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Pepperminty-Wiki/core/40-page-renderer.php
Starbeamrainbowlabs 45c2fa56cd
Add more type hints, and fail to get Server-Timing working.
Note to self: If we do end up implementing it, remember that 
$env->perfdata does containsensitive information sometimes, so we might 
need to revise our approach a bit (e.g. only sending it to authenticated 
admins)
2020-07-28 02:10:28 +01:00

597 lines
21 KiB
PHP

<?php
/**
* Renders the HTML page that is sent to the client.
* @package core
*/
class page_renderer
{
/**
* The root HTML template that all pages are built from.
* @var string
* @package core
*/
public static $html_template = "<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>{title}</title>
<meta name='viewport' content='width=device-width, initial-scale=1' />
<meta name='generator' content='Pepperminty Wiki {version}' />
<meta name='application-name' content='Pepperminty Wiki {version}' />
<link rel='shortcut-icon' href='{favicon-url}' />
<link rel='icon' href='{favicon-url}' />
{header-html}
</head>
<body>
{body}
<!-- Took {generation-time-taken}ms to generate -->
</body>
</html>
";
/**
* The main content template that is used to render normal wiki pages.
* @var string
* @package core
*/
public static $main_content_template = "{navigation-bar}
<h1 class='sitename'>{sitename}</h1>
<main>
{content}
</main>
{extra}
<footer>
<p>{footer-message}</p>
<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>
<p>Your local friendly moderators are {admins-name-list}.</p>
<p>This wiki is managed by <a href='mailto:{admin-details-email}'>{admin-details-name}</a>.</p>
</footer>
{navigation-bar-bottom}
{all-pages-datalist}";
/**
* A specially minified content template that doesn't include the navbar and
* other elements not suitable for printing.
* @var string
* @package core
*/
public static $minimal_content_template = "<main class='printable'>{content}</main>
<footer class='printable'>
<hr class='footerdivider' />
<p><em>From {sitename}, which is managed by {admin-details-name}.</em></p>
<p>{footer-message}</p>
<p><em>Timed at {generation-date}</em></p>
<p><em>Powered by Pepperminty Wiki {version}.</em></p>
</footer>";
/**
* An array of items indicating the resources to ask the web server to push
* down to the client with HTTP/2.0 server push.
* Format: [ [type, path], [type, path], .... ]
* @var array[]
*/
protected static $http2_push_items = [];
/**
* A string of extrar HTML that should be included at the bottom of the page <head>.
* @var string
*/
private static $extraHeaderHTML = "";
/**
* The javascript snippets that will be included in the page.
* @var string[]
* @package core
*/
private static $jsSnippets = [];
/**
* The urls of the external javascript files that should be referenced
* by the page.
* @var string[]
* @package core
*/
private static $jsLinks = [];
/**
* The navigation bar divider.
* @package core
* @var string
*/
public static $nav_divider = "<span class='nav-divider inflexible'> | </span>";
/**
* An array of functions that have been registered to process the
* find / replace array before the page is rendered. Note that the function
* should take a *reference* to an array as its only argument.
* @var array
* @package core
*/
protected static $part_processors = [];
/**
* Registers a function as a part post processor.
* This function's use is more complicated to explain. Pepperminty Wiki
* renders pages with a very simple templating system. For example, in the
* template a page's content is denoted by `{content}`. A function
* registered here will be passed all the components of a page _just_
* before they are dropped into the template. Note that the function you
* pass in here should take a *reference* to the components, as the return
* value of the function passed is discarded.
* @package core
* @param callable $function The part preprocessor to register.
*/
public static function register_part_preprocessor($function) {
global $settings;
// Make sure that the function we are about to register is valid
if(!is_callable($function))
{
http_response_code(500);
$admin_email = hide_email($settings->admindetails_email);
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>."));
}
self::$part_processors[] = $function;
return true;
}
/**
* Renders a HTML page with the content specified.
* @package core
* @param string $title The title of the page.
* @param string $content The (HTML) content of the page.
* @param bool $body_template The HTML content template to use.
