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('bbcode',       'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_bbcode_hook');
  15     register_hook('display_item', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_display_item_hook');
  16     register_hook('ping_xmlize',  'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_ping_xmlize_hook');
  17     register_hook('cron',         'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_cron');
  18 }
  19
  20
  21 function privacy_image_cache_uninstall() {
  22     unregister_hook('bbcode',       'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_bbcode_hook');
  23     unregister_hook('display_item', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_display_item_hook');
  24     unregister_hook('ping_xmlize',  'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_ping_xmlize_hook');
  25     unregister_hook('cron',         'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_cron');
  26 }
  27
  28
  29 function privacy_image_cache_module() {}
  30
  31
  32 function privacy_image_cache_init() {
  33         if(function_exists('header_remove')) {
  34                 header_remove('Pragma');
  35                 header_remove('pragma');
  36         }
  37
  38         $urlhash = 'pic:' . sha1($_REQUEST['url']);
  39         // Double encoded url - happens with Diaspora
  40         $urlhash2 = 'pic:' . sha1(urldecode($_REQUEST['url']));
  41
  42         $r = q("SELECT * FROM `photo` WHERE `resource-id` in ('%s', '%s') LIMIT 1", $urlhash, $urlhash2);
  43         if (count($r)) {
  44                 $img_str = $r[0]['data'];
  45                 $mime = $r[0]["desc"];
  46                 if ($mime == "") $mime = "image/jpeg";
  47         } else {
  48                 require_once("Photo.php");
  49
  50                 $img_str = fetch_url($_REQUEST['url'],true);
  51                 if (substr($img_str, 0, 6) == "GIF89a") {
  52                         $mime = "image/gif";
  53                         $image = @imagecreatefromstring($img_str);
  54
  55                         if($image === FALSE) die();
  56
  57                         q("INSERT INTO `photo`
  58                         ( `uid`, `contact-id`, `guid`, `resource-id`, `created`, `edited`, `filename`, `album`, `height`, `width`, `desc`, `data`, `scale`, `profile`, `allow_cid`, `allow_gid`, `deny_cid`, `deny_gid` )
  59                         VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s', '%s' )",
  60                                 0, 0, get_guid(), dbesc($urlhash),
  61                                 dbesc(datetime_convert()),
  62                                 dbesc(datetime_convert()),
  63                                 dbesc(basename(dbesc($_REQUEST["url"]))),
  64                                 dbesc(''),
  65                                 intval(imagesy($image)),
  66                                 intval(imagesx($image)),
  67                                 'image/gif',
  68                                 dbesc($img_str),
  69                                 100,
  70                                 intval(0),
  71                                 dbesc(''), dbesc(''), dbesc(''), dbesc('')
  72                         );
  73
  74                 } else {
  75                         $img = new Photo($img_str);
  76                         if($img->is_valid()) {
  77                                 $img->store(0, 0, $urlhash, $_REQUEST['url'], '', 100);
  78                                 $img_str = $img->imageString();
  79                         }
  80                         $mime = "image/jpeg";
  81                 }
  82         }
  83
  84
  85         header("Content-type: $mime");
  86         header("Expires: " . gmdate("D, d M Y H:i:s", time() + (3600*24)) . " GMT");
  87         header("Cache-Control: max-age=" . (3600*24));
  88
  89         echo $img_str;
  90
  91         killme();
  92 }
  93
  94 /**
  95  * @param $url string
  96  * @return boolean
  97  */
  98 function privacy_image_cache_is_local_image($url) {
  99     if ($url[0] == '/') return true;
 100         if (strtolower(substr($url, 0, 5)) == "data:") return true;
 101
 102         // links normalised - bug #431
 103     $baseurl = normalise_link(get_app()->get_baseurl());
 104         $url = normalise_link($url);
 105     return (substr($url, 0, strlen($baseurl)) == $baseurl);
