111 lines
3.8 KiB
JavaScript
111 lines
3.8 KiB
JavaScript
var thisPageLinkObjects = null;
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// I convert the native "link" node into an object that I can pass out to the global page
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function objectFromLink(theLink) {
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var linkObject = new Object();
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linkObject.href = theLink.href;
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linkObject.type = theLink.type;
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linkObject.title = theLink.title;
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return linkObject;
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}
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// Some sites will list feeds with inappropriate or at least less-than-ideal information
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// in the MIME type attribute. We cover some edge cases here that allow to be passed through,
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// where they will successfully open as "feed://" URLs in the browser.
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function isValidFeedLink(theLink) {
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var isValid = false;
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switch (theLink.type)
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{
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case "application/atom+xml":
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case "application/x.atom+xml":
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case "application/rss+xml":
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// These types do not require other criteria.
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isValid = (theLink.href != null);
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case "text/xml":
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case "application/rdf+xml":
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// These types require a title that has "RSS" in it.
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if (theLink.title && theLink.title.search(/RSS/i) != -1)
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{
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isValid = (theLink.href != null);
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}
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}
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return isValid;
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}
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function scanForSyndicationFeeds() {
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// In case we don't find any, we establish that we have at least tried by setting the
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// variables to empty instead of null.
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thisPageLinkObjects = []
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thisPageLinks = document.querySelectorAll("link[href][rel~='alternate'][type]");
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for (thisLinkIndex = 0; thisLinkIndex < thisPageLinks.length; thisLinkIndex++)
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{
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var thisLink = thisPageLinks[thisLinkIndex];
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if (isValidFeedLink(thisLink))
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{
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thisPageLinkObjects.push(objectFromLink(thisLink));
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}
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}
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}
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function subscribeToFeed(theFeed) {
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// Convert the URL to a feed:// scheme because Safari
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// will refuse to load e.g. a feed that is listed merely
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// as "text/xml". We do some preflighting of the link rel
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// in the PageLoadEnd.js so we can be more confident it's a
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// good feed: URL.
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var feedURL = theFeed.href;
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if (!feedURL.startsWith('feed:'))
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{
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feedURL = 'feed:' + feedURL;
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}
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safari.extension.dispatchMessage("subscribeToFeed", { "url": feedURL });
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}
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function messageHandler(event) {
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if (event.name === "toolbarButtonClicked")
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{
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// Workaround Radar #31182842, in which residual copies of our
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// app extension may remain loaded in context of pages in Safari,
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// causing multiple responses to broadcast message about toolbar
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// button being clicked. In the case of the "extra" injections,
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// the document location is null, so we can avoid doing on anything.
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if ((document.location != null) && (thisPageLinkObjects.length > 0))
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{
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feedToOpen = thisPageLinkObjects[0];
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subscribeToFeed(feedToOpen);
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}
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}
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else if (event.name === "ping")
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{
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// Just a hack to get the toolbar icon validation to work as expected.
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// If we don't pong back, the extension knows we are not loaded in a page.
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// There is a bug in Safari where the messageHandler is apparently held on to by Safari
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// even after an extension is disabled. So an effort to "ping" an extension's scripts will
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// succeed even if its been disabled and the page reloaded. Checking for the existance of
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// document.location seems to ensure we have enough of a handle still on the document that
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// we can do something useful with it.
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var shouldValidate = (document.location != null) && (thisPageLinkObjects.length > 0);
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// Pass back the same validationID we were handed so they can look up the correlated validationHandler
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safari.extension.dispatchMessage("pong", { "validationID": event.message.validationID, "shouldValidate": shouldValidate });
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}
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}
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document.addEventListener("DOMContentLoaded", function(event) {
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// Prevent injecting the JavaScript in IFRAMES, and from acting before Safari is ready...
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if ((window.top === window) && (typeof safari != 'undefined') && (document.location != null))
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{
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safari.self.addEventListener("message", messageHandler, false)
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scanForSyndicationFeeds();
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}
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});
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