Change puremagic to python-magic (#17)

Author: LsHanaha

pyproject.toml

@@ -22,7 +22,7 @@ dependencies = [
     "pydantic",
     "pyvips",
     "pyvips-binary",
-    "puremagic",
+    "magika",
 ]
 
 [dependency-groups]

safe_s3_storage/file_validator.py

@@ -2,8 +2,8 @@
 import enum
 import typing
 
-import puremagic
 import pyvips  # type: ignore[import-untyped]
+from magika import Magika
 
 from safe_s3_storage import exceptions
 from safe_s3_storage.kaspersky_scan_engine import KasperskyScanEngineClient
@@ -48,16 +48,8 @@ class FileValidator:
     image_quality: int = 85
 
     def _validate_mime_type(self, *, file_name: str, file_content: bytes) -> str:
-        try:
-            mime_type = puremagic.from_string(file_content, mime=True)
-        except puremagic.PureError:
-            # unlike python-magic, puremagic doesn't recognize if text is binary
-            try:
-                file_content.decode()
-            except UnicodeDecodeError:
-                mime_type = "application/octet-stream"
-            else:
-                mime_type = "text/plain"
+        mime_type_prediction: typing.Final = Magika().identify_bytes(file_content)
+        mime_type: typing.Final = mime_type_prediction.prediction.dl.mime_type
         if self.allowed_mime_types is None or mime_type in self.allowed_mime_types:
             return mime_type