[enh] engine: mojeek - add language support

Improve region and language detection / all locale

Testing has shown the following behaviour for the different
default and empty values of Mojeeks parameters:

| param    | idx | value  | behaviour                 |
| -------- | --- | ------ | ------------------------- |
| region   |  0  | ''     | detect region based on IP |
| region   |  1  | 'none' | all regions               |
| language |  0  | ''     | all languages             |

searx/engines/mojeek.py

@@ -1,12 +1,15 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 """Mojeek (general, images, news)"""
 
+from typing import TYPE_CHECKING
+
 from datetime import datetime
 from urllib.parse import urlencode
 from lxml import html
 
 from dateutil.relativedelta import relativedelta
 from searx.utils import eval_xpath, eval_xpath_list, extract_text
+from searx.enginelib.traits import EngineTraits
 
 about = {
     'website': 'https://mojeek.com',
@@ -42,6 +45,18 @@ news_url_xpath = './/h2/a/@href'
 news_title_xpath = './/h2/a'
 news_content_xpath = './/p[@class="s"]'
 
+language_param = 'lb'
+region_param = 'arc'
+
+_delta_kwargs = {'day': 'days', 'week': 'weeks', 'month': 'months', 'year': 'years'}
+
+if TYPE_CHECKING:
+    import logging
+
+    logger = logging.getLogger()
+
+traits: EngineTraits
+
 
 def init(_):
     if search_type not in ('', 'images', 'news'):
@@ -53,13 +68,16 @@ def request(query, params):
         'q': query,
         'safe': min(params['safesearch'], 1),
         'fmt': search_type,
+        language_param: traits.get_language(params['searxng_locale'], traits.custom['language_all']),
+        region_param: traits.get_region(params['searxng_locale'], traits.custom['region_all']),
     }
 
     if search_type == '':
         args['s'] = 10 * (params['pageno'] - 1)
 
     if params['time_range'] and search_type != 'images':
-        args["since"] = (datetime.now() - relativedelta(**{f"{params['time_range']}s": 1})).strftime("%Y%m%d")
+        kwargs = {_delta_kwargs[params['time_range']]: 1}
+        args["since"] = (datetime.now() - relativedelta(**kwargs)).strftime("%Y%m%d")  # type: ignore
         logger.debug(args["since"])
 
     params['url'] = f"{base_url}/search?{urlencode(args)}"
@@ -94,7 +112,7 @@ def _image_results(dom):
                 'template': 'images.html',
                 'url': extract_text(eval_xpath(result, image_url_xpath)),
                 'title': extract_text(eval_xpath(result, image_title_xpath)),
-                'img_src': base_url + extract_text(eval_xpath(result, image_img_src_xpath)),
+                'img_src': base_url + extract_text(eval_xpath(result, image_img_src_xpath)),  # type: ignore
                 'content': '',
             }
         )
@@ -130,3 +148,31 @@ def response(resp):
         return _news_results(dom)
 
     raise ValueError(f"Invalid search type {search_type}")
+
+
+def fetch_traits(engine_traits: EngineTraits):
+    # pylint: disable=import-outside-toplevel
+    from searx import network
+    from searx.locales import get_official_locales, region_tag
+    from babel import Locale, UnknownLocaleError
+    import contextlib
+
+    resp = network.get(base_url + "/preferences", headers={'Accept-Language': 'en-US,en;q=0.5'})
+    dom = html.fromstring(resp.text)  # type: ignore
+
+    languages = eval_xpath_list(dom, f'//select[@name="{language_param}"]/option/@value')
+
+    engine_traits.custom['language_all'] = languages[0]
+
+    for code in languages[1:]:
+        with contextlib.suppress(UnknownLocaleError):
+            locale = Locale(code)
+            engine_traits.languages[locale.language] = code
+
+    regions = eval_xpath_list(dom, f'//select[@name="{region_param}"]/option/@value')
+
+    engine_traits.custom['region_all'] = regions[1]
+
+    for code in regions[2:]:
+        for locale in get_official_locales(code, engine_traits.languages):
+            engine_traits.regions[region_tag(locale)] = code

searxng_extra/update/update_engine_traits.py

@@ -101,7 +101,7 @@ def fetch_traits_map():
 def filter_locales(traits_map: EngineTraitsMap):
     """Filter language & region tags by a threshold."""
 
-    min_eng_per_region = 15
+    min_eng_per_region = 18
     min_eng_per_lang = 20
 
     _ = {}

tests/unit/test_locales.py

@@ -32,12 +32,10 @@ class TestLocales(SearxTestCase):
 
     @parameterized.expand(
         [
-            ('ca-es', 'ca-ES'),
             ('de-at', 'de-AT'),
             ('de-de', 'de-DE'),
             ('en-UK', 'en-GB'),
             ('fr-be', 'fr-BE'),
-            ('fr-be', 'fr-BE'),
             ('fr-ca', 'fr-CA'),
             ('fr-ch', 'fr-CH'),
             ('zh-cn', 'zh-CN'),