fix: allow pact broker template parameter in URL

lib/pact_broker/api/contracts/webhook_contract.rb

@@ -70,7 +70,7 @@ def valid_method?(http_method)
               end
 
               def valid_url?(url)
-                uri = URI(url)
+                uri = parse_uri(url)
                 uri.scheme && uri.host
               rescue URI::InvalidURIError
                 false
@@ -83,15 +83,15 @@ def allowed_webhook_method?(http_method)
               end
 
               def allowed_webhook_scheme?(url)
-                scheme = URI(url).scheme
+                scheme = parse_uri(url).scheme
                 PactBroker.configuration.webhook_scheme_whitelist.any? do | allowed_scheme |
                   scheme.downcase == allowed_scheme.downcase
                 end
               end
 
               def allowed_webhook_host?(url)
                 if host_whitelist.any?
-                  PactBroker::Webhooks::CheckHostWhitelist.call(URI(url).host, host_whitelist).any?
+                  PactBroker::Webhooks::CheckHostWhitelist.call(parse_uri(url).host, host_whitelist).any?
                 else
                   true
                 end
@@ -100,6 +100,10 @@ def allowed_webhook_host?(url)
               def host_whitelist
                 PactBroker.configuration.webhook_host_whitelist
               end
+
+              def parse_uri(uri_string)
+                URI(uri_string.gsub(/\$\{pactbroker\.[^\}]+\}/, 'placeholder'))
+              end
             end
 
             required(:http_method).filled(:valid_method?, :allowed_webhook_method?)

spec/lib/pact_broker/api/contracts/webhook_contract_spec.rb

@@ -179,8 +179,19 @@ def valid_webhook_with
               expect(subject.errors[:"request.url"]).to eq ["is not a valid URL eg. http://example.org"]
             end
           end
-        end
 
+          context "with a URL that has templated parameters in it" do
+            let(:json) do
+              valid_webhook_with do |hash|
+                hash['request']['url'] = 'https://foo/commits/${pactbroker.consumerVersionNumber}'
+              end
+            end
+
+            it "is empty" do
+              expect(subject.errors).to be_empty
+            end
+          end
+        end
       end
     end
   end