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910592b4 AD |
1 | <?php |
2 | class Cache_Starred_Images extends Plugin { | |
3 | ||
4 | private $host; | |
5 | private $cache_dir; | |
6 | ||
7 | function about() { | |
8 | return array(1.0, | |
9 | "Automatically cache images in Starred articles", | |
10 | "fox", | |
11 | true); | |
12 | } | |
13 | ||
14 | function init($host) { | |
15 | $this->host = $host; | |
16 | ||
17 | $this->cache_dir = CACHE_DIR . "/starred-images/"; | |
18 | ||
19 | if (!is_dir($this->cache_dir)) { | |
20 | mkdir($this->cache_dir); | |
21 | } | |
22 | ||
23 | if (is_dir($this->cache_dir)) { | |
f5967cf8 AD |
24 | |
25 | if (!is_writable($this->cache_dir)) | |
26 | chmod($this->cache_dir, 0777); | |
910592b4 AD |
27 | |
28 | if (is_writable($this->cache_dir)) { | |
29 | $host->add_hook($host::HOOK_UPDATE_TASK, $this); | |
4e5ddeaf | 30 | $host->add_hook($host::HOOK_HOUSE_KEEPING, $this); |
910592b4 AD |
31 | $host->add_hook($host::HOOK_SANITIZE, $this); |
32 | } else { | |
33 | user_error("Starred cache directory is not writable.", E_USER_WARNING); | |
34 | } | |
35 | ||
36 | } else { | |
37 | user_error("Unable to create starred cache directory.", E_USER_WARNING); | |
38 | } | |
39 | } | |
40 | ||
41 | function image() { | |
ae3851b1 AD |
42 | ob_end_clean(); |
43 | ||
910592b4 AD |
44 | $hash = basename($_REQUEST["hash"]); |
45 | ||
46 | if ($hash) { | |
47 | ||
48 | $filename = $this->cache_dir . "/" . $hash . '.png'; | |
49 | ||
50 | if (file_exists($filename)) { | |
51 | /* See if we can use X-Sendfile */ | |
52 | $xsendfile = false; | |
53 | if (function_exists('apache_get_modules') && | |
54 | array_search('mod_xsendfile', apache_get_modules())) | |
55 | $xsendfile = true; | |
56 | ||
57 | if ($xsendfile) { | |
58 | header("X-Sendfile: $filename"); | |
59 | header("Content-type: application/octet-stream"); | |
60 | header('Content-Disposition: attachment; filename="' . basename($filename) . '"'); | |
61 | } else { | |
62 | header("Content-type: image/png"); | |
63 | $stamp = gmdate("D, d M Y H:i:s", filemtime($filename)). " GMT"; | |
64 | header("Last-Modified: $stamp", true); | |
910592b4 AD |
65 | readfile($filename); |
66 | } | |
67 | } else { | |
68 | header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found"); | |
69 | echo "File not found."; | |
70 | } | |
71 | } | |
72 | } | |
73 | ||
4e5ddeaf AD |
74 | function hook_house_keeping() { |
75 | $files = glob($this->cache_dir . "/*.png"); | |
76 | ||
77 | $last_article_id = 0; | |
78 | $article_exists = 1; | |
79 | ||
80 | foreach ($files as $file) { | |
81 | list ($article_id, $hash) = explode("-", basename($file)); | |
82 | ||
83 | if ($article_id != $last_article_id) { | |
84 | $last_article_id = $article_id; | |
85 | $article_id = db_escape_string($article_id); | |
86 | ||
87 | $result = db_query("SELECT id FROM ttrss_entries WHERE id = " . $article_id); | |
88 | ||
89 | $article_exists = db_num_rows($result) > 0; | |
90 | } | |
91 | ||
92 | if (!$article_exists) { | |
93 | unlink($file); | |
94 | } | |
95 | } | |
96 | } | |
97 | ||
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98 | function hook_sanitize($doc, $site_url, $allowed_elements, $disallowed_attributes, $article_id) { |
