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✏️ Editing: validator.rb

# frozen_string_literal: true
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require 'rubygems/package'
require 'rubygems/installer'

##
# Validator performs various gem file and gem database validation

class Gem::Validator

include Gem::UserInteraction

def initialize # :nodoc:
    require 'find'
  end

private

def find_files_for_gem(gem_directory)
    installed_files = []

Find.find gem_directory do |file_name|
      fn = file_name[gem_directory.size..file_name.size - 1].sub(/^\//, "")
      installed_files << fn unless
        fn =~ /CVS/ || fn.empty? || File.directory?(file_name)
    end

installed_files
  end

public

##
  # Describes a problem with a file in a gem.

ErrorData = Struct.new :path, :problem do
    def <=>(other) # :nodoc:
      return nil unless self.class === other

[path, problem] <=> [other.path, other.problem]
    end
  end

##
  # Checks the gem directory for the following potential
  # inconsistencies/problems:
  #
  # * Checksum gem itself
  # * For each file in each gem, check consistency of installed versions
  # * Check for files that aren't part of the gem but are in the gems directory
  # * 1 cache - 1 spec - 1 directory.
  #
  # returns a hash of ErrorData objects, keyed on the problem gem's name.
  #--
  # TODO needs further cleanup

def alien(gems=[])
    errors = Hash.new { |h,k| h[k] = {} }

Gem::Specification.each do |spec|
      next unless gems.include? spec.name unless gems.empty?
      next if spec.default_gem?

gem_name      = spec.file_name
      gem_path      = spec.cache_file
      spec_path     = spec.spec_file
      gem_directory = spec.full_gem_path

unless File.directory? gem_directory
        errors[gem_name][spec.full_name] =
          "Gem registered but doesn't exist at #{gem_directory}"
        next
      end

unless File.exist? spec_path
        errors[gem_name][spec_path] = "Spec file missing for installed gem"
      end

begin
        unless File.readable?(gem_path)
          raise Gem::VerificationError, "missing gem file #{gem_path}"
        end

good, gone, unreadable = nil, nil, nil, nil

File.open gem_path, Gem.binary_mode do |file|
          package = Gem::Package.new gem_path

good, gone = package.contents.partition do |file_name|
            File.exist? File.join(gem_directory, file_name)
          end

gone.sort.each do |path|
            errors[gem_name][path] = "Missing file"
          end

good, unreadable = good.partition do |file_name|
            File.readable? File.join(gem_directory, file_name)
          end

unreadable.sort.each do |path|
            errors[gem_name][path] = "Unreadable file"
          end

good.each do |entry, data|
            begin
              next unless data # HACK `gem check -a mkrf`

source = File.join gem_directory, entry['path']

File.open source, Gem.binary_mode do |f|
                unless f.read == data
                  errors[gem_name][entry['path']] = "Modified from original"
                end
              end
            end
          end
        end

installed_files = find_files_for_gem(gem_directory)
        extras = installed_files - good - unreadable

extras.each do |extra|
          errors[gem_name][extra] = "Extra file"
        end
      rescue Gem::VerificationError => e
        errors[gem_name][gem_path] = e.message
      end
    end

errors.each do |name, subhash|
      errors[name] = subhash.map do |path, msg|
        ErrorData.new path, msg
      end.sort
    end

errors
  end

end

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