* @return string The rendered HTML, ready to send to the client :-)
*/
public static function render($title, $content, $body_template = false)
{
global $settings, $env, $start_time, $version;
// Hrm, we can't seem to get this working
// This example URL works: https://httpbin.org/response-headers?Server=httpbin&Content-Type=text%2Fplain%3B+charset%3DUTF-8&Server-Timing=sql-1%3Bdesc%3D%22MySQL%20lookup%20Server%22%3Bdur%3D100%2Csql-2%3Bdur%3D900%3Bdesc%3D%22MySQL%20shard%20Server%20%231%22%2Cfs%3Bdur%3D600%3Bdesc%3D%22FileSystem%22%2Ccache%3Bdur%3D300%3Bdesc%3D%22Cache%22%2Cother%3Bdur%3D200%3Bdesc%3D%22Database%20Write%22%2Cother%3Bdur%3D110%3Bdesc%3D%22Database%20Read%22%2Ccpu%3Bdur%3D1230%3Bdesc%3D%22Total%20CPU%22
// ..... but setting headers here doesn't (though we haven't tried sending an identical header to the above example yet)
// header("Server-Timing: foo;desc=\"Test\";dur=123");
// header("Server-Timing: ".metrics2servertiming($env->perfdata));
if($body_template === false)
$body_template = self::$main_content_template;
if(strlen($settings->logo_url) > 0) {
// A logo url has been specified
$logo_html = "<img aria-hidden='true' class='logo" . (isset($_GET["printable"]) ? " small" : "") . "' src='$settings->logo_url' />";
switch($settings->logo_position) {
case "left":
$logo_html = "$logo_html $settings->sitename";
break;
case "right":
$logo_html .= " $settings->sitename";
break;
default:
throw new Exception("Invalid logo_position '$settings->logo_position'. Valid values are either \"left\" or \"right\" and are case sensitive.");
}
}
// Push the logo via HTTP/2.0 if possible
if($settings->favicon[0] === "/") self::$http2_push_items[] = ["image", $settings->favicon];
$parts = [
"{body}" => $body_template,
"{sitename}" => $logo_html,
"{version}" => $version,
"{favicon-url}" => $settings->favicon,
"{header-html}" => self::get_header_html(),
"{navigation-bar}" => self::render_navigation_bar($settings->nav_links, $settings->nav_links_extra, "top"),
"{navigation-bar-bottom}" => self::render_navigation_bar($settings->nav_links_bottom, [], "bottom"),
"{admin-details-name}" => $settings->admindetails_name,
"{admin-details-email}" => $settings->admindetails_email,
"{admins-name-list}" => implode(", ", array_map(function($username) { return page_renderer::render_username($username); }, $settings->admins)),
"{generation-date}" => date("l jS \of F Y \a\\t h:ia T"),
"{all-pages-datalist}" => self::generate_all_pages_datalist(),
"{footer-message}" => $settings->footer_message,
/// Secondary Parts ///
"{content}" => $content,
"{extra}" => "",
"{title}" => $title,
];
// Pass the parts through the part processors
foreach(self::$part_processors as $function) {
$function($parts);
}
$result = self::$html_template;
$result = str_replace(array_keys($parts), array_values($parts), $result);
$result = str_replace("{generation-time-taken}", round((microtime(true) - $start_time)*1000, 2), $result);
// Send the HTTP/2.0 server push indicators if possible - but not if we're sending a redirect page
if(!headers_sent() && (http_response_code() < 300 || http_response_code() >= 400)) self::send_server_push_indicators();
return $result;
}
/**
* Renders a normal HTML page.
* @package core
* @param string $title The title of the page.
* @param string $content The content of the page.
* @return string The rendered page.
*/
public static function render_main($title, $content) {
return self::render($title, $content, self::$main_content_template);
}
/**
* Renders a minimal HTML page. Useful for printable pages.
* @package core
* @param string $title The title of the page.
* @param string $content The content of the page.
* @return string The rendered page.
*/
public static function render_minimal($title, $content) {
return self::render($title, $content, self::$minimal_content_template);
}
/**
* Sends the currently registered HTTP2 server push items to the client.
* @return int|false The number of resource hints included in the link: header, or false if server pushing is disabled.
*/
public static function send_server_push_indicators() {
global $settings;
if(!$settings->http2_server_push)
return false;
// Render the preload directives
$link_header_parts = [];
foreach(self::$http2_push_items as $push_item)
$link_header_parts[] = "<{$push_item[1]}>; rel=preload; as={$push_item[0]}";
// Send them in a link: header
if(!empty($link_header_parts))
header("link: " . implode(", ", $link_header_parts));
return count(self::$http2_push_items);
}
/**
* Renders the header HTML.
* @package core
* @return string The rendered HTML that goes in the header.
*/
public static function get_header_html()
{
global $settings;
$result = self::$extraHeaderHTML;
$result .= self::get_css_as_html();
$result .= self::_get_js();
if(!empty($settings->theme_colour))
$result .= "\t\t<meta name='theme-color' content='$settings->theme_colour' />\n";
// We can't use module_exists here because sometimes global $modules
// hasn't populated yet when we get called O.o
if(class_exists("search"))
$result .= "\t\t<link rel='search' type='application/opensearchdescription+xml' href='?action=opensearch-description' title='$settings->sitename Search' />\n";
if(!empty($settings->enable_math_rendering)) {
$result .= "<script type='text/x-mathjax-config'>
MathJax.Hub.Config({
tex2jax: {
inlineMath: [ ['$','$'], ['\\\\(','\\\\)'] ],
processEscapes: true,
skipTags: ['script','noscript','style','textarea','pre','code']
}
});
</script>";
}
return $result;
}
/**
* Figures out whether $settings->css is a url, or a string of css.
