zulip/zerver/lib/string_validation.py

69 lines
2.1 KiB
Python

import unicodedata
from django.utils.translation import gettext as _
from zerver.lib.exceptions import JsonableError
from zerver.models import Stream
# There are 66 Unicode non-characters; see
# https://www.unicode.org/faq/private_use.html#nonchar4
unicode_non_chars = {
chr(x)
for r in [
range(0xFDD0, 0xFDF0), # FDD0 through FDEF, inclusive
range(0xFFFE, 0x110000, 0x10000), # 0xFFFE, 0x1FFFE, ... 0x10FFFE inclusive
range(0xFFFF, 0x110000, 0x10000), # 0xFFFF, 0x1FFFF, ... 0x10FFFF inclusive
]
for x in r
}
def is_character_printable(char: str) -> bool:
unicode_category = unicodedata.category(char)
if (unicode_category in ["Cc", "Cs"]) or char in unicode_non_chars:
return False
return True
def check_string_is_printable(var: str) -> int | None:
# Return position (1-indexed!) of the character which is not
# printable, None if no such character is present.
for i, char in enumerate(var):
if not is_character_printable(char):
return i + 1
return None
def check_stream_name(stream_name: str) -> None:
if stream_name.strip() == "":
raise JsonableError(_("Channel name can't be empty."))
if len(stream_name) > Stream.MAX_NAME_LENGTH:
raise JsonableError(
_("Channel name too long (limit: {max_length} characters).").format(
max_length=Stream.MAX_NAME_LENGTH
)
)
invalid_character_pos = check_string_is_printable(stream_name)
if invalid_character_pos is not None:
raise JsonableError(
_("Invalid character in channel name, at position {position}.").format(
position=invalid_character_pos
)
)
def check_stream_topic(topic_name: str) -> None:
if topic_name.strip() == "":
raise JsonableError(_("Topic can't be empty!"))
invalid_character_pos = check_string_is_printable(topic_name)
if invalid_character_pos is not None:
raise JsonableError(
_("Invalid character in topic, at position {position}!").format(
position=invalid_character_pos
)
)