mirror of
https://github.com/sbrl/Pepperminty-Wiki.git
synced 2024-12-22 13:45:02 +00:00
539 lines
18 KiB
PHP
539 lines
18 KiB
PHP
<?php
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/**
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* Renders the HTML page that is sent to the client.
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* @package core
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*/
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class page_renderer
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{
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/**
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* The root HTML template that all pages are built from.
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* @var string
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* @package core
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*/
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public static $html_template = "<!DOCTYPE html>
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<html>
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<head>
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<meta charset='utf-8' />
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<title>{title}</title>
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<meta name='viewport' content='width=device-width, initial-scale=1' />
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<meta name='generator' content='Pepperminty Wiki {version}' />
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<link rel='shortcut-icon' href='{favicon-url}' />
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<link rel='icon' href='{favicon-url}' />
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{header-html}
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</head>
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<body>
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{body}
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<!-- Took {generation-time-taken}ms to generate -->
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</body>
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</html>
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";
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/**
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* The main content template that is used to render normal wiki pages.
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* @var string
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* @package core
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*/
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public static $main_content_template = "{navigation-bar}
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<h1 class='sitename'>{sitename}</h1>
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<main>
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{content}
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</main>
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{extra}
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<footer>
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<p>{footer-message}</p>
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<p>Powered by Pepperminty Wiki {version}, which was built by <a href='//starbeamrainbowlabs.com/'>Starbeamrainbowlabs</a>. Send bugs to 'bugs at starbeamrainbowlabs dot com' or <a href='//github.com/sbrl/Pepperminty-Wiki' title='Github Issue Tracker'>open an issue</a>.</p>
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<p>Your local friendly moderators are {admins-name-list}.</p>
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<p>This wiki is managed by <a href='mailto:{admin-details-email}'>{admin-details-name}</a>.</p>
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</footer>
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{navigation-bar-bottom}
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{all-pages-datalist}";
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/**
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* A specially minified content template that doesn't include the navbar and
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* other elements not suitable for printing.
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* @var string
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* @package core
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*/
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public static $minimal_content_template = "<main class='printable'>{content}</main>
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<footer class='printable'>
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<hr class='footerdivider' />
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<p><em>From {sitename}, which is managed by {admin-details-name}.</em></p>
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<p>{footer-message}</p>
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<p><em>Timed at {generation-date}</em></p>
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<p><em>Powered by Pepperminty Wiki {version}.</em></p>
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</footer>";
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/**
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* An array of items indicating the resources to ask the web server to push
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* down to the client with HTTP/2.0 server push.
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* Format: [ [type, path], [type, path], .... ]
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* @var array[]
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*/
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protected static $http2_push_items = [];
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/**
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* A string of extrar HTML that should be included at the bottom of the page <head>.
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* @var string
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*/
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private static $extraHeaderHTML = "";
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/**
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* The javascript snippets that will be included in the page.
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* @var string[]
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* @package core
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*/
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private static $jsSnippets = [];
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/**
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* The urls of the external javascript files that should be referenced
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* by the page.
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* @var string[]
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* @package core
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*/
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private static $jsLinks = [];
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/**
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* The navigation bar divider.
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* @package core
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* @var string
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*/
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public static $nav_divider = "<span class='nav-divider inflexible'> | </span>";
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/**
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* An array of functions that have been registered to process the
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* find / replace array before the page is rendered. Note that the function
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* should take a *reference* to an array as its only argument.
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* @var array
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* @package core
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*/
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protected static $part_processors = [];
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/**
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* Registers a function as a part post processor.
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* This function's use is more complicated to explain. Pepperminty Wiki
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* renders pages with a very simple templating system. For example, in the
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* template a page's content is denoted by `{content}`. A function
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* registered here will be passed all the components of a page _just_
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* before they are dropped into the template. Note that the function you
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* pass in here should take a *reference* to the components, as the return
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* value of the function passed is discarded.
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* @package core
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* @param callable $function The part preprocessor to register.
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*/
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public static function register_part_preprocessor($function) {
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global $settings;
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// Make sure that the function we are about to register is valid
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if(!is_callable($function))
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{
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http_response_code(500);
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$admin_email = hide_email($settings->admindetails_email);
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exit(page_renderer::render("$settings->sitename - Module Error", "<p>$settings->sitename has got a misbehaving module installed that tried to register an invalid HTML handler with the page renderer. Please contact $settings->sitename's administrator {$settings->admindetails_name} at <a href='mailto:$admin_email'>$admin_email</a>."));
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}
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self::$part_processors[] = $function;
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return true;
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}
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/**
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* Renders a HTML page with the content specified.
