views.php

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<?php
use Elgg\Menu\Menu;
use Elgg\Menu\UnpreparedMenu;

global $CURRENT_SYSTEM_VIEWTYPE;
$CURRENT_SYSTEM_VIEWTYPE = "";

function elgg_set_viewtype($viewtype = "") {
    global $CURRENT_SYSTEM_VIEWTYPE;

    $CURRENT_SYSTEM_VIEWTYPE = $viewtype;

    return true;
}

function elgg_get_viewtype() {
    global $CURRENT_SYSTEM_VIEWTYPE;

    if (empty($CURRENT_SYSTEM_VIEWTYPE)) {
        $CURRENT_SYSTEM_VIEWTYPE = _elgg_get_initial_viewtype();
    }

    return $CURRENT_SYSTEM_VIEWTYPE;
}

function _elgg_get_initial_viewtype() {
    global $CONFIG;

    $viewtype = get_input('view', '', false);
    if (_elgg_is_valid_viewtype($viewtype)) {
        return $viewtype;
    }

    if (isset($CONFIG->view) && _elgg_is_valid_viewtype($CONFIG->view)) {
        return $CONFIG->view;
    }

    return 'default';
}

function elgg_register_viewtype($viewtype) {
    if (!isset($GLOBALS['_ELGG']->view_types) || !is_array($GLOBALS['_ELGG']->view_types)) {
        $GLOBALS['_ELGG']->view_types = array();
    }

    if (!in_array($viewtype, $GLOBALS['_ELGG']->view_types)) {
        $GLOBALS['_ELGG']->view_types[] = $viewtype;
    }

    return true;
}

function elgg_is_registered_viewtype($viewtype) {
    if (!isset($GLOBALS['_ELGG']->view_types) || !is_array($GLOBALS['_ELGG']->view_types)) {
        return false;
    }

    return in_array($viewtype, $GLOBALS['_ELGG']->view_types);
}


function _elgg_is_valid_viewtype($viewtype) {
    if (!is_string($viewtype) || $viewtype === '') {
        return false;
    }

    if (preg_match('/\W/', $viewtype)) {
        return false;
    }

    return true;
}

function elgg_register_viewtype_fallback($viewtype) {
    _elgg_services()->views->registerViewtypeFallback($viewtype);
}

function elgg_does_viewtype_fallback($viewtype) {
    return _elgg_services()->views->doesViewtypeFallback($viewtype);
}

function elgg_register_ajax_view($view) {
    elgg_register_external_view($view, false);
}

function elgg_unregister_ajax_view($view) {
    elgg_unregister_external_view($view);
}

function elgg_register_external_view($view, $cacheable = false) {
    if (!isset($GLOBALS['_ELGG']->allowed_ajax_views)) {
        $GLOBALS['_ELGG']->allowed_ajax_views = array();
    }

    $GLOBALS['_ELGG']->allowed_ajax_views[$view] = true;

    if ($cacheable) {
        _elgg_services()->views->registerCacheableView($view);
    }
}

function elgg_unregister_external_view($view) {
    if (isset($GLOBALS['_ELGG']->allowed_ajax_views[$view])) {
        unset($GLOBALS['_ELGG']->allowed_ajax_views[$view]);
    }
}

function elgg_set_view_location($view, $location, $viewtype = '') {
    _elgg_services()->views->setViewDir($view, $location, $viewtype);
}

function elgg_view_exists($view, $viewtype = '', $recurse = true) {
    return _elgg_services()->views->viewExists($view, $viewtype, $recurse);
}

function elgg_list_views($viewtype = 'default') {
    return _elgg_services()->views->listViews($viewtype);
}

function elgg_view($view, $vars = array(), $ignore1 = false, $ignore2 = false, $viewtype = '') {
    return _elgg_services()->views->renderView($view, $vars, $ignore1, $viewtype);
}

function elgg_view_deprecated($view, array $vars, $suggestion, $version) {
    return _elgg_services()->views->renderDeprecatedView($view, $vars, $suggestion, $version);
}

function elgg_extend_view($view, $view_extension, $priority = 501) {
    _elgg_services()->views->extendView($view, $view_extension, $priority);
}

function elgg_unextend_view($view, $view_extension) {
    return _elgg_services()->views->unextendView($view, $view_extension);
}

function elgg_prepend_css_urls($css, $path) {
    return Minify_CSS_UriRewriter::prepend($css, $path);
}

function elgg_view_page($title, $body, $page_shell = 'default', $vars = array()) {
    $timer = _elgg_services()->timer;
    if (!$timer->hasEnded(['build page'])) {
        $timer->end(['build page']);
    }
    $timer->begin([__FUNCTION__]);

