gnu-social/lib/urlmapper.php

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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2011, StatusNet, Inc.
*
* URL mapper
*
* PHP version 5
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Cache
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2011 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
// This check helps protect against security problems;
// your code file can't be executed directly from the web.
exit(1);
}
/**
* URL mapper
*
* Converts a path into a set of parameters, and vice versa
*
* We used to use Net_URL_Mapper, so there's a wrapper class at Router, q.v.
*
* NUM's vagaries are the main reason we have weirdnesses here.
*
* @category URL
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2011 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class URLMapper
{
const ACTION = 'action';
protected $statics = array();
protected $variables = array();
protected $reverse = array();
function connect($path, $args, $paramPatterns=array())
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{
if (!array_key_exists(self::ACTION, $args)) {
throw new Exception(sprintf("Can't connect %s; path has no action.", $path));
}
$action = $args[self::ACTION];
$paramNames = $this->getParamNames($path);
if (empty($paramNames)) {
$this->statics[$path] = $args;
if (array_key_exists($action, $this->reverse)) {
$this->reverse[$args[self::ACTION]][] = array($args, $path);
} else {
$this->reverse[$args[self::ACTION]] = array(array($args, $path));
}
} else {
// Eff if I understand why some go here and some go there.
// Anyways, fixup my preconceptions
foreach ($paramNames as $name) {
if (!array_key_exists($name, $paramPatterns) &&
array_key_exists($name, $args)) {
$paramPatterns[$name] = $args[$name];
unset($args[$name]);
}
}
$regex = $this->makeRegex($path, $paramPatterns);
$this->variables[] = array($args, $regex, $paramNames);
$format = $this->makeFormat($path, $paramPatterns);
if (array_key_exists($action, $this->reverse)) {
$this->reverse[$args[self::ACTION]][] = array($args, $format, $paramNames);
} else {
$this->reverse[$args[self::ACTION]] = array(array($args, $format, $paramNames));
}
}
}
function match($path)
{
if (array_key_exists($path, $this->statics)) {
return $this->statics[$path];
}
foreach ($this->variables as $pattern) {
list($args, $regex, $paramNames) = $pattern;
if (preg_match($regex, $path, $match)) {
$results = $args;
foreach ($paramNames as $name) {
$results[$name] = $match[$name];
}
return $results;
}
}
throw new Exception(sprintf('No match for path "%s"', $path));
}
function generate($args, $qstring, $fragment)
{
if (!array_key_exists(self::ACTION, $args)) {
throw new Exception("Every path needs an action.");
}
$action = $args[self::ACTION];
if (!array_key_exists($action, $this->reverse)) {
throw new Exception(sprintf('No candidate paths for action "%s"', $action));
}
$candidates = $this->reverse[$action];
foreach ($candidates as $candidate) {
if (count($candidate) == 2) { // static
list($tryArgs, $tryPath) = $candidate;
foreach ($tryArgs as $key => $value) {
if (!array_key_exists($key, $args) || $args[$key] != $value) {
// next candidate
continue 2;
}
}
// success
$path = $tryPath;
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} else {
list($tryArgs, $format, $paramNames) = $candidate;
foreach ($tryArgs as $key => $value) {
if (!array_key_exists($key, $args) || $args[$key] != $value) {
// next candidate
continue 2;
}
}
// success
$toFormat = array();
foreach ($paramNames as $name) {
if (!array_key_exists($name, $args)) {
// next candidate
continue 2;
}
$toFormat[] = $args[$name];
}
$path = vsprintf($format, $toFormat);
}
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if (!empty($qstring)) {
$formatted = http_build_query($qstring);
$path .= '?' . $formatted;
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}
return $path;
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}
// failure; some reporting twiddles
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unset($args['action']);
if (empty($args)) {
throw new Exception(sprintf('No matches for action "%s"', $action));
}
$argstring = '';
foreach ($args as $key => $value) {
$argstring .= "$key=$value ";
}
throw new Exception(sprintf('No matches for action "%s" with arguments "%s"', $action, $argstring));
}
protected function getParamNames($path)
{
preg_match_all('/:(?P<name>\w+)/', $path, $match);
return $match['name'];
}
protected function makeRegex($path, $paramPatterns)
{
$pr = new PatternReplacer($paramPatterns);
$regex = preg_replace_callback('/:(\w+)/',
array($pr, 'toPattern'),
$path);
$regex = '#' . str_replace('#', '\#', $regex) . '#';
return $regex;
}
protected function makeFormat($path, $paramPatterns)
{
$format = preg_replace('/(:\w+)/', '%s', $path);
return $format;
}
}
class PatternReplacer
{
private $patterns;
function __construct($patterns)
{
$this->patterns = $patterns;
}
function toPattern($matches)
{
// trim out the :
$name = $matches[1];
if (array_key_exists($name, $this->patterns)) {
$pattern = $this->patterns[$name];
} else {
// ???
$pattern = '\w+';
}
return '(?P<'.$name.'>'.$pattern.')';
}
}