feat: add v3/v4 generators (thanks @slt)

README.md

@@ -3,3 +3,69 @@
 ![Build status](https://github.com/pact-foundation/pact-support/workflows/Test/badge.svg)
 
 Provides shared code for the Pact gems
+
+## Compatibility
+
+<details><summary>Specification Compatibility</summary>
+
+| Version  | Stable | [Spec] Compatibility | 
+| -------  | ------ | -------------------- |
+| 1.x.x    | Yes    | 2, 3\*               |
+
+_\*_ v3 support is limited to the subset of functionality required to enable language inter-operable [Message support].
+
+- See V3 tracking [issue](https://github.com/pact-foundation/pact-ruby/issues/318).
+- See V4 tracking [issue](https://github.com/pact-foundation/pact-ruby/issues/319).
+
+Want V3/V4 support now? See the new standalone [pact-verifier](https://github.com/pact-foundation/pact-reference/tree/master/rust/pact_verifier_cli#standalone-pact-verifier)
+
+[message support]: https://github.com/pact-foundation/pact-specification/tree/version-3#introduces-messages-for-services-that-communicate-via-event-streams-and-message-queues
+
+</details>
+
+### Supported matching rules
+
+| matcher       | Spec Version | Implemented | Usage|
+|---------------|--------------|-------------|-------------|
+| Equality      | V1           |   |    |
+| Regex         | V2           | ✅  | `Pact.term(generate, matcher)` |
+| Type          | V2           | ✅  | `Pact.like(generate)` |
+| MinType       | V2           | ✅  | `Pact.each_like(generate, min: <val>)` |
+| MaxType       | V2           |   |    |
+| MinMaxType    | V2           |   |    |
+| Include       | V3           |   |    |
+| Integer       | V3           |   |    |
+| Decimal       | V3           |   |    |
+| Number        | V3           |   |    |
+| Timestamp     | V3           |   |    |
+| Time          | V3           |   |    |
+| Date          | V3           |   |    |
+| Null          | V3           |   |    |
+| Boolean       | V3           |   |    |
+| ContentType   | V3           |   |    |
+| Values        | V3           |   |    |
+| ArrayContains | V4           |   |    |
+| StatusCode    | V4           |   |    |
+| NotEmpty      | V4           |   |    |
+| Semver        | V4           |   |    |
+| EachKey       | V4           |   |    |
+| EachValue     | V4           |   |    |
+
+### Supported generators
+
+Currently limited to provider verification only. No current way to set in consumer tests.
+
+| Generator                | Spec Version | Implemented |
+|------------------------|--------------|----|
+| RandomInt              | V3           | ✅ |
+| RandomDecimal          | V3           | ✅ |
+| RandomHexadecimal      | V3           | ✅ |
+| RandomString           | V3           | ✅ |
+| Regex                  | V3           | ✅ |
+| Uuid                   | V3/V4        | ✅ |
+| Date                   | V3           | ✅ |
+| Time                   | V3           | ✅ |
+| DateTime               | V3           | ✅ |
+| RandomBoolean          | V3           | ✅ |
+| ProviderState          | V4           | ✅ |
+| MockServerURL          | V4           | 🚧 |

