user_settings.php

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<?php
function _elgg_set_user_password() {
    $current_password = get_input('current_password', null, false);
    $password = get_input('password', null, false);
    $password2 = get_input('password2', null, false);
    $user_guid = get_input('guid');

    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if ($user && $password) {
        // let admin user change anyone's password without knowing it except his own.
        if (!elgg_is_admin_logged_in() || elgg_is_admin_logged_in() && $user->guid == elgg_get_logged_in_user_guid()) {
            $credentials = array(
                'username' => $user->username,
                'password' => $current_password
            );

            try {
                pam_auth_userpass($credentials);
            } catch (LoginException $e) {
                register_error(elgg_echo('LoginException:ChangePasswordFailure'));
                return false;
            }
        }

        try {
            $result = validate_password($password);
        } catch (RegistrationException $e) {
            register_error($e->getMessage());
            return false;
        }

        if ($result) {
            if ($password == $password2) {
                $user->setPassword($password);
                _elgg_services()->persistentLogin->handlePasswordChange($user, elgg_get_logged_in_user_entity());

                if ($user->save()) {
                    system_message(elgg_echo('user:password:success'));
                    return true;
                } else {
                    register_error(elgg_echo('user:password:fail'));
                }
            } else {
                register_error(elgg_echo('user:password:fail:notsame'));
            }
        } else {
            register_error(elgg_echo('user:password:fail:tooshort'));
        }
    } else {
        // no change
        return;
    }

    return false;
}

function _elgg_set_user_name() {
    $name = get_input('name');
    $user_guid = get_input('guid');

    if (!isset($name)) {
        return;
    }

    $name = strip_tags($name);
    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if (elgg_strlen($name) > 50) {
        register_error(elgg_echo('user:name:fail'));
        return false;
    }

    if ($user && $user->canEdit() && $name) {
        if ($name != $user->name) {
            $user->name = $name;
            if ($user->save()) {
                system_message(elgg_echo('user:name:success'));
                return true;
            } else {
                register_error(elgg_echo('user:name:fail'));
            }
        } else {
            // no change
            return;
        }
    } else {
        register_error(elgg_echo('user:name:fail'));
    }
    return false;
}

function _elgg_set_user_language() {
    $language = get_input('language');
    $user_guid = get_input('guid');

    if (!isset($language)) {
        return;
    }
    
    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if ($user && $language) {
        if (strcmp($language, $user->language) != 0) {
            $user->language = $language;
            if ($user->save()) {
                system_message(elgg_echo('user:language:success'));
                return true;
            } else {
                register_error(elgg_echo('user:language:fail'));
            }
        } else {
            // no change
            return;
        }
    } else {
        register_error(elgg_echo('user:language:fail'));
    }
    return false;
}

function _elgg_set_user_email() {
    $email = get_input('email');
    $user_guid = get_input('guid');

    if (!isset($email)) {
        return;
    }
    
    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if (!is_email_address($email)) {
        register_error(elgg_echo('email:save:fail'));
        return false;
    }

    if ($user) {
        if (strcmp($email, $user->email) != 0) {
            if (!get_user_by_email($email)) {
                if ($user->email != $email) {

                    $user->email = $email;
                    if ($user->save()) {
                        system_message(elgg_echo('email:save:success'));
                        return true;
                    } else {
                        register_error(elgg_echo('email:save:fail'));
                    }
                }
            } else {
                register_error(elgg_echo('registration:dupeemail'));
            }
        } else {
            // no change
            return;
        }
    } else {
        register_error(elgg_echo('email:save:fail'));
    }
    return false;
}

function _elgg_set_user_default_access() {

    if (!elgg_get_config('allow_user_default_access')) {
        return;
    }

    $default_access = get_input('default_access');
    $user_guid = get_input('guid');

