Fix notification System

worker/app/notifications/telegram.py

@@ -0,0 +1,69 @@
+"""
+Telegram Bot API – invio messaggi via sendMessage (worker).
+
+Copia del sender backend: i due container sono separati e non
+possono condividere package, quindi il codice e' duplicato.
+"""
+
+import httpx
+
+TELEGRAM_API_BASE = "https://api.telegram.org"
+DEFAULT_TIMEOUT = 10.0
+
+
+class TelegramError(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_message(
+    bot_token: str,
+    chat_id: str,
+    text: str,
+    parse_mode: str = "HTML",
+    disable_web_page_preview: bool = True,
+    timeout: float = DEFAULT_TIMEOUT,
+) -> dict:
+    """
+    Invia un messaggio a un canale/gruppo/utente Telegram.
+
+    Returns:
+        dict con il risultato della API Telegram (result.message_id, ecc.)
+
+    Raises:
+        TelegramError: in caso di errore HTTP o risposta API non-ok
+    """
+    url = f"{TELEGRAM_API_BASE}/bot{bot_token}/sendMessage"
+    payload: dict = {"chat_id": chat_id, "text": text}
+    if parse_mode:
+        payload["parse_mode"] = parse_mode
+    if disable_web_page_preview:
+        payload["link_preview_options"] = {"is_disabled": True}
+
+    async with httpx.AsyncClient(timeout=timeout) as client:
+        try:
+            response = await client.post(url, json=payload)
+        except httpx.TimeoutException as exc:
+            raise TelegramError(f"Timeout Telegram ({timeout}s)") from exc
+        except httpx.RequestError as exc:
+            raise TelegramError(f"Errore di rete Telegram: {exc}") from exc
+
+    if response.status_code != 200:
+        raise TelegramError(
+            f"Telegram API HTTP {response.status_code}: {response.text[:200]}",
+            http_status=response.status_code,
+        )
+
+    data = response.json()
+    if not data.get("ok"):
+        api_code = data.get("error_code")
+        description = data.get("description", "Errore sconosciuto")
+        raise TelegramError(
+            f"Telegram API error {api_code}: {description}",
+            http_status=response.status_code,
+            api_code=api_code,
+        )
+
+    return data.get("result", {})