Class: AVP

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# File 'lib/diameter/avp.rb', line 82

class AVP
  include AVPType
  attr_reader :code, :mandatory

  include AVPParser

  def initialize(code, options = {})
    @code = code
    @content = options[:content] || ''
    @mandatory = options[:mandatory]
    @mandatory = true if @mandatory.nil?
  end

  # Creates an AVP by name, and assigns it a value.
  #
  # @param name The name of the AVP, e.g. "Origin-Host"
  # @param val The value of the AVP. Must be of the type defined for
  #   that AVP - e.g. a Fixnum for an AVP defined as Unsigned32, a
  #   String for an AVP defined as OctetString, or an IPAddr for an AVP
  #   defined as IPAddress.
  # @return [AVP] The AVP that was created.
  def self.create(name, val, options={})
    code, type, vendor = AVPNames.get(name)
    avp = if (vendor != 0)
            VendorSpecificAVP.new(code, vendor, options)
          else
            AVP.new(code, options)
          end

    set_content(avp, type, val)

    avp
  end

  # Returns this AVP encoded properly as bytes in network byte order,
  # suitable for sending over a TCP or SCTP connection. See
  # {http://tools.ietf.org/html/rfc6733#section-4.1} for the
  # format.
  #
  # @return [String] The bytes representing this AVP
  def to_wire
    length_8, length_16 = UInt24.to_u8_and_u16(@content.length + 8)
    avp_flags = @mandatory ? '01000000' : '00000000'
    header = [@code, avp_flags, length_8, length_16].pack('NB8Cn')
    header + self.padded_content
  end

  # Guessing the type of an AVP and displaying it sensibly is complex,
  # so this is a complex method (but one that has a unity of purpose,
  # so can't easily be broken down). Disable several Rubocop
  # complexity metrics to reflect this.

  # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity
  # rubocop:disable Metrics/MethodLength, Metrics/PerceivedComplexity

  # Returns a string representation of this AVP. Makes a best-effort
  # attempt to guess the type of the content (even for unknown AVPs)
  # and display it sensibly.
  #
  # @example
  #   avp.to_s => "AVP 267, mandatory: true, content as int32: 1"
  def to_s
    has_all_ascii_values =
      @content.bytes.reject { |c| (32 < c && c < 126) }.empty?

    could_be_32bit_num = (@content.length == 4)
    could_be_64bit_num = (@content.length == 8)

    could_be_ip = ((@content.length == 6 && @content[0..1] == "\x00\x01") ||
                   (@content.length == 18 && @content[0..1] == "\x00\x02"))

    maybe_grouped = !(has_all_ascii_values ||
                      could_be_64bit_num   ||
                      could_be_32bit_num   ||
                      could_be_ip)

    s = to_s_first_line
    s += ", content as string: #{@content}" if has_all_ascii_values
    s += ", content as int32: #{uint32}" if could_be_32bit_num
    s += ", content as int64: #{uint64}" if could_be_64bit_num
    s += ", content as ip: #{ip_address}" if could_be_ip
    s += ", grouped AVP, #{grouped_value.collect(&:to_s)}" if maybe_grouped

    s
  end
  # rubocop:enable Metrics/AbcSize, Metrics/CyclomaticComplexity
  # rubocop:enable Metrics/MethodLength, Metrics/PerceivedComplexity

  # @!attribute [r] vendor_specific? 
  #   @return [true, false] Whether this AVP is mandatory (i.e. its M flag is set)
  def vendor_specific?
    false
  end

  # @!group Data getters/setters for different AVP types
  
  # Returns this AVP's byte data, interpreted as a {http://tools.ietf.org/html/rfc6733#section-4.4 Grouped AVP}.
  #
  # @return [Array<AVP>] The contained AVPs.
  def grouped_value
    AVPParser::parse_avps_int(@content)
  end

  # Sets this AVP's byte data to a {http://tools.ietf.org/html/rfc6733#section-4.4 Grouped AVP}.
  #
  # @param [Array<AVP>] avps The AVPs that should be contained within
  #   this AVP.
  # @return [void]
  def grouped_value=(avps)
    new_content = ''
    avps.each { |a| new_content += a.to_wire }
    @content = new_content
  end

  # For a grouped AVP, returns the first AVP with this name it
  # contains.
  #
  # @param [String] name The AVP name
  # @return [AVP] if this AVP is found inside the Grouped AVP
  # @return [nil] if this AVP is not found inside the Grouped AVP
  def inner_avp(name)
    avps = inner_avps(name)

    if avps.empty?
      nil
    else
      avps[0]
    end
  end

  # For a grouped AVP, returns all AVPs it contains with this name.
  #
  # @param [String] name The AVP name
  # @return [Array<AVP>]
  def inner_avps(name)
    code, _type, _vendor = AVPNames.get(name)

    self.grouped_value.select { |a| a.code == code}
  end

  # Even though it is just "the raw bytes in the content",
  # octet_string is only one way of interpreting the AVP content and
  # shouldn't be treated differently to the others, so disable the
  # TrivialAccessors warning.

