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RSS+Atom Feed Subscribe Button Generator

Finds RSS and/or Atom links on a page and inserts feed subscription links for use by aggregators

当前为 2014-11-04 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @id          RSS+Atom Feed Subscribe Button Generator
  3. // @name        RSS+Atom Feed Subscribe Button Generator
  4. // @description Finds RSS and/or Atom links on a page and inserts feed subscription links for use by aggregators
  5. // @namespace   http://loonyone.livejournal.com
  6. // @include     *
  7. // @creator     Manpreet Singh [junkblocker@yahoo.com]
  8. // @copyright   Manpreet Singh [junkblocker@yahoo.com]
  9. // @author      Manpreet Singh [junkblocker@yahoo.com]
  10. // @version     2.5
  11. // @date        2014-11-04
  12. // ==/UserScript==
  13.  
  14. /*
  15.  * Copyright (c) 2006-2014, Manpreet Singh [junkblocker@yahoo.com]
  16.  *
  17.  * Permission is hereby granted, free of charge, to any person
  18.  * obtaining a copy of this software and associated documentation
  19.  * files (the "Software"), to deal in the Software without
  20.  * restriction, including without limitation the rights to use,
  21.  * copy, modify, merge, publish, distribute, sublicense, and/or sell
  22.  * copies of the Software, and to permit persons to whom the
  23.  * Software is furnished to do so, subject to the following
  24.  * conditions:
  25.  *
  26.  * The above copyright notice and this permission notice shall be
  27.  * included in all copies or substantial portions of the Software.
  28.  *
  29.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30.  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  31.  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32.  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  33.  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  34.  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  35.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  36.  * OTHER DEALINGS IN THE SOFTWARE.
  37.  */
  38.  
  39. // ******
  40. // Opera, Chrome, Chromium, Safari and IE7Pro compatible except
  41. //
  42. // 1) link tags injection does not work in IE7Pro
  43. //
  44. // due to non-firefox platform limitations/differences.
  45. //
  46. // IE7Pro bundles an older version of this script by default.
  47. // ******
  48.  
  49. // Version 2.5 - New home at greasyfork.org
  50. //               Removed auto-update code
  51. // Version 2.4 - Constrained container background and border
  52. // Version 2.3 - Constrained button dimensions some more
  53. // Version 2.2 - Constrained button dimensions
  54. // Version 2.1 - Fixed Content Security Policy issues
  55. // Version 2.0 - 'more' button was broken for me
  56. //               some javascript lint cleanup
  57. //               Lighter icons by simon!
  58. // Version 1.9 - Fixed invalid update metadata
  59. // Version 1.8 - Layout fix on apple.com/macupdate.com etc.
  60. // Version 1.7 - Minor layout fix on arstechnica.com
  61. // Version 1.6 - Insert discovered link tags in header for the browser's detection to list them too
  62. // Version 1.5 - Added license info
  63. //               Added checks for feeds like &feed=rss or &feed=atom and some case insensitivity
  64. // Version 1.4 - Made the feed check slightly more stringent by excluding javascript: mailto: etc. urls
  65. // Version 1.3 - Reduce the number of button shown initially to a sane minimum
  66. // Version 1.2 - Fixed partially broken auto update.
  67. //               Don't increase the install count on userscripts.org while checking for updates
  68. // Version 1.1 - Misc code cleanup
  69. // Version 1.0 - Added auto update without requiring an external script
  70. // Version 0.9 - Added a close button
  71. // Version 0.8 - Checks some wiki feeds with ?action=rss_rc and feeds with /rss/$ or /atom/$
  72. // Version 0.7 - Check for feedburner feeds
  73. // Version 0.6 - Fixed a major issue with using snapshotLength when it was not available
  74. // Version 0.5 - Updated contact info
  75. // Version 0.4 - Added optional auto-update facility
  76. // Version 0.3 - Added some speed optimizations
  77. // Version 0.2 - Merged Iain Brodfoot's floating div behaviour and removed purl.org links
  78. //             - Allow revert to old behaviour by hand editing this script
  79. // Version 0.1 - First release
  80.  
