add broadcast to template_types and add broadcast_data

had to go through the code and change a few places where we filter on
template types. i specifically didn't worry about jobs or notifications.

Also, add braodcast_data - a json column that might contain arbitrary
broadcast data that we'll figure out as we go. We don't know what it'll
look like, but it should be returned by the API

app/utils.py

@@ -4,7 +4,12 @@ import pytz
 from flask import url_for
 from sqlalchemy import func
 from notifications_utils.timezones import convert_utc_to_bst
-from notifications_utils.template import SMSMessageTemplate, HTMLEmailTemplate, LetterPrintTemplate
+from notifications_utils.template import (
+    SMSMessageTemplate,
+    HTMLEmailTemplate,
+    LetterPrintTemplate,
+    BroadcastMessageTemplate,
+)
 
 
 local_timezone = pytz.timezone("Europe/London")
@@ -30,9 +35,12 @@ def url_with_token(data, url, config, base_url=None):
 
 
 def get_template_instance(template, values):
-    from app.models import SMS_TYPE, EMAIL_TYPE, LETTER_TYPE
+    from app.models import SMS_TYPE, EMAIL_TYPE, LETTER_TYPE, BROADCAST_TYPE
     return {
-        SMS_TYPE: SMSMessageTemplate, EMAIL_TYPE: HTMLEmailTemplate, LETTER_TYPE: LetterPrintTemplate
+        SMS_TYPE: SMSMessageTemplate,
+        EMAIL_TYPE: HTMLEmailTemplate,
+        LETTER_TYPE: LetterPrintTemplate,
+        BROADCAST_TYPE: BroadcastMessageTemplate,
     }[template['template_type']](template, values)
 
 
@@ -70,14 +78,16 @@ def get_london_month_from_utc_column(column):
 
 
 def get_public_notify_type_text(notify_type, plural=False):
-    from app.models import (SMS_TYPE, UPLOAD_DOCUMENT, PRECOMPILED_LETTER)
+    from app.models import (SMS_TYPE, BROADCAST_TYPE, UPLOAD_DOCUMENT, PRECOMPILED_LETTER)
     notify_type_text = notify_type
     if notify_type == SMS_TYPE:
         notify_type_text = 'text message'
-    if notify_type == UPLOAD_DOCUMENT:
+    elif notify_type == UPLOAD_DOCUMENT:
         notify_type_text = 'document'
-    if notify_type == PRECOMPILED_LETTER:
+    elif notify_type == PRECOMPILED_LETTER:
         notify_type_text = 'precompiled letter'
+    elif notify_type == BROADCAST_TYPE:
+        notify_type_text = 'broadcast message'
 
     return '{}{}'.format(notify_type_text, 's' if plural else '')