    $params = array();
    $params['identifier'] = _elgg_services()->request->getFirstUrlSegment();
    $params['segments'] = _elgg_services()->request->getUrlSegments();
    array_shift($params['segments']);
    $page_shell = elgg_trigger_plugin_hook('shell', 'page', $params, $page_shell);


    $system_messages = _elgg_services()->systemMessages;

    $messages = null;
    if ($system_messages->count()) {
        $messages = $system_messages->dumpRegister();

        if (isset($messages['error'])) {
            // always make sure error is the first type
            $errors = array(
                'error' => $messages['error']
            );

            unset($messages['error']);
            $messages = array_merge($errors, $messages);
        }
    }

    $vars['title'] = $title;
    $vars['body'] = $body;
    $vars['sysmessages'] = $messages;

    // head has keys 'title', 'metas', 'links'
    $head_params = _elgg_views_prepare_head($title);

    $vars['head'] = elgg_trigger_plugin_hook('head', 'page', $vars, $head_params);

    $vars = elgg_trigger_plugin_hook('output:before', 'page', null, $vars);

    $output = elgg_view("page/$page_shell", $vars);

    $vars['page_shell'] = $page_shell;

    // Allow plugins to modify the output
    $output = elgg_trigger_plugin_hook('output', 'page', $vars, $output);

    $timer->end([__FUNCTION__]);
    return $output;
}

function elgg_view_resource($name, array $vars = []) {
    $view = "resources/$name";

    if (elgg_view_exists($view)) {
        return _elgg_services()->views->renderView($view, $vars);
    }

    if (elgg_get_viewtype() !== 'default' && elgg_view_exists($view, 'default')) {
        return _elgg_services()->views->renderView($view, $vars, false, 'default');
    }

    _elgg_services()->logger->error("The view $view is missing.");

    if (elgg_get_viewtype() === 'default') {
        // only works for default viewtype
        forward('', '404');
    } else {
        register_error(elgg_echo('error:404:content'));
        forward('');
    }
}

function _elgg_views_prepare_head($title) {
    $params = array(
        'links' => array(),
        'metas' => array(),
    );

    if (empty($title)) {
        $params['title'] = elgg_get_config('sitename');
    } else {
        $params['title'] = $title . ' : ' . elgg_get_config('sitename');
    }

    $params['metas']['content-type'] = array(
        'http-equiv' => 'Content-Type',
        'content' => 'text/html; charset=utf-8',
    );

    $params['metas']['description'] = array(
        'name' => 'description',
        'content' => elgg_get_config('sitedescription')
    );

    // https://developer.chrome.com/multidevice/android/installtohomescreen
    $params['metas']['viewport'] = array(
        'name' => 'viewport',
        'content' => 'width=device-width',
    );
    $params['metas']['mobile-web-app-capable'] = array(
        'name' => 'mobile-web-app-capable',
        'content' => 'yes',
    );
    $params['metas']['apple-mobile-web-app-capable'] = array(
        'name' => 'apple-mobile-web-app-capable',
        'content' => 'yes',
    );
    
    // RSS feed link
    if (_elgg_has_rss_link()) {
        $url = current_page_url();
        if (substr_count($url,'?')) {
            $url .= "&view=rss";
        } else {
            $url .= "?view=rss";
        }
        $params['links']['rss'] = array(
            'rel' => 'alternative',
            'type' => 'application/rss+xml',
            'title' => 'RSS',
            'href' => elgg_format_url($url),
        );
    }
    
    return $params;
}


function _elgg_views_prepare_favicon_links($hook, $type, $head_params, $params) {

    $head_params['links']['apple-touch-icon'] = array(
        'rel' => 'apple-touch-icon',
        'href' => elgg_get_simplecache_url('favicon-128.png'),
    );

