Revert "Modernize check for TestFlight build" (#880)

Reverts passepartoutvpn/passepartout#875

Passepartout/Library/Sources/CommonUtils/Business/SandboxChecker.swift

@@ -24,26 +24,86 @@
 //
 
 import Foundation
-import StoreKit
 
-// https://developer.apple.com/forums/thread/694461
+// https://stackoverflow.com/a/32238344/784615
+// https://gist.github.com/lukaskubanek/cbfcab29c0c93e0e9e0a16ab09586996
 
 public final class SandboxChecker {
     public init() {
     }
 
     public func isBeta() async -> Bool {
-#if !DEBUG
-        do {
-            guard case .verified(let tx) = try await AppTransaction.shared else {
-                return false
-            }
-            return tx.environment == .sandbox
-        } catch {
-            return false
+        await Task.detached {
+            self.verifyBetaBuild()
+        }.value
     }
+}
+
+// MARK: Shared
+
+private extension SandboxChecker {
+
+    // IMPORTANT: check Mac first because os(iOS) holds true for Catalyst
+    func verifyBetaBuild() -> Bool {
+#if os(macOS) || targetEnvironment(macCatalyst)
+        isMacTestFlightBuild
+#elseif os(iOS)
+        isiOSSandboxBuild
 #else
         false
 #endif
     }
+
+    var bundle: Bundle {
+        .main
+    }
 }
+
+// MARK: iOS
+
+#if os(iOS)
+private extension SandboxChecker {
+    var isiOSSandboxBuild: Bool {
+        bundle.appStoreReceiptURL?.lastPathComponent == "sandboxReceipt"
+    }
+}
+#endif
+
+// MARK: macOS
+
+#if os(macOS) || targetEnvironment(macCatalyst)
+private extension SandboxChecker {
+    var isMacTestFlightBuild: Bool {
+        var status = noErr
+
+        var code: SecStaticCode?
+        status = SecStaticCodeCreateWithPath(bundle.bundleURL as CFURL, [], &code)
+        guard status == noErr else {
+            return false
+        }
+        guard let 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 else {
+            return false
+        }
+
+        status = SecStaticCodeCheckValidity(
+            code,
+            [], // default
+            requirement
+        )
+        return status == errSecSuccess
+    }
+}
+#endif