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require "active_support/core_ext/object/inclusion"
# A set of transformations that can be applied to a blob to create a variant.
class ActiveStorage::Variation
attr_reader :transformations
class << self
def decode(key)
new ActiveStorage.verifier.verify(key, purpose: :variation)
end
def encode(transformations)
ActiveStorage.verifier.generate(transformations, purpose: :variation)
end
end
def initialize(transformations)
@transformations = transformations
end
def transform(image)
transformations.each do |(method, argument)|
if eligible_argument?(argument)
image.public_send(method, argument)
else
image.public_send(method)
end
end
end
def key
self.class.encode(transformations)
end
private
def eligible_argument?(argument)
argument.present? && argument != true
end
end
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