    // favicons
    $head_params['links']['icon-ico'] = array(
        'rel' => 'icon',
        'href' => elgg_get_simplecache_url('favicon.ico'),
    );
    $head_params['links']['icon-vector'] = array(
        'rel' => 'icon',
        'sizes' => '16x16 32x32 48x48 64x64 128x128',
        'type' => 'image/svg+xml',
        'href' => elgg_get_simplecache_url('favicon.svg'),
    );
    $head_params['links']['icon-16'] = array(
        'rel' => 'icon',
        'sizes' => '16x16',
        'type' => 'image/png',
        'href' => elgg_get_simplecache_url('favicon-16.png'),
    );
    $head_params['links']['icon-32'] = array(
        'rel' => 'icon',
        'sizes' => '32x32',
        'type' => 'image/png',
        'href' => elgg_get_simplecache_url('favicon-32.png'),
    );
    $head_params['links']['icon-64'] = array(
        'rel' => 'icon',
        'sizes' => '64x64',
        'type' => 'image/png',
        'href' => elgg_get_simplecache_url('favicon-64.png'),
    );
    $head_params['links']['icon-128'] = array(
        'rel' => 'icon',
        'sizes' => '128x128',
        'type' => 'image/png',
        'href' => elgg_get_simplecache_url('favicon-128.png'),
    );

    return $head_params;
}

function elgg_view_layout($layout_name, $vars = array()) {
    $timer = _elgg_services()->timer;
    if (!$timer->hasEnded(['build page'])) {
        $timer->end(['build page']);
    }
    $timer->begin([__FUNCTION__]);

    $params = array();
    $params['identifier'] = _elgg_services()->request->getFirstUrlSegment();
    $params['segments'] = _elgg_services()->request->getUrlSegments();
    array_shift($params['segments']);
    $layout_name = elgg_trigger_plugin_hook('layout', 'page', $params, $layout_name);

    $param_array = $vars;

    $param_array['layout'] = $layout_name;

    $params = elgg_trigger_plugin_hook('output:before', 'layout', null, $param_array);

    if (elgg_view_exists("page/layouts/$layout_name")) {
        $output = elgg_view("page/layouts/$layout_name", $params);
    } else {
        $output = elgg_view("page/layouts/default", $params);
    }

    $output = elgg_trigger_plugin_hook('output:after', 'layout', $params, $output);

    $timer->end([__FUNCTION__]);
    return $output;
}

function elgg_view_menu($menu, array $vars = array()) {
    if (is_string($menu)) {
        $menu = _elgg_services()->menus->getMenu($menu, $vars);

    } elseif ($menu instanceof UnpreparedMenu) {
        $menu = _elgg_services()->menus->prepareMenu($menu);
    }

    if (!$menu instanceof Menu) {
        throw new \InvalidArgumentException('$menu must be a menu name, a Menu, or UnpreparedMenu');
    }

    $name = $menu->getName();

    if (elgg_view_exists("navigation/menu/$name")) {
        return elgg_view("navigation/menu/$name", $menu->getParams());
    } else {
        return elgg_view("navigation/menu/default", $menu->getParams());
    }
}

function elgg_view_menu_item(\ElggMenuItem $item, array $vars = array()) {
    if (!isset($vars['class'])) {
        $vars['class'] = 'elgg-menu-content';
    }

    $vars = array_merge($item->getValues(), $vars);

    if ($item->getLinkClass()) {
        $vars['class'] .= ' ' . $item->getLinkClass();
    }

    if ($item->getHref() === false || $item->getHref() === null) {
        $text = $item->getText();

        // if contains elements, don't wrap
        if (preg_match('~<[a-z]~', $text)) {
            return $text;
        } else {
            return elgg_format_element('span', array('class' => 'elgg-non-link'), $text);
        }
    }

    if (!isset($vars['rel']) && !isset($vars['is_trusted'])) {
        $vars['is_trusted'] = true;
    }

    if ($item->getConfirmText()) {
        $vars['confirm'] = $item->getConfirmText();
    }

    return elgg_view('output/url', $vars);
}

function elgg_view_entity(\ElggEntity $entity, array $vars = array(), $bypass = false, $debug = false) {

    // No point continuing if entity is null
    if (!$entity || !($entity instanceof \ElggEntity)) {
        return false;
    }

    elgg_register_rss_link();

    $defaults = array(
        'full_view' => true,
    );

    $vars = array_merge($defaults, $vars);

    $vars['entity'] = $entity;

    $entity_type = $entity->getType();
    $entity_subtype = $entity->getSubtype();
    if (empty($entity_subtype)) {
        $entity_subtype = 'default';
    }

