[feat] engine: implementation of alpine linux packages

Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>

docs/dev/engines/online/alpinelinux.rst

@@ -0,0 +1,13 @@
+.. _alpinelinux engine:
+
+=====================
+Alpine Linux Packages
+=====================
+
+.. contents::
+   :depth: 2
+   :local:
+   :backlinks: entry
+
+.. automodule:: searx.engines.alpinelinux
+   :members:

searx/engines/alpinelinux.py

@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""`Alpine Linux binary packages`_.  `Alpine Linux`_ is a Linux-based operation
+system designed to be small, simple and secure.  Contrary to many other Linux
+distributions, it uses musl, BusyBox and OpenRC.  Alpine is mostly used on
+servers and for Docker images.
+
+.. _Alpine Linux binary packages: https://pkgs.alpinelinux.org
+.. _Alpine Linux: https://www.alpinelinux.org
+
+"""
+
+import re
+
+from urllib.parse import urlencode
+from lxml import html
+from dateutil import parser
+
+from searx.utils import eval_xpath, eval_xpath_list, extract_text
+
+about = {
+    'website': 'https://www.alpinelinux.org',
+    'wikidata_id': 'Q4033826',
+    'use_official_api': False,
+    'official_api_documentation': None,
+    'require_api_key': False,
+    'results': 'HTML',
+}
+paging = True
+categories = ['packages', 'it']
+
+base_url = "https://pkgs.alpinelinux.org"
+alpine_arch = 'x86_64'
+"""Kernel architecture: ``x86_64``, ``x86``, ``aarch64``, ``armhf``,
+``ppc64le``, ``s390x``, ``armv7`` or ``riscv64``"""
+
+ARCH_RE = re.compile("x86_64|x86|aarch64|armhf|ppc64le|s390x|armv7|riscv64")
+"""Regular expression to match supported architectures in the query string."""
+
+
+def request(query, params):
+    query_arch = ARCH_RE.search(query)
+    if query_arch:
+        query_arch = query_arch.group(0)
+        query = query.replace(query_arch, '').strip()
+
+    args = {
+        # use wildcards to match more than just packages with the exact same
+        # name as the query
+        'name': f"*{query}*",
+        'page': params['pageno'],
+        'arch': query_arch or alpine_arch,
+    }
+    params['url'] = f"{base_url}/packages?{urlencode(args)}"
+    return params
+
+
+def response(resp):
+    results = []
+
+    doc = html.fromstring(resp.text)
+    for result in eval_xpath_list(doc, "//table/tbody/tr"):
+
+        if len(result.xpath("./td")) < 9:
+            # skip non valid entries in the result table
+            # e.g the "No item found..." message
+            continue
+
+        results.append(
+            {
+                'template': 'packages.html',
+                'url': base_url + extract_text(eval_xpath(result, './td[contains(@class, "package")]/a/@href')),
+                'title': extract_text(eval_xpath(result, './td[contains(@class, "package")]')),
+                'package_name': extract_text(eval_xpath(result, './td[contains(@class, "package")]')),
+                'publishedDate': parser.parse(extract_text(eval_xpath(result, './td[contains(@class, "bdate")]'))),
+                'version': extract_text(eval_xpath(result, './td[contains(@class, "version")]')),
+                'homepage': extract_text(eval_xpath(result, './td[contains(@class, "url")]/a/@href')),
+                'maintainer': extract_text(eval_xpath(result, './td[contains(@class, "maintainer")]')),
+                'license_name': extract_text(eval_xpath(result, './td[contains(@class, "license")]')),
+                'tags': [extract_text(eval_xpath(result, './td[contains(@class, "repo")]'))],
+            }
+        )
+
+    return results

searx/settings.yml

@@ -325,6 +325,11 @@ engines:
     shortcut: 9g
     disabled: true
 
+  - name: alpine linux packages
+    engine: alpinelinux
+    disabled: true
+    shortcut: alp
+
   - name: annas archive
     engine: annas_archive
     disabled: true