Detect TestFlight on macOS

Move function to Utils.

Passepartout/App/Constants/Constants+Extensions.swift

@@ -53,13 +53,9 @@ extension Constants {
             }
         }
 
-        static var isBeta: Bool {
-            #if targetEnvironment(simulator)
-            return true
-            #else
-            return Bundle.main.appStoreReceiptURL?.lastPathComponent == "sandboxReceipt"
-            #endif
-        }
+        static let isBeta: Bool = {
+            Bundle.main.isTestFlight
+        }()
     }
 
     enum InApp {

PassepartoutCore/Sources/PassepartoutUtils/Utils/Utils+TestFlight.swift

@@ -0,0 +1,72 @@
+//
+//  Utils+TestFlight.swift
+//  Passepartout
+//
+//  Created by Davide De Rosa on 5/18/22.
+//  Copyright (c) 2022 Davide De Rosa. All rights reserved.
+//
+//  https://github.com/passepartoutvpn
+//
+//  This file is part of Passepartout.
+//
+//  Passepartout is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  Passepartout is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with Passepartout.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+import Foundation
+
+// https://stackoverflow.com/a/32238344/784615
+// https://gist.github.com/lukaskubanek/cbfcab29c0c93e0e9e0a16ab09586996
+
+extension Bundle {
+    public var isTestFlight: Bool {
+        #if targetEnvironment(simulator)
+        return true
+        #elseif targetEnvironment(macCatalyst) || os(macOS)
+        var status = noErr
+
+        var code: SecStaticCode?
+        status = SecStaticCodeCreateWithPath(bundleURL as CFURL, [], &code)
+        guard status == noErr else {
+            return false
+        }
+        guard let code = code else {
+            return false
+        }
+
+        var requirement: SecRequirement?
+        status = SecRequirementCreateWithString(
+            "anchor apple generic and certificate leaf[field.1.2.840.113635.100.6.1.25.1]" as CFString,
+            [], // default
+            &requirement
+        )
+        guard status == noErr else {
+            return false
+        }
+        guard let requirement = requirement else {
+            return false
+        }
+
+        status = SecStaticCodeCheckValidity(
+            code,
+            [], // default
+            requirement
+        )
+        return status == errSecSuccess
+        #elseif os(iOS)
+        return appStoreReceiptURL?.lastPathComponent == "sandboxReceipt"
+        #else
+        return false
+        #endif
+    }
+}