<?php
/*
 * Plugin Name: PrettyURLs
 * Version: 3.0
 * Plugin URI: https://www.flatpress.org
 * Author: FlatPress
 * Author URI: https://www.flatpress.org
 * Description: Enables SEO friendly, pretty URLs (via htaccess). Part of the standard distribution.
 */

/**
 * Place where the index is stored
 */
define('PRETTYURLS_TITLES', true);
define('PRETTYURLS_PATHINFO', !file_exists(ABS_PATH . '.htaccess'));
define('PRETTYURLS_CACHE', CACHE_DIR . '%%prettyurls-index.tmp');
define('PRETTYURLS_CATS', CACHE_DIR . '%%prettyurls-cats.tmp');

/**
 * File existance check
 */

// memo
// register_plugin_setup('plugin_id', 'setup_func');
function plugin_prettyurls_setup() {
	if (file_exists(ABS_PATH . '.htaccess'))
		return 1;

	if (!is_writable(ABS_PATH)) {
		return -2;
	}

	return 1;
}

class Plugin_PrettyURLs {

	var $index = array();

	var $status = 0;

	var $date_handled = false;

	var $categories = null;

	var $fp_params;

	function categories($force = true) {
		if ($this->categories)
			return;

		if ($force || !file_exists(PRETTYURLS_CATS)) {
			$d = entry_categories_get('defs');
			$list = array();
			foreach ($d as $k => $v) {
				$list [$k] = sanitize_title($v);
			}
			io_write_file(PRETTYURLS_CATS, serialize($list));
		} else {
			$f = io_load_file(PRETTYURLS_CATS);
			$list = unserialize($f);
		}
		$this->categories = $list;
	}

	function md5($id, $title) {
		$date = date_from_id($id);
		return md5($date ['y'] . $date ['m'] . $date ['d'] . $title);
	}

	function permalink($str, $id) {
		global $fpdb, $post;

		if (isset($post) && PRETTYURLS_TITLES)
			$title = sanitize_title($post ['subject']);
		else
			$title = $id;
		$date = date_from_id($id);
		// yeah, hackish, I know...

		return $this->baseurl . "20{$date['y']}/{$date['m']}/{$date['d']}/$title/";
	}

	function commentlink($str, $id) {
		$link = $this->permalink($str, $id);
		return $link . "comments/";
	}

	function feedlink($str, $type) {
		return $this->baseurl . "feed/{$type}/";
	}

	function commentsfeedlink($str, $type, $id) {
		$link = $this->commentlink($str, $id);
		return $link . "feed/{$type}/";
	}

	function staticlink($str, $id) {
		return $this->baseurl . "$id/";
	}

	function categorylink($str, $catid) {
		if (PRETTYURLS_TITLES) {
			if (@$this->categories [$catid])
				return $this->baseurl . "category/{$this->categories[$catid]}/";
			else
				return $str;
		} else {
			return $this->baseurl . "category/{$catid}/";
		}
	}

	function yearlink($str, $y) {
		return $this->baseurl . "20$y/";
	}

	function monthlink($str, $y, $m) {
		return $this->yearlink($str, $y) . "$m/";
	}

	function daylink($str, $y, $m, $d) {
		return $this->monthlink($str, $y, $m) . "$d/";
	}

	function cache_create() {
		$this->index = array();

		/*
		 * $o =& entry_init();
		 *
		 * $entries = $o->getList();
		 */

		$o = new FPDB_Query(array(
			'start' => 0,
			'count' => -1,
			'fullparse' => false
		), null);

		// foreach ($entries as $id => $contents) {
		while ($o->hasMore()) {
			list ($id, $contents) = $o->getEntry();
			$date = date_from_id($id);
			echo $contents ['subject'], "\n";
			$md5 = md5(sanitize_title($contents ['subject']));
			$this->index [$date ['y']] [$date ['m']] [$date ['d']] [$md5] = $id;
		}
		// }

		$this->cache_save();
		io_write_file(PRETTYURLS_CACHE, 'dummy');
	}

	function handle_categories($matches) {
		if (!$this->categories)
			return;

		if (PRETTYURLS_TITLES) {
			if ($c = array_search($matches [1], $this->categories))
				$this->fp_params ['cat'] = $c;
			else
				return $matches [0];
		} else {
			$this->fp_params ['cat'] = $matches [1];
		}
	}

	/*
	 * named matches are not supported here
	 */
	function handle_date($matches) {
		$this->fp_params ['y'] = $matches [1];
		if (isset($matches [3]))
			$this->fp_params ['m'] = $matches [3];
		if (isset($matches [5]))
			$this->fp_params ['d'] = $matches [5];

