430 lines
13 KiB
PHP
430 lines
13 KiB
PHP
<?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
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* which is stored in ext/setup/main.php will have a theme called SetupTheme
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* stored in ext/setup/theme.php. If you want to customise it, create a class
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* in the file themes/mytheme/setup.theme.php called CustomSetupTheme which
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* 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
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* theme object, and the theme will add the data into the global $page
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* structure.
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*
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* A page should make sure that all the data it outputs is free from dangerous
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* data by using html_escape(), url_escape(), or int_escape() as appropriate.
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*
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* Because some HTML can be placed anywhere according to the theme, coming up
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* with the correct way to link to a page can be hard -- thus we have the
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* make_link() function, which will take a path like "post/list" and turn it
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* into a full and correct link, eg /myboard/post/list, /foo/index.php?q=post/list,
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* etc depending on how things are set up. This should always be used to link
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* to pages rather than hardcoding a path.
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*
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* Various other common functions are available as part of the Themelet class.
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*/
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/**
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* A data structure for holding all the bits of data that make up a page.
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*
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* 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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*/
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class Page {
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/** @name Overall */
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//@{
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/** @private */
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var $mode = "page";
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/** @private */
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var $type = "text/html";
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/**
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* Set what this page should do; "page", "data", or "redirect".
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*/
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public function set_mode($mode) {
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$this->mode = $mode;
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}
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/**
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* Set the page's MIME type
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*/
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public function set_type($type) {
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$this->type = $type;
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}
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//@}
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// ==============================================
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/** @name "data" mode */
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//@{
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/** @private */
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var $data = "";
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/** @private */
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var $filename = null;
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/**
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* Set the raw data to be sent
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*/
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public function set_data($data) {
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$this->data = $data;
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}
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/**
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* Set the recommended download filename
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*/
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public function set_filename($filename) {
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$this->filename = $filename;
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}
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//@}
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// ==============================================
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/** @name "redirect" mode */
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//@{
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/** @private */
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var $redirect = "";
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/**
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* Set the URL to redirect to (remember to use make_link() if linking
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* to a page in the same site)
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*/
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public function set_redirect($redirect) {
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$this->redirect = $redirect;
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}
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//@}
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// ==============================================
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/** @name "page" mode */
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//@{
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/** @privatesection */
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var $title = "";
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var $heading = "";
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var $subheading = "";
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var $quicknav = "";
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var $html_headers = array();
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var $http_headers = array();
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var $blocks = array();
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/** @publicsection */
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/**
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* Set the window title
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*/
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public function set_title($title) {
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$this->title = $title;
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}
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/**
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* Set the main heading
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*/
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public function set_heading($heading) {
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$this->heading = $heading;
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}
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/**
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* Set the sub heading
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*/
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public function set_subheading($subheading) {
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$this->subheading = $subheading;
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}
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/**
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* Add a line to the HTML head section
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*/
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public function add_html_header($line, $position=50) {
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while(isset($this->html_headers[$position])) $position++;
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$this->html_headers[$position] = $line;
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}
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/**
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* Add a http header to be sent to the client.
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*/
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public function add_http_header($line, $position=50) {
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while(isset($this->http_headers[$position])) $position++;
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$this->http_headers[$position] = $line;
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}
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/**
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* Get all the HTML headers that are currently set and return as a string.
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*/
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public function get_all_html_headers() {
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$data = '';
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foreach ($this->html_headers as $line) {
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$data .= $line . "\n";
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}
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return $data;
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}
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/**
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* Removes all currently set HTML headers. (Be careful..)
