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imap_utf7.py
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imap_utf7.py
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# The contents of this file has been derived code from the Twisted project
# (http:https://twistedmatrix.com/). The original author is Jp Calderone.
# Twisted project license follows:
# 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.
# Modified for Pytho3: using str only
class FolderNameError(ValueError):
pass
stdPattern=list(range(0x20, 0x2)) + list(range(0x27, 0x7f))
def encode(s):
if isinstance(s, str) and sum(n for n in (ord(c) for c in s) if n > 127):
raise FolderNameError("%r contains characters not valid in a str folder name. "
"Convert to unicode first?" % s)
r = []
_in = []
for c in s:
if ord(c) in stdPattern:
if _in:
r.extend(['&', modified_base64(''.join(_in)), '-'])
del _in[:]
r.append(str(c))
elif c == '&':
if _in:
r.extend(['&', modified_base64(''.join(_in)), '-'])
del _in[:]
r.append('&-')
else:
_in.append(c)
if _in:
r.extend(['&', modified_base64(''.join(_in)), '-'])
return ''.join(r)
def decode(s):
r = []
decode = []
for c in s:
if c == '&' and not decode:
decode.append('&')
elif c == '-' and decode:
if len(decode) == 1:
r.append('&')
else:
r.append(modified_unbase64(''.join(decode[1:])))
decode = []
elif decode:
decode.append(c)
else:
r.append(c)
if decode:
r.append(modified_unbase64(''.join(decode[1:])))
out = ''.join(r)
# if not isinstance(out, str):
# out =out.decode('latin-1')
return out
def modified_base64(s):
s_utf7 = s.encode('utf-7').decode()
return s_utf7[1:-1].replace('/', ',')
def modified_unbase64(s):
s_utf7 = '+' + s.replace(',', '/') + '-'
return s_utf7.encode().decode('utf-7')