mirror of
https://github.com/acamarata/curtain.git
synced 2026-06-30 18:54:25 +00:00
709669e0cb
Menu-bar agent that, on a Screen Sharing connection, covers the host displays and blocks physical keyboard/mouse from the apps while remote input passes through, then locks the Mac on idle or disconnect. - netstat-based session detection (debounced) - CGEventTap input filter (block physical sourceStateID==1, pass remote) - .none/.readOnly cover windows with on-curtain password box - SACLockScreenImmediate lock + IOKit display-sleep assertion - root helper (NOPASSWD) to disconnect the Screen Sharing session - install/uninstall scripts, app bundle, login agent, CI
65 lines
3.1 KiB
Swift
65 lines
3.1 KiB
Swift
import Cocoa
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/// Purpose: Block PHYSICAL keyboard/mouse from reaching apps while passing REMOTE
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/// (Screen Sharing) input through, so the host desk is inert but the
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/// remote operator controls normally.
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/// How: a CGEventTap inspects each event's source-state. Physical hardware events
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/// report sourceStateID == 1 (kCGEventSourceStateHIDSystemState); Screen
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/// Sharing injects synthetic events with a large per-session state ID (!= 1).
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/// Verified empirically (see Lessons). Block ==1, pass everything else.
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/// Constraints: requires Accessibility permission. Physical key-downs are routed
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/// to `onPhysicalKey` to drive the password box.
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/// SPORT: MASTER-INPUTFILTER
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final class InputFilter {
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private var tap: CFMachPort?
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private var runLoopSource: CFRunLoopSource?
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var onPhysicalKey: ((Int, String?) -> Void)?
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/// Returns false if the tap could not be created (missing Accessibility).
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@discardableResult
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func start() -> Bool {
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let types: [CGEventType] = [.keyDown, .keyUp, .flagsChanged, .mouseMoved,
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.leftMouseDown, .leftMouseUp, .rightMouseDown, .rightMouseUp,
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.otherMouseDown, .otherMouseUp, .leftMouseDragged, .rightMouseDragged, .scrollWheel]
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let mask: CGEventMask = types.reduce(CGEventMask(0)) { $0 | (CGEventMask(1) << $1.rawValue) }
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let me = Unmanaged.passUnretained(self).toOpaque()
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guard let t = CGEvent.tapCreate(tap: .cgSessionEventTap, place: .headInsertEventTap,
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options: .defaultTap, eventsOfInterest: mask, callback: callback, userInfo: me) else {
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return false
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}
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tap = t
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let src = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, t, 0)
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runLoopSource = src
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CFRunLoopAddSource(CFRunLoopGetCurrent(), src, .commonModes)
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CGEvent.tapEnable(tap: t, enable: true)
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return true
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}
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func stop() {
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if let t = tap { CGEvent.tapEnable(tap: t, enable: false) }
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if let s = runLoopSource { CFRunLoopRemoveSource(CFRunLoopGetCurrent(), s, .commonModes) }
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tap = nil; runLoopSource = nil
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}
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fileprivate func handlePhysicalKeyDown(_ event: CGEvent) {
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let kc = Int(event.getIntegerValueField(.keyboardEventKeycode))
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let chars = NSEvent(cgEvent: event)?.charactersIgnoringModifiers
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DispatchQueue.main.async { self.onPhysicalKey?(kc, chars) }
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}
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fileprivate func reenable() { if let t = tap { CGEvent.tapEnable(tap: t, enable: true) } }
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}
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private let callback: CGEventTapCallBack = { _, type, event, refcon in
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let filter = Unmanaged<InputFilter>.fromOpaque(refcon!).takeUnretainedValue()
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if type == .tapDisabledByTimeout || type == .tapDisabledByUserInput {
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filter.reenable()
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return Unmanaged.passUnretained(event)
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}
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let physical = (event.getIntegerValueField(.eventSourceStateID) == 1)
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if physical {
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if type == .keyDown { filter.handlePhysicalKeyDown(event) }
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return nil // block hardware input from apps
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}
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return Unmanaged.passUnretained(event) // pass remote (synthetic) input
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}
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