[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  The old API suggestqueries.google.com/complete has been replaced
  by the async REST API: https://{subdomain}/complete/search?{args}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>

1 files changed, 32 insertions, 83 deletions

diff --git a/searx/engines/google_videos.py b/searx/engines/google_videos.py
index 5ab29f9ff..985189df5 100644
--- a/searx/engines/google_videos.py
+++ b/searx/engines/google_videos.py
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # lint: pylint
-"""This is the implementation of the google videos engine.
+"""This is the implementation of the Google Videos engine.
 
 .. admonition:: Content-Security-Policy (CSP)
 
@@ -14,9 +14,8 @@
 
 """
 
-# pylint: disable=invalid-name
+from typing import TYPE_CHECKING
 
-import re
 from urllib.parse import urlencode
 from lxml import html
 
@@ -27,20 +26,22 @@ from searx.utils import (
     extract_text,
 )
 
+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,
     filter_mapping,
-    g_section_with_header,
-    title_xpath,
     suggestion_xpath,
     detect_google_sorry,
 )
+from searx.enginelib.traits import EngineTraits
 
-# pylint: disable=unused-import
-from searx.engines.google import supported_languages_url, _fetch_supported_languages, fetch_traits
+if TYPE_CHECKING:
+    import logging
 
-# pylint: enable=unused-import
+    logger: logging.Logger
+
+traits: EngineTraits
 
 # about
 about = {
@@ -55,70 +56,32 @@ about = {
 # engine dependent config
 
 categories = ['videos', 'web']
-paging = False
+paging = True
 language_support = True
-use_locale_domain = True
 time_range_support = True
 safesearch = True
-send_accept_language_header = True
-
-RE_CACHE = {}
-
-
-def _re(regexpr):
-    """returns compiled regular expression"""
-    RE_CACHE[regexpr] = RE_CACHE.get(regexpr, re.compile(regexpr))
-    return RE_CACHE[regexpr]
-
-
-def scrap_out_thumbs_src(dom):
-    ret_val = {}
-    thumb_name = 'dimg_'
-    for script in eval_xpath_list(dom, '//script[contains(., "google.ldi={")]'):
-        _script = script.text
-        # "dimg_35":"https://i.ytimg.c....",
-        _dimurl = _re("s='([^']*)").findall(_script)
-        for k, v in _re('(' + thumb_name + '[0-9]*)":"(http[^"]*)').findall(_script):
-            v = v.replace(r'\u003d', '=')
-            v = v.replace(r'\u0026', '&')
-            ret_val[k] = v
-    logger.debug("found %s imgdata for: %s", thumb_name, ret_val.keys())
-    return ret_val
-
-
-def scrap_out_thumbs(dom):
-    """Scrap out thumbnail data from <script> tags."""
-    ret_val = {}
-    thumb_name = 'dimg_'
-
-    for script in eval_xpath_list(dom, '//script[contains(., "_setImagesSrc")]'):
-        _script = script.text
-
-        # var s='data:image/jpeg;base64, ...'
-        _imgdata = _re("s='([^']*)").findall(_script)
-        if not _imgdata:
-            continue
-
-        # var ii=['dimg_17']
-        for _vidthumb in _re(r"(%s\d+)" % thumb_name).findall(_script):
-            # At least the equal sign in the URL needs to be decoded
-            ret_val[_vidthumb] = _imgdata[0].replace(r"\x3d", "=")
-
-    logger.debug("found %s imgdata for: %s", thumb_name, ret_val.keys())
-    return ret_val
 
 
 def request(query, params):
     """Google-Video 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': "vid", **lang_info['params'], 'ie': "utf8", 'oe': "utf8"})
+        + urlencode(
+            {
+                'q': query,
+                'tbm': "vid",
+                'start': 10 * params['pageno'],
+                **google_info['params'],
+                'asearch': 'arc',
+                'async': 'use_ac:true,_fmt:html',
+            }
+        )
     )
 
     if params['time_range'] in time_range_dict:
@@ -127,9 +90,8 @@ def request(query, params):
         query_url += '&' + urlencode({'safe': filter_mapping[params['safesearch']]})
     params['url'] = query_url
 
-    params['cookies']['CONSENT'] = "YES+"
-    params['headers'].update(lang_info['headers'])
-    params['headers']['Accept'] = 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
+    params['cookies'] = google_info['cookies']
+    params['headers'].update(google_info['headers'])
     return params
 
 
@@ -141,43 +103,30 @@ def response(resp):
 
     # convert the text to dom
     dom = html.fromstring(resp.text)
-    vidthumb_imgdata = scrap_out_thumbs(dom)
-    thumbs_src = scrap_out_thumbs_src(dom)
-    logger.debug(str(thumbs_src))
 
     # parse results
     for result in eval_xpath_list(dom, '//div[contains(@class, "g ")]'):
 
-        # ignore google *sections*
-        if extract_text(eval_xpath(result, g_section_with_header)):
-            logger.debug("ignoring <g-section-with-header>")
-            continue
-
-        # ingnore articles without an image id / e.g. news articles
-        img_id = eval_xpath_getindex(result, './/g-img/img/@id', 0, default=None)
-        if img_id is None:
-            logger.error("no img_id found in item %s (news article?)", len(results) + 1)
+        img_src = eval_xpath_getindex(result, './/img/@src', 0, None)
+        if img_src is None:
             continue
 
-        img_src = vidthumb_imgdata.get(img_id, None)
-        if not img_src:
-            img_src = thumbs_src.get(img_id, "")
+        title = extract_text(eval_xpath_getindex(result, './/a/h3[1]', 0))
+        url = eval_xpath_getindex(result, './/a/h3[1]/../@href', 0)
 
-        title = extract_text(eval_xpath_getindex(result, title_xpath, 0))
-        url = eval_xpath_getindex(result, './/div[@class="dXiKIc"]//a/@href', 0)
-        length = extract_text(eval_xpath(result, './/div[contains(@class, "P7xzyf")]/span/span'))
         c_node = eval_xpath_getindex(result, './/div[@class="Uroaid"]', 0)
         content = extract_text(c_node)
-        pub_info = extract_text(eval_xpath(result, './/div[@class="Zg1NU"]'))
+        pub_info = extract_text(eval_xpath(result, './/div[@class="P7xzyf"]'))
+        length = extract_text(eval_xpath(result, './/div[@class="J1mWY"]'))
 
         results.append(
             {
                 'url': url,
                 'title': title,
                 'content': content,
-                'length': length,
                 'author': pub_info,
                 'thumbnail': img_src,
+                'length': length,
                 'template': 'videos.html',
             }
         )