class BSON::Binary

Represents binary data.

@see bsonspec.org/#/specification

@since 2.0.0

Constants

BSON_TYPE

A binary is type 0x05 in the BSON spec.

@since 2.0.0

SUBTYPES

The mappings of subtypes to their single byte identifiers.

@since 2.0.0

TYPES

The mappings of single byte subtypes to their symbol counterparts.

@since 2.0.0

Attributes

data[R]

@return [ String ] The raw binary data.

The string is always stored in BINARY encoding.

@since 2.0.0

type[R]

@return [ Symbol ] The binary type.

@since 2.0.0

Public Class Methods

from_bson(buffer) click to toggle source

Deserialize the binary data from BSON.

@param [ ByteBuffer ] buffer The byte buffer.

@return [ Binary ] The decoded binary data.

@see bsonspec.org/#/specification

@since 2.0.0

# File lib/bson/binary.rb, line 236
def self.from_bson(buffer)
  length = buffer.get_int32
  type = TYPES[buffer.get_byte]
  length = buffer.get_int32 if type == :old
  data = buffer.get_bytes(length)
  new(data, type)
end
from_uuid(uuid, representation = nil) click to toggle source

Creates a BSON::Binary from a string representation of a UUID.

The UUID may be given in either 00112233-4455-6677-8899-aabbccddeeff or 00112233445566778899AABBCCDDEEFF format - specifically, any dashes in the UUID are removed and both upper and lower case letters are acceptable.

The input UUID string is always interpreted to be in the RFC 4122 format.

If representation is not provided, this method creates a BSON::Binary of subtype 4 (:uuid). If representation is provided, it must be one of :standard, :csharp_legacy, :java_legacy or :python_legacy. If representation is :standard, this method creates a subtype 4 (:uuid) binary which is the same behavior as if representation was not provided. For other representations, this method creates a Binary of subtype 3 (:uuid_old) with the UUID converted to the appropriate legacy MongoDB UUID storage format.

@param [ String ] uuid The string representation of the UUID. @param [ Symbol ] representation How to interpret the UUID.

@return [ Binary ] The binary.

@raise [ ArgumentError ] If invalid representation is requested.

@api experimental

# File lib/bson/binary.rb, line 269
def self.from_uuid(uuid, representation = nil)
  if representation.is_a?(String)
    raise ArgumentError, "Representation must be given as a symbol: #{representation}"
  end
  uuid_binary = uuid.gsub('-', '').scan(/../).map(&:hex).map(&:chr).join
  case representation && representation
  when nil, :standard
    new(uuid_binary, :uuid)
  when :csharp_legacy
    uuid_binary.sub!(/\A(.)(.)(.)(.)(.)(.)(.)(.)(.{8})\z/, '\4\3\2\1\6\5\8\7\9')
    new(uuid_binary, :uuid_old)
  when :java_legacy
    uuid_binary.sub!(/\A(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)\z/) do |m|
      "#{$8}#{$7}#{$6}#{$5}#{$4}#{$3}#{$2}#{$1}" +
      "#{$16}#{$15}#{$14}#{$13}#{$12}#{$11}#{$10}#{$9}"
    end
    new(uuid_binary, :uuid_old)
  when :python_legacy
    new(uuid_binary, :uuid_old)
  else
    raise ArgumentError, "Invalid representation: #{representation}"
  end
end
new(data = "", type = :generic) click to toggle source

Instantiate the new binary object.

This method accepts a string in any encoding; however, if a string is of a non-BINARY encoding, the encoding is set to BINARY. This does not change the bytes of the string but it means that applications referencing the data of a Binary instance cannot assume it is in a non-binary encoding, even if the string given to the constructor was in such an encoding.

@example Instantiate a binary.

BSON::Binary.new(data, :md5)

@param [ String ] data The raw binary data. @param [ Symbol ] type The binary type.

@since 2.0.0

# File lib/bson/binary.rb, line 117
def initialize(data = "", type = :generic)
  validate_type!(type)

  # The Binary class used to force encoding to BINARY when serializing to
  # BSON. Instead of doing that during serialization, perform this
  # operation during Binary construction to make it clear that once
  # the string is given to the Binary, the data is treated as a binary
  # string and not a text string in any encoding.
  unless data.encoding == Encoding.find('BINARY')
    data = data.dup.force_encoding('BINARY')
  end

  @data = data
  @type = type
end

Public Instance Methods

==(other) click to toggle source

Determine if this binary object is equal to another object.

@example Check the binary equality.

binary == other

@param [ Object ] other The object to compare against.

@return [ true, false ] If the objects are equal.

@since 2.0.0

# File lib/bson/binary.rb, line 72
def ==(other)
  return false unless other.is_a?(Binary)
  type == other.type && data == other.data
end
Also aliased as: eql?
as_json(*args) click to toggle source

Get the binary as JSON hash data.

