251 lines
6.6 KiB
PHP
251 lines
6.6 KiB
PHP
<?php
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namespace Zotlabs\Module;
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require_once('include/security.php');
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require_once('include/photo/photo_driver.php');
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class Photo extends \Zotlabs\Web\Controller {
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function init() {
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$prvcachecontrol = false;
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switch(argc()) {
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case 4:
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$person = argv(3);
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$res = argv(2);
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$type = argv(1);
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break;
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case 2:
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$photo = argv(1);
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break;
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case 1:
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default:
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killme();
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// NOTREACHED
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}
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$observer_xchan = get_observer_hash();
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$default = get_default_profile_photo();
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if(isset($type)) {
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/**
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* Profile photos - Access controls on default profile photos are not honoured since they need to be exchanged with remote sites.
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*
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*/
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if($type === 'profile') {
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switch($res) {
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case 'm':
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$resolution = 5;
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$default = get_default_profile_photo(80);
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break;
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case 's':
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$resolution = 6;
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$default = get_default_profile_photo(48);
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break;
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case 'l':
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default:
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$resolution = 4;
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break;
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}
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}
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$uid = $person;
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$r = q("SELECT * FROM photo WHERE imgscale = %d AND uid = %d AND photo_usage = %d LIMIT 1",
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intval($resolution),
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intval($uid),
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intval(PHOTO_PROFILE)
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);
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if($r) {
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$data = dbunescbin($r[0]['content']);
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$mimetype = $r[0]['mimetype'];
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}
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if(intval($r[0]['os_storage']))
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$data = file_get_contents($data);
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if(! isset($data)) {
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$data = file_get_contents($default);
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$mimetype = 'image/png';
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}
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}
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else {
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/**
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* Other photos
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*/
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/* Check for a cookie to indicate display pixel density, in order to detect high-resolution
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displays. This procedure was derived from the "Retina Images" by Jeremey Worboys,
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used in accordance with the Creative Commons Attribution 3.0 Unported License.
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Project link: https://github.com/Retina-Images/Retina-Images
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License link: http://creativecommons.org/licenses/by/3.0/
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*/
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$cookie_value = false;
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if (isset($_COOKIE['devicePixelRatio'])) {
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$cookie_value = intval($_COOKIE['devicePixelRatio']);
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}
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else {
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// Force revalidation of cache on next request
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$cache_directive = 'no-cache';
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$status = 'no cookie';
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}
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$resolution = 0;
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if(strpos($photo,'.') !== false)
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$photo = substr($photo,0,strpos($photo,'.'));
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if(substr($photo,-2,1) == '-') {
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$resolution = intval(substr($photo,-1,1));
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$photo = substr($photo,0,-2);
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// If viewing on a high-res screen, attempt to serve a higher resolution image:
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if ($resolution == 2 && ($cookie_value > 1))
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{
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$resolution = 1;
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}
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}
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// If using resolution 1, make sure it exists before proceeding:
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if ($resolution == 1)
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{
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$r = q("SELECT uid FROM photo WHERE resource_id = '%s' AND imgscale = %d LIMIT 1",
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dbesc($photo),
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intval($resolution)
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);
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if (!($r))
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$resolution = 2;
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}
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$r = q("SELECT uid FROM photo WHERE resource_id = '%s' AND imgscale = %d LIMIT 1",
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dbesc($photo),
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intval($resolution)
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);
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if($r) {
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$allowed = (($r[0]['uid']) ? perm_is_allowed($r[0]['uid'],$observer_xchan,'view_storage') : true);
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$sql_extra = permissions_sql($r[0]['uid']);
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// Now we'll see if we can access the photo
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$r = q("SELECT * FROM photo WHERE resource_id = '%s' AND imgscale = %d $sql_extra LIMIT 1",
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dbesc($photo),
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intval($resolution)
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);
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if($r && $allowed) {
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$data = dbunescbin($r[0]['content']);
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$mimetype = $r[0]['mimetype'];
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if(intval($r[0]['os_storage']))
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$data = file_get_contents($data);
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}
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else {
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// Does the picture exist? It may be a remote person with no credentials,
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// but who should otherwise be able to view it. Show a default image to let
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// them know permissions was denied. It may be possible to view the image
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// through an authenticated profile visit.
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// There won't be many completely unauthorised people seeing this because
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// they won't have the photo link, so there's a reasonable chance that the person
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// might be able to obtain permission to view it.
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$r = q("SELECT * FROM `photo` WHERE `resource_id` = '%s' AND `imgscale` = %d LIMIT 1",
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dbesc($photo),
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intval($resolution)
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);
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if($r) {
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logger('mod_photo: forbidden. ' . \App::$query_string);
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$observer = \App::get_observer();
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logger('mod_photo: observer = ' . (($observer) ? $observer['xchan_addr'] : '(not authenticated)'));
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$data = file_get_contents('images/nosign.png');
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$mimetype = 'image/png';
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$prvcachecontrol = true;
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}
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}
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}
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}
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if(! isset($data)) {
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if(isset($resolution)) {
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switch($resolution) {
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case 4:
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$data = file_get_contents(get_default_profile_photo());
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$mimetype = 'image/png';
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break;
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case 5:
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$data = file_get_contents(get_default_profile_photo(80));
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$mimetype = 'image/png';
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break;
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case 6:
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$data = file_get_contents(get_default_profile_photo(48));
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$mimetype = 'image/png';
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break;
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default:
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killme();
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// NOTREACHED
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break;
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}
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}
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}
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if(isset($res) && intval($res) && $res < 500) {
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$ph = photo_factory($data, $mimetype);
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if($ph->is_valid()) {
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$ph->scaleImageSquare($res);
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$data = $ph->imageString();
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$mimetype = $ph->getType();
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}
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}
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// Writing in cachefile
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if (isset($cachefile) && $cachefile != '')
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file_put_contents($cachefile, $data);
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if(function_exists('header_remove')) {
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header_remove('Pragma');
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header_remove('pragma');
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}
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header("Content-type: " . $mimetype);
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if($prvcachecontrol) {
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// it is a private photo that they have no permission to view.
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// tell the browser not to cache it, in case they authenticate
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// and subsequently have permission to see it
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header("Cache-Control: no-store, no-cache, must-revalidate");
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}
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else {
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// The photo cache default is 1 day to provide a privacy trade-off,
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// as somebody reducing photo permissions on a photo that is already
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// "in the wild" won't be able to stop the photo from being viewed
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// for this amount amount of time once it is in the browser cache.
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// The privacy expectations of your site members and their perception
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// of privacy where it affects the entire project may be affected.
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// This has performance considerations but we highly recommend you
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// leave it alone.
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$cache = get_config('system','photo_cache_time');
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if(! $cache)
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$cache = (3600 * 24); // 1 day
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header("Expires: " . gmdate("D, d M Y H:i:s", time() + $cache) . " GMT");
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header("Cache-Control: max-age=" . $cache);
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}
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echo $data;
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killme();
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// NOTREACHED
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}
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}
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