handle postgres without password

fixes #4

tests/configs.rs

@@ -177,6 +177,31 @@ fn test_parse_postgres_socket() {
     );
 }
 
+#[test]
+fn test_parse_postgres_socket_no_pass() {
+    let config = config_from_file("tests/configs/postgres_socket_no_pass.php");
+    assert_debug_equal(
+        &Database::Postgres {
+            database: "nextcloud".to_string(),
+            username: "redacted".to_string(),
+            password: "".to_string(),
+            connect: DbConnect::Socket("/var/run/postgresql".into()),
+            ssl_options: SslOptions::Default,
+        },
+        &config.database,
+    );
+    #[cfg(feature = "db-sqlx")]
+    assert_debug_equal(
+        AnyConnectOptions::from(
+            PgConnectOptions::new()
+                .socket("/var/run/postgresql")
+                .username("redacted")
+                .database("nextcloud"),
+        ),
+        config.database.into(),
+    );
+}
+
 #[test]
 fn test_parse_postgres_socket_folder() {
     let config = config_from_file("tests/configs/postgres_socket_folder.php");

tests/configs/postgres_socket_no_pass.php

@@ -0,0 +1,14 @@
+<?php
+
+$CONFIG = [
+	'overwrite.cli.url' => 'https://cloud.example.com',
+	'dbtype' => 'pgsql',
+	'dbname' => 'nextcloud',
+	'dbhost' => 'localhost:/var/run/postgresql/.s.PGSQL.5432',
+	'dbport' => '',
+	'dbtableprefix' => 'oc_',
+	'dbuser' => 'redacted',
+	'redis' => [
+		'host' => 'localhost'
+	]
+];