Class: OnChain::Transaction

Inherits:
Object
  • Object
show all
Defined in:
lib/onchain/transaction.rb

Class Method Summary collapse

Class Method Details

.add_fee_to_tx(fee, fee_addr, tx, network = :bitcoin) ⇒ Object 



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# File 'lib/onchain/transaction.rb', line 97

def add_fee_to_tx(fee, fee_addr, tx, network = :bitcoin)
  
  # Add wallet fee
  if fee > 0 and (fee - 10000) > 0
    
    # Take the miners fee from the wallet fees
    fee = fee - 10000
    
    # Check for affiliate
    if fee_addr.kind_of?(Array)
      affil_fee = fee / 2
      txout1 = Bitcoin::Protocol::TxOut.new(affil_fee, to_address_script(fee_addr[0], network))
      txout2 = Bitcoin::Protocol::TxOut.new(affil_fee, to_address_script(fee_addr[1], network))
      tx.add_out(txout1)
      tx.add_out(txout2)
    else
      txout = Bitcoin::Protocol::TxOut.new(fee, to_address_script(fee_addr, network))
      tx.add_out(txout)
    end
  end
  
end

.calculate_fee(amount, fee_percent, min_fee_satoshi) ⇒ Object 



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# File 'lib/onchain/transaction.rb', line 180

def calculate_fee(amount, fee_percent, min_fee_satoshi)
  
  fee = (amount * (fee_percent / 100.0)).to_i
  
  if fee < min_fee_satoshi
    return min_fee_satoshi
  end
  
  return fee
end

.check_integrity(txhex, amount, orig_addresses, dest_addr, tolerence) ⇒ Object

Check a transactions inputs only spend enough to cover fees and amount Basically if onchain creates an incorrect transaction the client can identify it here.



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# File 'lib/onchain/transaction.rb', line 7

def check_integrity(txhex, amount, orig_addresses, dest_addr, tolerence)
  
  tx = Bitcoin::Protocol::Tx.new OnChain::hex_to_bin(txhex)
  
  input_amount = 0
  # Let's add up the value of all the inputs.
  tx.in.each_with_index do |txin, index|
  
    prev_hash = txin.to_hash['prev_out']['hash']
    prev_index = txin.to_hash['prev_out']['n']
    
    # Get the amount for the previous output
    prevhex = OnChain::BlockChain.get_transaction(prev_hash)
    prev_tx = Bitcoin::Protocol::Tx.new OnChain::hex_to_bin(prevhex)
    
    input_amount += prev_tx.out[prev_index].value
    
    if ! orig_addresses.include? prev_tx.out[prev_index].parsed_script.get_hash160_address
      raise "One of the inputs is not from from our list of valid originating addresses"
    end
  end
  
  # subtract the the chnage amounts
  tx.out.each do |txout|
    if orig_addresses.include? txout.parsed_script.get_address
      input_amount = input_amount - txout.value
    end
  end
  
  tolerence = (amount * (1 + tolerence)) 
  if input_amount > tolerence
    raise "Transaction has more input value (#{input_amount}) than the tolerence #{tolerence}"
  end
  
  return true
end

.create_single_address_transaction(orig_addr, dest_addr, amount, fee_percent, fee_addr, min_fee_satoshi, network = :bitcoin) ⇒ Object 



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# File 'lib/onchain/transaction.rb', line 44

def create_single_address_transaction(orig_addr, dest_addr, amount, 
  fee_percent, fee_addr, min_fee_satoshi, network = :bitcoin)

  tx = Bitcoin::Protocol::Tx.new
  
  fee = calculate_fee(amount, fee_percent, min_fee_satoshi)
  
  total_amount = amount + fee
  
  unspents, indexes, change = OnChain::BlockChain.get_unspent_for_amount(
    [orig_addr], total_amount, network)
  indexes = nil

  
  # Process the unpsent outs.
  unspents.each_with_index do |spent, index|

    txin = Bitcoin::Protocol::TxIn.new([ spent[0] ].pack('H*').reverse, spent[1])
    txin.script_sig = OnChain.hex_to_bin(spent[2])
    tx.add_in(txin)
  end
  txout = Bitcoin::Protocol::TxOut.new(amount, to_address_script(dest_addr, network))
  
  tx.add_out(txout)
  
  # Add wallet fee
  add_fee_to_tx(fee, fee_addr, tx, network)

  # Send the change back.
  if change > 0
    
    txout = Bitcoin::Protocol::TxOut.new(change, to_address_script(orig_addr, network))
  
    tx.add_out(txout)
  end

  inputs_to_sign = get_inputs_to_sign(tx)
  
  return OnChain::bin_to_hex(tx.to_payload), inputs_to_sign
end

.create_transaction(redemption_scripts, address, amount_in_satoshi, miners_fee, network = :bitcoin) ⇒ Object

Given a send address and an amount produce a transaction and a list of hashes that need to be signed.

