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require "digest/sha1"
require "digest/sha2"
require "action_dispatch/http/mime_type"
class Propshaft::Asset
attr_reader :path, :logical_path, :load_path
class << self
def extract_path_and_digest(digested_path)
digest = digested_path[/-([0-9a-zA-Z]{7,128})\.(?!digested)([^.]|.map)+\z/, 1]
path = digest ? digested_path.sub("-#{digest}", "") : digested_path
[path, digest]
end
end
def initialize(path, logical_path:, load_path:)
@path, @logical_path, @load_path = path, Pathname.new(logical_path), load_path
end
def compiled_content
@compiled_content ||= load_path.compilers.compile(self)
end
def content(encoding: "ASCII-8BIT")
File.read(path, encoding: encoding, mode: "rb")
end
def content_type
Mime::Type.lookup_by_extension(logical_path.extname.from(1))
end
def length
content.size
end
def digest
@digest ||= Digest::SHA1.hexdigest("#{content_with_compile_references}#{load_path.version}").first(8)
end
def integrity(hash_algorithm:)
# Following the Subresource Integrity spec draft
# https://w3c.github.io/webappsec-subresource-integrity/
# allowing only sha256, sha384, and sha512
bitlen = case hash_algorithm
when "sha256"
256
when "sha384"
384
when "sha512"
512
else
raise(StandardError.new("Subresource Integrity hash algorithm must be one of SHA2 family (sha256, sha384, sha512)"))
end
[hash_algorithm, Digest::SHA2.new(bitlen).base64digest(compiled_content)].join("-")
end
def digested_path
if already_digested?
logical_path
else
logical_path.sub(/\.(\w+(\.map)?)$/) { |ext| "-#{digest}#{ext}" }
end
end
def fresh?(digest)
self.digest == digest || already_digested?
end
def ==(other_asset)
logical_path.hash == other_asset.logical_path.hash
end
private
def content_with_compile_references
content + load_path.find_referenced_by(self).collect(&:content).join
end
def already_digested?
logical_path.to_s =~ /-([0-9a-zA-Z_-]{7,128})\.digested/
end
end
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