Allow that the DEFAULT_URI does not end with a slash

We normalize the url with an env var processor before passing it to the saml lib, to avoid an error. Fixes issue #1118

.env

@@ -32,7 +32,6 @@ DATABASE_EMULATE_NATURAL_SORT=0
 ###################################################################################
 
 # The public reachable URL of this Part-DB installation. This is used for generating links in SAML and email templates or when no request context is available.
-# This must end with a slash!
 DEFAULT_URI="https://partdb.changeme.invalid/"
 
 ###################################################################################

config/parameters.yaml

@@ -10,7 +10,7 @@ parameters:
   partdb.title: '%env(string:settings:customization:instanceName)%'  # The title shown inside of Part-DB (e.g. in the navbar and on homepage)
   partdb.locale_menu: ['en', 'de', 'it', 'fr', 'ru', 'ja', 'cs', 'da', 'zh', 'pl', 'hu']    # The languages that are shown in user drop down menu
 
-  partdb.default_uri: '%env(string:DEFAULT_URI)%'             # The default URI to use for the Part-DB instance (e.g. https://part-db.example.com/). This is used for generating links in emails
+  partdb.default_uri: '%env(addSlash:string:DEFAULT_URI)%'             # The default URI to use for the Part-DB instance (e.g. https://part-db.example.com/). This is used for generating links in emails
 
   partdb.db.emulate_natural_sort: '%env(bool:DATABASE_EMULATE_NATURAL_SORT)%' # If this is set to true, natural sorting is emulated on platforms that do not support it natively. This can be slow on large datasets.
 

src/EnvVarProcessors/AddSlashEnvVarProcessor.php

@@ -0,0 +1,49 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2025 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+
+namespace App\EnvVarProcessors;
+
+use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;
+
+/**
+ * Env var processor that adds a trailing slash to a string if not already present.
+ */
+final class AddSlashEnvVarProcessor implements EnvVarProcessorInterface
+{
+
+    public function getEnv(string $prefix, string $name, \Closure $getEnv): mixed
+    {
+        $env = $getEnv($name);
+        if (!is_string($env)) {
+            throw new \InvalidArgumentException(sprintf('The "addSlash" env var processor only works with strings, got %s.', gettype($env)));
+        }
+        return rtrim($env, '/') . '/';
+    }
+
+    public static function getProvidedTypes(): array
+    {
+        return [
+            'addSlash' => 'string',
+        ];
+    }
+}

src/EnvVarProcessors/CustomEnvVarProcessor.php

@@ -20,7 +20,7 @@
 
 declare(strict_types=1);
 
-namespace App\Services;
+namespace App\EnvVarProcessors;
 
 use Closure;
 use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;

tests/EnvVarProcessors/AddSlashEnvVarProcessorTest.php

@@ -0,0 +1,44 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2025 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Tests\EnvVarProcessors;
+
+use App\EnvVarProcessors\AddSlashEnvVarProcessor;
+use PHPUnit\Framework\TestCase;
+
+class AddSlashEnvVarProcessorTest extends TestCase
+{
+    protected AddSlashEnvVarProcessor $processor;
+
+    protected function setUp(): void
+    {
+        $this->processor = new AddSlashEnvVarProcessor();
+    }
+
+    public function testGetEnv(): void
+    {
+        $getEnv = function ($name) {
+            return $name;
+        };
+
+        $this->assertEquals('http://example.com/', $this->processor->getEnv('addSlash', 'http://example.com', $getEnv));
+        $this->assertEquals('http://example.com/', $this->processor->getEnv('addSlash', 'http://example.com/', $getEnv));
+    }
+}