forked from zaclys/searxng
235 lines
7.7 KiB
Python
235 lines
7.7 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pylint: disable=missing-module-docstring, missing-class-docstring
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import sys
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from hashlib import sha256
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from importlib import import_module
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from os import listdir, makedirs, remove, stat, utime
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from os.path import abspath, basename, dirname, exists, join
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from shutil import copyfile
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from pkgutil import iter_modules
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from logging import getLogger
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from typing import List, Tuple
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from searx import logger, settings
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class Plugin: # pylint: disable=too-few-public-methods
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"""This class is currently never initialized and only used for type hinting."""
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id: str
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name: str
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description: str
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default_on: bool
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js_dependencies: Tuple[str]
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css_dependencies: Tuple[str]
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preference_section: str
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logger = logger.getChild("plugins")
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required_attrs = (
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# fmt: off
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("name", str),
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("description", str),
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("default_on", bool)
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# fmt: on
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)
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optional_attrs = (
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# fmt: off
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("js_dependencies", tuple),
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("css_dependencies", tuple),
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("preference_section", str),
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# fmt: on
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)
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def sha_sum(filename):
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with open(filename, "rb") as f:
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file_content_bytes = f.read()
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return sha256(file_content_bytes).hexdigest()
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def sync_resource(base_path, resource_path, name, target_dir, plugin_dir):
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dep_path = join(base_path, resource_path)
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file_name = basename(dep_path)
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resource_path = join(target_dir, file_name)
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if not exists(resource_path) or sha_sum(dep_path) != sha_sum(resource_path):
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try:
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copyfile(dep_path, resource_path)
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# copy atime_ns and mtime_ns, so the weak ETags (generated by
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# the HTTP server) do not change
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dep_stat = stat(dep_path)
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utime(resource_path, ns=(dep_stat.st_atime_ns, dep_stat.st_mtime_ns))
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except IOError:
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logger.critical("failed to copy plugin resource {0} for plugin {1}".format(file_name, name))
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sys.exit(3)
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# returning with the web path of the resource
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return join("plugins/external_plugins", plugin_dir, file_name)
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def prepare_package_resources(plugin, plugin_module_name):
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plugin_base_path = dirname(abspath(plugin.__file__))
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plugin_dir = plugin_module_name
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target_dir = join(settings["ui"]["static_path"], "plugins/external_plugins", plugin_dir)
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try:
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makedirs(target_dir, exist_ok=True)
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except IOError:
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logger.critical("failed to create resource directory {0} for plugin {1}".format(target_dir, plugin_module_name))
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sys.exit(3)
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resources = []
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if hasattr(plugin, "js_dependencies"):
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resources.extend(map(basename, plugin.js_dependencies))
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plugin.js_dependencies = [
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sync_resource(plugin_base_path, x, plugin_module_name, target_dir, plugin_dir)
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for x in plugin.js_dependencies
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]
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if hasattr(plugin, "css_dependencies"):
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resources.extend(map(basename, plugin.css_dependencies))
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plugin.css_dependencies = [
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sync_resource(plugin_base_path, x, plugin_module_name, target_dir, plugin_dir)
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for x in plugin.css_dependencies
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]
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for f in listdir(target_dir):
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if basename(f) not in resources:
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resource_path = join(target_dir, basename(f))
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try:
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remove(resource_path)
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except IOError:
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logger.critical(
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"failed to remove unused resource file {0} for plugin {1}".format(resource_path, plugin_module_name)
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)
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sys.exit(3)
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def load_plugin(plugin_module_name, external):
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# pylint: disable=too-many-branches
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try:
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plugin = import_module(plugin_module_name)
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except (
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SyntaxError,
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KeyboardInterrupt,
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SystemExit,
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SystemError,
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ImportError,
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RuntimeError,
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) as e:
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logger.critical("%s: fatal exception", plugin_module_name, exc_info=e)
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sys.exit(3)
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except BaseException:
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logger.exception("%s: exception while loading, the plugin is disabled", plugin_module_name)
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return None
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# difference with searx: use module name instead of the user name
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plugin.id = plugin_module_name
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#
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plugin.logger = getLogger(plugin_module_name)
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for plugin_attr, plugin_attr_type in required_attrs:
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if not hasattr(plugin, plugin_attr):
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logger.critical('%s: missing attribute "%s", cannot load plugin', plugin, plugin_attr)
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sys.exit(3)
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attr = getattr(plugin, plugin_attr)
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if not isinstance(attr, plugin_attr_type):
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type_attr = str(type(attr))
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logger.critical(
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'{1}: attribute "{0}" is of type {2}, must be of type {3}, cannot load plugin'.format(
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plugin, plugin_attr, type_attr, plugin_attr_type
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)
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)
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sys.exit(3)
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for plugin_attr, plugin_attr_type in optional_attrs:
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if not hasattr(plugin, plugin_attr) or not isinstance(getattr(plugin, plugin_attr), plugin_attr_type):
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setattr(plugin, plugin_attr, plugin_attr_type())
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if not hasattr(plugin, "preference_section"):
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plugin.preference_section = "general"
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# query plugin
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if plugin.preference_section == "query":
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for plugin_attr in ("query_keywords", "query_examples"):
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if not hasattr(plugin, plugin_attr):
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logger.critical('missing attribute "{0}", cannot load plugin: {1}'.format(plugin_attr, plugin))
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sys.exit(3)
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if settings.get("enabled_plugins"):
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# searx compatibility: plugin.name in settings['enabled_plugins']
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plugin.default_on = plugin.name in settings["enabled_plugins"] or plugin.id in settings["enabled_plugins"]
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# copy resources if this is an external plugin
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if external:
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prepare_package_resources(plugin, plugin_module_name)
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logger.debug("%s: loaded", plugin_module_name)
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return plugin
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def load_and_initialize_plugin(plugin_module_name, external, init_args):
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plugin = load_plugin(plugin_module_name, external)
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if plugin and hasattr(plugin, 'init'):
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try:
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return plugin if plugin.init(*init_args) else None
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except Exception: # pylint: disable=broad-except
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plugin.logger.exception("Exception while calling init, the plugin is disabled")
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return None
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return plugin
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class PluginStore:
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def __init__(self):
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self.plugins: List[Plugin] = []
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def __iter__(self):
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for plugin in self.plugins:
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yield plugin
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def register(self, plugin):
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self.plugins.append(plugin)
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def call(self, ordered_plugin_list, plugin_type, *args, **kwargs):
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ret = True
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for plugin in ordered_plugin_list:
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if hasattr(plugin, plugin_type):
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try:
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ret = getattr(plugin, plugin_type)(*args, **kwargs)
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if not ret:
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break
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except Exception: # pylint: disable=broad-except
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plugin.logger.exception("Exception while calling %s", plugin_type)
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return ret
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plugins = PluginStore()
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def plugin_module_names():
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yield_plugins = set()
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# embedded plugins
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for module in iter_modules(path=[dirname(__file__)]):
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yield (__name__ + "." + module.name, False)
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yield_plugins.add(module.name)
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# external plugins
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for module_name in settings['plugins']:
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if module_name not in yield_plugins:
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yield (module_name, True)
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yield_plugins.add(module_name)
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def initialize(app):
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for module_name, external in plugin_module_names():
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plugin = load_and_initialize_plugin(module_name, external, (app, settings))
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if plugin:
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plugins.register(plugin)
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