* A url is something starting with "protocol://" or simply a "/".
* Before v0.20, this method took no arguments and checked $settings->css directly.
* @apiVerion 0.20.0
* @param string $str The CSS string to check.
* @return bool True if it's a url - false if we assume it's a string of css.
*/
public static function is_css_url($str) {
global $settings;
return preg_match("/^[^\/]*\/\/|^\/[^\*]/", $str);
}
/**
* Renders all the CSS as HTML.
* @package core
* @return string The css as HTML, ready to be included in the HTML header.
*/
public static function get_css_as_html()
{
global $settings, $defaultCSS;
$result = "";
$css = "";
if(self::is_css_url($settings->css)) {
if($settings->css[0] === "/") // Push it if it's a relative resource
self::add_server_push_indicator("style", $settings->css);
$result .= "<link rel='stylesheet' href='$settings->css' />\n";
} else {
$css .= $settings->css == "auto" ? $defaultCSS : $settings->css;
if(!empty($settings->optimize_pages))
$css = minify_css($css);
}
if(!empty($settings->css_custom)) {
if(self::is_css_url($settings->css_custom)) {
if($settings->css_custom[0] === "/") // Push it if it's a relative resource
self::add_server_push_indicator("style", $settings->css);
$result .= "<link rel='stylesheet' href='$settings->css_custom' />\n";
}
$css .= "\n/*** Custom CSS ***/\n";
$css .= !empty($settings->optimize_pages) ? minify_css($settings->css_custom) : $settings->css_custom;
$css .= "\n/******************/";
}
$result .= "<style>\n$css\n</style>\n";
return $result;
}
/**
* Adds the specified url to a javascript file as a reference to the page.
* @package core
* @param string $scriptUrl The url of the javascript file to reference.
*/
public static function add_js_link(string $scriptUrl) {
static::$jsLinks[] = $scriptUrl;
}
/**
* Adds a javascript snippet to the page.
* @package core
* @param string $script The snippet of javascript to add.
*/
public static function add_js_snippet(string $script) {
static::$jsSnippets[] = $script;
}
/**
* Renders the included javascript header for inclusion in the final
* rendered page.
* @package core
* @return string The rendered javascript ready for inclusion in the page.
*/
private static function _get_js() {
$result = "<!-- Javascript -->\n";
foreach(static::$jsSnippets as $snippet)
$result .= "<script defer>\n$snippet\n</script>\n";
foreach(static::$jsLinks as $link) {
// Push it via HTTP/2.0 if it's relative
if($link[0] === "/") self::add_server_push_indicator("script", $link);
$result .= "<script src='" . $link . "' defer></script>\n";
}
return $result;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Adds a string of HTML to the header of the rendered page.
* @param string $html The string of HTML to add.
*/
public static function add_header_html($html) {
self::$extraHeaderHTML .= $html;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Adds a resource to the list of items to indicate that the web server should send via HTTP/2.0 Server Push.
* Note: Only specify static files here, as you might end up with strange (and possibly dangerous) results!
* @param string $type The resource type. See https://fetch.spec.whatwg.org/#concept-request-destination for more information.
* @param string $path The *relative url path* to the resource.
*/
public static function add_server_push_indicator($type, $path) {
self::$http2_push_items[] = [ $type, $path ];
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Renders a navigation bar from an array of links. See
* $settings->nav_links for format information.
* @package core
* @param array $nav_links The links to add to the navigation bar.
* @param array $nav_links_extra The extra nav links to add to
* the "More..." menu.
* @param string $class The class(es) to assign to the rendered
* navigation bar.