    $entity_views = array(
        elgg_extract('item_view', $vars, ''),
        "$entity_type/$entity_subtype",
        "$entity_type/default",
    );

    $contents = '';
    foreach ($entity_views as $view) {
        if (elgg_view_exists($view)) {
            $contents = elgg_view($view, $vars, $bypass, $debug);
            break;
        }
    }

    // Marcus Povey 20090616 : Speculative and low impact approach for fixing #964
    if ($vars['full_view']) {
        $annotations = elgg_view_entity_annotations($entity, $vars['full_view']);

        if ($annotations) {
            $contents .= $annotations;
        }
    }
    return $contents;
}

function elgg_view_entity_icon(\ElggEntity $entity, $size = 'medium', $vars = array()) {

    // No point continuing if entity is null
    if (!$entity || !($entity instanceof \ElggEntity)) {
        return false;
    }

    $vars['entity'] = $entity;
    $vars['size'] = $size;

    $entity_type = $entity->getType();

    $subtype = $entity->getSubtype();
    if (empty($subtype)) {
        $subtype = 'default';
    }

    $contents = '';
    if (elgg_view_exists("icon/$entity_type/$subtype")) {
        $contents = elgg_view("icon/$entity_type/$subtype", $vars);
    }
    if (empty($contents)) {
        $contents = elgg_view("icon/$entity_type/default", $vars);
    }
    if (empty($contents)) {
        $contents = elgg_view("icon/default", $vars);
    }

    return $contents;
}

function elgg_view_annotation(\ElggAnnotation $annotation, array $vars = array(), $bypass = false, $debug = false) {
    elgg_register_rss_link();

    $defaults = array(
        'full_view' => true,
    );

    $vars = array_merge($defaults, $vars);
    $vars['annotation'] = $annotation;

    $name = $annotation->name;
    if (empty($name)) {
        return false;
    }

    $annotation_views = array(
        elgg_extract('item_view', $vars, ''),
        "annotation/$name",
        "annotation/default",
    );

    $contents = '';
    foreach ($annotation_views as $view) {
        if (elgg_view_exists($view)) {
            $contents = elgg_view($view, $vars, $bypass, $debug);
            break;
        }
    }

    return $contents;
}

function elgg_view_entity_list($entities, array $vars = array()) {
    $offset = (int)get_input('offset', 0);

    // list type can be passed as request parameter
    $list_type = get_input('list_type', 'list');

    $defaults = array(
        'items' => $entities,
        'list_class' => 'elgg-list-entity',
        'full_view' => true,
        'pagination' => true,
        'list_type' => $list_type,
        'list_type_toggle' => false,
        'offset' => $offset,
        'limit' => null,
    );

    $vars = array_merge($defaults, $vars);

    if (!$vars["limit"] && !$vars["offset"]) {
        // no need for pagination if listing is unlimited
        $vars["pagination"] = false;
    }

    if ($vars['list_type'] != 'list') {
        return elgg_view('page/components/gallery', $vars);
    } else {
        return elgg_view('page/components/list', $vars);
    }
}

function elgg_view_annotation_list($annotations, array $vars = array()) {
    $defaults = array(
        'items' => $annotations,
        'offset' => null,
        'limit' => null,
        'list_class' => 'elgg-list-annotation elgg-annotation-list', // @todo remove elgg-annotation-list in Elgg 1.9
        'full_view' => true,
        'offset_key' => 'annoff',
    );

    $vars = array_merge($defaults, $vars);

    if (!$vars["limit"] && !$vars["offset"]) {
        // no need for pagination if listing is unlimited
        $vars["pagination"] = false;
    }

    return elgg_view('page/components/list', $vars);
}

function elgg_view_entity_annotations(\ElggEntity $entity, $full_view = true) {
    if (!($entity instanceof \ElggEntity)) {
        return false;
    }

    $entity_type = $entity->getType();

    $annotations = elgg_trigger_plugin_hook('entity:annotate', $entity_type,
        array(
            'entity' => $entity,
            'full_view' => $full_view,
        )
    );

    return $annotations;
}

function elgg_view_title($title, array $vars = array()) {
    $vars['title'] = $title;

    return elgg_view('page/elements/title', $vars);
}

function elgg_view_friendly_time($time) {
    $view = 'output/friendlytime';
    $vars = ['time' => $time];
    $viewtype = elgg_view_exists($view) ? '' : 'default';

    return _elgg_view_under_viewtype($view, $vars, $viewtype);
}

function elgg_view_comments($entity, $add_comment = true, array $vars = array()) {
    if (!($entity instanceof \ElggEntity)) {
        return false;
    }

