plugins/cache_starred_images/init.php

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