add api for fetching timezones (#1959)

SDCP-279

features/locales.feature

@@ -0,0 +1,16 @@
+Feature: Localization
+
+    @auth
+    Scenario: Get timezones
+
+        When we get "/locales/timezones"
+        Then we get existing resource
+        """
+        {"timezones": [
+            {
+                "id": "America/Edmonton",
+                "name": "Mountain Time",
+                "location": "Canada (Edmonton) Time"
+            }
+        ]}
+        """

superdesk/default_settings.py

@@ -370,6 +370,7 @@ def local_to_utc_hour(hour):
     'superdesk.attachments',
     'superdesk.auth_server',
     'apps.links',
+    'superdesk.locales',
 ]
 
 #: Specify what modules should be enabled

superdesk/locales.py

@@ -0,0 +1,31 @@
+
+import pytz
+import flask
+import babel.dates as dates
+
+from apps.auth import get_user
+
+
+bp = flask.Blueprint('locales', __name__)
+
+
+@bp.route('/locales/timezones')
+def locales_view():
+    if not flask.current_app.auth.authorized([], 'locales', 'GET'):
+        flask.abort(401)
+    user = get_user()
+    lang = user.get('language', flask.current_app.config.get('DEFAULT_LANGUAGE', 'en')).replace('-', '_')
+    return flask.jsonify({
+        'timezones': [
+            {
+                'id': tz,
+                'name': dates.get_timezone_name(tz, locale=lang),
+                'location': dates.get_timezone_location(tz, locale=lang),
+            } for tz in pytz.common_timezones
+        ]
+    })
+
+
+def init_app(app):
+    bp.url_prefix = '/{}'.format(app.config['URL_PREFIX'].lstrip('/'))
+    app.register_blueprint(bp)