Move some utility functions to a separated python file

Whatsapp_Chat_Exporter/utility.py

@@ -0,0 +1,44 @@
+from bleach import clean as sanitize
+from markupsafe import Markup
+from datetime import datetime
+from enum import Enum
+
+
+def sanitize_except(html):
+    return Markup(sanitize(html, tags=["br"]))
+
+
+def determine_day(last, current):
+    last = datetime.fromtimestamp(last).date()
+    current = datetime.fromtimestamp(current).date()
+    if last == current:
+        return None
+    else:
+        return current
+
+
+# Android Specific
+
+CRYPT14_OFFSETS = (
+    {"iv": 67, "db": 191},
+    {"iv": 67, "db": 190},
+    {"iv": 66, "db": 99},
+    {"iv": 67, "db": 193}
+)
+
+
+class Crypt(Enum):
+    CRYPT15 = 15
+    CRYPT14 = 14
+    CRYPT12 = 12
+
+
+def brute_force_offset(max_iv=200, max_db=200):
+    for iv in range(0, max_iv):
+        for db in range(0, max_db):
+            yield iv, iv + 16, db
+
+
+# iOS Specific
+
+APPLE_TIME = datetime.timestamp(datetime(2001, 1, 1))