63 lines
1.9 KiB
JavaScript
Executable file
63 lines
1.9 KiB
JavaScript
Executable file
import { urlAlphabet } from './url-alphabet/index.js'
|
||
if (false) {
|
||
if (
|
||
typeof navigator !== 'undefined' &&
|
||
navigator.product === 'ReactNative' &&
|
||
typeof crypto === 'undefined'
|
||
) {
|
||
throw new Error(
|
||
'React Native does not have a built-in secure random generator. ' +
|
||
'If you don’t need unpredictable IDs use `nanoid/non-secure`. ' +
|
||
'For secure IDs, import `react-native-get-random-values` ' +
|
||
'before Nano ID.'
|
||
)
|
||
}
|
||
if (typeof msCrypto !== 'undefined' && typeof crypto === 'undefined') {
|
||
throw new Error(
|
||
'Import file with `if (!window.crypto) window.crypto = window.msCrypto`' +
|
||
' before importing Nano ID to fix IE 11 support'
|
||
)
|
||
}
|
||
if (typeof crypto === 'undefined') {
|
||
throw new Error(
|
||
'Your browser does not have secure random generator. ' +
|
||
'If you don’t need unpredictable IDs, you can use nanoid/non-secure.'
|
||
)
|
||
}
|
||
}
|
||
let random = bytes => crypto.getRandomValues(new Uint8Array(bytes))
|
||
let customRandom = (alphabet, size, getRandom) => {
|
||
let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1
|
||
let step = -~((1.6 * mask * size) / alphabet.length)
|
||
return () => {
|
||
let id = ''
|
||
while (true) {
|
||
let bytes = getRandom(step)
|
||
let j = step
|
||
while (j--) {
|
||
id += alphabet[bytes[j] & mask] || ''
|
||
if (id.length === size) return id
|
||
}
|
||
}
|
||
}
|
||
}
|
||
let customAlphabet = (alphabet, size) => customRandom(alphabet, size, random)
|
||
let nanoid = (size = 21) => {
|
||
let id = ''
|
||
let bytes = crypto.getRandomValues(new Uint8Array(size))
|
||
while (size--) {
|
||
let byte = bytes[size] & 63
|
||
if (byte < 36) {
|
||
id += byte.toString(36)
|
||
} else if (byte < 62) {
|
||
id += (byte - 26).toString(36).toUpperCase()
|
||
} else if (byte < 63) {
|
||
id += '_'
|
||
} else {
|
||
id += '-'
|
||
}
|
||
}
|
||
return id
|
||
}
|
||
export { nanoid, customAlphabet, customRandom, urlAlphabet, random }
|