How to validate signed identifier from IOS in rails backend

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ein Selbst

• October 20, 2014 09:23

Hi,

we want to use safe mobile upload with a server side pre-generated signature. In the IOS SDK it is mentioned that a "signedIdentifier" can be generated with

NSString *signedIdentifier = [cloudinary signedPreloadedImage:uploadResponse];

 

How do I validate this response string in my rails backend? I couldn't find any documentation. The closest I found was a blog post where someone recreated the signature from all params and than compared it to the one returned by the client. He didn't use the aforementioned  signedIdentifier.

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• 

  Itay Taragano

  • October 25, 2014 21:14

  Please note that you can also upload images without the need of generating a signature. For more information about unsigned uploads (which includes iOS sample code):
  
  http://cloudinary.com/blog/direct_upload_made_easy_from_browser_or_mobile_app_to_the_cloud

  Regarding Ruby validation of signature - You can use  Cloudinary::PreloadedFile  as shown here: http://cloudinary.com/documentation/rails_image_upload#direct_upload_file_tag

  The identifier sent by the iOS code is the same as the one in the jQuery direct upload example.
  
  If you use CarrierWare, assigning the signed identifier is automatically validated.

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  ein Selbst

  • November 05, 2014 00:22

  Thank you, this helped.

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