<?php
/**
* Parses a URI, provides details and a full correctly composed URI, processes a relative URI redirect
*
* @package gCurl
* @author Grigori Kochanov
* @version 1
*/
class gURI{
/**
* URI schema part
*
* @var string
*/
public $scheme;
/**
* Host name
*
* @var string
*/
public $host;
/**
* User (for basic HTTP authentication)
*
* @var string
*/
public $user;
/**
* Password (for basic HTTP authentication)
*
* @var string
*/
public $pass;
/**
* Path part
*
* @var string
*/
public $path;
/**
* Directory part of the path (not part of RFC)
*
* @var string
*/
public $dir;
/**
* Query string
*
* @var string
*/
public $query;
/**
* Port to connect to (if not 80)
*
* @var string
*/
public $port;
/**
* Port part including preceeding semicolon
*
* @var string
*/
public $port_string;
/**
* The anchor (after #)
*
* @var string
*/
public $fragment;
/**
* Full correct URI in the RFC-compliant format
*
* @var string
*/
public $full;
/**
* Flag defines whether to process "/../", "/./", "//" and convert backslash to slashes
*
* @var bool
*/
public $normalize_path = false;
/**
* Symbol used to mark a start of a query
*
*/
public $QUERY_DELIMITER = '?';
/**
* Class constructor
*
* @param string $new_uri
*/
function __construct($new_uri=null){
$new_uri and $this->process($new_uri);
}
/**
* Parse the URI, return false on error
*
* @param string $new_uri
* @return bool
*/
function process($new_uri){
//init variables, results of parse_url() may redefine them
$this->scheme =$this->host=$this->user =$this->pass =$this->path =$this->dir=$this->query=$this->fragment=$this->full='';
$this->port = 80;
$this->port_string = ':80';
if (strpos($new_uri, '://') === false){
$new_uri = 'http://'.$new_uri;
}
//parse current url - get parts
$uri_array = @parse_url($new_uri);
if (!$uri_array){
return false;
}
//set varables with parts of URI
$uri_array['scheme'] = empty($uri_array['scheme'])?'http://': $uri_array['scheme'].'://';
//user:password@
if (!empty($uri_array['user'])){
if (!empty($uri_array['pass']))
$uri_array['pass'] = ':'.$uri_array['pass'].'@';
else {
$uri_array['user'] .= '@';
$uri_array['pass'] = '';
}
}else {
$uri_array['user'] = $uri_array['pass'] = '';
}
if (!empty($uri_array['port'])){
$uri_array['port_string'] = ':'.$uri_array['port'];
}else {
$uri_array['port'] = 80;
$uri_array['port_string'] = '';
}
if (empty($uri_array['path']) || !trim($uri_array['path'])){
$uri_array['path'] = '/';
}
$uri_array['dir']=$this->dirname($uri_array['path']);
$uri_array['query'] =empty($uri_array['query'])? '':'?'.$uri_array['query'];
$uri_array['fragment'] = empty($uri_array['fragment'])?'': '#'.$uri_array['fragment'];
//assign class fields
foreach($uri_array as $key=>$value){
$this->$key = $value;
}
$this->get_full_uri();
return true;
}
/**
* Processes a new URI using details of a previous one
*
* @param string $new_url
* @return bool
*/
function parse_http_redirect ($new_url){
if (!$new_url || !is_string($new_url)){
return false;
}
//detect if URL is absolute
if ($method_pos = strpos($new_url, '://')){
$method = substr($new_url, 0, $method_pos);
if (!strcasecmp($method, 'http') || !strcasecmp($method,'https')){
// absolute URL passed
return $this->process($new_url);
}else{//invalid protocol
return false;
}
}
// URL is relative
//do we have GET data in the URL?
$param_pos = strpos($new_url, $this->QuERY_DELIMITER);
if($param_pos !== false){
$new_query = substr($new_url, $param_pos);
$new_path = $param_pos ? substr($new_url, 0, $param_pos) : '' ;
}else{
$new_path = $new_url;
$new_query = '';
}
//is URL relative to the previous URL path?
if ($new_url[0] != '/'){
//attach relative link to the current URI's directory
$new_path = $this->dirname($this->path).'/'. $new_path;
}
if ($this->normalize_path){
//replace back and repetitive slashes with a single forward one
$new_path = preg_replace ('~((\\\\+)|/){2,}~', '/', $new_path);
//parse links to the upper directories
if (strpos($new_path, '/../') !== false){
$path_array = explode ('/', $new_path);
foreach ($path_array as $key=>$value){
if ($value == '..'){
if ($key > 2){
unset ($path_array[$key-1]);
}
unset ($path_array[$key]);
}
}
$new_path = implode ('/', $path_array);
}
//parse links to the 'current' directories
$new_path = str_replace('/./', '/', $new_path);
}
$this->path = $new_path;
$this->query = $new_query;
$this->get_full_uri();
return true;
}
/**
* Returns the directory part of the path (path parameter may include query string)
*
* @param string $path
* @return string
*/
function dirname($path){
if(!$path){
return false;
}
$i=strpos($path,'?');
$dir=$i?substr($path,0,$i):$path;
$i=strrpos($dir,'/');
$dir=$i?substr($dir,0,$i):'/';
$dir[0]=='/' || $dir='/'.$dir;
return $dir;
}
/**
* (re)compile the full uri and return the string
*
* @return string
*/
function get_full_uri(){
$this->full = $this->scheme.$this->user.$this->pass.
$this->host.$this->port_string.$this->path.$this->query;
return $this->full;
}
/**
*Checks if the requested host exists
*
*@return bool
*/
function checkHost(){
if (!$this->host){
throw new URLException(120);
}
//host name may be given as IP address or domain name
$regexp='/^\d{2,3}(\.\d{1,3}){3}$/';
if(!checkdnsrr($this->host,'A') && !preg_match($regexp,$this->host)){
throw new URLException(120);
}
}
//end of the class
}
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