Pepperminty-Wiki/modules/page-view.php

<?php
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

register_module([
	"name" => "Page viewer",
	"version" => "0.16.11",
	"author" => "Starbeamrainbowlabs",
	"description" => "Allows you to view pages. You really should include this one.",
	"id" => "page-view",
	// Another random protection to ensure the credits are included
	// The aim is to make it as annoying as possible to disentangle the credits from the rest of Pepperminty Wiki
	// If you're reading this, you should know that credits are really important - lots of people have put in a huge amount of time and effort to make Pepperminty Wiki what it is today!
	"depends" => [ "page-credits" ],
	"code" => function() {
		/**
		 * @api	{get}	?action=view[&page={pageName}][&revision=rid][&printable=yes][&mode={mode}]	View a page
		 * @apiName			View
		 * @apiGroup		Page
		 * @apiPermission	Anonymous
		 * 
		 * @apiUse PageParameter
		 * @apiParam	{number}	revision	The revision number to display.
		 * @apiParam	{string}	mode		Optional. The display mode to use. Can hold the following values: 'normal' - The default. Sends a normal page. 'printable' - Sends a printable version of the page. 'contentonly' - Sends only the content of the page, not the extra stuff around it. 'parsedsourceonly' - Sends only the raw rendered source of the page, as it appears just after it has come out of the page parser. Useful for writing external tools (see also the `raw` action).
		 *
		 * @apiError	NonExistentPageError	The page doesn't exist and editing is disabled in the wiki's settings. If editing isn't disabled, you will be redirected to the edit page instead.
		 * @apiError	NonExistentRevisionError	The specified revision was not found.
		 */
		
		/*
		 * ██    ██ ██ ███████ ██     ██ 
		 * ██    ██ ██ ██      ██     ██ 
		 * ██    ██ ██ █████   ██  █  ██ 
		 *  ██  ██  ██ ██      ██ ███ ██ 
		 *   ████   ██ ███████  ███ ███  
		 */
		add_action("view", function() {
			global $pageindex, $settings, $env;
			
			// Check to make sure that the page exists
			$page = $env->page;
			if(!isset($pageindex->$page)) {
				// TODO: make this intelligent so we only redirect if the user is actually able to create the page
				if($settings->editing) {
					// Editing is enabled, redirect to the editing page
					$redirectUrl = "index.php?action=edit&newpage=yes&page=".rawurlencode($env->page);
					if(isset($_GET["redirected_from"]))
						$redirectUrl .= "&redirected_from=".rawurlencode($_GET["redirected_from"]);
					http_response_code(307); // Temporary redirect
					header("location: $redirectUrl");
					exit();
				} else {
					// Editing is disabled, show an error message
					http_response_code(404);
					exit(page_renderer::render_main("404: Page not found - $env->page - $settings->sitename", "<p>$env->page_safe does not exist.</p><p>Since editing is currently disabled on this wiki, you may not create this page. If you feel that this page should exist, try contacting this wiki's Administrator (see the bottom of this page for their contact details).</p>"));
				}
			}
			
			header("last-modified: " . gmdate('D, d M Y H:i:s T', $pageindex->{$env->page}->lastmodified));
			
			// Perform a redirect if the requested page is a redirect page
			if(isset($pageindex->$page->redirect) && 
			   $pageindex->$page->redirect === true) // If this is a redirect page.....
			{
				$send_redirect = true;
				if(isset($_GET["redirect"]) && $_GET["redirect"] == "no")
					$send_redirect = false;
				if((isset($pageindex->$page->redirect_absolute) &&
					$pageindex->$page->redirect_absolute == true && // ...and it's absolute....
					$settings->redirect_absolute_enable === false)) // ...and absolute reedirects are enabled
					$send_redirect = false;
			   
				
				if($send_redirect) {
					// TODO: Send an explanatory page along with the redirect
					http_response_code(307);
					$redirectUrl = "?action=$env->action&redirected_from=" . rawurlencode($env->page);
					
					$hashCode = "";
					$newPage = $pageindex->$page->redirect_target;
					if(strpos($newPage, "#") !== false) {
						// Extract the part after the hash symbol
						$hashCode = substr($newPage, strpos($newPage, "#") + 1);
						// Remove the hash from the new page name
						$newPage = substr($newPage, 0, strpos($newPage, "#"));
					}
					$redirectUrl .= "&page=" . rawurlencode($newPage);
					if(!empty($pageindex->$newPage->redirect))
						$redirectUrl .= "&redirect=no";
					if(strlen($hashCode) > 0)
						$redirectUrl .= "#".htmlentities($hashCode);
					
