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Direct Youtube Description External Links

Provides direct links for external URLs posted in Youtube video descriptions.

  1. // ==UserScript==
  2. // @name         Direct Youtube Description External Links 
  3. // @version      0.1
  4. // @description  Provides direct links for external URLs posted in Youtube video descriptions.
  5. // @include      /^https?\:\/\/(www|encrypted)\.youtube\./
  6. // @author       re11ding
  7. // @license      GPL version 2 or any later version; http://www.gnu.org/licenses/gpl-2.0.txt
  8. // @grant        GM_addStyle
  9. // @run-at       document-start
  10. // @credit       zanetu and his Direct Google Images script as a useful baseline guide
  11. // @noframes
  12. // @namespace https://greasyfork.org/users/393964
  13. // ==/UserScript==
  14.  
  15. //do not run in frames or iframes
  16. if(window.top == window.self) {
  17. 	var RE = /redirect.+?(http.+?)(\&|$)/i;
  18.  
  19. 	function dd(url) {
  20. 		var d1 = decodeURIComponent(url), d2;
  21. 		try {
  22. 			d2 = decodeURIComponent(d1);
  23. 		}
  24. 		catch(malformed) {
  25. 			return d1;
  26. 		}
  27. 		return d2;
  28. 	}
  29.  
  30. 	function closest(element, matchFunction, maxLevel) {
  31. 		var max = undefined === maxLevel ? Number.POSITIVE_INFINITY : parseInt(maxLevel) + 1;
  32. 		if(max > 0 && 'function' === typeof matchFunction) {
  33. 			for(; element && max--; element = element.parentNode) {
  34. 				if(matchFunction(element)) {
  35. 					return element;
  36. 				}
  37. 			}
  38. 		}
  39. 		return null;
  40. 	}
  41.  
  42. 	function handleChange() {
  43. 		var a = document.getElementsByTagName('a');
  44. 		for(var i = a.length - 1; i >= 0; i--) {
  45. 			modifyYoutubeLink(a[i]);
  46. 		}
  47. 		a = [];
  48. 	}
  49.  
  50. 	function modifyYoutubeLink(element) {
  51. 		if(element && element.href) {
  52. 			var m = element.href.match(RE);
  53. 			if(m && m[1]) {
  54. 				element.href = dd(m[1]);
  55. 			}
  56. 		}
  57. 	}
  58.  
  59. 	function monitor() {
  60. 		MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
  61. 		if(MutationObserver) {
  62. 			var observer = new MutationObserver(handleChange);
  63. 			observer.observe(document.documentElement, {childList: true, subtree: true});
  64. 		}
  65. 		//for chrome v18-, firefox v14-, internet explorer v11-, opera v15- and safari v6-
  66. 		else {
  67. 			setInterval(handleChange, 500);
  68. 		}
  69. 		handleChange();
  70. 	}
  71. 	//in case user clicks too early
  72. 	var m = location.href.match(RE);
  73. 	if(m && m[1]) {
  74. 		location.replace(dd(m[1]));
  75. 	}
  76.  
  77. 	//"@run-at document-start" is not fully supported
  78. 	if('interactive' == document.readyState || 'complete' == document.readyState) {
  79. 		monitor();
  80. 	}
  81. 	else {
  82. 		document.addEventListener('DOMContentLoaded', monitor, false);
  83. 	}
  84. }