From a61997b2aa8e510c2a9d28f0f3ad477afc7f4e2d Mon Sep 17 00:00:00 2001
From: Mark Nelson <markn@moodle.com>
Date: Wed, 11 Mar 2015 00:29:18 -0700
Subject: [PATCH] Check course time using new logging API

---
 locallib.php | 54 +++++++++++++++++++++++++++++++++++++++-------------
 view.php     | 10 ++++++++++
 2 files changed, 51 insertions(+), 13 deletions(-)

diff --git a/locallib.php b/locallib.php
index 7b42a4b..cafd8d0 100644
--- a/locallib.php
+++ b/locallib.php
@@ -326,30 +326,59 @@ function customcert_get_templates() {
  * @return int the total time spent in seconds
  */
 function customcert_get_course_time($courseid) {
-    global $CFG, $USER;
+    global $CFG, $DB, $USER;
 
-    set_time_limit(0);
+    $logmanager = get_log_manager();
+    $readers = $logmanager->get_readers();
+    $enabledreaders = get_config('tool_log', 'enabled_stores');
+    $enabledreaders = explode(',', $enabledreaders);
 
+    // Go through all the readers until we find one that we can use.
+    foreach ($enabledreaders as $enabledreader) {
+        $reader = $readers[$enabledreader];
+        if ($reader instanceof \logstore_legacy\log\store) {
+            $logtable = 'log';
+            $coursefield = 'course';
+            $timefield = 'time';
+            break;
+        } else if ($reader instanceof \core\log\sql_internal_reader) {
+            $logtable = $reader->get_internal_log_table_name();
+            $coursefield = 'courseid';
+            $timefield = 'timecreated';
+            break;
+        }
+    }
+
+    // If we didn't find a reader then return 0.
+    if (!isset($logtable)) {
+        return 0;
+    }
+
+    $sql = "SELECT id, $timefield
+              FROM {{$logtable}}
+             WHERE userid = :userid
+               AND $coursefield = :courseid
+          ORDER BY $timefield ASC";
+    $params = array('userid' => $USER->id, 'courseid' => $courseid);
     $totaltime = 0;
-    $sql = "l.course = :courseid AND l.userid = :userid";
-    if ($logs = get_logs($sql, array('courseid' => $courseid, 'userid' => $USER->id), 'l.time ASC', '', '', $totalcount)) {
+    if ($logs = $DB->get_recordset_sql($sql, $params)) {
         foreach ($logs as $log) {
             if (!isset($login)) {
-                // For the first time $login is not set so the first log is also the first login.
-                $login = $log->time;
-                $lasthit = $log->time;
+                // For the first time $login is not set so the first log is also the first login
+                $login = $log->$timefield;
+                $lasthit = $log->$timefield;
                 $totaltime = 0;
             }
-            $delay = $log->time - $lasthit;
+            $delay = $log->$timefield - $lasthit;
             if ($delay > ($CFG->sessiontimeout * 60)) {
                 // The difference between the last log and the current log is more than
-                // the timeout register session value meaning we have found a session.
-                $login = $log->time;
+                // the timeout Register session value so that we have found a session!
+                $login = $log->$timefield;
             } else {
                 $totaltime += $delay;
             }
-            // Now the actual log became the previous log for the next cycle.
-            $lasthit = $log->time;
+            // Now the actual log became the previous log for the next cycle
+            $lasthit = $log->$timefield;
         }
 
         return $totaltime;
@@ -358,7 +387,6 @@ function customcert_get_course_time($courseid) {
     return 0;
 }
 
-
 /**
  * Returns a list of issued customcerts.
  *
diff --git a/view.php b/view.php
index c946d86..c7c2254 100644
--- a/view.php
+++ b/view.php
@@ -45,6 +45,16 @@ $PAGE->set_cm($cm);
 $PAGE->set_title(format_string($customcert->name));
 $PAGE->set_heading(format_string($course->fullname));
 
+// Check if the user can view the certificate based on time spent in course.
+if ($customcert->requiredtime && !has_capability('mod/certificate:manage', $context)) {
+    if (customcert_get_course_time($course->id) < ($customcert->requiredtime * 60)) {
+        $a = new stdClass;
+        $a->requiredtime = $customcert->requiredtime;
+        notice(get_string('requiredtimenotmet', 'certificate', $a), "$CFG->wwwroot/course/view.php?id=$course->id");
+        die;
+    }
+}
+
 // Check that no action was passed, if so that means we are not outputting to PDF.
 if (empty($action)) {
     // Get the current groups mode.