124 lines
4.0 KiB
Python
124 lines
4.0 KiB
Python
"""Implement webhook handlers."""
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from typing import Any, Dict
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import hashlib
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import hmac
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import json
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import logging
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from background_task import background
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from django.conf import settings
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from django.core.exceptions import ObjectDoesNotExist
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from django.db.utils import IntegrityError
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from django.http import HttpResponse, HttpResponseBadRequest
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from django.http.request import HttpRequest
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from django.views.decorators.csrf import csrf_exempt
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from django.views.decorators.http import require_POST
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from users.blender_id import BIDSession
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bid = BIDSession()
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logger = logging.getLogger(__name__)
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WEBHOOK_MAX_BODY_SIZE = 1024 * 10 # 10 kB is large enough
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@csrf_exempt
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@require_POST
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def user_modified_webhook(request: HttpRequest) -> HttpResponse:
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"""Handle user modified request sent by Blender ID.
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Payload is expected to have the following format:
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{
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"avatar_changed": false,
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"email": "newmail@example.com",
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"full_name": "John Doe",
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"id": 2,
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"old_email": "mail@example.com",
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"roles": ["role1", "role2"],
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"confirmed_email_at": "2022-09-01T13:47:00+00:00",
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"date_deletion_requested": "2020-01-25T09:51:00+00:00",
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}
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"""
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hmac_secret = settings.BLENDER_ID['WEBHOOK_USER_MODIFIED_SECRET']
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if isinstance(hmac_secret, str):
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hmac_secret = hmac_secret.encode()
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# Check the content type
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if request.content_type != 'application/json':
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logger.info(f'unexpected content type {request.content_type}')
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return HttpResponseBadRequest('Unsupported Content-Type')
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# Check the length of the body
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content_length = int(request.headers['CONTENT_LENGTH'])
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if content_length > WEBHOOK_MAX_BODY_SIZE:
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return HttpResponse('Payload Too Large', status=413)
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body = request.body
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if len(body) != content_length:
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return HttpResponseBadRequest("Content-Length header doesn't match content")
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# Validate the request
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mac = hmac.new(hmac_secret, body, hashlib.sha256)
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req_hmac = request.headers.get('X-Webhook-HMAC', '')
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our_hmac = mac.hexdigest()
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if not hmac.compare_digest(req_hmac, our_hmac):
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logger.info(f'Invalid HMAC {req_hmac}, expected {our_hmac}')
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return HttpResponseBadRequest('Invalid HMAC')
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try:
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payload = json.loads(body)
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# TODO(anna) validate the payload
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logger.info('payload: %s', payload)
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except json.JSONDecodeError:
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logger.exception('Malformed JSON received')
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return HttpResponseBadRequest('Malformed JSON')
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handle_user_modified(payload)
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return HttpResponse(status=204)
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@background()
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def handle_user_modified(payload: Dict[Any, Any]) -> None:
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"""Handle payload of a user modified webhook, updating User when necessary."""
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oauth_user_id = str(payload['id'])
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try:
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oauth_user_info = bid.get_oauth_user_info(oauth_user_id)
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except ObjectDoesNotExist:
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logger.warning(f'Cannot update user: no OAuth info found for ID {oauth_user_id}')
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return
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user = oauth_user_info.user
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if payload.get('date_deletion_requested'):
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user.request_deletion(payload['date_deletion_requested'])
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return
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try:
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if payload['email'] != user.email:
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user.email = payload['email']
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user.save(update_fields=['email'])
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except IntegrityError:
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logger.exception(f'Unable to update email for {user}: duplicate email')
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update_fields = set()
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if payload['full_name'] != user.full_name:
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user.full_name = payload['full_name']
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update_fields.add('full_name')
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if 'confirmed_email_at' in payload:
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user.confirmed_email_at = payload['confirmed_email_at']
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update_fields.add('confirmed_email_at')
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if update_fields:
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user.save(update_fields=update_fields)
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if payload.get('avatar_changed') or not user.image:
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bid.copy_avatar_from_blender_id(user=user)
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# Attempt to update the username
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bid.update_username(user, oauth_user_id)
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# Attempt to update the badges
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bid.copy_badges_from_blender_id(user=user)
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