<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\App;
use ArrayAccess;
use DOMDocument;
use DOMXPath;
use Friendica\App;
use Friendica\Content\Nav;
use Friendica\Core\Config\IConfig;
use Friendica\Core\PConfig\IPConfig;
use Friendica\Core\Hook;
use Friendica\Core\L10n;
use Friendica\Core\Renderer;
use Friendica\Core\Theme;
use Friendica\Module\Special\HTTPException as ModuleHTTPException;
use Friendica\Network\HTTPException;
use Friendica\Util\Network;
use Friendica\Util\Strings;
/**
* Contains the page specific environment variables for the current Page
* - Contains all stylesheets
* - Contains all footer-scripts
* - Contains all page specific content (header, footer, content, ...)
*
* The run() method is the single point where the page will get printed to the screen
*/
class Page implements ArrayAccess
{
/**
* @var array Contains all stylesheets, which should get loaded during page
*/
private $stylesheets = [];
/**
* @var array Contains all scripts, which are added to the footer at last
*/
private $footerScripts = [];
/**
* @var array The page content, which are showed directly
*/
private $page = [
'aside' => '',
'bottom' => '',
'content' => '',
'footer' => '',
'htmlhead' => '',
'nav' => '',
'page_title' => '',
'right_aside' => '',
'template' => '',
'title' => '',
];
/**
* @var string The basepath of the page
*/
private $basePath;
/**
* @param string $basepath The Page basepath
*/
public function __construct(string $basepath)
{
$this->basePath = $basepath;
}
/**
* Whether a offset exists
*
* @link https://php.net/manual/en/arrayaccess.offsetexists.php
*
* @param mixed $offset <p>
* An offset to check for.
* </p>
*
* @return boolean true on success or false on failure.
* </p>
* <p>
* The return value will be casted to boolean if non-boolean was returned.
* @since 5.0.0
*/
public function offsetExists($offset)
{
return isset($this->page[$offset]);
}
/**
* Offset to retrieve
*
* @link https://php.net/manual/en/arrayaccess.offsetget.php
*
* @param mixed $offset <p>
* The offset to retrieve.
* </p>
*
* @return mixed Can return all value types.
* @since 5.0.0
*/
public function offsetGet($offset)
{
return $this->page[$offset] ?? null;
}
/**
* Offset to set
*
* @link https://php.net/manual/en/arrayaccess.offsetset.php
*
* @param mixed $offset <p>
* The offset to assign the value to.
* </p>
* @param mixed $value <p>
* The value to set.
* </p>
*
* @return void
* @since 5.0.0
*/
public function offsetSet($offset, $value)
{
$this->page[$offset] = $value;
}
/**
* Offset to unset
*
* @link https://php.net/manual/en/arrayaccess.offsetunset.php
*
* @param mixed $offset <p>
* The offset to unset.
* </p>
*
* @return void
* @since 5.0.0
*/
public function offsetUnset($offset)
{
if (isset($this->page[$offset])) {
unset($this->page[$offset]);
}
}
/**
* Register a stylesheet file path to be included in the <head> tag of every page.
* Inclusion is done in App->initHead().
* The path can be absolute or relative to the Friendica installation base folder.
*
* @param string $path
* @param string $media
* @see Page::initHead()
*/
public function registerStylesheet($path, string $media = 'screen')
{
$path = Network::appendQueryParam($path, ['v' => FRIENDICA_VERSION]);
if (mb_strpos($path, $this->basePath . DIRECTORY_SEPARATOR) === 0) {
$path = mb_substr($path, mb_strlen($this->basePath . DIRECTORY_SEPARATOR));
}
$this->stylesheets[trim($path, '/')] = $media;
}
/**
* Initializes Page->page['htmlhead'].