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*/
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public function delete_all_html_headers() {
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$this->html_headers = array();
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}
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/**
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* Add a Block of data
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*/
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public function add_block(Block $block) {
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$this->blocks[] = $block;
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}
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//@}
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// ==============================================
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/**
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* Display the page according to the mode and data given
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*/
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public function display() {
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global $page, $user;
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header("Content-type: ".$this->type);
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header("X-Powered-By: SCore-".SCORE_VERSION);
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if (!headers_sent()) {
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foreach($this->http_headers as $head){ header($head); }
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} else {
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print "Error: Headers have already been sent to the client.";
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}
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switch($this->mode) {
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case "page":
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header("Vary: Cookie, Accept-Encoding");
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if(CACHE_HTTP) {
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if($user->is_anonymous() && $_SERVER["REQUEST_METHOD"] == "GET") {
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header("Cache-control: public, max-age=600");
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 600) . ' GMT');
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}
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else {
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#header("Cache-control: private, max-age=0");
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header("Cache-control: no-cache");
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 600) . ' GMT');
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}
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}
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else {
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header("Cache-control: no-cache");
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 600) . ' GMT');
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}
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usort($this->blocks, "blockcmp");
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$this->add_auto_html_headers();
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$layout = new Layout();
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$layout->display_page($page);
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break;
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case "data":
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header("Content-Length: ".strlen($this->data));
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if(!is_null($this->filename)) {
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header('Content-Disposition: attachment; filename='.$this->filename);
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}
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print $this->data;
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break;
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case "redirect":
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header("Location: {$this->redirect}");
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print "You should be redirected to <a href='{$this->redirect}'>{$this->redirect}</a>";
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break;
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default:
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print "Invalid page mode";
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break;
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}
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}
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protected function add_auto_html_headers() {
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$data_href = get_base_href();
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/* Attempt to cache the CSS & JavaScript files */
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if ($this->add_cached_auto_html_headers() === FALSE) {
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// caching failed, add all files to html_headers.
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foreach(glob("lib/*.css") as $css) {
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$this->add_html_header("<link rel='stylesheet' href='$data_href/$css' type='text/css'>");
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}
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$css_files = glob("ext/*/style.css");
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if($css_files) {
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foreach($css_files as $css_file) {
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$this->add_html_header("<link rel='stylesheet' href='$data_href/$css_file' type='text/css'>");
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}
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}
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foreach(glob("lib/*.js") as $js) {
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$this->add_html_header("<script src='$data_href/$js' type='text/javascript'></script>");
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}
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$js_files = glob("ext/*/script.js");
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if($js_files) {
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foreach($js_files as $js_file) {
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$this->add_html_header("<script src='$data_href/$js_file' type='text/javascript'></script>");
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}
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}
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}
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}
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/**
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* Automatic caching of CSS and Javascript files
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*
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* Allows site admins to have Shimmie automatically cache and minify all CSS and JS files.
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* This is done to reduce the number of HTTP requests (recommended by the Yahoo high-performance
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* guidelines). It combines all of the CSS and JavaScript files into one for each type, and
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* stores them in cached files to serve the client. Changes to the CSS or JavaScript files are
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* caught by taking the md5sum of the concatenated files.
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*
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* Note: This can be somewhat problematic, as it edits the links to your CSS files (as well
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* as the links to images inside them).
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* Also, the directory cache directory needs to be writeable by the php/webserver user.
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* PLEASE: Ensure that you test your site out throughly after enabling this module!
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* Either that, or don't use this module unless you are sure of what it is doing.
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*
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* TODO: Add support for minify-ing CSS and Javascript files. (similar to Minify. See: http://code.google.com/p/minify/ or https://github.com/mrclay/minify)
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* TODO: For performance reasons: Before performing the regex's, compute the md5 of the CSS & JS files and store somewhere to check later.
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*
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* @return
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* This function returns FALSE if it failed to cache the files,
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* and returns TRUE if it was successful.
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*/
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private function add_cached_auto_html_headers()
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{
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global $config;
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if (!$config->get_bool("autocache_css") && !$config->get_bool("autocache_js")) {
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return false; // caching disabled
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}
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$cache_location = $config->get_string("autocache_location", 'data/cache');
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// Detect is there is a trailing slash, and add one if not.
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$cache_location = ((strrpos($cache_location, '/') + 1) == strlen($cache_location)) ? $cache_location : $cache_location.'/';
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// Create directory if needed.
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if(!file_exists($cache_location)) {
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if (!mkdir($cache_location, 0750, true)) {
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return false; // failed to create directory
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}
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}
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$data_href = get_base_href();
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/* ----- CSS Files ----- */
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if ($config->get_bool("autocache_css"))
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{
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// First get all the CSS from the lib directory
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$contents_from_lib = '';
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$css_files = glob("lib/*.css");
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if($css_files) {
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foreach($css_files as $css_file) {
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$contents_from_lib .= file_get_contents($css_file);
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}
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// Can't directly cache the CSS files, as they might have relative locations to images, etc. in them.
