259 lines
8.3 KiB
Python
259 lines
8.3 KiB
Python
import json
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from asgiref.sync import async_to_sync
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from django.conf import settings
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from django.http import Http404, HttpResponse, HttpResponseBadRequest, JsonResponse
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from django.utils.decorators import method_decorator
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from django.views.decorators.cache import cache_control
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from django.views.decorators.csrf import csrf_exempt
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from django.views.generic import View
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from activities.models import Post
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from core import exceptions
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from core.decorators import cache_page
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from core.ld import canonicalise
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from core.models import Config
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from core.signatures import (
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HttpSignature,
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LDSignature,
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VerificationError,
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VerificationFormatError,
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)
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from core.views import StaticContentView
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from takahe import __version__
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from users.models import Identity, InboxMessage, SystemActor
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from users.shortcuts import by_handle_or_404
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class HttpResponseUnauthorized(HttpResponse):
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status_code = 401
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class HostMeta(View):
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"""
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Returns a canned host-meta response
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"""
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def get(self, request):
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return HttpResponse(
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"""<?xml version="1.0" encoding="UTF-8"?>
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<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
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<Link rel="lrdd" template="https://%s/.well-known/webfinger?resource={uri}"/>
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</XRD>"""
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% request.headers["host"],
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content_type="application/xml",
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)
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class NodeInfo(View):
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"""
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Returns the well-known nodeinfo response, pointing to the 2.0 one
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"""
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def get(self, request):
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host = request.META.get("HOST", settings.MAIN_DOMAIN)
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return JsonResponse(
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{
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"links": [
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{
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"rel": "http://nodeinfo.diaspora.software/ns/schema/2.0",
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"href": f"https://{host}/nodeinfo/2.0/",
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}
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]
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}
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)
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@method_decorator(cache_page(), name="dispatch")
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class NodeInfo2(View):
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"""
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Returns the nodeinfo 2.0 response
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"""
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def get(self, request):
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# Fetch some user stats
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local_identities = Identity.objects.filter(local=True).count()
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local_posts = Post.objects.filter(local=True).count()
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return JsonResponse(
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{
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"version": "2.0",
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"software": {"name": "takahe", "version": __version__},
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"protocols": ["activitypub"],
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"services": {"outbound": [], "inbound": []},
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"usage": {
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"users": {"total": local_identities},
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"localPosts": local_posts,
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},
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"openRegistrations": Config.system.signup_allowed,
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"metadata": {},
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}
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)
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@method_decorator(cache_page(), name="dispatch")
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class Webfinger(View):
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"""
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Services webfinger requests
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"""
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def get(self, request):
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resource = request.GET.get("resource")
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if not resource:
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return HttpResponseBadRequest("No resource specified")
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if not resource.startswith("acct:"):
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return HttpResponseBadRequest("Not an account resource")
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handle = resource[5:]
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if handle.startswith("__system__@"):
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# They are trying to webfinger the system actor
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actor = SystemActor()
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else:
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actor = by_handle_or_404(request, handle)
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return JsonResponse(actor.to_webfinger())
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@method_decorator(csrf_exempt, name="dispatch")
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class Inbox(View):
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"""
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AP Inbox endpoint
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"""
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def post(self, request, handle=None):
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# Reject bodies that are unfeasibly big
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if len(request.body) > settings.JSONLD_MAX_SIZE:
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return HttpResponseBadRequest("Payload size too large")
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# Load the LD
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document = canonicalise(json.loads(request.body), include_security=True)
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# Find the Identity by the actor on the incoming item
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# This ensures that the signature used for the headers matches the actor
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# described in the payload.
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identity = Identity.by_actor_uri(document["actor"], create=True, transient=True)
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if (
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document["type"] == "Delete"
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and document["actor"] == document["object"]
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and not identity.pk
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):
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# We don't have an Identity record for the user. No-op
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exceptions.capture_message(
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f"Inbox: Discarded delete message for unknown actor {document['actor']}"
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)
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return HttpResponse(status=202)
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if not identity.public_key:
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# See if we can fetch it right now
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async_to_sync(identity.fetch_actor)()
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if not identity.public_key:
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exceptions.capture_message(
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f"Inbox error: cannot fetch actor {document['actor']}"
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)
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return HttpResponseBadRequest("Cannot retrieve actor")
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# See if it's from a blocked user or domain
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if identity.blocked or identity.domain.blocked:
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# I love to lie! Throw it away!
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exceptions.capture_message(
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f"Inbox: Discarded message from {identity.actor_uri}"
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)
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return HttpResponse(status=202)
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# If there's a "signature" payload, verify against that
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if "signature" in document:
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try:
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LDSignature.verify_signature(document, identity.public_key)
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except VerificationFormatError as e:
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exceptions.capture_message(
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f"Inbox error: Bad LD signature format: {e.args[0]}"
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)
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return HttpResponseBadRequest(e.args[0])
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except VerificationError:
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exceptions.capture_message("Inbox error: Bad LD signature")
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return HttpResponseUnauthorized("Bad signature")
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# Otherwise, verify against the header (assuming it's the same actor)
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else:
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try:
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HttpSignature.verify_request(
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request,
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identity.public_key,
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)
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except VerificationFormatError as e:
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exceptions.capture_message(
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f"Inbox error: Bad HTTP signature format: {e.args[0]}"
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)
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return HttpResponseBadRequest(e.args[0])
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except VerificationError:
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exceptions.capture_message("Inbox error: Bad HTTP signature")
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return HttpResponseUnauthorized("Bad signature")
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# Hand off the item to be processed by the queue
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InboxMessage.objects.create(message=document)
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return HttpResponse(status=202)
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class Outbox(View):
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"""
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The ActivityPub outbox for an identity
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"""
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def get(self, request, handle):
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self.identity = by_handle_or_404(
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self.request,
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handle,
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local=False,
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fetch=True,
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)
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# If this not a local actor, 404
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if not self.identity.local:
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raise Http404("Not a local identity")
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# Return an ordered collection with the most recent 10 public posts
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posts = list(self.identity.posts.not_hidden().public()[:10])
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return JsonResponse(
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canonicalise(
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{
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"type": "OrderedCollection",
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"totalItems": len(posts),
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"orderedItems": [post.to_ap() for post in posts],
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}
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),
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content_type="application/activity+json",
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)
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@method_decorator(cache_control(max_age=60 * 15), name="dispatch")
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class EmptyOutbox(StaticContentView):
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"""
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A fixed-empty outbox for the system actor
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"""
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content_type: str = "application/activity+json"
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def get_static_content(self) -> str | bytes:
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return json.dumps(
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canonicalise(
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{
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"type": "OrderedCollection",
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"totalItems": 0,
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"orderedItems": [],
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}
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)
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)
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@method_decorator(cache_control(max_age=60 * 15), name="dispatch")
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class SystemActorView(StaticContentView):
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"""
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Special endpoint for the overall system actor
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"""
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content_type: str = "application/activity+json"
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def get_static_content(self) -> str | bytes:
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return json.dumps(
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canonicalise(
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SystemActor().to_ap(),
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include_security=True,
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)
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)
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