@simplewebauthn/server
Version:
SimpleWebAuthn for Servers
90 lines (89 loc) • 2.49 kB
JavaScript
;
/**
* A runtime-agnostic collection of methods for working with Uint8Arrays
* @module
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.areEqual = areEqual;
exports.toHex = toHex;
exports.fromHex = fromHex;
exports.concat = concat;
exports.toUTF8String = toUTF8String;
exports.fromUTF8String = fromUTF8String;
exports.fromASCIIString = fromASCIIString;
exports.toDataView = toDataView;
/**
* Make sure two Uint8Arrays are deeply equivalent
*/
function areEqual(array1, array2) {
if (array1.length != array2.length) {
return false;
}
return array1.every((val, i) => val === array2[i]);
}
/**
* Convert a Uint8Array to Hexadecimal.
*
* A replacement for `Buffer.toString('hex')`
*/
function toHex(array) {
const hexParts = Array.from(array, (i) => i.toString(16).padStart(2, '0'));
// adce000235bcc60a648b0b25f1f05503
return hexParts.join('');
}
/**
* Convert a hexadecimal string to isoUint8Array.
*
* A replacement for `Buffer.from('...', 'hex')`
*/
function fromHex(hex) {
if (!hex) {
return Uint8Array.from([]);
}
const isValid = hex.length !== 0 && hex.length % 2 === 0 &&
!/[^a-fA-F0-9]/u.test(hex);
if (!isValid) {
throw new Error('Invalid hex string');
}
const byteStrings = hex.match(/.{1,2}/g) ?? [];
return Uint8Array.from(byteStrings.map((byte) => parseInt(byte, 16)));
}
/**
* Combine multiple Uint8Arrays into a single Uint8Array
*/
function concat(arrays) {
let pointer = 0;
const totalLength = arrays.reduce((prev, curr) => prev + curr.length, 0);
const toReturn = new Uint8Array(totalLength);
arrays.forEach((arr) => {
toReturn.set(arr, pointer);
pointer += arr.length;
});
return toReturn;
}
/**
* Convert bytes into a UTF-8 string
*/
function toUTF8String(array) {
const decoder = new globalThis.TextDecoder('utf-8');
return decoder.decode(array);
}
/**
* Convert a UTF-8 string back into bytes
*/
function fromUTF8String(utf8String) {
const encoder = new globalThis.TextEncoder();
return encoder.encode(utf8String);
}
/**
* Convert an ASCII string to Uint8Array
*/
function fromASCIIString(value) {
return Uint8Array.from(value.split('').map((x) => x.charCodeAt(0)));
}
/**
* Prepare a DataView we can slice our way around in as we parse the bytes in a Uint8Array
*/
function toDataView(array) {
return new DataView(array.buffer, array.byteOffset, array.length);
}