[fix] revise of the google-news engine

This revise is based on the methods developed in the revise of the google engine
(see commit 410c2f9).

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

3 files changed, 170 insertions, 73 deletions

diff --git a/searx/engines/google.py b/searx/engines/google.py
index 4198de640..fe9cd63e0 100644
--- a/searx/engines/google.py
+++ b/searx/engines/google.py
@@ -155,6 +155,11 @@ def get_lang_country(params, lang_list, custom_aliases):
 
     return language, country, lang_country
 
+def detect_google_sorry(resp):
+    resp_url = urlparse(resp.url)
+    if resp_url.netloc == 'sorry.google.com' or resp_url.path.startswith('/sorry'):
+        raise SearxEngineCaptchaException()
+
 
 def request(query, params):
     """Google search request"""
@@ -200,16 +205,10 @@ def request(query, params):
 
 def response(resp):
     """Get response from google's search request"""
-    results = []
 
-    # detect google sorry
-    resp_url = urlparse(resp.url)
-    if resp_url.netloc == 'sorry.google.com' or resp_url.path == '/sorry/IndexRedirect':
-        raise SearxEngineCaptchaException()
-
-    if resp_url.path.startswith('/sorry'):
-        raise SearxEngineCaptchaException()
+    detect_google_sorry(resp)
 
+    results = []
     # which subdomain ?
     # subdomain = resp.search_params.get('google_subdomain')
 
diff --git a/searx/engines/google_images.py b/searx/engines/google_images.py
index 8c2cb9d2a..612682c44 100644
--- a/searx/engines/google_images.py
+++ b/searx/engines/google_images.py
@@ -12,10 +12,9 @@ Definitions`_.
      Header set Content-Security-Policy "img-src 'self' data: ;"
 """
 
-from urllib.parse import urlencode, urlparse, unquote
+from urllib.parse import urlencode, unquote
 from lxml import html
 from searx import logger
-from searx.exceptions import SearxEngineCaptchaException
 from searx.utils import extract_text, eval_xpath
 from searx.engines.google import _fetch_supported_languages, supported_languages_url  # NOQA # pylint: disable=unused-import
 
@@ -23,6 +22,7 @@ from searx.engines.google import (
     get_lang_country,
     google_domains,
     time_range_dict,
+    detect_google_sorry,
 )
 
 logger = logger.getChild('google images')
@@ -123,13 +123,7 @@ def response(resp):
     """Get response from google's search request"""
     results = []
 
-    # detect google sorry
-    resp_url = urlparse(resp.url)
-    if resp_url.netloc == 'sorry.google.com' or resp_url.path == '/sorry/IndexRedirect':
-        raise SearxEngineCaptchaException()
-
-    if resp_url.path.startswith('/sorry'):
-        raise SearxEngineCaptchaException()
+    detect_google_sorry(resp)
 
     # which subdomain ?
     # subdomain = resp.search_params.get('google_subdomain')
diff --git a/searx/engines/google_news.py b/searx/engines/google_news.py
index 63fef6696..d04ff153b 100644
--- a/searx/engines/google_news.py
+++ b/searx/engines/google_news.py
@@ -1,12 +1,45 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""
- Google (News)
+"""Google (News)
+
+For detailed description of the *REST-full* API see: `Query Parameter
+Definitions`_.  Not all parameters can be appied, e.g. num_ (the number of
+search results to return) is ignored.
+
+.. _Query Parameter Definitions:
+   https://developers.google.com/custom-search/docs/xml_results#WebSearch_Query_Parameter_Definitions
+
+.. _num: https://developers.google.com/custom-search/docs/xml_results#numsp
+
 """
 
+# pylint: disable=invalid-name, missing-function-docstring
+
+import binascii
+import re
 from urllib.parse import urlencode
+from base64 import b64decode
 from lxml import html
-from searx.utils import match_language
-from searx.engines.google import _fetch_supported_languages, supported_languages_url  # NOQA # pylint: disable=unused-import
+
+from searx import logger
+from searx.utils import (
+    eval_xpath,
+    eval_xpath_list,
+    eval_xpath_getindex,
+    extract_text,
+)
+
+# pylint: disable=unused-import
+from searx.engines.google import (
+    supported_languages_url,
+    _fetch_supported_languages,
+    detect_google_sorry,
+)
+# pylint: enable=unused-import
+
+from searx.engines.google import (
+    get_lang_country,
+    filter_mapping,
+)
 
 # about
 about = {
@@ -18,72 +51,143 @@ about = {
     "results": 'HTML',
 }
 
-# search-url
+logger = logger.getChild('google news')
+
+# compared to other google engines google-news has a different time range
+# support.  The time range is included in the search term.
+time_range_dict = {
+    'day': 'when:1d',
+    'week': 'when:7d',
+    'month': 'when:1m',
+    'year': 'when:1y',
+}
+
+# engine dependent config
+
 categories = ['news']
-paging = True
+paging = False
 language_support = True
-safesearch = True
+use_locale_domain = True
 time_range_support = True
-number_of_results = 10
-
-search_url = 'https://www.google.com/search'\
-    '?{query}'\
-    '&tbm=nws'\
-    '&gws_rd=cr'\
-    '&{search_options}'
-time_range_attr = "qdr:{range}"
-time_range_dict = {'day': 'd',
-                   'week': 'w',
-                   'month': 'm',
-                   'year': 'y'}
-
+safesearch = True # not really, but it is not generated by google
 
