Add page where users can say they want branding

At the moment branding is an undocumented feature. We get a bunch of
support tickets from teams asking its possible.

This commit:
- lets people know it’s possible, and what the options are
- is the first step towards making this process as self-service as
  possible

In some cases we will be able to infer a user’s organisation from there
email address, and Google image search their logo. So the experience for
them is that they press a button and government just sorts it out for
you (also known as "the dream").

In other cases we will have to get back to people asking for a copy of
their logo, or to find out about their service, but this is what we have
to do at the moment anyway.

app/main/forms.py

@@ -931,3 +931,23 @@ class LinkOrganisationsForm(StripWhitespaceForm):
             DataRequired()
         ]
     )
+
+
+branding_options = (
+    ('govuk', 'GOV.UK only'),
+    ('both', 'GOV.UK and logo'),
+    ('org', 'Your logo'),
+    ('org_banner', 'Your logo on a colour'),
+)
+branding_options_dict = dict(branding_options)
+
+
+class BrandingOptionsEmail(StripWhitespaceForm):
+
+    options = RadioField(
+        'Branding options',
+        choices=branding_options,
+        validators=[
+            DataRequired()
+        ],
+    )

app/main/views/service_settings.py

@@ -25,6 +25,7 @@ from app import (
 )
 from app.main import main
 from app.main.forms import (
+    BrandingOptionsEmail,
     ConfirmPasswordForm,
     FreeSMSAllowance,
     InternationalSMSForm,
@@ -41,6 +42,7 @@ from app.main.forms import (
     ServiceSmsSenderForm,
     ServiceSwitchLettersForm,
     SMSPrefixForm,
+    branding_options_dict,
 )
 from app.utils import (
     AgreementInfo,
@@ -884,6 +886,44 @@ def link_service_to_organisation(service_id):
     )
 
 
+@main.route("/services/<service_id>/branding-request/email", methods=['GET', 'POST'])
+@login_required
+@user_has_permissions('manage_service')
+def branding_request(service_id):
+
+    form = BrandingOptionsEmail(
+        options=current_service['branding']
+    )
+
+    if form.validate_on_submit():
+        zendesk_client.create_ticket(
+            subject='Email branding request - {}'.format(current_service['name']),
+            message=(
+                'On behalf of {} ({})\n'
+                '\n---'
+                '\nBranding requested: {}'
+            ).format(
+                current_service['name'],
+                url_for('main.service_dashboard', service_id=current_service['id'], _external=True),
+                branding_options_dict[form.options.data],
+            ),
+            ticket_type=zendesk_client.TYPE_QUESTION,
+            user_email=current_user.email_address,
+            user_name=current_user.name,
+        )
+
+        flash((
+            'Thanks for your branding request. We’ll get back to you '
+            'within one working day.'
+        ), 'default')
+        return redirect(url_for('.service_settings', service_id=service_id))
+
+    return render_template(
+        'views/service-settings/branding/email-options.html',
+        form=form,
+    )
+
+
 def get_branding_as_value_and_label(email_branding):
     return [
         (branding['id'], branding['name'])