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1 | <?php | |
2 | ||
3 | namespace Wallabag\CoreBundle\Helper; | |
4 | ||
5 | use GuzzleHttp\Client; | |
6 | use GuzzleHttp\Message\Response; | |
7 | use Psr\Log\LoggerInterface; | |
8 | use Symfony\Component\DomCrawler\Crawler; | |
9 | use Symfony\Component\Finder\Finder; | |
10 | use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeExtensionGuesser; | |
11 | ||
12 | class DownloadImages | |
13 | { | |
14 | const REGENERATE_PICTURES_QUALITY = 80; | |
15 | ||
16 | private $client; | |
17 | private $baseFolder; | |
18 | private $logger; | |
19 | private $mimeGuesser; | |
20 | private $wallabagUrl; | |
21 | ||
22 | public function __construct(Client $client, $baseFolder, $wallabagUrl, LoggerInterface $logger) | |
23 | { | |
24 | $this->client = $client; | |
25 | $this->baseFolder = $baseFolder; | |
26 | $this->wallabagUrl = rtrim($wallabagUrl, '/'); | |
27 | $this->logger = $logger; | |
28 | $this->mimeGuesser = new MimeTypeExtensionGuesser(); | |
29 | ||
30 | $this->setFolder(); | |
31 | } | |
32 | ||
33 | /** | |
34 | * Process the html and extract image from it, save them to local and return the updated html. | |
35 | * | |
36 | * @param int $entryId ID of the entry | |
37 | * @param string $html | |
38 | * @param string $url Used as a base path for relative image and folder | |
39 | * | |
40 | * @return string | |
41 | */ | |
42 | public function processHtml($entryId, $html, $url) | |
43 | { | |
44 | $crawler = new Crawler($html); | |
45 | $imagesCrawler = $crawler | |
46 | ->filterXpath('//img'); | |
47 | $imagesUrls = $imagesCrawler | |
48 | ->extract(['src']); | |
49 | $imagesSrcsetUrls = $this->getSrcsetUrls($imagesCrawler); | |
50 | $imagesUrls = array_unique(array_merge($imagesUrls, $imagesSrcsetUrls)); | |
51 | ||
52 | $relativePath = $this->getRelativePath($entryId); | |
53 | ||
54 | // download and save the image to the folder | |
55 | foreach ($imagesUrls as $image) { | |
56 | $imagePath = $this->processSingleImage($entryId, $image, $url, $relativePath); | |
57 | ||
58 | if (false === $imagePath) { | |
59 | continue; | |
60 | } | |
61 | ||
62 | // if image contains "&" and we can't find it in the html it might be because it's encoded as & | |
63 | if (false !== stripos($image, '&') && false === stripos($html, $image)) { | |
64 | $image = str_replace('&', '&', $image); | |
65 | } | |
66 | ||
67 | $html = str_replace($image, $imagePath, $html); | |
68 | } | |
69 | ||
70 | return $html; | |
71 | } | |
72 | ||
73 | /** | |
74 | * Process a single image: | |
75 | * - retrieve it | |
76 | * - re-saved it (for security reason) | |
77 | * - return the new local path. | |
78 | * | |
79 | * @param int $entryId ID of the entry | |
80 | * @param string $imagePath Path to the image to retrieve | |
81 | * @param string $url Url from where the image were found | |
82 | * @param string $relativePath Relative local path to saved the image | |
83 | * | |
84 | * @return string Relative url to access the image from the web | |
85 | */ | |
86 | public function processSingleImage($entryId, $imagePath, $url, $relativePath = null) | |
87 | { | |
88 | if (null === $imagePath) { | |
89 | return false; | |
90 | } | |
91 | ||
92 | if (null === $relativePath) { | |
93 | $relativePath = $this->getRelativePath($entryId); | |
94 | } | |
95 | ||
96 | $this->logger->debug('DownloadImages: working on image: ' . $imagePath); | |
97 | ||
98 | $folderPath = $this->baseFolder . '/' . $relativePath; | |
99 | ||
100 | // build image path | |
101 | $absolutePath = $this->getAbsoluteLink($url, $imagePath); | |
