102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
package user
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import (
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"strings"
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)
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// SanitizeForUsername coerces an arbitrary profile string into a candidate
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// that matches usernameRE: lowercase ASCII alphanumerics, `_`, and `-`,
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// length <= 30, with an alphanumeric first character. Returns "" when no
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// usable handle can be derived.
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func SanitizeForUsername(s string) string {
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s = strings.ToLower(strings.TrimSpace(s))
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if s == "" {
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return ""
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}
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var b strings.Builder
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b.Grow(len(s))
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prevSep := false
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for _, r := range s {
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switch {
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case (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9'):
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b.WriteRune(r)
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prevSep = false
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case r == '-' || r == '_':
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if b.Len() == 0 {
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continue
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}
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if prevSep {
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continue
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}
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b.WriteRune(r)
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prevSep = true
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default:
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if b.Len() == 0 {
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continue
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}
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if prevSep {
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continue
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}
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b.WriteRune('_')
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prevSep = true
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}
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}
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out := strings.TrimRight(b.String(), "_-")
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if len(out) > 30 {
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out = strings.TrimRight(out[:30], "_-")
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}
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return out
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}
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// nip05LocalPart returns the local part of a NIP-05 identifier (`local@domain`)
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// when its domain matches `serviceDomain` (case-insensitive). The bare form
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// `local` (no `@`) per NIP-05 implies `_@domain`, which we ignore for sync
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// since we cannot prove the domain match.
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func nip05LocalPart(nip05, serviceDomain string) string {
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nip05 = strings.TrimSpace(nip05)
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if nip05 == "" || serviceDomain == "" {
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return ""
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}
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at := strings.LastIndex(nip05, "@")
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if at <= 0 || at == len(nip05)-1 {
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return ""
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}
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local := nip05[:at]
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domain := nip05[at+1:]
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if !strings.EqualFold(domain, serviceDomain) {
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return ""
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}
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return local
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}
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// CandidateFromMetadata returns a sanitized, validated username derived from a
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// kind:0 profile, or "" if no field yields a usable handle. Precedence:
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// 1. NIP-05 local part when its domain matches serviceDomain.
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// 2. `name` (NIP-01).
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// 3. `display_name` / `displayName` (NIP-24).
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// 4. Deprecated `username` field.
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func CandidateFromMetadata(name, displayName, displayNameAlt, username, nip05, serviceDomain string, reserved []string) string {
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tryFields := []string{
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nip05LocalPart(nip05, serviceDomain),
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name,
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displayName,
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displayNameAlt,
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username,
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}
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for _, raw := range tryFields {
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if raw == "" {
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continue
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}
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c := SanitizeForUsername(raw)
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if c == "" {
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continue
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}
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if err := ValidateUsername(c, reserved); err != nil {
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continue
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}
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return c
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}
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return ""
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}
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