friendica-addons/privacy_image_cache/privacy_image_cache.php

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2012-04-22 09:19:45 -04:00
<?php
/**
* Name: Privacy Image Cache
* Version: 0.1
* Author: Tobias Hößl <https://github.com/CatoTH/>
*/
define("PRIVACY_IMAGE_CACHE_DEFAULT_TIME", 86400); // 1 Day
require_once('include/security.php');
require_once("include/Photo.php");
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function privacy_image_cache_install() {
register_hook('prepare_body', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_prepare_body_hook');
// register_hook('bbcode', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_bbcode_hook');
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register_hook('display_item', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_display_item_hook');
register_hook('ping_xmlize', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_ping_xmlize_hook');
register_hook('cron', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_cron');
}
function privacy_image_cache_uninstall() {
unregister_hook('prepare_body', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_prepare_body_hook');
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unregister_hook('bbcode', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_bbcode_hook');
unregister_hook('display_item', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_display_item_hook');
unregister_hook('ping_xmlize', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_ping_xmlize_hook');
unregister_hook('cron', 'addon/privacy_image_cache/privacy_image_cache.php', 'privacy_image_cache_cron');
}
function privacy_image_cache_module() {}
function privacy_image_cache_init() {
global $a, $_SERVER;
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
header('HTTP/1.1 304 Not Modified');
header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
header('Etag: '.$_SERVER['HTTP_IF_NONE_MATCH']);
header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
header("Cache-Control: max-age=31536000");
if(function_exists('header_remove')) {
header_remove('Last-Modified');
header_remove('Expires');
header_remove('Cache-Control');
}
exit;
}
if(function_exists('header_remove')) {
header_remove('Pragma');
header_remove('pragma');
}
$thumb = false;
// Look for filename in the arguments
if (isset($a->argv[1]) OR isset($a->argv[2])) {
if (isset($a->argv[2]))
$url = $a->argv[2];
else
$url = $a->argv[1];
$pos = strrpos($url, "==.");
if ($pos)
$url = substr($url, 0, $pos+2);
$url = base64_decode(strtr($url, '-_', '+/'), true);
if ($url)
$_REQUEST['url'] = $url;
$thumb = (isset($a->argv[3]) and ($a->argv[3] == "thumb"));
}
$urlhash = 'pic:' . sha1($_REQUEST['url']);
// Double encoded url - happens with Diaspora
$urlhash2 = 'pic:' . sha1(urldecode($_REQUEST['url']));
$cachefile = get_cachefile(hash("md5", $_REQUEST['url']));
if ($cachefile != '') {
if (file_exists($cachefile)) {
$img_str = file_get_contents($cachefile);
$mime = image_type_to_mime_type(exif_imagetype($cachefile));
header("Content-type: $mime");
header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
header('Etag: "'.md5($img_str).'"');
header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
header("Cache-Control: max-age=31536000");
// reduce quality - if it isn't a GIF
if ($mime != "image/gif") {
$img = new Photo($img_str, $mime);
if($img->is_valid())
$img_str = $img->imageString();
}
echo $img_str;
if (is_dir($_SERVER["DOCUMENT_ROOT"]."/privacy_image_cache"))
file_put_contents($_SERVER["DOCUMENT_ROOT"]."/privacy_image_cache/".privacy_image_cache_cachename($_REQUEST['url'], true), $img_str);
killme();
}
}
$valid = true;
$r = q("SELECT * FROM `photo` WHERE `resource-id` in ('%s', '%s') LIMIT 1", $urlhash, $urlhash2);
if (count($r)) {
$img_str = $r[0]['data'];
$mime = $r[0]["desc"];
if ($mime == "") $mime = "image/jpeg";
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} else {
// It shouldn't happen but it does - spaces in URL
$_REQUEST['url'] = str_replace(" ", "+", $_REQUEST['url']);
$redirects = 0;
$img_str = fetch_url($_REQUEST['url'],true, $redirects, 10);
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$tempfile = tempnam(get_config("system","temppath"), "cache");
file_put_contents($tempfile, $img_str);
$mime = image_type_to_mime_type(exif_imagetype($tempfile));
unlink($tempfile);
// If there is an error then return a blank image
if ((substr($a->get_curl_code(), 0, 1) == "4") or (!$img_str)) {
$img_str = file_get_contents("images/blank.png");
$mime = "image/png";
$cachefile = ""; // Clear the cachefile so that the dummy isn't stored
$valid = false;
$img = new Photo($img_str, "image/png");
if($img->is_valid()) {
$img->scaleImage(10);
$img_str = $img->imageString();
}
} else if ($mime != "image/jpeg") {
$image = @imagecreatefromstring($img_str);
