Module: BagIt::Validity

Included in:
Bag
Defined in:
lib/bagit/valid.rb

Instance Method Summary collapse

Instance Method Details

#complete? ⇒ Boolean

Return true if the manifest cover all files and all files are covered.

Returns:

  • (Boolean) 


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# File 'lib/bagit/valid.rb', line 22

def complete?
  logger = Logger.new(STDOUT)

  errors.add :completeness, "there are no manifest files" if manifest_files == []

  unmanifested_files.each do |file|
    logger.error("#{file} is present but not manifested".red)
    errors.add :completeness, "#{file} is present but not manifested"
  end

  empty_manifests.each do |file|
    logger.error("#{file} is manifested but not present".red)
    errors.add :completeness, "#{file} is manifested but not present"
  end
  tag_empty_manifests.each do |file|
    logger.error("#{file} is a manifested tag but not present".red)
    errors.add :completeness, "#{file} is a manifested tag but not present"
  end

  errors.on(:completeness).nil?
end

#consistent? ⇒ Boolean

Return true if all manifested files message digests match.

Returns:

  • (Boolean) 


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# File 'lib/bagit/valid.rb', line 62

def consistent?
  (manifest_files | tagmanifest_files).each do |mf|
    # get the algorithm implementation
    File.basename(mf) =~ /manifest-(.+).txt$/
    type = Regexp.last_match(1)
    algo = manifest_type(type)
    # Check every file in the manifest
    File.open(mf) do |io|
      io.each_line do |line|
        expected, path = line.chomp.split(/\s+/, 2)
        file = File.join(bag_dir, decode_filename(path))

        next unless File.exist? file
        actual = algo.file(file).hexdigest
        errors.add :consistency, "expected #{file} to have #{algo}: #{expected}, actual is #{actual}" if expected.downcase != actual
      end
    end
  end

  errors.on(:consistency).nil?
end

#decode_filename(s) ⇒ Object 



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# File 'lib/bagit/valid.rb', line 14

def decode_filename(s)
  s = s.gsub('%0D', "\r")
  s = s.gsub('%0A', "\n")
  s
end

#manifest_type(type) ⇒ Object 



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# File 'lib/bagit/valid.rb', line 44

def manifest_type(type)
  case type
  when /sha1/i
    Digest::SHA1
  when /md5/i
    Digest::MD5
  when /sha256/i
    Digest::SHA256
  when /sha384/i
    Digest::SHA384
  when /sha512/i
    Digest::SHA512
  else
    raise ArgumentError, "Algorithm #{manifest_type} is not supported."
  end
end

#valid_oxum? ⇒ Boolean

Checks for validity against Payload-Oxum

Returns:

  • (Boolean) 


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# File 'lib/bagit/valid.rb', line 85

def valid_oxum?
  bag_info["Payload-Oxum"] == payload_oxum
end