    $vars['entity'] = $entity;
    $vars['show_add_form'] = $add_comment;
    $vars['class'] = elgg_extract('class', $vars, "{$entity->getSubtype()}-comments");

    $output = elgg_trigger_plugin_hook('comments', $entity->getType(), $vars, false);
    if ($output !== false) {
        return $output;
    } else {
        return elgg_view('page/elements/comments', $vars);
    }
}

function elgg_view_image_block($image, $body, $vars = array()) {
    $vars['image'] = $image;
    $vars['body'] = $body;
    return elgg_view('page/components/image_block', $vars);
}

function elgg_view_module($type, $title, $body, array $vars = array()) {
    $vars['type'] = $type;
    $vars['title'] = $title;
    $vars['body'] = $body;
    return elgg_view('page/components/module', $vars);
}

function elgg_view_river_item($item, array $vars = array()) {
    if (!($item instanceof \ElggRiverItem)) {
        return '';
    }
    // checking default viewtype since some viewtypes do not have unique views per item (rss)
    $view = $item->getView();
    if (!$view || !elgg_view_exists($view, 'default')) {
        return '';
    }

    $subject = $item->getSubjectEntity();
    $object = $item->getObjectEntity();
    if (!$subject || !$object) {
        // subject is disabled or subject/object deleted
        return '';
    }

    // @todo this needs to be cleaned up
    // Don't hide objects in closed groups that a user can see.
    // see https://github.com/elgg/elgg/issues/4789
    //  else {
    //      // hide based on object's container
    //      $visibility = \Elgg\GroupItemVisibility::factory($object->container_guid);
    //      if ($visibility->shouldHideItems) {
    //          return '';
    //      }
    //  }

    $vars['item'] = $item;

    $river_views = array(
        elgg_extract('item_view', $vars, ''),
        "river/item",
    );

    $contents = '';
    foreach ($river_views as $view) {
        if (elgg_view_exists($view)) {
            $contents = elgg_view($view, $vars);
            break;
        }
    }

    return $contents;
}

function elgg_view_form($action, $form_vars = array(), $body_vars = array()) {
    global $CONFIG;

    $defaults = array(
        'action' => $CONFIG->wwwroot . "action/$action",
        'body' => elgg_view("forms/$action", $body_vars)
    );

    // append elgg-form class to any class options set
    $form_vars['class'] = (array) elgg_extract('class', $form_vars, []);
    $form_vars['class'][] = 'elgg-form-' . preg_replace('/[^a-z0-9]/i', '-', $action);
    
    $form_vars = array_merge($defaults, $form_vars);
    $form_vars['action_name'] = $action;

    return elgg_view('input/form', $form_vars);
}

function elgg_view_input($input_type, array $vars = array()) {

    if (!elgg_view_exists("input/$input_type")) {
        return '';
    }

    if ($input_type == 'hidden') {
        return elgg_view("input/$input_type", $vars);
    }

    $id = elgg_extract('id', $vars);
    if (!$id) {
        $id = "elgg-field-" . base_convert(mt_rand(), 10, 36);
        $vars['id'] = $id;
    }

    $vars['input_type'] = $input_type;

    $label = elgg_view('elements/forms/label', $vars);
    if ($input_type == 'checkbox') {
        $vars['label'] = $label;
        $vars['label_tag'] = 'div';
        $label = false;
    } else {
        unset($vars['label']);
    }

    $help = elgg_view('elements/forms/help', $vars);
    unset($vars['help']);

    $required = elgg_extract('required', $vars);

    $field_class = (array) elgg_extract('field_class', $vars, array());
    unset($vars['field_class']);

    $input = elgg_view("elements/forms/input", $vars);

    return elgg_view('elements/forms/field', array(
        'label' => $label,
        'help' => $help,
        'required' => $required,
        'id' => $id,
        'input' => $input,
        'class' => $field_class,
        'input_type' => $input_type,
    ));
}

function elgg_view_tagcloud(array $options = array()) {

    $type = $subtype = '';
    if (isset($options['type'])) {
        $type = $options['type'];
    }
    if (isset($options['subtype'])) {
        $subtype = $options['subtype'];
    }

