Add support for documenting request and response cookies

See gh-592

config/checkstyle/checkstyle.xml

@@ -5,7 +5,8 @@
 		<property name="file" value="${config_loc}/checkstyle-suppressions.xml"/>
 	</module>
 	<module name="io.spring.javaformat.checkstyle.SpringChecks">
-		<property name="avoidStaticImportExcludes" value=" org.springframework.restdocs.cli.CliDocumentation.*"/>
+		<property name="avoidStaticImportExcludes" value="org.springframework.restdocs.cli.CliDocumentation.*,
+				org.springframework.restdocs.cookies.CookieDocumentation.*"/>
 	</module>
 	<module name="com.puppycrawl.tools.checkstyle.TreeWalker">
 		<module name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">

docs/build.gradle

@@ -21,6 +21,7 @@ dependencies {
 	testImplementation(project(":spring-restdocs-mockmvc"))
 	testImplementation(project(":spring-restdocs-restassured"))
 	testImplementation(project(":spring-restdocs-webtestclient"))
+	testImplementation("jakarta.servlet:jakarta.servlet-api")
 	testImplementation("jakarta.validation:jakarta.validation-api")
 	testImplementation("junit:junit")
 	testImplementation("org.testng:testng:6.9.10")

docs/src/docs/asciidoc/documenting-your-api.adoc

@@ -988,6 +988,61 @@ Each contains a table describing the headers.
 When documenting HTTP Headers, the test fails if a documented header is not found in the request or response.
 
 
+[[documenting-your-api-http-cookies]]
+=== HTTP Cookies
+
+You can document the cookies in a request or response by using `requestCookies` and
+`responseCookies`, respectively. The following examples show how to do so:
+
+====
+[source,java,indent=0,role="primary"]
+.MockMvc
+----
+include::{examples-dir}/com/example/mockmvc/HttpCookies.java[tags=cookies]
+----
+<1> Configure Spring REST Docs to produce a snippet describing the request's cookies.
+	Uses the static `requestCookies` method on
+	`org.springframework.restdocs.cookies.CookieDocumentation`.
+<2> Document the `JSESSIONID` cookie. Uses the static `cookieWithName` method on
+	`org.springframework.restdocs.cookies.CookieDocumentation.
+<3> Produce a snippet describing the response's cookies. Uses the static `responseCookies`
+	method on `org.springframework.restdocs.cookies.CookieDocumentation`.
+<4> Configure the request with an `JSESSIONID` and an additional cookie `logged_in`.
+
+[source,java,indent=0,role="secondary"]
+.WebTestClient
+----
+include::{examples-dir}/com/example/webtestclient/HttpCookies.java[tags=cookies]
+----
+<1> Configure Spring REST Docs to produce a snippet describing the request's cookies.
+	Uses the static `requestCookies` method on
+	`org.springframework.restdocs.cookies.CookieDocumentation`.
+<2> Document the `JSESSIONID` cookie. Uses the static `cookieWithName` method on
+	`org.springframework.restdocs.cookies.CookieDocumentation.
+<3> Produce a snippet describing the response's cookies. Uses the static `responseCookies`
+	method on `org.springframework.restdocs.cookies.CookieDocumentation`.
+<4> Configure the request with an `JSESSIONID` and an additional cookie `logged_in`.
+
+[source,java,indent=0,role="secondary"]
+.REST Assured
+----
+include::{examples-dir}/com/example/restassured/HttpCookies.java[tags=cookies]
+----
+<1> Configure Spring REST Docs to produce a snippet describing the request's cookies.
+	Uses the static `requestCookies` method on
+	`org.springframework.restdocs.cookies.CookieDocumentation`.
+<2> Document the `JSESSIONID` cookie. Uses the static `cookieWithName` method on
+	`org.springframework.restdocs.cookies.CookieDocumentation.
+<3> Produce a snippet describing the response's cookies. Uses the static `responseCookies`
+	method on `org.springframework.restdocs.cookies.CookieDocumentation`.
+<4> Configure the request with an `JSESSIONID` and an additional cookie `logged_in`.
+====
+
+The result is a snippet named `request-cookies.adoc` and a snippet named
+`response-cookies.adoc`. Each contains a table describing the cookies.
+
+When documenting HTTP Cookies, the test fails if a documented cookie is not found in
+the request or response.
 
