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# frozen_string_literal: true
require "rubygems/installer"
module Bundler
class RubyGemsGemInstaller < Gem::Installer
unless respond_to?(:at)
def self.at(*args)
new(*args)
end
end
def check_executable_overwrite(filename)
# Bundler needs to install gems regardless of binstub overwriting
end
def pre_install_checks
super && validate_bundler_checksum(options[:bundler_expected_checksum])
end
private
def validate_bundler_checksum(checksum)
return true if Bundler.settings[:disable_checksum_validation]
return true unless checksum
return true unless source = @package.instance_variable_get(:@gem)
return true unless source.respond_to?(:with_read_io)
digest = source.with_read_io do |io|
digest = Digest::SHA256.new
digest << io.read(16_384) until io.eof?
io.rewind
send(checksum_type(checksum), digest)
end
unless digest == checksum
raise SecurityError,
"The checksum for the downloaded `#{spec.full_name}.gem` did not match " \
"the checksum given by the API. This means that the contents of the " \
"gem appear to be different from what was uploaded, and could be an indicator of a security issue.\n" \
"(The expected SHA256 checksum was #{checksum.inspect}, but the checksum for the downloaded gem was #{digest.inspect}.)\n" \
"Bundler cannot continue installing #{spec.name} (#{spec.version})."
end
true
end
def checksum_type(checksum)
case checksum.length
when 64 then :hexdigest!
when 44 then :base64digest!
else raise InstallError, "The given checksum for #{spec.full_name} (#{checksum.inspect}) is not a valid SHA256 hexdigest nor base64digest"
end
end
def hexdigest!(digest)
digest.hexdigest!
end
def base64digest!(digest)
if digest.respond_to?(:base64digest!)
digest.base64digest!
else
[digest.digest!].pack("m0")
end
end
end
end
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