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/* eslint-disable no-undef -- This file serves as a compatibility layer between environments */
/**
* This works the same as `Buffer.from(input).toString('base64')`
* to work on both Node.js and browser environment.
*
* @internal
*
* @param input The string to encode to Base64.
*
* @returns Base64 encoded string.
*
* @see https://datatracker.ietf.org/doc/html/rfc4648
*
* @example const encodedHeader = toBase64(JSON.stringify(header));
*/
export const toBase64: (input: string) => string =
typeof Buffer === 'undefined' || !bufferFeatureCheck('base64')
? (input) => {
const utf8Bytes = new TextEncoder().encode(input);
const binaryString = Array.from(utf8Bytes, (byte) =>
String.fromCodePoint(byte)
).join('');
return btoa(binaryString);
}
: (input) => Buffer.from(input).toString('base64');
/**
* This works the same as `Buffer.from(input).toString('base64url')`
* to work on both Node.js and browser environment.
*
* @internal
*
* @param input The string to encode to Base64 URL.
*
* @returns Base64 URL encoded string.
*
* @see https://datatracker.ietf.org/doc/html/rfc4648
*
* @example const encodedHeader = toBase64Url(JSON.stringify(header));
*/
export const toBase64Url: (input: string) => string =
typeof Buffer === 'undefined' || !bufferFeatureCheck('base64url')
? (input) =>
toBase64(input)
.replaceAll('+', '-')
.replaceAll('/', '_')
.replaceAll(/=+$/g, '')
: (input) => Buffer.from(input).toString('base64url');
/**
* Checks whether the environment supports the given encoding on the `Buffer` class.
* This is required because some `Buffer` polyfills do not support all encodings.
*
* @param encoding The encoding to check.
*
* @see https://www.npmjs.com/package/buffer
* @see https://github.com/feross/buffer/issues/309
*/
function bufferFeatureCheck(encoding: BufferEncoding): boolean {
try {
return typeof Buffer.from('test').toString(encoding) === 'string';
} catch {
return false;
}
}
|
