[fix] calculator: use locale from UI (not from selected language)

Closes: https://github.com/searxng/searxng/issues/3956
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

3 files changed, 64 insertions, 42 deletions

diff --git a/searx/plugins/calculator.py b/searx/plugins/calculator.py
index 403b04d57..e92ff9d91 100644
--- a/searx/plugins/calculator.py
+++ b/searx/plugins/calculator.py
@@ -8,7 +8,8 @@ import operator
 from multiprocessing import Process, Queue
 from typing import Callable
 
-import babel.numbers
+import flask
+import babel
 from flask_babel import gettext
 
 from searx.plugins import logger
@@ -100,14 +101,17 @@ def post_search(_request, search):
     # replace commonly used math operators with their proper Python operator
     query = query.replace("x", "*").replace(":", "/")
 
+    # use UI language
+    ui_locale = babel.Locale.parse(flask.request.preferences.get_value('locale'), sep='-')
+
     # parse the number system in a localized way
     def _decimal(match: re.Match) -> str:
         val = match.string[match.start() : match.end()]
-        val = babel.numbers.parse_decimal(val, search.search_query.locale, numbering_system="latn")
+        val = babel.numbers.parse_decimal(val, ui_locale, numbering_system="latn")
         return str(val)
 
-    decimal = search.search_query.locale.number_symbols["latn"]["decimal"]
-    group = search.search_query.locale.number_symbols["latn"]["group"]
+    decimal = ui_locale.number_symbols["latn"]["decimal"]
+    group = ui_locale.number_symbols["latn"]["group"]
     query = re.sub(f"[0-9]+[{decimal}|{group}][0-9]+[{decimal}|{group}]?[0-9]?", _decimal, query)
 
     # only numbers and math operators are accepted
@@ -121,6 +125,6 @@ def post_search(_request, search):
     result = timeout_func(0.05, _eval_expr, query_py_formatted)
     if result is None or result == "":
         return True
-    result = babel.numbers.format_decimal(result, locale=search.search_query.locale)
+    result = babel.numbers.format_decimal(result, locale=ui_locale)
     search.result_container.answers['calculate'] = {'answer': f"{search.search_query.query} = {result}"}
     return True
diff --git a/searx/webapp.py b/searx/webapp.py
index 19c477794..d2d486d20 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -517,7 +517,7 @@ def pre_request():
         preferences.parse_dict({"language": language})
         logger.debug('set language %s (from browser)', preferences.get_value("language"))
 
-    # locale is defined neither in settings nor in preferences
+    # UI locale is defined neither in settings nor in preferences
     # use browser headers
     if not preferences.get_value("locale"):
         locale = _get_browser_language(request, LOCALE_NAMES.keys())
diff --git a/tests/unit/test_plugin_calculator.py b/tests/unit/test_plugin_calculator.py
index 062624f03..caca0dfe2 100644
--- a/tests/unit/test_plugin_calculator.py
+++ b/tests/unit/test_plugin_calculator.py
@@ -1,9 +1,10 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # pylint: disable=missing-module-docstring
 
-from mock import Mock
+import flask
 from parameterized.parameterized import parameterized
 from searx import plugins
+from searx import preferences
 from tests import SearxTestCase
 from .test_utils import random_string
 
@@ -11,63 +12,78 @@ from .test_plugins import get_search_mock
 
 
 class PluginCalculator(SearxTestCase):  # pylint: disable=missing-class-docstring
+
     def setUp(self):
+        from searx import webapp  # pylint: disable=import-outside-toplevel
+
+        self.webapp = webapp
         self.store = plugins.PluginStore()
         plugin = plugins.load_and_initialize_plugin('searx.plugins.calculator', False, (None, {}))
         self.store.register(plugin)
+        self.preferences = preferences.Preferences(["simple"], ["general"], {}, self.store)
+        self.preferences.parse_dict({"locale": "en"})
 
     def test_plugin_store_init(self):
         self.assertEqual(1, len(self.store.plugins))
 
     def test_single_page_number_true(self):
-        request = Mock(remote_addr='127.0.0.1')
-        search = get_search_mock(query=random_string(10), pageno=2)
-        result = self.store.call(self.store.plugins, 'post_search', request, search)
+        with self.webapp.app.test_request_context():
+            flask.request.preferences = self.preferences
+            search = get_search_mock(query=random_string(10), pageno=2)
+            result = self.store.call(self.store.plugins, 'post_search', flask.request, search)
+
         self.assertTrue(result)
         self.assertNotIn('calculate', search.result_container.answers)
 
