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1 var AmbNews = {
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2 url: function url(spec) {
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3 if (typeof(spec) != "string")
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4 // Assume that a URI object was passed in, so just return it back.
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5 return spec;
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6 var classObj = Components.classes["@mozilla.org/network/io-service;1"];
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7 var ios = classObj.getService(Components.interfaces.nsIIOService);
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8 return ios.newURI(spec, null, null);
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9 },
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10 getFeed: function AmbNews_getFeed(url, callback) {
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11 function onXml(text) {
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12 var feed = null;
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13 if (text) {
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14 var resultListener = {
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15 handleResult: function resultListener_handleResult(aResult) {
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16 feed = {};
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17 var nsIFeed = aResult.doc;
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18 var Ci = Components.interfaces;
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19 nsIFeed.QueryInterface(Ci.nsIFeed);
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20 feed.link = nsIFeed.link;
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21 feed.title = nsIFeed.title;
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22 feed.entries = [];
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23 for (var i = 0; i < nsIFeed.items.length; i++) {
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24 var item = nsIFeed.items.queryElementAt(i, Ci.nsIFeedEntry);
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25 feed.entries.push(item);
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26 }
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27 }
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28 };
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29 var fp = AmbNews.__getFeedProcessor();
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30 fp.listener = resultListener;
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31 fp.parseFromString(text, AmbNews.url(url));
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32 }
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33 callback(feed);
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34 }
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35 AmbNews.__getXml(url, onXml);
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36 },
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37 __getXml: function AmbNews_getXml(url, callback) {
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38 var feedUrl = AmbNews.url(url);
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39 var annSvc = AmbNews.__getAnnSvc();
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40
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41 if (annSvc.pageHasAnnotation(feedUrl, "AmbNews/feed-xml")) {
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42 var xml = annSvc.getPageAnnotation(feedUrl, "AmbNews/feed-xml");
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43 // TODO: Perhaps re-enable this, but only let it live for a
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44 // few minutes?
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45 //callback(xml);
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46 //return;
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47 }
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48
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49 var request = new XMLHttpRequest();
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50 request.open("GET", url, true);
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51
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52 var onRscFunc = function getXml_onReadyStateChange() {
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53 if (request.readyState == 4) {
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54 if (request.status == 200) {
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55 if (request.responseText) {
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56 annSvc.setPageAnnotation(feedUrl,
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57 "AmbNews/feed-xml",
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58 request.responseText,
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59 0,
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60 annSvc.EXPIRE_DAYS);
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61 callback(request.responseText);
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62 } else
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63 callback("");
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64 } else
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65 callback("");
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66 }
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67 };
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68
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69 request.onreadystatechange = onRscFunc;
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70 request.send(null);
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71 },
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72 __getFeedProcessor: function AmbNews_getFeedProcessor() {
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73 var Cc = Components.classes;
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74 var Ci = Components.interfaces;
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75 var fp = Cc["@mozilla.org/feed-processor;1"]
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76 .createInstance(Ci.nsIFeedProcessor);
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77 return fp;
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78 },
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79 __getAnnSvc: function AmbNews_getAnnSvc() {
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80 var Cc = Components.classes;
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81 var annSvc = Cc["@mozilla.org/browser/annotation-service;1"]
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82 .getService(Components.interfaces.nsIAnnotationService);
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83 return annSvc;
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84 },
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85 onLinkAdded: function AmbNews_onLinkAdded(aEvent) {
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86 if (aEvent.target.rel == "alternate" &&
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87 (aEvent.target.type == "application/rss+xml" ||
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88 aEvent.target.type == "application/atom+xml")) {
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89 var annSvc = AmbNews.__getAnnSvc();
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90 var page = AmbNews.url(aEvent.target.baseURI);
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91 var feed = AmbNews.url(aEvent.target.href);
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92 annSvc.setPageAnnotation(page, "AmbNews/feed",
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93 feed.spec, 0, annSvc.EXPIRE_WEEKS);
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94 }
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95 }
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96 };
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