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# SPDX-License-Identifier: AGPL-3.0-or-later
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from searx.data import EXTERNAL_BANGS
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def get_node(external_bangs_db, bang):
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node = external_bangs_db['trie']
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after = ''
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before = ''
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for bang_letter in bang:
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after += bang_letter
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if after in node and isinstance(node, dict):
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node = node[after]
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before += after
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after = ''
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return node, before, after
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def get_bang_definition_and_ac(external_bangs_db, bang):
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node, before, after = get_node(external_bangs_db, bang)
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bang_definition = None
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bang_ac_list = []
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if after != '':
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for k in node:
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if k.startswith(after):
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bang_ac_list.append(before + k)
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elif isinstance(node, dict):
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bang_definition = node.get('*')
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bang_ac_list = [before + k for k in node.keys() if k != '*']
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elif isinstance(node, str):
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bang_definition = node
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bang_ac_list = []
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return bang_definition, bang_ac_list
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def resolve_bang_definition(bang_definition, query):
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url, rank = bang_definition.split(chr(1))
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url = url.replace(chr(2), query)
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if url.startswith('//'):
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url = 'https:' + url
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rank = int(rank) if len(rank) > 0 else 0
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return (url, rank)
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def get_bang_definition_and_autocomplete(bang, external_bangs_db=None):
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if external_bangs_db is None:
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external_bangs_db = EXTERNAL_BANGS
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bang_definition, bang_ac_list = get_bang_definition_and_ac(external_bangs_db, bang)
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new_autocomplete = []
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current = [*bang_ac_list]
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done = set()
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while len(current) > 0:
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bang_ac = current.pop(0)
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done.add(bang_ac)
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current_bang_definition, current_bang_ac_list = get_bang_definition_and_ac(external_bangs_db, bang_ac)
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if current_bang_definition:
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_, order = resolve_bang_definition(current_bang_definition, '')
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new_autocomplete.append((bang_ac, order))
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for new_bang in current_bang_ac_list:
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if new_bang not in done and new_bang not in current:
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current.append(new_bang)
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new_autocomplete.sort(key=lambda t: (-t[1], t[0]))
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new_autocomplete = list(map(lambda t: t[0], new_autocomplete))
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return bang_definition, new_autocomplete
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def get_bang_url(search_query, external_bangs_db=None):
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"""
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Redirects if the user supplied a correct bang search.
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:param search_query: This is a search_query object which contains preferences and the submitted queries.
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:return: None if the bang was invalid, else a string of the redirect url.
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"""
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if external_bangs_db is None:
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external_bangs_db = EXTERNAL_BANGS
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if search_query.external_bang:
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bang_definition, _ = get_bang_definition_and_ac(external_bangs_db, search_query.external_bang)
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return resolve_bang_definition(bang_definition, search_query.query)[0] if bang_definition else None
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return None
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