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     $urlhash = 'pic:' . sha1($_REQUEST['url']);
  34     $r = q("SELECT * FROM `photo` WHERE `resource-id` = '%s' LIMIT 1", $urlhash );
  35     if (count($r)) {
  36         $img_str = $r[0]['data'];
  37     }
  38     else {
  39         require_once("Photo.php");
  40
  41         $img_str = fetch_url($_REQUEST['url'],true);
  42         $img = new Photo($img_str);
  43         if($img->is_valid()) {
  44             $img->store(0, 0, $urlhash, $_REQUEST['url'], '', 100);
  45             $img_str = $img->imageString();
  46         }
  47     }
  48
  49
  50     header("Content-type: image/jpeg");
  51     header("Expires: " . gmdate("D, d M Y H:i:s", time() + (3600*24)) . " GMT");
  52     header("Cache-Control: max-age=" . (3600*24));
  53
  54     echo $img_str;
  55
  56     killme();
  57 }
  58
  59 /**
  60  * @param $url string
  61  * @return boolean
  62  */
  63 function privacy_image_cache_is_local_image($url) {
  64     if ($url[0] == '/') return true;
  65         // links normalised - bug #431
  66     $baseurl = normalise_link(get_app()->get_baseurl());
  67         $url = normalise_link($url);
  68     return (substr($url, 0, strlen($baseurl)) == $baseurl);
  69 }
  70
  71 /**
  72  * @param array $matches
  73  * @return string
  74  */
  75 function privacy_image_cache_img_cb($matches) {
  76         // following line changed per bug #431
  77     if (privacy_image_cache_is_local_image($matches[2])) return $matches[1] . $matches[2] . $matches[3];
  78     return $matches[1] . "/privacy_image_cache/?url=" . escape_tags(addslashes($matches[2])) . $matches[3];
  79 }
  80
  81 /**
  82  * @param App $a
  83  * @param string $o
  84  */
  85 function privacy_image_cache_bbcode_hook(&$a, &$o) {
  86     $o = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o);
  87 }
  88
  89
  90 /**
  91  * @param App $a
  92  * @param string $o
  93  */
  94 function privacy_image_cache_display_item_hook(&$a, &$o) {
  95     if (isset($o["output"])) {
  96         if (isset($o["output"]["thumb"]) && !privacy_image_cache_is_local_image($o["output"]["thumb"]))
  97             $o["output"]["thumb"] = "/privacy_image_cache/?url=" . escape_tags(addslashes($o["output"]["thumb"]));
  98         if (isset($o["output"]["author-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["author-avatar"]))
  99             $o["output"]["author-avatar"] = "/privacy_image_cache/?url=" . escape_tags(addslashes($o["output"]["author-avatar"]));
 100     }
 101 }
 102
 103
 104 /**
 105  * @param App $a
 106  * @param string $o
 107  */
 108 function privacy_image_cache_ping_xmlize_hook(&$a, &$o) {
 109     if ($o["photo"] != "" && !privacy_image_cache_is_local_image($o["photo"]))
 110         $o["photo"] = "/privacy_image_cache/?url=" . escape_tags(addslashes($o["photo"]));
 111 }
 112
 113
 114 /**
 115  * @param App $a
 116  * @param null|object $b
 117  */
 118 function privacy_image_cache_cron(&$a = null, &$b = null) {
 119     $cachetime = get_config('privacy_image_cache','cache_time');
 120     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 121
 122     $last = get_config('pi_cache','last_delete');
 123     $time = time();
 124     if ($time < ($last + 3600)) return;
 125
 126     logger("Purging old Cache of the Privacy Image Cache", LOGGER_DEBUG);
 127     q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%" AND `created` < NOW() - INTERVAL %d SECOND', $cachetime);
 128     set_config('pi_cache', 'last_delete', $time);
 129 }
 130
 131
 132
 133
 134 /**
 135  * @param App $a
 136  * @param null|object $o
 137  */
 138 function privacy_image_cache_plugin_admin(&$a, &$o){
 139
 140
 141     $o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("picsave") . '">';
 142
 143     $cachetime = get_config('privacy_image_cache','cache_time');
 144     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 145     $cachetime_h = Ceil($cachetime / 3600);
 146
 147     $o .= '<label for="pic_cachetime">' . t('Lifetime of the cache (in hours)') . '</label>
 148         <input id="pic_cachetime" name="cachetime" type="text" value="' . escape_tags($cachetime_h) . '"><br style="clear: both;">';
 149
 150     $o .= '<input type="submit" name="save" value="' . t('Save') . '">';
 151
 152     $o .= '<h4>' . t('Cache Statistics') . '</h4>';
 153
 154     $num = q('SELECT COUNT(*) num, SUM(LENGTH(data)) size FROM `photo` WHERE `uid`=0 AND `contact-id`=0 AND `resource-id` LIKE "pic:%%"');
 155     $o .= '<label for="statictics_num">' . t('Number of items') . '</label><input style="color: gray;" id="statistics_num" disabled value="' . escape_tags($num[0]['num']) . '"><br style="clear: both;">';
 156     $size = Ceil($num[0]['size'] / (1024 * 1024));
 157     $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;">';
 158
 159     $o .= '<input type="submit" name="delete_all" value="' . t('Delete the whole cache') . '">';
 160 }
 161
 162
 163 /**
 164  * @param App $a
 165  * @param null|object $o
 166  */
 167 function privacy_image_cache_plugin_admin_post(&$a = null, &$o = null){
 168     check_form_security_token_redirectOnErr('/admin/plugins/privacy_image_cache', 'picsave');
 169
 170     if (isset($_REQUEST['save'])) {
 171         $cachetime_h = IntVal($_REQUEST['cachetime']);
 172         if ($cachetime_h < 1) $cachetime_h = 1;
 173         set_config('privacy_image_cache','cache_time', $cachetime_h * 3600);
 174     }
 175     if (isset($_REQUEST['delete_all'])) {
 176         q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%"');
 177     }
 178 }