		$this->date_handled = true;
	}

	function handle_static($matches) {
		$this->fp_params ['page'] = $matches [1];
		$this->status = 2;
	}

	function handle_entry($matches) {
		if (!PRETTYURLS_TITLES) {
			$this->fp_params ['entry'] = $matches [1];
			return;
		}

		// data is not as expected
		if (!array_key_exists('y', $this->fp_params) || !array_key_exists('m', $this->fp_params) || !array_key_exists('d', $this->fp_params)) {
			// a bit hackish: we make up a fake url when there is no match,
			// so that at the higher level the system will 404...
			$this->fp_params ['entry'] = 'a';
		}

		if ($this->cache_get($this->fp_params ['y'], $this->fp_params ['m'], $this->fp_params ['d'], md5($matches [1]))) {
			$this->fp_params ['entry'] = $this->index [$this->fp_params ['y']] [$this->fp_params ['m']] [$this->fp_params ['d']] [md5($matches [1])];
		} else {
			// a bit hackish: we make up a fake url when there is no match,
			// so that at the higher level the system will 404...
			$this->fp_params ['entry'] = 'a';
		}
	}

	function handle_page($matches) {
		$this->fp_params ['paged'] = $matches [1];
		$this->status = 2;
	}

	function handle_comment($matches) {
		$this->fp_params ['comments'] = true;
	}

	function handle_feed($matches) {
		$this->fp_params ['feed'] = isset($matches [2]) ? $matches [2] : 'rss2';
	}

	function get_url() {
		$baseurl = BLOG_BASEURL;
		$opt = plugin_getoptions('prettyurls', 'mode');
		$url = substr($_SERVER ['REQUEST_URI'], strlen(BLOG_ROOT) - 1);

		$urllenght = strlen($url);

		if (isset($_SERVER ['PATH_INFO'])) {
			$pathinfo = $_SERVER ['PATH_INFO'];
		} else {
			$pathinfo = '';
		}

		switch ($opt) {
			case null:
			case 0:
				$opt = file_exists(ABS_PATH . '.htaccess') ? 3 : 1;
			case 1:
				$baseurl .= 'index.php/';
				if ($urllenght < 2) {
					$url = "/";
				} else {
					// $url = $_SERVER['PATH_INFO'];
					$url = $pathinfo;
				}
				break;
			case 2:
				$baseurl .= '?u=/';
				$url = @$_GET ['u'];
			/* case 3: do nothing, it's BLOG_BASEURL */
		}

		$this->baseurl = $baseurl;
		$this->mode = $opt;

		return $url;
	}

	/*
	 * here is where the real work is done.
	 *
	 * First we load the cache if exists;
	 *
	 * We check then if the GET request contains a 'title'
	 * if so, we'll need date and time to construct the md5 sum
	 * with which we index the cache array
	 *
	 * If that entry exists, we set $_GET['entry'] to that ID,
	 * so that FlatPress can find it where it is expected
	 *
	 */
	function cache_init() {
		global $fp_params;

		$this->fp_params = &$fp_params;
		$url = $this->get_url();

		if (PRETTYURLS_TITLES) {
			// if ($f = io_load_file(PRETTYURLS_CACHE))
			$this->index = array(); // unserialize($f);

			if (!file_exists(PRETTYURLS_CACHE))
				$this->cache_create();

			$this->categories(false);
		}

		if (!defined('MOD_INDEX'))
			return;

		// # this is not working if you reach flatpress via symlink
		// # unless you don't edit manually defaults.php
		// if (strpos($_SERVER['REQUEST_URI'], BLOG_ROOT)!==false) {
		// $url = $_SERVER['REQUEST_URI'];
		// $del = BLOG_ROOT;
		// if (strpos($url, 'index.php')!==false)
		// $del = $del . 'index.php/';
		// $url = substr($url, strlen($del)-1);
		// }

		// removes querystrings
		if (false !== $i = strpos($url, '?'))
			$url = substr($url, 0, $i);

		// removes anchors
		if (false !== $i = strpos($url, '#'))
			$url = substr($url, 0, $i);

		if (strrpos($url, '/') != (strlen($url) - 1)) {
			$url .= '/';
		}

		if ($url == '/')
			return;

		// date
		$url = preg_replace_callback('!^/[0-9]{2}(?P<y>[0-9]{2})(/(?P<m>[0-9]{2})(/(?P<d>[0-9]{2}))?)?!', array(
			&$this,
			'handle_date'
		), $url);

		if (!$this->date_handled) {
			// static page
			$url = preg_replace_callback('|^/([a-zA-Z0-9_-]+)/$|', array(
				&$this,
				'handle_static'
			), $url);
			if ($this->status == 2)
				return $this->check_url($url);
		}

