Multisite.module

<?php

/**
 *
 * Multisite module for Processwire
 * (C) 2012 Antti Peisa, Avoine Oy
 *
 * ProcessWire 2.x
 * Copyright (C) 2010 by Ryan Cramer
 * Licensed under GNU/GPL v2, see LICENSE.TXT
 *
 * http://www.processwire.com
 * http://www.ryancramer.com
 *
 */

class Multisite extends WireData implements Module, ConfigurableModule {

	public static function getModuleInfo() {

		return array(
			'title' => 'Multisite',
			'version' => 001,
			'summary' => 'Allows multiple sites with different domains run from single PW-site and database.',
			'singular' => true,
			'autoload' => true,
			);
	}

	public function init() {

		$this->subdomainsArray = explode("\n", strtolower($this->subdomains));
		$this->it = (isset($_GET['it'])) ? ltrim($_GET['it'], '/') : '';

		foreach($this->subdomainsArray as $subdomain) {
			$subdomain = trim($subdomain);
			$config = wire('config');
			$httpHost = strtolower(wire('config')->httpHost);

			if(strpos($httpHost, $subdomain) !== false) {

				$this->subdomain = $subdomain;

				// change path like /about/contact/ to /campaign.com/about/contact/
				$_GET['it'] = (isset($_GET['it'])) ? "/{$subdomain}/" . ltrim($_GET['it'], '/') : "/{$subdomain}/";

				// hook for path method to make path() and url() methods context aware
				$this->addHookAfter('Page::path', $this, 'modifyPath');

				break;
			}
		}
	}

	public function ready() {
		// if $this->subdomain was valid in init(), then no need to do more here.
		if($this->subdomain) return;

		$this->subdomain = $this->page->rootParent->name;

		// if rootParent->name isn't a subdomain, then no need to continue
		if(!in_array($this->subdomain, $this->subdomainsArray)) return;

		// if subdomain is visible on url, we might wanna redirect
		if(strpos($this->it, $this->subdomain) === 0 && !$this->page->editable()) {
			$http = ($this->config->https) ? "https://" : "http://";
			$url = $http . $this->subdomain;
			$url .= str_replace("/{$this->subdomain}/", '/', $this->page->url);
			$this->session->redirect($url);
		}
	}

	public function modifyPath($event) {
		$event->return = str_replace("{$this->subdomain}/", '', $event->return);
	}

	static public function getModuleConfigInputfields(array $data) {

		$fields = new InputfieldWrapper();
		$modules = wire('modules');

		$field = $modules->get("InputfieldTextarea");
		$field->name = "subdomains";
		$field->label = "Other sites running from same install";
		$field->description = "Add each domain for their own line. Don't add http or https, just simple domain like: www.example.com tai campaign.example.com";
		$field->notes = "IMPORTANT: create homepage for each of these domains right on the root. Name should be exactly same as the domain you use here.";
		$field->attr('value', $data['subdomains']);
		$fields->add($field);

		return $fields;
	}
}