*/
public static function render_navigation_bar($nav_links, $nav_links_extra, $class = "") {
global $settings, $env;
$mega_menu = false;
if(is_object($nav_links)) {
$mega_menu = true;
$class = trim("$class mega-menu");
$links_list = [];
$keys = array_keys(get_object_vars($nav_links));
foreach($keys as $key) {
$links_list[] = "category\0$key";
$links_list = array_merge(
$links_list,
$nav_links->$key
);
}
$nav_links = $links_list;
}
$result = "<nav class='$class'>\n";
$is_first_category = true;
// Loop over all the navigation links
foreach($nav_links as $item) {
if(!is_string($item)) {
// Output the item as a link to a url
$result .= "<span><a href='" . str_replace("{page}", rawurlencode($env->page), $item[1]) . "'>$item[0]</a></span>";
continue;
}
// Extract the item key - a null character can be used to separate extra data from an item type
$item_key = $item;
if(strpos($item_key, "\0") !== false)
$item_key = substr($item_key, 0, strpos($item_key, "\0"));
// The item is a string
switch($item_key) {
//keywords
case "user-status": // Renders the user status box
if($env->is_logged_in) {
$result .= "<span class='inflexible logged-in" . ($env->is_logged_in ? " moderator" : " normal-user") . "'>";
if(module_exists("feature-user-preferences")) {
$result .= "<a href='?action=user-preferences' aria-label='Change user preferences'>$settings->user_preferences_button_text</a>";
}
$result .= self::render_username($env->user);
$result .= " <small>(<a href='index.php?action=logout'>Logout</a>)</small>";
$result .= "</span>";
//$result .= page_renderer::$nav_divider;
}
else {
$returnto_url = $env->action !== "logout" ? $_SERVER["REQUEST_URI"] : "?action=view&page=" . rawurlencode($settings->defaultpage);
$result .= "<span class='not-logged-in'><a href='index.php?action=login&returnto=" . rawurlencode($returnto_url) . "' rel='nofollow'>Login</a></span>";
}
break;
case "search": // Renders the search bar
$result .= "<span class='inflexible'><form method='get' action='index.php' style='display: inline;'><input type='search' name='page' list='allpages' placeholder='&#x1f50e; Type a page name here and hit enter' /><input type='hidden' name='search-redirect' value='true' /></form></span>";
break;
case "divider": // Renders a divider
$result .= page_renderer::$nav_divider;
break;
case "menu": // Renders the "More..." menu
$result .= "<span class='inflexible nav-more'><label for='more-menu-toggler'>More...</label>
<input type='checkbox' class='off-screen' id='more-menu-toggler' />";
$result .= page_renderer::render_navigation_bar($nav_links_extra, [], "nav-more-menu");
$result .= "</span>";
break;
case "category": // Renders a category header
if(!$is_first_category) $result .= "</span>";
$result .= "<span class='category'><strong>" . substr($item, 9) . "</strong>";
$is_first_category = false;
break;
// It isn't a keyword, so just output it directly
default:
$result .= "<span>$item</span>";
}
}
if($mega_menu) $result .= "</span>";
$result .= "</nav>";
return $result;
}
/**
* Renders a username for inclusion in a page.
* @package core
* @param string $name The username to render.
* @return string The username rendered in HTML.
*/
public static function render_username($name) {
global $settings;
$result = "";
$result .= "<a href='?page=" . rawurlencode(get_user_pagename($name)) . "'>";
if($settings->avatars_show)
$result .= "<img class='avatar' aria-hidden='true' src='?action=avatar&user=" . urlencode($name) . "&size=$settings->avatars_size' /> ";
if(in_array($name, $settings->admins))
$result .= $settings->admindisplaychar;
$result .= htmlentities($name);
$result .= "</a>";
return $result;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Renders the datalist for the search box as HTML.
* @package core
* @return string The search box datalist as HTML.
*/
public static function generate_all_pages_datalist() {
global $settings, $pageindex;
$result = "<datalist id='allpages'>\n";
// If dynamic page sugggestions are enabled, then we should send a loading message instead.
if($settings->dynamic_page_suggestion_count > 0) {
$result .= "<option value='Loading suggestions...' />";
} else {
$arrayPageIndex = get_object_vars($pageindex);
$sorter = new Collator("");
uksort($arrayPageIndex, function($a, $b) use($sorter) : int {
return $sorter->compare($a, $b);
});
foreach($arrayPageIndex as $pagename => $pagedetails) {
$escapedPageName = str_replace('"', '&quot;', $pagename);
$result .= "\t\t\t<option value=\"$escapedPageName\" />\n";
}
}
$result .= "\t\t</datalist>";
return $result;
}
}
// HTTP/2.0 Server Push static items
foreach($settings->http2_server_push_items as $push_item) {
page_renderer::add_server_push_indicator($push_item[0], $push_item[1]);
}
// Math rendering support
if(!empty($settings->enable_math_rendering))
{
page_renderer::add_js_link("https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_CHTML");
}
// alt+enter support in the search box
page_renderer::add_js_snippet('// Alt + Enter support in the top search box
window.addEventListener("load", function(event) {
let search_box = document.querySelector("input[type=search]"),
alt_pressed = false;
document.addEventListener("keyup", (event) => {
if(event.keyCode !== 18) return;
alt_pressed = false;
console.info("[search box/alt-tracker] alt released");
});
document.addEventListener("keydown", (event) => {
if(event.keyCode !== 18) return;
alt_pressed = true;
console.info("[search box/alt-tracker] alt pressed");
});
search_box.form.addEventListener("submit", (event) => {
if(!alt_pressed) {
console.log("[search box/form] Alt wasn\'t pressed");
event.target.removeAttribute("target");
return;
}
console.log("[search box/form] Fiddling target");
event.target.setAttribute("target", "_blank");
setTimeout(() => {
alt_pressed = false;
}, 100);
});
});
');