cavepaintingsFork/core/basepage.php

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<?php declare(strict_types=1);
require_once "core/event.php";
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/**
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* \page themes Themes
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*
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* Each extension has a theme with a specific name -- eg. the extension Setup
* which is stored in ext/setup/main.php will have a theme called SetupTheme
* stored in ext/setup/theme.php. If you want to customise it, create a class
* in the file themes/mytheme/setup.theme.php called CustomSetupTheme which
* extends SetupTheme and overrides some of its methods.
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*
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* Generally an extension should only deal with processing data; whenever it
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* wants to display something, it should pass the data to be displayed to the
* theme object, and the theme will add the data into the global $page
* structure.
*
* A page should make sure that all the data it outputs is free from dangerous
* data by using html_escape(), url_escape(), or int_escape() as appropriate.
*
* Because some HTML can be placed anywhere according to the theme, coming up
* with the correct way to link to a page can be hard -- thus we have the
* make_link() function, which will take a path like "post/list" and turn it
* into a full and correct link, eg /myboard/post/list, /foo/index.php?q=post/list,
* etc depending on how things are set up. This should always be used to link
* to pages rather than hardcoding a path.
*
* Various other common functions are available as part of the Themelet class.
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*/
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abstract class PageMode
{
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const REDIRECT = 'redirect';
const DATA = 'data';
const PAGE = 'page';
const FILE = 'file';
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}
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/**
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* Class Page
*
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* A data structure for holding all the bits of data that make up a page.
*
* The various extensions all add whatever they want to this structure,
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* then Layout turns it into HTML.
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*/
class BasePage
{
/** @var string */
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public $mode = PageMode::PAGE;
/** @var string */
public $type = "text/html; charset=utf-8";
/**
* Set what this page should do; "page", "data", or "redirect".
*/
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public function set_mode(string $mode): void
{
$this->mode = $mode;
}
/**
* Set the page's MIME type.
*/
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public function set_type(string $type): void
{
$this->type = $type;
}
public function __construct()
{
if (@$_GET["flash"]) {
$this->flash[] = $_GET['flash'];
unset($_GET["flash"]);
}
}
// ==============================================
/** @var string; public only for unit test */
public $data = "";
/** @var string; */
public $file = null;
/** @var string; public only for unit test */
public $filename = null;
private $disposition = null;
/**
* Set the raw data to be sent.
*/
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public function set_data(string $data): void
{
$this->data = $data;
}
public function set_file(string $file): void
{
$this->file = $file;
}
/**
* Set the recommended download filename.
*/
public function set_filename(string $filename, string $disposition = "attachment"): void
{
$this->filename = $filename;
$this->disposition = $disposition;
}
// ==============================================
/** @var string */
private $redirect = "";
/**
* Set the URL to redirect to (remember to use make_link() if linking
* to a page in the same site).
*/
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public function set_redirect(string $redirect): void
{
$this->redirect = $redirect;
}
// ==============================================
/** @var int */
public $code = 200;
/** @var string */
public $title = "";
/** @var string */
public $heading = "";
/** @var string */
public $subheading = "";
/** @var string */
public $quicknav = "";
/** @var string[] */
public $html_headers = [];
/** @var string[] */
public $http_headers = [];
/** @var string[][] */
public $cookies = [];
/** @var Block[] */
public $blocks = [];
/** @var string[] */
public $flash = [];
/**
* Set the HTTP status code
*/
public function set_code(int $code): void
{
$this->code = $code;
}
public function set_title(string $title): void
{
$this->title = $title;
}
public function set_heading(string $heading): void
{
$this->heading = $heading;
}
public function set_subheading(string $subheading): void
{
$this->subheading = $subheading;
}
public function flash(string $message): void
{
$this->flash[] = $message;
}
/**
* Add a line to the HTML head section.
*/
public function add_html_header(string $line, int $position = 50): void
{
while (isset($this->html_headers[$position])) {
$position++;
}
$this->html_headers[$position] = $line;
}
/**
* Add a http header to be sent to the client.