if($image === FALSE) die();
q("INSERT INTO `photo`
( `uid`, `contact-id`, `guid`, `resource-id`, `created`, `edited`, `filename`, `album`, `height`, `width`, `desc`, `data`, `scale`, `profile`, `allow_cid`, `allow_gid`, `deny_cid`, `deny_gid` )
VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s', '%s' )",
0, 0, get_guid(), dbesc($urlhash),
dbesc(datetime_convert()),
dbesc(datetime_convert()),
dbesc(basename(dbesc($_REQUEST["url"]))),
dbesc(''),
intval(imagesy($image)),
intval(imagesx($image)),
$mime,
dbesc($img_str),
100,
intval(0),
dbesc(''), dbesc(''), dbesc(''), dbesc('')
);
} else {
$img = new Photo($img_str, $mime);
if($img->is_valid()) {
$img->store(0, 0, $urlhash, $_REQUEST['url'], '', 100);
if ($thumb)
$img->scaleImage(200); // Test
$img_str = $img->imageString();
}
//$mime = "image/jpeg";
}
}
// reduce quality - if it isn't a GIF
if ($mime != "image/gif") {
$img = new Photo($img_str, $mime);
if($img->is_valid())
$img_str = $img->imageString();
}
// If there is a real existing directory then put the cache file there
// advantage: real file access is really fast
// Otherwise write in cachefile
if ($valid AND is_dir($_SERVER["DOCUMENT_ROOT"]."/privacy_image_cache"))
file_put_contents($_SERVER["DOCUMENT_ROOT"]."/privacy_image_cache/".privacy_image_cache_cachename($_REQUEST['url'], true), $img_str);
elseif ($cachefile != '')
file_put_contents($cachefile, $img_str);
header("Content-type: $mime");
// Only output the cache headers when the file is valid
if ($valid) {
header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
header('Etag: "'.md5($img_str).'"');
header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
header("Cache-Control: max-age=31536000");
}
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echo $img_str;
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killme();
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}
function privacy_image_cache_cachename($url, $writemode = false) {
global $_SERVER;
// echo $url;
// $mime = image_type_to_mime_type(exif_imagetype($url));
// echo $mime;
$basepath = $_SERVER["DOCUMENT_ROOT"]."/privacy_image_cache";
$path = substr(hash("md5", $url), 0, 2);
if (is_dir($basepath) and $writemode)
if (!is_dir($basepath."/".$path)) {
mkdir($basepath."/".$path);
chmod($basepath."/".$path, 0777);
}
$path .= "/".strtr(base64_encode($url), '+/', '-_');
return($path);
}
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/**
* @param $url string
* @return boolean
*/
function privacy_image_cache_is_local_image($url) {
if ($url[0] == '/') return true;
if (strtolower(substr($url, 0, 5)) == "data:") return true;
// Check if the cached path would be longer than 255 characters - apache doesn't like it
if (is_dir($_SERVER["DOCUMENT_ROOT"]."/privacy_image_cache")) {
$cachedurl = get_app()->get_baseurl()."/privacy_image_cache/". privacy_image_cache_cachename($url);
if (strlen($url) > 150)
return true;
}
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// links normalised - bug #431
$baseurl = normalise_link(get_app()->get_baseurl());
$url = normalise_link($url);
return (substr($url, 0, strlen($baseurl)) == $baseurl);
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}
/**
* @param array $matches
* @return string
*/
function privacy_image_cache_img_cb($matches) {
// if the picture seems to be from another picture cache then take the original source
$queryvar = privacy_image_cache_parse_query($matches[2]);
if ($queryvar['url'] != "")
$matches[2] = urldecode($queryvar['url']);
// if fetching facebook pictures don't fetch the thumbnail but the big one
if (strpos($matches[2], ".fbcdn.net/") and (substr($matches[2], -6) == "_s.jpg"))
$matches[2] = substr($matches[2], 0, -6)."_n.jpg";
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// following line changed per bug #431
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if (privacy_image_cache_is_local_image($matches[2]))
return $matches[1] . $matches[2] . $matches[3];
//return $matches[1] . get_app()->get_baseurl() . "/privacy_image_cache/?url=" . addslashes(rawurlencode(htmlspecialchars_decode($matches[2]))) . $matches[3];
return $matches[1].get_app()->get_baseurl()."/privacy_image_cache/". privacy_image_cache_cachename(htmlspecialchars_decode($matches[2])).$matches[3];
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}
/**
* @param App $a
* @param string $o
*/
function privacy_image_cache_prepare_body_hook(&$a, &$o) {
$o["html"] = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o["html"]);
}
/**
* @param App $a
* @param string $o
* Function disabled because the plugin moved
*/
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function privacy_image_cache_bbcode_hook(&$a, &$o) {
//$o = preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "privacy_image_cache_img_cb", $o);
