Referencing request from response (#238)

The best situation is to provide fixed values but sometimes you need to reference a request in your response. In order to do this you can profit from the fromRequest() method that allows you to reference a bunch of elements from the HTTP request. You can use the following options:

- `fromRequest().url()` - return the request URL
- `fromRequest().query(String key)` - return the first query parameter with a given name
- `fromRequest().query(String key, int index)` - return the nth query parameter with a given name
- `fromRequest().header(String key)` - return the first header with a given name
- `fromRequest().header(String key, int index)` - return the nth header with a given name
- `fromRequest().body()` - return the full request body
- `fromRequest().body(String jsonPath)` - return the element from the request that matches the JSON Path

fixes #237

samples/standalone/dsl/http-server/src/test/java/com/example/fraud/FraudBase.java

@@ -5,7 +5,6 @@ import org.junit.Before;
 import com.jayway.restassured.module.mockmvc.RestAssuredMockMvc;
 
 public class FraudBase {
-
 	@Before
 	public void setup() {
 		RestAssuredMockMvc.standaloneSetup(new FraudDetectionController(),

samples/standalone/dsl/http-server/src/test/java/com/example/fraud/FraudnameBase.java

@@ -0,0 +1,17 @@
+package com.example.fraud;
+
+import org.junit.Before;
+
+import com.jayway.restassured.module.mockmvc.RestAssuredMockMvc;
+
+public class FraudnameBase {
+
+	private static final String FRAUD_NAME = "fraud";
+
+	FraudVerifier fraudVerifier = FRAUD_NAME::equals;
+
+	@Before
+	public void setup() {
+		RestAssuredMockMvc.standaloneSetup(new FraudNameController(this.fraudVerifier));
+	}
+}

samples/standalone/dsl/http-server/src/test/resources/contracts/fraudname/shouldReturnAFraudForTheName.groovy

@@ -0,0 +1,25 @@
+package contracts.fraudname
+
+org.springframework.cloud.contract.spec.Contract.make {
+	request {
+		// highest priority
+		priority(1)
+		method PUT()
+		url '/frauds/name'
+		body([
+			   name: "fraud"
+		])
+		headers {
+			contentType("application/vnd.fraud.v1+json")
+		}
+	}
+	response {
+		status 200
+		body([
+				result: "Sorry ${fromRequest().body('$.name')} but you're a fraud"
+		])
+		headers {
+			header(contentType(), "${fromRequest().header(contentType())};charset=UTF-8")
+		}
+	}
+}

samples/standalone/dsl/http-server/src/test/resources/contracts/fraudname/shouldReturnNonFraudForTheName.groovy

@@ -0,0 +1,23 @@
+package contracts.fraudname
+
+org.springframework.cloud.contract.spec.Contract.make {
+	request {
+		method PUT()
+		url '/frauds/name'
+		body([
+			   name: $(anyAlphaUnicode())
+		])
+		headers {
+			contentType("application/vnd.fraud.v1+json")
+		}
+	}
+	response {
+		status 200
+		body([
+				result: "Don't worry ${fromRequest().body('$.name')} you're not a fraud"
+		])
+		headers {
+			header(contentType(), "${fromRequest().header(contentType())};charset=UTF-8")
+		}
+	}
+}