Merge pull request #384 from danielpunkass/safari-extension
Safari extension for "Subscribe to Feed"
This commit is contained in:
Brent Simmons
GitHub
commit
86b1aef07f
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@ -7,6 +7,12 @@
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@ -1090,6 +1145,7 @@
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@ -1114,6 +1170,7 @@
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@ -1278,6 +1335,7 @@
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@ -1420,6 +1495,7 @@
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@ -0,0 +1,30 @@
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<key>CFBundleDisplayName</key>
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<string>Subscribe to Feed</string>
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<string>com.apple.Safari.extension</string>
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<key>NSExtensionPrincipalClass</key>
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<string>$(PRODUCT_MODULE_NAME).SafariExtensionHandler</string>
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<key>SFSafariContentScript</key>
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|
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<key>Script</key>
|
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<string>evergreen-subscribe-to-feed.js</string>
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<key>SFSafariToolbarItem</key>
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<dict>
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<key>Action</key>
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<string>Command</string>
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<key>Identifier</key>
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<string>Button</string>
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<key>Image</key>
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<string>ToolbarItemIcon.pdf</string>
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<key>Label</key>
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||||
<string>Subscribe to Feed</string>
|
||||
</dict>
|
||||
<key>SFSafariWebsiteAccess</key>
|
||||
<dict>
|
||||
<key>Allowed Domains</key>
|
||||
<array>
|
||||
<string>*.*</string>
|
||||
</array>
|
||||
<key>Level</key>
|
||||
<string>All</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>NSHumanReadableCopyright</key>
|
||||
<string>Copyright © 2018 Ranchero Software. All rights reserved.</string>
|
||||
<key>NSHumanReadableDescription</key>
|
||||
<string>This extension adds a Safari toolbar button for easily subscribing to the syndication feed for the current page.</string>
|
||||
</dict>
|
||||
</plist>
|
||||
|
|
@ -0,0 +1,116 @@
|
|||
//
|
||||
// SafariExtensionHandler.swift
|
||||
// Subscribe to Feed
|
||||
//
|
||||
// Created by Daniel Jalkut on 6/11/18.
|
||||
// Copyright © 2018 Ranchero Software. All rights reserved.
|
||||
//
|
||||
|
||||
import SafariServices
|
||||
|
||||
class SafariExtensionHandler: SFSafariExtensionHandler {
|
||||
|
||||
// Safari App Extensions don't support any reasonable means of detecting whether a
|
||||
// specific Safari page was loaded with the benefit of the extension's injected
|
||||
// JavaScript. For this reason a condition can easily be reached where the toolbar
|
||||
// icon is active for a page, but the expected supporting code is not loaded into
|
||||
// the page. To detect this and disable our icon, we use a kind of "ping" trick
|
||||
// to verify whether our code is installed.
|
||||
|
||||
// I tried to use a NSMapTable from String to the closure directly, but Swift
|
||||
// complains that the object as to be a class type.
|
||||
typealias ValidationHandler = (Bool, String) -> Void
|
||||
class ValidationWrapper {
|
||||
let validationHandler: ValidationHandler
|
||||
|
||||
init(validationHandler: @escaping ValidationHandler) {
|
||||
self.validationHandler = validationHandler
|
||||
}
|
||||
}
|
||||
|
||||
// Maps from UUID to a validation wrapper
|
||||
static var gPingPongMap = Dictionary<String, ValidationWrapper>()
|
||||
|
||||
// Bottleneck for calling through to a validation handler we have saved, and removing it from the list.
|
||||
static func callValidationHandler(forHandlerID handlerID: String, withShouldValidate shouldValidate: Bool) {
|
||||
if let validationWrapper = gPingPongMap[handlerID] {
|
||||
validationWrapper.validationHandler(shouldValidate, "")
|
||||
gPingPongMap.removeValue(forKey: handlerID)
|
||||
}
|
||||
}
|
||||
|
||||
var validationQueue = DispatchQueue(label: "Toolbar Validation")
|
||||
|
||||
override func messageReceived(withName messageName: String, from page: SFSafariPage, userInfo: [String : Any]?) {
|
||||
if (messageName == "subscribeToFeed") {
|
||||
if let feedURLString = userInfo?["url"] as? String {
|
||||
if let feedURL = URL(string: feedURLString) {
|
||||
// We could do something more Evergreen-specific like invoke an app-specific scheme
|
||||
// to subscribe in the app. For starters we just let NSWorkspace open the URL in the
|
||||
// default "feed:" URL scheme handler.
|
||||
NSWorkspace.shared.open(feedURL)
|
||||
}
|
||||
}
|
||||
}
|
||||
else if (messageName == "pong") {
|
||||
if let validationIDString = userInfo?["validationID"] as? String {
|
||||
// Should we validate the button?
