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