forked from mirrors/bookwyrm
130 lines
4.3 KiB
Python
130 lines
4.3 KiB
Python
""" incoming activities """
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import json
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import re
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from urllib.parse import urldefrag
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from django.http import HttpResponse, Http404
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from django.core.exceptions import BadRequest, PermissionDenied
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from django.shortcuts import get_object_or_404
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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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from bookwyrm.utils import regex
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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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# first check if this server is on our shitlist
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raise_is_blocked_user_agent(request)
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# make sure the user's inbox even exists
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if username:
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get_object_or_404(models.User, localname=username, is_active=True)
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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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raise BadRequest()
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# let's be extra sure we didn't block this domain
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raise_is_blocked_activity(activity_json)
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if (
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not "object" in activity_json
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or not "type" in activity_json
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or not activity_json["type"] in activitypub.activity_objects
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):
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raise Http404()
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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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def raise_is_blocked_user_agent(request):
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"""check if a request is from a blocked server based on user agent"""
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# check user agent
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user_agent = request.headers.get("User-Agent")
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if not user_agent:
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return
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url = re.search(rf"https?://{regex.DOMAIN}/?", user_agent)
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if not url:
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return
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url = url.group()
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if models.FederatedServer.is_blocked(url):
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raise PermissionDenied()
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def raise_is_blocked_activity(activity_json):
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"""get the sender out of activity json and check if it's blocked"""
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actor = activity_json.get("actor")
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# check if the user is banned/deleted
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existing = models.User.find_existing_by_remote_id(actor)
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if existing and existing.deleted:
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raise PermissionDenied()
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if not actor:
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# well I guess it's not even a valid activity so who knows
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return
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if models.FederatedServer.is_blocked(actor):
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raise PermissionDenied()
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@app.task(queue="medium_priority")
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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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activity = activitypub.parse(activity_json)
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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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activity.action()
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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(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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