*
* Includes:
* - Page title
* - Favicons
* - Registered stylesheets (through App->registerStylesheet())
* - Infinite scroll data
* - head.tpl template
*
* @param App $app The Friendica App instance
* @param Module $module The loaded Friendica module
* @param L10n $l10n The l10n language instance
* @param IConfig $config The Friendica configuration
* @param IPConfig $pConfig The Friendica personal configuration (for user)
*
* @throws HTTPException\InternalServerErrorException
*/
private function initHead(App $app, Module $module, L10n $l10n, IConfig $config, IPConfig $pConfig)
{
$interval = ((local_user()) ? $pConfig->get(local_user(), 'system', 'update_interval') : 40000);
// If the update is 'deactivated' set it to the highest integer number (~24 days)
if ($interval < 0) {
$interval = 2147483647;
}
if ($interval < 10000) {
$interval = 40000;
}
// Default title: current module called
if (empty($this->page['title']) && $module->getName()) {
$this->page['title'] = ucfirst($module->getName());
}
// Prepend the sitename to the page title
$this->page['title'] = $config->get('config', 'sitename', '') . (!empty($this->page['title']) ? ' | ' . $this->page['title'] : '');
if (!empty(Renderer::$theme['stylesheet'])) {
$stylesheet = Renderer::$theme['stylesheet'];
} else {
$stylesheet = $app->getCurrentThemeStylesheetPath();
}
$this->registerStylesheet($stylesheet);
$shortcut_icon = $config->get('system', 'shortcut_icon');
if ($shortcut_icon == '') {
$shortcut_icon = 'images/friendica-32.png';
}
$touch_icon = $config->get('system', 'touch_icon');
if ($touch_icon == '') {
$touch_icon = 'images/friendica-192.png';
}
Hook::callAll('head', $this->page['htmlhead']);
$tpl = Renderer::getMarkupTemplate('head.tpl');
/* put the head template at the beginning of page['htmlhead']
* since the code added by the modules frequently depends on it
* being first
*/
$this->page['htmlhead'] = Renderer::replaceMacros($tpl, [
'$local_user' => local_user(),
'$generator' => 'Friendica' . ' ' . FRIENDICA_VERSION,
'$delitem' => $l10n->t('Delete this item?'),
'$update_interval' => $interval,
'$shortcut_icon' => $shortcut_icon,
'$touch_icon' => $touch_icon,
'$block_public' => intval($config->get('system', 'block_public')),
'$stylesheets' => $this->stylesheets,
]) . $this->page['htmlhead'];
}
/**
* Initializes Page->page['footer'].
*
* Includes:
* - Javascript homebase
* - Mobile toggle link
* - Registered footer scripts (through App->registerFooterScript())
* - footer.tpl template
*
* @param App $app The Friendica App instance
* @param Mode $mode The Friendica runtime mode
* @param L10n $l10n The l10n instance
*
* @throws HTTPException\InternalServerErrorException
*/
private function initFooter(App $app, Mode $mode, L10n $l10n)
{
// If you're just visiting, let javascript take you home
if (!empty($_SESSION['visitor_home'])) {
$homebase = $_SESSION['visitor_home'];
} elseif (!empty($app->user['nickname'])) {
$homebase = 'profile/' . $app->user['nickname'];
}
if (isset($homebase)) {
$this->page['footer'] .= '<script>var homebase="' . $homebase . '";</script>' . "\n";
}
/*
* Add a "toggle mobile" link if we're using a mobile device
*/
if ($mode->isMobile() || $mode->isTablet()) {
if (isset($_SESSION['show-mobile']) && !$_SESSION['show-mobile']) {
$link = 'toggle_mobile?address=' . urlencode(curPageURL());
} else {
$link = 'toggle_mobile?off=1&address=' . urlencode(curPageURL());
}
$this->page['footer'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate("toggle_mobile_footer.tpl"), [
'$toggle_link' => $link,
'$toggle_text' => $l10n->t('toggle mobile')
]);
}
Hook::callAll('footer', $this->page['footer']);
$tpl = Renderer::getMarkupTemplate('footer.tpl');
$this->page['footer'] = Renderer::replaceMacros($tpl, [
'$footerScripts' => array_unique($this->footerScripts),
]) . $this->page['footer'];
}
/**
* Initializes Page->page['content'].
*
* Includes:
* - module content
* - hooks for content
*
* @param Module $module The module
* @param Mode $mode The Friendica execution mode
*
* @throws HTTPException\InternalServerErrorException
*/
private function initContent(Module $module, Mode $mode)
{
$content = '';
try {
$moduleClass = $module->getClassName();
$arr = ['content' => $content];
Hook::callAll($moduleClass . '_mod_content', $arr);
$content = $arr['content'];
$arr = ['content' => call_user_func([$moduleClass, 'content'], $module->getParameters())];
Hook::callAll($moduleClass . '_mod_aftercontent', $arr);
$content .= $arr['content'];
} catch (HTTPException $e) {
$content = ModuleHTTPException::content($e);
}
// initialise content region
if ($mode->isNormal()) {
Hook::callAll('page_content_top', $this->page['content']);
}
$this->page['content'] .= $content;
}
/**
* Register a javascript file path to be included in the <footer> tag of every page.
* Inclusion is done in App->initFooter().
* The path can be absolute or relative to the Friendica installation base folder.
