'''
searx is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
searx is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with searx. If not, see < http://www.gnu.org/licenses/ >.
(C) 2015 by Adam Tauber, <asciimoo@gmail.com>
'''
from hashlib import sha256
from importlib import import_module
from os import listdir, makedirs, remove, stat, utime
from os.path import abspath, basename, dirname, exists, join
from shutil import copyfile
from searx import logger, settings
logger = logger.getChild('plugins')
from searx.plugins import (oa_doi_rewrite,
ahmia_filter,
hash_plugin,
infinite_scroll,
self_info,
search_on_category_select,
tracker_url_remover,
vim_hotkeys)
required_attrs = (('name', str),
('description', str),
('default_on', bool))
optional_attrs = (('js_dependencies', tuple),
('css_dependencies', tuple),
('preference_section', str))
class Plugin():
default_on = False
name = 'Default plugin'
description = 'Default plugin description'
class PluginStore():
def __init__(self):
self.plugins = []
def __iter__(self):
for plugin in self.plugins:
yield plugin
def register(self, *plugins, external=False):
if external:
plugins = load_external_plugins(plugins)
for plugin in plugins:
for plugin_attr, plugin_attr_type in required_attrs:
if not hasattr(plugin, plugin_attr):
logger.critical('missing attribute "{0}", cannot load plugin: {1}'.format(plugin_attr, plugin))
exit(3)
attr = getattr(plugin, plugin_attr)
if not isinstance(attr, plugin_attr_type):
type_attr = str(type(attr))
logger.critical(
'attribute "{0}" is of type {2}, must be of type {3}, cannot load plugin: {1}'
.format(plugin_attr, plugin, type_attr, plugin_attr_type)
)
exit(3)
for plugin_attr, plugin_attr_type in optional_attrs:
if not hasattr(plugin, plugin_attr) or not isinstance(getattr(plugin, plugin_attr), plugin_attr_type):
setattr(plugin, plugin_attr, plugin_attr_type())
plugin.id = plugin.name.replace(' ', '_')
if not hasattr(plugin, 'preference_section'):
plugin.preference_section = 'general'
if plugin.preference_section == 'query':
for plugin_attr in ('query_keywords', 'query_examples'):
if not hasattr(plugin, plugin_attr):
logger.critical('missing attribute "{0}", cannot load plugin: {1}'.format(plugin_attr, plugin))
exit(3)
self.plugins.append(plugin)
def call(self, ordered_plugin_list, plugin_type, request, *args, **kwargs):
ret = True
for plugin in ordered_plugin_list:
if hasattr(plugin, plugin_type):
ret = getattr(plugin, plugin_type)(request, *args, **kwargs)
if not ret:
break
return ret
def load_external_plugins(plugin_names):
plugins = []
for name in plugin_names:
logger.debug('loading plugin: {0}'.format(name))
try:
pkg = import_module(name)
except Exception as e:
logger.critical('failed to load plugin module {0}: {1}'.format(name, e))
exit(3)
pkg.__base_path = dirname(abspath(pkg.__file__))
prepare_package_resources(pkg, name)
plugins.append(pkg)
logger.debug('plugin "{0}" loaded'.format(name))
return plugins
def sync_resource(base_path, resource_path, name, target_dir, plugin_dir):
dep_path = join(base_path, resource_path)
file_name = basename(dep_path)
resource_path = join(target_dir, file_name)
if not exists(resource_path) or sha_sum(dep_path) != sha_sum(resource_path):
try:
copyfile(dep_path, resource_path)
# copy atime_ns and mtime_ns, so the weak ETags (generated by
# the HTTP server) do not change
dep_stat = stat(dep_path)
utime(resource_path, ns=(dep_stat.st_atime_ns, dep_stat.st_mtime_ns))
except:
logger.critical('failed to copy plugin resource {0} for plugin {1}'.format(file_name, name))
exit(3)
# returning with the web path of the resource
return join('plugins/external_plugins', plugin_dir, file_name)
def prepare_package_resources(pkg, name):
plugin_dir = 'plugin_' + name
target_dir = join(settings['ui']['static_path'], 'plugins/external_plugins', plugin_dir)
try:
makedirs(target_dir, exist_ok=True)
except:
logger.critical('failed to create resource directory {0} for plugin {1}'.format(target_dir, name))
exit(3)
resources = []
if hasattr(pkg, 'js_dependencies'):
resources.extend(map(basename, pkg.js_dependencies))
pkg.js_dependencies = tuple([
sync_resource(pkg.__base_path, x, name, target_dir, plugin_dir)
for x in pkg.js_dependencies
])
if hasattr(pkg, 'css_dependencies'):
resources.extend(map(basename, pkg.css_dependencies))
pkg.css_dependencies = tuple([
sync_resource(pkg.__base_path, x, name, target_dir, plugin_dir)
for x in pkg.css_dependencies
])
for f in listdir(target_dir):
if basename(f) not in resources:
resource_path = join(target_dir, basename(f))
try:
remove(resource_path)
except:
logger.critical('failed to remove unused resource file {0} for plugin {1}'.format(resource_path, name))
exit(3)
def sha_sum(filename):
with open(filename, "rb") as f:
file_content_bytes = f.read()
return sha256(file_content_bytes).hexdigest()
plugins = PluginStore()
plugins.register(oa_doi_rewrite)
plugins.register(hash_plugin)
plugins.register(infinite_scroll)
plugins.register(self_info)
plugins.register(search_on_category_select)
plugins.register(tracker_url_remover)
plugins.register(vim_hotkeys)
# load external plugins
if settings['plugins']:
plugins.register(*settings['plugins'], external=True)
if settings['enabled_plugins']:
for plugin in plugins:
if plugin.name in settings['enabled_plugins']:
plugin.default_on = True
else:
plugin.default_on = False
# load tor specific plugins
if settings['outgoing']['using_tor_proxy']:
plugins.register(ahmia_filter)