		$url = preg_replace_callback('{category/([^/]+)/}', array(
			&$this,
			'handle_categories'
		), $url);

		$url = preg_replace_callback('|page/([0-9]+)/$|', array(
			&$this,
			'handle_page'
		), $url);
		if ($this->status == 2)
			return $this->check_url($url);

		if ($this->date_handled) {
			$url = preg_replace_callback('|^/([^/]+)|', array(
				&$this,
				'handle_entry'
			), $url);
			// if status = 2
			/*
			 * utils_error(404);
			 */

			$url = preg_replace_callback('|^/comments|', array(
				&$this,
				'handle_comment'
			), $url);
		}

		$url = preg_replace_callback('|^/feed(/([^/]*))?|', array(
			&$this,
			'handle_feed'
		), $url);

		$this->check_url($url);
	}

	function check_url($url) {
		if (!empty($url) && $url != '/') {
			$this->fp_params = array(
				'entry' => 'entry000000-000000'
			);
			$url = apply_filters('prettyurls_unhandled_url', $url);
		}
	}

	function cache_delete_elem($id, $date) {

		// is this a title change?
		if (false !== ($ids = $this->cache_get($date ['y'], $date ['m'], $date ['d'])))
			$hash = array_search($id, $ids);
		else
			return;

		if ($hash) {
			unset($this->index [$date ['y']] [$date ['m']] [$date ['d']] [$hash]);

			if (empty($this->index [$date ['y']] [$date ['m']] [$date ['d']])) {
				unset($this->index [$date ['y']] [$date ['m']] [$date ['d']]);

				if (empty($this->index [$date ['y']] [$date ['m']])) {
					unset($this->index [$date ['y']] [$date ['m']]);

					if (empty($this->index [$date ['y']])) {
						unset($this->index [$date ['y']]);
					}
				}
			}
		}

		$this->cache_save();
	}

	function cache_add($id, $arr) {
		$date = date_from_id($id);
		$title = sanitize_title($arr ['subject']);

		$this->cache_delete_elem($id, $date);

		if ($this->index [$date ['y']] [$date ['m']] === false) {
			$this->index [$date ['y']] [$date ['m']] = array();
		}

		$this->index [$date ['y']] [$date ['m']] [$date ['d']] [md5($title)] = $id;

		$this->cache_save();

		return true;
	}

	function cache_get($y, $m, $d = null, $h = null) {
		if (!isset($this->index [$y] [$m])) {
			$s = @io_load_file(PRETTYURLS_CACHE . $y . $m);
			$this->index [$y] [$m] = $s ? unserialize($s) : false;
		}

		if (is_null($d))
			return $this->index [$y] [$m];

		if (is_null($h))
			return isset($this->index [$y] [$m] [$d]) ? $this->index [$y] [$m] [$d] : false;

		if (isset($this->index [$y] [$m] [$d]))
			return isset($this->index [$y] [$m] [$d] [$h]);
		else
			return false;
	}

	function cache_delete($id) {
		$date = date_from_id($id);
		$this->cache_delete_elem($id, $date);
		$this->cache_save();
	}

	function cache_save() {
		if ($this->index) {
			foreach ($this->index as $year => $months) {
				foreach ($months as $month => $days)
					io_write_file(PRETTYURLS_CACHE . $year . $month, serialize($days));
			}
		}

		return true;
	}

	function nextprevlink($nextprev, $v) {
		global $fpdb;
		$q = &$fpdb->getQuery();

		list ($caption, $id) = call_user_func(array(
			&$q,
			'get' . $nextprev
		));

		if (!$id)
			return array();

		if ($q->single) {
			$date = date_from_id($id);
			if (PRETTYURLS_TITLES)
				$title = sanitize_title($caption);
			else
				$title = $id;
			$url = $this->baseurl . "20{$date['y']}/{$date['m']}/{$date['d']}/$title/";

			if ($v > 0)
				$caption = $caption . ' &raquo; ';
			else
				$caption = ' &laquo; ' . $caption;

			return array(
				$caption,
				$url
			);
		}

		// else, we build a complete url

		/* todo: clean up this mess... which means cleaning up the mess above. oh, my! */

		$l = $this->baseurl;

		if ((is_numeric($cid = @$this->fp_params ['category'])) || is_numeric($cid = @$this->fp_params ['cat']))
			$l = $this->categorylink($l, $cid);

		if (isset($this->fp_params ['y']) && $this->fp_params ['y']) {
			$l .= '20' . $this->fp_params ['y'] . '/';

			if (isset($this->fp_params ['m']) && $this->fp_params ['m']) {
				$l .= $this->fp_params ['m'] . '/';

				if (isset($this->fp_params ['d']) && $this->fp_params ['d'])
					$l .= $this->fp_params ['d'] . '/';
			}
		}

