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