    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if ($user) {
        $current_default_access = $user->getPrivateSetting('elgg_default_access');
        if ($default_access !== $current_default_access) {
            if ($user->setPrivateSetting('elgg_default_access', $default_access)) {
                system_message(elgg_echo('user:default_access:success'));
                return true;
            } else {
                register_error(elgg_echo('user:default_access:failure'));
            }
        } else {
            // no change
            return;
        }
    } else {
        register_error(elgg_echo('user:default_access:failure'));
    }

    return false;
}

function _elgg_user_settings_menu_setup() {
    $user = elgg_get_page_owner_entity();

    if (!$user) {
        return;
    }

    if (!elgg_in_context("settings")) {
        return;
    }
    
    $params = array(
        'name' => '1_account',
        'text' => elgg_echo('usersettings:user:opt:linktext'),
        'href' => "settings/user/{$user->username}",
        'section' => 'configure',
    );
    elgg_register_menu_item('page', $params);
    $params = array(
        'name' => '1_plugins',
        'text' => elgg_echo('usersettings:plugins:opt:linktext'),
        'href' => '#',
        'section' => 'configure',
    );
    elgg_register_menu_item('page', $params);
    $params = array(
        'name' => '1_statistics',
        'text' => elgg_echo('usersettings:statistics:opt:linktext'),
        'href' => "settings/statistics/{$user->username}",
        'section' => 'configure',
    );
    elgg_register_menu_item('page', $params);
    
    // register plugin user settings menu items
    $active_plugins = elgg_get_plugins();
    
    foreach ($active_plugins as $plugin) {
        $plugin_id = $plugin->getID();
        if (elgg_view_exists("usersettings/$plugin_id/edit") || elgg_view_exists("plugins/$plugin_id/usersettings")) {
            if (elgg_language_key_exists($plugin_id . ':usersettings:title')) {
                $title = elgg_echo($plugin_id . ':usersettings:title');
            } else {
                $title = $plugin->getFriendlyName();
            }
            $params = array(
                'name' => $plugin_id,
                'text' => $title,
                'href' => "settings/plugins/{$user->username}/$plugin_id",
                'parent_name' => '1_plugins',
                'section' => 'configure',
            );
            elgg_register_menu_item('page', $params);
        }
    }
    
    elgg_register_plugin_hook_handler("prepare", "menu:page", "_elgg_user_settings_menu_prepare");
}

function _elgg_user_settings_menu_prepare($hook, $type, $value, $params) {
    if (empty($value)) {
        return $value;
    }
    
    if (!elgg_in_context("settings")) {
        return $value;
    }
    
    $configure = elgg_extract("configure", $value);
    if (empty($configure)) {
        return $value;
    }   
    
    foreach ($configure as $index => $menu_item) {
        if (!($menu_item instanceof ElggMenuItem)) {
            continue;   
        }
        
        if ($menu_item->getName() == "1_plugins") {
            if (!$menu_item->getChildren()) {
                // no need for this menu item if it has no children
                unset($value["configure"][$index]); 
            }
        }
    }
    
    return $value;
}

function _elgg_user_settings_page_handler($page) {
    if (!isset($page[0])) {
        $page[0] = 'user';
    }

    if (isset($page[1])) {
        $user = get_user_by_username($page[1]);
        elgg_set_page_owner_guid($user->guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
        elgg_set_page_owner_guid($user->guid);
    }

    $vars['username'] = $user->username;

    switch ($page[0]) {
        case 'statistics':
            echo elgg_view_resource('settings/statistics', $vars);
            return true;
        case 'plugins':
            if (isset($page[2])) {
                $vars['plugin_id'] = $page[2];
                echo elgg_view_resource('settings/tools', $vars);
                return true;
            }
            break;
        case 'user':
            echo elgg_view_resource("settings/account", $vars);
            return true;
    }

    return false;
}

function _elgg_user_settings_init() {
    elgg_register_page_handler('settings', '_elgg_user_settings_page_handler');

    elgg_register_event_handler('pagesetup', 'system', '_elgg_user_settings_menu_setup');

    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_language');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_password');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_default_access');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_name');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_email');
    
    elgg_register_action("usersettings/save");

    // extend the account settings form
    elgg_extend_view('forms/account/settings', 'core/settings/account/name', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/password', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/email', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/language', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/default_access', 100);
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $events->registerHandler('init', 'system', '_elgg_user_settings_init');
};