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1 | <?php | |
2 | /** | |
3 | * wallabag, self hostable application allowing you to not miss any content anymore | |
4 | * | |
5 | * @category wallabag | |
6 | * @author Nicolas LÅ“uillet <nicolas@loeuillet.org> | |
7 | * @copyright 2013 | |
8 | * @license http://opensource.org/licenses/MIT see COPYING file | |
9 | */ | |
10 | ||
11 | namespace Wallabag\Wallabag; | |
12 | ||
13 | final class Picture | |
14 | { | |
15 | /** | |
16 | * Changing pictures URL in article content | |
17 | */ | |
18 | public static function filterPicture($content, $url, $id) | |
19 | { | |
20 | $matches = array(); | |
21 | $processing_pictures = array(); // list of processing image to avoid processing the same pictures twice | |
22 | preg_match_all('#<\s*(img)[^>]+src="([^"]*)"[^>]*>#Si', $content, $matches, PREG_SET_ORDER); | |
23 | foreach($matches as $i => $link) { | |
24 | $link[1] = trim($link[1]); | |
25 | if (!preg_match('#^(([a-z]+://)|(\#))#', $link[1])) { | |
26 | $absolute_path = self::_getAbsoluteLink($link[2], $url); | |
27 | $filename = basename(parse_url($absolute_path, PHP_URL_PATH)); | |
28 | $directory = self::_createAssetsDirectory($id); | |
29 | $fullpath = $directory . '/' . $filename; | |
30 | ||
31 | if (in_array($absolute_path, $processing_pictures) === true) { | |
32 | // replace picture's URL only if processing is OK : already processing -> go to next picture | |
33 | continue; | |
34 | } | |
35 | ||
36 | if (self::_downloadPictures($absolute_path, $fullpath) === true) { | |
37 | $content = str_replace($matches[$i][2], Tools::getPocheUrl() . $fullpath, $content); | |
38 | } | |
39 | ||
40 | $processing_pictures[] = $absolute_path; | |
41 | } | |
42 | } | |
43 | ||
44 | return $content; | |
45 | } | |
46 | ||
47 | /** | |
48 | * Get absolute URL | |
49 | */ | |
50 | private static function _getAbsoluteLink($relativeLink, $url) | |
51 | { | |
52 | /* return if already absolute URL */ | |
53 | if (parse_url($relativeLink, PHP_URL_SCHEME) != '') return $relativeLink; | |
54 | ||
55 | /* queries and anchors */ | |
56 | if ($relativeLink[0]=='#' || $relativeLink[0]=='?') return $url . $relativeLink; | |
57 | ||
58 | /* parse base URL and convert to local variables: | |
59 | $scheme, $host, $path */ | |
60 | extract(parse_url($url)); | |
61 | ||
62 | /* remove non-directory element from path */ | |
63 | $path = preg_replace('#/[^/]*$#', '', $path); | |
64 | ||
65 | /* destroy path if relative url points to root */ | |
66 | if ($relativeLink[0] == '/') $path = ''; | |
67 | ||
68 | /* dirty absolute URL */ | |
69 | $abs = $host . $path . '/' . $relativeLink; | |
70 | ||
71 | /* replace '//' or '/./' or '/foo/../' with '/' */ | |
72 | $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#'); | |
73 | for($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {} | |
74 | ||
75 | /* absolute URL is ready! */ | |
76 | return $scheme.'://'.$abs; | |
77 | } | |
78 | ||
79 | /** | |
80 | * Downloading pictures | |
81 | * | |
82 | * @return bool true if the download and processing is OK, false else | |
83 | */ | |
84 | private static function _downloadPictures($absolute_path, $fullpath) | |
85 | { | |
86 | $rawdata = Tools::getFile($absolute_path); | |
87 | $fullpath = urldecode($fullpath); | |
88 | ||
89 | if(file_exists($fullpath)) { | |
90 | unlink($fullpath); | |
91 | } | |
92 | ||
93 | // check extension | |
94 | $file_ext = strrchr($fullpath, '.'); | |
95 | $whitelist = array(".jpg",".jpeg",".gif",".png"); | |
96 | if (!(in_array($file_ext, $whitelist))) { | |
97 | Tools::logm('processed image with not allowed extension. Skipping ' . $fullpath); | |
98 | return false; | |
99 | } | |
100 | ||
101 | // check headers | |
102 | $imageinfo = getimagesize($absolute_path); | |
103 | if ($imageinfo['mime'] != 'image/gif' && $imageinfo['mime'] != 'image/jpeg'&& $imageinfo['mime'] != 'image/jpg'&& $imageinfo['mime'] != 'image/png') { | |
104 | Tools::logm('processed image with bad header. Skipping ' . $fullpath); | |
105 | return false; | |
106 | } | |
107 | ||
108 | // regenerate image | |
109 | $im = imagecreatefromstring($rawdata); | |
110 | if ($im === false) { | |
111 | Tools::logm('error while regenerating image ' . $fullpath); | |
112 | return false; | |
113 | } | |
114 | ||
115 | switch ($imageinfo['mime']) { | |
116 | case 'image/gif': | |
117 | $result = imagegif($im, $fullpath); | |
118 | break; | |
119 | case 'image/jpeg': | |
120 | case 'image/jpg': | |
121 | $result = imagejpeg($im, $fullpath, REGENERATE_PICTURES_QUALITY); | |
122 | break; | |
123 | case 'image/png': | |
124 | $result = imagepng($im, $fullpath, ceil(REGENERATE_PICTURES_QUALITY / 100 * 9)); | |
125 | break; | |
126 | } | |
127 | imagedestroy($im); | |
128 | ||
129 | return $result; | |
130 | } | |
131 | ||
132 | /** | |
133 | * Create a directory for an article | |
134 | * | |
135 | * @param $id ID of the article | |
136 | * @return string | |
137 | */ | |
138 | private static function _createAssetsDirectory($id) | |
139 | { | |
140 | $assets_path = ABS_PATH; | |
141 | if (!is_dir($assets_path)) { | |
142 | mkdir($assets_path, 0715); | |
143 | } | |
144 | ||
145 | $article_directory = $assets_path . $id; | |
146 | if (!is_dir($article_directory)) { | |
147 | mkdir($article_directory, 0715); | |
148 | } | |
149 | ||
150 | return $article_directory; | |
151 | } | |
152 | ||
153 | /** | |
154 | * Remove the directory | |
155 | * | |
156 | * @param $directory | |
157 | * @return bool | |
158 | */ | |
159 | public static function removeDirectory($directory) | |
160 | { | |
161 | if (is_dir($directory)) { | |
162 | $files = array_diff(scandir($directory), array('.','..')); | |
163 | foreach ($files as $file) { | |
164 | (is_dir("$directory/$file")) ? self::removeDirectory("$directory/$file") : unlink("$directory/$file"); | |
165 | } | |
166 | return rmdir($directory); | |
167 | } | |
168 | } | |
169 | } |