[mod] implement brave (WEB) engine to replace XPath configuration

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

docs/dev/engines/online/brave.rst

@@ -0,0 +1,13 @@
+.. _brave engine:
+
+=============
+Brave Engines
+=============
+
+.. contents:: Contents
+   :depth: 2
+   :local:
+   :backlinks: entry
+
+.. automodule:: searx.engines.brave
+  :members:

searx/engines/brave.py

@@ -1,10 +1,56 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+"""Brave supports the categories listed in :py:obj:`brave_category` (General,
+news, videos, images).  The support of :py:obj:`paging` and :py:obj:`time range
+<time_range_support>` is limited (see remarks).
+
+Configured ``brave`` engines:
+
+.. code:: yaml
+
+  - name: brave
+    engine: brave
+    ...
+    brave_category: search
+    time_range_support: true
+    paging: true
+
+  - name: brave.images
+    engine: brave
+    ...
+    brave_category: images
+
+  - name: brave.videos
+    engine: brave
+    ...
+    brave_category: videos
+
+  - name: brave.news
+    engine: brave
+    ...
+    brave_category: news
+
+
+Implementations
+===============
+
 """
- Brave (General, news, videos, images)
-"""
+# pylint: disable=fixme
+
+from urllib.parse import (
+    urlencode,
+    urlparse,
+    parse_qs,
+)
 
-from urllib.parse import urlencode
 import chompjs
+from lxml import html
+
+from searx.utils import (
+    extract_text,
+    eval_xpath_list,
+    eval_xpath_getindex,
+)
 
 about = {
     "website": 'https://search.brave.com/',
@@ -14,41 +60,87 @@ about = {
     "require_api_key": False,
     "results": 'HTML',
 }
+
 base_url = "https://search.brave.com/"
+categories = []
+brave_category = 'search'
+"""Brave supports common web-search, video search, image and video search.
+
+- ``search``: Common WEB search
+- ``videos``: search for videos
+- ``images``: search for images
+- ``news``: search for news
+"""
+
+brave_spellcheck = False
+"""Brave supports some kind of spell checking.  When activated, Brave tries to
+fix typos, e.g. it searches for ``food`` when the user queries for ``fooh``.  In
+the UI of Brave the user gets warned about this, since we can not warn the user
+in SearXNG, the spellchecking is disabled by default.
+"""
+
+send_accept_language_header = True
 paging = False
-categories = ['images', 'videos', 'news']  # images, videos, news
+"""Brave only supports paging in :py:obj:`brave_category` ``search`` (UI
+category All)."""
+
+safesearch = True
+safesearch_map = {2: 'strict', 1: 'moderate', 0: 'off'}  # cookie: safesearch=off
+
+time_range_support = False
+"""Brave only supports time-range in :py:obj:`brave_category` ``search`` (UI
+category All)."""
+
+time_range_map = {
+    'day': 'pd',
+    'week': 'pw',
+    'month': 'pm',
+    'year': 'py',
+}
 
 
 def request(query, params):
+
+    # Don't accept br encoding / see https://github.com/searxng/searxng/pull/1787
+    params['headers']['Accept-Encoding'] = 'gzip, deflate'
+
     args = {
         'q': query,
-        'spellcheck': 1,
     }
-    params["url"] = f"{base_url}{categories[0]}?{urlencode(args)}"
-
-
-def get_video_results(json_data):
-    results = []
-
-    for result in json_data:
-        results.append(
-            {
-                'template': 'videos.html',
-                'url': result['url'],
-                'thumbnail_src': result['thumbnail']['src'],
-                'img_src': result['properties']['url'],
-                'content': result['description'],
-                'title': result['title'],
-                'source': result['source'],
-                'duration': result['video']['duration'],
-            }
-        )
+    if brave_spellcheck:
+        args['spellcheck'] = '1'
+
+    if brave_category == 'search':
+        if params.get('pageno', 1) - 1:
+            args['offset'] = params.get('pageno', 1) - 1
+        if time_range_map.get(params['time_range']):
+            args['tf'] = time_range_map.get(params['time_range'])
+
+    params["url"] = f"{base_url}{brave_category}?{urlencode(args)}"
+
+    # set preferences in cookie
+    params['cookies']['safesearch'] = safesearch_map.get(params['safesearch'], 'off')
+
+    # ToDo: we need a fetch_traits(..) implementation / the ui_lang of Brave are
+    #       limited and the country handling has it quirks
+
+    eng_locale = params.get('searxng_locale')
+    params['cookies']['useLocation'] = '0'  # the useLocation is IP based, we use 'country'
+    params['cookies']['summarizer'] = '0'
 
-    return results
+    if not eng_locale or eng_locale == 'all':
+        params['cookies']['country'] = 'all'  # country=all
+    else:
+        params['cookies']['country'] = eng_locale.split('-')[-1].lower()
+        params['cookies']['ui_lang'] = eng_locale.split('-')[0].lower()
+
+    # logger.debug("cookies %s", params['cookies'])
 
 
 def response(resp):
-    results = []
+
+    if brave_category == 'search':
+        return _parse_search(resp)
 
     datastr = ""
     for line in resp.text.split("\n"):
@@ -57,10 +149,81 @@ def response(resp):
             break
 