*/
public function add_http_header(string $line, int $position = 50): void
{
while (isset($this->http_headers[$position])) {
$position++;
}
$this->http_headers[$position] = $line;
}
/**
* The counterpart for get_cookie, this works like php's
* setcookie method, but prepends the site-wide cookie prefix to
* the $name argument before doing anything.
*/
public function add_cookie(string $name, string $value, int $time, string $path): void
{
$full_name = COOKIE_PREFIX . "_" . $name;
$this->cookies[] = [$full_name, $value, $time, $path];
}
public function get_cookie(string $name): ?string
{
$full_name = COOKIE_PREFIX . "_" . $name;
if (isset($_COOKIE[$full_name])) {
return $_COOKIE[$full_name];
} else {
return null;
}
}
/**
* Get all the HTML headers that are currently set and return as a string.
*/
public function get_all_html_headers(): string
{
$data = '';
ksort($this->html_headers);
foreach ($this->html_headers as $line) {
$data .= "\t\t" . $line . "\n";
}
return $data;
}
/**
* Removes all currently set HTML headers (Be careful..).
*/
public function delete_all_html_headers(): void
{
$this->html_headers = [];
}
/**
* Add a Block of data to the page.
*/
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public function add_block(Block $block): void
{
$this->blocks[] = $block;
}
// ==============================================
/**
* Display the page according to the mode and data given.
*/
public function display(): void
{
global $page, $user;
header("HTTP/1.0 {$this->code} Shimmie");
header("Content-type: " . $this->type);
header("X-Powered-By: Shimmie-" . VERSION);
if (!headers_sent()) {
foreach ($this->http_headers as $head) {
header($head);
}
foreach ($this->cookies as $c) {
setcookie($c[0], $c[1], $c[2], $c[3]);
}
} else {
print "Error: Headers have already been sent to the client.";
}
switch ($this->mode) {
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case PageMode::PAGE:
if (CACHE_HTTP) {
header("Vary: Cookie, Accept-Encoding");
if ($user->is_anonymous() && $_SERVER["REQUEST_METHOD"] == "GET") {
header("Cache-control: public, max-age=600");
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 600) . ' GMT');
} else {
#header("Cache-control: private, max-age=0");
header("Cache-control: no-cache");
header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 600) . ' GMT');
}
}
#else {
# header("Cache-control: no-cache");
# header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 600) . ' GMT');
#}
usort($this->blocks, "blockcmp");
$pnbe = new PageNavBuildingEvent();
send_event($pnbe);
$nav_links = $pnbe->links;
$active_link = null;
// To save on event calls, we check if one of the top-level links has already been marked as active
foreach ($nav_links as $link) {
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if ($link->active===true) {
$active_link = $link;
break;
}
}
$sub_links = null;
// If one is, we just query for sub-menu options under that one tab
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if ($active_link!==null) {
$psnbe = new PageSubNavBuildingEvent($active_link->name);
send_event($psnbe);
$sub_links = $psnbe->links;
} else {
// Otherwise we query for the sub-items under each of the tabs
foreach ($nav_links as $link) {
$psnbe = new PageSubNavBuildingEvent($link->name);
send_event($psnbe);
// Now we check for a current link so we can identify the sub-links to show
foreach ($psnbe->links as $sub_link) {
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if ($sub_link->active===true) {
$sub_links = $psnbe->links;
break;
}
}
// If the active link has been detected, we break out
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if ($sub_links!==null) {
$link->active = true;
break;
}
}
}
$sub_links = $sub_links??[];
usort($nav_links, "sort_nav_links");
usort($sub_links, "sort_nav_links");
$this->add_auto_html_headers();
