From 28a07e4fdda96e9c7c0dfed029a6cb15de15f8b7 Mon Sep 17 00:00:00 2001
From: Ilija Lazoroski <ilija.la@live.com>
Date: Tue, 7 Jun 2022 19:48:03 +0200
Subject: [PATCH] Common: Add get_binary_io_sha256_hash function

---
 monkey/common/utils/file_utils.py             | 28 +++++++++++++++----
 .../common/utils/test_common_file_utils.py    |  7 +++++
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/monkey/common/utils/file_utils.py b/monkey/common/utils/file_utils.py
index c9cb78139..a0f09d9ad 100644
--- a/monkey/common/utils/file_utils.py
+++ b/monkey/common/utils/file_utils.py
@@ -1,7 +1,9 @@
 import hashlib
 import os
 from pathlib import Path
-from typing import Iterable
+from typing import BinaryIO, Iterable
+
+MAX_BLOCK_SIZE = 65536
 
 
 class InvalidPath(Exception):
@@ -15,11 +17,27 @@ def expand_path(path: str) -> Path:
     return Path(os.path.expandvars(os.path.expanduser(path)))
 
 
-def get_file_sha256_hash(filepath: Path):
-    sha256 = hashlib.sha256()
+def get_file_sha256_hash(filepath: Path) -> str:
+    """
+    Calculates sha256 hash from a file path
+
+    :param filepath: A Path object which defines file on the system
+    :return sha256 hash of the file
+    """
     with open(filepath, "rb") as f:
-        for block in iter(lambda: f.read(65536), b""):
-            sha256.update(block)
+        return get_binary_io_sha256_hash(f)
+
+
+def get_binary_io_sha256_hash(binary: BinaryIO) -> str:
+    """
+    Calculates sha256 hash from a file-like object
+
+    :param binary: file-like object from which we calculate the hash
+    :return: sha256 hash from the file-like object
+    """
+    sha256 = hashlib.sha256()
+    for block in iter(lambda: binary.read(MAX_BLOCK_SIZE), b""):
+        sha256.update(block)
 
     return sha256.hexdigest()
 
diff --git a/monkey/tests/unit_tests/common/utils/test_common_file_utils.py b/monkey/tests/unit_tests/common/utils/test_common_file_utils.py
index aac13839e..5b449b01c 100644
--- a/monkey/tests/unit_tests/common/utils/test_common_file_utils.py
+++ b/monkey/tests/unit_tests/common/utils/test_common_file_utils.py
@@ -1,4 +1,5 @@
 import os
+from io import BytesIO
 
 import pytest
 from tests.utils import add_files_to_dir, add_subdirs_to_dir
@@ -7,6 +8,7 @@ from common.utils.file_utils import (
     InvalidPath,
     expand_path,
     get_all_regular_files_in_directory,
+    get_binary_io_sha256_hash,
     get_file_sha256_hash,
 )
 
@@ -34,6 +36,11 @@ def test_get_file_sha256_hash(stable_file, stable_file_sha256_hash):
     assert get_file_sha256_hash(stable_file) == stable_file_sha256_hash
 
 
+def test_get_binary_sha256_hash():
+    expected_hash = "a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e"
+    assert get_binary_io_sha256_hash(BytesIO(b"Hello World")) == expected_hash
+
+
 SUBDIRS = ["subdir1", "subdir2"]
 FILES = ["file.jpg.zip", "file.xyz", "1.tar", "2.tgz", "2.png", "2.mpg"]