Merge branch 'wip-MDL-27177-master' of git://github.com/abgreeve/moodle

diff --cc user/lib.php
index 080c2ab,7f0f47c..482b167
--- 1/user/lib.php
--- 2/user/lib.php
+++ b/user/lib.php
@@@ -1067,3 -1067,61 +1067,60 @@@ function user_mygrades_url($userid = nu
      }
      return $url;
  }
 -
+ 
+ /**
+  * Check if a user has the permission to viewdetails in a shared course's context.
+  *
+  * @param object $user The other user's details.
+  * @param object $course Use this course to see if we have permission to see this user's profile.
+  * @param context $usercontext The user context if available.
+  * @return bool true for ability to view this user, else false.
+  */
+ function user_can_view_profile($user, $course = null, $usercontext = null) {
+     global $USER, $CFG;
+ 
+     if ($user->deleted) {
+         return false;
+     }
+ 
+     // If any of these four things, return true.
+     // Number 1.
+     if ($USER->id == $user->id) {
+         return true;
+     }
+ 
+     // Number 2.
+     if (empty($CFG->forceloginforprofiles)) {
+         return true;
+     }
+ 
+     if (empty($usercontext)) {
+         $usercontext = context_user::instance($user->id);
+     }
+     // Number 3.
+     if (has_capability('moodle/user:viewdetails', $usercontext)) {
+         return true;
+     }
+ 
+     // Number 4.
+     if (has_coursecontact_role($user->id)) {
+         return true;
+     }
+ 
+     if (isset($course)) {
+         $sharedcourses = array($course);
+     } else {
+         $sharedcourses = enrol_get_shared_courses($USER->id, $user->id, true);
+     }
+     foreach ($sharedcourses as $sharedcourse) {
+         $coursecontext = context_course::instance($sharedcourse->id);
+         if (has_capability('moodle/user:viewdetails', $coursecontext)) {
+             if (!groups_user_groups_visible($sharedcourse, $user->id)) {
+                 // Not a member of the same group.
+                 continue;
+             }
+             return true;
+         }
+     }
+     return false;
+ }