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fix(nip05): allow hyphens and periods in usernames per NIP-05 spec

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NIP-05 spec states local-part MUST only use characters a-z0-9-_.
The previous regex /^[a-z][a-z0-9_]*$/ rejected hyphens and periods.
Updated to /^[a-z][a-z0-9._-]*[a-z0-9]$/ and added support for the
root identifier "_" (_@domain) as described in the spec.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Patrick Mulligan 2026-04-01 13:25:06 -04:00
parent 883bb71116
commit 7dd767a78a
1 changed files with 13 additions and 5 deletions
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18
src/extensions/nip05/managers/nip05Manager.ts
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@ -55,10 +55,12 @@ function generateId(): string {
}
/**
* Validate username format
* - Lowercase alphanumeric and underscore only
* Validate username format per NIP-05 spec
* - Characters allowed: a-z, 0-9, hyphen (-), underscore (_), period (.)
* - Must start with a letter
* - Must not end with a hyphen, underscore, or period
* - Length within bounds
* - Special case: "_" alone is the root identifier (_@domain)
*/
function validateUsername(username: string, config: Required<Nip05Config>): UsernameValidation {
if (!username) {
@ -67,6 +69,11 @@ function validateUsername(username: string, config: Required<Nip05Config>): User
const normalized = username.toLowerCase().trim()
// Special case: root identifier "_" per NIP-05
if (normalized === '_') {
return { valid: true }
}
if (normalized.length < config.min_username_length) {
return { valid: false, error: `Username must be at least ${config.min_username_length} character(s)` }
}
@ -75,9 +82,10 @@ function validateUsername(username: string, config: Required<Nip05Config>): User
return { valid: false, error: `Username must be at most ${config.max_username_length} characters` }
}
// Only lowercase letters, numbers, and underscores
if (!/^[a-z][a-z0-9_]*$/.test(normalized)) {
return { valid: false, error: 'Username must start with a letter and contain only lowercase letters, numbers, and underscores' }
// NIP-05 spec: local-part MUST only use characters a-z0-9-_.
// Must start with a letter, must not end with separator
if (!/^[a-z][a-z0-9._-]*[a-z0-9]$/.test(normalized) && !/^[a-z]$/.test(normalized)) {
return { valid: false, error: 'Username must start with a letter, end with a letter or number, and contain only a-z, 0-9, hyphens, underscores, and periods' }
}
// Check reserved usernames