From 2b75c8f0362797ccd2964f4137814279e29cf056 Mon Sep 17 00:00:00 2001
From: axolotle <nchesnais@mailoo.org>
Date: Fri, 17 Nov 2023 17:28:25 +0100
Subject: [PATCH] form:FileOption: add file "accept"  validation handling

---
 src/utils/form.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/utils/form.py b/src/utils/form.py
index 25c985a90..54370488d 100644
--- a/src/utils/form.py
+++ b/src/utils/form.py
@@ -1272,7 +1272,7 @@ class FileOption(BaseInputOption):
     type: Literal[OptionType.file] = OptionType.file
     # `FilePath` for CLI (path must exists and must be a file)
     # `bytes` for API (a base64 encoded file actually)
-    accept: Union[str, None] = ""  # currently only used by the web-admin
+    accept: Union[list[str], None] = None  # currently only used by the web-admin
     default: Union[str, None]
     _annotation = str  # TODO could be Path at some point
     _upload_dirs: set[str] = set()
@@ -1291,6 +1291,9 @@ class FileOption(BaseInputOption):
     def _get_field_attrs(self) -> dict[str, Any]:
         attrs = super()._get_field_attrs()
 
+        if self.accept:
+            attrs["accept"] = self.accept  # extra
+
         attrs["bind"] = self.bind
 
         return attrs
@@ -1317,8 +1320,14 @@ class FileOption(BaseInputOption):
         else:
             content = b64decode(value)
 
+        accept_list = field.field_info.extra.get("accept")
         mimetype = Magic(mime=True).from_buffer(content)
 
+        if accept_list and mimetype not in accept_list:
+            raise YunohostValidationError(
+                f"Unsupported image type : {mimetype}", raw=True
+            )
+
         ext = mimetypes.guess_extension(mimetype)
 
         return content, ext