lib/pact/generator/date.rb

@@ -0,0 +1,62 @@
+require 'date'
+
+module Pact
+  module Generator
+    # Date provides the time generator which will give the current date in the defined format
+    class Date
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == type
+      end
+
+      def call(hash, _params = nil, _example_value = nil)
+        format = hash['format'] || default_format
+        ::Time.now.strftime(convert_from_java_simple_date_format(format))
+      end
+
+      def type
+        'Date'
+      end
+
+      def default_format
+        'yyyy-MM-dd'
+      end
+
+      # Format for the pact specficiation should be the Java DateTimeFormmater
+      # This tries to convert to something Ruby can format.
+      def convert_from_java_simple_date_format(format)
+        # Year
+        format.sub!(/(?<!%)y{4,}/, '%Y')
+        format.sub!(/(?<!%)y{1,}/, '%y')
+
+        # Month
+        format.sub!(/(?<!%)M{4,}/, '%B')
+        format.sub!(/(?<!%)M{3}/, '%b')
+        format.sub!(/(?<!%)M{1,2}/, '%m')
+
+        # Week
+        format.sub!(/(?<!%)M{1,}/, '%W')
+
+        # Day
+        format.sub!(/(?<!%)D{1,}/, '%j')
+        format.sub!(/(?<!%)d{1,}/, '%d')
+        format.sub!(/(?<!%)E{4,}/, '%A')
+        format.sub!(/(?<!%)D{1,}/, '%a')
+        format.sub!(/(?<!%)u{1,}/, '%u')
+
+        # Time
+        format.sub!(/(?<!%)a{1,}/, '%p')
+        format.sub!(/(?<!%)k{1,}/, '%H')
+        format.sub!(/(?<!%)n{1,}/, '%M')
+        format.sub!(/(?<!%)s{1,}/, '%S')
+        format.sub!(/(?<!%)S{1,}/, '%L')
+
+        # Timezone
+        format.sub!(/(?<!%)z{1,}/, '%z')
+        format.sub!(/(?<!%)Z{1,}/, '%z')
+        format.sub!(/(?<!%)X{1,}/, '%Z')
+
+        format
+      end
+    end
+  end
+end

lib/pact/generator/datetime.rb

@@ -0,0 +1,16 @@
+require 'date'
+
+module Pact
+  module Generator
+    # DateTime provides the time generator which will give the current date time in the defined format
+    class DateTime < Date
+      def type
+        'DateTime'
+      end
+
+      def default_format
+        'yyyy-MM-dd HH:mm'
+      end
+    end
+  end
+end

lib/pact/generator/provider_state.rb

@@ -0,0 +1,53 @@
+require 'pact/logging'
+
+module Pact
+  module Generator
+    # ProviderState provides the provider state generator which will inject
+    # values provided by the provider state setup url.
+    class ProviderState
+      include Pact::Logging
+
+      # rewrite of https://github.com/DiUS/pact-jvm/blob/master/core/support/src/main/kotlin/au/com/dius/pact/core/support/expressions/ExpressionParser.kt#L27
+      VALUES_SEPARATOR = ','
+      START_EXPRESSION = "\${"
+      END_EXPRESSION = '}'
+
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'ProviderState'
+      end
+
+      def call(hash, params = nil, _example_value = nil)
+        params ||= {}
+        parse_expression hash['expression'], params
+      end
+
+      def parse_expression(expression, params)
+        return_string = []
+        buffer = expression
+        # initial value
+        position = buffer.index(START_EXPRESSION)
+
+        while position && position >= 0
+          if position.positive?
+            # add string
+            return_string.push(buffer[0...position])
+          end
+          end_position = buffer.index(END_EXPRESSION, position)
+          raise 'Missing closing brace in expression string' if !end_position || end_position.negative?
+
+          variable = buffer[position + 2...end_position]
+
+          logger.info "Could not subsitute provider state key #{variable}, have #{params}" unless params[variable]
+
+          expression = params[variable] || ''
+          return_string.push(expression)
+
+          buffer = buffer[end_position + 1...-1]
+          position = buffer.index(START_EXPRESSION)
+        end
+
+        return_string.join('')
+      end
+    end
+  end
+end

lib/pact/generator/random_boolean.rb

@@ -0,0 +1,14 @@
+module Pact
+  module Generator
+    # Boolean provides the boolean generator which will give a true or false value
+    class RandomBoolean
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'RandomBoolean'
+      end
+
+      def call(_hash, _params = nil, _example_value = nil)
+        [true, false].sample
+      end
+    end
+  end
+end

