/**
 * Get a list of essential user navigation items.
 *
 * @param stdclass $user user object.
 * @param moodle_page $page page object.
 * @return stdClass $returnobj navigation information object, where:
 *
 *      $returnobj->navitems    array    array of links where each link is a
 *                                       stdClass with fields url, title, and
 *                                       pix
 *      $returnobj->metadata    array    array of useful user metadata to be
 *                                       used when constructing navigation;
 *                                       fields include:
 *
 *          ROLE FIELDS
 *          asotherrole    bool    whether viewing as another role
 *          rolename       string  name of the role
 *
 *          USER FIELDS
 *          These fields are for the currently-logged in user, or for
 *          the user that the real user is currently logged in as.
 *
 *          userid         int        the id of the user in question
 *          userfullname   string     the user's full name
 *          userprofileurl moodle_url the url of the user's profile
 *          useravatar     string     a HTML fragment - the rendered
 *                                    user_picture for this user
 *          userloginfail  string     an error string denoting the number
 *                                    of login failures since last login
 *
 *          "REAL USER" FIELDS
 *          These fields are for when asotheruser is true, and
 *          correspond to the underlying "real user".
 *
 *          asotheruser        bool    whether viewing as another user
 *          realuserid         int        the id of the user in question
 *          realuserfullname   string     the user's full name
 *          realuserprofileurl moodle_url the url of the user's profile
 *          realuseravatar     string     a HTML fragment - the rendered
 *                                        user_picture for this user
 *
 *          MNET PROVIDER FIELDS
 *          asmnetuser            bool   whether viewing as a user from an
 *                                       MNet provider
 *          mnetidprovidername    string name of the MNet provider
 *          mnetidproviderwwwroot string URL of the MNet provider
 */
function user_get_user_navigation_info($user, $page)
{
    global $OUTPUT, $DB, $SESSION, $CFG;
    $returnobject = new stdClass();
    $returnobject->navitems = array();
    $returnobject->metadata = array();
    $course = $page->course;
    // Query the environment.
    $context = context_course::instance($course->id);
    // Get basic user metadata.
    $returnobject->metadata['userid'] = $user->id;
    $returnobject->metadata['userfullname'] = fullname($user, true);
    $returnobject->metadata['userprofileurl'] = new moodle_url('/user/profile.php', array('id' => $user->id));
    $returnobject->metadata['useravatar'] = $OUTPUT->user_picture($user, array('link' => false, 'visibletoscreenreaders' => false));
    // Build a list of items for a regular user.
    // Query MNet status.
    if ($returnobject->metadata['asmnetuser'] = is_mnet_remote_user($user)) {
        $mnetidprovider = $DB->get_record('mnet_host', array('id' => $user->mnethostid));
        $returnobject->metadata['mnetidprovidername'] = $mnetidprovider->name;
        $returnobject->metadata['mnetidproviderwwwroot'] = $mnetidprovider->wwwroot;
    }
    // Did the user just log in?
    if (isset($SESSION->justloggedin)) {
        // Don't unset this flag as login_info still needs it.
        if (!empty($CFG->displayloginfailures)) {
            // We're already in /user/lib.php, so we don't need to include.
            if ($count = user_count_login_failures($user)) {
                // Get login failures string.
                $a = new stdClass();
                $a->attempts = html_writer::tag('span', $count, array('class' => 'value'));
                $returnobject->metadata['userloginfail'] = get_string('failedloginattempts', '', $a);
            }
        }
    }
    // Links: Dashboard.
    $myhome = new stdClass();
    $myhome->itemtype = 'link';
    $myhome->url = new moodle_url('/my/');
    $myhome->title = get_string('mymoodle', 'admin');
    $myhome->pix = "i/course";
    $returnobject->navitems[] = $myhome;
    // Links: My Profile.
    $myprofile = new stdClass();
    $myprofile->itemtype = 'link';
    $myprofile->url = new moodle_url('/user/profile.php', array('id' => $user->id));
    $myprofile->title = get_string('profile');
    $myprofile->pix = "i/user";
    $returnobject->navitems[] = $myprofile;
    // Links: Role-return or logout link.
    $lastobj = null;
    $buildlogout = true;
    $returnobject->metadata['asotherrole'] = false;
    if (is_role_switched($course->id)) {
//.........这里部分代码省略.........

