Send email notification on publication

When publishing a layer, send an email notification to all of that
layer's maintainers. Include information on how to edit the layer, plus
contact details for the first active staff user if there are any
problems (we could make this configurable in future, but for now this is
sufficient).

Fixes [YOCTO #11208]

Signed-off-by: Amanda Brindle <amanda.r.brindle@intel.com>
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

layerindex/views.py

@@ -5,7 +5,7 @@
 # Licensed under the MIT license, see COPYING.MIT for details
 
 import sys
-from django.shortcuts import get_object_or_404, render
+from django.shortcuts import get_object_or_404, get_list_or_404, render
 from django.http import HttpResponse, HttpResponseRedirect, HttpResponseForbidden, Http404
 from django.core.urlresolvers import reverse, reverse_lazy, resolve
 from django.core.exceptions import PermissionDenied
@@ -261,6 +261,38 @@ def _check_url_branch(kwargs):
 def publish(request, name):
     if not (request.user.is_authenticated() and request.user.has_perm('layerindex.publish_layer')):
         raise PermissionDenied
+    layeritem = get_object_or_404(LayerItem, name=name)
+    layerbranch = get_object_or_404(LayerBranch, layer=layeritem)
+    layer_url = request.build_absolute_uri(reverse('layer_item', args=(layerbranch.branch, layeritem.name)))
+    maintainers = get_list_or_404(LayerMaintainer, layerbranch=layerbranch)
+    from_email = settings.SUBMIT_EMAIL_FROM
+    subjecttext = get_template('layerindex/publishemailsubject.txt')
+    bodytext = get_template('layerindex/publishemail.txt')
+    maintainer_names = [m.name for m in maintainers]
+    # find appropriate help contact
+    for user in User.objects.all():
+        if user.username != 'root' and (user.is_staff or user.is_superuser) and user.is_active:
+            help_contact = user
+            break
+
+    # create subject from subject template
+    d = Context({
+        'layer_name': layeritem.name,
+        'site_name': request.META['HTTP_HOST'],
+    })
+    subject = subjecttext.render(d).rstrip()
+
+    #create body from body template
+    d = Context({
+        'maintainers': maintainer_names,
+        'layer_name': layeritem.name,
+        'layer_url': layer_url,
+        'help_contact': help_contact,
+    })
+    body = bodytext.render(d)
+
+    tasks.send_email.apply_async((subject, body, from_email, [m.email for m in maintainers]))
+
     return _statuschange(request, name, 'P')
 
 def _statuschange(request, name, newstatus):

templates/layerindex/publishemail.txt

@@ -0,0 +1,9 @@
+Hi {{ maintainers|slice:":-1"|join:", "}}{% if maintainers|length > 2 %},{% endif %}{% if maintainers|length > 1 %} and {% endif %}{{ maintainers|last }},
+
+You are listed as the {% if maintainers|length > 1 %}maintainers{% else %}maintainer{% endif %} for the new layer, {{ layer_name }}. This layer has now been published. You can view it at the following URL:
+
+ {{ layer_url }}
+
+If you need to make changes to this layer's entry in the index in the future, create an account (using this email address) if you haven't already, and you should then be able to click on "Edit layer" on the layer's detail page and make the desired changes. If you need any assistance please contact {% if help_contact.first_name and help_contact.last_name %}{{ help_contact.first_name }} {{ help_contact.last_name}}{% else %}{{ help_contact.username }}{% endif %} <{{ help_contact.email }}>.
+
+Thanks!

templates/layerindex/publishemailsubject.txt

@@ -0,0 +1 @@
+{{site_name}}: {{layer_name }} published