Class: ItsyBtc::Commands::SignCommand

Inherits:
Command
  • Object
show all
Defined in:
lib/itsy-btc/commands/sign_command.rb

Instance Attribute Summary

Attributes inherited from Command

#wallet

Instance Method Summary collapse

Methods inherited from Command

args, name, summary

Constructor Details

#initialize(tx_path) ⇒ SignCommand

Returns a new instance of SignCommand.



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# File 'lib/itsy-btc/commands/sign_command.rb', line 8

def initialize(tx_path)
  @tx_path = tx_path
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/itsy-btc/commands/sign_command.rb', line 12

def run
  if @wallet.nil?
    puts "No wallet found! Use `itsy init` to create one."
    exit
  end

  tx = Bitcoin::Protocol::Tx.from_json_file(@tx_path)

  inputs_signed = 0
  tx.in.each.with_index do |txin, i|
    script = Bitcoin::Script.new(txin.script_sig)
    if script.type == :unknown
      puts "Input ##{i} already signed!"
      inputs_signed += 1
    else
      address = case script.type
                  when :hash160
                    script.get_hash160_address
                  when :pubkey
                    script.get_pubkey_address
                  else
                    nil
                  end
      if address
        if base58_key = @wallet.key_for_address(address)
          key = Bitcoin.open_key(Bitcoin::Key.from_base58(base58_key).priv)
          sig = Bitcoin.sign_data(key, tx.signature_hash_for_input(i, nil, txin.script_sig))
          txin.script_sig = Bitcoin::Script.to_signature_pubkey_script(sig, [key.public_key_hex].pack("H*"))
          puts "Input ##{i} signed."
          inputs_signed += 1
        else
          puts "Input ##{i} to address #{address} cannot be signed, that address is not in your wallet!"
        end
      else
        puts "Input ##{i} cannot be signed, its script type is #{script.type} which is unsupported."
      end
    end
  end

  tx = Bitcoin::Protocol::Tx.new(tx.to_payload)

  if inputs_signed == 0
    puts "No inputs signed."
  elsif inputs_signed == tx.in.length
    File.open("#{tx.hash}-signed.json", "w") { |f| f << tx.to_json }
    puts "Transaction signed, saved to #{tx.hash}-signed.json."
  else
    File.open("#{tx.hash}-signed#{inputs_signed}.json", "w") { |f| f << tx.to_json }
    puts "#{inputs_signed} of #{tx.in.length} inputs signed, saved to #{tx.hash}-signed#{inputs_signed}.json."
  end
end