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