Start implementing webmention receiving :o the status page is ugly and there's no actual verification yet, but good start at least ;)

lemoncurry/settings/base.py

@@ -89,6 +89,7 @@ INSTALLED_APPS = [
     'lemonauth',
     'micropub',
     'users',
+    'webmention',
     'wellknowns',
 ]
 

lemoncurry/urls.py

@@ -41,6 +41,7 @@ urlpatterns = [
     url('^auth/', include('lemonauth.urls')),
     url('^micropub', include('micropub.urls')),
     url('^s/', include('shorturls.urls')),
+    url('^webmention', include('webmention.urls')),
 
     url(r'^django-rq/', include('django_rq.urls')),
     url(r'^sitemap\.xml$', sitemap.index, maps, name='sitemap'),

webmention/__init__.py

@@ -0,0 +1 @@
+default_app_config = 'webmention.apps.WebmentionConfig'

webmention/apps.py

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class WebmentionConfig(AppConfig):
+    name = 'webmention'

webmention/migrations/0001_initial.py

@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.10 on 2018-03-19 01:18
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+import model_utils.fields
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('entries', '0011_auto_20171120_1108'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Webmention',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created', model_utils.fields.AutoCreatedField(default=django.utils.timezone.now, editable=False, verbose_name='created')),
+                ('modified', model_utils.fields.AutoLastModifiedField(default=django.utils.timezone.now, editable=False, verbose_name='modified')),
+                ('source', models.CharField(max_length=255)),
+                ('target', models.CharField(max_length=255)),
+                ('state', models.CharField(choices=[('p', 'pending'), ('v', 'valid'), ('i', 'invalid'), ('d', 'deleted')], default='p', max_length=1)),
+                ('entry', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='mentions', to='entries.Entry')),
+            ],
+            options={
+                'default_related_name': 'mentions',
+            },
+        ),
+        migrations.AlterUniqueTogether(
+            name='webmention',
+            unique_together=set([('source', 'target')]),
+        ),
+    ]

webmention/models.py

@@ -0,0 +1,31 @@
+from django.db import models
+from entries.models import Entry
+from model_utils.models import TimeStampedModel
+
+
+class State:
+    PENDING = 'p'
+    VALID = 'v'
+    INVALID = 'i'
+    DELETED = 'd'
+    CHOICES = (
+        (PENDING, 'pending'),
+        (VALID, 'valid'),
+        (INVALID, 'invalid'),
+        (DELETED, 'deleted'),
+    )
+
+
+class Webmention(TimeStampedModel):
+    entry = models.ForeignKey(Entry, on_delete=models.CASCADE)
+    source = models.CharField(max_length=255)
+    target = models.CharField(max_length=255)
+    state = models.CharField(
+        choices=State.CHOICES,
+        default=State.PENDING,
+        max_length=1
+    )
+
+    class Meta:
+        default_related_name = 'mentions'
+        unique_together = ('source', 'target')

webmention/urls.py

@@ -0,0 +1,8 @@
+from django.conf.urls import url
+from . import views
+
+app_name = 'webmention'
+urlpatterns = (
+    url('^$', views.accept, name='accept'),
+    url('^s/(?P<id>\d+)$', views.status, name='status')
+)

webmention/views.py

@@ -0,0 +1,68 @@
+from django.http import HttpResponse
+from django.urls import resolve, reverse, Resolver404
+from django.shortcuts import get_object_or_404
+from django.views.decorators.csrf import csrf_exempt
+from django.views.decorators.http import require_GET, require_POST
+from entries.models import Entry
+from lemoncurry.utils import bad_req
+from urllib.parse import urljoin, urlparse
+
+from .models import State, Webmention
+
+
+@csrf_exempt
+@require_POST
+def accept(request):
+    if 'source' not in request.POST:
+        return bad_req('missing source url')
+    source_url = request.POST['source']
+
+    if 'target' not in request.POST:
+        return bad_req('missing target url')
+    target_url = request.POST['target']
+
+    source = urlparse(source_url)
+    target = urlparse(target_url)
+    if source.scheme not in ('http', 'https'):
+        return bad_req('unsupported source scheme')
+    if target.scheme not in ('http', 'https'):
+        return bad_req('unsupported target scheme')
+    if target.netloc != request.site.domain:
+        return bad_req('target not on this site')
+    origin = 'https://' + target.netloc
+
+    try:
+        match = resolve(target.path)
+    except Resolver404:
+        return bad_req('target not found')
+
+    if match.view_name != 'entries:entry':
+        return bad_req('target does not accept webmentions')
+
+    try:
+        entry = Entry.objects.get(pk=match.kwargs['id'])
+    except Entry.DoesNotExist:
+        return bad_req('target not found')
+
+    try:
+        mention = Webmention.objects.get(source=source_url, target=target_url)
+    except Webmention.DoesNotExist:
+        mention = Webmention()
+        mention.source = source_url
+        mention.target = target_url
+
+    mention.entry = entry
+    mention.state = State.PENDING
+    mention.save()
+    status = reverse('webmention:status', kwargs={'id': mention.id})
+
+    res = HttpResponse(status=201)
+    res['Location'] = urljoin(origin, status)
+    return res
+
+
+@csrf_exempt
+@require_GET
+def status(request, id):
+    mention = get_object_or_404(Webmention.objects, pk=id)
+    return HttpResponse(mention.get_state_display())