 [[documenting-your-api-reusing-snippets]]
 === Reusing Snippets

docs/src/test/java/com/example/mockmvc/HttpCookies.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2014-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.mockmvc;
+
+import jakarta.servlet.http.Cookie;
+
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.springframework.restdocs.cookies.CookieDocumentation.cookieWithName;
+import static org.springframework.restdocs.cookies.CookieDocumentation.requestCookies;
+import static org.springframework.restdocs.cookies.CookieDocumentation.responseCookies;
+import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.document;
+import static org.springframework.restdocs.mockmvc.RestDocumentationRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+public class HttpCookies {
+
+	private MockMvc mockMvc;
+
+	public void cookies() throws Exception {
+		// tag::cookies[]
+		this.mockMvc.perform(get("/").cookie(new Cookie("JSESSIONID", "ACBCDFD0FF93D5BB"))) // <1>
+				.andExpect(status().isOk()).andDo(document("cookies", requestCookies(// <2>
+						cookieWithName("JSESSIONID").description("Session token")), // <3>
+						responseCookies(// <4>
+								cookieWithName("JSESSIONID").description("Updated session token"),
+								cookieWithName("logged_in")
+										.description("Set to true if the user is currently logged in"))));
+		// end::cookies[]
+	}
+
+}

docs/src/test/java/com/example/restassured/HttpCookies.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2014-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.restassured;
+
+import io.restassured.RestAssured;
+import io.restassured.specification.RequestSpecification;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.springframework.restdocs.cookies.CookieDocumentation.cookieWithName;
+import static org.springframework.restdocs.cookies.CookieDocumentation.requestCookies;
+import static org.springframework.restdocs.cookies.CookieDocumentation.responseCookies;
+import static org.springframework.restdocs.restassured.RestAssuredRestDocumentation.document;
+
+public class HttpCookies {
+
+	private RequestSpecification spec;
+
+	public void cookies() throws Exception {
+		// tag::cookies[]
+		RestAssured.given(this.spec).filter(document("cookies", requestCookies(// <1>
+				cookieWithName("JSESSIONID").description("Saved session token")), // <2>
+				responseCookies(// <3>
+						cookieWithName("logged_in").description("If user is logged in"),
+						cookieWithName("JSESSIONID").description("Updated session token"))))
+				.cookie("JSESSIONID", "ACBCDFD0FF93D5BB") // <4>
+				.when().get("/people").then().assertThat().statusCode(is(200));
+		// end::cookies[]
+	}
+
+}

docs/src/test/java/com/example/webtestclient/HttpCookies.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2014-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.webtestclient;
+
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import static org.springframework.restdocs.cookies.CookieDocumentation.cookieWithName;
+import static org.springframework.restdocs.cookies.CookieDocumentation.requestCookies;
+import static org.springframework.restdocs.cookies.CookieDocumentation.responseCookies;
+import static org.springframework.restdocs.webtestclient.WebTestClientRestDocumentation.document;
+
+public class HttpCookies {
+
+	// @formatter:off
+
+	private WebTestClient webTestClient;
+
+	public void cookies() throws Exception {
+		// tag::cookies[]
+		this.webTestClient
+			.get().uri("/people").cookie("JSESSIONID", "ACBCDFD0FF93D5BB=") // <1>
+			.exchange().expectStatus().isOk().expectBody()
+			.consumeWith(document("cookies",
+				requestCookies(// <2>
+					cookieWithName("JSESSIONID").description("Session token")), // <3>
+				responseCookies(// <4>
+					cookieWithName("JSESSIONID")
+						.description("Updated session token"),
+					cookieWithName("logged_in")
+						.description("User is logged in"))));
+		// end::cookies[]
+	}
+}

spring-restdocs-core/src/main/java/org/springframework/restdocs/cookies/AbstractCookiesSnippet.java