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* @package core
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* @param string $title The title of the page.
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* @param string $content The (HTML) content of the page.
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* @param bool $body_template The HTML content template to use.
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* @return string The rendered HTML, ready to send to the client :-)
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*/
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public static function render($title, $content, $body_template = false)
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{
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global $settings, $start_time, $version;
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if($body_template === false)
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$body_template = self::$main_content_template;
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if(strlen($settings->logo_url) > 0) {
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// A logo url has been specified
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$logo_html = "<img class='logo" . (isset($_GET["printable"]) ? " small" : "") . "' src='$settings->logo_url' />";
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switch($settings->logo_position) {
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case "left":
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$logo_html = "$logo_html $settings->sitename";
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break;
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case "right":
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$logo_html .= " $settings->sitename";
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break;
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default:
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throw new Exception("Invalid logo_position '$settings->logo_position'. Valid values are either \"left\" or \"right\" and are case sensitive.");
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}
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}
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// Push the logo via HTTP/2.0 if possible
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if($settings->favicon[0] === "/") self::$http2_push_items[] = ["image", $settings->favicon];
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$parts = [
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"{body}" => $body_template,
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"{sitename}" => $logo_html,
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"{version}" => $version,
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"{favicon-url}" => $settings->favicon,
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"{header-html}" => self::get_header_html(),
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"{navigation-bar}" => self::render_navigation_bar($settings->nav_links, $settings->nav_links_extra, "top"),
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"{navigation-bar-bottom}" => self::render_navigation_bar($settings->nav_links_bottom, [], "bottom"),
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"{admin-details-name}" => $settings->admindetails_name,
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"{admin-details-email}" => $settings->admindetails_email,
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"{admins-name-list}" => implode(", ", array_map(function($username) { return page_renderer::render_username($username); }, $settings->admins)),
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"{generation-date}" => date("l jS \of F Y \a\\t h:ia T"),
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"{all-pages-datalist}" => self::generate_all_pages_datalist(),
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"{footer-message}" => $settings->footer_message,
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/// Secondary Parts ///
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"{content}" => $content,
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"{extra}" => "",
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"{title}" => $title,
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];
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// Pass the parts through the part processors
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foreach(self::$part_processors as $function) {
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$function($parts);
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}
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$result = self::$html_template;
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$result = str_replace(array_keys($parts), array_values($parts), $result);
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$result = str_replace("{generation-time-taken}", round((microtime(true) - $start_time)*1000, 2), $result);
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// Send the HTTP/2.0 server push indicators if possible - but not if we're sending a redirect page
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if(!headers_sent() && (http_response_code() < 300 || http_response_code() >= 400)) self::send_server_push_indicators();
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return $result;
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}
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/**
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* Renders a normal HTML page.
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* @package core
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* @param string $title The title of the page.
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* @param string $content The content of the page.
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* @return string The rendered page.
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*/
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public static function render_main($title, $content) {
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return self::render($title, $content, self::$main_content_template);
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}
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/**
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* Renders a minimal HTML page. Useful for printable pages.
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* @package core
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* @param string $title The title of the page.
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* @param string $content The content of the page.
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* @return string The rendered page.
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*/
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public static function render_minimal($title, $content) {
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return self::render($title, $content, self::$minimal_content_template);
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}
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/**
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* Sends the currently registered HTTP2 server push items to the client.
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* @return int|false The number of resource hints included in the link: header, or false if server pushing is disabled.
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*/
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public static function send_server_push_indicators() {
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global $settings;
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if(!$settings->http2_server_push)
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return false;
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// Render the preload directives
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$link_header_parts = [];
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foreach(self::$http2_push_items as $push_item)
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$link_header_parts[] = "<{$push_item[1]}>; rel=preload; as={$push_item[0]}";
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// Send them in a link: header
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if(!empty($link_header_parts))
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header("link: " . implode(", ", $link_header_parts));
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return count(self::$http2_push_items);
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}
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/**
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* Renders the header HTML.
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* @package core
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* @return string The rendered HTML that goes in the header.
