Island: Rename FieldType to FieldEncryptor

* Switch FieldTypeABC from abstract class to interface, since there's no
  intention of ever implementing FieldTypeABC's methods.

* Rename FieldTypeABC to IFieldEncryptor and rename StringList to
  StringListEncryptor.

monkey/monkey_island/cc/models/utils/field_encryptors/i_field_encryptor.py

@@ -0,0 +1,24 @@
+from abc import ABC, abstractmethod
+from typing import Any
+
+
+class IFieldEncryptor(ABC):
+    @staticmethod
+    @abstractmethod
+    def encrypt(value: Any) -> Any:
+        """Encrypts data and returns the ciphertext.
+
+        :param value: Data that will be encrypted
+        :return: Ciphertext generated by encrypting value
+        :rtype: Any
+        """
+
+    @staticmethod
+    @abstractmethod
+    def decrypt(value: Any):
+        """Decrypts data and returns the plaintext.
+
+        :param value: Ciphertext that will be decrypted
+        :return: Plaintext generated by decrypting value
+        :rtype: Any
+        """

monkey/monkey_island/cc/models/utils/field_encryptors/string_list_encryptor.py

@@ -1,10 +1,10 @@
 from typing import List
 
-from monkey_island.cc.models.utils.field_types.field_type_abc import FieldTypeABC
+from monkey_island.cc.models.utils.field_encryptors.i_field_encryptor import IFieldEncryptor
 from monkey_island.cc.server_utils.encryption import string_encryptor
 
 
-class StringList(FieldTypeABC):
+class StringListEncryptor(IFieldEncryptor):
     @staticmethod
     def encrypt(value: List[str]):
         return [string_encryptor.encrypt(string) for string in value]

monkey/monkey_island/cc/models/utils/field_types/field_type_abc.py

@@ -1,14 +0,0 @@
-from abc import ABC, abstractmethod
-from typing import Any
-
-
-class FieldTypeABC(ABC):
-    @staticmethod
-    @abstractmethod
-    def encrypt(value: Any):
-        raise NotImplementedError()
-
-    @staticmethod
-    @abstractmethod
-    def decrypt(value: Any):
-        raise NotImplementedError()

monkey/monkey_island/cc/models/utils/report_encryptor.py

@@ -3,18 +3,20 @@ from typing import Callable, Type
 
 import dpath.util
 
-from monkey_island.cc.models.utils.field_types.field_type_abc import FieldTypeABC
+from monkey_island.cc.models.utils.field_encryptors.i_field_encryptor import IFieldEncryptor
-from monkey_island.cc.models.utils.field_types.string_list import StringList
+from monkey_island.cc.models.utils.field_encryptors.string_list_encryptor import StringListEncryptor
 
 
 @dataclass
 class SensitiveField:
     path: str
     path_separator = "."
-    field_type: Type[FieldTypeABC]
+    field_type: Type[IFieldEncryptor]
 
 
-sensitive_fields = [SensitiveField(path="overview.config_passwords", field_type=StringList)]
+sensitive_fields = [
+    SensitiveField(path="overview.config_passwords", field_type=StringListEncryptor)
+]
 
 
 def encrypt(report: dict) -> dict:

monkey/tests/unit_tests/monkey_island/cc/models/test_report_model.py

@@ -1,7 +1,7 @@
 import pytest
 
 from monkey_island.cc.models import Report
-from monkey_island.cc.models.utils.field_types.string_list import StringList
+from monkey_island.cc.models.utils.field_encryptors.string_list_encryptor import StringListEncryptor
 from monkey_island.cc.models.utils.report_encryptor import SensitiveField
 from monkey_island.cc.server_utils.encryptor import initialize_encryptor
 
@@ -13,7 +13,7 @@ MOCK_REPORT_DICT = {
     "meta_info": {"foo": "bar"},
 }
 
-MOCK_SENSITIVE_FIELDS = [SensitiveField("overview.foo.the_key", StringList)]
+MOCK_SENSITIVE_FIELDS = [SensitiveField("overview.foo.the_key", StringListEncryptor)]
 
 
 @pytest.mark.usefixtures("uses_database")