|
||||
let shouldValidate = userInfo?["shouldValidate"] as? Bool ?? false
|
||||
SafariExtensionHandler.callValidationHandler(forHandlerID: validationIDString, withShouldValidate:shouldValidate)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
override func toolbarItemClicked(in window: SFSafariWindow) {
|
||||
window.getActiveTab { (activeTab) in
|
||||
activeTab?.getActivePage(completionHandler: { (activePage) in
|
||||
activePage?.dispatchMessageToScript(withName: "toolbarButtonClicked", userInfo: nil)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
override func validateToolbarItem(in window: SFSafariWindow, validationHandler: @escaping ((Bool, String) -> Void)) {
|
||||
|
||||
let uniqueValidationID = NSUUID().uuidString
|
||||
|
||||
// Save it right away to eliminate any doubt of whether the handler gets deallocated while
|
||||
// we are waiting for a callback from the getActiveTab or getActivatePage methods below.
|
||||
let validationWrapper = ValidationWrapper(validationHandler: validationHandler)
|
||||
SafariExtensionHandler.gPingPongMap[uniqueValidationID] = validationWrapper
|
||||
|
||||
validationQueue.sync {
|
||||
// See comments above where gPingPongMap is declared. Upon being asked to validate the
|
||||
// toolbar icon for a specific page, we save the validationHandler and postpone calling
|
||||
// it until we have either received a response from our installed JavaScript, or until
|
||||
// a timeout period has elapsed
|
||||
window.getActiveTab { (activeTab) in
|
||||
guard let activeTab = activeTab else {
|
||||
SafariExtensionHandler.callValidationHandler(forHandlerID: uniqueValidationID, withShouldValidate:false);
|
||||
return
|
||||
}
|
||||
|
||||
activeTab.getActivePage { (activePage) in
|
||||
guard let activePage = activePage else {
|
||||
SafariExtensionHandler.callValidationHandler(forHandlerID: uniqueValidationID, withShouldValidate:false);
|
||||
return
|
||||
}
|
||||
|
||||
activePage.getPropertiesWithCompletionHandler { (pageProperties) in
|
||||
if let isActive = pageProperties?.isActive {
|
||||
if isActive {
|
||||
// Capture the uniqueValidationID to ensure it doesn't change out from under us on a future call
|
||||
activePage.dispatchMessageToScript(withName: "ping", userInfo: ["validationID": uniqueValidationID])
|
||||
|
||||
let pongTimeoutInNanoseconds = Int(NSEC_PER_SEC / UInt64(1))
|
||||
let timeoutDeadline = DispatchTime.now() + DispatchTimeInterval.nanoseconds(pongTimeoutInNanoseconds)
|
||||
DispatchQueue.main.asyncAfter(deadline: timeoutDeadline, execute: { [timedOutValidationID = uniqueValidationID] in
|
||||
SafariExtensionHandler.callValidationHandler(forHandlerID: timedOutValidationID, withShouldValidate:false)
|
||||
})
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
//
|
||||
// SafariExtensionViewController.swift
|
||||
// Subscribe to Feed
|
||||
//
|
||||
// Created by Daniel Jalkut on 6/11/18.
|
||||
// Copyright © 2018 Ranchero Software. All rights reserved.
|
||||
//
|
||||
|
||||
import SafariServices
|
||||
|
||||
class SafariExtensionViewController: SFSafariExtensionViewController {
|
||||
|
||||
// This would be the place to handle a popover that could, for example, list the possibly multiple feeds offered by a site.
|
||||
static let shared: SafariExtensionViewController = {
|
||||
let shared = SafariExtensionViewController()
|
||||
shared.preferredContentSize = NSSize(width:320, height:240)
|
||||
return shared
|
||||
}()
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
|
||||
<plist version="1.0">
|
||||
<dict>
|
||||
<key>com.apple.security.app-sandbox</key>
|
||||
<true/>
|
||||
</dict>
|
||||
</plist>
|
||||
Binary file not shown.
Binary file not shown.
|
|
@ -0,0 +1,124 @@
|
|||
// Prevent injecting the JavaScript in IFRAMES, and from acting before Safari is ready...
|
||||
if ((window.top === window) && (typeof safari != 'undefined') && (document.location != null)) {
|
||||
document.addEventListener("DOMContentLoaded", function(event) {
|
||||
if (window.top === window)
|
||||
{
|
||||
var thisPageLinkObjects = null;
|
||||
|
||||
// I convert the native "link" node into an object that I can pass out to the global page
|
||||
function objectFromLink(theLink)
|
||||
{
|
||||
var linkObject = new Object();
|
||||
|
||||
linkObject.href = theLink.href;
|
||||
linkObject.type = theLink.type;
|
||||
linkObject.title = theLink.title;
|
||||
|
||||
return linkObject;
|
||||
}
|
||||
|
||||
// Some sites will list feeds with inappropriate or at least less-than-ideal information
|
||||
// in the MIME type attribute. We cover some edge cases here that allow to be passed through,
|
||||
// where they will successfully open as "feed://" URLs in the browser.
