Fix thumbnail mime type calculation

ayon_api/server_api.py

@@ -7474,29 +7474,6 @@ def get_workfile_thumbnail(
             project_name, "workfile", workfile_id, thumbnail_id
         )
 
-    def _get_thumbnail_mime_type(self, thumbnail_path):
-        """Get thumbnail mime type on thumbnail creation based on source path.
-
-        Args:
-            thumbnail_path (str): Path to thumbnail source fie.
-
-        Returns:
-            str: Mime type used for thumbnail creation.
-
-        Raises:
-            ValueError: Mime type cannot be determined.
-
-        """
-        ext = os.path.splitext(thumbnail_path)[-1].lower()
-        if ext == ".png":
-            return "image/png"
-
-        elif ext in (".jpeg", ".jpg"):
-            return "image/jpeg"
-
-        raise ValueError(
-            "Thumbnail source file has unknown extensions {}".format(ext))
-
     def create_thumbnail(self, project_name, src_filepath, thumbnail_id=None):
         """Create new thumbnail on server from passed path.
 
@@ -7524,7 +7501,7 @@ def create_thumbnail(self, project_name, src_filepath, thumbnail_id=None):
             )
             return thumbnail_id
 
-        mime_type = self._get_thumbnail_mime_type(src_filepath)
+        mime_type = get_media_mime_type(src_filepath)
         response = self.upload_file(
             "projects/{}/thumbnails".format(project_name),
             src_filepath,
@@ -7552,7 +7529,7 @@ def update_thumbnail(self, project_name, thumbnail_id, src_filepath):
         if not os.path.exists(src_filepath):
             raise ValueError("Entered filepath does not exist.")
 
-        mime_type = self._get_thumbnail_mime_type(src_filepath)
+        mime_type = get_media_mime_type(src_filepath)
         response = self.upload_file(
             "projects/{}/thumbnails/{}".format(project_name, thumbnail_id),
             src_filepath,

ayon_api/utils.py

@@ -767,7 +767,11 @@ def _get_media_mime_type_from_ftyp(content):
     return None
 
 
-def get_media_mime_type_for_content(content: bytes) -> Optional[str]:
+def _get_media_mime_type_for_content_base(content: bytes) -> Optional[str]:
+    """Determine Mime-Type of a file.
+
+    Use header of the file to determine mime type (needs 12 bytes).
+    """
     content_len = len(content)
     # Pre-validation (largest definition check)
     # - hopefully there cannot be media defined in less than 12 bytes
@@ -790,10 +794,6 @@ def get_media_mime_type_for_content(content: bytes) -> Optional[str]:
     if content[0:4] == b"\211PNG":
         return "image/png"
 
-    # SVG
-    if b'xmlns="http://www.w3.org/2000/svg"' in content:
-        return "image/svg+xml"
-
     # JPEG, JFIF or Exif
     if (
         content[0:4] == b"\xff\xd8\xff\xdb"
@@ -820,6 +820,32 @@ def get_media_mime_type_for_content(content: bytes) -> Optional[str]:
     return None
 
 
+def _get_svg_mime_type(content: bytes) -> Optional[str]:
+    # SVG
+    if b'xmlns="http://www.w3.org/2000/svg"' in content:
+        return "image/svg+xml"
+    return None
+
+
+def get_media_mime_type_for_content(content: bytes) -> Optional[str]:
+    mime_type = _get_media_mime_type_for_content_base(content)
+    if mime_type is not None:
+        return mime_type
+    return _get_svg_mime_type(content)
+
+
+def get_media_mime_type_for_stream(stream) -> Optional[str]:
+    # Read only 12 bytes to determine mime type
+    content = stream.read(12)
+    if len(content) < 12:
+        return None
+    mime_type = _get_media_mime_type_for_content_base(content)
+    if mime_type is None:
+        content += stream.read()
+        mime_type = _get_svg_mime_type(content)
+    return mime_type
+
+
 def get_media_mime_type(filepath: str) -> Optional[str]:
     """Determine Mime-Type of a file.
 
@@ -834,9 +860,7 @@ def get_media_mime_type(filepath: str) -> Optional[str]:
         return None
 
     with open(filepath, "rb") as stream:
-        content = stream.read()
-
-    return get_media_mime_type_for_content(content)
+        return get_media_mime_type_for_stream(stream)
 
 
 def take_web_action_event(