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