  81. /*
  82.  * Options contribution by Iain Broadfoot (ibroadfo@geeksoc.org)
  83.  * - remove link to purl
  84.  *   (Manually edit this script to restore old behaviour. See TWEAK NOTE 1 below)
  85.  * - Float the buttons to enable better behaviour on blogger/blogspot.com
  86.  *   (Manually edit this script to restore old behaviour. See TWEAK NOTE 2 below)
  87.  *
  88.  * Initially lifted mostly from
  89.  *   Generate RSS and ATOM tags: http://highbyte.bounceme.net/greasemonkey/genrsslinkrel.user.js
  90.  *   Amazon Atom Injector:       http://docs.g-blog.net/code/greasemonkey/amazon_xml_feeds.user.js
  91.  *   Add RSS Index:              http://www.xs4all.nl/~jlpoutre/BoT/Javascript/RSSpanel/rsspanel.user.js
  92.  *
  93.  * Original buttons from the excellent: http://kalsey.com/tools/buttonmaker/
  94.  */
  95.  
  96. (function() {
  97.   function addEventHandler(target, eventName, eventHandler, scope) {
  98.     var f = scope ? function(){ eventHandler.apply( scope, arguments ); } : eventHandler;
  99.     if (target.addEventListener)  {
  100.       target.addEventListener(eventName, f, true);
  101.     } else if (target.attachEvent) {
  102.       target.attachEvent('on' + eventName, f);
  103.     }
  104.     return f;
  105.   }
  106.  
  107.   var head = document.getElementsByTagName('head');
  108.   if (head && head[0]) head = head[0];
  109.   var INITIAL_COUNT = 5;
  110.   var ATOM_ICON  = '<img src="data:image/png;base64,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" style="border: none !important; margin: 0px !important; width: 80px !important; height: 15px !important; display: inline !important;" />';
  111.   var RSS_ICON   = '<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFAAAAAPAgMAAAAOp6AcAAAAAXNSR0IArs4c6QAAAAxQTFRFAAAA/2YAiY55////S8IQBgAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9wLFRMROauDVnkAAAB7SURBVBjTpc8xDoAgDEBRLuXsKToaT0FMungfMLgz4CmMdygzC1G0yGIii/EPDM0LaYWo1Z6vdtFADtWj6ctwhKNfcTE26ehm8nHhodxAApKx3iifX3vL0AM6Y09NxDJlOUAHK2o2ihkVKbcwAiZNaSb25c9/e1Zvr3UBWOasaPHYnJwAAAAASUVORK5CYII=" style="border: none !important; margin: 0px !important; width: 80px !important; height: 15px !important; display: inline !important;" />';
  112.   var RDF_ICON   = '<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFAAAAAPAgMAAAAOp6AcAAAAAXNSR0IArs4c6QAAAAxQTFRFAAAA/2YAiY55////S8IQBgAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9wLFRMKD80PCHoAAAB3SURBVBjTpc8xDsAQGIZhl+rcU4jJMaSJxX1o2A0cwx1+s0Ua+muXJrU0fQfDlycCIbPW/uogCx1J/Wj/MipWFJXR+mZqcJBrxFEkLqgE67PVeZz+khxlsL4bAJRtyI0NadBoZHBLkQqOzUBzgP6+8987p3+fdQKJXassgfh4CAAAAABJRU5ErkJggg==" style="border: none !important; margin: 0px !important; width: 80px !important; height: 15px !important; display: inline !important;" />';
  113.   var XML_ICON   = '<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFAAAAAPAgMAAAAOp6AcAAAAAXNSR0IArs4c6QAAAAxQTFRFAAAA/2YAiY55////S8IQBgAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9wLFRMRFO5cCgwAAAB3SURBVBjTY2DABuz/Y4A/DKahIFC1CgmsIUWwtPTq9dCq/et2/Vv9a9/6V69/7QcKxl79DhR8tW7X63WrXoPIXUDB8NC7QMF963b9X/3qFVDlP4hKkPbVQDWrgMpeQVSCzPxa9W/1q3/rXwHVQ8ykzJ1Y/Y4NAADEZ67GIr3R+wAAAABJRU5ErkJggg==" style="border: none !important; margin: 0px !important; width: 80px !important; height: 15px !important; display: inline !important;" />';
  114.   var CLOSE_ICON = '<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPAgMAAABGuH3ZAAAAAXNSR0IArs4c6QAAAAlQTFRF/2YA////AAAALA0mBgAAAAFiS0dEAIgFHUgAAAAJcEhZcwAAEnMAABJzAYwiuQcAAAAHdElNRQfcCxUTCRv8+I/EAAAAMklEQVQI12NYtWrVCoapoaERDBMYGCSghAMLkBAQABIsDkCCkQHGAouBZeGKwXpBpgAAhtMRBKRIycIAAAAASUVORK5CYII=" style="border: none !important; margin: 0px !important; width: 15px !important; height: 15px !important; display: inline !important;" />';
  115.   var MORE_ICON  = '<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAPAgMAAADrOWVwAAAAAXNSR0IArs4c6QAAAAxQTFRFAAEA/mcAh494/v/8doDPMwAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9wLFRMNODrzO7IAAABNSURBVAjXY2BAAPv/UPCHwTQUDKpWrcHGfAVklpbWxl/9W/ULyKz9ej229GrVPyCzvPQ6SPQ/WMH12KsQUaDa2FKIWiQTsFqB5AYEAABsXUkpSEP5/AAAAABJRU5ErkJggg==" style="border: none !important; margin: 0px !important; width: 40px !important; height: 15px !important; display: inline !important;" />';
  116.   // array to keep track of 'seen' feed links.
