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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* class block_recent_activity
*
* @package block_recent_activity
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once($CFG->dirroot.'/course/lib.php');
/**
* class block_recent_activity
*
* @package block_recent_activity
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class block_recent_activity extends block_base {
/**
* Use {@link block_recent_activity::get_timestart()} to access
*
* @var int stores the time since when we want to show recent activity
*/
protected $timestart = null;
/**
* Initialises the block
*/
function init() {
$this->title = get_string('pluginname', 'block_recent_activity');
}
/**
* Returns the content object
*
* @return stdObject
*/
function get_content() {
if ($this->content !== NULL) {
return $this->content;
}
if (empty($this->instance)) {
$this->content = '';
return $this->content;
}
$this->content = new stdClass;
$this->content->text = '';
$this->content->footer = '';
$renderer = $this->page->get_renderer('block_recent_activity');
$this->content->text = $renderer->recent_activity($this->page->course,
$this->get_timestart(),
$this->get_recent_enrolments(),
$this->get_structural_changes(),
$this->get_modules_recent_activity());
return $this->content;
}
/**
* Returns the time since when we want to show recent activity
*
* For guest users it is 2 days, for registered users it is the time of last access to the course
*
* @return int
*/
protected function get_timestart() {
global $USER;
if ($this->timestart === null) {
$this->timestart = round(time() - COURSE_MAX_RECENT_PERIOD, -2); // better db caching for guests - 100 seconds
if (!isguestuser()) {
if (!empty($USER->lastcourseaccess[$this->page->course->id])) {
if ($USER->lastcourseaccess[$this->page->course->id] > $this->timestart) {
$this->timestart = $USER->lastcourseaccess[$this->page->course->id];
}
}
}
}
return $this->timestart;
}
/**
* Returns all recent enrolments.
*
* This function previously used get_recent_enrolments located in lib/deprecatedlib.php which would
* return an empty array which was identified in MDL-36993. The use of this function outside the
* deprecated lib was removed in MDL-40649.
*
* @todo MDL-36993 this function always return empty array
* @return array array of entries from {user} table
*/
protected function get_recent_enrolments() {
return array();
}
/**
* Returns list of recent changes in course structure
*
* It includes adding, editing or deleting of the resources or activities
* Excludes changes on modules without a view link (i.e. labels), and also
* if activity was both added and deleted
*
* @return array array of changes. Each element is an array containing attributes:
* 'action' - one of: 'add mod', 'update mod', 'delete mod'
* 'module' - instance of cm_info (for 'delete mod' it is an object with attributes modname and modfullname)
*/
protected function get_structural_changes() {
global $DB;
$course = $this->page->course;
$context = context_course::instance($course->id);
$canviewdeleted = has_capability('block/recent_activity:viewdeletemodule', $context);
$canviewupdated = has_capability('block/recent_activity:viewaddupdatemodule', $context);
if (!$canviewdeleted && !$canviewupdated) {
return;
}
$timestart = $this->get_timestart();
$changelist = array();
// The following query will retrieve the latest action for each course module in the specified course.
// Also the query filters out the modules that were created and then deleted during the given interval.
$sql = "SELECT
cmid, MIN(action) AS minaction, MAX(action) AS maxaction, MAX(modname) AS modname
FROM {block_recent_activity}
WHERE timecreated > ? AND courseid = ?
GROUP BY cmid
ORDER BY MAX(timecreated) ASC";
$params = array($timestart, $course->id);
$logs = $DB->get_records_sql($sql, $params);
if (isset($logs[0])) {
// If special record for this course and cmid=0 is present, migrate logs.
self::migrate_logs($course);
$logs = $DB->get_records_sql($sql, $params);
}
if ($logs) {
$modinfo = get_fast_modinfo($course);
foreach ($logs as $log) {
// We used aggregate functions since constants CM_CREATED, CM_UPDATED and CM_DELETED have ascending order (0,1,2).
$wasdeleted = ($log->maxaction == block_recent_activity_observer::CM_DELETED);
$wascreated = ($log->minaction == block_recent_activity_observer::CM_CREATED);
if ($wasdeleted && $wascreated) {
// Activity was created and deleted within this interval. Do not show it.
continue;
} else if ($wasdeleted && $canviewdeleted) {
if (plugin_supports('mod', $log->modname, FEATURE_NO_VIEW_LINK, false)) {
// Better to call cm_info::has_view() because it can be dynamic.
