privacy_image_cache/privacy_image_cache.php

   1 <?php
   2
   3 /**
   4  * Name: Privacy Image Cache
   5  * Version: 0.1
   6  * Author: Tobias Hößl <https://github.com/CatoTH/>
   7  */
   8
   9 define("PRIVACY_IMAGE_CACHE_DEFAULT_TIME", 86400); // 1 Day
  10
  11 require_once('include/security.php');
  12
  13 function privacy_image_cache_install() {
  14     register_hook('prepare_body', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_prepare_body_hook');
  15  //   register_hook('bbcode',       'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_bbcode_hook');
  16     register_hook('display_item', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_display_item_hook');
  17     register_hook('ping_xmlize',  'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_ping_xmlize_hook');
  18     register_hook('cron',         'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_cron');
  19 }
  20
  21
  22 function privacy_image_cache_uninstall() {
  23     unregister_hook('prepare_body', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_prepare_body_hook');
  24     unregister_hook('bbcode',       'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_bbcode_hook');
  25     unregister_hook('display_item', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_display_item_hook');
  26     unregister_hook('ping_xmlize',  'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_ping_xmlize_hook');
  27     unregister_hook('cron',         'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_cron');
  28 }
  29
  30
  31 function privacy_image_cache_module() {}
  32
  33
  34 function privacy_image_cache_init() {
  35         global $a;
  36
  37         if(function_exists('header_remove')) {
  38                 header_remove('Pragma');
  39                 header_remove('pragma');
  40         }
  41
  42         $urlhash = 'pic:' . sha1($_REQUEST['url']);
  43         // Double encoded url - happens with Diaspora
  44         $urlhash2 = 'pic:' . sha1(urldecode($_REQUEST['url']));
  45
  46         $cache = get_config('system','itemcache');
  47         if (($cache != '') and is_dir($cache)) {
  48                 $cachefile = $cache."/".hash("md5", $urlhash);
  49                 if (file_exists($cachefile)) {
  50                         $img_str = file_get_contents($cachefile);
  51
  52                         $mime = image_type_to_mime_type(exif_imagetype($cachefile));
  53
  54                         header("Content-type: $mime");
  55                         header("Expires: " . gmdate("D, d M Y H:i:s", time() + (3600*24)) . " GMT");
  56                         header("Cache-Control: max-age=" . (3600*24));
  57
  58                         echo $img_str;
  59
  60                         killme();
  61                 }
  62         }
  63
  64         $r = q("SELECT * FROM `photo` WHERE `resource-id` in ('%s', '%s') LIMIT 1", $urlhash, $urlhash2);
  65         if (count($r)) {
  66                 $img_str = $r[0]['data'];
  67                 $mime = $r[0]["desc"];
  68                 if ($mime == "") $mime = "image/jpeg";
  69         } else {
  70                 require_once("Photo.php");
  71
  72                 // It shouldn't happen but it does - spaces in URL
  73                 $_REQUEST['url'] = str_replace(" ", "+", $_REQUEST['url']);
  74
  75                 $img_str = fetch_url($_REQUEST['url'],true);
  76
  77                 $tempfile = tempnam("", "cache");
  78                 file_put_contents($tempfile, $img_str);
  79                 $mime = image_type_to_mime_type(exif_imagetype($tempfile));
  80                 unlink($tempfile);
  81
  82                 // If there is an error then return a blank image
  83                 if ((substr($a->get_curl_code(), 0, 1) == "4") or (!$img_str)) {
  84                         $img_str = file_get_contents("images/blank.png");
  85                         $mime = "image/png";
  86                 //} else if (substr($img_str, 0, 6) == "GIF89a") {
  87                 } else if ($mime != "image/jpeg") {
  88                         $image = @imagecreatefromstring($img_str);
  89
  90                         if($image === FALSE) die();
  91
  92                         q("INSERT INTO `photo`
  93                         ( `uid`, `contact-id`, `guid`, `resource-id`, `created`, `edited`, `filename`, `album`, `height`, `width`, `desc`, `data`, `scale`, `profile`, `allow_cid`, `allow_gid`, `deny_cid`, `deny_gid` )
  94                         VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s', '%s' )",
  95                                 0, 0, get_guid(), dbesc($urlhash),
  96                                 dbesc(datetime_convert()),
  97                                 dbesc(datetime_convert()),
  98                                 dbesc(basename(dbesc($_REQUEST["url"]))),
  99                                 dbesc(''),
 100                                 intval(imagesy($image)),
 101                                 intval(imagesx($image)),
 102                                 $mime,
 103                                 dbesc($img_str),
 104                                 100,
 105                                 intval(0),
 106                                 dbesc(''), dbesc(''), dbesc(''), dbesc('')
 107                         );
 108
 109                 } else {
 110                         $img = new Photo($img_str);
 111                         if($img->is_valid()) {
 112                                 $img->store(0, 0, $urlhash, $_REQUEST['url'], '', 100);
 113                                 $img_str = $img->imageString();
 114                         }
 115                         $mime = "image/jpeg";
 116                 }
