1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
# Copyright 2014 Mathias Bynens <https://mathiasbynens.be/>
# Copyright 2021 Taneli Hukkinen
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import codecs
import re
REGEX_SEPARATORS = re.compile(r"[\x2E\u3002\uFF0E\uFF61]")
REGEX_NON_ASCII = re.compile(r"[^\0-\x7E]")
def encode(uni: str) -> str:
return codecs.encode(uni, encoding="punycode").decode()
def decode(ascii: str) -> str:
return codecs.decode(ascii, encoding="punycode") # type: ignore[call-overload]
def map_domain(string, fn):
parts = string.split("@")
result = ""
if len(parts) > 1:
# In email addresses, only the domain name should be punycoded. Leave
# the local part (i.e. everything up to `@`) intact.
result = parts[0] + "@"
string = parts[1]
labels = REGEX_SEPARATORS.split(string)
encoded = ".".join(fn(label) for label in labels)
return result + encoded
def to_unicode(obj: str) -> str:
def mapping(obj: str) -> str:
if obj.startswith("xn--"):
return decode(obj[4:].lower())
return obj
return map_domain(obj, mapping)
def to_ascii(obj: str) -> str:
def mapping(obj: str) -> str:
if REGEX_NON_ASCII.search(obj):
return "xn--" + encode(obj)
return obj
return map_domain(obj, mapping)
|
