Polishing in CookieWebSessionIdResolver

See gh-31214

spring-web/src/main/java/org/springframework/web/server/session/CookieWebSessionIdResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -42,11 +42,11 @@ public class CookieWebSessionIdResolver implements WebSessionIdResolver {
 	private Duration cookieMaxAge = Duration.ofSeconds(-1);
 
 	@Nullable
-	private Consumer<ResponseCookie.ResponseCookieBuilder> cookieInitializer = null;
+	private Consumer<ResponseCookie.ResponseCookieBuilder> initializer = null;
 
 
 	/**
-	 * Set the name of the cookie to use for the session ID.
+	 * Set the name for the session id cookie.
 	 * <p>By default set to "SESSION".
 	 * @param cookieName the cookie name
 	 */
@@ -63,32 +63,32 @@ public class CookieWebSessionIdResolver implements WebSessionIdResolver {
 	}
 
 	/**
-	 * Set the value for the "Max-Age" attribute of the cookie that holds the
-	 * session ID.
-	 * <p>For the range of values see {@link ResponseCookie#getMaxAge()}.
-	 * <p>By default set to -1.
+	 * Set the "Max-Age" attribute for the session id cookie.
+	 * <p>By default set to -1 in which case the cookie is removed when the
+	 * browser is closed.
 	 * @param maxAge the maxAge duration value
+	 * @see ResponseCookie#getMaxAge()
 	 */
 	public void setCookieMaxAge(Duration maxAge) {
 		this.cookieMaxAge = maxAge;
 	}
 
 	/**
-	 * Get the configured "Max-Age" attribute value for the session cookie.
+	 * Get the configured "Max-Age" for the session id cookie.
 	 */
 	public Duration getCookieMaxAge() {
 		return this.cookieMaxAge;
 	}
 
 	/**
-	 * Add a {@link Consumer} for a {@code ResponseCookieBuilder} that will be invoked
-	 * for each cookie being built, just before the call to {@code build()}.
-	 * @param initializer consumer for a cookie builder
+	 * Add a {@link Consumer} to further initialize the session id cookie
+	 * after {@link #getCookieName()} and {@link #getCookieMaxAge()} are applied.
+	 * @param initializer consumer to initialize the cookie with
 	 * @since 5.1
 	 */
 	public void addCookieInitializer(Consumer<ResponseCookie.ResponseCookieBuilder> initializer) {
-		this.cookieInitializer = this.cookieInitializer != null ?
-				this.cookieInitializer.andThen(initializer) : initializer;
+		this.initializer = this.initializer != null ?
+				this.initializer.andThen(initializer) : initializer;
 	}
 
 
@@ -115,21 +115,19 @@ public class CookieWebSessionIdResolver implements WebSessionIdResolver {
 		exchange.getResponse().getCookies().set(this.cookieName, cookie);
 	}
 
-	private ResponseCookie initSessionCookie(
-			ServerWebExchange exchange, String id, Duration maxAge) {
-
-		ResponseCookie.ResponseCookieBuilder cookieBuilder = ResponseCookie.from(this.cookieName, id)
+	private ResponseCookie initSessionCookie(ServerWebExchange exchange, String id, Duration maxAge) {
+		ResponseCookie.ResponseCookieBuilder builder = ResponseCookie.from(this.cookieName, id)
 				.path(exchange.getRequest().getPath().contextPath().value() + "/")
 				.maxAge(maxAge)
 				.httpOnly(true)
 				.secure("https".equalsIgnoreCase(exchange.getRequest().getURI().getScheme()))
 				.sameSite("Lax");
 
-		if (this.cookieInitializer != null) {
-			this.cookieInitializer.accept(cookieBuilder);
+		if (this.initializer != null) {
+			this.initializer.accept(builder);
 		}
 
-		return cookieBuilder.build();
+		return builder.build();
 	}
 
 }

spring-web/src/test/java/org/springframework/web/server/session/CookieWebSessionIdResolverTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -20,6 +20,7 @@ import org.junit.jupiter.api.Test;
 
 import org.springframework.http.ResponseCookie;
 import org.springframework.util.MultiValueMap;
+import org.springframework.web.server.ServerWebExchange;
 import org.springframework.web.testfixture.http.server.reactive.MockServerHttpRequest;
 import org.springframework.web.testfixture.server.MockServerWebExchange;
 
@@ -33,18 +34,14 @@ public class CookieWebSessionIdResolverTests {
 
 	private final CookieWebSessionIdResolver resolver = new CookieWebSessionIdResolver();
 
+	private final ServerWebExchange exchange =
+			MockServerWebExchange.from(MockServerHttpRequest.get("https://example.org/path"));
+
 
 	@Test
 	public void setSessionId() {
-		MockServerHttpRequest request = MockServerHttpRequest.get("https://example.org/path").build();
-		MockServerWebExchange exchange = MockServerWebExchange.from(request);
-		this.resolver.setSessionId(exchange, "123");
-
-		MultiValueMap<String, ResponseCookie> cookies = exchange.getResponse().getCookies();
-		assertThat(cookies).hasSize(1);
-		ResponseCookie cookie = cookies.getFirst(this.resolver.getCookieName());
-		assertThat(cookie).isNotNull();
-		assertThat(cookie.toString()).isEqualTo("SESSION=123; Path=/; Secure; HttpOnly; SameSite=Lax");
+		this.resolver.setSessionId(this.exchange, "123");
+		assertCookieValue("SESSION=123; Path=/; Secure; HttpOnly; SameSite=Lax");
 	}
 
 	@Test
@@ -52,16 +49,17 @@ public class CookieWebSessionIdResolverTests {
 		this.resolver.addCookieInitializer(builder -> builder.domain("example.org"));
 		this.resolver.addCookieInitializer(builder -> builder.sameSite("Strict"));
 		this.resolver.addCookieInitializer(builder -> builder.secure(false));
+		this.resolver.setSessionId(this.exchange, "123");
 
-		MockServerHttpRequest request = MockServerHttpRequest.get("https://example.org/path").build();
-		MockServerWebExchange exchange = MockServerWebExchange.from(request);
-		this.resolver.setSessionId(exchange, "123");
+		assertCookieValue("SESSION=123; Path=/; Domain=example.org; HttpOnly; SameSite=Strict");
+	}
 
-		MultiValueMap<String, ResponseCookie> cookies = exchange.getResponse().getCookies();
+	private void assertCookieValue(String expected) {
+		MultiValueMap<String, ResponseCookie> cookies = this.exchange.getResponse().getCookies();
 		assertThat(cookies).hasSize(1);
 		ResponseCookie cookie = cookies.getFirst(this.resolver.getCookieName());
 		assertThat(cookie).isNotNull();
-		assertThat(cookie.toString()).isEqualTo("SESSION=123; Path=/; Domain=example.org; HttpOnly; SameSite=Strict");
+		assertThat(cookie.toString()).isEqualTo(expected);
 	}
 
 }