extractEncryptedResponse function

Encryptionextraction extractEncryptedResponse(Map<String, dynamic> response, { String topLevelKey = 'en', String dataKeyName = 'encryptedKey', bool hasTopLevelKey = true, String separator = '\$aA', })

Extracts encrypted components from a server response.

This function processes a response map and extracts the encrypted key, encrypted data, and initialization vector (IV) from the specified key.

• response: The response map to extract data from.
• topLevelKey: The top-level key in the response containing encrypted data (default is 'en').
• dataKeyName: The key name for the encrypted key inside the top-level key (default is 'encryptedKey').
• hasTopLevelKey: Specifies if the encrypted data is nested under a top-level key (default is true).
• separator: The separator used to split the encrypted key into parts (default is '$aA').

Returns an Encryptionextraction object containing the extracted components.

Throws:

• FormatException: If the response structure is invalid, keys are missing, or the encryptedKey format is incorrect.
• Exception: For other unexpected errors during extraction.

Implementation

Encryptionextraction extractEncryptedResponse(
  Map<String, dynamic> response, {
  String topLevelKey = 'en',
  String dataKeyName = 'encryptedKey',
  bool hasTopLevelKey = true,
  String separator = '\$aA',
}) {
  try {
    String? ek;
    if (hasTopLevelKey) {
      if (response[topLevelKey] is! Map ||
          response[topLevelKey][dataKeyName] == null) {
        throw FormatException(
            "Invalid response: '$topLevelKey' or '$dataKeyName' key not found.");
      }
      ek = response[topLevelKey][dataKeyName] as String?;
    } else {
      ek = response[dataKeyName] as String?;
    }

    if (ek == null || ek.isEmpty) {
      throw FormatException(
          "Invalid response: '$dataKeyName' is missing or empty.");
    }

    final parts = ek.split(separator);
    if (parts.length != 3) {
      throw FormatException(
          "Invalid encryptedKey format. Expected 3 parts separated by '$separator', but got ${parts.length} parts.");
    }

    return Encryptionextraction(
      encryptedKey: parts[0],
      encryptedData: parts[1],
      iv: parts[2],
    );
  } catch (e) {
    throw Exception("Failed to extract encryption data: $e");
  }
}