add sha256

Author: n1nj4t4nuk1

pyvalueobjects/security/nullable_sha256_hash.py

@@ -0,0 +1,10 @@
+from pyvalueobjects.abstract.nullablevalueobject import build_nullable
+from pyvalueobjects.security.sha256_hash import Sha256Hash
+
+_nullable_cls = build_nullable(Sha256Hash)
+
+
+class NullableSha256Hash(_nullable_cls):
+
+    def __init__(self, value: str = None):
+        super().__init__(value) 

pyvalueobjects/security/sha256_hash.py

@@ -0,0 +1,21 @@
+import re
+
+from pyvalueobjects.errors.ValueObjectError import ValueObjectError
+from pyvalueobjects.strings.non_empty_string import NonEmptyString
+
+
+class Sha256Hash(NonEmptyString):
+
+    __MATCHER = re.compile(r'^[a-fA-F0-9]{64}$')
+
+    def __init__(self, value: str):
+        super().__init__(value)
+
+    def _validate(self, value: str):
+        super()._validate(value)
+        try:
+            is_correct = Sha256Hash.__MATCHER.match(value)
+            if not is_correct:
+                raise ValueObjectError('Value must be a valid SHA256 hash (64 hexadecimal characters).')
+        except ValueError:
+            raise ValueObjectError('Value must be a valid SHA256 hash (64 hexadecimal characters).')