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searxng_extra/update/update_firefox_version.py

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+#!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""Fetch firefox useragent signatures
+
+Output file: :origin:`searx/data/useragents.json` (:origin:`CI Update data ...
+<.github/workflows/data-update.yml>`).
+
+"""
+# pylint: disable=use-dict-literal
+
+import json
+import re
+from urllib.parse import urlparse, urljoin
+from packaging.version import parse
+
+import requests
+from lxml import html
+from searx.data import data_dir
+
+DATA_FILE = data_dir / 'useragents.json'
+
+URL = 'https://ftp.mozilla.org/pub/firefox/releases/'
+RELEASE_PATH = '/pub/firefox/releases/'
+
+NORMAL_REGEX = re.compile(r'^[0-9]+\.[0-9](\.[0-9])?$')
+# BETA_REGEX = re.compile(r'.*[0-9]b([0-9\-a-z]+)$')
+# ESR_REGEX = re.compile(r'^[0-9]+\.[0-9](\.[0-9])?esr$')
+
+#
+useragents = {
+    # fmt: off
+    "versions": (),
+    "os": ('Windows NT 10.0; Win64; x64',
+           'X11; Linux x86_64'),
+    "ua": "Mozilla/5.0 ({os}; rv:{version}) Gecko/20100101 Firefox/{version}",
+    # fmt: on
+}
+
+
+def fetch_firefox_versions():
+    resp = requests.get(URL, timeout=2.0)
+    if resp.status_code != 200:
+        # pylint: disable=broad-exception-raised
+        raise Exception("Error fetching firefox versions, HTTP code " + resp.status_code)  # type: ignore
+    dom = html.fromstring(resp.text)
+    versions = []
+
+    for link in dom.xpath('//a/@href'):
+        url = urlparse(urljoin(URL, link))
+        path = url.path
+        if path.startswith(RELEASE_PATH):
+            version = path[len(RELEASE_PATH) : -1]
+            if NORMAL_REGEX.match(version):
+                versions.append(parse(version))
+
+    list.sort(versions, reverse=True)
+    return versions
+
+
+def fetch_firefox_last_versions():
+    versions = fetch_firefox_versions()
+
+    result = []
+    major_last = versions[0].major
+    major_list = (major_last, major_last - 1)
+    for version in versions:
+        major_current = version.major
+        minor_current = version.minor
+        if major_current in major_list:
+            user_agent_version = f'{major_current}.{minor_current}'
+            if user_agent_version not in result:
+                result.append(user_agent_version)
+
+    return result
+
+
+if __name__ == '__main__':
+    useragents["versions"] = fetch_firefox_last_versions()
+    with DATA_FILE.open('w', encoding='utf-8') as f:
+        json.dump(useragents, f, indent=4, sort_keys=True, ensure_ascii=False)