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58 lines
2.4 KiB
Swift
58 lines
2.4 KiB
Swift
//
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// SafariWebExtensionHandler.swift
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// TabFS Extension
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//
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// Created by Omar Rizwan on 1/31/21.
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//
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import SafariServices
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import os.log
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class SafariWebExtensionHandler: NSObject, NSExtensionRequestHandling {
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func beginRequest(with context: NSExtensionContext) {
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let item = context.inputItems[0] as! NSExtensionItem
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guard let message = item.userInfo?["message"] as? [AnyHashable: Any] else { return }
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guard message["op"] as! String == "safari_did_connect" else { return }
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// The XPC service is a subprocess that lives outside the macOS App Sandbox.
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// (Safari extension native code, including this file, has to live in the sandbox.)
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// It can do forbidden things like spawn tabfs filesystem and set up WebSocket server.
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// We only use one native message to bootstrap the XPC service, then do all communications
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// to that service (which in turn talks to tabfs.c) over WebSocket instead.
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// (Safari makes doing native messaging quite painful, so we try to avoid it.
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// It forces the browser to pop to front if you message Safari in the obvious way,
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// for instance: https://developer.apple.com/forums/thread/122232
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// And with the WebSocket, the XPC service can talk straight to background.js, whereas
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// native messaging would require us here to sit in the middle.)
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let connection = NSXPCConnection(serviceName: "com.rsnous.TabFSService")
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connection.remoteObjectInterface = NSXPCInterface(with: TabFSServiceProtocol.self)
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connection.resume()
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let service = connection.remoteObjectProxyWithErrorHandler { error in
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os_log(.default, "Received error: %{public}@", error as CVarArg)
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} as? TabFSServiceProtocol
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// Need this one XPC call to actually initialize the service.
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service?.start() {
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os_log(.default, "Response from XPC service")
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// FIXME: report port back?
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let response = NSExtensionItem()
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response.userInfo = [ "message": "alive" ]
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// This response (over native messaging) prompts background.js to
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// connect to the WebSocket server that the XPC service should now be running.
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context.completeRequest(returningItems: [response]) { (what) in
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print(what)
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}
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}
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return
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}
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}
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