Migrate to OAuth2Client to use PropertyMapper

See gh-9018

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2ClientPropertiesRegistrationAdapter.java

@@ -18,12 +18,10 @@ package org.springframework.boot.autoconfigure.security.oauth2.client;
 
 import java.util.HashMap;
 import java.util.Map;
-import java.util.function.Consumer;
-import java.util.function.Function;
-import java.util.function.Supplier;
 
 import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientProperties.Provider;
 import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientProperties.Registration;
+import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.boot.context.properties.bind.convert.BinderConversionService;
 import org.springframework.core.convert.ConversionException;
 import org.springframework.security.config.oauth2.client.CommonOAuth2Provider;
@@ -56,16 +54,19 @@ final class OAuth2ClientPropertiesRegistrationAdapter {
 	private static ClientRegistration getClientRegistration(String registrationId,
 			Registration properties, Map<String, Provider> providers) {
 		Builder builder = getBuilder(registrationId, properties.getProvider(), providers);
-		copyIfNotNull(properties::getClientId, builder::clientId);
-		copyIfNotNull(properties::getClientSecret, builder::clientSecret);
-		copyIfNotNull(properties::getClientAuthenticationMethod,
-				builder::clientAuthenticationMethod, ClientAuthenticationMethod::new);
-		copyIfNotNull(properties::getAuthorizationGrantType,
-				builder::authorizationGrantType, AuthorizationGrantType::new);
-		copyIfNotNull(properties::getRedirectUriTemplate, builder::redirectUriTemplate);
-		copyIfNotNull(properties::getScope, builder::scope,
-				(scope) -> scope.toArray(new String[scope.size()]));
-		copyIfNotNull(properties::getClientName, builder::clientName);
+		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
+		map.from(properties::getClientId).to(builder::clientId);
+		map.from(properties::getClientSecret).to(builder::clientSecret);
+		map.from(properties::getClientAuthenticationMethod)
+				.as(ClientAuthenticationMethod::new)
+				.to(builder::clientAuthenticationMethod);
+		map.from(properties::getAuthorizationGrantType).as(AuthorizationGrantType::new)
+				.to(builder::authorizationGrantType);
+		map.from(properties::getRedirectUriTemplate).to(builder::redirectUriTemplate);
+		map.from(properties::getScope)
+				.as((scope) -> scope.toArray(new String[scope.size()]))
+				.to(builder::scope);
+		map.from(properties::getClientName).to(builder::clientName);
 		return builder.build();
 	}
 
@@ -95,11 +96,12 @@ final class OAuth2ClientPropertiesRegistrationAdapter {
 	}
 
 	private static Builder getBuilder(Builder builder, Provider provider) {
-		copyIfNotNull(provider::getAuthorizationUri, builder::authorizationUri);
-		copyIfNotNull(provider::getTokenUri, builder::tokenUri);
-		copyIfNotNull(provider::getUserInfoUri, builder::userInfoUri);
-		copyIfNotNull(provider::getJwkSetUri, builder::jwkSetUri);
-		copyIfNotNull(provider::getUserNameAttribute, builder::userNameAttributeName);
+		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
+		map.from(provider::getAuthorizationUri).to(builder::authorizationUri);
+		map.from(provider::getTokenUri).to(builder::tokenUri);
+		map.from(provider::getUserInfoUri).to(builder::userInfoUri);
+		map.from(provider::getJwkSetUri).to(builder::jwkSetUri);
+		map.from(provider::getUserNameAttribute).to(builder::userNameAttributeName);
 		return builder;
 	}
 
@@ -113,16 +115,4 @@ final class OAuth2ClientPropertiesRegistrationAdapter {
 		}
 	}
 
-	private static <T> void copyIfNotNull(Supplier<T> supplier, Consumer<T> consumer) {
-		copyIfNotNull(supplier, consumer, Function.identity());
-	}
-
-	private static <S, C> void copyIfNotNull(Supplier<S> supplier, Consumer<C> consumer,
-			Function<S, C> converter) {
-		S value = supplier.get();
-		if (value != null) {
-			consumer.accept(converter.apply(value));
-		}
-	}
-
 }