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import json
from asgiref.sync import async_to_sync
from django.http import Http404, 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 core.ld import canonicalise
from core.signatures import (
HttpSignature,
LDSignature,
VerificationError,
VerificationFormatError,
)
from users.models import Identity, InboxMessage
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.META["HTTP_HOST"],
content_type="application/xml",
)
class Webfinger(View):
"""
Services webfinger requests
"""
def get(self, request):
resource = request.GET.get("resource")
if not resource.startswith("acct:"):
raise Http404("Not an account resource")
handle = resource[5:].replace("testfedi", "feditest")
identity = by_handle_or_404(request, handle)
return JsonResponse(
{
"subject": f"acct:{identity.handle}",
"aliases": [
identity.urls.view_short.full(),
],
"links": [
{
"rel": "http://webfinger.net/rel/profile-page",
"type": "text/html",
"href": identity.urls.view_short.full(),
},
{
"rel": "self",
"type": "application/activity+json",
"href": identity.actor_uri,
},
],
}
)
class Actor(View):
"""
Returns the AP Actor object
"""
def get(self, request, handle):
identity = by_handle_or_404(self.request, handle)
response = {
"@context": [
"https://www.w3.org/ns/activitystreams",
"https://w3id.org/security/v1",
],
"id": identity.actor_uri,
"type": "Person",
"inbox": identity.actor_uri + "inbox/",
"preferredUsername": identity.username,
"publicKey": {
"id": identity.public_key_id,
"owner": identity.actor_uri,
"publicKeyPem": identity.public_key,
},
"published": identity.created.strftime("%Y-%m-%dT%H:%M:%SZ"),
"url": identity.urls.view_short.full(),
}
if identity.name:
response["name"] = identity.name
if identity.summary:
response["summary"] = identity.summary
return JsonResponse(canonicalise(response, include_security=True))
@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)
if not identity.public_key:
# See if we can fetch it right now
async_to_sync(identity.fetch_actor)()
if not identity.public_key:
print("Cannot get actor")
return HttpResponseBadRequest("Cannot retrieve actor")
# 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:
print("Bad LD signature format:", e.args[0])
return HttpResponseBadRequest(e.args[0])
except VerificationError:
print("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:
print("Bad HTTP signature format:", e.args[0])
return HttpResponseBadRequest(e.args[0])
except VerificationError:
print("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)
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