I am developing code for salesforce. We are using 'Force.com for Amazon Web Services' App from Appexchange. The app is provided by Amazon.
I am downloading files from Amazon S3 on a machine.
Sometimes I am getting the below-mentioned error. Interesting thing is, only sometimes I get this error, rest of the times it works, even for the same file.
<Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>
The request signature we calculated does not match the signature you provided. Check your key and signing method.
I tried using both URL patterns provided by Amazon. Expires is set for 1hr after link generation, hence may not be an issue.
URL1:- http://adminportal.s3.amazonaws.com/sample.pdf?AWSAccessKeyId=AKIAIRUZSRRCVSLXZCIA&Expires=1372653478&Signature=RvMJ1gJL+qNKmnRkqzuytmlUTGQ=URL2:- http://s3.amazonaws.com/adminportal/sample.pdf?AWSAccessKeyId=AKIAIRUZSRRCVSLXZCIA&Expires=1372658253&Signature=%2FmI0m0PTlHJpJ%2FP5d%2FX3OApqzcI%3D
The signature is generated by class provided by Amazon, I guess it must work well all of the times.
Can someone elaborate why would S3 give this error only sometimes?
Sample URL for a file on Amazon S3 is-
The Signature is formed by classes rendered by Amazon.
For untold reasons, 'Force.com for Amazon Web Services' app might be generating signature which basically contains SPACES.
Example: In the given URL, space is substituted by '+'.
You just need to URL encode the signature in order to get rid of this problem. Encoding will substitute spaces with special characters and problems will be resolved.
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