@example Get the binary as a JSON hash.

binary.as_json

@return [ Hash ] The binary as a JSON hash.

@since 2.0.0

# File lib/bson/binary.rb, line 97
def as_json(*args)
  { "$binary" => Base64.encode64(data), "$type" => type }
end
eql?(other)
Alias for: ==
hash() click to toggle source

Generates a Fixnum hash value for this object.

Allows using Binary as hash keys.

@return [ Fixnum ]

@since 2.3.1

# File lib/bson/binary.rb, line 85
def hash
  data.hash + type.hash
end
inspect() click to toggle source

Get a nice string for use with object inspection.

@example Inspect the binary.

object_id.inspect

@return [ String ] The binary in form BSON::Binary:object_id

@since 2.3.0

# File lib/bson/binary.rb, line 141
def inspect
  "<BSON::Binary:0x#{object_id} type=#{type} data=0x#{data[0, 8].unpack('H*').first}...>"
end
to_bson(buffer = ByteBuffer.new, validating_keys = Config.validating_keys?) click to toggle source

Encode the binary type

@example Encode the binary.

binary.to_bson

@return [ BSON::ByteBuffer ] The buffer with the encoded object.

@see bsonspec.org/#/specification

@since 2.0.0

# File lib/bson/binary.rb, line 218
def to_bson(buffer = ByteBuffer.new, validating_keys = Config.validating_keys?)
  position = buffer.length
  buffer.put_int32(0)
  buffer.put_byte(SUBTYPES[type])
  buffer.put_int32(data.bytesize) if type == :old
  buffer.put_bytes(data)
  buffer.replace_int32(position, buffer.length - position - 5)
end
to_uuid(representation = nil) click to toggle source

Returns a string representation of the UUID stored in this Binary.

If the Binary is of subtype 4 (:uuid), this method returns the UUID in RFC 4122 format. If the representation parameter is provided, it must be the value :standard as a symbol or a string.

If the Binary is of subtype 3 (:uuid_old), this method requires that the representation parameter is provided and is one of :csharp_legacy, :java_legacy or :python_legacy or the equivalent strings. In this case the method assumes the Binary stores the UUID in the specified format, transforms the stored bytes to the standard RFC 4122 representation and returns the UUID in RFC 4122 format.

If the Binary is of another subtype, this method raises TypeError.

@param [ Symbol ] representation How to interpret the UUID.

@return [ String ] The string representation of the UUID.

@raise [ TypeError ] If the subtype of Binary is not :uuid nor :uuid_old. @raise [ ArgumentError ] If the representation other than :standard

is requested for Binary subtype 4 (:uuid), if :standard representation
is requested for Binary subtype 3 (:uuid_old), or if an invalid
representation is requested.

@api experimental

# File lib/bson/binary.rb, line 171
def to_uuid(representation = nil)
  if representation.is_a?(String)
    raise ArgumentError, "Representation must be given as a symbol: #{representation}"
  end
  case type
  when :uuid
    if representation && representation != :standard
      raise ArgumentError, "Binary of type :uuid can only be stringified to :standard representation, requested: #{representation.inspect}"
    end
    data.split('').map { |n| '%02x' % n.ord }.join.sub(/(.{8})(.{4})(.{4})(.{12})/, '\1-\2-\3-\4')
  when :uuid_old
    if representation.nil?
      raise ArgumentError, 'Representation must be specified for BSON::Binary objects of type :uuid_old'
    end

    hex = data.split('').map { |n| '%02x' % n.ord }.join

    case representation
    when :standard
      raise ArgumentError, 'BSON::Binary objects of type :uuid_old cannot be stringified to :standard representation'
    when :csharp_legacy
      hex.sub(/\A(..)(..)(..)(..)(..)(..)(..)(..)(.{16})\z/, '\4\3\2\1\6\5\8\7\9')
    when :java_legacy
      hex.sub(/\A(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)\z/) do |m|
        "#{$8}#{$7}#{$6}#{$5}#{$4}#{$3}#{$2}#{$1}" +
        "#{$16}#{$15}#{$14}#{$13}#{$12}#{$11}#{$10}#{$9}"
      end
    when :python_legacy
      hex
    else
      raise ArgumentError, "Invalid representation: #{representation}"
    end.sub(/(.{8})(.{4})(.{4})(.{12})/, '\1-\2-\3-\4')
  else
    raise TypeError, "The type of Binary must be :uuid or :uuid_old, this object is: #{type.inspect}"
  end
end

Private Instance Methods

validate_type!(type) click to toggle source

Validate the provided type is a valid type.

@api private

@example Validate the type.

binary.validate_type!(:user)

@param [ Object ] type The provided type.

@raise [ InvalidType ] The the type is invalid.

@since 2.0.0

# File lib/bson/binary.rb, line 343
def validate_type!(type)
  raise InvalidType.new(type) unless SUBTYPES.has_key?(type)
end