    $tag_data = elgg_get_tags($options);
    return elgg_view("output/tagcloud", array(
        'value' => $tag_data,
        'type' => $type,
        'subtype' => $subtype,
    ));
}

function elgg_view_list_item($item, array $vars = array()) {

    if ($item instanceof \ElggEntity) {
        return elgg_view_entity($item, $vars);
    } else if ($item instanceof \ElggAnnotation) {
        return elgg_view_annotation($item, $vars);
    } else if ($item instanceof \ElggRiverItem) {
        return elgg_view_river_item($item, $vars);
    }

    return '';
}

function elgg_view_icon($name, $vars = array()) {
    if (empty($vars)) {
        $vars = array();
    }

    if ($vars === true) {
        elgg_deprecated_notice("Using a boolean to float the icon is deprecated. Use the class float.", 1.9);
        $vars = array('class' => 'float');
    }

    if (is_string($vars)) {
        $vars = array('class' => $vars);
    }

    if (!is_array($vars)) {
        throw new \InvalidArgumentException('$vars needs to be a string or an array');
    }

    if (!array_key_exists('class', $vars)) {
        $vars['class'] = array();
    }

    if (!is_array($vars['class'])) {
        $vars['class'] = array($vars['class']);
    }

    $vars['class'][] = "elgg-icon-$name";

    return elgg_view("output/icon", $vars);
}

function elgg_register_rss_link() {
    _elgg_services()->config->set('_elgg_autofeed', true);
}

function elgg_unregister_rss_link() {
    _elgg_services()->config->set('_elgg_autofeed', false);
}

function _elgg_has_rss_link() {
    if (isset($GLOBALS['autofeed']) && is_bool($GLOBALS['autofeed'])) {
        elgg_deprecated_notice('Do not set the global $autofeed. Use elgg_register_rss_link()', '2.1');
        return $GLOBALS['autofeed'];
    }
    return (bool)_elgg_services()->config->getVolatile('_elgg_autofeed');
}

function elgg_view_access_collections($owner_guid) {
    if ($collections = get_user_access_collections($owner_guid)) {
        $user = get_user($owner_guid);
        if ($user) {
            $entities = $user->getFriends(array('limit' => 0));
        } else {
            $entities = array();
        }

        foreach ($collections as $key => $collection) {
            $collections[$key]->members = get_members_of_access_collection($collection->id, true);
            $collections[$key]->entities = $entities;
        }
    }

    return elgg_view('core/friends/collections', array('collections' => $collections));
}

function autoregister_views($view_base, $folder, $ignored, $viewtype) {
    return _elgg_services()->views->autoregisterViews($view_base, $folder, $viewtype);
}

function _elgg_views_minify($hook, $type, $content, $params) {
    if (preg_match('~[\.-]min\.~', $params['view'])) {
        // bypass minification
        return;
    }

    if ($type == 'js') {
        if (elgg_get_config('simplecache_minify_js')) {
            return JSMin::minify($content);
        }
    } elseif ($type == 'css') {
        if (elgg_get_config('simplecache_minify_css')) {
            $cssmin = new CSSmin();
            return $cssmin->run($content);
        }
    }
}


function _elgg_views_amd($hook, $type, $content, $params) {
    $filter = new \Elgg\Amd\ViewFilter();
    return $filter->filter($params['view'], $content);
}

function elgg_views_add_rss_link() {
    if (_elgg_has_rss_link()) {
        $url = current_page_url();
        if (substr_count($url, '?')) {
            $url .= "&view=rss";
        } else {
            $url .= "?view=rss";
        }

        $url = elgg_format_url($url);
        elgg_register_menu_item('extras', array(
            'name' => 'rss',
            'text' => elgg_view_icon('rss'),
            'href' => $url,
            'title' => elgg_echo('feed:rss'),
        ));
    }
}

function _elgg_views_send_header_x_frame_options() {
    header('X-Frame-Options: SAMEORIGIN');
}

function _elgg_view_may_be_altered($view, $path) {
    $views = _elgg_services()->views;

    if ($views->viewIsExtended($view) || $views->viewHasHookHandlers($view)) {
        return true;
    }

    $viewtype = elgg_get_viewtype();