$layout = new Layout();
$layout->display_page($page, $nav_links, $sub_links);
break;
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case PageMode::DATA:
header("Content-Length: " . strlen($this->data));
if (!is_null($this->filename)) {
header('Content-Disposition: ' . $this->disposition . '; filename=' . $this->filename);
}
print $this->data;
break;
case PageMode::FILE:
if (!is_null($this->filename)) {
header('Content-Disposition: ' . $this->disposition . '; filename=' . $this->filename);
}
//https://gist.github.com/codler/3906826
$size = filesize($this->file); // File size
$length = $size; // Content length
$start = 0; // Start byte
$end = $size - 1; // End byte
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header("Content-Length: " . $size);
header('Accept-Ranges: bytes');
if (isset($_SERVER['HTTP_RANGE'])) {
$c_start = $start;
$c_end = $end;
list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
if (strpos($range, ',') !== false) {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
break;
}
if ($range == '-') {
$c_start = $size - substr($range, 1);
} else {
$range = explode('-', $range);
$c_start = $range[0];
$c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
}
$c_end = ($c_end > $end) ? $end : $c_end;
if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size) {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
break;
}
$start = $c_start;
$end = $c_end;
$length = $end - $start + 1;
header('HTTP/1.1 206 Partial Content');
}
header("Content-Range: bytes $start-$end/$size");
header("Content-Length: " . $length);
$fp = fopen($this->file, 'r');
try {
fseek($fp, $start);
$buffer = 1024 * 64;
while (!feof($fp) && ($p = ftell($fp)) <= $end) {
if ($p + $buffer > $end) {
$buffer = $end - $p + 1;
}
set_time_limit(0);
echo fread($fp, $buffer);
flush();
// After flush, we can tell if the client browser has disconnected.
// This means we can start sending a large file, and if we detect they disappeared
// then we can just stop and not waste any more resources or bandwidth.
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if (connection_status() != 0) {
break;
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}
}
} finally {
fclose($fp);
}
break;
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case PageMode::REDIRECT:
if ($this->flash) {
$this->redirect .= (strpos($this->redirect, "?") === false) ? "?" : "&";
$this->redirect .= "flash=" . url_escape(implode("\n", $this->flash));
}
header('Location: ' . $this->redirect);
print 'You should be redirected to <a href="' . $this->redirect . '">' . $this->redirect . '</a>';
break;
default:
print "Invalid page mode";
break;
}
}
/**
* This function grabs all the CSS and JavaScript files sprinkled throughout Shimmie's folders,
* concatenates them together into two large files (one for CSS and one for JS) and then stores
* them in the /cache/ directory for serving to the user.
*
* Why do this? Two reasons:
* 1. Reduces the number of files the user's browser needs to download.
* 2. Allows these cached files to be compressed/minified by the admin.
*
* TODO: This should really be configurable somehow...
*/
public function add_auto_html_headers(): void
{
global $config;
$data_href = get_base_href();
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$theme_name = $config->get_string(SetupConfig::THEME, 'default');
$this->add_html_header("<script type='text/javascript'>base_href = '$data_href';</script>", 40);
# static handler will map these to themes/foo/static/bar.ico or ext/handle_static/static/bar.ico
$this->add_html_header("<link rel='icon' type='image/x-icon' href='$data_href/favicon.ico'>", 41);
$this->add_html_header("<link rel='apple-touch-icon' href='$data_href/apple-touch-icon.png'>", 42);
//We use $config_latest to make sure cache is reset if config is ever updated.
