From 2a4e8972e0edfa3156d9ce54d68ce0e54c0ec289 Mon Sep 17 00:00:00 2001
From: redmatrix <git@macgirvin.com>
Date: Mon, 18 Apr 2016 20:38:38 -0700
Subject: module updates

---
 Zotlabs/Module/Photo.php | 250 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 250 insertions(+)
 create mode 100644 Zotlabs/Module/Photo.php

(limited to 'Zotlabs/Module/Photo.php')

diff --git a/Zotlabs/Module/Photo.php b/Zotlabs/Module/Photo.php
new file mode 100644
index 000000000..408688886
--- /dev/null
+++ b/Zotlabs/Module/Photo.php
@@ -0,0 +1,250 @@
+<?php
+namespace Zotlabs\Module;
+
+require_once('include/security.php');
+require_once('include/photo/photo_driver.php');
+
+
+class Photo extends \Zotlabs\Web\Controller {
+
+	function init() {
+	
+		$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
+		}
+	
+		$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;
+	
+			$r = q("SELECT * FROM photo WHERE scale = %d AND uid = %d AND photo_usage = %d LIMIT 1",
+				intval($resolution),
+				intval($uid),
+				intval(PHOTO_PROFILE)
+			);
+			if(count($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_storage') : 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. ' . \App::$query_string);
+						$observer = \App::get_observer();
+						logger('mod_photo: observer = ' . (($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
+	}
+	
+}
-- 
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