feat: create message capture policies

backend/src/utils/policy/resolver.py

@@ -0,0 +1,46 @@
+from collections.abc import Iterable
+
+from utils.policy.models import (
+    CaptureToggles,
+    ChatKind,
+    ChatMeta,
+    FolderSpec,
+    PolicySet,
+)
+
+
+def _category_match(folder: FolderSpec, chat: ChatMeta) -> bool:
+    if chat.kind is ChatKind.GROUP:
+        return folder.groups
+    if chat.kind is ChatKind.CHANNEL:
+        return folder.broadcasts
+    if chat.is_bot:
+        return folder.bots
+    if chat.is_contact is True:
+        return folder.contacts
+    if chat.is_contact is False:
+        return folder.non_contacts
+    return False
+
+
+def folder_contains(folder: FolderSpec, chat: ChatMeta) -> bool:
+    if chat.chat_id in folder.exclude_ids:
+        return False
+    if chat.chat_id in folder.include_ids or chat.chat_id in folder.pinned_ids:
+        return True
+    if folder.is_chatlist:
+        return False
+    return _category_match(folder, chat)
+
+
+def resolve(
+    chat: ChatMeta, folders: Iterable[FolderSpec], policies: PolicySet
+) -> CaptureToggles:
+    chat_override = policies.chat.get(chat.chat_id)
+    if chat_override is not None:
+        return chat_override
+    for folder in sorted(folders, key=lambda f: f.order_index):
+        toggles = policies.folder.get(folder.folder_id)
+        if toggles is not None and folder_contains(folder, chat):
+            return toggles
+    return policies.defaults.get(chat.kind, CaptureToggles())