Fix cycle in DefaultOAuth2AuthorizationRequestResolver

DefaultOAuth2AuthorizationRequestResolver should not depend on
OAuth2AuthorizationRequestRedirectFilter because
OAuth2AuthorizationRequestRedirectFilter already depends on
DefaultOAuth2AuthorizationRequestResolver.

OAuth2AuthorizationRequestRedirectFilter also takes advantage of the
new constructor that defaults the base uri.

Polishes gh-16384

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

@@ -66,6 +66,11 @@ import org.springframework.web.util.UriComponentsBuilder;
  */
 public final class DefaultOAuth2AuthorizationRequestResolver implements OAuth2AuthorizationRequestResolver {
 
+	/**
+	 * The default base {@code URI} used for authorization requests.
+	 */
+	public static final String DEFAULT_AUTHORIZATION_REQUEST_BASE_URI = "/oauth2/authorization";
+
 	private static final String REGISTRATION_ID_URI_VARIABLE_NAME = "registrationId";
 
 	private static final char PATH_DELIMITER = '/';
@@ -93,8 +98,7 @@ public final class DefaultOAuth2AuthorizationRequestResolver implements OAuth2Au
 	 * authorization requests
 	 */
 	public DefaultOAuth2AuthorizationRequestResolver(ClientRegistrationRepository clientRegistrationRepository) {
-		this(clientRegistrationRepository,
-				OAuth2AuthorizationRequestRedirectFilter.DEFAULT_AUTHORIZATION_REQUEST_BASE_URI);
+		this(clientRegistrationRepository, DEFAULT_AUTHORIZATION_REQUEST_BASE_URI);
 	}
 
 	/**

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/OAuth2AuthorizationRequestRedirectFilter.java

@@ -87,7 +87,7 @@ public class OAuth2AuthorizationRequestRedirectFilter extends OncePerRequestFilt
 	/**
 	 * The default base {@code URI} used for authorization requests.
 	 */
-	public static final String DEFAULT_AUTHORIZATION_REQUEST_BASE_URI = "/oauth2/authorization";
+	public static final String DEFAULT_AUTHORIZATION_REQUEST_BASE_URI = DefaultOAuth2AuthorizationRequestResolver.DEFAULT_AUTHORIZATION_REQUEST_BASE_URI;
 
 	private final ThrowableAnalyzer throwableAnalyzer = new DefaultThrowableAnalyzer();
 
@@ -107,7 +107,7 @@ public class OAuth2AuthorizationRequestRedirectFilter extends OncePerRequestFilt
 	 * @param clientRegistrationRepository the repository of client registrations
 	 */
 	public OAuth2AuthorizationRequestRedirectFilter(ClientRegistrationRepository clientRegistrationRepository) {
-		this(clientRegistrationRepository, DEFAULT_AUTHORIZATION_REQUEST_BASE_URI);
+		this(new DefaultOAuth2AuthorizationRequestResolver(clientRegistrationRepository));
 	}
 
 	/**
@@ -119,10 +119,7 @@ public class OAuth2AuthorizationRequestRedirectFilter extends OncePerRequestFilt
 	 */
 	public OAuth2AuthorizationRequestRedirectFilter(ClientRegistrationRepository clientRegistrationRepository,
 			String authorizationRequestBaseUri) {
-		Assert.notNull(clientRegistrationRepository, "clientRegistrationRepository cannot be null");
-		Assert.hasText(authorizationRequestBaseUri, "authorizationRequestBaseUri cannot be empty");
-		this.authorizationRequestResolver = new DefaultOAuth2AuthorizationRequestResolver(clientRegistrationRepository,
-				authorizationRequestBaseUri);
+		this(new DefaultOAuth2AuthorizationRequestResolver(clientRegistrationRepository, authorizationRequestBaseUri));
 	}
 
 	/**

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

@@ -97,6 +97,12 @@ public class DefaultOAuth2AuthorizationRequestResolverTests {
 				this.authorizationRequestBaseUri);
 	}
 
+	@Test
+	void authorizationRequestBaseUriEqualToRedirectFilter() {
+		assertThat(DefaultOAuth2AuthorizationRequestResolver.DEFAULT_AUTHORIZATION_REQUEST_BASE_URI)
+			.isEqualTo(OAuth2AuthorizationRequestRedirectFilter.DEFAULT_AUTHORIZATION_REQUEST_BASE_URI);
+	}
+
 	@Test
 	public void constructorWhenClientRegistrationRepositoryIsNullThenThrowIllegalArgumentException() {
 		assertThatIllegalArgumentException()