letsencrypt: Implement re-obtain separately

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Joseph Nuthalapati <njoseph@thoughtworks.com>

plinth/modules/letsencrypt/__init__.py

@@ -119,10 +119,21 @@ def diagnose():
 def certificate_obtain(domain):
     """Obtain a certificate for a domain and notify handlers."""
     actions.superuser_run('letsencrypt', ['obtain', '--domain', domain])
+    components.on_certificate_event('obtained', [domain], None)
 
-    # Don't trigger an obtained event. Obtaining a certificate freshly also
-    # leads to a renewal (deploy) event from Let's Encrypt. There is no easy
-    # way to distinguish if the event is an initial event or a renewal event.
+
+def certificate_reobtain(domain):
+    """Re-obtain a certificate for a domain and notify handlers.
+
+    Don't trigger an obtained event. Re-obtaining a certificate also leads to a
+    renewal (deploy) event from Let's Encrypt. Further, this event is not sent
+    when obtaining the certificate for the first time. There is no easy way to
+    distinguish if a renewal event is trigger because of obtain or because of
+    re-obtain. Hence, handle re-obtain differently from obtain and don't
+    trigger obtain event (LE will trigger a renewal event).
+
+    """
+    actions.superuser_run('letsencrypt', ['obtain', '--domain', domain])
 
 
 def certificate_revoke(domain):

plinth/modules/letsencrypt/templates/letsencrypt.html

@@ -94,7 +94,7 @@
             <td>
               {% if domain_status.certificate_available %}
                 <form class="form form-inline" method="post"
-                      action="{% url 'letsencrypt:obtain' domain %}">
+                      action="{% url 'letsencrypt:re-obtain' domain %}">
                   {% csrf_token %}
                   <button class="btn btn-sm btn-default" type="submit">
                     {% trans "Re-obtain" %}</button>

plinth/modules/letsencrypt/urls.py

@@ -24,10 +24,12 @@ from . import views
 
 urlpatterns = [
     url(r'^sys/letsencrypt/$', views.index, name='index'),
-    url(r'^sys/letsencrypt/revoke/(?P<domain>[^/]+)/$', views.revoke,
-        name='revoke'),
     url(r'^sys/letsencrypt/obtain/(?P<domain>[^/]+)/$', views.obtain,
         name='obtain'),
+    url(r'^sys/letsencrypt/re-obtain/(?P<domain>[^/]+)/$', views.reobtain,
+        name='re-obtain'),
+    url(r'^sys/letsencrypt/revoke/(?P<domain>[^/]+)/$', views.revoke,
+        name='revoke'),
     url(r'^sys/letsencrypt/delete/(?P<domain>[^/]+)/$', views.delete,
         name='delete'),
 ]

plinth/modules/letsencrypt/views.py

@@ -82,6 +82,23 @@ def obtain(request, domain):
     return redirect(reverse_lazy('letsencrypt:index'))
 
 
+@require_POST
+def reobtain(request, domain):
+    """Re-obtain a certificate for a given domain."""
+    try:
+        letsencrypt.certificate_reobtain(domain)
+        messages.success(
+            request,
+            _('Certificate successfully obtained for domain {domain}').format(
+                domain=domain))
+    except ActionError as exception:
+        messages.error(
+            request,
+            _('Failed to obtain certificate for domain {domain}: {error}').
+            format(domain=domain, error=exception.args[2]))
+    return redirect(reverse_lazy('letsencrypt:index'))
+
+
 @require_POST
 def delete(request, domain):
     """Delete a certificate for a given domain, and cleanup renewal config."""