feat: Serve well-known assetlinks json

apps/settings/.editorconfig

@@ -7,6 +7,6 @@ end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
 
-[{package.json,.travis.yml,webpack.config.js}]
+[{package.json,.travis.yml,webpack.config.js,assetlinks-template.json}]
 indent_style = space
-indent_size = 2
+indent_size = 2

apps/settings/composer/composer/autoload_classmap.php

@@ -126,6 +126,7 @@
     'OCA\\Settings\\SetupChecks\\Woff2Loading' => $baseDir . '/../lib/SetupChecks/Woff2Loading.php',
     'OCA\\Settings\\UserMigration\\AccountMigrator' => $baseDir . '/../lib/UserMigration/AccountMigrator.php',
     'OCA\\Settings\\UserMigration\\AccountMigratorException' => $baseDir . '/../lib/UserMigration/AccountMigratorException.php',
+    'OCA\\Settings\\WellKnown\\AssetLinksHandler' => $baseDir . '/../lib/WellKnown/AssetLinksHandler.php',
     'OCA\\Settings\\WellKnown\\ChangePasswordHandler' => $baseDir . '/../lib/WellKnown/ChangePasswordHandler.php',
     'OCA\\Settings\\WellKnown\\SecurityTxtHandler' => $baseDir . '/../lib/WellKnown/SecurityTxtHandler.php',
 );

apps/settings/composer/composer/autoload_static.php

@@ -141,6 +141,7 @@ class ComposerStaticInitSettings
         'OCA\\Settings\\SetupChecks\\Woff2Loading' => __DIR__ . '/..' . '/../lib/SetupChecks/Woff2Loading.php',
         'OCA\\Settings\\UserMigration\\AccountMigrator' => __DIR__ . '/..' . '/../lib/UserMigration/AccountMigrator.php',
         'OCA\\Settings\\UserMigration\\AccountMigratorException' => __DIR__ . '/..' . '/../lib/UserMigration/AccountMigratorException.php',
+        'OCA\\Settings\\WellKnown\\AssetLinksHandler' => __DIR__ . '/..' . '/../lib/WellKnown/AssetLinksHandler.php',
         'OCA\\Settings\\WellKnown\\ChangePasswordHandler' => __DIR__ . '/..' . '/../lib/WellKnown/ChangePasswordHandler.php',
         'OCA\\Settings\\WellKnown\\SecurityTxtHandler' => __DIR__ . '/..' . '/../lib/WellKnown/SecurityTxtHandler.php',
     );

apps/settings/data/assetlinks-template.json

@@ -0,0 +1,12 @@
+[
+  {
+    "relation": [
+      "delegate_permission/common.handle_all_urls"
+    ],
+    "target": {
+      "namespace": "android_app",
+      "package_name": "",
+      "sha256_cert_fingerprints": []
+    }
+  }
+]

apps/settings/lib/AppInfo/Application.php

@@ -94,6 +94,7 @@
 use OCA\Settings\SetupChecks\WellKnownUrls;
 use OCA\Settings\SetupChecks\Woff2Loading;
 use OCA\Settings\UserMigration\AccountMigrator;
+use OCA\Settings\WellKnown\AssetLinksHandler;
 use OCA\Settings\WellKnown\ChangePasswordHandler;
 use OCA\Settings\WellKnown\SecurityTxtHandler;
 use OCP\AppFramework\App;
@@ -136,6 +137,7 @@ public function register(IRegistrationContext $context): void {
 		// Register well-known handlers
 		$context->registerWellKnownHandler(SecurityTxtHandler::class);
 		$context->registerWellKnownHandler(ChangePasswordHandler::class);
+		$context->registerWellKnownHandler(AssetLinksHandler::class);
 
 		/**
 		 * Core class wrappers

apps/settings/lib/WellKnown/AssetLinksHandler.php

@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2024 Christopher Ng <[email protected]>
+ *
+ * @author Christopher Ng <[email protected]>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\Settings\WellKnown;
+
+use OCP\AppFramework\Http\JSONResponse;
+use OCP\Http\WellKnown\GenericResponse;
+use OCP\Http\WellKnown\IHandler;
+use OCP\Http\WellKnown\IRequestContext;
+use OCP\Http\WellKnown\IResponse;
+use OCP\IConfig;
+
+class AssetLinksHandler implements IHandler {
+
+	public function __construct(
+		private IConfig $config,
+	) {
+	}
+
+	public function handle(string $service, IRequestContext $context, ?IResponse $previousResponse): ?IResponse {
+		if ($service !== 'assetlinks.json') {
+			return $previousResponse;
+		}
+
+		$data = json_decode(file_get_contents(__DIR__ . '/../../data/assetlinks-template.json'), true);
+		$data[0]['target']['package_name'] = $this->config->getSystemValueString('assetlinks_package_name', 'com.nextcloud.client');
+		$data[0]['target']['sha256_cert_fingerprints'] = $this->config->getSystemValue(
+			'assetlinks_sha256_cert_fingerprints',
+			[
+				'59:BF:BB:8A:5C:17:53:D6:69:AE:C0:D8:CC:D0:DA:82:76:FE:8E:AC:81:A4:45:22:AE:68:0E:A7:74:81:A3:32',
+			],
+		);
+		return new GenericResponse(new JSONResponse($data));
+	}
+}

config/config.sample.php

@@ -1121,6 +1121,24 @@
 	'https://itunes.apple.com/us/app/nextcloud/id1125420102?mt=8',
 'customclient_ios_appid' =>
 		'1125420102',
+
+/**
+ * This configures the package name in assetlinks.json for the Android client.
+ *
+ * Defaults to ``com.nextcloud.client``
+ */
+'assetlinks_package_name' => 'com.nextcloud.client',
+
+/**
+ * This configures the sha256 certificate fingerprints in assetlinks.json for the Android client.
+ *
+ * Defaults to an array with:
+ * - ``59:BF:BB:8A:5C:17:53:D6:69:AE:C0:D8:CC:D0:DA:82:76:FE:8E:AC:81:A4:45:22:AE:68:0E:A7:74:81:A3:32``
+ */
+'assetlinks_sha256_cert_fingerprints' => [
+	'59:BF:BB:8A:5C:17:53:D6:69:AE:C0:D8:CC:D0:DA:82:76:FE:8E:AC:81:A4:45:22:AE:68:0E:A7:74:81:A3:32',
+],
+
 /**
  * Apps
  *