Class: Mnam::TransactionBuilder::Transaction

Inherits:
Object
  • Object
show all
Defined in:
lib/mnam/transaction_builder.rb

Defined Under Namespace

Classes: Fee, Type

Instance Method Summary collapse

Constructor Details

#initialize(type:, fee:, sender_public_key: nil, recipient_id: nil, amount: nil, vendor_field: nil, asset: {}) ⇒ Transaction

Returns a new instance of Transaction.



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# File 'lib/mnam/transaction_builder.rb', line 39

def initialize(
  type:,
  fee:,
  sender_public_key: nil,
  recipient_id: nil,
  amount: nil,
  vendor_field: nil,
  asset: {}
)
  @type = type
  @fee = fee
  @sender_public_key = sender_public_key
  @recipient_id = recipient_id
  @amount = amount
  @vendor_field = vendor_field
  @timestamp = seconds_after_epoch
  @asset = asset
end

Instance Method Details

#sign_and_create_id(key, second_key = nil) ⇒ Object 



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# File 'lib/mnam/transaction_builder.rb', line 58

def sign_and_create_id(key, second_key = nil)
  transaction_bytes = to_bytes
  @signature = key.ecdsa_signature(Digest::SHA256.digest(transaction_bytes)).unpack('H*').first

  hashed_transaction_bytes_with_sig = Digest::SHA256.digest(to_bytes(false))

  @sign_signature = second_key.ecdsa_signature(hashed_transaction_bytes_with_sig).unpack('H*').first if second_key
  @id = Digest::SHA256.digest(to_bytes(false, false)).unpack('H*').first
end

#to_bytes(skip_signature = true, skip_second_signature = true) ⇒ Object 



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# File 'lib/mnam/transaction_builder.rb', line 68

def to_bytes(skip_signature = true, skip_second_signature = true)
  out = ''
  out << [type].pack('c')
  out << [timestamp].pack("V")
  out << [sender_public_key].pack('H*')
  if recipient_id
    out << BTC::Base58.data_from_base58check(recipient_id)
  else
    out << [].pack('x21')
  end

  if vendor_field
    out << vendor_field
    if vendor_field.size < 64
      out << [].pack("x#{64 - vendor_field.size}")
    end
  else
    out << [].pack("x64")
  end

  out << [amount].pack('Q<')
  out << [fee].pack('Q<')

  case type
  when Type::SECOND_SIGNATURE
    asset_signature_public_key = asset[:signature][:public_key]
    out << [asset_signature_public_key].pack('H*')
  when Type::DELEGATE
    out << asset[:delegate][:username]
  when Type::VOTE
    out << asset[:votes].join('')
  when Type::MULTISIGNATURE
    ms_asset = asset[:multisignature]
    out << [ms_asset[:min]].pack('C')
    out << [ms_asset[:lifetime]].pack('C')
    out << ms_asset[:keysgroup].join('')
  end

  if !skip_signature && signature
    out << [signature].pack('H*')
  end

  if !skip_second_signature && sign_signature
    out << [sign_signature].pack('H*')
  end

  out
end

#to_params ⇒ Object 



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# File 'lib/mnam/transaction_builder.rb', line 117

def to_params
  {
    :type => type,
    :amount => amount,
    :fee => fee,
    :vendorField => vendor_field,
    :timestamp => timestamp,
    :recipientId => recipient_id,
    :senderPublicKey => sender_public_key,
    :signature => signature,
    :id => id
 }.tap do |h|
    h[:asset] = asset.deep_transform_keys {|key| snake_case_to_camel_case(key)} if asset.any?
    h[:signSignature] = sign_signature if sign_signature
  end
end