fix(avatar): Use Nextcloud HTTP client for favicons

lib/AppInfo/Application.php

@@ -56,6 +56,7 @@
 use OCA\Mail\Provider\MailProvider;
 use OCA\Mail\Search\FilteringProvider;
 use OCA\Mail\Service\Attachment\AttachmentService;
+use OCA\Mail\Service\Avatar\FaviconDataAccess;
 use OCA\Mail\Service\AvatarService;
 use OCA\Mail\Service\DkimService;
 use OCA\Mail\Service\DkimValidator;
@@ -64,6 +65,7 @@
 use OCA\Mail\Service\Search\MailSearch;
 use OCA\Mail\Service\TrustedSenderService;
 use OCA\Mail\Service\UserPreferenceService;
+use OCA\Mail\Vendor\Favicon\Favicon;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
@@ -97,6 +99,13 @@
 
 			return $userContainer->getUserFolder($uid);
 		});
+		$context->registerService(Favicon::class, function (ContainerInterface $c) {
+			$favicon = new Favicon();
+			$favicon->setDataAccess(
+				$c->get(FaviconDataAccess::class),
+			);
+			return $favicon;
+		});
 
 		$context->registerServiceAlias(IAvatarService::class, AvatarService::class);
 		$context->registerServiceAlias(IAttachmentService::class, AttachmentService::class);

lib/Service/Avatar/FaviconDataAccess.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+/*
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace OCA\Mail\Service\Avatar;
+
+use Exception;
+use OCA\Mail\Vendor\Favicon\DataAccess;
+use OCP\Http\Client\IClientService;
+
+class FaviconDataAccess extends DataAccess {
+
+	public function __construct(
+		private IClientService $clientService,
+	) {
+	}
+
+	public function retrieveUrl($url) {
+		$client = $this->clientService->newClient();
+		try {
+			$response = $client->get($url);
+		} catch (Exception $e) {
+			// Ignore any error, like the parent method
+			return false;
+		}
+		return $response->getBody();
+	}
+
+	public function retrieveHeader($url) {
+		$client = $this->clientService->newClient();
+		try {
+			$response = $client->get($url, [
+				'allow_redirects' => [
+					'max' => 1,
+				],
+			]);
+		} catch (Exception $e) {
+			// Ignore any error, like the parent method
+			return false;
+		}
+		// Build the data structure get_headers returns. The status reason
+		// and protocol are inaccurate, but the favicon lib will only extract
+		// the status code.
+		return [
+			0 => 'HTTP/1.1 ' . $response->getStatusCode() . ' FOO',
+			...array_change_key_case($response->getHeaders()),
+		];
+	}
+
+}

tests/Unit/Service/Avatar/FaviconDataAccessTest.php

@@ -0,0 +1,80 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace OCA\Mail\Service\Avatar;
+
+use ChristophWurst\Nextcloud\Testing\TestCase;
+use OCP\Http\Client\IClient;
+use OCP\Http\Client\IClientService;
+use OCP\Http\Client\IResponse;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class FaviconDataAccessTest extends TestCase {
+
+	private IClientService|MockObject $clientService;
+	private FaviconDataAccess $dataAccess;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->clientService = $this->createMock(IClientService::class);
+
+		$this->dataAccess = new FaviconDataAccess(
+			$this->clientService,
+		);
+	}
+
+	public function testRetrieveUrl() {
+		$client = $this->createMock(IClient::class);
+		$this->clientService->expects(self::once())
+			->method('newClient')
+			->willReturn($client);
+		$response = $this->createMock(IResponse::class);
+		$client->expects(self::once())
+			->method('get')
+			->with('https://localhost/favicon.ico', self::anything())
+			->willReturn($response);
+		$response->method('getBody')
+			->willReturn('html');
+
+		$body = $this->dataAccess->retrieveUrl('https://localhost/favicon.ico');
+
+		self::assertNotNull($body);
+		self::assertSame('html', $body);
+	}
+
+	public function testRetrieveHeader() {
+		$client = $this->createMock(IClient::class);
+		$this->clientService->expects(self::once())
+			->method('newClient')
+			->willReturn($client);
+		$response = $this->createMock(IResponse::class);
+		$client->expects(self::once())
+			->method('get')
+			->with('https://localhost/favicon.ico', self::anything())
+			->willReturn($response);
+		$response->method('getStatusCode')
+			->willReturn(200);
+		$response->method('getHeaders')
+			->willReturn([
+				'Content-Type' => 'image/png',
+			]);
+
+		$headers = $this->dataAccess->retrieveHeader('https://localhost/favicon.ico');
+
+		self::assertIsArray($headers);
+		self::assertSame(
+			[
+				0 => 'HTTP/1.1 200 FOO',
+				'content-type' => 'image/png',
+			],
+			$headers,
+		);
+	}
+}