Add Faker::Tezos

CHANGELOG.md

@@ -27,6 +27,7 @@
 - [PR #1329](https://github.com/stympy/faker/pull/1329) Update docs on behavior of price [@softwaregravy](https://github.com/softwaregravy)
 
 ### Feature Request
+- [PR #1359](https://github.com/stympy/faker/pull/1359) Add Faker::Tezos [@Pierre-Michard](https://github.com/Pierre-Michard)
 - [PR #1366](https://github.com/stympy/faker/pull/1366) Add Faker::Seinfeld.business [@dsgraham](https://github.com/dsgraham)
 - [PR #1358](https://github.com/stympy/faker/pull/1358) Add cat breed for Japanese [@yizknn](https://github.com/yizknn)
 - [PR #1365](https://github.com/stympy/faker/pull/1365) Add Faker::Number.within [@QuantumWaver](https://github.com/QuantumWaver)

README.md

@@ -156,6 +156,7 @@ Contents
   - [Faker::Superhero](doc/superhero.md)
   - [Faker::SwordArtOnline](doc/sword_art_online.md)
   - [Faker::Team](doc/team.md)
+  - [Faker::Tezos](doc/tezos.md)
   - [Faker::TheFreshPrinceOfBelAir](doc/the_fresh_prince_of_bel_air.md)
   - [Faker::TheITCrowd](doc/the_it_crowd.md)
   - [Faker::TheThickOfIt](doc/the_thick_of_it.md)

doc/tezos.md

@@ -0,0 +1,13 @@
+# Faker::Tezos
+
+It might be available in the next version.
+
+```ruby
+Faker::Tezos.account #=> "tz1eUsgK6aj752Fbxwk5sAoEFvSDnPjZ4qvk"
+
+Faker::Tezos.contract #=> "KT1MroqeP15nnitB4CnNfkqHYa2NErhPPLWF"
+
+Faker::Tezos.operation #=> "onygWYXJX3xNstFLv9PcCrhQdCkENC795xwSinmTEc1jsDN4VDa"
+
+Faker::Tezos.signature #=> "edsigu165B7VFf3Dpw2QABVzEtCxJY2gsNBNcE3Ti7rRxtDUjqTFRpg67EdAQmY6YWPE5tKJDMnSTJDFu65gic8uLjbW2YwGvAZ"
+```

lib/faker.rb

@@ -230,3 +230,4 @@ def rand(max = nil)
 
 require 'helpers/char'
 require 'helpers/unique_generator'
+require 'helpers/base58'

lib/faker/bitcoin.rb

@@ -21,28 +21,11 @@ def testnet_address
 
       protected
 
-      def base58(str)
-        alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
-        base = alphabet.size
-
-        lv = 0
-        str.split('').reverse.each_with_index { |v, i| lv += v.unpack('C')[0] * 256**i }
-
-        ret = +''
-        while lv.positive?
-          lv, mod = lv.divmod(base)
-          ret << alphabet[mod]
-        end
-
-        npad = str.match(/^#{0.chr}*/)[0].to_s.size
-        '1' * npad + ret.reverse
-      end
-
       def address_for(network)
         version = PROTOCOL_VERSIONS.fetch(network)
         packed = version.chr + Faker::Config.random.bytes(20)
         checksum = Digest::SHA2.digest(Digest::SHA2.digest(packed))[0..3]
-        base58(packed + checksum)
+        Faker::Base58.encode(packed + checksum)
       end
     end
   end

lib/faker/tezos.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require 'digest'
+require 'securerandom'
+
+module Faker
+  class Tezos < Base
+    class << self
+      PREFIXES = {
+        tz1:    [6, 161, 159],
+        KT1:    [2, 90, 121],
+        edpk:   [13, 15, 37, 217],
+        edsk:  [13, 15, 58, 7],
+        edsig:  [9, 245, 205, 134, 18],
+        o:      [5, 116]
+      }.freeze
+
+      def account
+        encode_tz(:tz1, 20)
+      end
+
+      def contract
+        encode_tz(:KT1, 20)
+      end
+
+      def operation
+        encode_tz(:o, 32)
+      end
+
+      def signature
+        encode_tz(:edsig, 64)
+      end
+
+      protected
+
+      def encode_tz(prefix, payload_size)
+        prefix = PREFIXES.fetch(prefix)
+        packed = prefix.map(&:chr).join('') + Faker::Config.random.bytes(payload_size)
+        checksum = Digest::SHA2.digest(Digest::SHA2.digest(packed))[0..3]
+        Faker::Base58.encode(packed + checksum)
+      end
+    end
+  end
+end

lib/helpers/base58.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Faker
+  module Base58
+    def self.encode(str)
+      alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
+      base = alphabet.size
+
+      lv = 0
+      str.split('').reverse.each_with_index { |v, i| lv += v.unpack('C')[0] * 256**i }
+
+      ret = +''
+      while lv.positive?
+        lv, mod = lv.divmod(base)
+        ret << alphabet[mod]
+      end
+
+      npad = str.match(/^#{0.chr}*/)[0].to_s.size
+      '1' * npad + ret.reverse
+    end
+  end
+end

test/test_determinism.rb

@@ -45,7 +45,7 @@ def all_methods
 
   def subclasses
     Faker.constants.delete_if do |subclass|
-      %i[Base Bank Char ChileRut Config Date Internet Time VERSION].include?(subclass)
+      %i[Base Bank Char Base58 ChileRut Config Date Internet Time VERSION].include?(subclass)
     end.sort
   end
 

test/test_faker_tezos.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+require_relative 'test_helper'
+
+class TestFakerTezos < Test::Unit::TestCase
+  def test_contract
+    assert Faker::Tezos.contract.match(/^KT1[1-9A-Za-z][^OIl]{20,40}/)
+  end
+
+  def test_account
+    assert Faker::Tezos.account.match(/^tz1[1-9A-Za-z][^OIl]{20,40}/)
+  end
+
+  def test_operation
+    assert Faker::Tezos.operation.match(/^o[1-9A-Za-z][^OIl]{20,40}/)
+  end
+
+  def test_signature
+    assert Faker::Tezos.signature.match(/^edsig[1-9A-Za-z][^OIl]{20,40}/)
+  end
+
+  def test_deterministic_contract
+    Faker::Config.random = Random.new(42)
+    v = Faker::Tezos.contract
+    Faker::Config.random = Random.new(42)
+    assert v == Faker::Tezos.contract
+  end
+end