Generate AWS - S3 Policy and Signature
S3 accepts uploads via specially-crafted and pre-authorized HTML POST Form.
A simple gem will help you create two values: Signature and Policy - https://github.com/vinhnglx/s3-authorize
This gem is very useful when working with AngularJS file upload
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The aws-sdk gem already supports generating fields for direct S3 upload: http://docs.aws.amazon.com/sdkforruby/api/Aws/S3/Bucket.html#presigned_post-instance_method
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