// But there is no instance of cm_info now.
continue;
}
// Unfortunately we do not know if the mod was visible.
$modnames = get_module_types_names();
$changelist[$log->cmid] = array('action' => 'delete mod',
'module' => (object)array(
'modname' => $log->modname,
'modfullname' => isset($modnames[$log->modname]) ? $modnames[$log->modname] : $log->modname
));
} else if (!$wasdeleted && isset($modinfo->cms[$log->cmid]) && $canviewupdated) {
// Module was either added or updated during this interval and it currently exists.
// If module was both added and updated show only "add" action.
$cm = $modinfo->cms[$log->cmid];
if ($cm->has_view() && $cm->uservisible) {
$changelist[$log->cmid] = array(
'action' => $wascreated ? 'add mod' : 'update mod',
'module' => $cm
);
}
}
}
}
return $changelist;
}
/**
* Returns list of recent activity within modules
*
* For each used module type executes callback MODULE_print_recent_activity()
*
* @return array array of pairs moduletype => content
*/
protected function get_modules_recent_activity() {
$context = context_course::instance($this->page->course->id);
$viewfullnames = has_capability('moodle/site:viewfullnames', $context);
$hascontent = false;
$modinfo = get_fast_modinfo($this->page->course);
$usedmodules = $modinfo->get_used_module_names();
$recentactivity = array();
foreach ($usedmodules as $modname => $modfullname) {
// Each module gets it's own logs and prints them
ob_start();
$hascontent = component_callback('mod_'. $modname, 'print_recent_activity',
array($this->page->course, $viewfullnames, $this->get_timestart()), false);
if ($hascontent) {
$recentactivity[$modname] = ob_get_contents();
}
ob_end_clean();
}
return $recentactivity;
}
/**
* Which page types this block may appear on.
*
* @return array page-type prefix => true/false.
*/
function applicable_formats() {
return array('all' => true, 'my' => false, 'tag' => false);
}
/**
* Migrates entries from table {log} into {block_recent_activity}
*
* We only migrate logs for the courses that actually have recent activity
* block and that are being viewed within COURSE_MAX_RECENT_PERIOD time
* after the upgrade.
*
* The presence of entry in {block_recent_activity} with the cmid=0 indicates
* that the course needs log migration. Those entries were installed in
* db/upgrade.php when the table block_recent_activity was created.
*
* @param stdClass $course
*/
protected static function migrate_logs($course) {
global $DB;
if (!$logstarted = $DB->get_record('block_recent_activity',
array('courseid' => $course->id, 'cmid' => 0),
'id, timecreated')) {
return;
}
$DB->delete_records('block_recent_activity', array('id' => $logstarted->id));
try {
$logs = $DB->get_records_select('log',
"time > ? AND time < ? AND course = ? AND
module = 'course' AND
(action = 'add mod' OR action = 'update mod' OR action = 'delete mod')",
array(time()-COURSE_MAX_RECENT_PERIOD, $logstarted->timecreated, $course->id),
'id ASC', 'id, time, userid, cmid, action, info');
} catch (Exception $e) {
// Probably table {log} was already removed.
return;
}
if (!$logs) {
return;
}
$modinfo = get_fast_modinfo($course);
$entries = array();
foreach ($logs as $log) {
$info = explode(' ', $log->info);
if (count($info) != 2) {
continue;
}
$modname = $info[0];
$instanceid = $info[1];
$entry = array('courseid' => $course->id, 'userid' => $log->userid,
'timecreated' => $log->time, 'modname' => $modname);
if ($log->action == 'delete mod') {
if (!$log->cmid) {
continue;
}
$entry['action'] = 2;
$entry['cmid'] = $log->cmid;
} else {
if (!isset($modinfo->instances[$modname][$instanceid])) {
continue;
}
if ($log->action == 'add mod') {
$entry['action'] = 0;
} else {
$entry['action'] = 1;
}
$entry['cmid'] = $modinfo->instances[$modname][$instanceid]->id;
}
$entries[] = $entry;
}
$DB->insert_records('block_recent_activity', $entries);
}
}