    // check location
    if (0 === strpos($path, '/') || preg_match('~^([A-Za-z]\:)?\\\\~', $path)) {
        // absolute path
        $expected_path = $path;
    } else {
        // relative path
        $root = dirname(dirname(__DIR__));
        $expected_path = "$root/views/$viewtype/" . ltrim($path, '/\\');
    }

    $view_path = $views->findViewFile($view, $viewtype);
    
    return realpath($view_path) !== realpath($expected_path);
}

function elgg_views_boot() {
    global $CONFIG;

    if (!elgg_get_config('system_cache_loaded')) {
        // Core view files in /views
        _elgg_services()->views->registerPluginViews(realpath(__DIR__ . '/../../'));

        // Core view definitions in /engine/views.php
        $file = dirname(__DIR__) . '/views.php';
        if (is_file($file)) {
            $spec = (include $file);
            if (is_array($spec)) {
                _elgg_services()->views->mergeViewsSpec($spec);
            }
        }
    }

    // on every page

    // jQuery and UI must come before require. See #9024
    elgg_register_js('jquery', elgg_get_simplecache_url('jquery.js'), 'head');
    elgg_load_js('jquery');

    elgg_register_js('jquery-ui', elgg_get_simplecache_url('jquery-ui.js'), 'head');
    elgg_load_js('jquery-ui');

    elgg_register_js('elgg.require_config', elgg_get_simplecache_url('elgg/require_config.js'), 'head');
    elgg_load_js('elgg.require_config');

    elgg_register_js('require', elgg_get_simplecache_url('require.js'), 'head');
    elgg_load_js('require');

    elgg_register_js('elgg', elgg_get_simplecache_url('elgg.js'), 'head');
    elgg_load_js('elgg');
    
    elgg_register_css('font-awesome', elgg_get_simplecache_url('font-awesome/css/font-awesome.css'));
    elgg_load_css('font-awesome');

    elgg_register_css('elgg', elgg_get_simplecache_url('elgg.css'));
    elgg_load_css('elgg');

    elgg_register_simplecache_view('elgg/init.js');

    elgg_register_css('lightbox', elgg_get_simplecache_url('lightbox/elgg-colorbox-theme/colorbox.css'));
    elgg_load_css('lightbox');

    // provide warning to use elgg/lightbox AMD
    elgg_register_js('lightbox', elgg_get_simplecache_url('lightbox.js'));

    // just provides warning to use elgg/autocomplete AMD
    elgg_register_js('elgg.autocomplete', elgg_normalize_url('js/lib/ui.autocomplete.js'));

    elgg_define_js('jquery.ui.autocomplete.html', [
        'deps' => ['jquery-ui'],
    ]);

    elgg_register_js('elgg.friendspicker', elgg_get_simplecache_url('elgg/ui.friends_picker.js'));
    elgg_register_js('elgg.avatar_cropper', elgg_get_simplecache_url('elgg/ui.avatar_cropper.js'));

    // @deprecated 2.2
    elgg_register_js('elgg.ui.river', elgg_get_simplecache_url('elgg/ui.river.js'));

    elgg_register_js('jquery.imgareaselect', elgg_get_simplecache_url('jquery.imgareaselect.js'));
    elgg_register_css('jquery.imgareaselect', elgg_get_simplecache_url('jquery.imgareaselect.css'));

    elgg_register_ajax_view('languages.js');

    elgg_register_plugin_hook_handler('simplecache:generate', 'js', '_elgg_views_amd');
    elgg_register_plugin_hook_handler('simplecache:generate', 'css', '_elgg_views_minify');
    elgg_register_plugin_hook_handler('simplecache:generate', 'js', '_elgg_views_minify');

    elgg_register_plugin_hook_handler('output:before', 'layout', 'elgg_views_add_rss_link');
    elgg_register_plugin_hook_handler('output:before', 'page', '_elgg_views_send_header_x_frame_options');

    // registered with high priority for BC
    // prior to 2.2 registration used to take place in _elgg_views_prepare_head() before the hook was triggered
    elgg_register_plugin_hook_handler('head', 'page', '_elgg_views_prepare_favicon_links', 1);
    
    // @todo the cache is loaded in load_plugins() but we need to know viewtypes earlier
    $view_path = $GLOBALS['_ELGG']->view_path;
    $viewtype_dirs = scandir($view_path);
    foreach ($viewtype_dirs as $viewtype) {
        if (_elgg_is_valid_viewtype($viewtype) && is_dir($view_path . $viewtype)) {
            elgg_register_viewtype($viewtype);
        }
    }