  117.   var seen = [];
  118.  
  119.   var fsbdiv = document.createElement("div");
  120.   fsbdiv.setAttribute("id", "XmlButtons");
  121.   fsbdiv.style.textAlign = "left";
  122.   fsbdiv.style.margin = "0px";
  123.   // top right bottom left
  124.   fsbdiv.style.padding = "0px 3px 0px 3px";
  125.   fsbdiv.style.border = "none" ;
  126.   fsbdiv.style.background = "none";
  127.   // TWEAK NOTE 1 START: Comment out the next three lines to disable the buttons from floating
  128.   fsbdiv.style.position = "fixed";
  129.   fsbdiv.style.top = "0px";
  130.   fsbdiv.style.left = "0px";
  131.   fsbdiv.style.zIndex = "99999";
  132.   fsbdiv.style.display = 'inline';
  133.   // TWEAK NOTE 1 END
  134.  
  135.   // Get links already declared properly in <link> elements in <head>
  136.   function getKnownTags() {
  137.     var linkRelElems = document.getElementsByTagName("link");
  138.     var tlink;
  139.  
  140.     for (var i = 0, l = linkRelElems.length; i < l; i++) {
  141.       tlink = linkRelElems[i];
  142.       if (!tlink) continue;
  143.       try {
  144.         var thref = tlink.href;
  145.         var type = tlink.type;
  146.  
  147.         if (type && type.match(/.*\/rs[sd](\+xml)?$/i)) {
  148.           addRssLinkTag(thref, RSS_ICON);
  149.         } else if (type && type.match(/.*\/atom\+xml$/i)) {
  150.           addRssLinkTag(thref, ATOM_ICON);
  151.         } else if (type && type.match(/^text\/xml$/i)) {
  152.           addRssLinkTag(thref, RSS_ICON);
  153.         }
  154.       } catch (e) {
  155.       }
  156.     }
  157.   }
  158.  
  159.   function discoverUnknownFeeds() {
  160.     if( !document.links ) {
  161.       document.links = document.getElementsByTagName("a");
  162.     }
  163.     var links = document.links;
  164.     for (var a = 0, len = links.length; a < len ; a++) {
  165.       var link = links[a];
  166.       linkhref = link.href;
  167.  
  168.       if (linkhref.match(/^rss:/) ||
  169.           linkhref.match(/^(http|ftp|feed).*([\.\/]rss([\.\/]xml|\.aspx|\.jsp|\/)?$|\/node\/feed$|\/rss\/[a-z0-9]+$|[?&;](rss|xml|rdf)=|[?&;]feed=rss[0-9.]*$|[?&;]action=rss_rc$|feeds\.feedburner\.com\/[a-z0-9]+$)/i)) {
  170.         addRssLinkTag(linkhref, RSS_ICON, "rss");
  171.       } else if (linkhref.match(/^(http|ftp|feed).*\/atom(\.xml|\.aspx|\.jsp|\/)?$|[?&;]feed=atom[0-9.]*$/i)) {
  172.         addRssLinkTag(linkhref, ATOM_ICON, "atom");
  173.       } else if (linkhref.match(/^(http|ftp|feed).*(\/feeds?\/[^.\/]*\.xml$|.*\/index\.xml$|feed\/msgs\.xml(\?num=\d+)?$)/i)) {
  174.         addRssLinkTag(linkhref, XML_ICON, "rss");
  175.       } else if (linkhref.match(/^(http|ftp|feed).*\.rdf$/i)) {
  176.         addRssLinkTag(linkhref, RDF_ICON, "rss");
  177.       } else if (linkhref.match(/^feed:\/\//i)) {
  178.         addRssLinkTag(linkhref, RSS_ICON, "rss");
  179.       }
  180.     }
  181.   }
  182.  
