachment is directly uploaded to Amazon S3 first and then the Asset is saved.For doing the direct upload I have used following gem https://github.com/waynehoover/s3_direct_upload gem by following instructions at the tutorial http://www.blitztheory.com/direct-upload-with-s3_direct_upload/

Note:

The one thing which I ignored from the tutorial is that I am not using the class method copy_and_delete(paperclip_file_path, raw_source) to recreate the asset in bucket at a desired path.

I uploaded an image "Mars.gif" from my view to Amazon S3 first and associated it with the my Asset object.The image is successfully uploaded to the bucket and the Asset also got saved successfully.However after saving the Asset when I am viewing its details and trying to open the attached "Mars.gif" using the image's source url:

http://s3.amazonaws.com/mm_tom_test/uploads%2F1390421005820-yff5taw7kgf-da8b488d45d747deb206977d29e11005%2FMars.gif?AWSAccessKeyId=AKIAIMKHM4EATOHUAQ3Q&Expires=1390433963&Signature=ehSbrI2bKE4jqQNHyPJKWDySMyU%3D&response-content-disposition=inline&response-content-type=image%2Fgif

I am encountering SignatureDoesNotMatch error.Please find below the XML returned by Amazon S3:

    
    
       SignatureDoesNotMatch
       The request signature we calculated does not match the signature you provided. Check your key and signing method.
       47 45 54 0a 0a 0a 31 33 39 30 34 33 33 39 36 33 0a 2f 6d 6d 5f 74 6f 6d 5f 74 65 73 74 2f 75 70 6c 6f 61 64 73 25 32 46 31 33 39 30 34 32 31 30 30 35 38 32 30 2d 79 66 66 35 74 61 77 37 6b 67 66 2d 64 61 38 62 34 38 38 64 34 35 64 37 34 37 64 65 62 32 30 36 39 37 37 64 32 39 65 31 31 30 30 35 25 32 46 4d 61 72 73 2e 67 69 66 3f 72 65 73 70 6f 6e 73 65 2d 63 6f 6e 74 65 6e 74 2d 64 69 73 70 6f 73 69 74 69 6f 6e 3d 69 6e 6c 69 6e 65 26 72 65 73 70 6f 6e 73 65 2d 63 6f 6e 74 65 6e 74 2d 74 79 70 65 3d 69 6d 61 67 65 2f 67 69 66
       9E297018ADD4D5AD
       EtMgiHpNfywzw7cNxAoCBFW5fY80LY3E5nTUuP182NfjzYqFTizIgjS+bgqPKM33
       ehSbrI2bKE4jqQNHyPJKWDySMyU=
       GET
    1390433963
    /mm_tom_test/uploads%2F1390421005820-yff5taw7kgf-da8b488d45d747deb206977d29e11005%2FMars.gif?response-content-disposition=inline&response-content-type=image/gif
       AKIAIMKHM4EATOHUAQ3Q

I had already spent enough hours to get this resolved with no success.I would really appreciate if anybody from the community can help me figure out what is causing this Signature Mismatch issue and how to get this resolved?

Listing below the code I have used:

/config/initializers/paperclip.rb

    Paperclip::ASSET_EXPIRATION_TIME = 3600.seconds

    Paperclip.interpolates(:key) do |attachment, style|
      attachment.instance.key
    end

    Paperclip.interpolates(:s3_conditional_url) do |attachment, style|
      attachment.expiring_url(Paperclip::ASSET_EXPIRATION_TIME, style)
    end

    module Paperclip::Storage::S3
      def public_url(style_name = default_style)
        if path
          "http://#{s3_host_name}/#{bucket_name}/#{path(style_name)}"
        end
      end

      def expiring_url(time = Paperclip::ASSET_EXPIRATION_TIME, style_name = default_style)
        if path
          s3_object(style_name).url_for(:read, :expires => time, :secure => use_secure_protocol?(style_name), :response_content_disposition => "inline",
        end
      end
    end

/config/amazon_s3.yml

development:
  access_key_id: 'AKIAIMKHM4EATOHUAQ3Q'
  secret_access_key: ''
  bucket: 'mm_tom_test'

/lib/s3_decider.rb

  module S3Decider
    def self.included(model)
      model.class_eval do
        if Paperclip::FILESYSTEM_ENVS.include?(Rails.env)
          @s3_decider = {
            :path => ":rails_root/public/assets/:class/:attachment/:id/:style/:basename.:extension",
            :url => "/assets/:class/:attachment/:id/:style/:basename.:extension"
          }
        else
          @s3_decider = {
            :storage        => :s3,
            :s3_credentials => "#{Rails.root}/config/amazon_s3.yml",
            :s3_permissions => "private",
            :s3_protocol    => Rails.env == "development" ? "http" : "https",
            :path           => ":class/:attachment/:id/:style.:extension",
            :url            => ":s3_conditional_url"
          }
        end
      end
    end
  end

/app/models/asset.rb

  class Asset < ActiveRecord::Base
    include S3Decider

    attr_accessible :upload, :upload_file_name, :upload_content_type, upload_file_size, :upload_updated_at

    paperclip_options_for_upload = @s3_decider.merge(
      path: ":key"
    )

    has_attached_file :upload, paperclip_options_for_upload

  end

Thanks.

Rails, Paperclip, Direct Upload to S3 - Authenticated URL returns SignatureDoesNotMatch response

Answers (1)

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