Add support for check for the latest released version of Mayan.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/apps.py

@@ -20,10 +20,10 @@ from .handlers import (
     user_locale_profile_session_config, user_locale_profile_create
 )
 from .links import (
-    link_about, link_code, link_current_user_details, link_current_user_edit,
-    link_current_user_locale_profile_edit, link_documentation, link_filters,
-    link_forum, link_license, link_packages_licenses, link_setup, link_support,
-    link_tools
+    link_about, link_check_version, link_code, link_current_user_details,
+    link_current_user_edit, link_current_user_locale_profile_edit,
+    link_documentation, link_filters, link_forum, link_license,
+    link_packages_licenses, link_setup, link_support, link_tools
 )
 from .literals import DELETE_STALE_UPLOADS_INTERVAL
 from .menus import menu_about, menu_main, menu_tools, menu_user
@@ -123,6 +123,7 @@ class CommonApp(MayanAppConfig):
             links=(
                 link_about, link_support, link_documentation, link_forum,
                 link_code, link_license, link_packages_licenses,
+                link_check_version
             )
         )
 

mayan/apps/common/exceptions.py

@@ -0,0 +1,16 @@
+from __future__ import unicode_literals
+
+
+class BaseCommonException(Exception):
+    """
+    Base exception for the common app
+    """
+    pass
+
+
+class NotLatestVersion(BaseCommonException):
+    """
+    The installed version is not the latest available version
+    """
+    def __init__(self, upstream_version):
+        self.upstream_version = upstream_version

mayan/apps/common/links.py

@@ -8,6 +8,10 @@ from navigation import Link
 link_about = Link(
     icon='fa fa-info', text=_('About this'), view='common:about_view'
 )
+link_check_version = Link(
+    icon='fa fa-refresh', text=_('Check for updates'),
+    view='common:check_version_view'
+)
 link_current_user_details = Link(
     icon='fa fa-user', text=_('User details'),
     view='common:current_user_details'

mayan/apps/common/literals.py

@@ -4,7 +4,8 @@ from django.utils.translation import ugettext_lazy as _
 
 
 DELETE_STALE_UPLOADS_INTERVAL = 60 * 10  # 10 minutes
-
+MAYAN_PYPI_NAME = 'mayan-edms'
+PYPI_URL = 'https://pypi.python.org/pypi'
 TIME_DELTA_UNIT_DAYS = 'days'
 TIME_DELTA_UNIT_HOURS = 'hours'
 TIME_DELTA_UNIT_MINUTES = 'minutes'

mayan/apps/common/urls.py

@@ -5,7 +5,7 @@ from django.views.i18n import javascript_catalog, set_language
 
 from .api_views import APIContentTypeList
 from .views import (
-    AboutView, CurrentUserDetailsView, CurrentUserEditView,
+    AboutView, CheckVersionView, CurrentUserDetailsView, CurrentUserEditView,
     CurrentUserLocaleProfileDetailsView, CurrentUserLocaleProfileEditView,
     FaviconRedirectView, FilterResultListView, FilterSelectView, HomeView,
     LicenseView, PackagesLicensesView, SetupListView, ToolsListView,
@@ -15,6 +15,10 @@ from .views import (
 urlpatterns = [
     url(r'^$', HomeView.as_view(), name='home'),
     url(r'^about/$', AboutView.as_view(), name='about_view'),
+    url(
+        r'^check_version/$', CheckVersionView.as_view(),
+        name='check_version_view'
+    ),
     url(r'^license/$', LicenseView.as_view(), name='license_view'),
     url(
         r'^packages/licenses/$', PackagesLicensesView.as_view(),

mayan/apps/common/utils.py

@@ -5,17 +5,32 @@ import os
 import shutil
 import tempfile
 import types
+import xmlrpclib
 
 from django.conf import settings
 from django.utils.datastructures import MultiValueDict
 from django.utils.http import urlquote as django_urlquote
 from django.utils.http import urlencode as django_urlencode
 
+import mayan
+
+from .exceptions import NotLatestVersion
+from .literals import MAYAN_PYPI_NAME, PYPI_URL
 from .settings import setting_temporary_directory
 
 logger = logging.getLogger(__name__)
 
 
+def check_version():
+    pypi = xmlrpclib.ServerProxy(PYPI_URL)
+    versions = pypi.package_releases(MAYAN_PYPI_NAME)
+
+    if versions[0] != mayan.__version__:
+        raise NotLatestVersion(upstream_version=versions[0])
+    else:
+        return True
+
+
 # http://stackoverflow.com/questions/123198/how-do-i-copy-a-file-in-python
 def copyfile(source, destination, buffer_size=1024 * 1024):
     """

mayan/apps/common/views.py

@@ -13,6 +13,7 @@ from django.utils.translation import ugettext_lazy as _, ugettext
 from django.views.generic import RedirectView, TemplateView
 
 from .classes import Filter
+from .exceptions import NotLatestVersion
 from .forms import (
     FilterForm, LicenseForm, LocaleProfileForm, LocaleProfileForm_view,
     PackagesLicensesForm, UserForm, UserForm_view
@@ -25,12 +26,33 @@ from .generics import (  # NOQA
     SimpleView
 )
 from .menus import menu_tools, menu_setup
+from .utils import check_version
 
 
 class AboutView(TemplateView):
     template_name = 'appearance/about.html'
 
 
+class CheckVersionView(SimpleView):
+    template_name = 'appearance/generic_template.html'
+
+    def get_extra_context(self):
+        try:
+            check_version()
+        except NotLatestVersion as exception:
+            message = _(
+                'The version you are using is outdated. The latest version '
+                'is {}'.format(exception.upstream_version)
+            )
+        else:
+            message = _('Your version is up-to-date.')
+
+        return {
+            'title': _('Check for updates'),
+            'content': message
+        }
+
+
 class CurrentUserDetailsView(SingleObjectDetailView):
     form_class = UserForm_view