| | |
| | | let { urlAlphabet } = require('./url-alphabet/index.cjs') |
| | | if (process.env.NODE_ENV !== 'production') { |
| | | 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 customRandom = (alphabet, defaultSize, getRandom) => { |
| | | let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1 |
| | | let step = -~((1.6 * mask * size) / alphabet.length) |
| | | return () => { |
| | | let step = -~((1.6 * mask * defaultSize) / alphabet.length) |
| | | return (size = defaultSize) => { |
| | | let id = '' |
| | | while (true) { |
| | | let bytes = getRandom(step) |
| | |
| | | } |
| | | } |
| | | } |
| | | 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 |
| | | let customAlphabet = (alphabet, size = 21) => |
| | | customRandom(alphabet, size, random) |
| | | let nanoid = (size = 21) => |
| | | crypto.getRandomValues(new Uint8Array(size)).reduce((id, byte) => { |
| | | byte &= 63 |
| | | if (byte < 36) { |
| | | id += byte.toString(36) |
| | | } else if (byte < 62) { |
| | | id += (byte - 26).toString(36).toUpperCase() |
| | | } else if (byte < 63) { |
| | | id += '_' |
| | | } else { |
| | | } else if (byte > 62) { |
| | | id += '-' |
| | | } else { |
| | | id += '_' |
| | | } |
| | | } |
| | | return id |
| | | } |
| | | return id |
| | | }, '') |
| | | module.exports = { nanoid, customAlphabet, customRandom, urlAlphabet, random } |