Expires time is calculated twice when using expires_in and can cause signature authentication problems #54
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j15e
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Jul 3, 2015
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)
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@bmo figured this out, I'm just the messenger.
The build method in QueryString calls #expires, and so does #encoded_canonical.
If these calls lie on separate sides of a second tick the signature will be wrong. The solution is to memoize the first call so encoded_canonical uses the same value.