class Bundler::RubyGemsGemInstaller

# File bundler/rubygems_gem_installer.rb, line 67
def build_extensions
  extension_cache_path = options[:bundler_extension_cache_path]
  unless extension_cache_path && extension_dir = spec.extension_dir
    require "shellwords" unless Bundler.rubygems.provides?(">= 3.2.25")
    return super
  end

  extension_dir = Pathname.new(extension_dir)
  build_complete = SharedHelpers.filesystem_access(extension_cache_path.join("gem.build_complete"), :read, &:file?)
  if build_complete && !options[:force]
    SharedHelpers.filesystem_access(extension_dir.parent, &:mkpath)
    SharedHelpers.filesystem_access(extension_cache_path) do
      FileUtils.cp_r extension_cache_path, spec.extension_dir
    end
  else
    require "shellwords" # compensate missing require in rubygems before version 3.2.25
    super
    if extension_dir.directory? # not made for gems without extensions
      SharedHelpers.filesystem_access(extension_cache_path.parent, &:mkpath)
      SharedHelpers.filesystem_access(extension_cache_path) do
        FileUtils.cp_r extension_dir, extension_cache_path
      end
    end
  end
end

# File bundler/rubygems_gem_installer.rb, line 7
def check_executable_overwrite(filename)
  # Bundler needs to install gems regardless of binstub overwriting
end

# File bundler/rubygems_gem_installer.rb, line 48
def generate_plugins
  return unless Gem::Installer.instance_methods(false).include?(:generate_plugins)

  latest = Gem::Specification.stubs_for(spec.name).first
  return if latest && latest.version > spec.version

  ensure_writable_dir @plugins_dir

  if spec.plugins.empty?
    remove_plugins_for(spec, @plugins_dir)
  else
    regenerate_plugins_for(spec, @plugins_dir)
  end
end

# File bundler/rubygems_gem_installer.rb, line 11
def install
  pre_install_checks

  run_pre_install_hooks

  spec.loaded_from = spec_file

  # Completely remove any previous gem files
  strict_rm_rf gem_dir
  strict_rm_rf spec.extension_dir

  SharedHelpers.filesystem_access(gem_dir, :create) do
    FileUtils.mkdir_p gem_dir, :mode => 0o755
  end

  extract_files

  build_extensions
  write_build_info_file
  run_post_build_hooks

  generate_bin
  generate_plugins

  write_spec

  SharedHelpers.filesystem_access("#{gem_home}/cache", :write) do
    write_cache_file
  end

  say spec.post_install_message unless spec.post_install_message.nil?

  run_post_install_hooks

  spec
end

# File bundler/rubygems_gem_installer.rb, line 63
def pre_install_checks
  super && validate_bundler_checksum(options[:bundler_expected_checksum])
end

# File bundler/rubygems_gem_installer.rb, line 152
def base64digest!(digest)
  if digest.respond_to?(:base64digest!)
    digest.base64digest!
  else
    [digest.digest!].pack("m0")
  end
end

# File bundler/rubygems_gem_installer.rb, line 140
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

# File bundler/rubygems_gem_installer.rb, line 148
def hexdigest!(digest)
  digest.hexdigest!
end

# File bundler/rubygems_gem_installer.rb, line 95
def strict_rm_rf(dir)
  # FileUtils.rm_rf should probably rise in case of permission issues like
  # `rm -rf` does. However, it fails to delete the folder silently due to
  # https://github.com/ruby/fileutils/issues/57. It should probably be fixed
  # inside `fileutils` but for now I`m checking whether the folder was
  # removed after it completes, and raising otherwise.
  FileUtils.rm_rf dir

  raise PermissionError.new(dir, :delete) if File.directory?(dir)
end

# File bundler/rubygems_gem_installer.rb, line 106
    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 = SharedHelpers.digest(:SHA256).new
        digest << io.read(16_384) until io.eof?
        io.rewind
        send(checksum_type(checksum), digest)
      end
      unless digest == checksum
        raise SecurityError, <<-MESSAGE
          Bundler cannot continue installing #{spec.name} (#{spec.version}).
          The checksum for the downloaded `#{spec.full_name}.gem` does not match \
          the checksum given by the server. This means the contents of the downloaded \
          gem is different from what was uploaded to the server, and could be a potential security issue.

          To resolve this issue:
          1. delete the downloaded gem located at: `#{spec.gem_dir}/#{spec.full_name}.gem`
          2. run `bundle install`

          If you wish to continue installing the downloaded gem, and are certain it does not pose a \
          security issue despite the mismatching checksum, do the following:
          1. run `bundle config set --local disable_checksum_validation true` to turn off checksum verification
          2. run `bundle install`

          (More info: The expected SHA256 checksum was #{checksum.inspect}, but the \
          checksum for the downloaded gem was #{digest.inspect}.)
          MESSAGE
      end
      true
    end