vOOice/VoiceInk/Services/PasteEligibilityService.swift

import Cocoa

class PasteEligibilityService {
    static func isPastePossible() -> Bool {
        guard AXIsProcessTrustedWithOptions(nil) else {
            return true
        }

        guard let frontmostApp = NSWorkspace.shared.frontmostApplication else {
            return false
        }

        let appElement = AXUIElementCreateApplication(frontmostApp.processIdentifier)

        var focusedElement: AnyObject?
        let result = AXUIElementCopyAttributeValue(appElement, kAXFocusedUIElementAttribute as CFString, &focusedElement)

        guard result == .success, let element = focusedElement else {
            return false
        }

        var isWritable: DarwinBoolean = false
        let isSettableResult = AXUIElementIsAttributeSettable(element as! AXUIElement, kAXValueAttribute as CFString, &isWritable)

        if isSettableResult == .success && isWritable.boolValue {
            return true
        }

        return false
    }
}