[mod] Google: reversed engineered & upgrade to data_type: traits_v1

Partial reverse engineering of the Google engines including a improved language
and region handling based on the engine.traits_v1 data.

When ever possible the implementations of the Google engines try to make use of
the async REST APIs.  The get_lang_info() has been generalized to a
get_google_info() function / especially the region handling has been improved by
adding the cr parameter.

searx/data/engine_traits.json
  Add data type "traits_v1" generated by the fetch_traits() functions from:

  - Google (WEB),
  - Google images,
  - Google news,
  - Google scholar and
  - Google videos

  and remove data from obsolete data type "supported_languages".

  A traits.custom type that maps region codes to *supported_domains* is fetched
  from https://www.google.com/supported_domains

searx/autocomplete.py:
  Reversed engineered autocomplete from Google WEB.  Supports Google's languages and
  subdomains.  The old API suggestqueries.google.com/complete has been replaced
  by the async REST API: https://{subdomain}/complete/search?{args}

searx/engines/google.py
  Reverse engineering and extensive testing ..
  - fetch_traits():  Fetch languages & regions from Google properties.
  - always use the async REST API (formally known as 'use_mobile_ui')
  - use *supported_domains* from traits
  - improved the result list by fetching './/div[@data-content-feature]'
    and parsing the type of the various *content features* --> thumbnails are
    added

searx/engines/google_images.py
  Reverse engineering and extensive testing ..
  - fetch_traits():  Fetch languages & regions from Google properties.
  - use *supported_domains* from traits
  - if exists, freshness_date is added to the result
  - issue 1864: result list has been improved a lot (due to the new cr parameter)

searx/engines/google_news.py
  Reverse engineering and extensive testing ..
  - fetch_traits():  Fetch languages & regions from Google properties.
    *supported_domains* is not needed but a ceid list has been added.
  - different region handling compared to Google WEB
  - fixed for various languages & regions (due to the new ceid parameter) /
    avoid CONSENT page
  - Google News do no longer support time range
  - result list has been fixed: XPath of pub_date and pub_origin

searx/engines/google_videos.py
  - fetch_traits():  Fetch languages & regions from Google properties.
  - use *supported_domains* from traits
  - add paging support
  - implement a async request ('asearch': 'arc' & 'async':
    'use_ac:true,_fmt:html')
  - simplified code (thanks to '_fmt:html' request)
  - issue 1359: fixed xpath of video length data

searx/engines/google_scholar.py
  - fetch_traits():  Fetch languages & regions from Google properties.
  - use *supported_domains* from traits
  - request(): include patents & citations
  - response(): fixed CAPTCHA detection (Scholar has its own CATCHA manager)
  - hardening XPath to iterate over results
  - fixed XPath of pub_type (has been change from gs_ct1 to gs_cgt2 class)
  - issue 1769 fixed: new request implementation is no longer incompatible

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

searx/engines/google_images.py

@@ -1,31 +1,38 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # lint: pylint
-"""This is the implementation of the google images engine using the google
-internal API used the Google Go Android app.
+"""This is the implementation of the Google Images engine using the internal
+Google API used by the Google Go Android app.
 
 This internal API offer results in
 
-- JSON (_fmt:json)
-- Protobuf (_fmt:pb)
-- Protobuf compressed? (_fmt:pc)
-- HTML (_fmt:html)
-- Protobuf encoded in JSON (_fmt:jspb).
+- JSON (``_fmt:json``)
+- Protobuf_ (``_fmt:pb``)
+- Protobuf_ compressed? (``_fmt:pc``)
+- HTML (``_fmt:html``)
+- Protobuf_ encoded in JSON (``_fmt:jspb``).
 
+.. _Protobuf: https://en.wikipedia.org/wiki/Protocol_Buffers
 """
 
+from typing import TYPE_CHECKING
+
 from urllib.parse import urlencode
 from json import loads
 
+from searx.engines.google import fetch_traits  # pylint: disable=unused-import
 from searx.engines.google import (
-    get_lang_info,
+    get_google_info,
     time_range_dict,
     detect_google_sorry,
 )
 
-# pylint: disable=unused-import
-from searx.engines.google import supported_languages_url, _fetch_supported_languages, fetch_traits
+if TYPE_CHECKING:
+    import logging
+    from searx.enginelib.traits import EngineTraits
+
+    logger: logging.Logger
+    traits: EngineTraits
 
-# pylint: enable=unused-import
 
 # about
 about = {
@@ -40,7 +47,6 @@ about = {
 # engine dependent config
 categories = ['images', 'web']
 paging = True
-use_locale_domain = True
 time_range_support = True
 safesearch = True
 send_accept_language_header = True
@@ -51,20 +57,18 @@ filter_mapping = {0: 'images', 1: 'active', 2: 'active'}
 def request(query, params):
     """Google-Image search request"""
 
-    lang_info = get_lang_info(params, supported_languages, language_aliases, False)
+    google_info = get_google_info(params, traits)
 
     query_url = (
         'https://'
-        + lang_info['subdomain']
+        + google_info['subdomain']
         + '/search'
         + "?"
         + urlencode(
             {
                 'q': query,
                 'tbm': "isch",
-                **lang_info['params'],
-                'ie': "utf8",
-                'oe': "utf8",
+                **google_info['params'],
                 'asearch': 'isch',
                 'async': '_fmt:json,p:1,ijn:' + str(params['pageno']),
             }
@@ -77,9 +81,8 @@ def request(query, params):
         query_url += '&' + urlencode({'safe': filter_mapping[params['safesearch']]})
     params['url'] = query_url
 
-    params['headers'].update(lang_info['headers'])
-    params['headers']['User-Agent'] = 'NSTN/3.60.474802233.release Dalvik/2.1.0 (Linux; U; Android 12; US) gzip'
-    params['headers']['Accept'] = '*/*'
+    params['cookies'] = google_info['cookies']
+    params['headers'].update(google_info['headers'])
     return params
 
 
@@ -111,7 +114,11 @@ def response(resp):
 
         copyright_notice = item["result"].get('iptc', {}).get('copyright_notice')
         if copyright_notice:
-            result_item['source'] += ' / ' + copyright_notice
+            result_item['source'] += ' | ' + copyright_notice
+
+        freshness_date = item["result"].get("freshness_date")
+        if freshness_date:
+            result_item['source'] += ' | ' + freshness_date
 
         file_size = item.get('gsa', {}).get('file_size')
         if file_size: