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, $_SERVER;
  36
  37         if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
  38                 header('HTTP/1.1 304 Not Modified');
  39                 header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
  40                 header('Etag: '.$_SERVER['HTTP_IF_NONE_MATCH']);
  41                 header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
  42                 header("Cache-Control: max-age=31536000");
  43                 if(function_exists('header_remove')) {
  44                         header_remove('Last-Modified');
  45                         header_remove('Expires');
  46                         header_remove('Cache-Control');
  47                 }
  48                 exit;
  49         }
  50
  51         if ($a->config["system"]["db_log"] != "")
  52                 $stamp1 = microtime(true);
  53
  54         if(function_exists('header_remove')) {
  55                 header_remove('Pragma');
  56                 header_remove('pragma');
  57         }
  58
  59         $urlhash = 'pic:' . sha1($_REQUEST['url']);
  60         // Double encoded url - happens with Diaspora
  61         $urlhash2 = 'pic:' . sha1(urldecode($_REQUEST['url']));
  62
  63         $cachefile = get_cachefile(hash("md5", $_REQUEST['url']));
  64         if ($cachefile != '') {
  65                 if (file_exists($cachefile)) {
  66                         $img_str = file_get_contents($cachefile);
  67
  68                         $mime = image_type_to_mime_type(exif_imagetype($cachefile));
  69
  70                         header("Content-type: $mime");
  71                         header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
  72                         header('Etag: "'.md5($img_str).'"');
  73                         header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
  74                         header("Cache-Control: max-age=31536000");
  75
  76                         echo $img_str;
  77
  78                         if ($a->config["system"]["db_log"] != "") {
  79                                 $stamp2 = microtime(true);
  80                                 $duration = round($stamp2-$stamp1, 3);
  81                                 if ($duration > $a->config["system"]["db_loglimit"])
  82                                         @file_put_contents($a->config["system"]["db_log"], $duration."\t".strlen($img_str)."\t".$_REQUEST['url']."\n", FILE_APPEND);
  83                         }
  84
  85                         killme();
  86                 }
  87         }
  88
  89         require_once("Photo.php");
  90
  91         $r = q("SELECT * FROM `photo` WHERE `resource-id` in ('%s', '%s') LIMIT 1", $urlhash, $urlhash2);
  92         if (count($r)) {
  93                 $img_str = $r[0]['data'];
  94                 $mime = $r[0]["desc"];
  95                 if ($mime == "") $mime = "image/jpeg";
  96
  97         } else {
  98                 // It shouldn't happen but it does - spaces in URL
  99                 $_REQUEST['url'] = str_replace(" ", "+", $_REQUEST['url']);
 100
 101                 $img_str = fetch_url($_REQUEST['url'],true);
 102
 103                 $tempfile = tempnam("", "cache");
 104                 file_put_contents($tempfile, $img_str);
 105                 $mime = image_type_to_mime_type(exif_imagetype($tempfile));
 106                 unlink($tempfile);
 107
 108                 // If there is an error then return a blank image
 109                 if ((substr($a->get_curl_code(), 0, 1) == "4") or (!$img_str)) {
 110                         $img_str = file_get_contents("images/blank.png");
 111                         $mime = "image/png";
 112                         $cachefile = ""; // Clear the cachefile so that the dummy isn't stored
 113                         $img = new Photo($img_str);
 114                         if($img->is_valid()) {
 115                                 $img->scaleImage(1);
 116                                 $img_str = $img->imageString();
 117                         }
 118                 //} else if (substr($img_str, 0, 6) == "GIF89a") {
 119                 } else if ($mime != "image/jpeg") {
 120                         $image = @imagecreatefromstring($img_str);
 121
 122                         if($image === FALSE) die();
 123
 124                         q("INSERT INTO `photo`
 125                         ( `uid`, `contact-id`, `guid`, `resource-id`, `created`, `edited`, `filename`, `album`, `height`, `width`, `desc`, `data`, `scale`, `profile`, `allow_cid`, `allow_gid`, `deny_cid`, `deny_gid` )
 126                         VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s', '%s' )",
 127                                 0, 0, get_guid(), dbesc($urlhash),
 128                                 dbesc(datetime_convert()),
 129                                 dbesc(datetime_convert()),
 130                                 dbesc(basename(dbesc($_REQUEST["url"]))),
 131                                 dbesc(''),
 132                                 intval(imagesy($image)),
 133                                 intval(imagesx($image)),
 134                                 $mime,
 135                                 dbesc($img_str),
 136                                 100,
 137                                 intval(0),
 138                                 dbesc(''), dbesc(''), dbesc(''), dbesc('')
 139                         );
 140
 141                 } else {
 142                         $img = new Photo($img_str);
 143                         if($img->is_valid()) {
 144                                 $img->store(0, 0, $urlhash, $_REQUEST['url'], '', 100);
 145                                 //$img->scaleImage(1000); // Test
 146                                 $img_str = $img->imageString();
 147                         }
 148                         $mime = "image/jpeg";
 149                 }
 150         }
 151
 152         // Writing in cachefile
 153         // and (file_exists($cachefile)) and (exif_imagetype($cachefile) > 0))
 154         if ($cachefile != '')
 155                 file_put_contents($cachefile, $img_str);
