letsencrypt: Use new setup mechanism

plinth/modules/letsencrypt/__init__.py

@@ -24,10 +24,34 @@ from django.utils.translation import ugettext_lazy as _
 from plinth import action_utils
 from plinth import cfg
 from plinth.modules import names
+from plinth.utils import format_lazy
 
 
+version = 1
+
+is_essential = True
+
 depends = ['apps', 'names']
 
+title = _('Certificates (Let\'s Encrypt)')
+
+description = [
+    format_lazy(
+        _('A digital certficate allows users of a web service to verify the '
+          'identity of the service and to securely communicate with it. '
+          '{box_name} can automatically obtain and setup digital '
+          'certificates for each available domain.  It does so by proving '
+          'itself to be the owner of a domain to Let\'s Encrypt, a '
+          'certficate authority (CA).'), box_name=_(cfg.box_name)),
+
+    _('Let\'s Encrypt is a free, automated, and open certificate '
+      'authority, run for the public’s benefit by the Internet Security '
+      'Research Group (ISRG).  Please read and agree with the '
+      '<a href="https://letsencrypt.org/repository/">Let\'s Encrypt '
+      'Subscriber Agreement</a> before using this service.')
+]
+
+
 service = None
 
 
@@ -38,6 +62,11 @@ def init():
                      'glyphicon-lock', 'letsencrypt:index', 20)
 
 
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['letsencrypt'])
+
+
 def diagnose():
     """Run diagnostics and return the results."""
     results = []

plinth/modules/letsencrypt/templates/letsencrypt.html

@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -33,30 +33,7 @@
 </style>
 {% endblock %}
 
-{% block content %}
-
-  <h2>{% trans "Certificates (Let's Encrypt)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      A digital certficate allows users of a web service to verify the
-      identity of the service and to securely communicate with it.
-      {{ box_name }} can automatically obtain and setup digital
-      certificates for each available domain.  It does so by proving
-      itself to be the owner of a domain to Let's Encrypt, a
-      certficate authority (CA).
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      Let's Encrypt is a free, automated, and open certificate
-      authority, run for the public’s benefit by the Internet Security
-      Research Group (ISRG).  Please read and agree with the
-      <a href="https://letsencrypt.org/repository/">Let's Encrypt
-      Subscriber Agreement</a> before using this service.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <div class="row">
     <div class="col-lg-8">

plinth/modules/letsencrypt/views.py

@@ -29,20 +29,20 @@ import json
 import logging
 
 from plinth import actions
-from plinth import package
 from plinth.errors import ActionError
+from plinth.modules import letsencrypt
 from plinth.modules import names
 
 logger = logging.getLogger(__name__)
 
 
-@package.required(['letsencrypt'])
 def index(request):
     """Serve configuration page."""
     status = get_status()
 
     return TemplateResponse(request, 'letsencrypt.html',
-                            {'title': _('Certificates (Let\'s Encrypt)'),
+                            {'title': letsencrypt.title,
+                             'description': letsencrypt.description,
                              'status': status})