feat: Address format implementation

lib/bech32.rb

@@ -0,0 +1,114 @@
+# Taken from https://github.com/sipa/bech32/blob/bdc264f84014c234e908d72026b7b780122be11f/ref/ruby/bech32.rb
+# Modified to add this function: https://github.com/sipa/bech32/blob/bdc264f84014c234e908d72026b7b780122be11f/ref/ruby/segwit_addr.rb#L64-L85
+
+# Copyright (c) 2017 Shigeyuki Azuchi
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+module Bech32
+
+  SEPARATOR = '1'
+
+  CHARSET = %w(q p z r y 9 x 8 g f 2 t v d w 0 s 3 j n 5 4 k h c e 6 m u a 7 l)
+
+  module_function
+
+  def convert_bits(data, from, to, padding=true)
+    acc = 0
+    bits = 0
+    ret = []
+    maxv = (1 << to) - 1
+    max_acc = (1 << (from + to - 1)) - 1
+    data.each do |v|
+      return nil if v < 0 || (v >> from) != 0
+      acc = ((acc << from) | v) & max_acc
+      bits += from
+      while bits >= to
+        bits -= to
+        ret << ((acc >> bits) & maxv)
+      end
+    end
+    if padding
+      ret << ((acc << (to - bits)) & maxv) unless bits == 0
+    elsif bits >= from || ((acc << (to - bits)) & maxv) != 0
+      return nil
+    end
+    ret
+  end
+
+  # Encode Bech32 string
+  def encode(hrp, data)
+    data = convert_bits(data.bytes, 8, 5)
+    checksummed = data + create_checksum(hrp, data)
+    hrp + SEPARATOR + checksummed.map{|i|CHARSET[i]}.join
+  end
+
+  # Decode a Bech32 string and determine hrp and data
+  def decode(bech)
+    # check invalid bytes
+    return nil if bech.scrub('?').include?('?')
+    # check uppercase/lowercase
+    return nil if (bech.downcase != bech && bech.upcase != bech)
+    bech.each_char{|c|return nil if c.ord < 33 || c.ord > 126}
+    bech = bech.downcase
+    # check data length
+    pos = bech.rindex(SEPARATOR)
+    return nil if pos.nil? || pos < 1 || pos + 7 > bech.length || bech.length > 90
+    # check valid charset
+    bech[pos+1..-1].each_char{|c|return nil unless CHARSET.include?(c)}
+    # split hrp and data
+    hrp = bech[0..pos-1]
+    data = bech[pos+1..-1].each_char.map{|c|CHARSET.index(c)}
+    # check checksum
+    return nil unless verify_checksum(hrp, data)
+    [hrp, convert_bits(data[0..-7], 5, 8, false).map(&:chr).join]
+  end
+
+  # Compute the checksum values given hrp and data.
+  def create_checksum(hrp, data)
+    values = expand_hrp(hrp) + data
+    polymod = polymod(values + [0, 0, 0, 0, 0, 0]) ^ 1
+    (0..5).map{|i|(polymod >> 5 * (5 - i)) & 31}
+  end
+
+  # Verify a checksum given Bech32 string
+  def verify_checksum(hrp, data)
+    polymod(expand_hrp(hrp) + data) == 1
+  end
+
+  # Expand the hrp into values for checksum computation.
+  def expand_hrp(hrp)
+    hrp.each_char.map{|c|c.ord >> 5} + [0] + hrp.each_char.map{|c|c.ord & 31}
+  end
+
+  # Compute Bech32 checksum
+  def polymod(values)
+    generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
+    chk = 1
+    values.each do |v|
+      top = chk >> 25
+      chk = (chk & 0x1ffffff) << 5 ^ v
+      (0..4).each{|i|chk ^= ((top >> i) & 1) == 0 ? 0 : generator[i]}
+    end
+    chk
+  end
+
+  private_class_method :polymod, :expand_hrp
+
+end

lib/ckb.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "bech32"
 require "ckb/version"
 require "ckb/api"
 require "ckb/blake2b"

lib/ckb/api.rb

@@ -13,12 +13,16 @@ class API
     attr_reader :uri
     attr_reader :system_script_out_point
     attr_reader :system_script_cell_hash
+    attr_reader :prefix
 
     DEFAULT_URL = "http://localhost:8114"
 
     MODE_TESTNET = "testnet"
     MODE_CUSTOM = "custom"
 
