mirror of
https://github.com/searxng/searxng.git
synced 2024-08-25 07:20:15 +02:00
These py files are linted by `test.pylint`, all other files are linted by `test.pep8`. Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
159 lines
4.3 KiB
Python
Executable File
159 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python
|
|
# lint: pylint
|
|
"""
|
|
Update searx/data/external_bangs.json using the duckduckgo bangs.
|
|
|
|
https://duckduckgo.com/newbang loads
|
|
* a javascript which provides the bang version ( https://duckduckgo.com/bv1.js )
|
|
* a JSON file which contains the bangs ( https://duckduckgo.com/bang.v260.js for example )
|
|
|
|
This script loads the javascript, then the bangs.
|
|
|
|
The javascript URL may change in the future ( for example https://duckduckgo.com/bv2.js ),
|
|
but most probably it will requires to update RE_BANG_VERSION
|
|
"""
|
|
# pylint: disable=C0116
|
|
|
|
import json
|
|
import re
|
|
from os.path import join
|
|
|
|
import httpx
|
|
|
|
from searx import searx_dir # pylint: disable=E0401 C0413
|
|
|
|
|
|
# from https://duckduckgo.com/newbang
|
|
URL_BV1 = 'https://duckduckgo.com/bv1.js'
|
|
RE_BANG_VERSION = re.compile(r'\/bang\.v([0-9]+)\.js')
|
|
HTTPS_COLON = 'https:'
|
|
HTTP_COLON = 'http:'
|
|
|
|
|
|
def get_bang_url():
|
|
response = httpx.get(URL_BV1)
|
|
response.raise_for_status()
|
|
|
|
r = RE_BANG_VERSION.findall(response.text)
|
|
return f'https://duckduckgo.com/bang.v{r[0]}.js', r[0]
|
|
|
|
|
|
def fetch_ddg_bangs(url):
|
|
response = httpx.get(url)
|
|
response.raise_for_status()
|
|
return json.loads(response.content.decode())
|
|
|
|
|
|
def merge_when_no_leaf(node):
|
|
"""Minimize the number of nodes
|
|
|
|
A -> B -> C
|
|
B is child of A
|
|
C is child of B
|
|
|
|
If there are no C equals to '*', then each C are merged into A
|
|
|
|
For example:
|
|
d -> d -> g -> * (ddg*)
|
|
-> i -> g -> * (dig*)
|
|
becomes
|
|
d -> dg -> *
|
|
-> ig -> *
|
|
"""
|
|
restart = False
|
|
if not isinstance(node, dict):
|
|
return
|
|
|
|
# create a copy of the keys so node can be modified
|
|
keys = list(node.keys())
|
|
|
|
for key in keys:
|
|
if key == '*':
|
|
continue
|
|
|
|
value = node[key]
|
|
value_keys = list(value.keys())
|
|
if '*' not in value_keys:
|
|
for value_key in value_keys:
|
|
node[key + value_key] = value[value_key]
|
|
merge_when_no_leaf(node[key + value_key])
|
|
del node[key]
|
|
restart = True
|
|
else:
|
|
merge_when_no_leaf(value)
|
|
|
|
if restart:
|
|
merge_when_no_leaf(node)
|
|
|
|
|
|
def optimize_leaf(parent, parent_key, node):
|
|
if not isinstance(node, dict):
|
|
return
|
|
|
|
if len(node) == 1 and '*' in node and parent is not None:
|
|
parent[parent_key] = node['*']
|
|
else:
|
|
for key, value in node.items():
|
|
optimize_leaf(node, key, value)
|
|
|
|
|
|
def parse_ddg_bangs(ddg_bangs):
|
|
bang_trie = {}
|
|
bang_urls = {}
|
|
|
|
for bang_definition in ddg_bangs:
|
|
# bang_list
|
|
bang_url = bang_definition['u']
|
|
if '{{{s}}}' not in bang_url:
|
|
# ignore invalid bang
|
|
continue
|
|
|
|
bang_url = bang_url.replace('{{{s}}}', chr(2))
|
|
|
|
# only for the https protocol: "https://example.com" becomes "//example.com"
|
|
if bang_url.startswith(HTTPS_COLON + '//'):
|
|
bang_url = bang_url[len(HTTPS_COLON):]
|
|
|
|
#
|
|
if bang_url.startswith(HTTP_COLON + '//') and bang_url[len(HTTP_COLON):] in bang_urls:
|
|
# if the bang_url uses the http:// protocol, and the same URL exists in https://
|
|
# then reuse the https:// bang definition. (written //example.com)
|
|
bang_def_output = bang_urls[bang_url[len(HTTP_COLON):]]
|
|
else:
|
|
# normal use case : new http:// URL or https:// URL (without "https:", see above)
|
|
bang_rank = str(bang_definition['r'])
|
|
bang_def_output = bang_url + chr(1) + bang_rank
|
|
bang_def_output = bang_urls.setdefault(bang_url, bang_def_output)
|
|
|
|
bang_urls[bang_url] = bang_def_output
|
|
|
|
# bang name
|
|
bang = bang_definition['t']
|
|
|
|
# bang_trie
|
|
t = bang_trie
|
|
for bang_letter in bang:
|
|
t = t.setdefault(bang_letter, {})
|
|
t = t.setdefault('*', bang_def_output)
|
|
|
|
# optimize the trie
|
|
merge_when_no_leaf(bang_trie)
|
|
optimize_leaf(None, None, bang_trie)
|
|
|
|
return bang_trie
|
|
|
|
|
|
def get_bangs_filename():
|
|
return join(join(searx_dir, "data"), "external_bangs.json")
|
|
|
|
|
|
if __name__ == '__main__':
|
|
bangs_url, bangs_version = get_bang_url()
|
|
print(f'fetch bangs from {bangs_url}')
|
|
output = {
|
|
'version': bangs_version,
|
|
'trie': parse_ddg_bangs(fetch_ddg_bangs(bangs_url))
|
|
}
|
|
with open(get_bangs_filename(), 'w') as fp:
|
|
json.dump(output, fp, ensure_ascii=False, indent=4)
|