$config_latest = 0;
foreach (zglob("data/config/*") as $conf) {
$config_latest = max($config_latest, filemtime($conf));
}
/*** Generate CSS cache files ***/
$css_latest = $config_latest;
$css_files = array_merge(
zglob("ext/{" . Extension::get_enabled_extensions_as_string() . "}/style.css"),
zglob("themes/$theme_name/style.css")
);
foreach ($css_files as $css) {
$css_latest = max($css_latest, filemtime($css));
}
$css_md5 = md5(serialize($css_files));
$css_cache_file = data_path("cache/style/{$theme_name}.{$css_latest}.{$css_md5}.css");
if (!file_exists($css_cache_file)) {
$css_data = "";
foreach ($css_files as $file) {
$file_data = file_get_contents($file);
$pattern = '/url[\s]*\([\s]*["\']?([^"\'\)]+)["\']?[\s]*\)/';
$replace = 'url("../../../' . dirname($file) . '/$1")';
$file_data = preg_replace($pattern, $replace, $file_data);
$css_data .= $file_data . "\n";
}
file_put_contents($css_cache_file, $css_data);
}
$this->add_html_header("<link rel='stylesheet' href='$data_href/$css_cache_file' type='text/css'>", 43);
/*** Generate JS cache files ***/
$js_latest = $config_latest;
$js_files = array_merge(
[
"vendor/bower-asset/jquery/dist/jquery.min.js",
"vendor/bower-asset/jquery-timeago/jquery.timeago.js",
"vendor/bower-asset/tablesorter/jquery.tablesorter.min.js",
"vendor/bower-asset/js-cookie/src/js.cookie.js",
"ext/handle_static/modernizr-3.3.1.custom.js",
],
zglob("ext/{" . Extension::get_enabled_extensions_as_string() . "}/script.js"),
zglob("themes/$theme_name/script.js")
);
foreach ($js_files as $js) {
$js_latest = max($js_latest, filemtime($js));
}
$js_md5 = md5(serialize($js_files));
$js_cache_file = data_path("cache/script/{$theme_name}.{$js_latest}.{$js_md5}.js");
if (!file_exists($js_cache_file)) {
$js_data = "";
foreach ($js_files as $file) {
$js_data .= file_get_contents($file) . "\n";
}
file_put_contents($js_cache_file, $js_data);
}
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$this->add_html_header("<script defer src='$data_href/$js_cache_file' type='text/javascript'></script>", 44);
}
}
class PageNavBuildingEvent extends Event
{
public $links = [];
public function add_nav_link(string $name, Link $link, string $desc, ?bool $active = null, int $order = 50)
{
$this->links[] = new NavLink($name, $link, $desc, $active, $order);
}
}
class PageSubNavBuildingEvent extends Event
{
public $parent;
public $links = [];
public function __construct(string $parent)
{
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parent::__construct();
$this->parent= $parent;
}
public function add_nav_link(string $name, Link $link, string $desc, ?bool $active = null, int $order = 50)
{
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$this->links[] = new NavLink($name, $link, $desc, $active, $order);
}
}
class NavLink
{
public $name;
public $link;
public $description;
public $order;
public $active = false;
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public function __construct(String $name, Link $link, String $description, ?bool $active = null, int $order = 50)
{
global $config;
$this->name = $name;
$this->link = $link;
$this->description = $description;
$this->order = $order;
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if ($active==null) {
$query = ltrim(_get_query(), "/");
if ($query === "") {
// This indicates the front page, so we check what's set as the front page
$front_page = trim($config->get_string(SetupConfig::FRONT_PAGE), "/");
if ($front_page === $link->page) {
$this->active = true;
} else {
$this->active = self::is_active([$link->page], $front_page);
}
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} elseif ($query===$link->page) {
$this->active = true;
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} else {
$this->active = self::is_active([$link->page]);
}
} else {
$this->active = $active;
}
}
public static function is_active(array $pages_matched, string $url = null): bool
{
/**
* Woo! We can actually SEE THE CURRENT PAGE!! (well... see it highlighted in the menu.)
*/
$url = $url??ltrim(_get_query(), "/");
$re1='.*?';
$re2='((?:[a-z][a-z_]+))';
if (preg_match_all("/".$re1.$re2."/is", $url, $matches)) {
$url=$matches[1][0];
}
$count_pages_matched = count($pages_matched);
for ($i=0; $i < $count_pages_matched; $i++) {
if ($url == $pages_matched[$i]) {
return true;
}
}
return false;
}
}
function sort_nav_links(NavLink $a, NavLink $b)
{
return $a->order - $b->order;
}