feat: file mobile issues without an owner (Closes #855)

src/gitea_proxy.py

@@ -1469,12 +1469,14 @@ async def create_issue(
     repository: str,
     title: str,
     body: str,
-    assignee: str,
+    assignee: str | None,
     label_ids: list[int] | None = None,
     milestone_id: int | None = None,
     due_date: str | None = None,
 ) -> dict:
-    payload: dict = {"title": title, "body": body, "assignee": assignee}
+    payload: dict = {"title": title, "body": body}
+    if assignee is not None:
+        payload["assignee"] = assignee
     if label_ids:
         payload["labels"] = label_ids
     if milestone_id is not None:
@@ -1497,7 +1499,8 @@ async def create_issue(
         for item in assignees
         if isinstance(item, dict) and isinstance(item.get("login"), str)
     ]
-    if confirmed_assignees != [assignee]:
+    expected_assignees = [assignee] if assignee is not None else []
+    if confirmed_assignees != expected_assignees:
         raise ValueError(
             "Gitea did not confirm self-assignment or exact issue assignment"
         )

src/main.py

@@ -742,6 +742,7 @@ def _validate_binary_attachment(filename: str, content_type: str, content: bytes
 class IssueCreation(BaseModel):
     title: str = Field(min_length=1, max_length=255)
     body: str = Field(default="", max_length=10_000)
+    unassigned: bool = False
     assignee: str | None = Field(
         default=None, pattern=r"^[A-Za-z0-9_.-]+$", max_length=255
     )
@@ -766,6 +767,12 @@ class IssueCreation(BaseModel):
     def strip_issue_body(cls, value: str) -> str:
         return value.strip()
 
+    @model_validator(mode="after")
+    def require_one_owner_intent(self):
+        if self.unassigned and self.assignee is not None:
+            raise ValueError("assignee and unassigned cannot be requested together")
+        return self
+
     @field_validator("due_date")
     @classmethod
     def validate_due_date(cls, value: str | None) -> str | None:
@@ -4717,8 +4724,8 @@ async def create_assigned_issue(
         login = user.get("login") if isinstance(user, dict) else None
         if not login or accessible is None:
             raise HTTPException(status_code=404, detail="Repository not found")
-        assignee = login
-        if creation.assignee and creation.assignee != login:
+        assignee = None if creation.unassigned else login
+        if not creation.unassigned and creation.assignee and creation.assignee != login:
             eligible = {
                 item["login"]
                 for item in await gitea_proxy.issue_handoff_candidates(repository)
@@ -4772,6 +4779,7 @@ async def create_assigned_issue(
                 creation.title,
                 creation.body,
                 creation.assignee,
+                creation.unassigned,
                 tuple(creation.label_ids),
                 creation.milestone_id,
                 creation.due_date,