     def test_long_query_true(self):
-        request = Mock(remote_addr='127.0.0.1')
-        search = get_search_mock(query=random_string(101), pageno=1)
-        result = self.store.call(self.store.plugins, 'post_search', request, search)
+        with self.webapp.app.test_request_context():
+            flask.request.preferences = self.preferences
+            search = get_search_mock(query=random_string(101), pageno=1)
+            result = self.store.call(self.store.plugins, 'post_search', flask.request, search)
+
         self.assertTrue(result)
         self.assertNotIn('calculate', search.result_container.answers)
 
     def test_alpha_true(self):
-        request = Mock(remote_addr='127.0.0.1')
-        search = get_search_mock(query=random_string(10), pageno=1)
-        result = self.store.call(self.store.plugins, 'post_search', request, search)
+        with self.webapp.app.test_request_context():
+            flask.request.preferences = self.preferences
+            search = get_search_mock(query=random_string(10), pageno=1)
+            result = self.store.call(self.store.plugins, 'post_search', flask.request, search)
+
         self.assertTrue(result)
         self.assertNotIn('calculate', search.result_container.answers)
 
     @parameterized.expand(
         [
-            ("1+1", "2", "en-US"),
-            ("1-1", "0", "en-US"),
-            ("1*1", "1", "en-US"),
-            ("1/1", "1", "en-US"),
-            ("1**1", "1", "en-US"),
-            ("1^1", "1", "en-US"),
-            ("1,000.0+1,000.0", "2,000", "en-US"),
-            ("1.0+1.0", "2", "en-US"),
-            ("1.0-1.0", "0", "en-US"),
-            ("1.0*1.0", "1", "en-US"),
-            ("1.0/1.0", "1", "en-US"),
-            ("1.0**1.0", "1", "en-US"),
-            ("1.0^1.0", "1", "en-US"),
-            ("1.000,0+1.000,0", "2.000", "de-DE"),
-            ("1,0+1,0", "2", "de-DE"),
-            ("1,0-1,0", "0", "de-DE"),
-            ("1,0*1,0", "1", "de-DE"),
-            ("1,0/1,0", "1", "de-DE"),
-            ("1,0**1,0", "1", "de-DE"),
-            ("1,0^1,0", "1", "de-DE"),
+            ("1+1", "2", "en"),
+            ("1-1", "0", "en"),
+            ("1*1", "1", "en"),
+            ("1/1", "1", "en"),
+            ("1**1", "1", "en"),
+            ("1^1", "1", "en"),
+            ("1,000.0+1,000.0", "2,000", "en"),
+            ("1.0+1.0", "2", "en"),
+            ("1.0-1.0", "0", "en"),
+            ("1.0*1.0", "1", "en"),
+            ("1.0/1.0", "1", "en"),
+            ("1.0**1.0", "1", "en"),
+            ("1.0^1.0", "1", "en"),
+            ("1.000,0+1.000,0", "2.000", "de"),
+            ("1,0+1,0", "2", "de"),
+            ("1,0-1,0", "0", "de"),
+            ("1,0*1,0", "1", "de"),
+            ("1,0/1,0", "1", "de"),
+            ("1,0**1,0", "1", "de"),
+            ("1,0^1,0", "1", "de"),
         ]
     )
     def test_localized_query(self, operation: str, contains_result: str, lang: str):
-        request = Mock(remote_addr='127.0.0.1')
-        search = get_search_mock(query=operation, lang=lang, pageno=1)
-        result = self.store.call(self.store.plugins, 'post_search', request, search)
+        with self.webapp.app.test_request_context():
+            self.preferences.parse_dict({"locale": lang})
+            flask.request.preferences = self.preferences
+            search = get_search_mock(query=operation, lang=lang, pageno=1)
+            result = self.store.call(self.store.plugins, 'post_search', flask.request, search)
+
         self.assertTrue(result)
         self.assertIn('calculate', search.result_container.answers)
         self.assertIn(contains_result, search.result_container.answers['calculate']['answer'])
@@ -78,8 +94,10 @@ class PluginCalculator(SearxTestCase):  # pylint: disable=missing-class-docstrin
         ]
     )
     def test_invalid_operations(self, operation):
-        request = Mock(remote_addr='127.0.0.1')
-        search = get_search_mock(query=operation, pageno=1)
-        result = self.store.call(self.store.plugins, 'post_search', request, search)
+        with self.webapp.app.test_request_context():
+            flask.request.preferences = self.preferences
+            search = get_search_mock(query=operation, pageno=1)
+            result = self.store.call(self.store.plugins, 'post_search', flask.request, search)
+
         self.assertTrue(result)
         self.assertNotIn('calculate', search.result_container.answers)