From da485e523913df28def6335be0836b1fc437617f Mon Sep 17 00:00:00 2001 From: Owen Jacobson Date: Tue, 29 Oct 2024 19:32:30 -0400 Subject: Restrict login names. There's no good reason to use an empty string as your login name, or to use one so long as to annoy others. Names beginning or ending with whitespace, or containing runs of whitespace, are also a technical problem, so they're also prohibited. This change does not implement [UTS #39], as I haven't yet fully understood how to do so. [UTS #39]: https://www.unicode.org/reports/tr39/ --- src/login/validate.rs | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 src/login/validate.rs (limited to 'src/login/validate.rs') diff --git a/src/login/validate.rs b/src/login/validate.rs new file mode 100644 index 0000000..ed3eff8 --- /dev/null +++ b/src/login/validate.rs @@ -0,0 +1,23 @@ +use unicode_segmentation::UnicodeSegmentation as _; + +use crate::name::Name; + +// Picked out of a hat. The power of two is not meaningful. +const NAME_TOO_LONG: usize = 64; + +pub fn name(name: &Name) -> bool { + let display = name.display(); + + [ + display.graphemes(true).count() < NAME_TOO_LONG, + display.chars().all(|ch| !ch.is_control()), + display.chars().next().is_some_and(char::is_alphanumeric), + display.chars().last().is_some_and(char::is_alphanumeric), + display + .chars() + .zip(display.chars().skip(1)) + .all(|(a, b)| !(a.is_whitespace() && b.is_whitespace())), + ] + .into_iter() + .all(|value| value) +} -- cgit v1.2.3