I have a macOS Share Extension invoked when users tap the Share button in Safari. I'm trying to get the page's URL from the -[NSExtensionItem attachments]
attribute, but it comes as an NSSecureCoding
object, and I'm unable to read the URL from it.
In the loadView
method, I'm filtering and loading the attachments of type public.url
:
override func loadView() {
super.loadView()
guard let inputItem = extensionContext?.inputItems.first as? NSExtensionItem else {
print("Didn't received input item from action.")
return
}
var itemProvider: NSItemProvider?
itemProvider = inputItem.attachments?.filter({ $0.registeredTypeIdentifiers.contains("public.url") }).first ?? inputItem.attachments?.filter({ $0.registeredTypeIdentifiers.contains("public.plain-text") }).first
guard let itemProvider = itemProvider else {
print("Didn't received attachments from input item.")
return
}
if itemProvider.canLoadObject(ofClass: URL.self) {
itemProvider.loadItem(forTypeIdentifier: "public.url", completionHandler: onl oadVideoURL)
} else if itemProvider.canLoadObject(ofClass: String.self) {
itemProvider.loadItem(forTypeIdentifier: "public.plain-text", completionHandler: onl oadVideoURL)
} else {
print("This action only supports URL and String.")
}
}
The itemProvider.loadItem
method runs for the type identifier public.url
, calling the completion handler bellow:
@objc private func onl oadVideoURL(dict: NSSecureCoding?, error: Error?) {
print("URL: \(dict.debugDescription)")
// ...
}
But the content that it prints to the console is:
URL: Optional(<68747470 733a2f2f 73746163 6b6f7665 72666c6f 772e636f 6d2f7175 65737469 6f6e732f 35323231 39373030 2f686f77 2d746f2d 63617374 2d6e7373 65637572 65636f64 696e672d 746f2d6d 6b6d6170 6974656d 2d696e2d 61637469 6f6e2d65 7874656e 73696f6e>)
The same code works as expected on iOS, printing the shared URL to the console.
Do I have to somehow convert this NSSecureCoding
to URL
or another object? Or should I do this in a completely different way on macOS? The goal is to access the page's URL from the Share Extension activated when the user selects it in the Share Menu.
CodePudding user response:
Turns out that the NSSecureCoding
content was the URL, but in hexadecimal. Here's how I'm converting it to String:
let urlHex = dict.debugDescription
.replacingOccurrences(of: "Optional(", with: "")
.replacingOccurrences(of: ")", with: "")
.replacingOccurrences(of: "<", with: "")
.replacingOccurrences(of: ">", with: "")
.replacingOccurrences(of: " ", with: "")
guard let urlHexData = Data(fromHexEncodedString: urlHex) else { return }
guard let url = String(data: urlHexData, encoding: .utf8) else { return }
extension Data {
// From http://stackoverflow.com/a/40278391
init?(fromHexEncodedString string: String) {
func decodeNibble(u: UInt16) -> UInt8? {
switch(u) {
case 0x30 ... 0x39:
return UInt8(u - 0x30)
case 0x41 ... 0x46:
return UInt8(u - 0x41 10)
case 0x61 ... 0x66:
return UInt8(u - 0x61 10)
default:
return nil
}
}
self.init(capacity: string.utf16.count/2)
var even = true
var byte: UInt8 = 0
for c in string.utf16 {
guard let val = decodeNibble(u: c) else { return nil }
if even {
byte = val << 4
} else {
byte = val
self.append(byte)
}
even = !even
}
guard even else { return nil }
}
}