Pick minor fixes from searxng (#3251)

* [fix] Rename ccengine engine to openverse

The CC engine was merged with WordPress and renamed to Openverse

Source: https://wordpress.org/news/2021/05/welcome-to-openverse/

* [fix] ccengine engine - avoid unwanted redirects

api.openverse.engineering is a little picky and wants to have a trailing slash
in the path:

    /v1/images? -->/ v1/images/?

otherwise it redirects, here is the debug log:

    DEBUG   searx.network.openverse       : HTTP Request: GET https://api.openverse.engineering/v1/images?&page=1&page_size=20&format=json&q=foo "HTTP/2 301 Moved Permanently" (text/html; charset=utf-8)
    DEBUG   searx.network.openverse       : HTTP Request: GET https://api.openverse.engineering/v1/images/?&page=1&page_size=20&format=json&q=foo "HTTP/2 200 OK" (application/json)
    WARNING searx.engines.openverse       : ErrorContext('searx/search/processors/online.py', 105, 'count_error(', None, '1 redirects, maximum: 0', ('200', 'OK', 'api.openverse.engineering')) True

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

* [fix] FutureWarning from lxml

Just in case if content is None, the original code will skip extract_text(), and
just append the None value to 'content'. So just add allow_none=True, and this
will return None without raising a ValueError in extract_text().

* [enh] Add pagination to Brave

Also added ```&spellcheck=1``` because now it is disabled by default, not returning any ```suggestion_xpath```.

Co-authored-by: Léon Tiekötter <leon@tiekoetter.com>
Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>
Co-authored-by: capric98 <42015599+capric98@users.noreply.github.com>
Co-authored-by: Allen <64094914+allendema@users.noreply.github.com>

searx/engines/openverse.py

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 """
 
- Creative Commons search engine (Images)
+ Openverse (formerly known as: Creative Commons search engine) [Images]
 
 """
 
@@ -23,8 +23,8 @@ categories = ['images']
 paging = True
 nb_per_page = 20
 
-base_url = 'https://api.creativecommons.engineering/v1/images?'
-search_string = '&page={page}&page_size={nb_per_page}&format=json&{query}'
+base_url = 'https://api.openverse.engineering/v1/images/'
+search_string = '?page={page}&page_size={nb_per_page}&format=json&{query}'
 
 
 def request(query, params):

searx/engines/yahoo.py

@@ -135,8 +135,7 @@ def response(resp):
         content = eval_xpath_getindex(
             result, './/div[contains(@class, "compText")]', 0, default=''
         )
-        if content:
-            content = extract_text(content)
+        content = extract_text(content, allow_none=True)
 
         # append result
         results.append({'url': url,

searx/settings.yml

@@ -295,10 +295,10 @@ engines:
       require_api_key: false
       results: HTML
 
-  - name : ccengine
-    engine : ccengine
+  - name: openverse
+    engine: openverse
     categories: images
-    shortcut : cce
+    shortcut: opv
 
 # - name : core.ac.uk
 #   engine : core
@@ -1638,8 +1638,9 @@ engines:
   - name: brave
     shortcut: brave
     engine: xpath
-    paging: false
-    search_url: https://search.brave.com/search?q={query}
+    paging: true
+    first_page_num: 0
+    search_url: https://search.brave.com/search?q={query}&offset={pageno}&spellcheck=1
     url_xpath: //div[@class="snippet fdb"]/a/@href
     title_xpath: //span[@class="snippet-title"]
     content_xpath: //p[1][@class="snippet-description"]