+/**
+ * Utility function for checking if the logged in user can view
+ * another's completion data for a particular course
+ *
+ * @access public
+ * @param int $userid Completion data's owner
+ * @param mixed $course Course object or Course ID (optional)
+ * @return boolean
+ */
+function completion_can_view_data($userid, $course = null) {
+ global $USER;
+
+ if (!isloggedin()) {
+ return false;
+ }
+
+ if (!is_object($course)) {
+ $cid = $course;
+ $course = new object();
+ $course->id = $cid;
+ }
+
+ // Check if this is the site course
+ if ($course->id == SITEID) {
+ $course = null;
+ }
+
+ // Check if completion is enabled
+ if ($course) {
+ $cinfo = new completion_info($course);
+ if (!$cinfo->is_enabled()) {
+ return false;
+ }
+ } else {
+ if (!completion_info::is_enabled_for_site()) {
+ return false;
+ }
+ }
+
+ // Is own user's data?
+ if ($USER->id == $userid) {
+ return true;
+ }
+
+ // Check capabilities
+ $personalcontext = context_user::instance($userid);
+
+ if (has_capability('moodle/user:viewuseractivitiesreport', $personalcontext)) {
+ return true;
+ } elseif (has_capability('report/completion:view', $personalcontext)) {
+ return true;
+ }
+
+ if ($course->id) {
+ $coursecontext = context_course::instance($course->id);
+ } else {
+ $coursecontext = context_system::instance();
+ }
+
+ if (has_capability('report/completion:view', $coursecontext)) {
+ return true;
+ }
+
+ return false;
+}
+
+
