Add equals and hashCode to HttpMethodRequestMatcher

Closes gh-18911

Signed-off-by: Tran Ngoc Nhan <ngocnhan.tran1996@gmail.com>

Author: ngocnhan-tran1996

web/src/main/java/org/springframework/security/web/servlet/util/matcher/PathPatternRequestMatcher.java

@@ -305,6 +305,19 @@ public boolean matches(HttpServletRequest request) {
 			return this.method.name().equals(request.getMethod());
 		}
 
+		@Override
+		public boolean equals(Object o) {
+			if (!(o instanceof HttpMethodRequestMatcher that)) {
+				return false;
+			}
+			return Objects.equals(this.method, that.method);
+		}
+
+		@Override
+		public int hashCode() {
+			return Objects.hash(this.method);
+		}
+
 		@Override
 		public String toString() {
 			return "HttpMethod [" + this.method + "]";

web/src/test/java/org/springframework/security/web/servlet/util/matcher/PathPatternRequestMatcherTests.java

@@ -145,6 +145,17 @@ void matcherWhenBasePathIsRootThenNoDoubleSlash() {
 		assertThat(matcher.matches(mock)).isTrue();
 	}
 
+	// gh-18911
+	@Test
+	void testEqualsWithSameAndDifferentHttpMethod() {
+		PathPatternRequestMatcher.Builder builder = PathPatternRequestMatcher.withDefaults();
+		PathPatternRequestMatcher matcher1 = builder.matcher(HttpMethod.GET, "/foo");
+		PathPatternRequestMatcher matcher2 = builder.matcher(HttpMethod.GET, "/foo");
+		PathPatternRequestMatcher matcher3 = builder.matcher(HttpMethod.POST, "/foo");
+		assertThat(matcher1).isEqualTo(matcher2);
+		assertThat(matcher1).isNotEqualTo(matcher3);
+	}
+
 	MockHttpServletRequest request(String uri) {
 		MockHttpServletRequest request = new MockHttpServletRequest("GET", uri);
 		ServletRequestPathUtils.parseAndCache(request);