Get a hash of hidden fields for form uploading to S3, in the form {:field_name => :field_value} Form should look like: <form action="#{bucket_name}.s3.amazonaws.com/" method="post" enctype="multipart/form-data"> These hidden fields should then appear, followed by a field named ‘file’ which is either a textarea or file input.

@param options Hash: @option options acl [String] access control list, in [‘private’, ‘public-read’, ‘public-read-write’, ‘authenticated-read’, ‘bucket-owner-read’, ‘bucket-owner-full-control’] @option options Cache-Control [String] same as REST header @option options Content-Type [String] same as REST header @option options Content-Disposition [String] same as REST header @option options Content-Encoding [String] same as REST header @option options Expires same as REST header @option options key key for object, set to ’${filename}’ to use filename provided by user @option options policy security policy for upload @option options success_action_redirect url to redirct to upon success @option options success_action_status status code to return on success, in [200, 201, 204] @option options x-amz-security token devpay security token @option options x-amz-meta… meta data tags

@see docs.amazonwebservices.com/AmazonS3/latest/dev/HTTPPOSTForms.html