[enh] add digg engine back to SearXNG

digg was removed in 4c82ac767 since the API was no longer available, this adds
digg back by parsing HTML.

This implementation was copied from e-foundation/searx [1][2]

The CDN for https://digg.com is Cloudflare

[1] 2eb3a41155
[2] https://github.com/searx/searx/pull/3150

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

searx/engines/digg.py

@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+"""Digg (News, Social media)
+
+"""
+
+from urllib.parse import urlencode
+from datetime import datetime
+
+from lxml import html
+from searx.utils import eval_xpath, extract_text
+
+# about
+about = {
+    "website": 'https://digg.com',
+    "wikidata_id": 'Q270478',
+    "official_api_documentation": None,
+    "use_official_api": False,
+    "require_api_key": False,
+    "results": 'HTML',
+}
+
+# engine dependent config
+categories = ['news', 'social media']
+paging = True
+base_url = 'https://digg.com'
+results_per_page = 10
+
+# search-url
+search_url = base_url + ('/search' '?{query}' '&size={size}' '&offset={offset}')
+
+
+def request(query, params):
+    offset = (params['pageno'] - 1) * results_per_page + 1
+    params['url'] = search_url.format(
+        query=urlencode({'q': query}),
+        size=results_per_page,
+        offset=offset,
+    )
+    return params
+
+
+def response(resp):
+    results = []
+
+    dom = html.fromstring(resp.text)
+
+    results_list = eval_xpath(dom, '//section[contains(@class, "search-results")]')
+
+    for result in results_list:
+
+        titles = eval_xpath(result, '//article//header//h2')
+        contents = eval_xpath(result, '//article//p')
+        urls = eval_xpath(result, '//header/a/@href')
+        published_dates = eval_xpath(result, '//article/div/div/time/@datetime')
+
+        for (title, content, url, published_date) in zip(titles, contents, urls, published_dates):
+            results.append(
+                {
+                    'url': url,
+                    'publishedDate': datetime.strptime(published_date, '%Y-%m-%dT%H:%M:%SZ'),
+                    'title': extract_text(title),
+                    'content': extract_text(content),
+                }
+            )
+
+    return results

searx/settings.yml

@@ -426,6 +426,10 @@ engines:
   #   timeout: 6.0
   #   disabled: true
 
+  - name: digg
+    engine: digg
+    shortcut: dg
+
   - name: docker hub
     engine: docker_hub
     shortcut: dh