Add default authorizationRequestBaseUri to DefaultOAuth2AuthorizationRequestResolver

Closes gh-16383

Signed-off-by: DingHao <dh.hiekn@gmail.com>

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/DefaultOAuth2AuthorizationRequestResolver.java

@@ -86,6 +86,17 @@ public final class DefaultOAuth2AuthorizationRequestResolver implements OAuth2Au
 	private Consumer<OAuth2AuthorizationRequest.Builder> authorizationRequestCustomizer = (customizer) -> {
 	};
 
+	/**
+	 * Constructs a {@code DefaultOAuth2AuthorizationRequestResolver} using the provided
+	 * parameters.
+	 * @param clientRegistrationRepository the repository of client registrations
+	 * authorization requests
+	 */
+	public DefaultOAuth2AuthorizationRequestResolver(ClientRegistrationRepository clientRegistrationRepository) {
+		this(clientRegistrationRepository,
+				OAuth2AuthorizationRequestRedirectFilter.DEFAULT_AUTHORIZATION_REQUEST_BASE_URI);
+	}
+
 	/**
 	 * Constructs a {@code DefaultOAuth2AuthorizationRequestResolver} using the provided
 	 * parameters.

oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/web/DefaultOAuth2AuthorizationRequestResolverTests.java

@@ -568,6 +568,18 @@ public class DefaultOAuth2AuthorizationRequestResolverTests {
 						+ "nonce=([a-zA-Z0-9\\-\\.\\_\\~]){43}&" + "appid=client-id");
 	}
 
+	@Test
+	public void resolveWhenAuthorizationRequestNoProvideAuthorizationRequestBaseUri() {
+		OAuth2AuthorizationRequestResolver resolver = new DefaultOAuth2AuthorizationRequestResolver(
+				this.clientRegistrationRepository);
+		String requestUri = this.authorizationRequestBaseUri + "/" + this.registration2.getRegistrationId();
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", requestUri);
+		request.setServletPath(requestUri);
+		OAuth2AuthorizationRequest authorizationRequest = resolver.resolve(request);
+		assertThat(authorizationRequest.getRedirectUri())
+			.isEqualTo("http://localhost/login/oauth2/code/" + this.registration2.getRegistrationId());
+	}
+
 	@Test
 	public void resolveWhenAuthorizationRequestProvideCodeChallengeMethod() {
 		ClientRegistration clientRegistration = this.pkceClientRegistration;