 117         }
 118
 119         // Writing in cachefile
 120         if (isset($cachefile) && $cachefile != '')
 121                 file_put_contents($cachefile, $img_str);
 122
 123         header("Content-type: $mime");
 124         header("Expires: " . gmdate("D, d M Y H:i:s", time() + (3600*24)) . " GMT");
 125         header("Cache-Control: max-age=" . (3600*24));
 126
 127         echo $img_str;
 128
 129         killme();
 130 }
 131
 132 /**
 133  * @param $url string
 134  * @return boolean
 135  */
 136 function privacy_image_cache_is_local_image($url) {
 137     if ($url[0] == '/') return true;
 138         if (strtolower(substr($url, 0, 5)) == "data:") return true;
 139
 140         // links normalised - bug #431
 141     $baseurl = normalise_link(get_app()->get_baseurl());
 142         $url = normalise_link($url);
 143     return (substr($url, 0, strlen($baseurl)) == $baseurl);
 144 }
 145
 146 /**
 147  * @param array $matches
 148  * @return string
 149  */
 150 function privacy_image_cache_img_cb($matches) {
 151         // following line changed per bug #431
 152         if (privacy_image_cache_is_local_image($matches[2]))
 153                 return $matches[1] . $matches[2] . $matches[3];
 154
 155         return $matches[1] . get_app()->get_baseurl() . "/privacy_image_cache/?url=" . addslashes(rawurlencode(htmlspecialchars_decode($matches[2]))) . $matches[3];
 156 }
 157
 158 /**
 159  * @param App $a
 160  * @param string $o
 161  */
 162 function privacy_image_cache_prepare_body_hook(&$a, &$o) {
 163         $o["html"] = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o["html"]);
 164 }
 165
 166 /**
 167  * @param App $a
 168  * @param string $o
 169  * Function disabled because the plugin moved
 170  */
 171 function privacy_image_cache_bbcode_hook(&$a, &$o) {
 172         //$o = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o);
 173 }
 174
 175
 176 /**
 177  * @param App $a
 178  * @param string $o
 179  */
 180 function privacy_image_cache_display_item_hook(&$a, &$o) {
 181     if (isset($o["output"])) {
 182         if (isset($o["output"]["thumb"]) && !privacy_image_cache_is_local_image($o["output"]["thumb"]))
 183             $o["output"]["thumb"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["thumb"])));
 184         if (isset($o["output"]["author-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["author-avatar"]))
 185             $o["output"]["author-avatar"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["author-avatar"])));
 186     }
 187 }
 188
 189
 190 /**
 191  * @param App $a
 192  * @param string $o
 193  */
 194 function privacy_image_cache_ping_xmlize_hook(&$a, &$o) {
 195     if ($o["photo"] != "" && !privacy_image_cache_is_local_image($o["photo"]))
 196         $o["photo"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["photo"])));
 197 }
 198
 199
 200 /**
 201  * @param App $a
 202  * @param null|object $b
 203  */
 204 function privacy_image_cache_cron(&$a = null, &$b = null) {
 205     $cachetime = get_config('privacy_image_cache','cache_time');
 206     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 207
 208     $last = get_config('pi_cache','last_delete');
 209     $time = time();
 210     if ($time < ($last + 3600)) return;
 211
 212     logger("Purging old Cache of the Privacy Image Cache", LOGGER_DEBUG);
 213     q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%" AND `created` < NOW() - INTERVAL %d SECOND', $cachetime);
 214     set_config('pi_cache', 'last_delete', $time);
 215 }
 216
 217
 218
 219
 220 /**
 221  * @param App $a
 222  * @param null|object $o
 223  */
 224 function privacy_image_cache_plugin_admin(&$a, &$o){
 225
 226
 227     $o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("picsave") . '">';
 228
 229     $cachetime = get_config('privacy_image_cache','cache_time');
 230     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 231     $cachetime_h = Ceil($cachetime / 3600);
 232
 233     $o .= '<label for="pic_cachetime">' . t('Lifetime of the cache (in hours)') . '</label>
 234         <input id="pic_cachetime" name="cachetime" type="text" value="' . escape_tags($cachetime_h) . '"><br style="clear: both;">';
 235
 236     $o .= '<input type="submit" name="save" value="' . t('Save') . '">';
 237
 238     $o .= '<h4>' . t('Cache Statistics') . '</h4>';
 239
 240     $num = q('SELECT COUNT(*) num, SUM(LENGTH(data)) size FROM `photo` WHERE `uid`=0 AND `contact-id`=0 AND `resource-id` LIKE "pic:%%"');
 241     $o .= '<label for="statictics_num">' . t('Number of items') . '</label><input style="color: gray;" id="statistics_num" disabled value="' . escape_tags($num[0]['num']) . '"><br style="clear: both;">';
 242     $size = Ceil($num[0]['size'] / (1024 * 1024));
 243     $o .= '<label for="statictics_size">' . t('Size of the cache') . '</label><input style="color: gray;" id="statistics_size" disabled value="' . $size . ' MB"><br style="clear: both;">';
 244
 245     $o .= '<input type="submit" name="delete_all" value="' . t('Delete the whole cache') . '">';
 246 }
 247
 248
 249 /**
 250  * @param App $a
 251  * @param null|object $o
 252  */
 253 function privacy_image_cache_plugin_admin_post(&$a = null, &$o = null){
 254     check_form_security_token_redirectOnErr('/admin/plugins/privacy_image_cache', 'picsave');
 255
 256     if (isset($_REQUEST['save'])) {
 257         $cachetime_h = IntVal($_REQUEST['cachetime']);
 258         if ($cachetime_h < 1) $cachetime_h = 1;
 259         set_config('privacy_image_cache','cache_time', $cachetime_h * 3600);
 260     }
 261     if (isset($_REQUEST['delete_all'])) {
 262         q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%"');
 263     }
 264 }