Add JDBC based implementation for RelyingPartyRegistrationRepository

Closes gh-16012

Signed-off-by: amirelgayed <[email protected]>

saml2/saml2-service-provider/spring-security-saml2-service-provider.gradle

@@ -105,6 +105,7 @@ dependencies {
 
 	provided 'jakarta.servlet:jakarta.servlet-api'
 
+	optional 'org.springframework:spring-jdbc'
 	optional 'com.fasterxml.jackson.core:jackson-databind'
 
 	testImplementation 'com.squareup.okhttp3:mockwebserver'

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/registration/JdbcRelyingPartyRegistrationRepository.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.registration;
+
+import org.springframework.jdbc.core.*;
+import org.springframework.util.Assert;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+
+import java.io.ByteArrayInputStream;
+import java.sql.ResultSet;
+import java.sql.Types;
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * A JDBC implementation of {@link RelyingPartyRegistrationRepository}. Also
+ * implements {@link Iterable} to simplify the default login page.
+ *
+ * @author َAmir Elgayed
+ * @since 6.5
+ */
+
+// TODO https://github.com/spring-projects/spring-security/issues/16012
+public class JdbcRelyingPartyRegistrationRepository implements RelyingPartyRegistrationRepository {
+	// TODO add logging
+	private final JdbcOperations jdbcOperations;
+
+	// TODO ticket specifies that data is saved in the DB as XML
+	private static final String TABLE_NAME = "relying_party_registration";
+
+	private static final String[] COLUMN_NAMES = {"id", "metadata"};
+
+	private static final String JOINT_COLUMN_NAMES = String.join(", ", COLUMN_NAMES);
+
+	private static final String FILTER = "id = ?";
+
+	// @formatter:off
+	private static final String SAVE_RELYING_PARTY_REGISTRATION_SQL = "INSERT INTO " + TABLE_NAME
+			+ " (" + JOINT_COLUMN_NAMES + ")"
+			+ " VALUES ("
+			+ Arrays.stream(COLUMN_NAMES).map(columnName -> "?").collect(Collectors.joining(", "))
+			+")";
+
+	private static final String SELECT_RELYING_PARTY_REGISTRATION_SQL = "SELECT "
+			+ JOINT_COLUMN_NAMES
+			+ " FROM " + TABLE_NAME
+			+ " WHERE " + FILTER;
+	// @formatter:on
+
+	private static final String DELETE_RELYING_PARTY_REGISTRATION_SQL = "DELETE FROM " + TABLE_NAME + " WHERE " + FILTER;
+
+	/**
+	 * Constructs a {@code JdbcRelyingPartyRegistrationRepository} using the provide parameters.
+	 * @param jdbcOperations the JDBC operations
+	 */
+	public JdbcRelyingPartyRegistrationRepository(JdbcOperations jdbcOperations) {
+		Assert.notNull(jdbcOperations, "jdbcOperations cannot be null");
+		this.jdbcOperations = jdbcOperations;
+	}
+
+	// TODO to be removed
+	private static Map<String, RelyingPartyRegistration> createMappingToIdentityProvider(
+			Collection<RelyingPartyRegistration> rps) {
+		LinkedHashMap<String, RelyingPartyRegistration> result = new LinkedHashMap<>();
+		for (RelyingPartyRegistration rp : rps) {
+			Assert.notNull(rp, "relying party collection cannot contain null values");
+			String key = rp.getRegistrationId();
+			Assert.notNull(key, "relying party identifier cannot be null");
+			Assert.isNull(result.get(key), () -> "relying party duplicate identifier '" + key + "' detected.");
+			result.put(key, rp);
+		}
+		return Collections.unmodifiableMap(result);
+	}
+
+	// TODO to be removed
+	private static Map<String, List<RelyingPartyRegistration>> createMappingByAssertingPartyEntityId(
+			Collection<RelyingPartyRegistration> rps) {
+		MultiValueMap<String, RelyingPartyRegistration> result = new LinkedMultiValueMap<>();
+		for (RelyingPartyRegistration rp : rps) {
+			result.add(rp.getAssertingPartyMetadata().getEntityId(), rp);
+		}
+		return Collections.unmodifiableMap(result);
+	}
+
+	private String fetchRelyingRegistryMetadata(String id){
+		SqlParameterValue[] parameters = { new SqlParameterValue(Types.VARCHAR, id) };
+		PreparedStatementSetter pss = new ArgumentPreparedStatementSetter(parameters);
+		return this.jdbcOperations.query(
+				SELECT_RELYING_PARTY_REGISTRATION_SQL,
+				pss,
+				(ResultSet rs) -> rs.getString("metadata")
+		);
+	}
+
+	// TODO test contract: return null if no match is found
+	@Override
+	public RelyingPartyRegistration findByRegistrationId(String id) {
+		String metadata = fetchRelyingRegistryMetadata(id);
+		return RelyingPartyRegistrations.fromMetadata(new ByteArrayInputStream(metadata.getBytes())).build();
+	}
+}