-# do search-request
 def request(query, params):
-
-    search_options = {
-        'start': (params['pageno'] - 1) * number_of_results
-    }
-
-    if params['time_range'] in time_range_dict:
-        search_options['tbs'] = time_range_attr.format(range=time_range_dict[params['time_range']])
-
-    if safesearch and params['safesearch']:
-        search_options['safe'] = 'on'
-
-    params['url'] = search_url.format(query=urlencode({'q': query}),
-                                      search_options=urlencode(search_options))
-
-    if params['language'] != 'all':
-        language = match_language(params['language'], supported_languages, language_aliases).split('-')[0]
-        if language:
-            params['url'] += '&hl=' + language
+    """Google-News search request"""
+
+    language, country, lang_country = get_lang_country(
+        # pylint: disable=undefined-variable
+        params, supported_languages, language_aliases
+    )
+    subdomain = 'news.google.com'
+
+    if params['time_range']: # in time_range_dict:
+        query += ' ' + time_range_dict[params['time_range']]
+
+    query_url = 'https://'+ subdomain + '/search' + "?" + urlencode({
+        'q': query,
+        'hl': language,
+        'lr': "lang_" + language,
+        'ie': "utf8",
+        'oe': "utf8",
+        'ceid' : "%s:%s" % (country, language),
+        'gl' : country,
+    })
+
+    if params['safesearch']:
+        query_url += '&' + urlencode({'safe': filter_mapping[params['safesearch']]})
+
+    params['url'] = query_url
+    logger.debug("query_url --> %s", query_url)
+
+    # en-US,en;q=0.8,en;q=0.5
+    params['headers']['Accept-Language'] = (
+        lang_country + ',' + language + ';q=0.8,' + language + ';q=0.5'
+        )
+    logger.debug("HTTP header Accept-Language --> %s",
+                 params['headers']['Accept-Language'])
+    params['headers']['Accept'] = (
+        'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
+        )
+    #params['google_subdomain'] = subdomain
 
     return params
 
 
-# get response from search-request
 def response(resp):
+    """Get response from google's search request"""
     results = []
 
+    detect_google_sorry(resp)
+
+    # which subdomain ?
+    # subdomain = resp.search_params.get('google_subdomain')
+
+    # convert the text to dom
     dom = html.fromstring(resp.text)
 
-    # parse results
-    for result in dom.xpath('//div[@class="g"]|//div[@class="g _cy"]'):
-        try:
-            r = {
-                'url': result.xpath('.//a[@class="l lLrAF"]')[0].attrib.get("href"),
-                'title': ''.join(result.xpath('.//a[@class="l lLrAF"]//text()')),
-                'content': ''.join(result.xpath('.//div[@class="st"]//text()')),
-            }
-        except:
-            continue
-
-        imgs = result.xpath('.//img/@src')
-        if len(imgs) and not imgs[0].startswith('data'):
-            r['img_src'] = imgs[0]
-
-        results.append(r)
+    for result in eval_xpath_list(dom, '//div[@class="xrnccd"]'):
+
+        # The first <a> tag in the <article> contains the link to the
+        # article The href attribute of the <a> is a google internal link,
+        # we can't use.  The real link is hidden in the jslog attribute:
+        #
+        #   <a ...
+        #      jslog="95014; 4:https://www.cnn.com/.../index.html; track:click"
+        #      href="./articles/CAIiENu3nGS...?hl=en-US&amp;gl=US&amp;ceid=US%3Aen"
+        #      ... />
+
+        jslog = eval_xpath_getindex(result, './article/a/@jslog', 0)
+        url = re.findall('http[^;]*', jslog)
+        if url:
+            url = url[0]
+        else:
+            # The real URL is base64 encoded in the json attribute:
+            # jslog="95014; 5:W251bGwsbnVsbCxudW...giXQ==; track:click"
+            jslog = jslog.split(";")[1].split(':')[1].strip()
+            try:
+                padding = (4 -(len(jslog) % 4)) * "="
+                jslog = b64decode(jslog + padding)
+            except binascii.Error:
+                # URL cant be read, skip this result
+                continue
+
+            # now we have : b'[null, ... null,"https://www.cnn.com/.../index.html"]'
+            url = re.findall('http[^;"]*', str(jslog))[0]
+
+        # the first <h3> tag in the <article> contains the title of the link
+        title = extract_text(eval_xpath(result, './article/h3[1]'))
+
+        # the first <div> tag in the <article> contains the content of the link
+        content = extract_text(eval_xpath(result, './article/div[1]'))
+
+        # the second <div> tag contains origin publisher and the publishing date
+
+        pub_date = extract_text(eval_xpath(result, './article/div[2]//time'))
+        pub_origin = extract_text(eval_xpath(result, './article/div[2]//a'))
+
+        pub_info = []
+        if pub_origin:
+            pub_info.append(pub_origin)
+        if pub_date:
+            # The pub_date is mostly a string like 'yesertday', not a real
+            # timezone date or time.  Therefore we can't use publishedDate.
+            pub_info.append(pub_date)
+        pub_info = ', '.join(pub_info)
+        if pub_info:
+            content = pub_info + ': ' + content
+
+        # The image URL is located in a preceding sibling <img> tag, e.g.:
+        # "https://lh3.googleusercontent.com/DjhQh7DMszk.....z=-p-h100-w100"
+        # These URL are long but not personalized (double checked via tor).
+
+        img_src = extract_text(result.xpath('preceding-sibling::a/figure/img/@src'))
+
+        results.append({
+            'url':      url,
+            'title':    title,
+            'content':  content,
+            'img_src':  img_src,
+        })
 
     # return results
     return results