    /**
     * Return the standard string that says whether you are logged in (and switched
     * roles/logged in as another user).
     * @param bool $withlinks if false, then don't include any links in the HTML produced.
     * If not set, the default is the nologinlinks option from the theme config.php file,
     * and if that is not set, then links are included.
     * @return string HTML fragment.
     */
    public function login_info($withlinks = null) {
        global $USER, $CFG, $DB, $SESSION;

        if (during_initial_install()) {
            return '';
        }

        if (is_null($withlinks)) {
            $withlinks = empty($this->page->layout_options['nologinlinks']);
        }

        $course = $this->page->course;
        if (\core\session\manager::is_loggedinas()) {
            $realuser = \core\session\manager::get_realuser();
            $fullname = fullname($realuser, true);
            if ($withlinks) {
                $loginastitle = get_string('loginas');
                $realuserinfo = " [<a href=\"$CFG->wwwroot/course/loginas.php?id=$course->id&amp;sesskey=".sesskey()."\"";
                $realuserinfo .= "title =\"".$loginastitle."\">$fullname</a>] ";
            } else {
                $realuserinfo = " [$fullname] ";
            }
        } else {
            $realuserinfo = '';
        }

        $loginpage = $this->is_login_page();
        $loginurl = get_login_url();

        if (empty($course->id)) {
            // $course->id is not defined during installation
            return '';
        } else if (isloggedin()) {
            $context = context_course::instance($course->id);

            $fullname = fullname($USER, true);
            // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
            if ($withlinks) {
                $linktitle = get_string('viewprofile');
                $username = "<a href=\"$CFG->wwwroot/user/profile.php?id=$USER->id\" title=\"$linktitle\">$fullname</a>";
            } else {
                $username = $fullname;
            }
            if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id'=>$USER->mnethostid))) {
                if ($withlinks) {
                    $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
                } else {
                    $username .= " from {$idprovider->name}";
                }
            }
            if (isguestuser()) {
                $loggedinas = $realuserinfo.get_string('loggedinasguest');
                if (!$loginpage && $withlinks) {
                    $loggedinas .= " (<a href=\"$loginurl\">".get_string('login').'</a>)';
                }
            } else if (is_role_switched($course->id)) { // Has switched roles
                $rolename = '';
                if ($role = $DB->get_record('role', array('id'=>$USER->access['rsw'][$context->path]))) {
                    $rolename = ': '.role_get_name($role, $context);
                }
                $loggedinas = get_string('loggedinas', 'moodle', $username).$rolename;
                if ($withlinks) {
                    $url = new moodle_url('/course/switchrole.php', array('id'=>$course->id,'sesskey'=>sesskey(), 'switchrole'=>0, 'returnurl'=>$this->page->url->out_as_local_url(false)));
                    $loggedinas .= ' ('.html_writer::tag('a', get_string('switchrolereturn'), array('href' => $url)).')';
                }
            } else {
                $loggedinas = $realuserinfo.get_string('loggedinas', 'moodle', $username);
                if ($withlinks) {
                    $loggedinas .= " (<a href=\"$CFG->wwwroot/login/logout.php?sesskey=".sesskey()."\">".get_string('logout').'</a>)';
                }
            }
        } else {
            $loggedinas = get_string('loggedinnot', 'moodle');
            if (!$loginpage && $withlinks) {
                $loggedinas .= " (<a href=\"$loginurl\">".get_string('login').'</a>)';
            }
        }

        $loggedinas = '<div class="logininfo">'.$loggedinas.'</div>';

        if (isset($SESSION->justloggedin)) {
            unset($SESSION->justloggedin);
            if (!empty($CFG->displayloginfailures)) {
                if (!isguestuser()) {
                    // Include this file only when required.
                    require_once($CFG->dirroot . '/user/lib.php');
                    if ($count = user_count_login_failures($USER)) {
                        $loggedinas .= '<div class="loginfailures">';
                        $a = new stdClass();
                        $a->attempts = $count;
                        $loggedinas .= get_string('failedloginattempts', '', $a);
                        if (file_exists("$CFG->dirroot/report/log/index.php") and has_capability('report/log:view', context_system::instance())) {
//.........这里部分代码省略.........

