formats.exposed/public/common/base64url.js

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2023-08-01 14:20:57 +00:00
// @ts-check
/**
* Convert a `Uint8Array` to a URL-safe base64 string.
* @param {Uint8Array} bytes
* @returns {string}
*/
export const stringify = (bytes) => {
const string = String.fromCharCode(...bytes);
const base64 = btoa(string);
return base64
.replaceAll("+", "-")
.replaceAll("/", "_")
.replaceAll("=", "");
};
/**
* Convert a URL-safe base64 string to a `Uint8Array`.
* Returns `null` if the string is invalid.
* @param {string} text
* @returns {null | Uint8Array}
*/
export const parse = (text) => {
const normalizedText = text
.replaceAll("-", "+")
.replaceAll("_", "/")
.replaceAll(" ", "+");
try {
const string = atob(normalizedText);
const bytes = new Uint8Array(string.length);
for (let i = 0; i < string.length; i++) {
bytes[i] = string.charCodeAt(i);
}
return bytes;
} catch (_err) {
return null;
}
};