- Adding in offline

Author: s-paquette

offline/LICENSE

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+Copyright (c) 2014, Ankit Jaiswal
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+THE POSSIBILITY OF SUCH DAMAGE.

offline/__init__.py

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+# -*- coding: utf-8 -*-
+from django.contrib import admin
+from models import Config
+
+admin.site.register(Config)

offline/admin.py

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+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+import re
+
+from django.template import Context
+from django.template.loader import get_template
+import offline
+from views import offline_view
+import sys
+
+# Customized for ISB-CGC by spaquett@systemsbiology.org
+# Changes:
+#   - Added exception for admin/ and static/ (so pages would load necessary JS and CSS, and so admin can access the
+#     admin app to turn it back off).
+#   - Altered how access is determined for users logged in
+#   - Added sanity check for presence of content-type (since sometimes it wasn't there) to prevent KeyErrors
+
+
+class OfflineMiddleware(object):
+
+    def process_request(self, request):
+        # Admin and static always go through
+        if request.path.startswith('/admin') or request.path.startswith('/static'):
+            return
+        # If offline isn't enabled, pass through
+        if not offline.is_enabled():
+            return
+
+        # Offline is enabled; double-check for staff users
+        if not (hasattr(request, 'user')) or not request.user.is_authenticated() or not (request.user.is_staff and request.user.is_superuser):
+            return offline_view(request)
+
+        return
+
+    def process_response(self, request, response):
+        return response
+
+    def is_html_response(self, response):
+        return ('Content-Type' in response and response['Content-Type'].startswith('text/html'))

offline/middleware.py

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+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.6 on 2017-02-16 00:46
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Config',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('key', models.CharField(max_length=100, unique=True, verbose_name='Key')),
+                ('value', models.BooleanField(default=False, verbose_name='Value')),
+                ('message', models.TextField(verbose_name='Message')),
+            ],
+        ),
+    ]

offline/migrations/0001_initial.py

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+from django.db import models
+from django.utils.translation import ugettext as _
+
+class Config(models.Model):
+    key = models.CharField(_('Key'), max_length=100, unique=True)
+    value = models.BooleanField(_('Value'), default=False)
+    message = models.TextField(_('Message'))
+
+    def __unicode__(self):
+      return self.key

offline/migrations/__init__.py

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+from models import Config
+
+
+def is_enabled():
+  try:
+    return Config.objects.get(key='offline').value
+  except Config.DoesNotExist:
+    set_defaults()
+
+
+def set_defaults():
+  option = Config.objects.create(
+      key= 'offline', 
+      value= False,
+      message= 'The site is under maintenance. Please come back soon.'
+      )
+  return option.value

offline/models.py

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+{% load i18n %}
+<div style="font-size:30px; text-align:center; background:#ff0; padding:10px 0; border:1px solid #990;">
+{% trans "Site is under maintenance." %}
+</div>

offline/offline.py

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+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>503 Service Unavailable</title>
+</head>
+<body>
+    <h1>{{message}}</h1>
+</body>
+</html>

offline/templates/admin_notification.html

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+from django.http import HttpResponse
+from django.template import loader
+from models import Config
+
+def offline_view(request):
+    offline_message = Config.objects.get(key='offline').message
+    context = {
+			'message':offline_message
+    }
+    return HttpResponse(loader.render_to_string('offline.html', context), status=503)