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*/
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public static function get_header_html()
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{
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global $settings;
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$result = self::$extraHeaderHTML;
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$result .= self::get_css_as_html();
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$result .= self::_get_js();
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// We can't use module_exists here because sometimes global $modules
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// hasn't populated yet when we get called O.o
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if(class_exists("search"))
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$result .= "\t\t<link rel='search' type='application/opensearchdescription+xml' href='?action=opensearch-description' title='$settings->sitename Search' />\n";
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if(!empty($settings->enable_math_rendering)) {
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$result .= "<script type='text/x-mathjax-config'>
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MathJax.Hub.Config({
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tex2jax: {
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inlineMath: [ ['$','$'], ['\\\\(','\\\\)'] ],
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processEscapes: true,
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skipTags: ['script','noscript','style','textarea','pre','code']
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}
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});
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</script>";
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}
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return $result;
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}
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/**
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* Figures out whether $settings->css is a url, or a string of css.
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* A url is something starting with "protocol://" or simply a "/".
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* @return bool True if it's a url - false if we assume it's a string of css.
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*/
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public static function is_css_url() {
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global $settings;
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return preg_match("/^[^\/]*\/\/|^\/[^\*]/", $settings->css);
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}
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/**
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* Renders all the CSS as HTML.
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* @package core
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* @return string The css as HTML, ready to be included in the HTML header.
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*/
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public static function get_css_as_html()
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{
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global $settings, $defaultCSS;
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if(self::is_css_url()) {
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if($settings->css[0] === "/") // Push it if it's a relative resource
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self::add_server_push_indicator("style", $settings->css);
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return "<link rel='stylesheet' href='$settings->css' />\n";
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} else {
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$css = $settings->css == "auto" ? $defaultCSS : $settings->css;
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if(!empty($settings->optimize_pages)) {
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// CSS Minification ideas by Jean from catswhocode.com
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// Link: http://www.catswhocode.com/blog/3-ways-to-compress-css-files-using-php
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// Remove comments
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$css = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', "", $css);
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// Cut down whitespace
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$css = preg_replace('/\s+/', " ", $css);
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// Remove whitespace after colons and semicolons
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$css = str_replace([
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" :",
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": ",
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"; ",
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" { ",
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" } "
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], [
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":",
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":",
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";",
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"{",
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"}"
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], $css);
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}
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return "<style>$css</style>\n";
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}
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}
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/**
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* Adds the specified url to a javascript file as a reference to the page.
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* @package core
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* @param string $scriptUrl The url of the javascript file to reference.
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*/
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public function add_js_link(string $scriptUrl) {
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static::$jsLinks[] = $scriptUrl;
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}
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/**
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* Adds a javascript snippet to the page.
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* @package core
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* @param string $script The snippet of javascript to add.
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*/
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public function add_js_snippet(string $script) {
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static::$jsSnippets[] = $script;
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}
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/**
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* Renders the included javascript header for inclusion in the final
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* rendered page.
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* @package core
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* @return string The rendered javascript ready for inclusion in the page.
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*/
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private static function _get_js() {
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$result = "<!-- Javascript -->\n";
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foreach(static::$jsSnippets as $snippet)
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$result .= "<script defer>\n$snippet\n</script>\n";
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foreach(static::$jsLinks as $link) {
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// Push it via HTTP/2.0 if it's relative
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if($link[0] === "/") self::add_server_push_indicator("script", $link);
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$result .= "<script src='" . $link . "' defer></script>\n";
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}
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return $result;
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}
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/**
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* Adds a string of HTML to the header of the rendered page.
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* @param string $html The string of HTML to add.
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*/
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public static function add_header_html($html) {
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self::$extraHeaderHTML .= $html;
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}
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/**
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* Adds a resource to the list of items to indicate that the web server should send via HTTP/2.0 Server Push.
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* Note: Only specify static files here, as you might end up with strange (and possibly dangerous) results!
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* @param string $type The resource type. See https://fetch.spec.whatwg.org/#concept-request-destination for more information.
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* @param string $path The *relative url path* to the resource.
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*/
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public static function add_server_push_indicator($type, $path) {
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self::$http2_push_items[] = [ $type, $path ];
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}
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/**
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* Renders a navigation bar from an array of links. See
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* $settings->nav_links for format information.
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* @package core
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* @param array $nav_links The links to add to the navigation bar.
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* @param array $nav_links_extra The extra nav links to add to
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* the "More..." menu.
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* @param string $class The class(es) to assign to the rendered
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* navigation bar.
