refactor(signal): use native signal-cli service

python/signal_alert.py

@@ -2,23 +2,19 @@
 
 from __future__ import annotations
 
+import json
 import logging
+import socket
 from os import getenv
 
-import httpx
-
 logger = logging.getLogger(__name__)
 
-SIGNAL_API_URL = "http://localhost:8989/v2/send"
-SIGNAL_API_TIMEOUT = 4.0
 
-
-def signal_alert(body: str, title: str = "") -> None:
+def signal_alert(body: str) -> None:
     """Send a signal alert.
 
     Args:
         body (str): The body of the alert.
-        title (str, optional): The title of the alert. Defaults to "".
     """
     from_phone = getenv("SIGNAL_ALERT_FROM_PHONE")
     to_phone = getenv("SIGNAL_ALERT_TO_PHONE")
@@ -26,25 +22,35 @@ def signal_alert(body: str, title: str = "") -> None:
         logger.info("SIGNAL_ALERT_FROM_PHONE or SIGNAL_ALERT_TO_PHONE not set")
         return
 
-    # Apprise's Signal integration did not support titles, so preserve that behavior.
-    if title:
-        logger.debug("Signal does not support notification titles; ignoring title")
+    signal_rpc_id = "signal-alert"
+    request = {
+        "jsonrpc": "2.0",
+        "method": "send",
+        "params": {
+            "account": from_phone,
+            "recipient": [to_phone],
+            "message": body,
+        },
+        "id": signal_rpc_id,
+    }
 
     try:
-        response = httpx.post(
-            SIGNAL_API_URL,
-            json={
-                "message": body,
-                "number": from_phone,
-                "recipients": [to_phone],
-                "text_mode": "normal",
-            },
-            timeout=SIGNAL_API_TIMEOUT,
-            follow_redirects=True,
-        )
-    except httpx.HTTPError:
-        logger.exception("Unable to contact the Signal API")
-        return
+        with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as client:
+            client.settimeout(4.0)
+            client.connect("/run/signal-cli/socket")
+            client.sendall(json.dumps(request).encode() + b"\n")
 
-    if response.status_code not in {httpx.codes.OK, httpx.codes.CREATED}:
-        logger.error("Signal API returned HTTP status %d", response.status_code)
+            buffer = b""
+            while chunk := client.recv(65536):
+                buffer += chunk
+                while b"\n" in buffer:
+                    line, buffer = buffer.split(b"\n", maxsplit=1)
+                    response = json.loads(line)
+                    if response.get("id") == signal_rpc_id:
+                        if error := response.get("error"):
+                            logger.error("Signal RPC returned an error: %s", error)
+                        return
+
+            logger.error("Signal RPC socket closed before returning a response")
+    except OSError, json.JSONDecodeError:
+        logger.exception("Unable to communicate with signal-cli")