 /**
  * Start output by sending the HTTP headers, and printing the HTML <head>
  * and the start of the <body>.
  *
  * To control what is printed, you should set properties on $PAGE. If you
  * are familiar with the old {@link print_header()} function from Moodle 1.9
  * you will find that there are properties on $PAGE that correspond to most
  * of the old parameters to could be passed to print_header.
  *
  * Not that, in due course, the remaining $navigation, $menu parameters here
  * will be replaced by more properties of $PAGE, but that is still to do.
  *
  * @return string HTML that you must output this, preferably immediately.
  */
 public function header()
 {
     global $USER, $CFG, $SESSION;
     if (\core\session\manager::is_loggedinas()) {
         $this->page->add_body_class('userloggedinas');
     }
     if (isset($SESSION->justloggedin) && !empty($CFG->displayloginfailures)) {
         require_once $CFG->dirroot . '/user/lib.php';
         // Set second parameter to false as we do not want reset the counter, the same message appears on footer.
         if ($count = user_count_login_failures($USER, false)) {
             $this->page->add_body_class('loginfailures');
         }
     }
     // If the user is logged in, and we're not in initial install,
     // check to see if the user is role-switched and add the appropriate
     // CSS class to the body element.
     if (!during_initial_install() && isloggedin() && is_role_switched($this->page->course->id)) {
         $this->page->add_body_class('userswitchedrole');
     }
     // Give themes a chance to init/alter the page object.
     $this->page->theme->init_page($this->page);
     $this->page->set_state(moodle_page::STATE_PRINTING_HEADER);
     // Find the appropriate page layout file, based on $this->page->pagelayout.
     $layoutfile = $this->page->theme->layout_file($this->page->pagelayout);
     // Render the layout using the layout file.
     $rendered = $this->render_page_layout($layoutfile);
     // Slice the rendered output into header and footer.
     $cutpos = strpos($rendered, $this->unique_main_content_token);
     if ($cutpos === false) {
         $cutpos = strpos($rendered, self::MAIN_CONTENT_TOKEN);
         $token = self::MAIN_CONTENT_TOKEN;
     } else {
         $token = $this->unique_main_content_token;
     }
     if ($cutpos === false) {
         throw new coding_exception('page layout file ' . $layoutfile . ' does not contain the main content placeholder, please include "<?php echo $OUTPUT->main_content() ?>" in theme layout file.');
     }
     $header = substr($rendered, 0, $cutpos);
     $footer = substr($rendered, $cutpos + strlen($token));
     if (empty($this->contenttype)) {
         debugging('The page layout file did not call $OUTPUT->doctype()');
         $header = $this->doctype() . $header;
     }
     // If this theme version is below 2.4 release and this is a course view page
     if ((!isset($this->page->theme->settings->version) || $this->page->theme->settings->version < 2012101500) && $this->page->pagelayout === 'course' && $this->page->url->compare(new moodle_url('/course/view.php'), URL_MATCH_BASE)) {
         // check if course content header/footer have not been output during render of theme layout
         $coursecontentheader = $this->course_content_header(true);
         $coursecontentfooter = $this->course_content_footer(true);
         if (!empty($coursecontentheader)) {
             // display debug message and add header and footer right above and below main content
             // Please note that course header and footer (to be displayed above and below the whole page)
             // are not displayed in this case at all.
             // Besides the content header and footer are not displayed on any other course page
             debugging('The current theme is not optimised for 2.4, the course-specific header and footer defined in course format will not be output', DEBUG_DEVELOPER);
             $header .= $coursecontentheader;
             $footer = $coursecontentfooter . $footer;
         }
     }
     send_headers($this->contenttype, $this->page->cacheable);
     $this->opencontainers->push('header/footer', $footer);
     $this->page->set_state(moodle_page::STATE_IN_BODY);
     return $header . $this->skip_link_target('maincontent');
 }

 /**
  * Test function user_count_login_failures().
  */
 public function test_user_count_login_failures()
 {
     $this->resetAfterTest();
     $user = $this->getDataGenerator()->create_user();
     $this->assertEquals(0, get_user_preferences('login_failed_count_since_success', 0, $user));
     for ($i = 0; $i < 10; $i++) {
         login_attempt_failed($user);
     }
     $this->assertEquals(10, get_user_preferences('login_failed_count_since_success', 0, $user));
     $count = user_count_login_failures($user);
     // Reset count.
     $this->assertEquals(10, $count);
     $this->assertEquals(0, get_user_preferences('login_failed_count_since_success', 0, $user));
     for ($i = 0; $i < 10; $i++) {
         login_attempt_failed($user);
     }
     $this->assertEquals(10, get_user_preferences('login_failed_count_since_success', 0, $user));
     $count = user_count_login_failures($user, false);
     // Do not reset count.
     $this->assertEquals(10, $count);
     $this->assertEquals(10, get_user_preferences('login_failed_count_since_success', 0, $user));
 }

