mirror of https://github.com/nextcloud/bookmarks
149 lines
3.4 KiB
PHP
149 lines
3.4 KiB
PHP
<?php
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/*
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* Copyright (c) 2020-2024. The Nextcloud Bookmarks contributors.
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*
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* This file is licensed under the Affero General Public License version 3 or later. See the COPYING file.
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*/
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namespace OCA\Bookmarks\Service;
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use Exception;
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use OCA\Bookmarks\Contract\IBookmarkPreviewer;
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use OCA\Bookmarks\Contract\IImage;
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use OCA\Bookmarks\Db\Bookmark;
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use OCA\Bookmarks\Image;
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use OCP\Files\NotFoundException;
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use OCP\Files\NotPermittedException;
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use OCP\Http\Client\IClient;
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use OCP\Http\Client\IClientService;
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use Psr\Log\LoggerInterface;
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class FaviconPreviewer implements IBookmarkPreviewer {
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public const CACHE_TTL = 4 * 4 * 7 * 24 * 60 * 60; // cache for one month
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public const HTTP_TIMEOUT = 10 * 1000;
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public const CACHE_PREFIX = 'bookmarks.FaviconPreviewer';
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/**
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* @var FileCache
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*/
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private $cache;
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/**
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* @var LinkExplorer
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*/
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private $linkExplorer;
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/**
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* @var LoggerInterface
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*/
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private $logger;
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/**
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* @var IClient
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*/
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private $client;
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/**
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* @var \OCP\IConfig
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*/
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private $config;
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/**
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* @var string
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*/
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private $enabled;
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public function __construct(FileCache $cache, LinkExplorer $linkExplorer, LoggerInterface $logger, IClientService $clientService, \OCP\IConfig $config) {
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$this->cache = $cache;
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$this->linkExplorer = $linkExplorer;
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$this->logger = $logger;
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$this->client = $clientService->newClient();
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$this->enabled = $config->getAppValue('bookmarks', 'privacy.enableScraping', 'false');
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}
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/**
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* @param Bookmark $bookmark
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*
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* @return Image|null
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*/
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public function getImage($bookmark): ?IImage {
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if ($this->enabled === 'false') {
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return null;
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}
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if (!isset($bookmark)) {
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return null;
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}
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if (!$bookmark->isWebLink()) {
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return null;
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}
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$key = self::CACHE_PREFIX . '-' . md5($bookmark->getUrl());
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// Try cache first
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try {
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if ($image = $this->cache->get($key)) {
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if ($image === 'null') {
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return null;
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}
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return Image::deserialize($image);
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}
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} catch (NotFoundException $e) {
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} catch (NotPermittedException $e) {
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}
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$url = $bookmark->getUrl();
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$site = $this->scrapeUrl($url);
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if (isset($site['favicon'])) {
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$image = $this->fetchImage($site['favicon']);
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if ($image !== null) {
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$this->cache->set($key, $image->serialize(), self::CACHE_TTL);
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return $image;
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}
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}
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$url_parts = parse_url($bookmark->getUrl());
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if (isset($url_parts['scheme'], $url_parts['host'])) {
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$image = $this->fetchImage(
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$url_parts['scheme'] . '://' . $url_parts['host'] . '/favicon.ico'
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);
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if ($image !== null) {
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$this->cache->set($key, $image->serialize(), self::CACHE_TTL);
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return $image;
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}
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}
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$this->cache->set($key, 'null', self::CACHE_TTL);
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return null;
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}
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public function scrapeUrl($url): array {
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return $this->linkExplorer->get($url);
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}
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/**
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* @param $url
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* @return Image|null
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*/
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protected function fetchImage(string $url): ?Image {
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try {
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$response = $this->client->get($url, ['timeout' => self::HTTP_TIMEOUT]);
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} catch (Exception $e) {
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$this->logger->debug($e->getMessage(), ['app' => 'bookmarks']);
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return null;
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}
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$body = $response->getBody();
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$contentType = $response->getHeader('Content-Type');
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// Some HTPP Error occured :/
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if (200 !== $response->getStatusCode()) {
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return null;
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}
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// It's not actually an image, doh.
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if (!isset($contentType) || stripos($contentType, 'image') !== 0) {
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return null;
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}
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return new Image($contentType, $body);
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}
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}
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