124 lines
3.3 KiB
Ruby
124 lines
3.3 KiB
Ruby
# frozen_string_literal: false
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if defined?(Digest) &&
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/\A(?:2\.|3\.0\.[0-2]\z)/.match?(RUBY_VERSION) &&
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caller_locations.any? { |l|
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%r{/(rubygems/gem_runner|bundler/cli)\.rb}.match?(l.path)
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}
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# Before Ruby 3.0.3/3.1.0, the gem and bundle commands used to load
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# the digest library before loading additionally installed gems, so
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# you will get constant redefinition warnings and unexpected
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# implementation overwriting if we proceed here. Avoid that.
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return
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end
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require 'digest/version'
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require 'digest/loader'
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module Digest
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# A mutex for Digest().
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REQUIRE_MUTEX = Thread::Mutex.new
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def self.const_missing(name) # :nodoc:
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case name
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when :SHA256, :SHA384, :SHA512
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lib = 'digest/sha2'
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else
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lib = File.join('digest', name.to_s.downcase)
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end
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begin
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require lib
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rescue LoadError
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raise LoadError, "library not found for class Digest::#{name} -- #{lib}", caller(1)
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end
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unless Digest.const_defined?(name)
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raise NameError, "uninitialized constant Digest::#{name}", caller(1)
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end
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Digest.const_get(name)
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end
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class ::Digest::Class
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# Creates a digest object and reads a given file, _name_.
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# Optional arguments are passed to the constructor of the digest
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# class.
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#
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# p Digest::SHA256.file("X11R6.8.2-src.tar.bz2").hexdigest
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# # => "f02e3c85572dc9ad7cb77c2a638e3be24cc1b5bea9fdbb0b0299c9668475c534"
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def self.file(name, *args)
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new(*args).file(name)
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end
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# Returns the base64 encoded hash value of a given _string_. The
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# return value is properly padded with '=' and contains no line
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# feeds.
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def self.base64digest(str, *args)
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[digest(str, *args)].pack('m0')
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end
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end
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module Instance
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# Updates the digest with the contents of a given file _name_ and
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# returns self.
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def file(name)
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File.open(name, "rb") {|f|
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buf = ""
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while f.read(16384, buf)
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update buf
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end
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}
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self
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end
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# If none is given, returns the resulting hash value of the digest
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# in a base64 encoded form, keeping the digest's state.
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#
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# If a +string+ is given, returns the hash value for the given
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# +string+ in a base64 encoded form, resetting the digest to the
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# initial state before and after the process.
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#
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# In either case, the return value is properly padded with '=' and
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# contains no line feeds.
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def base64digest(str = nil)
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[str ? digest(str) : digest].pack('m0')
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end
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# Returns the resulting hash value and resets the digest to the
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# initial state.
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def base64digest!
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[digest!].pack('m0')
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end
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end
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end
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# call-seq:
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# Digest(name) -> digest_subclass
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#
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# Returns a Digest subclass by +name+ in a thread-safe manner even
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# when on-demand loading is involved.
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#
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# require 'digest'
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#
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# Digest("MD5")
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# # => Digest::MD5
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#
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# Digest(:SHA256)
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# # => Digest::SHA256
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#
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# Digest(:Foo)
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# # => LoadError: library not found for class Digest::Foo -- digest/foo
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def Digest(name)
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const = name.to_sym
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Digest::REQUIRE_MUTEX.synchronize {
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# Ignore autoload's because it is void when we have #const_missing
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Digest.const_missing(const)
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}
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rescue LoadError
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# Constants do not necessarily rely on digest/*.
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if Digest.const_defined?(const)
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Digest.const_get(const)
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else
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raise
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end
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end
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