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1// Regex from the go implementation
2// https://github.com/bluesky-social/indigo/blob/main/atproto/syntax/handle.go#L10
3import {forceLTR} from '#/lib/strings/bidi'
4
5const VALIDATE_REGEX =
6 /^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$/
7
8export const MAX_SERVICE_HANDLE_LENGTH = 18
9
10export function makeValidHandle(str: string): string {
11 if (str.length > 20) {
12 str = str.slice(0, 20)
13 }
14 str = str.toLowerCase()
15 return str.replace(/^[^a-z0-9]+/g, '').replace(/[^a-z0-9-]/g, '')
16}
17
18export function createFullHandle(name: string, domain: string): string {
19 name = (name || '').replace(/[.]+$/, '')
20 domain = (domain || '').replace(/^[.]+/, '')
21 return `${name}.${domain}`
22}
23
24export function isInvalidHandle(handle: string): boolean {
25 return handle === 'handle.invalid'
26}
27
28export function sanitizeHandle(handle: string, prefix = ''): string {
29 return isInvalidHandle(handle)
30 ? '⚠Invalid Handle'
31 : forceLTR(`${prefix}${handle.toLocaleLowerCase()}`)
32}
33
34export interface IsValidHandle {
35 handleChars: boolean
36 hyphenStartOrEnd: boolean
37 frontLength: boolean
38 totalLength: boolean
39 overall: boolean
40}
41
42// More checks from https://github.com/bluesky-social/atproto/blob/main/packages/pds/src/handle/index.ts#L72
43export function validateServiceHandle(
44 str: string,
45 userDomain: string,
46): IsValidHandle {
47 const fullHandle = createFullHandle(str, userDomain)
48
49 const results = {
50 handleChars:
51 !str || (VALIDATE_REGEX.test(fullHandle) && !str.includes('.')),
52 hyphenStartOrEnd: !str.startsWith('-') && !str.endsWith('-'),
53 frontLength: str.length >= 3 && str.length <= MAX_SERVICE_HANDLE_LENGTH,
54 totalLength: fullHandle.length <= 253,
55 }
56
57 return {
58 ...results,
59 overall: !Object.values(results).includes(false),
60 }
61}