add basic webfinger support, good enough for now

viera/__init__.py

@@ -20,3 +20,5 @@ app = aiohttp.web.Application()
 
 from . import database
 from . import actor
+from . import webfinger
+

viera/webfinger.py

@@ -0,0 +1,24 @@
+import aiohttp.web
+from . import app
+
+
+async def webfinger(request):
+    subject = request.query['resource']
+
+    if subject != 'acct:viera@{}'.format(request.host):
+        return aiohttp.web.json_response({'error': 'user not found'}, status=404)
+
+    actor_uri = "https://{}/actor".format(request.host)
+    data = {
+        "aliases": [actor_uri],
+        "links": [
+            {"href": actor_uri, "rel": "self", "type": "application/activity+json"},
+            {"href": actor_uri, "rel": "self", "type": "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\""}
+        ],
+        "subject": subject
+    }
+
+    return aiohttp.web.json_response(data)
+
+
+app.router.add_get('/.well-known/webfinger', webfinger)