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