The transaction will be in hex format.

The list of hashes that need to be signed will be in this format

[input index]=> { :hash => hash }

i.e.

0][:hash => ‘345435345…’
0][:hash => ‘122133445.…’


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# File 'lib/onchain/transaction.rb', line 238

def create_transaction(redemption_scripts, address, amount_in_satoshi, miners_fee, network = :bitcoin)

  total_amount = miners_fee
  
  total_amount = total_amount + amount_in_satoshi
  
  addresses = redemption_scripts.map { |rs| 
    generate_address_of_redemption_script(rs, network)
  }
  
  unspents, indexes, change = OnChain::BlockChain.get_unspent_for_amount(addresses, total_amount, network)
  
  # OK, let's build a transaction.
  tx = Bitcoin::Protocol::Tx.new
  
  # Process the unpsent outs.
  unspents.each_with_index do |spent, index|

    script = redemption_scripts[indexes[index]]
    
    txin = Bitcoin::Protocol::TxIn.new([ spent[0] ].pack('H*').reverse, spent[1])
    txin.script_sig = OnChain::hex_to_bin(script)
    tx.add_in(txin)
  end
  
  # Do we have enough in the fund.
  #if(total_amount > btc_balance)
  #  raise 'Balance is not enough to cover payment'
  #end

  txout = Bitcoin::Protocol::TxOut.new(amount_in_satoshi, 
      to_address_script(address, network))
  
  tx.add_out(txout)
  
  change_address = addresses[0]

  # Send the change back.
  if change > 0
  
    txout = Bitcoin::Protocol::TxOut.new(change, 
      to_address_script(change_address, network))
  
    tx.add_out(txout)
  end

  inputs_to_sign = get_inputs_to_sign tx

  return OnChain::bin_to_hex(tx.to_payload), inputs_to_sign
end

.create_transaction_with_fee(redemption_scripts, address, amount, fee_percent, fee_addr) ⇒ Object

Like create_single_address_transaction but for multi sig wallets.



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# File 'lib/onchain/transaction.rb', line 132

def create_transaction_with_fee(redemption_scripts, address, amount, fee_percent, fee_addr)

  fee = calculate_fee(amount, fee_percent, 10000)
  
  total_amount = amount + fee
  
  addresses = redemption_scripts.map { |rs| 
    generate_address_of_redemption_script(rs)
  }
  
  unspents, indexes, change = OnChain::BlockChain.get_unspent_for_amount(addresses, total_amount)
  
  # OK, let's build a transaction.
  tx = Bitcoin::Protocol::Tx.new
  
  # Process the unpsent outs.
  unspents.each_with_index do |spent, index|

    script = redemption_scripts[indexes[index]]
    
    txin = Bitcoin::Protocol::TxIn.new([ spent[0] ].pack('H*').reverse, spent[1])
    txin.script_sig = OnChain::hex_to_bin(script)
    tx.add_in(txin)
  end
  
  # Add wallet fee
  add_fee_to_tx(fee, fee_addr, tx)

  txout = Bitcoin::Protocol::TxOut.new(amount, Bitcoin::Script.to_address_script(address))
  
  tx.add_out(txout)
  
  change_address = addresses[0]

  # Send the change back.
  if change > 0
  
    txout = Bitcoin::Protocol::TxOut.new(change, 
      Bitcoin::Script.to_address_script(change_address))
  
    tx.add_out(txout)
  end

  inputs_to_sign = get_inputs_to_sign tx

  return OnChain::bin_to_hex(tx.to_payload), inputs_to_sign
end

.do_we_have_all_the_signatures(sig_list) ⇒ Object

Run through the signature list and check it is all signed.