102 | if (false === $absolutePath) { | |
103 | $this->logger->error('DownloadImages: Can not determine the absolute path for that image, skipping.'); | |
104 | ||
105 | return false; | |
106 | } | |
107 | ||
108 | try { | |
109 | $res = $this->client->get($absolutePath); | |
110 | } catch (\Exception $e) { | |
111 | $this->logger->error('DownloadImages: Can not retrieve image, skipping.', ['exception' => $e]); | |
112 | ||
113 | return false; | |
114 | } | |
115 | ||
116 | $ext = $this->getExtensionFromResponse($res, $imagePath); | |
117 | if (false === $res) { | |
118 | return false; | |
119 | } | |
120 | ||
121 | $hashImage = hash('crc32', $absolutePath); | |
122 | $localPath = $folderPath . '/' . $hashImage . '.' . $ext; | |
123 | ||
124 | try { | |
125 | $im = imagecreatefromstring($res->getBody()); | |
126 | } catch (\Exception $e) { | |
127 | $im = false; | |
128 | } | |
129 | ||
130 | if (false === $im) { | |
131 | $this->logger->error('DownloadImages: Error while regenerating image', ['path' => $localPath]); | |
132 | ||
133 | return false; | |
134 | } | |
135 | ||
136 | switch ($ext) { | |
137 | case 'gif': | |
138 | imagegif($im, $localPath); | |
139 | $this->logger->debug('DownloadImages: Re-creating gif'); | |
140 | break; | |
141 | case 'jpeg': | |
142 | case 'jpg': | |
143 | imagejpeg($im, $localPath, self::REGENERATE_PICTURES_QUALITY); | |
144 | $this->logger->debug('DownloadImages: Re-creating jpg'); | |
145 | break; | |
146 | case 'png': | |
147 | imagealphablending($im, false); | |
148 | imagesavealpha($im, true); | |
149 | imagepng($im, $localPath, ceil(self::REGENERATE_PICTURES_QUALITY / 100 * 9)); | |
150 | $this->logger->debug('DownloadImages: Re-creating png'); | |
151 | } | |
152 | ||
153 | imagedestroy($im); | |
154 | ||
155 | return $this->wallabagUrl . '/assets/images/' . $relativePath . '/' . $hashImage . '.' . $ext; | |
156 | } | |
157 | ||
158 | /** | |
159 | * Remove all images for the given entry id. | |
160 | * | |
161 | * @param int $entryId ID of the entry | |
162 | */ | |
163 | public function removeImages($entryId) | |
164 | { | |
165 | $relativePath = $this->getRelativePath($entryId); | |
166 | $folderPath = $this->baseFolder . '/' . $relativePath; | |
167 | ||
168 | $finder = new Finder(); | |
169 | $finder | |
170 | ->files() | |
171 | ->ignoreDotFiles(true) | |
172 | ->in($folderPath); | |
173 | ||
174 | foreach ($finder as $file) { | |
175 | @unlink($file->getRealPath()); | |
176 | } | |
177 | ||
178 | @rmdir($folderPath); | |
179 | } | |
180 | ||
181 | /** | |
182 | * Get images urls from the srcset image attribute. | |
183 | * | |
184 | * @param Crawler $imagesCrawler | |
185 | * | |
186 | * @return array An array of urls | |
187 | */ | |
188 | protected function getSrcsetUrls(Crawler $imagesCrawler) | |
189 | { | |
190 | $urls = []; | |
191 | $iterator = $imagesCrawler | |
192 | ->getIterator(); | |
193 | while ($iterator->valid()) { | |
194 | $srcsetAttribute = $iterator->current()->getAttribute('srcset'); | |
195 | if ('' !== $srcsetAttribute) { | |
196 | $srcset = array_map('trim', explode(',', $srcsetAttribute)); | |
197 | $srcsetUrls = array_map(function ($src) { | |
198 | return explode(' ', $src)[0]; | |
199 | }, $srcset); | |
200 | $urls = array_merge($srcsetUrls, $urls); | |
201 | } | |
202 | $iterator->next(); | |
203 | } | |
204 | ||
205 | return $urls; | |
206 | } | |
207 | ||
208 | /** | |
209 | * Setup base folder where all images are going to be saved. | |
210 | */ | |
211 | private function setFolder() | |
212 | { | |