 106 }
 107
 108 /**
 109  * @param array $matches
 110  * @return string
 111  */
 112 function privacy_image_cache_img_cb($matches) {
 113         // following line changed per bug #431
 114         if (privacy_image_cache_is_local_image($matches[2]))
 115                 return $matches[1] . $matches[2] . $matches[3];
 116
 117         return $matches[1] . get_app()->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($matches[2]))) . $matches[3];
 118 }
 119
 120 /**
 121  * @param App $a
 122  * @param string $o
 123  */
 124 function privacy_image_cache_bbcode_hook(&$a, &$o) {
 125     $o = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o);
 126 }
 127
 128
 129 /**
 130  * @param App $a
 131  * @param string $o
 132  */
 133 function privacy_image_cache_display_item_hook(&$a, &$o) {
 134     if (isset($o["output"])) {
 135         if (isset($o["output"]["thumb"]) && !privacy_image_cache_is_local_image($o["output"]["thumb"]))
 136             $o["output"]["thumb"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["thumb"])));
 137         if (isset($o["output"]["author-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["author-avatar"]))
 138             $o["output"]["author-avatar"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["author-avatar"])));
 139     }
 140 }
 141
 142
 143 /**
 144  * @param App $a
 145  * @param string $o
 146  */
 147 function privacy_image_cache_ping_xmlize_hook(&$a, &$o) {
 148     if ($o["photo"] != "" && !privacy_image_cache_is_local_image($o["photo"]))
 149         $o["photo"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["photo"])));
 150 }
 151
 152
 153 /**
 154  * @param App $a
 155  * @param null|object $b
 156  */
 157 function privacy_image_cache_cron(&$a = null, &$b = null) {
 158     $cachetime = get_config('privacy_image_cache','cache_time');
 159     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 160
 161     $last = get_config('pi_cache','last_delete');
 162     $time = time();
 163     if ($time < ($last + 3600)) return;
 164
 165     logger("Purging old Cache of the Privacy Image Cache", LOGGER_DEBUG);
 166     q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%" AND `created` < NOW() - INTERVAL %d SECOND', $cachetime);
 167     set_config('pi_cache', 'last_delete', $time);
 168 }
 169
 170
 171
 172
 173 /**
 174  * @param App $a
 175  * @param null|object $o
 176  */
 177 function privacy_image_cache_plugin_admin(&$a, &$o){
 178
 179
 180     $o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("picsave") . '">';
 181
 182     $cachetime = get_config('privacy_image_cache','cache_time');
 183     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 184     $cachetime_h = Ceil($cachetime / 3600);
 185
 186     $o .= '<label for="pic_cachetime">' . t('Lifetime of the cache (in hours)') . '</label>
 187         <input id="pic_cachetime" name="cachetime" type="text" value="' . escape_tags($cachetime_h) . '"><br style="clear: both;">';
 188
 189     $o .= '<input type="submit" name="save" value="' . t('Save') . '">';
 190
 191     $o .= '<h4>' . t('Cache Statistics') . '</h4>';
 192
 193     $num = q('SELECT COUNT(*) num, SUM(LENGTH(data)) size FROM `photo` WHERE `uid`=0 AND `contact-id`=0 AND `resource-id` LIKE "pic:%%"');
 194     $o .= '<label for="statictics_num">' . t('Number of items') . '</label><input style="color: gray;" id="statistics_num" disabled value="' . escape_tags($num[0]['num']) . '"><br style="clear: both;">';
 195     $size = Ceil($num[0]['size'] / (1024 * 1024));
 196     $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;">';
 197
 198     $o .= '<input type="submit" name="delete_all" value="' . t('Delete the whole cache') . '">';
 199 }
 200
 201
 202 /**
 203  * @param App $a
 204  * @param null|object $o
 205  */
 206 function privacy_image_cache_plugin_admin_post(&$a = null, &$o = null){
 207     check_form_security_token_redirectOnErr('/admin/plugins/privacy_image_cache', 'picsave');
 208
 209     if (isset($_REQUEST['save'])) {
 210         $cachetime_h = IntVal($_REQUEST['cachetime']);
 211         if ($cachetime_h < 1) $cachetime_h = 1;
 212         set_config('privacy_image_cache','cache_time', $cachetime_h * 3600);
 213     }
 214     if (isset($_REQUEST['delete_all'])) {
 215         q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%"');
 216     }
 217 }