@@ -0,0 +1,145 @@
+/*
+ * Copyright 2014-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.restdocs.cookies;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.springframework.restdocs.operation.Operation;
+import org.springframework.restdocs.snippet.SnippetException;
+import org.springframework.restdocs.snippet.TemplatedSnippet;
+import org.springframework.util.Assert;
+
+/**
+ * Abstract {@link TemplatedSnippet} subclass that provides a base for snippets that
+ * document a RESTful resource's request or response cookies.
+ *
+ * @author Andreas Evers
+ * @author Clyde Stubbs
+ * @since 2.1
+ */
+public abstract class AbstractCookiesSnippet extends TemplatedSnippet {
+
+	private List<CookieDescriptor> cookieDescriptors;
+
+	protected final boolean ignoreUndocumentedCookies;
+
+	private String type;
+
+	/**
+	 * Creates a new {@code AbstractCookiesSnippet} that will produce a snippet named
+	 * {@code <type>-cookies}. The cookies will be documented using the given
+	 * {@code  descriptors} and the given {@code attributes} will be included in the model
+	 * during template rendering.
+	 * @param type the type of the cookies
+	 * @param descriptors the cookie descriptors
+	 * @param attributes the additional attributes
+	 * @param ignoreUndocumentedCookies whether undocumented cookies should be ignored
+	 */
+	protected AbstractCookiesSnippet(String type, List<CookieDescriptor> descriptors, Map<String, Object> attributes,
+			boolean ignoreUndocumentedCookies) {
+		super(type + "-cookies", attributes);
+		for (CookieDescriptor descriptor : descriptors) {
+			Assert.notNull(descriptor.getName(), "The name of the cookie must not be null");
+			if (!descriptor.isIgnored()) {
+				Assert.notNull(descriptor.getDescription(), "The description of the cookie must not be null");
+			}
+		}
+		this.cookieDescriptors = descriptors;
+		this.type = type;
+		this.ignoreUndocumentedCookies = ignoreUndocumentedCookies;
+	}
+
+	@Override
+	protected Map<String, Object> createModel(Operation operation) {
+		validateCookieDocumentation(operation);
+
+		Map<String, Object> model = new HashMap<>();
+		List<Map<String, Object>> cookies = new ArrayList<>();
+		model.put("cookies", cookies);
+		for (CookieDescriptor descriptor : this.cookieDescriptors) {
+			cookies.add(createModelForDescriptor(descriptor));
+		}
+		return model;
+	}
+
+	private void validateCookieDocumentation(Operation operation) {
+		List<CookieDescriptor> missingCookies = findMissingCookies(operation);
+		if (!missingCookies.isEmpty()) {
+			List<String> names = new ArrayList<>();
+			for (CookieDescriptor cookieDescriptor : missingCookies) {
+				names.add(cookieDescriptor.getName());
+			}
+			throw new SnippetException(
+					"Cookies with the following names were not found" + " in the " + this.type + ": " + names);
+		}
+	}
+
+	/**
+	 * Finds the cookies that are missing from the operation. A cookie is missing if it is
+	 * described by one of the {@code cookieDescriptors} but is not present in the
+	 * operation.
+	 * @param operation the operation
+	 * @return descriptors for the cookies that are missing from the operation
+	 */
+	protected List<CookieDescriptor> findMissingCookies(Operation operation) {
+		List<CookieDescriptor> missingCookies = new ArrayList<>();
+		Set<String> actualCookies = extractActualCookies(operation);
+		for (CookieDescriptor cookieDescriptor : this.cookieDescriptors) {
+			if (!cookieDescriptor.isOptional() && !actualCookies.contains(cookieDescriptor.getName())) {
+				missingCookies.add(cookieDescriptor);
+			}
+		}
+
+		return missingCookies;
+	}
+
+	/**
+	 * Extracts the names of the cookies from the request or response of the given
+	 * {@code operation}.
+	 * @param operation the operation
+	 * @return the cookie names
+	 */
+	protected abstract Set<String> extractActualCookies(Operation operation);
+
+	/**
+	 * Returns the list of {@link CookieDescriptor CookieDescriptors} that will be used to
+	 * generate the documentation.
+	 * @return the cookie descriptors
+	 */
+	protected final List<CookieDescriptor> getCookieDescriptors() {
+		return this.cookieDescriptors;
+	}
+
+	/**
+	 * Returns a model for the given {@code descriptor}.
+	 * @param descriptor the descriptor
+	 * @return the model
+	 */
+	protected Map<String, Object> createModelForDescriptor(CookieDescriptor descriptor) {
+		Map<String, Object> model = new HashMap<>();
+		model.put("name", descriptor.getName());
+		model.put("description", descriptor.getDescription());
+		model.put("optional", descriptor.isOptional());
+		model.putAll(descriptor.getAttributes());
+		return model;
+	}
+
+}