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

Pipfile

@@ -25,6 +25,7 @@ python-slugify = "*"
 markdown = "*"
 bleach = "*"
 django-debug-toolbar = "*"
+xrd = "*"
 
 
 [dev-packages]

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "89e62295608d784115e1097fc46d5aa458ad26971e7668a1835717f9409fddac"
+            "sha256": "dc39eb988fd0df9d07f81c689d5ee326958f557b423bd98e6d52d0610e5691f5"
         },
         "host-environment-markers": {
             "implementation_name": "cpython",
@@ -164,6 +164,13 @@
             ],
             "version": "==2.6"
         },
+        "isodate": {
+            "hashes": [
+                "sha256:aa4d33c06640f5352aca96e4b81afd8ab3b47337cc12089822d6f322ac772c81",
+                "sha256:2e364a3d5759479cdb2d37cce6b9376ea504db2ff90252a2e5b7cc89cc9ff2d8"
+            ],
+            "version": "==0.6.0"
+        },
         "lxml": {
             "hashes": [
                 "sha256:7a8715539adb41c78129983ba69d852e0102a3f51d559eeb91dce1f6290c4ad0",
@@ -397,6 +404,12 @@
                 "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"
             ],
             "version": "==0.5.1"
+        },
+        "xrd": {
+            "hashes": [
+                "sha256:51d01f732b5b5b7983c5179ffaed864408d95a667b3a6630fe27aa7528274089"
+            ],
+            "version": "==0.1"
         }
     },
     "develop": {}

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'
+    )