22 lines
497 B
Ruby
22 lines
497 B
Ruby
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module AssetSignature
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DELIMITER = '-'
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def self.generate(asset)
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"#{asset.id}#{DELIMITER}#{generate_hmac(asset.class, asset.id)}"
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end
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def self.find_by_signature(klass, signature)
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id, hmac = signature.split(DELIMITER, 2)
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return nil unless Canvas::Security.verify_hmac_sha1(hmac, "#{klass}#{id}", truncate: 8)
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klass.where(id: id.to_i).first
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end
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private
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def self.generate_hmac(klass, id)
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data = "#{klass}#{id}"
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Canvas::Security.hmac_sha1(data)[0,8]
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end
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end
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