Merge pull request #43771 from hezean

* gh-43771:
  Polish "Add support for empty password in bitnami/postgresql"
  Add support for empty password in bitnami/postgresql

Closes gh-43771

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 {
 

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 {
 

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

@@ -67,8 +67,9 @@ 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), "No PostgreSQL password found");
+		return (password != null) ? 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

@@ -39,7 +39,7 @@ class PostgresEnvironmentTests {
 	@Test
 	void createWhenNoPostgresPasswordThrowsException() {
 		assertThatIllegalStateException().isThrownBy(() -> new PostgresEnvironment(Collections.emptyMap()))
-			.withMessage("PostgreSQL password must be provided");
+			.withMessage("No PostgreSQL password found");
 	}
 
 	@Test
@@ -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"));