90 lines
2.9 KiB
Python
90 lines
2.9 KiB
Python
"""Matrix Webhook main request handler."""
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import json
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import logging
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from http import HTTPStatus
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from hmac import HMAC
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from markdown import markdown
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from . import conf, formatters, utils
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LOGGER = logging.getLogger("matrix_webhook.handler")
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async def matrix_webhook(request):
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"""
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Coroutine given to the server, st. it knows what to do with an HTTP request.
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This one handles a POST, checks its content, and forwards it to the matrix room.
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"""
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LOGGER.debug(f"Handling {request=}")
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data_b = await request.read()
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try:
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data = json.loads(data_b.decode())
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except json.decoder.JSONDecodeError:
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return utils.create_json_response(HTTPStatus.BAD_REQUEST, "Invalid JSON")
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# legacy naming
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if "text" in data and "body" not in data:
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data["body"] = data["text"]
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# allow key to be passed as a parameter
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if "key" in request.rel_url.query and "key" not in data:
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data["key"] = request.rel_url.query["key"]
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if "formatter" in request.rel_url.query:
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try:
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data = getattr(formatters, request.rel_url.query["formatter"])(
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data, request.headers
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)
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except AttributeError:
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return utils.create_json_response(
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HTTPStatus.BAD_REQUEST, "Unknown formatter"
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)
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if "room_id" in request.rel_url.query and "room_id" not in data:
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data["room_id"] = request.rel_url.query["room_id"]
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if "room_id" not in data:
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data["room_id"] = request.path.lstrip("/")
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# If we get a good SHA-256 HMAC digest,
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# we can consider that the sender has the right API key
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if "digest" in data:
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if data["digest"] == HMAC(conf.API_KEY.encode(), data_b, "sha256").hexdigest():
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data["key"] = conf.API_KEY
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else: # but if there is a wrong digest, an informative error should be provided
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return utils.create_json_response(
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HTTPStatus.UNAUTHORIZED, "Invalid SHA-256 HMAC digest"
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)
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missing = []
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for key in ["body", "key", "room_id"]:
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if key not in data or not data[key]:
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missing.append(key)
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if missing:
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return utils.create_json_response(
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HTTPStatus.BAD_REQUEST, f"Missing {', '.join(missing)}"
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)
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if data["key"] != conf.API_KEY:
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return utils.create_json_response(HTTPStatus.UNAUTHORIZED, "Invalid API key")
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if "formatted_body" in data:
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formatted_body = data["formatted_body"]
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else:
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formatted_body = markdown(str(data["body"]), extensions=["extra"])
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# try to join room first -> non none response means error
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resp = await utils.join_room(data["room_id"])
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if resp is not None:
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return resp
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content = {
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"msgtype": "m.text",
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"body": data["body"],
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"format": "org.matrix.custom.html",
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"formatted_body": formatted_body,
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}
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return await utils.send_room_message(data["room_id"], content)
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