    // set default icon sizes - can be overridden in settings.php or with plugin
    if (!isset($CONFIG->icon_sizes)) {
        $icon_sizes = array(
            'topbar' => array('w' => 16, 'h' => 16, 'square' => true, 'upscale' => true),
            'tiny' => array('w' => 25, 'h' => 25, 'square' => true, 'upscale' => true),
            'small' => array('w' => 40, 'h' => 40, 'square' => true, 'upscale' => true),
            'medium' => array('w' => 100, 'h' => 100, 'square' => true, 'upscale' => true),
            'large' => array('w' => 200, 'h' => 200, 'square' => false, 'upscale' => false),
            'master' => array('w' => 550, 'h' => 550, 'square' => false, 'upscale' => false),
        );
        elgg_set_config('icon_sizes', $icon_sizes);
    }
}

function _elgg_manage_pagesetup($hook, $view, $value, $params) {
    global $CONFIG;

    static $allow_delay_pagesetup = true;

    if (isset($GLOBALS['_ELGG']->pagesetupdone) || empty($CONFIG->boot_complete)) {
        return;
    }

    // only first rendering gets an opportunity to delay
    $allow_delay = $allow_delay_pagesetup;
    $allow_delay_pagesetup = false;

    if ($allow_delay && (0 === strpos($view, 'resources/'))) {
        return;
    }

    $GLOBALS['_ELGG']->pagesetupdone = true;

    // don't call this anymore
    _elgg_services()->hooks->unregisterHandler('view_vars', 'all', '_elgg_manage_pagesetup');

    _elgg_services()->events->trigger('pagesetup', 'system');
}

function _elgg_get_js_site_data() {
    $language = elgg_get_config('language');
    if (!$language) {
        $language = 'en';
    }

    return [
        'elgg.data' => (object)elgg_trigger_plugin_hook('elgg.data', 'site', null, []),
        'elgg.version' => elgg_get_version(),
        'elgg.release' => elgg_get_version(true),
        'elgg.config.wwwroot' => elgg_get_site_url(),

        // refresh token 3 times during its lifetime (in microseconds 1000 * 1/3)
        'elgg.security.interval' => (int)_elgg_services()->actions->getActionTokenTimeout() * 333,
        'elgg.config.language' => $language,
    ];
}

function _elgg_get_js_page_data() {
    $data = elgg_trigger_plugin_hook('elgg.data', 'page', null, []);
    if (!is_array($data)) {
        elgg_log('"elgg.data" plugin hook handlers must return an array. Returned ' . gettype($data) . '.', 'ERROR');
        $data = [];
    }

    $elgg = array(
        'config' => array(
            'lastcache' => (int) elgg_get_config('lastcache'),
            'viewtype' => elgg_get_viewtype(),
            'simplecache_enabled' => (int) elgg_is_simplecache_enabled(),
        ),
        'security' => array(
            'token' => array(
                '__elgg_ts' => $ts = time(),
                '__elgg_token' => generate_action_token($ts),
            ),
        ),
        'session' => array(
            'user' => null,
            'token' => _elgg_services()->session->get('__elgg_session'),
        ),
        '_data' => (object) $data,
    );

    if (elgg_get_config('elgg_load_sync_code')) {
        $elgg['config']['load_sync_code'] = true;
    }

    $page_owner = elgg_get_page_owner_entity();
    if ($page_owner instanceof ElggEntity) {
        $elgg['page_owner'] = $page_owner->toObject();
    }

    $user = elgg_get_logged_in_user_entity();
    if ($user instanceof ElggUser) {
        $user_object = $user->toObject();
        $user_object->admin = $user->isAdmin();
        $elgg['session']['user'] = $user_object;
    }

    return $elgg;
}

function _elgg_view_under_viewtype($view, $vars, $viewtype) {
    if ($viewtype) {
        $old = elgg_get_viewtype();
        elgg_set_viewtype($viewtype);
    }

    $ret = elgg_view($view, $vars);

    if ($viewtype) {
        elgg_set_viewtype($old);
    }

    return $ret;
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $events->registerHandler('boot', 'system', 'elgg_views_boot');
    $hooks->registerHandler('view_vars', 'all', '_elgg_manage_pagesetup', 1000);
};