  # rubocop:disable Style/TrivialAccessors

  # Returns this AVP's byte data, interpreted as an OctetString.
  #
  # @return [String] The contained OctetString.
  def octet_string
    @content
  end

  # Sets this AVP's byte data to an OctetString.
  #
  # @param [String] value The octets to use as the value.
  # @return [void]
  def octet_string=(value)
    @content = value
  end

  # rubocop:enable Style/TrivialAccessors

  # Returns this AVP's byte data, interpreted as an Integer32.
  #
  # @return [Fixnum] The contained Integer32.
  def int32
    @content.unpack('l>')[0]
  end

  # Sets this AVP's byte data to an Integer32.
  #
  # @param [Fixnum] value
  # @return [void]
  def int32=(value)
    @content = [value].pack('l>')
  end

  # Returns this AVP's byte data, interpreted as an Integer64.
  #
  # @return [Fixnum] The contained Integer64.
  def int64
    @content.unpack('q>')[0]
  end

  # Sets this AVP's byte data to an Integer64.
  #
  # @param [Fixnum] value
  # @return [void]
  def int64=(value)
    @content = [value].pack('q>')
  end

  # Returns this AVP's byte data, interpreted as an Unsigned32.
  #
  # @return [Fixnum] The contained Unsigned32.
  def uint32
    @content.unpack('N')[0]
  end

  # Sets this AVP's byte data to an Unsigned32.
  #
  # @param [Fixnum] value
  # @return [void]
  def uint32=(value)
    @content = [value].pack('N')
  end

  # Returns this AVP's byte data, interpreted as an Unsigned64.
  #
  # @return [Fixnum] The contained Unsigned64.
  def uint64
    @content.unpack('Q>')[0]
  end

  # Sets this AVP's byte data to an Unsigned64.
  #
  # @param [Fixnum] value
  # @return [void]
  def uint64=(value)
    @content = [value].pack('Q>')
  end

  # Returns this AVP's byte data, interpreted as a Float32.
  #
  # @return [Float] The contained Float32.
  def float32
    @content.unpack('g')[0]
  end

  # Sets this AVP's byte data to a Float32.
  #
  # @param [Float] value
  # @return [void]
  def float32=(value)
    @content = [value].pack('g')
  end

  # Returns this AVP's byte data, interpreted as a Float64.
  #
  # @return [Float] The contained Float64.
  def float64
    @content.unpack('G')[0]
  end

  # Sets this AVP's byte data to a Float64.
  #
  # @param [Float] value
  # @return [void]
  def float64=(value)
    @content = [value].pack('G')
  end

  # Returns this AVP's byte data, interpreted as an {http://tools.ietf.org/html/rfc6733#section-4.3.1 Address}.
  #
  # @return [IPAddr] The contained {http://tools.ietf.org/html/rfc6733#section-4.3.1 Address}.
  def ip_address
    IPAddr.new_ntoh(@content[2..-1])
  end

  # Sets this AVP's byte data to an Address.
  #
  # @param [IPAddr] value
  # @return [void]
  def ip_address=(value)
    bytes = if value.ipv4?
              [1].pack('n')
            else
              [2].pack('n')
            end

    bytes += value.hton
    @content = bytes
  end

  # @!endgroup
  
  private
  
  def self.set_content(avp, type, val)
    case type
    when GROUPED
      avp.grouped_value = val
    when U32
      avp.uint32 = val
    when OCTETSTRING
      avp.octet_string = val
    when IPADDR
      avp.ip_address = val
    end
  end

  def to_s_first_line
    "AVP #{@code}, mandatory: #{@mandatory}"
  end

  protected
  def padded_content
    wire_content = @content
    while ((wire_content.length % 4) != 0)
      wire_content += "\x00"
    end
    wire_content
  end 
end

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# File 'lib/diameter/avp.rb', line 172

def vendor_specific?
  false
end