Add basic support for /.well-known/host-meta(.json)?, not much info in it so far but it works

wellknowns/urls.py

@@ -5,4 +5,6 @@ from . import views
 app_name = 'wellknowns'
 urlpatterns = [
     url(r'^keybase.txt$', views.keybase, name='keybase'),
+    url(r'^host-meta$', views.host_meta_xml, name='host-meta'),
+    url(r'^host-meta.json$', views.host_meta_json, name='host-meta.json'),
 ]

wellknowns/views/__init__.py

@@ -0,0 +1,2 @@
+from .static import keybase
+from .host_meta import host_meta_xml, host_meta_json

wellknowns/views/host_meta.py

@@ -0,0 +1,35 @@
+from django.http import HttpResponse
+from django.conf import settings
+from lemoncurry.templatetags.lemoncurry_tags import get_package_json
+from xrd import XRD, Attribute, Element, Link
+
+
+def add_links(dest):
+    package = get_package_json()
+    links = (
+        Link(rel='license', href='https://creativecommons.org/licenses/by-sa/4.0/'),
+        Link(rel='code-repository', href=package['repository']),
+    )
+    dest.extend(links)
+
+
+def host_meta(request):
+    h = XRD()
+    h.attributes.append(Attribute('xmlns:hm', 'http://host-meta.net/ns/1.0'))
+    h.elements.append(Element('hm:Host', request.META['HTTP_HOST']))
+    add_links(h.links)
+    return h
+
+
+def host_meta_xml(request):
+    return HttpResponse(
+        host_meta(request).to_xml().toprettyxml(indent='  ', encoding='utf-8'),
+        content_type='application/xrd+xml',
+    )
+
+
+def host_meta_json(request):
+    return HttpResponse(
+        host_meta(request).to_json(),
+        content_type='application/json'
+    )