99 | $xpath = new DOMXpath($doc); | |
100 | ||
101 | if ($article_id) { | |
102 | $entries = $xpath->query('(//img[@src])'); | |
103 | ||
104 | foreach ($entries as $entry) { | |
105 | if ($entry->hasAttribute('src')) { | |
106 | $src = rewrite_relative_url($site_url, $entry->getAttribute('src')); | |
107 | ||
108 | $local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . ".png"; | |
109 | ||
110 | if (file_exists($local_filename)) { | |
111 | $entry->setAttribute("src", get_self_url_prefix() . | |
112 | "/backend.php?op=pluginhandler&plugin=cache_starred_images&method=image&hash=" . | |
113 | $article_id . "-" . sha1($src)); | |
114 | } | |
115 | ||
116 | } | |
117 | } | |
118 | } | |
119 | ||
120 | return $doc; | |
121 | } | |
122 | ||
123 | function hook_update_task() { | |
910592b4 AD |
124 | $result = db_query("SELECT content, ttrss_user_entries.owner_uid, link, site_url, ttrss_entries.id, plugin_data |
125 | FROM ttrss_entries, ttrss_user_entries LEFT JOIN ttrss_feeds ON | |
126 | (ttrss_user_entries.feed_id = ttrss_feeds.id) | |
127 | WHERE ref_id = ttrss_entries.id AND | |
128 | marked = true AND | |
129 | UPPER(content) LIKE '%<IMG%' AND | |
130 | site_url != '' AND | |
131 | plugin_data NOT LIKE '%starred_cache_images%' | |
132 | ORDER BY ".sql_random_function()." LIMIT 100"); | |
133 | ||
134 | ||
135 | while ($line = db_fetch_assoc($result)) { | |
136 | if ($line["site_url"]) { | |
137 | $success = $this->cache_article_images($line["content"], $line["site_url"], $line["owner_uid"], $line["id"]); | |
138 | ||
139 | if ($success) { | |
140 | $plugin_data = db_escape_string("starred_cache_images,${line['owner_uid']}:" . $line["plugin_data"]); | |
141 | ||
142 | db_query("UPDATE ttrss_entries SET plugin_data = '$plugin_data' WHERE id = " . $line["id"]); | |
143 | } | |
144 | } | |
145 | } | |
146 | } | |
147 | ||
148 | function cache_article_images($content, $site_url, $owner_uid, $article_id) { | |
149 | libxml_use_internal_errors(true); | |
150 | ||
151 | $charset_hack = '<head> | |
152 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> | |
153 | </head>'; | |
154 | ||
155 | $doc = new DOMDocument(); | |
156 | $doc->loadHTML($charset_hack . $content); | |
157 | $xpath = new DOMXPath($doc); | |
158 | ||
159 | $entries = $xpath->query('(//img[@src])'); | |
160 | ||
161 | $success = false; | |
162 | $has_images = false; | |
163 | ||
164 | foreach ($entries as $entry) { | |
165 | if ($entry->hasAttribute('src')) { | |
166 | $has_images = true; | |
167 | $src = rewrite_relative_url($site_url, $entry->getAttribute('src')); | |
168 | ||
169 | $local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . ".png"; | |
170 | ||
171 | //_debug("cache_images: downloading: $src to $local_filename"); | |
172 | ||
173 | if (!file_exists($local_filename)) { | |
174 | $file_content = fetch_file_contents($src); | |
175 | ||
176 | if ($file_content && strlen($file_content) > 0) { | |
177 | file_put_contents($local_filename, $file_content); | |
178 | $success = true; | |
179 | } | |
180 | } else { | |
181 | $success = true; | |
182 | } | |
183 | } | |
184 | } | |
185 | ||
186 | return $success || !$has_images; | |
187 | } | |
188 | ||
189 | function api_version() { | |
190 | return 2; | |
191 | } | |
192 | } | |
193 | ?> |