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Improved validation of display names (Fixes #3436) (#3437)

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* Fixed validation of display names

Fixed validation of display names: reject names beginning with invisible unicode characters.

* Formatting

Formatting fix.

* Expanded list of forbidden Unicode characters. Validation now checks for disallowed characters anywhere in the name.

* Formatting

* Added a comment detailing source of the list of invisible chars.
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Josephos 2023-07-04 12:41:58 +02:00 committed by GitHub
parent 8bcf2ea7c9
commit cdc5b47886
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 58 additions and 2 deletions
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60
crates/utils/src/utils/validation.rs
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@ -24,6 +24,62 @@ const BIO_MAX_LENGTH: usize = 300;
const SITE_NAME_MAX_LENGTH: usize = 20;
const SITE_NAME_MIN_LENGTH: usize = 1;
const SITE_DESCRIPTION_MAX_LENGTH: usize = 150;
//Invisible unicode characters, taken from https://invisible-characters.com/
const FORBIDDEN_DISPLAY_CHARS: [char; 53] = [
'\u{0009}',
'\u{00a0}',
'\u{00ad}',
'\u{034f}',
'\u{061c}',
'\u{115f}',
'\u{1160}',
'\u{17b4}',
'\u{17b5}',
'\u{180e}',
'\u{2000}',
'\u{2001}',
'\u{2002}',
'\u{2003}',
'\u{2004}',
'\u{2005}',
'\u{2006}',
'\u{2007}',
'\u{2008}',
'\u{2009}',
'\u{200a}',
'\u{200b}',
'\u{200c}',
'\u{200d}',
'\u{200e}',
'\u{200f}',
'\u{202f}',
'\u{205f}',
'\u{2060}',
'\u{2061}',
'\u{2062}',
'\u{2063}',
'\u{2064}',
'\u{206a}',
'\u{206b}',
'\u{206c}',
'\u{206d}',
'\u{206e}',
'\u{206f}',
'\u{3000}',
'\u{2800}',
'\u{3164}',
'\u{feff}',
'\u{ffa0}',
'\u{1d159}',
'\u{1d173}',
'\u{1d174}',
'\u{1d175}',
'\u{1d176}',
'\u{1d177}',
'\u{1d178}',
'\u{1d179}',
'\u{1d17a}',
];
fn has_newline(name: &str) -> bool {
name.contains('\n')
@ -42,8 +98,8 @@ pub fn is_valid_actor_name(name: &str, actor_name_max_length: usize) -> LemmyRes
// Can't do a regex here, reverse lookarounds not supported
pub fn is_valid_display_name(name: &str, actor_name_max_length: usize) -> LemmyResult<()> {
let check = !name.starts_with('@')
&& !name.starts_with('\u{200b}')
let check = !name.contains(FORBIDDEN_DISPLAY_CHARS)
&& !name.starts_with('@')
&& name.chars().count() >= 3
&& name.chars().count() <= actor_name_max_length
&& !has_newline(name);