feat(whatsapp): add dm_policy and group_policy parity with WeCom/Weixin/QQ adapters

Add dm_policy and group_policy to the WhatsApp adapter, bringing parity
with WeCom/Weixin/QQ. Allows independent control of DM and group access:
disable DMs entirely, allowlist specific senders/groups, or keep open.

- dm_policy: open (default) | allowlist | disabled
- group_policy: open (default) | allowlist | disabled
- Config bridging for YAML → env vars
- 22 tests covering all policy combinations

Backward compatible — defaults preserve existing behavior.

Cherry-picked from PR #11597 by @MassiveMassimo.
Dropped the run.py group auth bypass (would have skipped user auth
for ALL platforms, not just WhatsApp).

gateway/config.py

@@ -576,6 +576,14 @@ def load_gateway_config() -> GatewayConfig:
                     bridged["free_response_channels"] = platform_cfg["free_response_channels"]
                 if "mention_patterns" in platform_cfg:
                     bridged["mention_patterns"] = platform_cfg["mention_patterns"]
+                if "dm_policy" in platform_cfg:
+                    bridged["dm_policy"] = platform_cfg["dm_policy"]
+                if "allow_from" in platform_cfg:
+                    bridged["allow_from"] = platform_cfg["allow_from"]
+                if "group_policy" in platform_cfg:
+                    bridged["group_policy"] = platform_cfg["group_policy"]
+                if "group_allow_from" in platform_cfg:
+                    bridged["group_allow_from"] = platform_cfg["group_allow_from"]
                 if plat == Platform.DISCORD and "channel_skill_bindings" in platform_cfg:
                     bridged["channel_skill_bindings"] = platform_cfg["channel_skill_bindings"]
                 if "channel_prompts" in platform_cfg:
@@ -700,6 +708,20 @@ def load_gateway_config() -> GatewayConfig:
                     if isinstance(frc, list):
                         frc = ",".join(str(v) for v in frc)
                     os.environ["WHATSAPP_FREE_RESPONSE_CHATS"] = str(frc)
+                if "dm_policy" in whatsapp_cfg and not os.getenv("WHATSAPP_DM_POLICY"):
+                    os.environ["WHATSAPP_DM_POLICY"] = str(whatsapp_cfg["dm_policy"]).lower()
+                af = whatsapp_cfg.get("allow_from")
+                if af is not None and not os.getenv("WHATSAPP_ALLOWED_USERS"):
+                    if isinstance(af, list):
+                        af = ",".join(str(v) for v in af)
+                    os.environ["WHATSAPP_ALLOWED_USERS"] = str(af)
+                if "group_policy" in whatsapp_cfg and not os.getenv("WHATSAPP_GROUP_POLICY"):
+                    os.environ["WHATSAPP_GROUP_POLICY"] = str(whatsapp_cfg["group_policy"]).lower()
+                gaf = whatsapp_cfg.get("group_allow_from")
+                if gaf is not None and not os.getenv("WHATSAPP_GROUP_ALLOWED_USERS"):
+                    if isinstance(gaf, list):
+                        gaf = ",".join(str(v) for v in gaf)
+                    os.environ["WHATSAPP_GROUP_ALLOWED_USERS"] = str(gaf)
 
             # DingTalk settings → env vars (env vars take precedence)
             dingtalk_cfg = yaml_cfg.get("dingtalk", {})

gateway/platforms/whatsapp.py

@@ -118,6 +118,10 @@ class WhatsAppAdapter(BasePlatformAdapter):
     - bridge_script: Path to the Node.js bridge script
     - bridge_port: Port for HTTP communication (default: 3000)
     - session_path: Path to store WhatsApp session data
+    - dm_policy: "open" | "allowlist" | "disabled" — how DMs are handled (default: "open")
+    - allow_from: List of sender IDs allowed in DMs (when dm_policy="allowlist")
+    - group_policy: "open" | "allowlist" | "disabled" — which groups are processed (default: "open")
+    - group_allow_from: List of group JIDs allowed (when group_policy="allowlist")
     """
     
     # WhatsApp message limits — practical UX limit, not protocol max.
@@ -140,6 +144,10 @@ class WhatsAppAdapter(BasePlatformAdapter):
             get_hermes_dir("platforms/whatsapp/session", "whatsapp/session")
         ))
         self._reply_prefix: Optional[str] = config.extra.get("reply_prefix")
+        self._dm_policy = str(config.extra.get("dm_policy") or os.getenv("WHATSAPP_DM_POLICY", "open")).strip().lower()
+        self._allow_from = self._coerce_allow_list(config.extra.get("allow_from") or config.extra.get("allowFrom"))
+        self._group_policy = str(config.extra.get("group_policy") or os.getenv("WHATSAPP_GROUP_POLICY", "open")).strip().lower()
+        self._group_allow_from = self._coerce_allow_list(config.extra.get("group_allow_from") or config.extra.get("groupAllowFrom"))
         self._mention_patterns = self._compile_mention_patterns()
         self._message_queue: asyncio.Queue = asyncio.Queue()
         self._bridge_log_fh = None
@@ -163,6 +171,33 @@ class WhatsAppAdapter(BasePlatformAdapter):
             return {str(part).strip() for part in raw if str(part).strip()}
         return {part.strip() for part in str(raw).split(",") if part.strip()}
 
+    @staticmethod
+    def _coerce_allow_list(raw) -> set[str]:
+        """Parse allow_from / group_allow_from from config or env var."""
+        if raw is None:
+            return set()
+        if isinstance(raw, list):
+            return {str(part).strip() for part in raw if str(part).strip()}
+        return {part.strip() for part in str(raw).split(",") if part.strip()}
+
+    def _is_dm_allowed(self, sender_id: str) -> bool:
+        """Check whether a DM from the given sender should be processed."""
+        if self._dm_policy == "disabled":
+            return False
+        if self._dm_policy == "allowlist":
+            return sender_id in self._allow_from
+        # "open" — all DMs allowed
+        return True
+
+    def _is_group_allowed(self, chat_id: str) -> bool:
+        """Check whether a group chat should be processed."""
+        if self._group_policy == "disabled":
+            return False
+        if self._group_policy == "allowlist":
+            return chat_id in self._group_allow_from
+        # "open" — all groups allowed
+        return True
+
     def _compile_mention_patterns(self):
         patterns = self.config.extra.get("mention_patterns")
         if patterns is None:
@@ -255,8 +290,18 @@ class WhatsAppAdapter(BasePlatformAdapter):
         return cleaned.strip() or text
 
     def _should_process_message(self, data: Dict[str, Any]) -> bool:
-        if not data.get("isGroup"):
+        is_group = data.get("isGroup", False)
+        if is_group:
+            chat_id = str(data.get("chatId") or "")
+            if not self._is_group_allowed(chat_id):
+                return False
+        else:
+            sender_id = str(data.get("senderId") or data.get("from") or "")
+            if not self._is_dm_allowed(sender_id):
+                return False
+            # DMs that pass the policy gate are always processed
             return True
+        # Group messages: check mention / free-response settings
         chat_id = str(data.get("chatId") or "")
         if chat_id in self._whatsapp_free_response_chats():
             return True