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*/
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public static function render_navigation_bar($nav_links, $nav_links_extra, $class = "") {
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global $settings, $env;
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$result = "<nav class='$class'>\n";
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// Loop over all the navigation links
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foreach($nav_links as $item) {
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if(!is_string($item)) {
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// Output the item as a link to a url
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$result .= "<span><a href='" . str_replace("{page}", rawurlencode($env->page), $item[1]) . "'>$item[0]</a></span>";
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continue;
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}
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// The item is a string
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switch($item) {
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//keywords
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case "user-status": // Renders the user status box
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if($env->is_logged_in) {
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$result .= "<span class='inflexible logged-in" . ($env->is_logged_in ? " moderator" : " normal-user") . "'>";
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if(module_exists("feature-user-preferences")) {
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$result .= "<a href='?action=user-preferences'>$settings->user_preferences_button_text</a>";
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}
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$result .= self::render_username($env->user);
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$result .= " <small>(<a href='index.php?action=logout'>Logout</a>)</small>";
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$result .= "</span>";
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//$result .= page_renderer::$nav_divider;
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}
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else {
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$returnto_url = $env->action !== "logout" ? $_SERVER["REQUEST_URI"] : "?action=view&page=" . rawurlencode($settings->defaultpage);
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$result .= "<span class='not-logged-in'><a href='index.php?action=login&returnto=" . rawurlencode($returnto_url) . "'>Login</a></span>";
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}
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break;
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case "search": // Renders the search bar
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$result .= "<span class='inflexible'><form method='get' action='index.php' style='display: inline;'><input type='search' name='page' list='allpages' placeholder='Type a page name here and hit enter' /><input type='hidden' name='search-redirect' value='true' /></form></span>";
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break;
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case "divider": // Renders a divider
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$result .= page_renderer::$nav_divider;
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break;
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case "menu": // Renders the "More..." menu
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$result .= "<span class='inflexible nav-more'><label for='more-menu-toggler'>More...</label>
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<input type='checkbox' class='off-screen' id='more-menu-toggler' />";
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$result .= page_renderer::render_navigation_bar($nav_links_extra, [], "nav-more-menu");
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$result .= "</span>";
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break;
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// It isn't a keyword, so just output it directly
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default:
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$result .= "<span>$item</span>";
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}
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}
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$result .= "</nav>";
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return $result;
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}
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/**
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* Renders a username for inclusion in a page.
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* @package core
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* @param string $name The username to render.
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* @return string The username rendered in HTML.
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*/
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public static function render_username($name) {
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global $settings;
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$result = "";
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$result .= "<a href='?page=" . rawurlencode(get_user_pagename($name)) . "'>";
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if($settings->avatars_show)
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$result .= "<img class='avatar' src='?action=avatar&user=" . urlencode($name) . "&size=$settings->avatars_size' /> ";
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if(in_array($name, $settings->admins))
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$result .= $settings->admindisplaychar;
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$result .= htmlentities($name);
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$result .= "</a>";
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return $result;
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}
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/**
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* Renders the datalist for the search box as HTML.
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* @package core
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* @return string The search box datalist as HTML.
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*/
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public static function generate_all_pages_datalist() {
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global $settings, $pageindex;
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$arrayPageIndex = get_object_vars($pageindex);
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ksort($arrayPageIndex);
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$result = "<datalist id='allpages'>\n";
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// If dynamic page sugggestions are enabled, then we should send a loading message instead.
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if($settings->dynamic_page_suggestion_count > 0) {
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$result .= "<option value='Loading suggestions...' />";
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} else {
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foreach($arrayPageIndex as $pagename => $pagedetails) {
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$escapedPageName = str_replace('"', '"', $pagename);
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$result .= "\t\t\t<option value=\"$escapedPageName\" />\n";
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}
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}
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$result .= "\t\t</datalist>";
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return $result;
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}
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}
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// HTTP/2.0 Server Push static items
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foreach($settings->http2_server_push_items as $push_item) {
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page_renderer::add_server_push_indicator($push_item[0], $push_item[1]);
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}
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// Math rendering support
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if(!empty($settings->enable_math_rendering))
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{
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page_renderer::add_js_link("https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_CHTML");
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}
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// alt+enter support in the search box
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page_renderer::add_js_snippet('// Alt + Enter support in the top search box
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window.addEventListener("load", function(event) {
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document.querySelector("input[type=search]").addEventListener("keyup", function(event) {
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// Listen for Alt + Enter
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if(event.keyCode == 13 && event.altKey) {
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event.stopPropagation();
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event.preventDefault();
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event.cancelBubble = true;
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event.target.form.setAttribute("target", "_blank");
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event.target.form.submit();
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event.target.form.removeAttribute("target");
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return false; // Required by some browsers
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}
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});
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});
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');
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