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"""
convert_utf7_to_utf8 used in nametrans
Main code: Rodolfo García Peñas (kix) @thekix
Updated regex by @dnebauer
Please, check https://github.com/OfflineIMAP/offlineimap3/issues/23
for more info.
"""
import re
def convert_utf7_to_utf8(str_imap):
"""
This function converts an IMAP_UTF-7 string object to UTF-8.
It first replaces the ampersand (&) character with plus character (+)
in the cases of UTF-7 character and then decode the string to utf-8.
If the str_imap string is already UTF-8, return it.
For example, "abc&AK4-D" is translated to "abc+AK4-D"
and then, to "abc@D"
Example code:
my_string = "abc&AK4-D"
print(convert_utf7_to_utf8(my_string))
Args:
bytes_imap: IMAP UTF7 string
Returns: UTF-8 string
Source: https://github.com/OfflineIMAP/offlineimap3/issues/23
"""
try:
str_utf7 = re.sub(r'&(\w{3}\-)', '+\\1', str_imap)
str_utf8 = str_utf7.encode('utf-8').decode('utf_7')
return str_utf8
except UnicodeDecodeError:
# error decoding because already utf-8, so return original string
return str_imap
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