class Propshaft::Asset

# File lib/propshaft/asset.rb, line 9
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

# File lib/propshaft/asset.rb, line 17
def initialize(path, logical_path:, load_path:)
  @path, @logical_path, @load_path = path, Pathname.new(logical_path), load_path
end

# File lib/propshaft/asset.rb, line 71
def ==(other_asset)
  logical_path.hash == other_asset.logical_path.hash
end

# File lib/propshaft/asset.rb, line 21
def compiled_content
  @compiled_content ||= load_path.compilers.compile(self)
end

# File lib/propshaft/asset.rb, line 25
def content(encoding: "ASCII-8BIT")
  File.read(path, encoding: encoding, mode: "rb")
end

# File lib/propshaft/asset.rb, line 29
def content_type
  Mime::Type.lookup_by_extension(logical_path.extname.from(1))
end

# File lib/propshaft/asset.rb, line 37
def digest
  @digest ||= Digest::SHA1.hexdigest("#{content_with_compile_references}#{load_path.version}").first(8)
end

# File lib/propshaft/asset.rb, line 59
def digested_path
  if already_digested?
    logical_path
  else
    logical_path.sub(/\.(\w+(\.map)?)$/) { |ext| "-#{digest}#{ext}" }
  end
end

# File lib/propshaft/asset.rb, line 67
def fresh?(digest)
  self.digest == digest || already_digested?
end

# File lib/propshaft/asset.rb, line 41
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

# File lib/propshaft/asset.rb, line 33
def length
  content.size
end

# File lib/propshaft/asset.rb, line 80
def already_digested?
  logical_path.to_s =~ /-([0-9a-zA-Z_-]{7,128})\.digested/
end

# File lib/propshaft/asset.rb, line 76
def content_with_compile_references
  content + load_path.find_referenced_by(self).collect(&:content).join
end