feat: add endpoint to retrieve a pact version by its pact content sha

lib/pact_broker/api.rb

@@ -13,6 +13,7 @@ module PactBroker
 
         # Pacts
         add ['pacts', 'provider', :provider_name, 'consumer', :consumer_name, 'version', :consumer_version_number], Api::Resources::Pact, {resource_name: "pact_publication"}
+        add ['pacts', 'provider', :provider_name, 'consumer', :consumer_name, 'pact-version', :pact_version_sha], Api::Resources::PactVersion, {resource_name: "pact_publication"}
         add ['pacts', 'provider', :provider_name, 'consumer', :consumer_name, 'version', :consumer_version_number, 'previous-distinct'], Api::Resources::PreviousDistinctPactVersion, {resource_name: "previous_distinct_pact_version"}
         add ['pacts', 'provider', :provider_name, 'consumer', :consumer_name, 'version', :consumer_version_number, 'diff', 'previous-distinct'], Api::Resources::PactContentDiff, {resource_name: "previous_distinct_pact_version_diff"}
 

lib/pact_broker/api/resources/pact_version.rb

@@ -0,0 +1,13 @@
+require 'pact_broker/api/resources/pact'
+
+module PactBroker
+  module Api
+    module Resources
+      class PactVersion < Pact
+        def allowed_methods
+          ["GET"]
+        end
+      end
+    end
+  end
+end

spec/features/get_pact_version.rb

@@ -0,0 +1,13 @@
+describe "retrieving a pact" do
+  subject { get path; last_response  }
+
+  context "when differing case is used in the consumer and provider names" do
+    let(:td) { TestDataBuilder.new }
+    let(:pact) { td.create_pact_with_hierarchy("Foo", "1", "Bar").and_return(:pact) }
+    let!(:path) { "/pacts/provider/Bar/consumer/Foo/pact-version/#{pact.pact_version_sha}" }
+
+    it "returns a 200 Success" do
+      expect(subject.status).to be 200
+    end
+  end
+end