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// We have to adjust the URLs accordingly before saving the cached file.
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$pattern = '/url[\s]*\([\s]*["\']?([^"\'\)]+)["\']?[\s]*\)/';
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$replace = 'url("../../lib/${1}")';
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$contents_from_lib = preg_replace($pattern, $replace, $contents_from_lib);
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}
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// Next get all the CSS from the extensions
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$contents_from_extensions = '';
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$css_files = glob("ext/*/style.css");
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if($css_files) {
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foreach($css_files as $css_file) {
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$contents_from_extensions .= file_get_contents($css_file);
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}
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// Can't directly cache the CSS files, as they might have relative locations to images, etc. in them.
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// We have to adjust the URLs accordingly before saving the cached file.
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$pattern = '/url[\s]*\([\s]*["\']?([^"\'\)]+)["\']?[\s]*\)/';
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$replace = 'url("../../${1}")';
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$contents_from_extensions = preg_replace($pattern, $replace, $contents_from_extensions);
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}
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// Combine the two
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$data = $contents_from_lib .' '. $contents_from_extensions;
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// Minify the CSS if enabled.
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if ($config->get_bool("autocache_min_css")){
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// not supported yet.
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// TODO: add support for Minifying CSS files.
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}
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// compute the MD5 sum of the concatenated CSS files
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$md5sum = md5($data);
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if (!file_exists($cache_location.$md5sum.'.css')) {
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// remove any old cached CSS files.
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$mask = '*.css';
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array_map( 'unlink', glob( $mask ) );
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// output the combined file
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if (file_put_contents($cache_location.$md5sum.'.css', $data, LOCK_EX) === FALSE) {
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return false; // failed to write the file
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}
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}
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// tell the client where to get the css cache file
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$this->add_html_header('<link rel="stylesheet" href="'.$data_href.'/'.$cache_location.$md5sum.'.css'.'" type="text/css">');
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} else {
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// Caching of CSS disabled.
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foreach(glob("lib/*.css") as $css) {
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$this->add_html_header("<link rel='stylesheet' href='$data_href/$css' type='text/css'>");
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}
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$css_files = glob("ext/*/style.css");
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if($css_files) {
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foreach($css_files as $css_file) {
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$this->add_html_header("<link rel='stylesheet' href='$data_href/$css_file' type='text/css'>");
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}
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}
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}
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/* ----- JavaScript Files ----- */
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if ($config->get_bool("autocache_js"))
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{
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$data = '';
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$js_files = glob("lib/*.js");
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if($js_files) {
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foreach($js_files as $js_file) {
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$data .= file_get_contents($js_file);
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}
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}
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$js_files = glob("ext/*/script.js");
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if($js_files) {
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foreach($js_files as $js_file) {
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$data .= file_get_contents($js_file);
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}
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}
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// Minify the JS if enabled.
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if ($config->get_bool("autocache_min_js")){
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// not supported yet.
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// TODO: add support for Minifying CSS files.
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}
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// compute the MD5 sum of the concatenated JavaScript files
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$md5sum = md5($data);
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if (!file_exists($cache_location.$md5sum.'.js')) {
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// remove any old cached js files.
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$mask = '*.js';
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array_map( 'unlink', glob( $mask ) );
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// output the combined file
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if (file_put_contents($cache_location.$md5sum.'.js', $data, LOCK_EX) === FALSE) {
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return false;
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}
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}
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// tell the client where to get the js cache file
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$this->add_html_header('<script src="'.$data_href.'/'.$cache_location.$md5sum.'.js'.'" type="text/javascript"></script>');
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} else {
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// Caching of Javascript disabled.
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foreach(glob("lib/*.js") as $js) {
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$this->add_html_header("<script src='$data_href/$js' type='text/javascript'></script>");
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}
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$js_files = glob("ext/*/script.js");
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if($js_files) {
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foreach($js_files as $js_file) {
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$this->add_html_header("<script src='$data_href/$js_file' type='text/javascript'></script>");
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}
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}
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}
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return true;
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}
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}
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?>
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