 156
 157         header("Content-type: $mime");
 158         header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
 159         header('Etag: "'.md5($img_str).'"');
 160         header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
 161         header("Cache-Control: max-age=31536000");
 162
 163         echo $img_str;
 164
 165         if ($a->config["system"]["db_log"] != "") {
 166                 $stamp2 = microtime(true);
 167                 $duration = round($stamp2-$stamp1, 3);
 168                 if ($duration > $a->config["system"]["db_loglimit"])
 169                         @file_put_contents($a->config["system"]["db_log"], $duration."\t".strlen($img_str)."\t".$_REQUEST['url']."\n", FILE_APPEND);
 170         }
 171
 172         killme();
 173 }
 174
 175 /**
 176  * @param $url string
 177  * @return boolean
 178  */
 179 function privacy_image_cache_is_local_image($url) {
 180     if ($url[0] == '/') return true;
 181         if (strtolower(substr($url, 0, 5)) == "data:") return true;
 182
 183         // links normalised - bug #431
 184     $baseurl = normalise_link(get_app()->get_baseurl());
 185         $url = normalise_link($url);
 186     return (substr($url, 0, strlen($baseurl)) == $baseurl);
 187 }
 188
 189 /**
 190  * @param array $matches
 191  * @return string
 192  */
 193 function privacy_image_cache_img_cb($matches) {
 194         // following line changed per bug #431
 195         if (privacy_image_cache_is_local_image($matches[2]))
 196                 return $matches[1] . $matches[2] . $matches[3];
 197
 198         return $matches[1] . get_app()->get_baseurl() . "/privacy_image_cache/?url=" . addslashes(rawurlencode(htmlspecialchars_decode($matches[2]))) . $matches[3];
 199 }
 200
 201 /**
 202  * @param App $a
 203  * @param string $o
 204  */
 205 function privacy_image_cache_prepare_body_hook(&$a, &$o) {
 206         $o["html"] = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o["html"]);
 207 }
 208
 209 /**
 210  * @param App $a
 211  * @param string $o
 212  * Function disabled because the plugin moved
 213  */
 214 function privacy_image_cache_bbcode_hook(&$a, &$o) {
 215         //$o = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o);
 216 }
 217
 218
 219 /**
 220  * @param App $a
 221  * @param string $o
 222  */
 223 function privacy_image_cache_display_item_hook(&$a, &$o) {
 224     if (isset($o["output"])) {
 225         if (isset($o["output"]["thumb"]) && !privacy_image_cache_is_local_image($o["output"]["thumb"]))
 226             $o["output"]["thumb"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["thumb"])));
 227         if (isset($o["output"]["author-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["author-avatar"]))
 228             $o["output"]["author-avatar"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["author-avatar"])));
 229         if (isset($o["output"]["owner-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["owner-avatar"]))
 230             $o["output"]["owner-avatar"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["owner-avatar"])));
 231     }
 232 }
 233
 234
 235 /**
 236  * @param App $a
 237  * @param string $o
 238  */
 239 function privacy_image_cache_ping_xmlize_hook(&$a, &$o) {
 240     if ($o["photo"] != "" && !privacy_image_cache_is_local_image($o["photo"]))
 241         $o["photo"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["photo"])));
 242 }
 243
 244
 245 /**
 246  * @param App $a
 247  * @param null|object $b
 248  */
 249 function privacy_image_cache_cron(&$a = null, &$b = null) {
 250     $cachetime = get_config('privacy_image_cache','cache_time');
 251     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 252
 253     $last = get_config('pi_cache','last_delete');
 254     $time = time();
 255     if ($time < ($last + 3600)) return;
 256
 257     logger("Purging old Cache of the Privacy Image Cache", LOGGER_DEBUG);
 258     q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%" AND `created` < NOW() - INTERVAL %d SECOND', $cachetime);
 259     set_config('pi_cache', 'last_delete', $time);
 260 }
 261
 262
 263
 264
 265 /**
 266  * @param App $a
 267  * @param null|object $o
 268  */
 269 function privacy_image_cache_plugin_admin(&$a, &$o){
 270
 271
 272     $o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("picsave") . '">';
 273
 274     $cachetime = get_config('privacy_image_cache','cache_time');
 275     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 276     $cachetime_h = Ceil($cachetime / 3600);
 277
 278     $o .= '<label for="pic_cachetime">' . t('Lifetime of the cache (in hours)') . '</label>
 279         <input id="pic_cachetime" name="cachetime" type="text" value="' . escape_tags($cachetime_h) . '"><br style="clear: both;">';
 280
 281     $o .= '<input type="submit" name="save" value="' . t('Save') . '">';
 282
 283     $o .= '<h4>' . t('Cache Statistics') . '</h4>';
 284
 285     $num = q('SELECT COUNT(*) num, SUM(LENGTH(data)) size FROM `photo` WHERE `uid`=0 AND `contact-id`=0 AND `resource-id` LIKE "pic:%%"');
 286     $o .= '<label for="statictics_num">' . t('Number of items') . '</label><input style="color: gray;" id="statistics_num" disabled value="' . escape_tags($num[0]['num']) . '"><br style="clear: both;">';
 287     $size = Ceil($num[0]['size'] / (1024 * 1024));
 288     $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;">';
 289
 290     $o .= '<input type="submit" name="delete_all" value="' . t('Delete the whole cache') . '">';
 291 }
 292
 293
 294 /**
 295  * @param App $a
 296  * @param null|object $o
 297  */
 298 function privacy_image_cache_plugin_admin_post(&$a = null, &$o = null){
 299     check_form_security_token_redirectOnErr('/admin/plugins/privacy_image_cache', 'picsave');
 300
 301     if (isset($_REQUEST['save'])) {
 302         $cachetime_h = IntVal($_REQUEST['cachetime']);
 303         if ($cachetime_h < 1) $cachetime_h = 1;
 304         set_config('privacy_image_cache','cache_time', $cachetime_h * 3600);
 305     }
 306     if (isset($_REQUEST['delete_all'])) {
 307         q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%"');
 308     }
 309 }