*
* @param string $path
*
* @see Page::initFooter()
*
*/
public function registerFooterScript($path)
{
$path = Network::appendQueryParam($path, ['v' => FRIENDICA_VERSION]);
$url = str_replace($this->basePath . DIRECTORY_SEPARATOR, '', $path);
$this->footerScripts[] = trim($url, '/');
}
/**
* Executes the creation of the current page and prints it to the screen
*
* @param App $app The Friendica App
* @param BaseURL $baseURL The Friendica Base URL
* @param Mode $mode The current node mode
* @param Module $module The loaded Friendica module
* @param L10n $l10n The l10n language class
* @param IConfig $config The Configuration of this node
* @param IPConfig $pconfig The personal/user configuration
*
* @throws HTTPException\InternalServerErrorException
*/
public function run(App $app, BaseURL $baseURL, Mode $mode, Module $module, L10n $l10n, IConfig $config, IPConfig $pconfig)
{
$moduleName = $module->getName();
/* Create the page content.
* Calls all hooks which are including content operations
*
* Sets the $Page->page['content'] variable
*/
$this->initContent($module, $mode);
// Load current theme info after module has been initialized as theme could have been set in module
$currentTheme = $app->getCurrentTheme();
$theme_info_file = 'view/theme/' . $currentTheme . '/theme.php';
if (file_exists($theme_info_file)) {
require_once $theme_info_file;
}
if (function_exists(str_replace('-', '_', $currentTheme) . '_init')) {
$func = str_replace('-', '_', $currentTheme) . '_init';
$func($app);
}
/* Create the page head after setting the language
* and getting any auth credentials.
*
* Moved initHead() and initFooter() to after
* all the module functions have executed so that all
* theme choices made by the modules can take effect.
*/
$this->initHead($app, $module, $l10n, $config, $pconfig);
/* Build the page ending -- this is stuff that goes right before
* the closing </body> tag
*/
$this->initFooter($app, $mode, $l10n);
if (!$mode->isAjax()) {
Hook::callAll('page_end', $this->page['content']);
}
// Add the navigation (menu) template
if ($moduleName != 'install' && $moduleName != 'maintenance') {
$this->page['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('nav_head.tpl'), []);
$this->page['nav'] = Nav::build($app);
}
// Build the page - now that we have all the components
if (isset($_GET["mode"]) && (($_GET["mode"] == "raw") || ($_GET["mode"] == "minimal"))) {
$doc = new DOMDocument();
$target = new DOMDocument();
$target->loadXML("<root></root>");
$content = mb_convert_encoding($this->page["content"], 'HTML-ENTITIES', "UTF-8");
/// @TODO one day, kill those error-surpressing @ stuff, or PHP should ban it
@$doc->loadHTML($content);
$xpath = new DOMXPath($doc);
$list = $xpath->query("//*[contains(@id,'tread-wrapper-')]"); /* */
foreach ($list as $item) {
$item = $target->importNode($item, true);
// And then append it to the target
$target->documentElement->appendChild($item);
}
if ($_GET["mode"] == "raw") {
header("Content-type: text/html; charset=utf-8");
echo substr($target->saveHTML(), 6, -8);
exit();
}
}
$page = $this->page;
$profile = $app->profile;
header("X-Friendica-Version: " . FRIENDICA_VERSION);
header("Content-type: text/html; charset=utf-8");
if ($config->get('system', 'hsts') && ($baseURL->getSSLPolicy() == BaseURL::SSL_POLICY_FULL)) {
header("Strict-Transport-Security: max-age=31536000");
}
// Some security stuff
header('X-Content-Type-Options: nosniff');
header('X-XSS-Protection: 1; mode=block');
header('X-Permitted-Cross-Domain-Policies: none');
header('X-Frame-Options: sameorigin');
// Things like embedded OSM maps don't work, when this is enabled
// header("Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; connect-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self'; img-src 'self' https: data:; media-src 'self' https:; child-src 'self' https:; object-src 'none'");
/* We use $_GET["mode"] for special page templates. So we will check if we have
* to load another page template than the default one.
* The page templates are located in /view/php/ or in the theme directory.
*/
if (isset($_GET['mode'])) {
$template = Theme::getPathForFile('php/' . Strings::sanitizeFilePathItem($_GET['mode']) . '.php');
}
// If there is no page template use the default page template
if (empty($template)) {
$template = Theme::getPathForFile('php/default.php');
}
// Theme templates expect $a as an App instance
$a = $app;
// Used as is in view/php/default.php
$lang = $l10n->getCurrentLang();
require_once $template;
}
}