tool: Implement ios migrate tool ref dev-1953

migratetool/ios/Classes/MigratetoolPlugin.swift

@@ -2,6 +2,24 @@ import Flutter
 import UIKit
 
 public class MigratetoolPlugin: NSObject, FlutterPlugin {
+  private static keyRefreshToken: String = "refresh_token"
+  private static keyAnonymousId: String = "anonymousId"
+  private static keyBiometricKeyId: String = "biometricKeyId"
+  private static partialKeys: String[] = [keyRefreshToken, keyAnonymousId, keyBiometricKeyId];
+  class KeyMaker {
+    func scopedKey(key: String) -> String {
+      return "authgear_\(key)"
+    }
+    func keyRefreshToken(namespace: String) -> String {
+      return scopedKey("\(namespace)_refreshToken")
+    }
+    func keyAnonymousKeyId(namespace: String) -> String {
+      return scopedKey("\(namespace)_anonymousKeyID")
+    }
+    func keyBiometricKeyId(namespace: String) -> String {
+      return scopedKey("\(namespace)_biometricKeyID")
+    }
+  }
   public static func register(with registrar: FlutterPluginRegistrar) {
     let channel = FlutterMethodChannel(name: "migratetool", binaryMessenger: registrar.messenger())
     let instance = MigratetoolPlugin()
@@ -10,10 +28,117 @@ public class MigratetoolPlugin: NSObject, FlutterPlugin {
 
   public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
     switch call.method {
-    case "getPlatformVersion":
-      result("iOS " + UIDevice.current.systemVersion)
+    case "hasFlutterData":
+      result(hasFlutterData())
     default:
       result(FlutterMethodNotImplemented)
     }
   }
+
+  private func hasFlutterData(containerName: String) -> Bool {
+    let keyMaker = KeyMaker()
+    let hasRefreshToken = storageGetItem(keyMaker.keyRefreshToken(containerName)) != nil
+    let hasAnonymousKeyId = storageGetItem(keyMaker.keyAnonymousKeyId(containerName)) != nil
+    let hasBiometricKeyId = storageGetItem(keyMaker.keyBiometricKeyId(containerName)) != nil
+    return hasRefreshToken || hasAnonymousKeyId || hasBiometricKeyId
+  }
+
+  private func xamarinFullKey(containerName: String, subKey: String) -> String {
+    return "\(containerName)_\(subKey)"
+  }
+
+  private func xamarinEssentialAlias(packageName: String) -> String {
+    return "\(packageName)_xamarinessentials"
+  }
+
+  private func hasXamarinData(packageName: String, containerName: String) -> Bool {
+    let alias = xamarinEssentialAlias(packageName)
+    for subKey in partialKeys {
+      let fullKey = xamarinFullKey(containerName, subKey)
+      let value = storageGetItem(fullKey, alias)
+      if value != nil {
+        return true
+      }
+    }
+    return false
+  }
+
+  private func migrate(packageName: String, containerName: String) -> Bool {
+    let alias = xamarinEssentialAlias(packageName)
+    let refreshToken = storageGetItem(xamarinFullKey(containerName, keyRefreshToken))
+    let anonymousId = storageGetItem(xamarinFullKey(containerName, keyAnonymousId))
+    let biometricKeyId = storageGetItem(xamarinFullKey(containerName, keyBiometricKeyId))
+    let keyMaker = KeyMaker()
+    if refreshToken != nil {
+      storageSetItem(keyMaker.keyRefreshToken(containerName), refreshToken)
+    }
+    if anonymousId != nil {
+      storageSetItem(keyMaker.keyAnonymousKeyId(containerName), anonymousId)
+    }
+    if biometricKeyId != nil {
+      storageSetItem(keyMaker.keyBiometricKeyId(containerName), biometricKeyId)
+    }
+    return false
+  }
+
+  // Direct copy of https://github.com/authgear/authgear-sdk-flutter/blob/main/ios/Classes/SwiftAuthgearPlugin.swift#L389
+  private func storageSetItem(key: String, value: String, result: FlutterResult) {
+    let data = value.data(using: .utf8)!
+    let updateQuery: [String: Any] = [
+      kSecClass as String: kSecClassGenericPassword,
+      kSecAttrAccount as String: key,
+    ]
+    let update: [String: Any] = [
+      kSecValueData as String: data,
+    ]
+
+    let updateStatus = SecItemUpdate(updateQuery as CFDictionary, update as CFDictionary)
+    switch updateStatus {
+    case errSecSuccess:
+      result(nil)
+    default:
+      let addQuery: [String: Any] = [
+        kSecClass as String: kSecClassGenericPassword,
+        kSecAttrAccount as String: key,
+        kSecValueData as String: data,
+      ]
+
+      let addStatus = SecItemAdd(addQuery as CFDictionary, nil)
+      switch addStatus {
+      case errSecSuccess:
+        result(nil)
+      default:
+        result(FlutterError(status: addStatus))
+      }
+    }
+  }
+
+
+  // Direct copy of https://github.com/authgear/authgear-sdk-flutter/blob/main/ios/Classes/SwiftAuthgearPlugin.swift#L420C3-L442C4
+  private func storageGetItem(key: String, service: String? = nil) -> String? {
+    let query: [String: Any] = [
+      kSecClass as String: kSecClassGenericPassword,
+      kSecAttrAccount as String: key,
+      kSecMatchLimit as String: kSecMatchLimitOne,
+      kSecReturnData as String: true,
+    ]
+    if service != nil {
+      query[kSecAttrService as String] = service
+    }
+
+    var item: CFTypeRef?
+    let status = withUnsafeMutablePointer(to: &item) {
+      SecItemCopyMatching(query as CFDictionary, $0)
+    }
+
+    switch status {
+    case errSecSuccess:
+      let value = String(data: item as! Data, encoding: .utf8)
+      return value
+    case errSecItemNotFound:
+      return nil
+    default:
+      return nil
+    }
+  }
 }