Common: Add get_file_sha256_hash()

.gitattributes

@@ -1 +1,2 @@
 monkey/tests/data_for_tests/ransomware_targets/** -text
+monkey/tests/data_for_tests/stable_file.txt -text

monkey/common/utils/file_utils.py

@@ -1,3 +1,4 @@
+import hashlib
 import os
 from pathlib import Path
 
@@ -11,3 +12,12 @@ def expand_path(path: str) -> Path:
         raise InvalidPath("Empty path provided")
 
     return Path(os.path.expandvars(os.path.expanduser(path)))
+
+
+def get_file_sha256_hash(filepath: Path):
+    sha256 = hashlib.sha256()
+    with open(filepath, "rb") as f:
+        for block in iter(lambda: f.read(65536), b""):
+            sha256.update(block)
+
+    return sha256.hexdigest()

monkey/tests/conftest.py

@@ -11,3 +11,13 @@
 @pytest.fixture(scope="session")
 def data_for_tests_dir(pytestconfig):
     return Path(os.path.join(pytestconfig.rootdir, "monkey", "tests", "data_for_tests"))
+
+
+@pytest.fixture(scope="session")
+def stable_file(data_for_tests_dir) -> Path:
+    return data_for_tests_dir / "stable_file.txt"
+
+
+@pytest.fixture(scope="session")
+def stable_file_sha256_hash() -> str:
+    return "d9dcaadc91261692dafa86e7275b1bf39bb7e19d2efcfacd6fe2bfc9a1ae1062"

monkey/tests/data_for_tests/stable_file.txt

@@ -0,0 +1 @@
+Don't change me!

monkey/tests/unit_tests/common/utils/test_common_file_utils.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from common.utils.file_utils import InvalidPath, expand_path
+from common.utils.file_utils import InvalidPath, expand_path, get_file_sha256_hash
 
 
 def test_expand_user(patched_home_env):
@@ -22,3 +22,7 @@ def test_expand_vars(patched_home_env):
 def test_expand_path__empty_path_provided():
     with pytest.raises(InvalidPath):
         expand_path("")
+
+
+def test_get_file_sha256_hash(stable_file, stable_file_sha256_hash):
+    assert get_file_sha256_hash(stable_file) == stable_file_sha256_hash