  183.   function beenThere(linkhref) {
  184.     if (seen.length <= 0) return false;
  185.  
  186.     var href = linkhref.toLowerCase();
  187.     for (var i = seen.length-1; i >=0; --i) {
  188.       if (seen[i].toLowerCase() == href) return true;
  189.     }
  190.  
  191.     return false;
  192.   }
  193.  
  194.   function moreFSB() {
  195.     var elem;
  196.     for (var i = 1; ; i++) {
  197.       elem = document.getElementById("XmlButton" + i);
  198.       if (!elem) break;
  199.       try {elem.style.display = "inline";} catch(e) {}
  200.     }
  201.     document.getElementById("MoreFSBButton").style.display = 'none';
  202.     return false;
  203.   }
  204.  
  205.   function addRssLinkTag(linkhref, icon, addheadtype) {
  206.     if (beenThere(linkhref)) {
  207.       return;
  208.     } else {
  209.       seen.push(linkhref);
  210.     }
  211.  
  212.     if (seen.length == (INITIAL_COUNT + 1)) {
  213.       var moreButton = document.createElement('a');
  214.       moreButton.innerHTML = MORE_ICON;
  215.       moreButton.style.display = 'inline';
  216.       moreButton.style.cursor = 'pointer';
  217.       moreButton.id = 'MoreFSBButton';
  218.       addEventHandler(moreButton, 'click', moreFSB);
  219.       fsbdiv.appendChild(moreButton);
  220.       fsbdiv.appendChild(document.createTextNode(" "));
  221.     }
  222.     var flink = document.createElement("a");
  223.     flink.innerHTML = icon;
  224.     flink.href = linkhref;
  225.     // TWEAK NOTE 2 START : Uncomment the href line below to retore linking
  226.     // to purl.org pages for easy subscription in feed readers. This service
  227.     // creates link for all known aggregators which support RSS subscription
  228.     // service via a URL.
  229.  
  230.     // href = "http://purl.org/net/syndication/subscribe/?rss=" + linkhref;
  231.  
  232.     // TWEAK NOTE 2 END
  233.     flink.alt = linkhref;
  234.     flink.title = linkhref;
  235.     flink.id = 'XmlButton' + seen.length;
  236.     if (seen.length >= (INITIAL_COUNT + 1)) {
  237.       flink.style.display = 'none';
  238.     }
  239.     fsbdiv.appendChild(flink);
  240.     fsbdiv.appendChild(document.createTextNode(" "));
  241.     // <link href="url" rel="alternate" title="desc" type="application/rss+xml" />
  242.     if (addheadtype && head) {
  243.       var link = document.createElement("link");
  244.       link.href=linkhref;
  245.       link.rel="alternate";
  246.       link.title=linkhref + " (discovered by RSS+Atom Feed Subscribe Button Generator)";
  247.       link.type="application/" + addheadtype + "+xml";
  248.       head.appendChild(link);
  249.     }
  250.  
  251.   }
  252.  
  253.   getKnownTags();
  254.   discoverUnknownFeeds();
  255.  
  256.   var body = document.getElementsByTagName("body")[0];
  257.  
  258.   function closeFSB() {
  259.     try {
  260.       document.getElementById("XmlButtons").style.display = 'none';
  261.     } catch(e) {}
  262.   }
  263.  
  264.   // insert the div only if something was found
  265.   if (seen.length > 0) {
  266.     if (head) {
  267.       var closeButton = document.createElement('a');
  268.       closeButton.innerHTML = CLOSE_ICON;
  269.       addEventHandler(closeButton, 'click', closeFSB);
  270.       closeButton.style.display = 'inline';
  271.       closeButton.style.cursor = 'pointer';
  272.     }
  273.     fsbdiv.insertBefore(closeButton, fsbdiv.firstChild);
  274.     setTimeout(function() {
  275.       body.insertBefore(fsbdiv, body.firstChild);
  276.     }, 333); // hack to workaround the duplicated content problem
  277.   }
  278. })();