Fix notification System

worker/app/notifications/whatsapp.py

@@ -0,0 +1,73 @@
+"""
+WhatsApp sender (worker) – Meta Cloud API v18.
+
+Copia del sender backend: i due container sono separati.
+"""
+
+import httpx
+
+META_GRAPH_API_URL = "https://graph.facebook.com/v18.0"
+DEFAULT_TIMEOUT = 10.0
+
+
+class WhatsAppError(Exception):
+    def __init__(self, message: str, http_status: int | None = None, api_code: int | None = None):
+        super().__init__(message)
+        self.http_status = http_status
+        self.api_code = api_code
+
+
+async def send_whatsapp_message(
+    phone_number_id: str,
+    to_phone: str,
+    text: str,
+    access_token: str,
+    timeout: float = DEFAULT_TIMEOUT,
+) -> dict:
+    """
+    Invia un messaggio di testo WhatsApp via Meta Cloud API.
+
+    Raises:
+        WhatsAppError: in caso di errore HTTP o risposta API non-ok
+    """
+    url = f"{META_GRAPH_API_URL}/{phone_number_id}/messages"
+    payload = {
+        "messaging_product": "whatsapp",
+        "to": to_phone.replace(" ", "").replace("-", ""),
+        "type": "text",
+        "text": {"body": text},
+    }
+    headers = {
+        "Authorization": f"Bearer {access_token}",
+        "Content-Type": "application/json",
+    }
+
+    async with httpx.AsyncClient(timeout=timeout) as client:
+        try:
+            response = await client.post(url, json=payload, headers=headers)
+        except httpx.TimeoutException as exc:
+            raise WhatsAppError(f"Timeout WhatsApp API dopo {timeout}s") from exc
+        except httpx.RequestError as exc:
+            raise WhatsAppError(f"Errore di rete WhatsApp: {exc}") from exc
+
+    if response.status_code == 401:
+        raise WhatsAppError("Token Meta non valido o scaduto", http_status=401)
+
+    if response.status_code >= 400:
+        try:
+            err_data = response.json()
+            err_msg = err_data.get("error", {}).get("message", response.text[:200])
+            err_code = err_data.get("error", {}).get("code")
+        except Exception:
+            err_msg = response.text[:200]
+            err_code = None
+        raise WhatsAppError(
+            f"Meta API errore HTTP {response.status_code}: {err_msg}",
+            http_status=response.status_code,
+            api_code=err_code,
+        )
+
+    data = response.json()
+    messages = data.get("messages", [])
+    message_id = messages[0].get("id") if messages else None
+    return {"message_id": message_id, "http_status": response.status_code}