forked from rDrama/rDrama
36 lines
971 B
JavaScript
36 lines
971 B
JavaScript
let random = bytes =>
|
|
Promise.resolve(crypto.getRandomValues(new Uint8Array(bytes)))
|
|
let customAlphabet = (alphabet, size) => {
|
|
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 = crypto.getRandomValues(new Uint8Array(step))
|
|
let i = step
|
|
while (i--) {
|
|
id += alphabet[bytes[i] & mask] || ''
|
|
if (id.length === size) return Promise.resolve(id)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
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 Promise.resolve(id)
|
|
}
|
|
export { nanoid, customAlphabet, random }
|