DATAMONGO-1260 - Prevent accidental authentication misconfiguration on SimpleMongoDbFactory.

We now reject configuration using MongoClient along with UserCredentials in SimpleMongoDbFactory. This move favors the native authentication mechanism provided via MongoCredential.

<mongo:mongo-client id="mongo-client-with-credentials" credentials="jon:warg@snow?uri.authMechanism=PLAIN" />

Original pull request: #309.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/SimpleMongoDbFactory.java

@@ -19,6 +19,7 @@ import java.net.UnknownHostException;
 
 import org.springframework.beans.factory.DisposableBean;
 import org.springframework.dao.DataAccessException;
+import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.dao.support.PersistenceExceptionTranslator;
 import org.springframework.data.authentication.UserCredentials;
 import org.springframework.data.mongodb.MongoDbFactory;
@@ -103,8 +104,8 @@ public class SimpleMongoDbFactory implements DisposableBean, MongoDbFactory {
 	 */
 	@Deprecated
 	public SimpleMongoDbFactory(MongoURI uri) throws MongoException, UnknownHostException {
-		this(new Mongo(uri), uri.getDatabase(), new UserCredentials(uri.getUsername(), parseChars(uri.getPassword())),
-				true, uri.getDatabase());
+		this(new Mongo(uri), uri.getDatabase(), new UserCredentials(uri.getUsername(), parseChars(uri.getPassword())), true,
+				uri.getDatabase());
 	}
 
 	/**
@@ -132,6 +133,11 @@ public class SimpleMongoDbFactory implements DisposableBean, MongoDbFactory {
 	private SimpleMongoDbFactory(Mongo mongo, String databaseName, UserCredentials credentials,
 			boolean mongoInstanceCreated, String authenticationDatabaseName) {
 
+		if (mongo instanceof MongoClient && (credentials != null && !UserCredentials.NO_CREDENTIALS.equals(credentials))) {
+			throw new InvalidDataAccessApiUsageException(
+					"Usage of 'UserCredentials' with 'MongoClient' is no longer supported. Please use 'MongoCredential' for 'MongoClient' or just 'Mongo'.");
+		}
+
 		Assert.notNull(mongo, "Mongo must not be null");
 		Assert.hasText(databaseName, "Database name must not be empty");
 		Assert.isTrue(databaseName.matches("[\\w-]+"),

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/SimpleMongoDbFactoryUnitTests.java

@@ -22,10 +22,13 @@ import static org.springframework.test.util.ReflectionTestUtils.*;
 
 import java.net.UnknownHostException;
 
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.authentication.UserCredentials;
 import org.springframework.data.mongodb.MongoDbFactory;
 
@@ -43,6 +46,7 @@ import com.mongodb.MongoURI;
 @RunWith(MockitoJUnitRunner.class)
 public class SimpleMongoDbFactoryUnitTests {
 
+	public @Rule ExpectedException expectedException = ExpectedException.none();
 	@Mock Mongo mongo;
 
 	/**
@@ -115,6 +119,46 @@ public class SimpleMongoDbFactoryUnitTests {
 		assertThat(getField(factory, "authenticationDatabaseName").toString(), is("FooBar"));
 	}
 
+	/**
+	 * @see DATAMONGO-1260
+	 */
+	@Test
+	public void rejectsMongoClientWithUserCredentials() {
+
+		expectedException.expect(InvalidDataAccessApiUsageException.class);
+		expectedException.expectMessage("use 'MongoCredential' for 'MongoClient'");
+
+		new SimpleMongoDbFactory(mock(MongoClient.class), "cairhienin", new UserCredentials("moiraine", "sedai"));
+	}
+
+	/**
+	 * @see DATAMONGO-1260
+	 */
+	@Test
+	public void rejectsMongoClientWithUserCredentialsAndAuthDb() {
+
+		expectedException.expect(InvalidDataAccessApiUsageException.class);
+		expectedException.expectMessage("use 'MongoCredential' for 'MongoClient'");
+
+		new SimpleMongoDbFactory(mock(MongoClient.class), "malkieri", new UserCredentials("lan", "mandragoran"), "authdb");
+	}
+
+	/**
+	 * @see DATAMONGO-1260
+	 */
+	@Test
+	public void shouldNotRejectMongoClientWithNoCredentials() {
+		new SimpleMongoDbFactory(mock(MongoClient.class), "andoran", UserCredentials.NO_CREDENTIALS);
+	}
+
+	/**
+	 * @see DATAMONGO-1260
+	 */
+	@Test
+	public void shouldNotRejectMongoClientWithEmptyUserCredentials() {
+		new SimpleMongoDbFactory(mock(MongoClient.class), "shangtai", new UserCredentials("", ""));
+	}
+
 	@SuppressWarnings("deprecation")
 	private void rejectsDatabaseName(String databaseName) {