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Contents
class Shrine
module Plugins
# Using the shrine signature and add_metadata plugins, ensure that the shrine standard
# digest/checksum signatures are recorded in metadata.
#
# This plugin is NOT included in Kithe::AssetUploader by default, include it in your
# local uploader if desired.
#
# We want to store md5 and sha1 checksums (legacy compat), as well as
# sha512 (more recent digital preservation recommendation: https://ocfl.io/draft/spec/#digests)
#
# We only calculate them only on promotion action (not cache action), to avoid needlessly
# expensive double-computation, and because for direct uploads/backgrounding, we haven't
# actually gotten the file in our hands to compute checksums until then anyway.
#
# the add_metadata plugin's `metadata_method` is used to make md5, sha1, and sha512 methods
# available on the Attacher. (They also end up delegated from the Asset model)
class KitheChecksumSignatures
def self.load_dependencies(uploader, *)
uploader.plugin :add_metadata
uploader.plugin :signature
end
def self.configure(uploader, opts = {})
uploader.class_eval do
add_metadata do |io, derivative:nil, **context|
if context[:action] != :cache && derivative.nil?
{
md5: calculate_signature(io, :md5),
sha1: calculate_signature(io, :sha1),
sha512: calculate_signature(io, :sha512)
}
end
end
metadata_method :md5, :sha1, :sha512
end
end
end
register_plugin(:kithe_checksum_signatures, KitheChecksumSignatures)
end
end
Version data entries
26 entries across 26 versions & 1 rubygems