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							'''
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							searx is free software: you can redistribute it and/or modify
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							it under the terms of the GNU Affero General Public License as published by
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							the Free Software Foundation, either version 3 of the License, or
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							(at your option) any later version.
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							searx is distributed in the hope that it will be useful,
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							but WITHOUT ANY WARRANTY; without even the implied warranty of
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							MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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							GNU Affero General Public License for more details.
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							You should have received a copy of the GNU Affero General Public License
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							along with searx. If not, see < http://www.gnu.org/licenses/ >.
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							(C) 2015 by Adam Tauber, <asciimoo@gmail.com>
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							'''
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							from sys import exit, version_info
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							from searx import logger
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							if version_info[0] == 3:
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							    unicode = str
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							logger = logger.getChild('plugins')
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							from searx.plugins import (oa_doi_rewrite,
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							                           https_rewrite,
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							                           infinite_scroll,
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							                           open_results_on_new_tab,
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							                           self_info,
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							                           search_on_category_select,
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							                           tracker_url_remover,
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							                           vim_hotkeys)
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							required_attrs = (('name', (str, unicode)),
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							                  ('description', (str, unicode)),
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							                  ('default_on', bool))
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							optional_attrs = (('js_dependencies', tuple),
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							                  ('css_dependencies', tuple))
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							class Plugin():
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							    default_on = False
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							    name = 'Default plugin'
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							    description = 'Default plugin description'
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							class PluginStore():
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							    def __init__(self):
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							        self.plugins = []
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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, *plugins):
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							        for plugin in plugins:
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							            for plugin_attr, plugin_attr_type in required_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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							                    logger.critical('missing attribute "{0}", cannot load plugin: {1}'.format(plugin_attr, plugin))
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							                    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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							            plugin.id = plugin.name.replace(' ', '_')
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							            self.plugins.append(plugin)
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							    def call(self, ordered_plugin_list, plugin_type, request, *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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							                ret = getattr(plugin, plugin_type)(request, *args, **kwargs)
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							                if not ret:
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							                    break
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							        return ret
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							plugins = PluginStore()
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							plugins.register(oa_doi_rewrite)
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							plugins.register(https_rewrite)
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							plugins.register(infinite_scroll)
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							plugins.register(open_results_on_new_tab)
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							plugins.register(self_info)
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							plugins.register(search_on_category_select)
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							plugins.register(tracker_url_remover)
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							plugins.register(vim_hotkeys)
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