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import json
from asgiref.sync import async_to_sync
from django.conf import settings
from django.http import HttpResponse, HttpResponseBadRequest, JsonResponse
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import View
from activities.models import Post
from core import exceptions
from core.decorators import cache_page
from core.ld import canonicalise
from core.models import Config
from core.signatures import (
HttpSignature,
LDSignature,
VerificationError,
VerificationFormatError,
)
from takahe import __version__
from users.models import Identity, InboxMessage, SystemActor
from users.shortcuts import by_handle_or_404
class HttpResponseUnauthorized(HttpResponse):
status_code = 401
class HostMeta(View):
"""
Returns a canned host-meta response
"""
def get(self, request):
return HttpResponse(
"""<?xml version="1.0" encoding="UTF-8"?>
<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
<Link rel="lrdd" template="https://%s/.well-known/webfinger?resource={uri}"/>
</XRD>"""
% request.headers["host"],
content_type="application/xml",
)
class NodeInfo(View):
"""
Returns the well-known nodeinfo response, pointing to the 2.0 one
"""
def get(self, request):
host = request.META.get("HOST", settings.MAIN_DOMAIN)
return JsonResponse(
{
"links": [
{
"rel": "http://nodeinfo.diaspora.software/ns/schema/2.0",
"href": f"https://{host}/nodeinfo/2.0/",
}
]
}
)
@method_decorator(cache_page(), name="dispatch")
class NodeInfo2(View):
"""
Returns the nodeinfo 2.0 response
"""
def get(self, request):
# Fetch some user stats
local_identities = Identity.objects.filter(local=True).count()
local_posts = Post.objects.filter(local=True).count()
return JsonResponse(
{
"version": "2.0",
"software": {"name": "takahe", "version": __version__},
"protocols": ["activitypub"],
"services": {"outbound": [], "inbound": []},
"usage": {
"users": {"total": local_identities},
"localPosts": local_posts,
},
"openRegistrations": Config.system.signup_allowed
and not Config.system.signup_invite_only,
"metadata": {},
}
)
@method_decorator(cache_page(), name="dispatch")
class Webfinger(View):
"""
Services webfinger requests
"""
def get(self, request):
resource = request.GET.get("resource")
if not resource:
return HttpResponseBadRequest("No resource specified")
if not resource.startswith("acct:"):
return HttpResponseBadRequest("Not an account resource")
handle = resource[5:]
if handle.startswith("__system__@"):
# They are trying to webfinger the system actor
actor = SystemActor()
else:
actor = by_handle_or_404(request, handle)
handle = actor.handle
return JsonResponse(
{
"subject": f"acct:{handle}",
"aliases": [
actor.absolute_profile_uri(),
],
"links": [
{
"rel": "http://webfinger.net/rel/profile-page",
"type": "text/html",
"href": actor.absolute_profile_uri(),
},
{
"rel": "self",
"type": "application/activity+json",
"href": actor.actor_uri,
},
],
}
)
@method_decorator(csrf_exempt, name="dispatch")
class Inbox(View):
"""
AP Inbox endpoint
"""
def post(self, request, handle):
# Load the LD
document = canonicalise(json.loads(request.body), include_security=True)
# Find the Identity by the actor on the incoming item
# This ensures that the signature used for the headers matches the actor
# described in the payload.
identity = Identity.by_actor_uri(document["actor"], create=True, transient=True)
if not identity.public_key:
# See if we can fetch it right now
async_to_sync(identity.fetch_actor)()
if not identity.public_key:
exceptions.capture_message(
f"Inbox error: cannot fetch actor {document['actor']}"
)
return HttpResponseBadRequest("Cannot retrieve actor")
# See if it's from a blocked domain
if identity.domain.blocked:
# I love to lie! Throw it away!
exceptions.capture_message(
f"Inbox: Discarded message from {identity.domain}"
)
return HttpResponse(status=202)
# If there's a "signature" payload, verify against that
if "signature" in document:
try:
LDSignature.verify_signature(document, identity.public_key)
except VerificationFormatError as e:
exceptions.capture_message(
f"Inbox error: Bad LD signature format: {e.args[0]}"
)
return HttpResponseBadRequest(e.args[0])
except VerificationError:
exceptions.capture_message("Inbox error: Bad LD signature")
return HttpResponseUnauthorized("Bad signature")
# Otherwise, verify against the header (assuming it's the same actor)
else:
try:
HttpSignature.verify_request(
request,
identity.public_key,
)
except VerificationFormatError as e:
exceptions.capture_message(
f"Inbox error: Bad HTTP signature format: {e.args[0]}"
)
return HttpResponseBadRequest(e.args[0])
except VerificationError:
exceptions.capture_message("Inbox error: Bad HTTP signature")
return HttpResponseUnauthorized("Bad signature")
# Hand off the item to be processed by the queue
InboxMessage.objects.create(message=document)
return HttpResponse(status=202)
@method_decorator(cache_page(), name="dispatch")
class SystemActorView(View):
"""
Special endpoint for the overall system actor
"""
def get(self, request):
return JsonResponse(
canonicalise(
SystemActor().to_ap(),
include_security=True,
)
)
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