feat: Amend jcdelepine's previous patch

src/Uri/PortUtil.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Copyright 2026 The Horde Project (http://www.horde.org/)
+ *
+ * See the enclosed file LICENSE for license information (LGPL). If you
+ * did not receive this file, see http://www.horde.org/licenses/lgpl21.
+ *
+ * @category  Horde
+ * @copyright 2026 The Horde Project
+ * @license   http://www.horde.org/licenses/lgpl21 LGPL 2.1
+ * @package   Core
+ */
+
+namespace Horde\Core\Uri;
+
+/**
+ * Utility for IANA default port handling.
+ */
+class PortUtil
+{
+    private const SCHEME_DEFAULTS = [
+        'http' => 80,
+        'https' => 443,
+    ];
+
+    /**
+     * Whether a port is the IANA default for the given scheme.
+     *
+     * Returns true when the port can be omitted from a URI without
+     * changing its meaning (RFC 3986 section 3.2.3).
+     */
+    public static function isIanaDefault(string $scheme, int|string|null $port): bool
+    {
+        if ($port === null || $port === '') {
+            return true;
+        }
+        $default = self::SCHEME_DEFAULTS[strtolower($scheme)] ?? null;
+        return $default !== null && (int) $port === $default;
+    }
+
+    /**
+     * Strip the port from a host:port string when it is the IANA default for the scheme.
+     */
+    public static function stripDefaultPort(string $scheme, string $host): string
+    {
+        if (!str_contains($host, ':')) {
+            return $host;
+        }
+        $lastColon = strrpos($host, ':');
+        $port = substr($host, $lastColon + 1);
+        if (self::isIanaDefault($scheme, $port)) {
+            return substr($host, 0, $lastColon);
+        }
+        return $host;
+    }
+}

src/Uri/RouteUrlWriter.php

@@ -62,9 +62,7 @@ public function absoluteUrlFor(string $routeName, array $params = []): ?string
             ? 'https'
             : 'http';
 
-        // Strip default port to avoid redirect_uri mismatches with strict OIDC providers.
-        $defaultPort = $scheme === 'https' ? '443' : '80';
-        $host = preg_replace('/^(.+):' . $defaultPort . '$/', '$1', $host);
+        $host = PortUtil::stripDefaultPort($scheme, $host);
 
         return $scheme . '://' . $host . $path;
     }

test/Unit/Uri/PortUtilTest.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Horde\Core\Test\Unit\Uri;
+
+use Horde\Core\Uri\PortUtil;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(PortUtil::class)]
+class PortUtilTest extends TestCase
+{
+    /**
+     * @return array<string, array{string, int|string|null, bool}>
+     */
+    public static function isIanaDefaultProvider(): array
+    {
+        return [
+            'https 443 is default' => ['https', 443, true],
+            'http 80 is default' => ['http', 80, true],
+            'https 80 is NOT default' => ['https', 80, false],
+            'http 443 is NOT default' => ['http', 443, false],
+            'https 8443 is NOT default' => ['https', 8443, false],
+            'http 8080 is NOT default' => ['http', 8080, false],
+            'null port is default' => ['https', null, true],
+            'empty string port is default' => ['http', '', true],
+            'string 443 on https' => ['https', '443', true],
+            'string 80 on http' => ['http', '80', true],
+            'string 443 on http' => ['http', '443', false],
+            'ftp 21 unknown scheme' => ['ftp', 21, false],
+        ];
+    }
+
+    #[Test]
+    #[DataProvider('isIanaDefaultProvider')]
+    public function isIanaDefault(string $scheme, int|string|null $port, bool $expected): void
+    {
+        $this->assertSame($expected, PortUtil::isIanaDefault($scheme, $port));
+    }
+
+    /**
+     * @return array<string, array{string, string, string}>
+     */
+    public static function stripDefaultPortProvider(): array
+    {
+        return [
+            'https host:443 stripped' => ['https', 'example.com:443', 'example.com'],
+            'http host:80 stripped' => ['http', 'example.com:80', 'example.com'],
+            'https host:80 kept' => ['https', 'example.com:80', 'example.com:80'],
+            'http host:443 kept' => ['http', 'example.com:443', 'example.com:443'],
+            'https host:8443 kept' => ['https', 'example.com:8443', 'example.com:8443'],
+            'no port unchanged' => ['https', 'example.com', 'example.com'],
+            'http host:8080 kept' => ['http', 'example.com:8080', 'example.com:8080'],
+        ];
+    }
+
+    #[Test]
+    #[DataProvider('stripDefaultPortProvider')]
+    public function stripDefaultPort(string $scheme, string $host, string $expected): void
+    {
+        $this->assertSame($expected, PortUtil::stripDefaultPort($scheme, $host));
+    }
+}