Method Parse

cpp/src/parquet/encryption/key_metadata.cc:38–70

    : is_internal_storage_(true), key_material_or_reference_(key_material) {}

KeyMetadata KeyMetadata::Parse(const std::string& key_metadata) {
  ObjectParser json_parser;
  ::arrow::Status status = json_parser.Parse(key_metadata);
  if (!status.ok()) {
    throw ParquetException("Failed to parse key metadata " + key_metadata);
  }

  // 1. Extract "key material type", and make sure it is supported
  std::string key_material_type;
  PARQUET_ASSIGN_OR_THROW(key_material_type,
                          json_parser.GetString(KeyMaterial::kKeyMaterialTypeField));
  if (key_material_type != KeyMaterial::kKeyMaterialType1) {
    throw ParquetException("Wrong key material type: " + key_material_type + " vs " +
                           KeyMaterial::kKeyMaterialType1);
  }

  // 2. Check if "key material" is stored internally in Parquet file key metadata, or is
  // stored externally
  bool is_internal_storage;
  PARQUET_ASSIGN_OR_THROW(is_internal_storage,
                          json_parser.GetBool(kKeyMaterialInternalStorageField));

  if (is_internal_storage) {
    // 3.1 "key material" is stored internally, inside "key metadata" - parse it
    KeyMaterial key_material = KeyMaterial::Parse(&json_parser);
    return KeyMetadata(key_material);
  } else {
    // 3.2 "key material" is stored externally. "key metadata" keeps a reference to it
    std::string key_reference;
    PARQUET_ASSIGN_OR_THROW(key_reference, json_parser.GetString(kKeyReferenceField));
    return KeyMetadata(key_reference);
  }
}

// For external material only. For internal material, create serialized KeyMaterial
// directly