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     $baseurl = get_app()->get_baseurl();
  66     return (substr($url, 0, strlen($baseurl)) == $baseurl);
  67 }
  68
  69 /**
  70  * @param array $matches
  71  * @return string
  72  */
  73 function privacy_image_cache_img_cb($matches) {
  74     if (privacy_image_cache_is_local_image($matches[2])) return $matches[2];
  75     return $matches[1] . "/privacy_image_cache/?url=" . escape_tags(addslashes($matches[2])) . $matches[3];
  76 }
  77
  78 /**
  79  * @param App $a
  80  * @param string $o
  81  */
  82 function privacy_image_cache_bbcode_hook(&$a, &$o) {
  83     $o = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o);
  84 }
  85
  86
  87 /**
  88  * @param App $a
  89  * @param string $o
  90  */
  91 function privacy_image_cache_display_item_hook(&$a, &$o) {
  92     if (isset($o["output"])) {
  93         if (isset($o["output"]["thumb"]) && !privacy_image_cache_is_local_image($o["output"]["thumb"]))
  94             $o["output"]["thumb"] = "/privacy_image_cache/?url=" . escape_tags(addslashes($o["output"]["thumb"]));
  95         if (isset($o["output"]["author-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["author-avatar"]))
  96             $o["output"]["author-avatar"] = "/privacy_image_cache/?url=" . escape_tags(addslashes($o["output"]["author-avatar"]));
  97     }
  98 }
  99
 100
 101 /**
 102  * @param App $a
 103  * @param string $o
 104  */
 105 function privacy_image_cache_ping_xmlize_hook(&$a, &$o) {
 106     if ($o["photo"] != "" && !privacy_image_cache_is_local_image($o["photo"]))
 107         $o["photo"] = "/privacy_image_cache/?url=" . escape_tags(addslashes($o["photo"]));
 108 }
 109
 110
 111 /**
 112  * @param App $a
 113  * @param null|object $b
 114  */
 115 function privacy_image_cache_cron(&$a = null, &$b = null) {
 116     $cachetime = get_config('privacy_image_cache','cache_time');
 117     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 118
 119     $last = get_config('pi_cache','last_delete');
 120     $time = time();
 121     if ($time < ($last + 3600)) return;
 122
 123     logger("Purging old Cache of the Privacy Image Cache", LOGGER_DEBUG);
 124     q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%" AND `created` < NOW() - INTERVAL %d SECOND', $cachetime);
 125     set_config('pi_cache', 'last_delete', $time);
 126 }
 127
 128
 129
 130
 131 /**
 132  * @param App $a
 133  * @param null|object $o
 134  */
 135 function privacy_image_cache_plugin_admin(&$a, &$o){
 136
 137
 138     $o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("picsave") . '">';
 139
 140     $cachetime = get_config('privacy_image_cache','cache_time');
 141     if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
 142     $cachetime_h = Ceil($cachetime / 3600);
 143
 144     $o .= '<label for="pic_cachetime">' . t('Lifetime of the cache (in hours)') . '</label>
 145         <input id="pic_cachetime" name="cachetime" type="text" value="' . escape_tags($cachetime_h) . '"><br style="clear: both;">';
 146
 147     $o .= '<input type="submit" name="save" value="' . t('Save') . '">';
 148
 149     $o .= '<h4>' . t('Cache Statistics') . '</h4>';
 150
 151     $num = q('SELECT COUNT(*) num, SUM(LENGTH(data)) size FROM `photo` WHERE `uid`=0 AND `contact-id`=0 AND `resource-id` LIKE "pic:%%"');
 152     $o .= '<label for="statictics_num">' . t('Number of items') . '</label><input style="color: gray;" id="statistics_num" disabled value="' . escape_tags($num[0]['num']) . '"><br style="clear: both;">';
 153     $size = Ceil($num[0]['size'] / (1024 * 1024));
 154     $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;">';
 155
 156     $o .= '<input type="submit" name="delete_all" value="' . t('Delete the whole cache') . '">';
 157 }
 158
 159
 160 /**
 161  * @param App $a
 162  * @param null|object $o
 163  */
 164 function privacy_image_cache_plugin_admin_post(&$a = null, &$o = null){
 165     check_form_security_token_redirectOnErr('/admin/plugins/privacy_image_cache', 'picsave');
 166
 167     if (isset($_REQUEST['save'])) {
 168         $cachetime_h = IntVal($_REQUEST['cachetime']);
 169         if ($cachetime_h < 1) $cachetime_h = 1;
 170         set_config('privacy_image_cache','cache_time', $cachetime_h * 3600);
 171     }
 172     if (isset($_REQUEST['delete_all'])) {
 173         q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%"');
 174     }
 175 }