Re-enable support for invalid Expires attributes in MockCookie

Changes introduced in commit 9b20876
caused a regression for Cookie support in MockHttpServletResponse.
Specifically, an Expires attribute that cannot be parsed using
`ZonedDateTime.parse()` now results in an exception; whereas,
previously an entry such as `Expires=0` was allowed.

This commit fixes this issue in MockCookie by catching and ignoring any
DateTimeException thrown while attempting to parse an Expires attribute.

Closes gh-23911

Author: sbrannen

spring-test/src/main/java/org/springframework/mock/web/MockCookie.java

@@ -16,6 +16,7 @@
 
 package org.springframework.mock.web;
 
+import java.time.DateTimeException;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 
@@ -31,6 +32,7 @@
  *
  * @author Vedran Pavic
  * @author Juergen Hoeller
+ * @author Sam Brannen
  * @since 5.1
  */
 public class MockCookie extends Cookie {
@@ -119,8 +121,13 @@ else if (StringUtils.startsWithIgnoreCase(attribute, "Max-Age")) {
 				cookie.setMaxAge(Integer.parseInt(extractAttributeValue(attribute, setCookieHeader)));
 			}
 			else if (StringUtils.startsWithIgnoreCase(attribute, "Expires")) {
-				cookie.setExpires(ZonedDateTime.parse(extractAttributeValue(attribute, setCookieHeader),
-						DateTimeFormatter.RFC_1123_DATE_TIME));
+				try {
+					cookie.setExpires(ZonedDateTime.parse(extractAttributeValue(attribute, setCookieHeader),
+							DateTimeFormatter.RFC_1123_DATE_TIME));
+				}
+				catch (DateTimeException ex) {
+					// ignore invalid date formats
+				}
 			}
 			else if (StringUtils.startsWithIgnoreCase(attribute, "Path")) {
 				cookie.setPath(extractAttributeValue(attribute, setCookieHeader));

spring-test/src/test/java/org/springframework/mock/web/MockCookieTests.java

@@ -16,13 +16,13 @@
 
 package org.springframework.mock.web;
 
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
-import java.time.ZonedDateTime;
-import java.time.format.DateTimeFormatter;
-
 import static org.junit.Assert.*;
 
 /**
@@ -84,6 +84,22 @@ public void parseHeaderWithAttributes() {
 		assertEquals("Lax", cookie.getSameSite());
 	}
 
+	@Test
+	public void parseHeaderWithZeroExpiresAttribute() {
+		MockCookie cookie = MockCookie.parse("SESSION=123; Expires=0");
+
+		assertCookie(cookie, "SESSION", "123");
+		assertNull(cookie.getExpires());
+	}
+
+	@Test
+	public void parseHeaderWithBogusExpiresAttribute() {
+		MockCookie cookie = MockCookie.parse("SESSION=123; Expires=bogus");
+
+		assertCookie(cookie, "SESSION", "123");
+		assertNull(cookie.getExpires());
+	}
+
 	private void assertCookie(MockCookie cookie, String name, String value) {
 		assertEquals(name, cookie.getName());
 		assertEquals(value, cookie.getValue());
@@ -116,7 +132,7 @@ public void parseInvalidAttribute() {
 	public void parseHeaderWithAttributesCaseSensitivity() {
 		MockCookie cookie = MockCookie.parse("SESSION=123; domain=example.com; max-age=60; " +
 				"expires=Tue, 8 Oct 2019 19:50:00 GMT; path=/; secure; httponly; samesite=Lax");
-		
+
 		assertCookie(cookie, "SESSION", "123");
 		assertEquals("example.com", cookie.getDomain());
 		assertEquals(60, cookie.getMaxAge());

spring-test/src/test/java/org/springframework/mock/web/MockHttpServletResponseTests.java

@@ -351,6 +351,20 @@ public void setCookieHeaderWithExpiresAttribute() {
 		assertEquals(cookieValue, response.getHeader(HttpHeaders.SET_COOKIE));
 	}
 
+	/**
+	 * @since 5.1.12
+	 */
+	@Test
+	public void setCookieHeaderWithZeroExpiresAttribute() {
+		String cookieValue = "SESSION=123; Path=/; Max-Age=100; Expires=0";
+		response.setHeader(HttpHeaders.SET_COOKIE, cookieValue);
+		assertNumCookies(1);
+		String header = response.getHeader(HttpHeaders.SET_COOKIE);
+		assertNotEquals(cookieValue, header);
+		// We don't assert the actual Expires value since it is based on the current time.
+		assertTrue(header.startsWith("SESSION=123; Path=/; Max-Age=100; Expires="));
+	}
+
 	@Test
 	public void addCookieHeader() {
 		response.addHeader(HttpHeaders.SET_COOKIE, "SESSION=123; Path=/; Secure; HttpOnly; SameSite=Lax");
@@ -375,6 +389,20 @@ public void addCookieHeaderWithExpiresAttribute() {
 		assertEquals(cookieValue, response.getHeader(HttpHeaders.SET_COOKIE));
 	}
 
+	/**
+	 * @since 5.1.12
+	 */
+	@Test
+	public void addCookieHeaderWithZeroExpiresAttribute() {
+		String cookieValue = "SESSION=123; Path=/; Max-Age=100; Expires=0";
+		response.addHeader(HttpHeaders.SET_COOKIE, cookieValue);
+		assertNumCookies(1);
+		String header = response.getHeader(HttpHeaders.SET_COOKIE);
+		assertNotEquals(cookieValue, header);
+		// We don't assert the actual Expires value since it is based on the current time.
+		assertTrue(header.startsWith("SESSION=123; Path=/; Max-Age=100; Expires="));
+	}
+
 	@Test
 	public void addCookie() {
 		MockCookie mockCookie = new MockCookie("SESSION", "123");

spring-web/src/test/java/org/springframework/mock/web/test/MockCookie.java

@@ -16,6 +16,7 @@
 
 package org.springframework.mock.web.test;
 
+import java.time.DateTimeException;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 
@@ -31,6 +32,7 @@
  *
  * @author Vedran Pavic
  * @author Juergen Hoeller
+ * @author Sam Brannen
  * @since 5.1
  */
 public class MockCookie extends Cookie {
@@ -119,8 +121,13 @@ else if (StringUtils.startsWithIgnoreCase(attribute, "Max-Age")) {
 				cookie.setMaxAge(Integer.parseInt(extractAttributeValue(attribute, setCookieHeader)));
 			}
 			else if (StringUtils.startsWithIgnoreCase(attribute, "Expires")) {
-				cookie.setExpires(ZonedDateTime.parse(extractAttributeValue(attribute, setCookieHeader),
-						DateTimeFormatter.RFC_1123_DATE_TIME));
+				try {
+					cookie.setExpires(ZonedDateTime.parse(extractAttributeValue(attribute, setCookieHeader),
+							DateTimeFormatter.RFC_1123_DATE_TIME));
+				}
+				catch (DateTimeException ex) {
+					// ignore invalid date formats
+				}
 			}
 			else if (StringUtils.startsWithIgnoreCase(attribute, "Path")) {
 				cookie.setPath(extractAttributeValue(attribute, setCookieHeader));