Ensure S3 presigned default expires time is not changing #861
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It occurred to us that signatures end up invalid randomly because the default signature time is computed twice and we can end up with a policy that was signed for a policy with an expiration time 1 second earlier. To be specific, the policy is computed twice inside the `fields` method which uses the `formation_expiration` twice too, which in turn computes `Time.now` at two different times. @see marcel/aws-s3#54 (similar issue)
trevorrowe
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Jul 6, 2015
Ensure S3 presigned default expires time is not changing
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Good catch! Thanks for the patch. |
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It occurred to us that signatures end up invalid randomly because the default signature time is computed twice and we can end up with a policy that was signed for a policy with an expiration time 1 second earlier.
To be specific, the policy is computed twice inside the
fieldsmethod which uses theformation_expirationtwice too, which in turn computesTime.nowat two different times.https://github.com/didacte/aws-sdk-ruby/blob/bugfix/s3-presigned-default-expires/lib/aws/s3/presigned_post.rb#L345-L351
@see marcel/aws-s3#54 (similar issue)