213 | // if folder doesn't exist, attempt to create one and store the folder name in property $folder | |
214 | if (!file_exists($this->baseFolder)) { | |
215 | mkdir($this->baseFolder, 0755, true); | |
216 | } | |
217 | } | |
218 | ||
219 | /** | |
220 | * Generate the folder where we are going to save images based on the entry url. | |
221 | * | |
222 | * @param int $entryId ID of the entry | |
223 | * | |
224 | * @return string | |
225 | */ | |
226 | private function getRelativePath($entryId) | |
227 | { | |
228 | $hashId = hash('crc32', $entryId); | |
229 | $relativePath = $hashId[0] . '/' . $hashId[1] . '/' . $hashId; | |
230 | $folderPath = $this->baseFolder . '/' . $relativePath; | |
231 | ||
232 | if (!file_exists($folderPath)) { | |
233 | mkdir($folderPath, 0777, true); | |
234 | } | |
235 | ||
236 | $this->logger->debug('DownloadImages: Folder used for that Entry id', ['folder' => $folderPath, 'entryId' => $entryId]); | |
237 | ||
238 | return $relativePath; | |
239 | } | |
240 | ||
241 | /** | |
242 | * Make an $url absolute based on the $base. | |
243 | * | |
244 | * @see Graby->makeAbsoluteStr | |
245 | * | |
246 | * @param string $base Base url | |
247 | * @param string $url Url to make it absolute | |
248 | * | |
249 | * @return false|string | |
250 | */ | |
251 | private function getAbsoluteLink($base, $url) | |
252 | { | |
253 | if (preg_match('!^https?://!i', $url)) { | |
254 | // already absolute | |
255 | return $url; | |
256 | } | |
257 | ||
258 | $base = new \SimplePie_IRI($base); | |
259 | ||
260 | // remove '//' in URL path (causes URLs not to resolve properly) | |
261 | if (isset($base->ipath)) { | |
262 | $base->ipath = preg_replace('!//+!', '/', $base->ipath); | |
263 | } | |
264 | ||
265 | if ($absolute = \SimplePie_IRI::absolutize($base, $url)) { | |
266 | return $absolute->get_uri(); | |
267 | } | |
268 | ||
269 | $this->logger->error('DownloadImages: Can not make an absolute link', ['base' => $base, 'url' => $url]); | |
270 | ||
271 | return false; | |
272 | } | |
273 | ||
274 | /** | |
275 | * Retrieve and validate the extension from the response of the url of the image. | |
276 | * | |
277 | * @param Response $res Guzzle Response | |
278 | * @param string $imagePath Path from the src image from the content (used for log only) | |
279 | * | |
280 | * @return string|false Extension name or false if validation failed | |
281 | */ | |
282 | private function getExtensionFromResponse(Response $res, $imagePath) | |
283 | { | |
284 | $ext = $this->mimeGuesser->guess($res->getHeader('content-type')); | |
285 | $this->logger->debug('DownloadImages: Checking extension', ['ext' => $ext, 'header' => $res->getHeader('content-type')]); | |
286 | ||
287 | // ok header doesn't have the extension, try a different way | |
288 | if (empty($ext)) { | |
289 | $types = [ | |
290 | 'jpeg' => "\xFF\xD8\xFF", | |
291 | 'gif' => 'GIF', | |
292 | 'png' => "\x89\x50\x4e\x47\x0d\x0a", | |
293 | ]; | |
294 | $bytes = substr((string) $res->getBody(), 0, 8); | |
295 | ||
296 | foreach ($types as $type => $header) { | |
297 | if (0 === strpos($bytes, $header)) { | |
298 | $ext = $type; | |
299 | break; | |
300 | } | |
301 | } | |
302 | ||
303 | $this->logger->debug('DownloadImages: Checking extension (alternative)', ['ext' => $ext]); | |
304 | } | |
305 | ||
306 | if (!in_array($ext, ['jpeg', 'jpg', 'gif', 'png'], true)) { | |
307 | $this->logger->error('DownloadImages: Processed image with not allowed extension. Skipping: ' . $imagePath); | |
308 | ||
309 | return false; | |
310 | } | |
311 | ||
312 | return $ext; | |
313 | } | |
314 | } |