[mod] improve seekr engines and add documentation

Tis patch adds some more fields to the result items and changed paging to the
``nextResultSet`` given in seekr's JSON response.

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

docs/dev/engines/online/seekr.rst

@@ -0,0 +1,13 @@
+.. _seekr engine:
+
+=============
+Seekr Engines
+=============
+
+.. contents:: Contents
+   :depth: 2
+   :local:
+   :backlinks: entry
+
+.. automodule:: searx.engines.seekr
+  :members:

searx/engines/seekr.py

@@ -1,50 +1,120 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # lint: pylint
-"""Seekr (images, videos, news)
+"""seekr.com Seeker Score
+
+Seekr is a privately held search and content evaluation engine that prioritizes
+credibility over popularity.
+
+Configuration
+=============
+
+The engine has the following additional settings:
+
+- :py:obj:`seekr_category`
+- :py:obj:`api_key`
+
+This implementation is used by seekr engines in the :ref:`settings.yml
+<settings engine>`:
+
+.. code:: yaml
+
+  - name: seekr news
+    seekr_category: news
+    ...
+  - name: seekr images
+    seekr_category: images
+    ...
+  - name: seekr videos
+    seekr_category: videos
+    ...
+
+Known Quirks
+============
+
+The implementation to support :py:obj:`paging <searx.enginelib.Engine.paging>`
+is based on the *nextpage* method of Seekr's REST API.  This feature is *next
+page driven* and plays well with the :ref:`infinite_scroll <settings ui>`
+setting in SearXNG but it does not really fit into SearXNG's UI to select a page
+by number.
+
+Implementations
+===============
+
 """
 
 from datetime import datetime
 from json import loads
 from urllib.parse import urlencode
+from flask_babel import gettext
 
 about = {
     "website": 'https://seekr.com/',
     "official_api_documentation": None,
-    "use_official_api": True,
+    "use_official_api": False,
     "require_api_key": True,
     "results": 'JSON',
+    "language": 'en',
 }
-paging = True  # news search doesn't support paging
 
 base_url = "https://api.seekr.com"
-# v2/newssearch, v1/imagetab, v1/videotab
-seekr_path = "newssearch"
-seekr_api_version = "v2"
+paging = True
+
 api_key = "srh1-22fb-sekr"
-results_per_page = 10
+"""API key / reversed engineered / is still the same one since 2022."""
+
+seekr_category: str = 'unset'
+"""Search category, any of ``news``, ``videos`` or ``images``."""
+
+
+def init(engine_settings):
+
+    # global paging
+    if engine_settings['seekr_category'] not in ['news', 'videos', 'images']:
+        raise ValueError(f"Unsupported seekr category: {engine_settings['seekr_category']}")
 
 
 def request(query, params):
+
+    if not query:
+        return None
+
     args = {
         'query': query,
         'apiKey': api_key,
-        'limit': results_per_page,
-        'offset': (params['pageno'] - 1) * results_per_page,
     }
 
-    path = f"{seekr_api_version}/{seekr_path}"
-    if seekr_api_version == "v1":
-        path = seekr_path
+    api_url = base_url + '/engine'
+    if seekr_category == 'news':
+        api_url += '/v2/newssearch'
 
-    params['url'] = f"{base_url}/engine/{path}?{urlencode(args)}"
+    elif seekr_category == 'images':
+        api_url += '/imagetab'
+
+    elif seekr_category == 'videos':
+        api_url += '/videotab'
+
+    params['url'] = f"{api_url}?{urlencode(args)}"
+    if params['pageno'] > 1:
+        nextpage = params['engine_data'].get('nextpage')
+        if nextpage:
+            params['url'] = nextpage
 
     return params
 
 
 def _images_response(json):
-    results = []
 