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}
/**
* @param App $a
* @param string $o
*/
function privacy_image_cache_display_item_hook(&$a, &$o) {
if (isset($o["output"])) {
if (isset($o["output"]["thumb"]) && !privacy_image_cache_is_local_image($o["output"]["thumb"]))
$o["output"]["thumb"] = $a->get_baseurl() . "/privacy_image_cache/".privacy_image_cache_cachename($o["output"]["thumb"]);
//$o["output"]["thumb"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["thumb"])));
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if (isset($o["output"]["author-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["author-avatar"]))
$o["output"]["author-avatar"] = $a->get_baseurl() . "/privacy_image_cache/".privacy_image_cache_cachename($o["output"]["author-avatar"]);
//$o["output"]["author-avatar"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["author-avatar"])));
if (isset($o["output"]["owner-avatar"]) && !privacy_image_cache_is_local_image($o["output"]["owner-avatar"]))
$o["output"]["owner-avatar"] = $a->get_baseurl() . "/privacy_image_cache/".privacy_image_cache_cachename($o["output"]["owner-avatar"]);
//$o["output"]["owner-avatar"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["output"]["owner-avatar"])));
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}
}
/**
* @param App $a
* @param string $o
*/
function privacy_image_cache_ping_xmlize_hook(&$a, &$o) {
if ($o["photo"] != "" && !privacy_image_cache_is_local_image($o["photo"]))
$o["photo"] = $a->get_baseurl() . "/privacy_image_cache/".privacy_image_cache_cachename($o["photo"]);
//$o["photo"] = $a->get_baseurl() . "/privacy_image_cache/?url=" . escape_tags(addslashes(rawurlencode($o["photo"])));
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}
/**
* @param App $a
* @param null|object $b
*/
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function privacy_image_cache_cron(&$a = null, &$b = null) {
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$cachetime = get_config('privacy_image_cache','cache_time');
if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
$last = get_config('pi_cache','last_delete');
$time = time();
if ($time < ($last + 3600)) return;
logger("Purging old Cache of the Privacy Image Cache", LOGGER_DEBUG);
q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%" AND `created` < NOW() - INTERVAL %d SECOND', $cachetime);
clear_cache($a->get_basepath(), $a->get_basepath()."/privacy_image_cache");
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set_config('pi_cache', 'last_delete', $time);
}
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/**
* @param App $a
* @param null|object $o
*/
function privacy_image_cache_plugin_admin(&$a, &$o){
$o = '<input type="hidden" name="form_security_token" value="' . get_form_security_token("picsave") . '">';
$cachetime = get_config('privacy_image_cache','cache_time');
if (!$cachetime) $cachetime = PRIVACY_IMAGE_CACHE_DEFAULT_TIME;
$cachetime_h = Ceil($cachetime / 3600);
$o .= '<label for="pic_cachetime">' . t('Lifetime of the cache (in hours)') . '</label>
<input id="pic_cachetime" name="cachetime" type="text" value="' . escape_tags($cachetime_h) . '"><br style="clear: both;">';
$o .= '<input type="submit" name="save" value="' . t('Save') . '">';
$o .= '<h4>' . t('Cache Statistics') . '</h4>';
$num = q('SELECT COUNT(*) num, SUM(LENGTH(data)) size FROM `photo` WHERE `uid`=0 AND `contact-id`=0 AND `resource-id` LIKE "pic:%%"');
$o .= '<label for="statictics_num">' . t('Number of items') . '</label><input style="color: gray;" id="statistics_num" disabled value="' . escape_tags($num[0]['num']) . '"><br style="clear: both;">';
$size = Ceil($num[0]['size'] / (1024 * 1024));
$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;">';
$o .= '<input type="submit" name="delete_all" value="' . t('Delete the whole cache') . '">';
}
/**
* @param App $a
* @param null|object $o
*/
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function privacy_image_cache_plugin_admin_post(&$a = null, &$o = null){
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check_form_security_token_redirectOnErr('/admin/plugins/privacy_image_cache', 'picsave');
if (isset($_REQUEST['save'])) {
$cachetime_h = IntVal($_REQUEST['cachetime']);
if ($cachetime_h < 1) $cachetime_h = 1;
set_config('privacy_image_cache','cache_time', $cachetime_h * 3600);
}
if (isset($_REQUEST['delete_all'])) {
q('DELETE FROM `photo` WHERE `uid` = 0 AND `resource-id` LIKE "pic:%%"');
}
}
function privacy_image_cache_parse_query($var) {
/**
* Use this function to parse out the query array element from
* the output of parse_url().
*/
$var = parse_url($var, PHP_URL_QUERY);
$var = html_entity_decode($var);
$var = explode('&', $var);
$arr = array();
foreach($var as $val) {
$x = explode('=', $val);
$arr[$x[0]] = $x[1];
}
unset($val, $x, $var);
return $arr;
}