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# File 'lib/onchain/transaction.rb', line 345

def do_we_have_all_the_signatures(sig_list)
  
  sig_list.each do |input|
    input.each_key do |public_key|
      if input[public_key]['hash'] == nil or input[public_key]['sig'] == nil
        return false
      end
    end
  end
  
  return true
end

.generate_address_of_redemption_script(redemption_script, network = :bitcoin) ⇒ Object 



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# File 'lib/onchain/transaction.rb', line 125

def generate_address_of_redemption_script(redemption_script)
  hash160 = Bitcoin.hash160(redemption_script)

  return Bitcoin.hash160_to_p2sh_address(hash160)
end

.generate_redemption_script(minimum_sigs, addresses) ⇒ Object 



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# File 'lib/onchain/transaction.rb', line 120

def generate_redemption_script(minimum_sigs, addresses)
  address, redeem_script = Bitcoin.pubkeys_to_p2sh_multisig_address(minimum_sigs, *addresses)
  return redeem_script.hth
end

.get_inputs_to_sign(tx) ⇒ Object 



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# File 'lib/onchain/transaction.rb', line 205

def get_inputs_to_sign(tx)
  inputs_to_sign = []
  tx.in.each_with_index do |txin, index|
    hash = tx.signature_hash_for_input(index, txin.script, 1)
    
    script = Bitcoin::Script.new txin.script
    
    pubkeys = get_public_keys_from_script(script)
    pubkeys.each do |key|
      
      if inputs_to_sign[index] == nil
        inputs_to_sign[index] = {}
      end
      inputs_to_sign[index][key] = {'hash' => OnChain::bin_to_hex(hash)}
    end
  end
  return inputs_to_sign
end

.get_public_keys_from_script(script) ⇒ Object 



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# File 'lib/onchain/transaction.rb', line 191

def get_public_keys_from_script(script)

  if script.is_hash160?
    return [Bitcoin.hash160_to_address(script.get_hash160)]
  end
  
  pubs = []
  script.get_multisig_pubkeys.each do |pub|
    pub_hex = OnChain.bin_to_hex(pub)
    pubs << Bitcoin.hash160_to_address(Bitcoin.hash160(pub_hex))
  end
  return pubs
end

.sign_transaction(transaction_hex, sig_list, pubkey = nil) ⇒ Object

Given a transaction in hex string format, apply the given signature list to it.

Signatures should be in the format

[0]=> {’hash’ => ‘345435345.…’, ‘sig’ => ‘435fgdf4553…’} [0]=> {’hash’ => ‘122133445.…’, ‘sig’ => ‘435fgdf4553…’}



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# File 'lib/onchain/transaction.rb', line 307

def sign_transaction(transaction_hex, sig_list, pubkey = nil)
  
  tx = Bitcoin::Protocol::Tx.new OnChain::hex_to_bin(transaction_hex)
  
  tx.in.each_with_index do |txin, index|
    
    sigs = []
    
    rscript = Bitcoin::Script.new txin.script
    
    pub_keys = get_public_keys_from_script(rscript)
    pub_keys.each do |hkey|
      
      if sig_list[index][hkey] != nil and sig_list[index][hkey]['sig'] != nil
        
        # Add the signature to the list.
        sigs << OnChain.hex_to_bin(sig_list[index][hkey]['sig'])
        
      end
    end
    
    if sigs.count > 0
      in_script = Bitcoin::Script.new txin.script
      if in_script.is_hash160?
        sig = sigs[0]
        txin.script = Bitcoin::Script.to_pubkey_script_sig(sig, OnChain.hex_to_bin(pubkey))
      else
        txin.script = Bitcoin::Script.to_p2sh_multisig_script_sig(rscript.to_payload, sigs)
      end
    end
  
    #raise "Signature error " + index.to_s  if ! tx.verify_input_signature(index, in_script.to_payload)
  end
  
  return OnChain::bin_to_hex(tx.to_payload)
end

.to_address_script(orig_addr, network = :bitcoin) ⇒ Object

The bitcoin ruby methods are not thread safe when switching between testnet and the bitcoin network.



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# File 'lib/onchain/transaction.rb', line 87

def to_address_script(orig_addr, network = :bitcoin)
  
  # TODO add thread safety.
  Bitcoin.network = network
  address = Bitcoin::Script.to_address_script(orig_addr)
  Bitcoin.network = :bitcoin
  
  return address
end