 /**
  * Return the standard string that says whether you are logged in (and switched
  * roles/logged in as another user).
  * @param bool $withlinks if false, then don't include any links in the HTML produced.
  * If not set, the default is the nologinlinks option from the theme config.php file,
  * and if that is not set, then links are included.
  * @return string HTML fragment.
  */
 public function login_info($withlinks = null)
 {
     global $USER, $CFG, $DB, $SESSION;
     if (during_initial_install()) {
         return '';
     }
     if (is_null($withlinks)) {
         $withlinks = empty($this->page->layout_options['nologinlinks']);
     }
     $loginpage = (string) $this->page->url === get_login_url();
     $course = $this->page->course;
     if (\core\session\manager::is_loggedinas()) {
         $realuser = session_get_realuser();
         $fullname = fullname($realuser, true);
         if ($withlinks) {
             $realuserinfo = " [<a href=\"{$CFG->wwwroot}/course/loginas.php?id={$course->id}&amp;sesskey=" . sesskey() . "\">{$fullname}</a>] ";
         } else {
             $realuserinfo = " [{$fullname}] ";
         }
     } else {
         $realuserinfo = '';
     }
     $loginurl = get_login_url();
     if (empty($course->id)) {
         // $course->id is not defined during installation
         return '';
     } else {
         if (isloggedin()) {
             $context = context_course::instance($course->id);
             $fullname = fullname($USER, true);
             // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
             if ($withlinks) {
                 $username = "<a href=\"{$CFG->wwwroot}/user/profile.php?id={$USER->id}\">{$fullname}</a>";
             } else {
                 $username = $fullname;
             }
             if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id' => $USER->mnethostid))) {
                 if ($withlinks) {
                     $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
                 } else {
                     $username .= " from {$idprovider->name}";
                 }
             }
             if (isguestuser()) {
                 $loggedinas = $realuserinfo . get_string('loggedinasguest');
                 if (!$loginpage && $withlinks) {
                     $loggedinas .= '<a class="btn btn-small btn-default" href="' . $loginurl . '"><i class="fa fa-sign-in"></i> ' . get_string('login') . '</a>';
                 }
             } else {
                 if (is_role_switched($course->id)) {
                     // Has switched roles
                     $rolename = '';
                     if ($role = $DB->get_record('role', array('id' => $USER->access['rsw'][$context->path]))) {
                         $rolename = ': ' . format_string($role->name);
                     }
                     $loggedinas = get_string('loggedinas', 'moodle', $username) . $rolename;
                     if ($withlinks) {
                         $loggedinas .= ' (<a href="$CFG->wwwroot/course/view.php?id=$course->id&amp;switchrole=0&amp;sesskey=' . sesskey() . '">' . get_string('switchrolereturn') . '</a>)';
                     }
                 } else {
                     $loggedinas = $realuserinfo . get_string('loggedinas', 'moodle', $username);
                     if ($withlinks) {
                         $loggedinas .= '&nbsp;&nbsp;<a class="btn btn-small" href="' . $CFG->wwwroot . '/login/logout.php?sesskey=' . sesskey() . '"><i class="fa fa-sign-out"></i> ' . get_string('logout') . '</a>';
                     }
                 }
             }
         } else {
             $loggedinas = get_string('loggedinnot', 'moodle');
             if (!$loginpage && $withlinks) {
                 $loggedinas .= ' <a class="btn btn-small btn-default" href="' . $loginurl . '"><i class="fa fa-sign-in"></i> ' . get_string('login') . '</a>';
             }
         }
     }
     $loggedinas = '<div class="logininfo">' . $loggedinas . '</div>';
     if (isset($SESSION->justloggedin)) {
         unset($SESSION->justloggedin);
         if (!empty($CFG->displayloginfailures)) {
             if (!isguestuser()) {
                 // Include this file only when required.
                 require_once $CFG->dirroot . '/user/lib.php';
                 if ($count = user_count_login_failures($USER)) {
                     $loggedinas .= '<div class="loginfailures">';
                     $a = new stdClass();
                     $a->attempts = $count;
                     $loggedinas .= get_string('failedloginattempts', '', $a);
                     if (file_exists("{$CFG->dirroot}/report/log/index.php") and has_capability('report/log:view', context_system::instance())) {
                         $loggedinas .= ' (' . html_writer::link(new moodle_url('/report/log/index.php', array('chooselog' => 1, 'id' => 0, 'modid' => 'site_errors')), get_string('logs')) . ')';
                     }
                     $loggedinas .= '</div>';
                 }
             }
         }
//.........这里部分代码省略.........