+    PREFIX_MAINNET = "ckb"
+    PREFIX_TESTNET = "ckt"
+
     def initialize(host: DEFAULT_URL, mode: MODE_TESTNET)
       @uri = URI(host)
       if mode == MODE_TESTNET
@@ -31,15 +35,29 @@ def initialize(host: DEFAULT_URL, mode: MODE_TESTNET)
         }
         cell_data = CKB::Utils.hex_to_bin(system_cell_transaction[:outputs][0][:data])
         cell_hash = CKB::Utils.bin_to_prefix_hex(CKB::Blake2b.digest(cell_data))
-        self.set_system_script_cell(out_point, cell_hash)
+        self.set_system_script_cell(out_point, cell_hash, prefix: PREFIX_TESTNET)
       end
     end
 
     # @param out_point [Hash] { hash: "0x...", index: 0 }
     # @param cell_hash [String] "0x..."
-    def set_system_script_cell(out_point, cell_hash)
+    def set_system_script_cell(out_point, cell_hash, prefix: PREFIX_MAINNET)
       @system_script_out_point = out_point
       @system_script_cell_hash = cell_hash
+      @prefix = prefix
+    end
+
+    # Generates address assuming default lock script is used
+    def generate_address(pubkey_hash)
+      Bech32.encode(prefix, "\x00\x00\x00\x00\x00\x02" + pubkey_hash)
+    end
+
+    # Parse address into lock assuming default lock script is used
+    def parse_address(address)
+      prefix, data = Bech32.decode(address)
+      raise "Invalid prefix" if prefix != @prefix
+      raise "Invalid version/type/script" if data.slice(0..5) != "\x00\x00\x00\x00\x00\x02"
+      data.slice(6..-1)
     end
 
     def system_script_cell

lib/ckb/wallet.rb

@@ -46,15 +46,15 @@ def get_balance
       get_unspent_cells.map { |cell| cell[:capacity] }.reduce(0, &:+)
     end
 
-    def generate_tx(target_lock, capacity)
+    def generate_tx(target_address, capacity)
       i = gather_inputs(capacity, MIN_CELL_CAPACITY)
       input_capacities = i.capacities
 
       outputs = [
         {
           capacity: capacity,
           data: "",
-          lock: target_lock
+          lock: generate_lock(api.parse_address(target_address))
         }
       ]
       if input_capacities > capacity
@@ -72,10 +72,10 @@ def generate_tx(target_lock, capacity)
       }
     end
 
-    # @param target_lock [Hash]
+    # @param target_address [String]
     # @param capacity [Integer]
-    def send_capacity(target_lock, capacity)
-      tx = generate_tx(target_lock, capacity)
+    def send_capacity(target_address, capacity)
+      tx = generate_tx(target_address, capacity)
       send_transaction_bin(tx)
     end
 
@@ -84,16 +84,6 @@ def get_transaction(hash_hex)
       api.get_transaction(hash_hex)
     end
 
-    def lock
-      @lock ||= {
-        version: 0,
-        binary_hash: api.system_script_cell_hash,
-        args: [
-          CKB::Utils.bin_to_hex(CKB::Blake2b.digest(CKB::Blake2b.digest(pubkey_bin)))
-        ]
-      }
-    end
-
     def block_assembler_config
       args = lock[:args].map do |arg|
         "[#{arg.bytes.map(&:to_s).join(", ")}]"
@@ -105,6 +95,10 @@ def block_assembler_config
      ).strip
     end
 
+    def address
+      api.generate_address(pubkey_hash_bin)
+    end
+
     private
 
     def send_transaction_bin(transaction)
@@ -141,9 +135,27 @@ def pubkey_bin
       CKB::Utils.extract_pubkey_bin(privkey)
     end
 
+    def pubkey_hash_bin
+      CKB::Blake2b.digest(CKB::Blake2b.digest(pubkey_bin))
+    end
+
     def lock_hash
       @lock_hash ||= CKB::Utils.json_script_to_type_hash(lock)
     end
+
+    def lock
+      @lock ||= generate_lock(pubkey_hash_bin)
+    end
+
+    def generate_lock(target_pubkey_hash_bin)
+      {
+        version: 0,
+        binary_hash: api.system_script_cell_hash,
+        args: [
+          CKB::Utils.bin_to_hex(target_pubkey_hash_bin)
+        ]
+      }
+    end
   end
 end