Add Blockchain namespace (faker-ruby#1481)

* Deprecate ::Bitcoin

* Deprecate ::Ethereum

* Deprecate ::Tezos

* Update unreleased_README.md

* Minor fixes

lib/faker/blockchain/bitcoin.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require 'digest'
+require 'securerandom'
+
+module Faker
+  class Blockchain
+    class Bitcoin < Base
+      class << self
+        PROTOCOL_VERSIONS = {
+          main: 0,
+          testnet: 111
+        }.freeze
+
+        def address
+          address_for(:main)
+        end
+
+        def testnet_address
+          address_for(:testnet)
+        end
+
+        protected
+
+        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]
+          Faker::Base58.encode(packed + checksum)
+        end
+      end
+    end
+  end
+end

lib/faker/blockchain/ethereum.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module Faker
+  class Blockchain
+    class Ethereum < Base
+      class << self
+        def address
+          hex_alphabet = '0123456789abcdef'
+          var = +'0x'
+          40.times { var << sample(shuffle(hex_alphabet.split(''))) }
+          var
+        end
+      end
+    end
+  end
+end

lib/faker/blockchain/tezos.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'digest'
+require 'securerandom'
+
+module Faker
+  class Blockchain
+    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
+end

lib/faker/deprecate/bitcoin.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Faker
+  class Bitcoin < Base
+    class << self
+      extend Gem::Deprecate
+
+      def address
+        Faker::Blockchain::Bitcoin.address
+      end
+
+      def testnet_address
+        Faker::Blockchain::Bitcoin.testnet_address
+      end
+
+      deprecate :address, 'Faker::Blockchain::Bitcoin.address', 2018, 12
+      deprecate :testnet_address, 'Faker::Blockchain::Bitcoin.testnet_address', 2018, 12
+    end
+  end
+end

lib/faker/deprecate/ethereum.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Faker
+  class Ethereum < Base
+    class << self
+      extend Gem::Deprecate
+
+      def address
+        Faker::Blockchain::Ethereum.address
+      end
+
+      deprecate :address, 'Faker::Blockchain::Tezos.address', 2018, 12
+    end
+  end
+end

lib/faker/deprecate/tezos.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'digest'
+require 'securerandom'
+
+module Faker
+  class Tezos < Base
+    class << self
+      extend Gem::Deprecate
+
+      def account
+        Faker::Blockchain::Tezos.account
+      end
+
+      def contract
+        Faker::Blockchain::Tezos.contract
+      end
+
+      def operation
+        Faker::Blockchain::Tezos.operation
+      end
+
+      def signature
+        Faker::Blockchain::Tezos.signature
+      end
+
+      deprecate :account, 'Faker::Blockchain::Tezos.account', 2018, 12
+      deprecate :contract, 'Faker::Blockchain::Tezos.contract', 2018, 12
+      deprecate :operation, 'Faker::Blockchain::Tezos.operation', 2018, 12
+      deprecate :signature, 'Faker::Blockchain::Tezos.signature', 2018, 12
+    end
+  end
+end

test/faker/default/test_faker_bitcoin.rb → test/deprecate/test_deprecate_bitcoin.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
-require_relative '../../test_helper'
+require_relative '../test_helper'
 
-class TestFakerBitcoin < Test::Unit::TestCase
+class TestDeprecateBitcoin < Test::Unit::TestCase
   def test_address
     assert Faker::Bitcoin.address.match(/^[13][1-9A-Za-z][^OIl]{20,40}/)
   end

test/deprecate/test_deprecate_ethereum.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+
+class TestDeprecateEthereum < Test::Unit::TestCase
+  def setup
+    @tester = Faker::Ethereum
+  end
+
+  def test_address
+    assert @tester.address.match(/0x([a-fA-F0-9]{40})/)
+  end
+end

test/faker/default/test_faker_tezos.rb → test/deprecate/test_deprecate_tezos.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
-require_relative '../../test_helper'
+require_relative '../test_helper'
 
-class TestFakerTezos < Test::Unit::TestCase
+class TestDeprecateTezos < Test::Unit::TestCase
   def test_contract
     assert Faker::Tezos.contract.match(/^KT1[1-9A-Za-z][^OIl]{20,40}/)
   end

test/faker/blockchain/bitcoin.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require_relative '../../test_helper'
+
+class TestFakerBitcoin < Test::Unit::TestCase
+  def test_address
+    assert Faker::Blockchain::Bitcoin.address.match(/^[13][1-9A-Za-z][^OIl]{20,40}/)
+  end
+
+  def test_deterministic_address
+    Faker::Config.random = Random.new(42)
+    v = Faker::Blockchain::Bitcoin.address
+    Faker::Config.random = Random.new(42)
+    assert v == Faker::Blockchain::Bitcoin.address
+  end
+
+  def test_testnet_address
+    assert_match(/\A[mn][1-9A-Za-z]{32,34}\Z/, Faker::Blockchain::Bitcoin.testnet_address)
+    assert_not_match(/[OIl]/, Faker::Blockchain::Bitcoin.testnet_address)
+  end
+end

test/faker/default/test_faker_ethereum.rb → test/faker/blockchain/ethereum.rb

@@ -4,7 +4,7 @@
 
 class TestFakerEthereum < Test::Unit::TestCase
   def setup
-    @tester = Faker::Ethereum
+    @tester = Faker::Blockchain::Ethereum
   end
 
   def test_address

test/faker/blockchain/tezos.rb

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