Add JSON schema for updating template

We did not have a JSON schema for updating a template. Since we will
remove the postage constraint from the templates table, this adds a JSON
schema for updating a template so that we can use it to check that the
postage is one of the allowed values.

app/template/rest.py

@@ -37,7 +37,7 @@ from app.models import SMS_TYPE, Template, SECOND_CLASS, LETTER_TYPE
 from app.notifications.validators import service_has_permission, check_reply_to
 from app.schema_validation import validate
 from app.schemas import (template_schema, template_history_schema)
-from app.template.template_schemas import post_create_template_schema
+from app.template.template_schemas import post_create_template_schema, post_update_template_schema
 from app.utils import get_public_notify_type_text
 
 template_blueprint = Blueprint('template', __name__, url_prefix='/service/<uuid:service_id>/template')
@@ -110,6 +110,7 @@ def update_template(service_id, template_id):
         raise InvalidRequest(errors, 403)
 
     data = request.get_json()
+    validate(data, post_update_template_schema)
 
     # if redacting, don't update anything else
     if data.get('redact_personalisation') is True:

app/template/template_schemas.py

@@ -2,7 +2,7 @@ from app.models import (
     TEMPLATE_PROCESS_TYPE,
     TEMPLATE_TYPES,
 )
-from app.schema_validation.definitions import uuid
+from app.schema_validation.definitions import nullable_uuid, uuid
 
 post_create_template_schema = {
     "$schema": "http://json-schema.org/draft-07/schema#",
@@ -13,7 +13,7 @@ post_create_template_schema = {
         "name": {"type": "string"},
         "template_type": {"enum": TEMPLATE_TYPES},
         "service": uuid,
-        "process_type": {"emun": TEMPLATE_PROCESS_TYPE},
+        "process_type": {"enum": TEMPLATE_PROCESS_TYPE},
         "content": {"type": "string"},
         "subject": {"type": "string"},
         "created_by": uuid,
@@ -28,3 +28,24 @@ post_create_template_schema = {
     "then": {"required": ["subject"]},
     "required": ["name", "template_type", "content", "service", "created_by"]
 }
+
+post_update_template_schema = {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "description": "POST update existing template",
+    "type": "object",
+    "title": "payload for POST /service/<uuid:service_id>/template/<uuid:template_id>",
+    "properties": {
+        "id": uuid,
+        "name": {"type": "string"},
+        "template_type": {"enum": TEMPLATE_TYPES},
+        "service": uuid,
+        "process_type": {"enum": TEMPLATE_PROCESS_TYPE},
+        "content": {"type": "string"},
+        "subject": {"type": "string"},
+        "postage": {"type": "string", "format": "postage"},
+        "reply_to": nullable_uuid,
+        "created_by": uuid,
+        "archived": {"type": "boolean"},
+        "current_user": uuid
+    },
+}

tests/app/template/test_rest.py

@@ -884,6 +884,19 @@ def test_update_template_reply_to_set_to_blank(client, notify_db_session):
     assert th.service_letter_contact_id is None
 
 
+def test_update_template_validates_postage(admin_request, sample_service_full_permissions):
+    template = create_template(service=sample_service_full_permissions, template_type='letter')
+
+    response = admin_request.post(
+        'template.update_template',
+        service_id=sample_service_full_permissions.id,
+        template_id=template.id,
+        _data={"postage": "third"},
+        _expected_status=400
+    )
+    assert 'postage invalid' in response['errors'][0]['message']
+
+
 def test_update_template_with_foreign_service_reply_to(client, sample_letter_template):
     auth_header = create_authorization_header()