		$page = 1;

		if (isset($this->fp_params ['paged']) && $this->fp_params ['paged'] > 1)
			$page = $this->fp_params ['paged'];

		$page += ($v . '');

		if ($page > 0) {
			$l .= 'page/' . $page . '/';
		}

		return array(
			$caption,
			$l
		);
	}

}

global $plugin_prettyurls;
$plugin_prettyurls = new Plugin_PrettyURLs();
$plugin_prettyurls->categories();

if (!defined('MOD_ADMIN_PANEL')) {

	if (!function_exists('get_nextpage_link')) :

		function get_nextpage_link() {
			global $plugin_prettyurls;
			return $plugin_prettyurls->nextprevlink('NextPage', 1);
		}

		function get_prevpage_link() {
			global $plugin_prettyurls;
			return $plugin_prettyurls->nextprevlink('PrevPage', -1);
		}
		
		endif;

}

add_filter('post_link', array(
	&$plugin_prettyurls,
	'permalink'
), 0, 2);
add_filter('comments_link', array(
	&$plugin_prettyurls,
	'commentlink'
), 0, 2);
add_filter('feed_link', array(
	&$plugin_prettyurls,
	'feedlink'
), 0, 2);
add_filter('post_comments_feed_link', array(
	&$plugin_prettyurls,
	'commentsfeedlink'
), 0, 3);
add_filter('category_link', array(
	&$plugin_prettyurls,
	'categorylink'
), 0, 2);
add_filter('page_link', array(
	&$plugin_prettyurls,
	'staticlink'
), 0, 2);

// date related functions
add_filter('year_link', array(
	&$plugin_prettyurls,
	'yearlink'
), 0, 2);
add_filter('month_link', array(
	&$plugin_prettyurls,
	'monthlink'
), 0, 3);
add_filter('day_link', array(
	&$plugin_prettyurls,
	'daylink'
), 0, 4);

if (PRETTYURLS_TITLES) {
	add_filter('publish_post', array(
		&$plugin_prettyurls,
		'cache_add'
	), 5, 2);
	add_filter('delete_post', array(
		&$plugin_prettyurls,
		'cache_delete'
	));
	add_action('update_categories', array(
		&$plugin_prettyurls,
		'categories'
	));
}

add_filter('init', array(
	&$plugin_prettyurls,
	'cache_init'
));

if (class_exists('AdminPanelAction')) {

	class admin_plugin_prettyurls extends AdminPanelAction {

		var $langres = 'plugin:prettyurls';

		var $_config = array(
			'mode' => 0
		);

		function setup() {
			$this->smarty->assign('admin_resource', "plugin:prettyurls/admin.plugin.prettyurls");
			$this->_config ['mode'] = plugin_getoptions('prettyurls', 'mode');
			$this->smarty->assign('pconfig', $this->_config);
			$blogroot = BLOG_ROOT;
			$f = ABS_PATH . '.htaccess';
			$txt = io_load_file($f);
			if (!$txt) {

				$txt = '
				
				# Thanks again WP :)
				
				<IfModule mod_rewrite.c>
				RewriteEngine On
				RewriteBase ' . $blogroot . '
				RewriteCond %{REQUEST_FILENAME} !-f
				RewriteCond %{REQUEST_FILENAME} !-d
				RewriteRule . ' . $blogroot . 'index.php [L]
				</IfModule>
				';
			}

			$this->smarty->assign('cantsave', (!is_writable(ABS_PATH) || (file_exists($f) && !is_writable($f))));
			$this->smarty->assign('htaccess', $txt);
		}

		function onsubmit($data = null) {
			global $fp_config;

			if (isset($_POST ['saveopt'])) {
				$this->_config ['mode'] = (int) $_POST ['mode'];
				plugin_addoption('prettyurls', 'mode', $this->_config ['mode']);
				if (plugin_saveoptions())
					$this->smarty->assign('success', 2);
				else
					$this->smarty->assign('success', -2);
			}

			if (isset($_POST ['htaccess-submit'])) {
				if (!empty($_POST ['htaccess']) && io_write_file(ABS_PATH . '.htaccess', $_POST ['htaccess'])) {
					$this->smarty->assign('success', 1);
				} else {
					$this->smarty->assign('success', -1);
				}
			}

			return 2;
		}

	}

	admin_addpanelaction('plugin', 'prettyurls', true);
}

?>