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99 lines
3.3 KiB
Python
99 lines
3.3 KiB
Python
''' incoming activities '''
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import json
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from urllib.parse import urldefrag
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from django.http import HttpResponse
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from django.http import HttpResponseBadRequest, HttpResponseNotFound
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from django.utils.decorators import method_decorator
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from django.views import View
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from django.views.decorators.csrf import csrf_exempt
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import requests
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from bookwyrm import activitypub, models
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from bookwyrm.tasks import app
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from bookwyrm.signatures import Signature
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@method_decorator(csrf_exempt, name='dispatch')
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# pylint: disable=no-self-use
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class Inbox(View):
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''' requests sent by outside servers'''
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def post(self, request, username=None):
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''' only works as POST request '''
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# make sure the user's inbox even exists
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if username:
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try:
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models.User.objects.get(localname=username)
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except models.User.DoesNotExist:
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return HttpResponseNotFound()
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# is it valid json? does it at least vaguely resemble an activity?
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try:
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activity_json = json.loads(request.body)
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except json.decoder.JSONDecodeError:
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return HttpResponseBadRequest()
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if not 'object' in activity_json or \
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not 'type' in activity_json or \
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not activity_json['type'] in activitypub.activity_objects:
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return HttpResponseNotFound()
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# verify the signature
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if not has_valid_signature(request, activity_json):
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if activity_json['type'] == 'Delete':
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# Pretend that unauth'd deletes succeed. Auth may be failing
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# because the resource or owner of the resource might have
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# been deleted.
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return HttpResponse()
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return HttpResponse(status=401)
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activity_task.delay(activity_json)
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return HttpResponse()
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@app.task
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def activity_task(activity_json):
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''' do something with this json we think is legit '''
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# lets see if the activitypub module can make sense of this json
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try:
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activity = activitypub.parse(activity_json)
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except activitypub.ActivitySerializerError:
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return
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# cool that worked, now we should do the action described by the type
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# (create, update, delete, etc)
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try:
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activity.action()
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except activitypub.ActivitySerializerError:
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# this is raised if the activity is discarded
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return
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def has_valid_signature(request, activity):
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''' verify incoming signature '''
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try:
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signature = Signature.parse(request)
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key_actor = urldefrag(signature.key_id).url
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if key_actor != activity.get('actor'):
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raise ValueError("Wrong actor created signature.")
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remote_user = activitypub.resolve_remote_id(
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key_actor, model=models.User)
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if not remote_user:
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return False
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try:
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signature.verify(remote_user.key_pair.public_key, request)
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except ValueError:
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old_key = remote_user.key_pair.public_key
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remote_user = activitypub.resolve_remote_id(
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remote_user.remote_id, model=models.User, refresh=True
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)
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if remote_user.key_pair.public_key == old_key:
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raise # Key unchanged.
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signature.verify(remote_user.key_pair.public_key, request)
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except (ValueError, requests.exceptions.HTTPError):
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return False
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return True
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