hostnames.py

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# SPDX-License-Identifier: AGPL-3.0-or-later
# pylint: disable=too-many-branches
"""
.. attention::
 
    The **"Hostname replace"** plugin has been replace by **"Hostnames
    plugin"**, see :pull:`3463` & :pull:`3552`.
 
The **Hostnames plugin** can be enabled by adding it to the
``enabled_plugins`` **list** in the ``setting.yml`` like so.
 
  .. code:: yaml
 
     enabled_plugins:
       - 'Hostnames plugin'
       ...
 
- ``hostnames.replace``: A **mapping** of regular expressions to hostnames to be
  replaced by other hostnames.
 
  .. code:: yaml
 
     hostnames:
       replace:
         '(.*\\.)?youtube\\.com$': 'invidious.example.com'
         '(.*\\.)?youtu\\.be$': 'invidious.example.com'
         ...
 
- ``hostnames.remove``: A **list** of regular expressions of the hostnames whose
  results should be taken from the results list.
 
  .. code:: yaml
 
     hostnames:
       remove:
         - '(.*\\.)?facebook.com$'
         - ...
 
- ``hostnames.high_priority``: A **list** of regular expressions for hostnames
  whose result should be given higher priority. The results from these hosts are
  arranged higher in the results list.
 
  .. code:: yaml
 
     hostnames:
       high_priority:
         - '(.*\\.)?wikipedia.org$'
         - ...
 
- ``hostnames.lower_priority``: A **list** of regular expressions for hostnames
  whose result should be given lower priority. The results from these hosts are
  arranged lower in the results list.
 
  .. code:: yaml
 
     hostnames:
       low_priority:
         - '(.*\\.)?google(\\..*)?$'
         - ...
 
If the URL matches the pattern of ``high_priority`` AND ``low_priority``, the
higher priority wins over the lower priority.
 
Alternatively, you can also specify a file name for the **mappings** or
**lists** to load these from an external file:
 
.. code:: yaml
 
   hostnames:
     replace: 'rewrite-hosts.yml'
     remove:
       - '(.*\\.)?facebook.com$'
       - ...
     low_priority:
       - '(.*\\.)?google(\\..*)?$'
       - ...
     high_priority:
       - '(.*\\.)?wikipedia.org$'
       - ...
 
The ``rewrite-hosts.yml`` from the example above must be in the folder in which
the ``settings.yml`` file is already located (``/etc/searxng``). The file then
only contains the lists or the mapping tables without further information on the
namespaces.  In the example above, this would be a mapping table that looks
something like this:
 
.. code:: yaml
 
   '(.*\\.)?youtube\\.com$': 'invidious.example.com'
   '(.*\\.)?youtu\\.be$': 'invidious.example.com'
 
"""
 
import re
from urllib.parse import urlunparse, urlparse
 
from flask_babel import gettext
 
from searx import settings
from searx.plugins import logger
from searx.settings_loader import get_yaml_cfg
 
name = gettext('Hostnames plugin')
description = gettext('Rewrite hostnames, remove results or prioritize them based on the hostname')
default_on = False
preference_section = 'general'
 
plugin_id = 'hostnames'
 
logger = logger.getChild(plugin_id)
parsed = 'parsed_url'
_url_fields = ['iframe_src', 'audio_src']
 
 
def _load_regular_expressions(settings_key):
    setting_value = settings.get(plugin_id, {}).get(settings_key)
 
    if not setting_value:
        return {}
 
    # load external file with configuration
    if isinstance(setting_value, str):
        setting_value = get_yaml_cfg(setting_value)
 
    if isinstance(setting_value, list):
        return {re.compile(r) for r in setting_value}
 
    if isinstance(setting_value, dict):
        return {re.compile(p): r for (p, r) in setting_value.items()}
 
    return {}
 
 
replacements = _load_regular_expressions('replace')
removables = _load_regular_expressions('remove')
high_priority = _load_regular_expressions('high_priority')
low_priority = _load_regular_expressions('low_priority')
 
 
def _matches_parsed_url(result, pattern):
    return parsed in result and pattern.search(result[parsed].netloc)
 
 
def on_result(_request, _search, result):
    for pattern, replacement in replacements.items():
        if _matches_parsed_url(result, pattern):
            # logger.debug(result['url'])
            result[parsed] = result[parsed]._replace(netloc=pattern.sub(replacement, result[parsed].netloc))
            result['url'] = urlunparse(result[parsed])
            # logger.debug(result['url'])
 
        for url_field in _url_fields:
            if not result.get(url_field):
                continue
 
            url_src = urlparse(result[url_field])
            if pattern.search(url_src.netloc):
                url_src = url_src._replace(netloc=pattern.sub(replacement, url_src.netloc))
                result[url_field] = urlunparse(url_src)
 
    for pattern in removables:
        if _matches_parsed_url(result, pattern):
            return False
 
        for url_field in _url_fields:
            if not result.get(url_field):
                continue
 
            url_src = urlparse(result[url_field])
            if pattern.search(url_src.netloc):
                del result[url_field]
 
    for pattern in low_priority:
        if _matches_parsed_url(result, pattern):
            result['priority'] = 'low'
 
    for pattern in high_priority:
        if _matches_parsed_url(result, pattern):
            result['priority'] = 'high'
 
    return True