-
-/**
- * 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 = array(
- // 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 = array(
- // 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, array($param));
- continue;
- }
- }
- }
-
- if (count($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 $this->parts['host'];
- }
-
- /**
- * Test if the Url is an HTTP one.
- *
- * @return true is HTTP, false otherwise.
- */
- public function isHttp() {
- return strpos(strtolower($this->parts['scheme']), 'http') !== false;
- }
-}