|
||||
function isValidFeedLink(theLink)
|
||||
{
|
||||
var isValid = false;
|
||||
|
||||
switch (theLink.type)
|
||||
{
|
||||
case "application/atom+xml":
|
||||
case "application/x.atom+xml":
|
||||
case "application/rss+xml":
|
||||
// These types do not require other criteria.
|
||||
isValid = (theLink.href != null);
|
||||
|
||||
case "text/xml":
|
||||
case "application/rdf+xml":
|
||||
// These types require a title that has "RSS" in it.
|
||||
if (theLink.title && theLink.title.search(/RSS/i) != -1)
|
||||
{
|
||||
isValid = (theLink.href != null);
|
||||
}
|
||||
}
|
||||
|
||||
return isValid;
|
||||
}
|
||||
|
||||
function scanForSyndicationFeeds()
|
||||
{
|
||||
// In case we don't find any, we establish that we have at least tried by setting the
|
||||
// variables to empty instead of null.
|
||||
thisPageLinkObjects = []
|
||||
|
||||
thisPageLinks = document.getElementsByTagName("link");
|
||||
|
||||
for (thisLinkIndex = 0; thisLinkIndex < thisPageLinks.length; thisLinkIndex++)
|
||||
{
|
||||
var thisLink = thisPageLinks[thisLinkIndex];
|
||||
var thisLinkRel = thisLink.getAttribute("rel");
|
||||
if (thisLinkRel == "alternate")
|
||||
{
|
||||
if (isValidFeedLink(thisLink))
|
||||
{
|
||||
thisPageLinkObjects.push(objectFromLink(thisLink));
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function subscribeToFeed(theFeed)
|
||||
{
|
||||
// Convert the URL to a feed:// scheme because Safari
|
||||
// will refuse to load e.g. a feed that is listed merely
|
||||
// as "text/xml". We do some preflighting of the link rel
|
||||
// in the PageLoadEnd.js so we can be more confident it's a
|
||||
// good feed: URL.
|
||||
var feedURL = theFeed.href;
|
||||
if (feedURL.match(/^http[s]?:\/\//))
|
||||
{
|
||||
feedURL = feedURL.replace(/^http[s]?:\/\//, "feed://");
|
||||
}
|
||||
else if (feedURL.match(/^feed:/) == false)
|
||||
{
|
||||
feedURL = "feed:" + feedURL;
|
||||
}
|
||||
|
||||
safari.extension.dispatchMessage("subscribeToFeed", { "url": feedURL });
|
||||
}
|
||||
|
||||
safari.self.addEventListener("message", function(event)
|
||||
{
|
||||
if (event.name === "toolbarButtonClicked")
|
||||
{
|
||||
// Workaround Radar #31182842, in which residual copies of our
|
||||
// app extension may remain loaded in context of pages in Safari,
|
||||
// causing multiple responses to broadcast message about toolbar
|
||||
// button being clicked. In the case of the "extra" injections,
|
||||
// the document location is null, so we can avoid doing on anything.
|
||||
if ((document.location != null) && (thisPageLinkObjects.length > 0))
|
||||
{
|
||||
feedToOpen = thisPageLinkObjects[0];
|
||||
subscribeToFeed(feedToOpen);
|
||||
}
|
||||
}
|
||||
else if (event.name === "ping")
|
||||
{
|
||||
// Just a hack to get the toolbar icon validation to work as expected.
|
||||
// If we don't pong back, the extension knows we are not loaded in a page.
|
||||
|
||||
// There is a bug in Safari where the messageHandler is apparently held on to by Safari
|
||||
// even after an extension is disabled. So an effort to "ping" an extension's scripts will
|
||||
// succeed even if its been disabled and the page reloaded. Checking for the existance of
|
||||
// document.location seems to ensure we have enough of a handle still on the document that
|
||||
// we can do something useful with it.
|
||||
var shouldValidate = (document.location != null) && (thisPageLinkObjects.length > 0);
|
||||
|
||||
// Pass back the same validationID we were handed so they can look up the correlated validationHandler
|
||||
safari.extension.dispatchMessage("pong", { "validationID": event.message.validationID, "shouldValidate": shouldValidate });
|
||||
}
|
||||
}, false);
|
||||
|
||||
scanForSyndicationFeeds();
|
||||
}
|
||||
});
|
||||
}
|
||||
Loading…
Reference in New Issue