					// Support absolute redirect URLs
					if(isset($pageindex->$page->redirect_absolute) && $pageindex->$page->redirect_absolute === true)
						$redirectUrl = $pageindex->$page->redirect_target;
					
					header("location: $redirectUrl");
					exit();
				}
			}
			
			$title = "$env->page - $settings->sitename";
			if(isset($pageindex->$page->protect) && $pageindex->$page->protect === true)
				$title = $settings->protectedpagechar . $title;
			$content = "";
			if(!$env->is_history_revision)
				$content .= "<h1>$env->page</h1>\n";
			else {
				$content .= "<h1>Revision #{$env->history->revision_number} of $env->page_safe</h1>\n";
				$content .= "<p class='system-text-insert revision-note'><em>(Revision saved by ".htmlentities($env->history->revision_data->editor)." " . render_timestamp($env->history->revision_data->timestamp) . ". <a href='?page=" . rawurlencode($env->page) . "'>Jump to the current revision</a> or see a <a href='?action=history&page=" . rawurlencode($env->page) . "'>list of all revisions</a> for this page.)</em></p>\n";
			}
			
			// Add a visit parent page link if we're a subpage
			if(get_page_parent($env->page) !== false)
				$content .= "<p class='system-text-insert link-parent-page'><em><a href='?action=view&page=" . rawurlencode(get_page_parent($env->page)) . "'>&laquo; " . htmlentities(get_page_parent($env->page)) . "</a></em></p>\n";
			
			// Add an extra message if the requester was redirected from another page
			if(isset($_GET["redirected_from"]))
				$content .= "<p class='system-text-insert'><em>Redirected from <a href='?page=" . rawurlencode($_GET["redirected_from"]) . "&redirect=no'>" . htmlentities($_GET["redirected_from"]) . "</a>.</em></p>\n";
			
			$parsing_start = microtime(true);
			
			$rawRenderedSource = parse_page_source(file_get_contents($env->page_filename));
			$content .= $rawRenderedSource;
			
			if(!empty($pageindex->$page->tags)) {
				$content .= "<ul class='page-tags-display'>\n";
				foreach($pageindex->$page->tags as $tag)
					$content .= "<li><a href='?action=list-tags&tag=" . rawurlencode($tag) . "'>".htmlentities($tag)."</a></li>\n";
				$content .= "\n</ul>\n";
			}
			/*else
			{
				$content .= "<aside class='page-tags-display'><small><em>(No tags yet! Add some by <a href='?action=edit&page=" . rawurlencode($env->page) .  "'>editing this page</a>!)</em></small></aside>\n";
			}*/
			
			if($settings->show_subpages) {
				$subpages = get_object_vars(get_subpages($pageindex, $env->page));
				
				if(count($subpages) > 0) {
					$content .= "<hr />";
					$content .= "Subpages: ";
					foreach($subpages as $subpage => $times_removed) {
						if($times_removed <= $settings->subpages_display_depth) {
							$content .= "<a href='?action=view&page=" . rawurlencode($subpage) . "'>".htmlentities($subpage)."</a>, ";
						}
					}
					// Remove the last comma from the content
					$content = substr($content, 0, -2);
				}
			}
			
			$content .= "\n\t\t<!-- Took " . round((microtime(true) - $parsing_start) * 1000, 2) . "ms to parse page source -->\n";
			
			// Prevent indexing of this page if it's still within the noindex
			// time period
			if(isset($settings->delayed_indexing_time) and
				time() - $pageindex->{$env->page}->lastmodified < $settings->delayed_indexing_time)
				header("x-robots-tag: noindex");
			
			$settings->footer_message = "$env->page_safe was last edited by {$pageindex->{$env->page}->lasteditor} at " . date('h:ia T \o\n j F Y', $pageindex->{$env->page}->lastmodified) . ".</p>\n<p>" . $settings->footer_message; // Add the last edited time to the footer
			
			$mode = isset($_GET["mode"]) ? strtolower(trim($_GET["mode"])) : "normal";
			switch($mode) {
				case "contentonly":
					// Content only mode: Send only the content of the page
					exit($content);
				case "parsedsourceonly":
					// Parsed source only mode: Send only the raw rendered source
					exit($rawRenderedSource);
				case "printable":
					// Printable mode: Sends a printable version of the page
					exit(page_renderer::render_minimal($title, $content));
				case "normal":
				default:
					// Normal mode: Send a normal page
					exit(page_renderer::render_main($title, $content));
			}
		});
	}
]);

?>