lib/pact/generator/random_decimal.rb

@@ -0,0 +1,37 @@
+require 'bigdecimal'
+
+module Pact
+  module Generator
+    # RandomDecimal provides the random decimal generator which will generate a decimal value of digits length
+    class RandomDecimal
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'RandomDecimal'
+      end
+
+      def call(hash, _params = nil, _example_value = nil)
+        digits = hash['digits'] || 6
+
+        raise 'RandomDecimalGenerator digits must be > 0, got $digits' if digits < 1
+
+        return rand(0..9) if digits == 1
+
+        return rand(0..9) + rand(1..9) / 10 if digits == 2
+
+        pos = rand(1..digits - 1)
+        precision = digits - pos
+        integers = ''
+        decimals = ''
+        while pos.positive?
+          integers += String(rand(1..9))
+          pos -= 1
+        end
+        while precision.positive?
+          decimals += String(rand(1..9))
+          precision -= 1
+        end
+
+        Float("#{integers}.#{decimals}")
+      end
+    end
+  end
+end

lib/pact/generator/random_hexadecimal.rb

@@ -0,0 +1,19 @@
+require 'securerandom'
+
+module Pact
+  module Generator
+    # RandomHexadecimal provides the random hexadecimal generator which will generate a hexadecimal
+    class RandomHexadecimal
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'RandomHexadecimal'
+      end
+
+      def call(hash, _params = nil, _example_value = nil)
+        digits = hash['digits'] || 8
+        bytes = (digits / 2).ceil
+        string = SecureRandom.hex(bytes)
+        string[0, digits]
+      end
+    end
+  end
+end

lib/pact/generator/random_int.rb

@@ -0,0 +1,16 @@
+module Pact
+  module Generator
+    # RandomInt provides the random int generator which generate a random integer, with a min/max
+    class RandomInt
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'RandomInt'
+      end
+
+      def call(hash, _params = nil, _example_value = nil)
+        min = hash['min'] || 0
+        max = hash['max'] || 2_147_483_647
+        rand(min..max)
+      end
+    end
+  end
+end

lib/pact/generator/random_string.rb

@@ -0,0 +1,16 @@
+module Pact
+  module Generator
+    # RandomString provides the random string generator which generate a random string of size length
+    class RandomString
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'RandomString'
+      end
+
+      def call(hash, _params = nil, _example_value = nil)
+        size = hash['size'] || 20
+        string = rand(36**(size + 2)).to_s(36)
+        string[0, size]
+      end
+    end
+  end
+end

lib/pact/generator/regex.rb

@@ -0,0 +1,17 @@
+require 'string_pattern'
+
+module Pact
+  module Generator
+    # Regex provides the regex generator which will generate a value based on the regex pattern provided
+    class Regex
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'Regex'
+      end
+
+      def call(hash, _params = nil, _example_value = nil)
+        pattern = hash['pattern'] || ''
+        StringPattern.generate(Regexp.new(pattern))
+      end
+    end
+  end
+end

lib/pact/generator/time.rb

@@ -0,0 +1,16 @@
+require 'date'
+
+module Pact
+  module Generator
+    # Time provides the time generator which will give the current time in the defined format
+    class Time < Date
+      def type
+        'Time'
+      end
+
+      def default_format
+        'HH:mm'
+      end
+    end
+  end
+end

lib/pact/generator/uuid.rb

@@ -0,0 +1,19 @@
+require 'securerandom'
+
+module Pact
+  module Generator
+    # Uuid provides the uuid generator
+    class Uuid
+      def can_generate?(hash)
+        hash.key?('type') && hash['type'] == 'Uuid'
+      end
+
+      # If we had the example value, we could determine what type of uuid
+      # to send, this is what pact-jvm does
+      # See https://github.com/pact-foundation/pact-jvm/blob/master/core/model/src/main/kotlin/au/com/dius/pact/core/model/generators/Generator.kt
+      def call(_hash, _params = nil, _example_value = nil)
+        SecureRandom.uuid
+      end
+    end
+  end
+end