-    for result in json['expertResponses'][0]['advice']['results']:
+    search_results = json.get('expertResponses')
+    if search_results:
+        search_results = search_results[0].get('advice')
+    else:  # response from a 'nextResultSet'
+        search_results = json.get('advice')
+
+    results = []
+    if not search_results:
+        return results
+
+    for result in search_results['results']:
         summary = loads(result['summary'])
         results.append(
             {
@@ -53,52 +123,96 @@ def _images_response(json):
                 'title': result['title'],
                 'img_src': result['url'],
                 'img_format': f"{summary['width']}x{summary['height']}",
+                'thumbnail_src': 'https://media.seekr.com/engine/rp/' + summary['tg'] + '/?src= ' + result['thumbnail'],
             }
         )
 
+    if search_results.get('nextResultSet'):
+        results.append(
+            {
+                "engine_data": search_results.get('nextResultSet'),
+                "key": "nextpage",
+            }
+        )
     return results
 
 
 def _videos_response(json):
-    results = []
 
-    for result in json['expertResponses'][0]['advice']['results']:
+    search_results = json.get('expertResponses')
+    if search_results:
+        search_results = search_results[0].get('advice')
+    else:  # response from a 'nextResultSet'
+        search_results = json.get('advice')
+
+    results = []
+    if not search_results:
+        return results
+
+    for result in search_results['results']:
+        summary = loads(result['summary'])
         results.append(
             {
                 'template': 'videos.html',
                 'url': result['url'],
                 'title': result['title'],
+                'thumbnail': 'https://media.seekr.com/engine/rp/' + summary['tg'] + '/?src= ' + result['thumbnail'],
             }
         )
 
+    if search_results.get('nextResultSet'):
+        results.append(
+            {
+                "engine_data": search_results.get('nextResultSet'),
+                "key": "nextpage",
+            }
+        )
     return results
 
 
 def _news_response(json):
-    results = []
 
-    for result in json['expertResponses'][0]['advice']['categorySearchResult']['searchResult']['results']:
+    search_results = json.get('expertResponses')
+    if search_results:
+        search_results = search_results[0]['advice']['categorySearchResult']['searchResult']
+    else:  # response from a 'nextResultSet'
+        search_results = json.get('advice')
+
+    results = []
+    if not search_results:
+        return results
+
+    for result in search_results['results']:
+
         results.append(
             {
                 'url': result['url'],
                 'title': result['title'],
-                'content': result['summary'],
+                'content': result['summary'] or result["topCategory"] or result["displayUrl"] or '',
                 'thumbnail': result.get('thumbnail', ''),
                 'publishedDate': datetime.strptime(result['pubDate'][:19], '%Y-%m-%d %H:%M:%S'),
+                'metadata': gettext("Language") + ': ' + result.get('language', ''),
             }
         )
 
+    if search_results.get('nextResultSet'):
+        results.append(
+            {
+                "engine_data": search_results.get('nextResultSet'),
+                "key": "nextpage",
+            }
+        )
     return results
 
 
 def response(resp):
     json = resp.json()
 
-    if seekr_path == "videotab":
+    if seekr_category == "videos":
         return _videos_response(json)
-    if seekr_path == "imagetab":
+    if seekr_category == "images":
         return _images_response(json)
-    if seekr_path == "newssearch":
+    if seekr_category == "news":
         return _news_response(json)
 
-    raise ValueError(f"Unsupported seekr path: {seekr_path}")
+    raise ValueError(f"Unsupported seekr category: {seekr_category}")

searx/settings.yml

@@ -1809,27 +1809,25 @@ engines:
 
   - name: seekr news
     engine: seekr
-    paging: false
     shortcut: senews
     categories: news
-    seekr_path: newssearch
-    seekr_api_version: v2
+    seekr_category: news
     disabled: true
 
   - name: seekr images
     engine: seekr
+    network: seekr news
     shortcut: seimg
     categories: images
-    seekr_path: imagetab
-    seekr_api_version: v1
+    seekr_category: images
     disabled: true
 
   - name: seekr videos
     engine: seekr
+    network: seekr news
     shortcut: sevid
     categories: videos
-    seekr_path: videotab
-    seekr_api_version: v1
+    seekr_category: videos
     disabled: true
 
   - name: sjp.pwn