Handle HTTPError from API and routing errors from flask.

Removed catching the HTTPError where applicable.

app/__init__.py

@@ -7,10 +7,11 @@ from flask._compat import string_types
 from flask_login import LoginManager
 from flask_wtf import CsrfProtect
 from notifications_python_client import HTTPError
-from werkzeug.exceptions import abort
 from pygments import highlight
 from pygments.lexers import JavascriptLexer
 from pygments.formatters import HtmlFormatter
+from werkzeug.exceptions import abort
+
 from app.notify_client.api_client import NotificationsAdminAPIClient
 from app.notify_client.api_key_api_client import ApiKeyApiClient
 from app.notify_client.user_api_client import UserApiClient
@@ -177,10 +178,33 @@ def useful_headers_after_request(response):
 
 
 def register_errorhandlers(application):
+    def _error_response(error_code):
+        resp = make_response(render_template("error/{0}.html".format(error_code)), error_code)
+        return useful_headers_after_request(resp)
+
     @application.errorhandler(HTTPError)
     def render_http_error(error):
         error_code = getattr(error, 'code', 500)
         if error_code not in [401, 404, 403, 500]:
             error_code = 500
-        resp = make_response(render_template("error/{0}.html".format(error_code)), error_code)
-        return useful_headers_after_request(resp)
+        return _error_response(error_code)
+
+    @application.errorhandler(400)
+    def handle_bad_request(error):
+        return _error_response(404)
+
+    @application.errorhandler(404)
+    def handle_not_found(error):
+        return _error_response(404)
+
+    @application.errorhandler(403)
+    def handle_not_authorized(error):
+        return _error_response(403)
+
+    @application.errorhandler(401)
+    def handle_no_permissions(error):
+        return _error_response(401)
+
+    @application.errorhandler(Exception)
+    def handle_bad_request(error):
+        return _error_response(500)

app/main/dao/templates_dao.py

@@ -19,10 +19,7 @@ def get_service_templates(service_id):
 
 
 def get_service_template_or_404(service_id, template_id):
-    try:
-        return notifications_api_client.get_service_template(service_id, template_id)
-    except HTTPError as e:
-        abort(e.status_code)
+    return notifications_api_client.get_service_template(service_id, template_id)
 
 
 def delete_service_template(service_id, template_id):

app/main/dao/users_dao.py

@@ -1,11 +1,6 @@
-from datetime import datetime
 from notifications_python_client import HTTPError
 
-from sqlalchemy.orm import load_only
-
 from app import login_manager
-from app.main.encryption import hashpw
-
 from app import user_api_client
 
 #

app/main/views/dashboard.py

@@ -9,7 +9,6 @@ from flask_login import login_required
 from app.main import main
 from app.main.dao.services_dao import get_service_by_id
 from app.main.dao import templates_dao
-from notifications_python_client.errors import HTTPError
 from app import job_api_client
 
 

app/main/views/jobs.py

@@ -8,7 +8,6 @@ from flask import (
     jsonify
 )
 from flask_login import login_required
-from notifications_python_client.errors import HTTPError
 from utils.template import Template
 
 from app import job_api_client, notification_api_client