[feat] engine ChinaSo: support source filter for ChinaSo-News

* filtering ChinaSo-News results by source, option ``chinaso_news_source``
* add ChinaSo engine to the online docs https://docs.searxng.org/dev/engines/online/chinaso.html
* fix SearXNG categories in the settings.yml
* deactivate ChinaSo engines ``inactive: true`` until [1] is fixed
* configure network of the ChinaSo engines

[1] https://github.com/searxng/searxng/issues/4694

Signed-off-by: @BrandonStudio
Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/chinaso.py

@@ -1,5 +1,60 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""ChinaSo: A search engine from ChinaSo."""
+"""ChinaSo_, a search engine for the chinese language area.
+
+.. attention::
+
+   ChinaSo engine does not return real URL, the links from these search
+   engines violate the privacy of the users!!
+
+   We try to find a solution for this problem, please follow `issue #4694`_.
+
+   As long as the problem has not been resolved, these engines are
+   not active in a standard setup (``inactive: true``).
+
+.. _ChinaSo: https://www.chinaso.com/
+.. _issue #4694: https://github.com/searxng/searxng/issues/4694
+
+Configuration
+=============
+
+The engine has the following additional settings:
+
+- :py:obj:`chinaso_category` (:py:obj:`ChinasoCategoryType`)
+- :py:obj:`chinaso_news_source` (:py:obj:`ChinasoNewsSourceType`)
+
+In the example below, all three ChinaSO engines are using the :ref:`network
+<engine network>` from the ``chinaso news`` engine.
+
+.. code:: yaml
+
+   - name: chinaso news
+     engine: chinaso
+     shortcut: chinaso
+     categories: [news]
+     chinaso_category: news
+     chinaso_news_source: all
+
+   - name: chinaso images
+     engine: chinaso
+     network: chinaso news
+     shortcut: chinasoi
+     categories: [images]
+     chinaso_category: images
+
+   - name: chinaso videos
+     engine: chinaso
+     network: chinaso news
+     shortcut: chinasov
+     categories: [videos]
+     chinaso_category: videos
+
+
+Implementations
+===============
+
+"""
+
+import typing
 
 from urllib.parse import urlencode
 from datetime import datetime
@@ -20,13 +75,31 @@ paging = True
 time_range_support = True
 results_per_page = 10
 categories = []
-chinaso_category = 'news'
+
+ChinasoCategoryType = typing.Literal['news', 'videos', 'images']
 """ChinaSo supports news, videos, images search.
 
 - ``news``: search for news
 - ``videos``: search for videos
 - ``images``: search for images
+
+In the category ``news`` you can additionally filter by option
+:py:obj:`chinaso_news_source`.
 """
+chinaso_category = 'news'
+"""Configure ChinaSo category (:py:obj:`ChinasoCategoryType`)."""
+
+ChinasoNewsSourceType = typing.Literal['CENTRAL', 'LOCAL', 'BUSINESS', 'EPAPER', 'all']
+"""Filtering ChinaSo-News results by source:
+
+- ``CENTRAL``: central publication
+- ``LOCAL``: local publication
+- ``BUSINESS``: business publication
+- ``EPAPER``: E-Paper
+- ``all``: all sources
+"""
+chinaso_news_source: ChinasoNewsSourceType = 'all'
+"""Configure ChinaSo-News type (:py:obj:`ChinasoNewsSourceType`)."""
 
 time_range_dict = {'day': '24h', 'week': '1w', 'month': '1m', 'year': '1y'}
 
@@ -35,7 +108,9 @@ base_url = "https://www.chinaso.com"
 
 def init(_):
     if chinaso_category not in ('news', 'videos', 'images'):
-        raise SearxEngineAPIException(f"Unsupported category: {chinaso_category}")
+        raise ValueError(f"Unsupported category: {chinaso_category}")
+    if chinaso_category == 'news' and chinaso_news_source not in typing.get_args(ChinasoNewsSourceType):
+        raise ValueError(f"Unsupported news source: {chinaso_news_source}")
 
 
 def request(query, params):
@@ -56,6 +131,11 @@ def request(query, params):
             'params': {'start_index': (params["pageno"] - 1) * results_per_page, 'rn': results_per_page},
         },
     }
+    if chinaso_news_source != 'all':
+        if chinaso_news_source == 'EPAPER':
+            category_config['news']['params']["type"] = 'EPAPER'
+        else:
+            category_config['news']['params']["cate"] = chinaso_news_source
 
     query_params.update(category_config[chinaso_category]['params'])