     json_data = chompjs.parse_js_object(datastr)
-
     json_resp = json_data[1]['data']['body']['response']
-    if categories[0] == 'news':
+
+    if brave_category == 'news':
         json_resp = json_resp['news']
+        return _parse_news(json_resp)
+
+    if brave_category == 'images':
+        return _parse_images(json_resp)
+    if brave_category == 'videos':
+        return _parse_videos(json_resp)
+
+    return []
+
+
+def _parse_search(resp):
+
+    result_list = []
+    dom = html.fromstring(resp.text)
+
+    answer_tag = eval_xpath_getindex(dom, '//div[@class="answer"]', 0, default=None)
+    if answer_tag:
+        result_list.append({'answer': extract_text(answer_tag)})
+
+    # xpath_results = '//div[contains(@class, "snippet fdb") and @data-type="web"]'
+    xpath_results = '//div[contains(@class, "snippet")]'
+
+    for result in eval_xpath_list(dom, xpath_results):
+
+        url = eval_xpath_getindex(result, './/a[@class="result-header"]/@href', 0, default=None)
+        title_tag = eval_xpath_getindex(result, './/span[@class="snippet-title"]', 0, default=None)
+        if not (url and title_tag):
+            continue
+
+        content_tag = eval_xpath_getindex(result, './/p[@class="snippet-description"]', 0, default='')
+        img_src = eval_xpath_getindex(result, './/img[@class="thumb"]/@src', 0, default='')
+
+        item = {
+            'url': url,
+            'title': extract_text(title_tag),
+            'content': extract_text(content_tag),
+            'img_src': img_src,
+        }
+
+        video_tag = eval_xpath_getindex(
+            result, './/div[contains(@class, "video-snippet") and @data-macro="video"]', 0, default=None
+        )
+        if video_tag:
+
+            # In my tests a video tag in the WEB search was mostoften not a
+            # video, except the ones from youtube ..
+
+            iframe_src = _get_iframe_src(url)
+            if iframe_src:
+                item['iframe_src'] = iframe_src
+                item['template'] = 'videos.html'
+                item['thumbnail'] = eval_xpath_getindex(video_tag, './/img/@src', 0, default='')
+            else:
+                item['img_src'] = eval_xpath_getindex(video_tag, './/img/@src', 0, default='')
+
+        result_list.append(item)
+
+    return result_list
+
+
+def _get_iframe_src(url):
+    parsed_url = urlparse(url)
+    if parsed_url.path == '/watch' and parsed_url.query:
+        video_id = parse_qs(parsed_url.query).get('v', [])  # type: ignore
+        if video_id:
+            return 'https://www.youtube-nocookie.com/embed/' + video_id[0]  # type: ignore
+    return None
+
+
+def _parse_news(json_resp):
+    result_list = []
 
     for result in json_resp["results"]:
         item = {
@@ -68,18 +231,53 @@ def response(resp):
             'title': result['title'],
             'content': result['description'],
         }
+        if result['thumbnail'] != "null":
+            item['img_src'] = result['thumbnail']['src']
+        result_list.append(item)
+
+    return result_list
+
+
+def _parse_images(json_resp):
+    result_list = []
+
+    for result in json_resp["results"]:
+        item = {
+            'url': result['url'],
+            'title': result['title'],
+            'content': result['description'],
+            'template': 'images.html',
+            'img_format': result['properties']['format'],
+            'source': result['source'],
+            'img_src': result['properties']['url'],
+        }
+        result_list.append(item)
+
+    return result_list
+
+
+def _parse_videos(json_resp):
+    result_list = []
+
+    for result in json_resp["results"]:
+
+        url = result['url']
+        item = {
+            'url': url,
+            'title': result['title'],
+            'content': result['description'],
+            'template': 'videos.html',
+            'length': result['video']['duration'],
+            'duration': result['video']['duration'],
+        }
+
         if result['thumbnail'] != "null":
             item['thumbnail'] = result['thumbnail']['src']
 
-        if categories[0] == 'images':
-            item['template'] = 'images.html'
-            item['img_format'] = result['properties']['format']
-            item['source'] = result['source']
-            item['img_src'] = result['properties']['url']
-        elif categories[0] == 'videos':
-            item['template'] = 'videos.html'
-            item['length'] = result['video']['duration']
+        iframe_src = _get_iframe_src(url)
+        if iframe_src:
+            item['iframe_src'] = iframe_src
 
-        results.append(item)
+        result_list.append(item)
 
-    return results
+    return result_list

searx/settings.yml

@@ -1816,50 +1816,34 @@ engines:
     timeout: 9.0
 
   - name: brave
-    shortcut: brave
-    engine: xpath
-    paging: true
+    engine: brave
+    shortcut: br
     time_range_support: true
-    first_page_num: 0
-    time_range_url: "&tf={time_range_val}"
-    search_url: https://search.brave.com/search?q={query}&offset={pageno}&spellcheck=1{time_range}
-    url_xpath: //a[@class="result-header"]/@href
-    title_xpath: //span[@class="snippet-title"]
-    content_xpath: //p[1][@class="snippet-description"]
-    suggestion_xpath: //div[@class="text-gray h6"]/a
-    time_range_map:
-      day: 'pd'
-      week: 'pw'
-      month: 'pm'
-      year: 'py'
+    paging: true
     categories: [general, web]
-    disabled: true
-    headers:
-      Accept-Encoding: gzip, deflate
-    about:
-      website: https://brave.com/search/
-      wikidata_id: Q107355971
-      use_official_api: false
-      require_api_key: false
-      results: HTML
+    brave_category: search
+    # brave_spellcheck: true
 
   - name: brave.images
-    shortcut: braveimg
     engine: brave
-    categories: images
-    disabled: true
+    network: brave
+    shortcut: brimg
+    categories: [images, web]
+    brave_category: images
 
   - name: brave.videos
-    shortcut: bravevid
     engine: brave
-    categories: videos
-    disabled: true
+    network: brave
+    shortcut: brvid
+    categories: [videos, web]
+    brave_category: videos
 
   - name: brave.news
-    shortcut: bravenews
     engine: brave
+    network: brave
+    shortcut: brnews
     categories: news
-    disabled: true
+    brave_category: news
 
   - name: petalsearch
     shortcut: pts