Add support for empty password in bitnami/postgresql

See gh-43771

Signed-off-by: He Zean <realhezean@gmail.com>

spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests.java

@@ -35,6 +35,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Andy Wilkinson
  * @author Phillip Webb
  * @author Scott Frederick
+ * @author He Zean
  */
 class PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests {
 
@@ -60,6 +61,16 @@ class PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests {
 		checkDatabaseAccess(connectionDetails);
 	}
 
+	@DockerComposeTest(composeFile = "postgres-bitnami-empty-password-compose.yaml",
+			image = TestImage.BITNAMI_POSTGRESQL)
+	void runWithBitnamiImageCreatesConnectionDetailsWithAllowEmptyPassword(JdbcConnectionDetails connectionDetails)
+			throws ClassNotFoundException {
+		assertThat(connectionDetails.getUsername()).isEqualTo("myuser");
+		assertThat(connectionDetails.getPassword()).isEmpty();
+		assertThat(connectionDetails.getJdbcUrl()).startsWith("jdbc:postgresql://").endsWith("/mydatabase");
+		checkDatabaseAccess(connectionDetails);
+	}
+
 	@DockerComposeTest(composeFile = "postgres-application-name-compose.yaml", image = TestImage.POSTGRESQL)
 	void runCreatesConnectionDetailsApplicationName(JdbcConnectionDetails connectionDetails)
 			throws ClassNotFoundException {

spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests.java

@@ -37,6 +37,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Andy Wilkinson
  * @author Phillip Webb
  * @author Scott Frederick
+ * @author He Zean
  */
 class PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests {
 
@@ -63,6 +64,17 @@ class PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests {
 		checkDatabaseAccess(connectionDetails);
 	}
 
+	@DockerComposeTest(composeFile = "postgres-bitnami-empty-password-compose.yaml",
+			image = TestImage.BITNAMI_POSTGRESQL)
+	void runWithBitnamiImageCreatesConnectionDetailsWithAllowEmptyPassword(R2dbcConnectionDetails connectionDetails) {
+		ConnectionFactoryOptions connectionFactoryOptions = connectionDetails.getConnectionFactoryOptions();
+		assertThat(connectionFactoryOptions.getRequiredValue(ConnectionFactoryOptions.USER)).isEqualTo("myuser");
+		assertThat(connectionFactoryOptions.getValue(ConnectionFactoryOptions.PASSWORD)).isNull();
+		assertThat(connectionFactoryOptions.getRequiredValue(ConnectionFactoryOptions.DATABASE))
+			.isEqualTo("mydatabase");
+		checkDatabaseAccess(connectionDetails);
+	}
+
 	@DockerComposeTest(composeFile = "postgres-application-name-compose.yaml", image = TestImage.POSTGRESQL)
 	void runCreatesConnectionDetailsApplicationName(R2dbcConnectionDetails connectionDetails) {
 		assertConnectionDetails(connectionDetails);

spring-boot-project/spring-boot-docker-compose/src/dockerTest/resources/org/springframework/boot/docker/compose/service/connection/postgres/postgres-bitnami-empty-password-compose.yaml

@@ -0,0 +1,9 @@
+services:
+  database:
+    image: '{imageName}'
+    ports:
+      - '5432'
+    environment:
+      - 'POSTGRESQL_USERNAME=myuser'
+      - 'POSTGRESQL_DATABASE=mydatabase'
+      - 'ALLOW_EMPTY_PASSWORD=yes'

spring-boot-project/spring-boot-docker-compose/src/main/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironment.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.docker.compose.service.connection.postgres;
 
 import java.util.Map;
+import java.util.Objects;
 
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
@@ -67,8 +68,9 @@ class PostgresEnvironment {
 			return null;
 		}
 		String password = env.getOrDefault("POSTGRES_PASSWORD", env.get("POSTGRESQL_PASSWORD"));
-		Assert.state(StringUtils.hasLength(password), "PostgreSQL password must be provided");
-		return password;
+		boolean allowEmpty = env.containsKey("ALLOW_EMPTY_PASSWORD");
+		Assert.state(allowEmpty || StringUtils.hasLength(password), "PostgreSQL password must be provided");
+		return Objects.requireNonNullElse(password, "");
 	}
 
 	private boolean isUsingTrustHostAuthMethod(Map<String, String> env) {

spring-boot-project/spring-boot-docker-compose/src/test/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironmentTests.java

@@ -93,6 +93,12 @@ class PostgresEnvironmentTests {
 		assertThat(environment.getPassword()).isNull();
 	}
 
+	@Test
+	void getPasswordWhenHasNoPasswordAndAllowEmptyPassword() {
+		PostgresEnvironment environment = new PostgresEnvironment(Map.of("ALLOW_EMPTY_PASSWORD", "yes"));
+		assertThat(environment.getPassword()).isEmpty();
+	}
+
 	@Test
 	void getDatabaseWhenNoPostgresDbOrPostgresUser() {
 		PostgresEnvironment environment = new PostgresEnvironment(Map.of("POSTGRES_PASSWORD", "secret"));