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Remove a Python 2-ism and improve type hints. (#11699)

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On Python 2, indexing a byte-string gives back a byte-string,
while on Python 3 it gives back the ASCII equivalent as an int.
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Patrick Cloke 2022-01-06 13:08:48 -05:00 committed by GitHub
parent 70ce9aea71
commit 201c48c8de
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2 changed files with 8 additions and 12 deletions
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1
changelog.d/11699.misc Normal file
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@ -0,0 +1 @@
Remove fallback code for Python 2.

19
synapse/types.py
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@ -21,6 +21,7 @@ from typing import (
ClassVar,
Dict,
Mapping,
Match,
MutableMapping,
Optional,
Tuple,
@ -380,7 +381,7 @@ def map_username_to_mxid_localpart(
onto different mxids
Returns:
unicode: string suitable for a mxid localpart
string suitable for a mxid localpart
"""
if not isinstance(username, bytes):
username = username.encode("utf-8")
@ -388,29 +389,23 @@ def map_username_to_mxid_localpart(
# first we sort out upper-case characters
if case_sensitive:
def f1(m):
def f1(m: Match[bytes]) -> bytes:
return b"_" + m.group().lower()
username = UPPER_CASE_PATTERN.sub(f1, username)
else:
username = username.lower()
# then we sort out non-ascii characters
def f2(m):
g = m.group()[0]
if isinstance(g, str):
# on python 2, we need to do a ord(). On python 3, the
# byte itself will do.
g = ord(g)
return b"=%02x" % (g,)
# then we sort out non-ascii characters by converting to the hex equivalent.
def f2(m: Match[bytes]) -> bytes:
return b"=%02x" % (m.group()[0],)
username = NON_MXID_CHARACTER_PATTERN.sub(f2, username)
# we also do the =-escaping to mxids starting with an underscore.
username = re.sub(b"^_", b"=5f", username)
# we should now only have ascii bytes left, so can decode back to a
# unicode.
# we should now only have ascii bytes left, so can decode back to a string.
return username.decode("ascii")