Class: RCS::CoinTransaction

Inherits:
Object
  • Object
show all
Defined in:
lib/rcs-common/evidence/money.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, vds, seed) ⇒ CoinTransaction

Returns a new instance of CoinTransaction.



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# File 'lib/rcs-common/evidence/money.rb', line 529

def initialize(id, vds, seed)
  @id = id.reverse.unpack("H*").first
  @seed = seed
  @in = []
  @out = []

  tx = parse_tx(vds)

  calculate_tx(tx)

rescue Exception => e
  raise "Cannot parse Transaction: #{e.message}"
end

Instance Attribute Details

#amount ⇒ Object (readonly)

Returns the value of attribute amount.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def amount
  @amount
end

#from ⇒ Object (readonly)

Returns the value of attribute from.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def from
  @from
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def id
  @id
end

#in ⇒ Object (readonly)

Returns the value of attribute in.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def in
  @in
end

#out ⇒ Object (readonly)

Returns the value of attribute out.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def out
  @out
end

#time ⇒ Object (readonly)

Returns the value of attribute time.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def time
  @time
end

#to ⇒ Object (readonly)

Returns the value of attribute to.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def to
  @to
end

#versus ⇒ Object (readonly)

Returns the value of attribute versus.



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# File 'lib/rcs-common/evidence/money.rb', line 527

def versus
  @versus
end

Instance Method Details

#calculate_tx(tx) ⇒ Object 



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# File 'lib/rcs-common/evidence/money.rb', line 543

def calculate_tx(tx)
  tx['txIn'].each do |t|
    itx = {}
    # search in the previous hash repo
    itx[:prevout_hash] = t['prevout_hash'].reverse.unpack('H*').first
    itx[:prevout_index] = t['prevout_n']
    @in << itx
  end

  tx['txOut'].each do |t|
    next unless t['value']
    value = t['value']/1.0e8

    address = extract_pubkey(t['scriptPubKey'])
    @out << {value: value, address: address} if address
  end

  @time = tx['timeReceived']
  @versus = (tx['fromMe'] == true) ? :out : :in
end

#extract_pubkey(bytes) ⇒ Object 



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# File 'lib/rcs-common/evidence/money.rb', line 637

def extract_pubkey(bytes)
  # here we should parse the OPCODES and check them, but we are lazy
  # and we fake the full parsing... :)

  address = nil

  case bytes.bytesize
    # TODO: implement other opcodes
    when 132
      # non-generated TxIn transactions push a signature
      # (seventy-something bytes) and then their public key
      # (33 or 65 bytes) onto the stack:
    when 67
      # The Genesis Block, self-payments, and pay-by-IP-address payments look like:
      # 65 BYTES:... CHECKSIG
    when 25
      # Pay-by-Bitcoin-address TxOuts look like:
      # DUP HASH160 20 BYTES:... EQUALVERIFY CHECKSIG
      # [ OP_DUP, OP_HASH160, OP_PUSHDATA4, OP_EQUALVERIFY, OP_CHECKSIG ]
      op_prefix = bytes[0..2]
      op_suffix = bytes[-2..-1]

      if op_prefix.eql? "\x76\xa9\x14".force_encoding('ASCII-8BIT') and
         op_suffix.eql? "\x88\xac".force_encoding('ASCII-8BIT')
        address = B58Encode.hash_160_to_bc_address(bytes[3..-3], @seed)
      end
    when 23
      # BIP16 TxOuts look like:
      # HASH160 20 BYTES:... EQUAL
  end

  return address
rescue
end

#parse_merkle_tx(vds) ⇒ Object 



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# File 'lib/rcs-common/evidence/money.rb', line 594

def parse_merkle_tx(vds)
  h = parse_transaction(vds)
  h['hashBlock'] = vds.read_bytes(32)
  n_merkleBranch = vds.read_compact_size
  h['merkleBranch'] = vds.read_bytes(32*n_merkleBranch)
  h['nIndex'] = vds.read_int32
  return h
end

#parse_transaction(vds) ⇒ Object 



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# File 'lib/rcs-common/evidence/money.rb', line 603

def parse_transaction(vds)
  h = {}
  start_pos = vds.read_cursor
  h['version'] = vds.read_int32

  n_vin = vds.read_compact_size
  h['txIn'] = []
  (1..n_vin).each {  h['txIn'] << parse_TxIn(vds)  }

  n_vout = vds.read_compact_size
  h['txOut'] = []
  (1..n_vout).each { h['txOut'] << parse_TxOut(vds) }

  h['lockTime'] = vds.read_uint32
  h['__data__'] = vds.buffer[start_pos..vds.read_cursor-1]
  return h
end

#parse_tx(vds) ⇒ Object 



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# File 'lib/rcs-common/evidence/money.rb', line 564

def parse_tx(vds)
  h = parse_merkle_tx(vds)
  n_vtxPrev = vds.read_compact_size
  h['vtxPrev'] = []
  (1..n_vtxPrev).each { h['vtxPrev'] << parse_merkle_tx(vds) }

  h['mapValue'] = {}
  n_mapValue = vds.read_compact_size
  (1..n_mapValue).each do
    key = vds.read_string
    value = vds.read_string
    h['mapValue'][key] = value
  end

  n_orderForm = vds.read_compact_size
  h['orderForm'] = []
  (1..n_orderForm).each do
    first = vds.read_string
    second = vds.read_string
    h['orderForm'] << [first, second]
  end

  h['fTimeReceivedIsTxTime'] = vds.read_uint32
  h['timeReceived'] = vds.read_uint32
  h['fromMe'] = vds.read_boolean
  h['spent'] = vds.read_boolean

  return h
end

#parse_TxIn(vds) ⇒ Object 



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# File 'lib/rcs-common/evidence/money.rb', line 621

def parse_TxIn(vds)
  h = {}
  h['prevout_hash'] = vds.read_bytes(32)
  h['prevout_n'] = vds.read_uint32
  h['scriptSig'] = vds.read_bytes(vds.read_compact_size)
  h['sequence'] = vds.read_uint32
  return h
end

#parse_TxOut(vds) ⇒ Object 



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# File 'lib/rcs-common/evidence/money.rb', line 630

def parse_TxOut(vds)
  h = {}
  h['value'] = vds.read_int64
  h['scriptPubKey'] = vds.read_bytes(vds.read_compact_size)
  return h
end