Repository: searxng/searxng

Issue:
Add presearch engine
<!-- PLEASE FILL THESE FIELDS, IT REALLY HELPS THE MAINTAINERS OF SearXNG -->

**Working URL to the engine**
https://presearch.com/search?q=searxng

**Why do you want to add this engine?**
presearch is a distributed search engine.

**Features of this engine**
It is a general search engine, but it displays superior results that are different from those of Google and other major engines.


**Applicable category of this engine**
`general`

**Additional context**
<!-- Add any other context about this engine here. -->



Discussion:
I would agree, please add presearch

Resolving patch:
diff --git a/searx/engines/presearch.py b/searx/engines/presearch.py
new file mode 100644
--- /dev/null
+++ b/searx/engines/presearch.py
@@ -0,0 +1,180 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+"""Presearch (general, images, videos, news)
+
+.. hint::
+
+   The results in the video category are most often links to pages that contain
+   a video, for instance many links from preasearch's video category link
+   content from facebook (aka Meta) or Twitter (aka X).  Since these are not
+   real links to video streams SearXNG can't use the video template for this and
+   if SearXNG can't use this template, then the user doesn't want to see these
+   hits in the videos category.
+
+   TL;DR; by default presearch's video category is placed into categories::
+
+       categories: [general, web]
+
+"""
+
+from urllib.parse import urlencode
+from searx.network import get
+from searx.utils import gen_useragent, html_to_text
+
+about = {
+    "website": "https://presearch.io",
+    "wikidiata_id": "Q7240905",
+    "official_api_documentation": "https://docs.presearch.io/nodes/api",
+    "use_official_api": False,
+    "require_api_key": False,
+    "results": "JSON",
+}
+paging = True
+time_range_support = True
+categories = ["general", "web"]  # general, images, videos, news
+
+search_type = "search"
+"""must be any of ``search``, ``images``, ``videos``, ``news``"""
+
+base_url = "https://presearch.com"
+safesearch_map = {0: 'false', 1: 'true', 2: 'true'}
+
+
+def init(_):
+    if search_type not in ['search', 'images', 'videos', 'news']:
+        raise ValueError(f'presearch search_type: {search_type}')
+
+
+def _get_request_id(query, page, time_range, safesearch):
+    args = {
+        "q": query,
+        "page": page,
+    }
+    if time_range:
+        args["time_range"] = time_range
+
+    url = f"{base_url}/{search_type}?{urlencode(args)}"
+    headers = {
+        'User-Agent': gen_useragent(),
+        'Cookie': f"b=1;presearch_session=;use_safe_search={safesearch_map[safesearch]}",
+    }
+    resp_text = get(url, headers=headers).text  # type: ignore
+
+    for line in resp_text.split("\n"):
+        if "window.searchId = " in line:
+            return line.split("= ")[1][:-1].replace('"', "")
+
+    return None
+
+
+def request(query, params):
+    request_id = _get_request_id(query, params["pageno"], params["time_range"], params["safesearch"])
+
+    params["headers"]["Accept"] = "application/json"
+    params["url"] = f"{base_url}/results?id={request_id}"
+
+    return params
+
+
+def _strip_leading_strings(text):
+    for x in ['wikipedia', 'google']:
+        if text.lower().endswith(x):
+            text = text[: -len(x)]
+    return text.strip()
+
+
+def parse_search_query(json_results):
+    results = []
+
+    for item in json_results.get('specialSections', {}).get('topStoriesCompact', {}).get('data', []):
+        result = {
+            'url': item['link'],
+            'title': item['title'],
+            'img_src': item['image'],
+            'content': '',
+            'metadata': item.get('source'),
+        }
+        results.append(result)
+
+    for item in json_results.get('standardResults', []):
+        result = {
+            'url': item['link'],
+            'title': item['title'],
+            'content': html_to_text(item['description']),
+        }
+        results.append(result)
+
+    info = json_results.get('infoSection', {}).get('data')
+    if info:
+        attributes = []
+        for item in info.get('about', []):
+            label, value = html_to_text(item).split(':', 1)
+            value = _strip_leading_strings(value)
+            attributes.append({'label': label, 'value': value})
+        content = []
+        for item in [info['subtitle'], info['description']]:
+            item = _strip_leading_strings(html_to_text(item))
+            if item:
+                content.append(item)
+
+        results.append(
+            {
+                'infobox': info['title'],
+                'id': info['title'],
+                'img_src': info.get('image'),
+                'content': ' | '.join(content),
+                'attributes': attributes,
+            }
+        )
+    return results
+
+
+def response(resp):
+    results = []
+    json_resp = resp.json()
+
+    if search_type == 'search':
+        results = parse_search_query(json_resp['results'])
+
+    elif search_type == 'images':
+        for item in json_resp['images']:
+            results.append(
+                {
+                    'template': 'images.html',
+                    'title': item['title'],
+                    'url': item['link'],
+                    'img_src': item['image'],
+                    'thumbnail_src': item['thumbnail'],
+                }
+            )
+
+    elif search_type == 'videos':
+        # The results in the video category are most often links to pages that contain
+        # a video and not to a video stream --> SearXNG can't use the video template.
+
+        for item in json_resp['videos']:
+            metadata = [x for x in [item.get('description'), item.get('duration')] if x]
+            results.append(
+                {
+                    'title': item['title'],
+                    'url': item['link'],
+                    'content': '',
+                    'metadata': ' / '.join(metadata),
+                    'img_src': item.get('image'),
+                }
+            )
+
+    elif search_type == 'news':
+        for item in json_resp['news']:
+            metadata = [x for x in [item.get('source'), item.get('time')] if x]
+            results.append(
+                {
+                    'title': item['title'],
+                    'url': item['link'],
+                    'content': item['description'],
+                    'metadata': ' / '.join(metadata),
+                    'img_src': item.get('image'),
+                }
+            )
+
+    return results


Test patch: