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<?php
namespace Shaarli\Http;
/**
* URL representation and cleanup utilities
*
* Form
* scheme://[username:password@]host[:port][/path][?query][#fragment]
*
* Examples
* http://username:password@hostname:9090/path?arg1=value1&arg2=value2#anchor
* https://host.name.tld
* https://h2.g2/faq/?vendor=hitchhiker&item=guide&dest=galaxy#answer
*
* @see http://www.faqs.org/rfcs/rfc3986.html
*/
class Url
{
private static $annoyingQueryParams = [
// Facebook
'action_object_map=',
'action_ref_map=',
'action_type_map=',
'fb_',
'fb=',
'PHPSESSID=',
// Scoop.it
'__scoop',
// Google Analytics & FeedProxy
'utm_',
// ATInternet
'xtor=',
// Other
'campaign_'
];
private static $annoyingFragments = [
// ATInternet
'xtor=RSS-',
// Misc.
'tk.rss_all'
];
/*
* URL parts represented as an array
*
* @see http://php.net/parse_url
*/
protected $parts;
/**
* Parses a string containing a URL
*
* @param string $url a string containing a URL
*/
public function __construct($url)
{
$url = self::cleanupUnparsedUrl(trim($url));
$this->parts = parse_url($url);
if (!empty($url) && empty($this->parts['scheme'])) {
$this->parts['scheme'] = 'http';
}
}
/**
* Clean up URL before it's parsed.
* ie. handle urlencode, url prefixes, etc.
*
* @param string $url URL to clean.
*
* @return string cleaned URL.
*/
protected static function cleanupUnparsedUrl($url)
{
return self::removeFirefoxAboutReader($url);
}
/**
* Remove Firefox Reader prefix if it's present.
*
* @param string $input url
*
* @return string cleaned url
*/
protected static function removeFirefoxAboutReader($input)
{
$firefoxPrefix = 'about://reader?url=';
if (startsWith($input, $firefoxPrefix)) {
return urldecode(ltrim($input, $firefoxPrefix));
}
return $input;
}
/**
* Returns a string representation of this URL
*/
public function toString()
{
return unparse_url($this->parts);
}
/**
* Removes undesired query parameters
*/
protected function cleanupQuery()
{
if (!isset($this->parts['query'])) {
return;
}
$queryParams = explode('&', $this->parts['query']);
foreach (self::$annoyingQueryParams as $annoying) {
foreach ($queryParams as $param) {
if (startsWith($param, $annoying)) {
$queryParams = array_diff($queryParams, [$param]);
continue;
}
}
}
if (count($queryParams) == 0) {
unset($this->parts['query']);
return;
}
$this->parts['query'] = implode('&', $queryParams);
}
/**
* Removes undesired fragments
*/
protected function cleanupFragment()
{
if (!isset($this->parts['fragment'])) {
return;
}
foreach (self::$annoyingFragments as $annoying) {
if (startsWith($this->parts['fragment'], $annoying)) {
unset($this->parts['fragment']);
break;
}
}
}
/**
* Removes undesired query parameters and fragments
*
* @return string the string representation of this URL after cleanup
*/
public function cleanup()
{
$this->cleanupQuery();
$this->cleanupFragment();
return $this->toString();
}
/**
* Converts an URL with an International Domain Name host to a ASCII one.
* This requires PHP-intl. If it's not available, just returns this->cleanup().
*
* @return string converted cleaned up URL.
*/
public function idnToAscii()
{
$out = $this->cleanup();
if (!function_exists('idn_to_ascii') || !isset($this->parts['host'])) {
return $out;
}
$asciiHost = idn_to_ascii($this->parts['host'], 0, INTL_IDNA_VARIANT_UTS46);
return str_replace($this->parts['host'], $asciiHost, $out);
}
/**
* Get URL scheme.
*
* @return string the URL scheme or false if none is provided.
*/
public function getScheme()
{
if (!isset($this->parts['scheme'])) {
return false;
}
return $this->parts['scheme'];
}
/**
* Get URL host.
*
* @return string the URL host or false if none is provided.
*/
public function getHost()
{
if (empty($this->parts['host'])) {
return false;
}
return $this->parts['host'];
}
/**
* Test if the UrlUtils is an HTTP one.
*
* @return true is HTTP, false otherwise.
*/
public function isHttp()
{
return strpos(strtolower($this->parts['scheme']), 'http') !== false;
}
}
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