[fix] google engines: update XPaths for modern mobile UI (#5836)

Google recently changed the DOM structure for mobile-centric responses, causing the `google_videos` engine to return zero results and the main `google` engine to drop the majority of its results (due to missing snippets or failed URL parsing). These changes restore the functionality and improve the result count for both engines.

This patch updates the parsing logic for both the `google` and `google_videos` engines to handle the modern HTML structure returned by Google when using GSA (Google Search App) User-Agents.

**Specific changes include:**

* **Google Videos (`gov`)**:
    * Updated title XPath to support `role="heading"`.
    * Improved URL extraction to correctly decode Google redirectors (`/url?q=...`) using `unquote`.
    * Added support for the `WRu9Cd` class to capture publication metadata (author/date).
    * Broadened thumbnail search and added a fallback to YouTube's `hqdefault.jpg`.

* **Google Web**:
    * Relaxed the strict snippet (`content`) requirement. Valid results are no longer discarded if a snippet is missing in the mobile UI.
    * Hardened URL extraction to handle both direct and redirected URLs safely.
    * Improved thumbnail extraction by searching the entire result block.

searx/engines/google.py

@@ -379,7 +379,11 @@ def response(resp: "SXNG_Response"):
                     title,
                 )
                 continue
-            url = unquote(raw_url[7:].split("&sa=U")[0])  # remove the google redirector
+
+            if raw_url.startswith('/url?q='):
+                url = unquote(raw_url[7:].split("&sa=U")[0])  # remove the google redirector
+            else:
+                url = raw_url
 
             content_nodes = eval_xpath(result, './/div[contains(@data-sncf, "1")]')
             for item in content_nodes:
@@ -388,24 +392,17 @@ def response(resp: "SXNG_Response"):
 
             content = extract_text(content_nodes)
 
-            if not content:
-                logger.debug(
-                    'ignoring item from the result_xpath list: missing content of title "%s"',
-                    title,
-                )
-                continue
-
-            thumbnail = content_nodes[0].xpath(".//img/@src")
+            thumbnail = result.xpath(".//img/@src")
             if thumbnail:
                 thumbnail = thumbnail[0]
                 if thumbnail.startswith("data:image"):
-                    img_id = content_nodes[0].xpath(".//img/@id")
+                    img_id = result.xpath(".//img/@id")
                     if img_id:
                         thumbnail = data_image_map.get(img_id[0])
             else:
                 thumbnail = None
 
-            results.append({"url": url, "title": title, "content": content, "thumbnail": thumbnail})
+            results.append({"url": url, "title": title, "content": content or '', "thumbnail": thumbnail})
 
         except Exception as e:  # pylint: disable=broad-except
             logger.error(e, exc_info=True)

searx/engines/google_videos.py

@@ -12,7 +12,7 @@
    https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs
 """
 
-from urllib.parse import urlencode, urlparse, parse_qs
+from urllib.parse import urlencode, urlparse, parse_qs, unquote
 from lxml import html
 
 from searx.utils import (
@@ -100,14 +100,23 @@ def response(resp):
     # parse results
     for result in result_divs:
         title = extract_text(
-            eval_xpath_getindex(result, './/h3[contains(@class, "LC20lb")]', 0, default=None), allow_none=True
+            eval_xpath_getindex(result, './/h3[contains(@class, "LC20lb")] | .//div[@role="heading"]', 0, default=None),
+            allow_none=True,
         )
-        url = eval_xpath_getindex(result, './/a[@jsname="UWckNb"]/@href', 0, default=None)
+        url = eval_xpath_getindex(
+            result, './/a[@jsname="UWckNb"]/@href | .//a[contains(@href, "/url?q=")]/@href', 0, default=None
+        )
+        if url and url.startswith('/url?q='):
+            url = unquote(url[7:].split('&sa=U')[0])
+
         content = extract_text(
             eval_xpath_getindex(result, './/div[contains(@class, "ITZIwc")]', 0, default=None), allow_none=True
         )
         pub_info = extract_text(
-            eval_xpath_getindex(result, './/div[contains(@class, "gqF9jc")]', 0, default=None), allow_none=True
+            eval_xpath_getindex(
+                result, './/div[contains(@class, "gqF9jc")] | .//div[contains(@class, "WRu9Cd")]', 0, default=None
+            ),
+            allow_none=True,
         )
         # Broader XPath to find any <img> element
         thumbnail = eval_xpath_getindex(result, './/img/@src', 0, default=None)