denoland-deno/ext/web/05_base64.js

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.

// @ts-check
/// <reference path="../../core/internal.d.ts" />
/// <reference path="../webidl/internal.d.ts" />
/// <reference path="../web/internal.d.ts" />
/// <reference lib="esnext" />

const core = globalThis.Deno.core;
const ops = core.ops;
import * as webidl from "internal:deno_webidl/00_webidl.js";
import DOMException from "internal:deno_web/01_dom_exception.js";
const primordials = globalThis.__bootstrap.primordials;
const {
  ObjectPrototypeIsPrototypeOf,
  TypeErrorPrototype,
} = primordials;

/**
 * @param {string} data
 * @returns {string}
 */
function atob(data) {
  const prefix = "Failed to execute 'atob'";
  webidl.requiredArguments(arguments.length, 1, { prefix });
  data = webidl.converters.DOMString(data, {
    prefix,
    context: "Argument 1",
  });
  try {
    return ops.op_base64_atob(data);
  } catch (e) {
    if (ObjectPrototypeIsPrototypeOf(TypeErrorPrototype, e)) {
      throw new DOMException(
        "Failed to decode base64: invalid character",
        "InvalidCharacterError",
      );
    }
    throw e;
  }
}

/**
 * @param {string} data
 * @returns {string}
 */
function btoa(data) {
  const prefix = "Failed to execute 'btoa'";
  webidl.requiredArguments(arguments.length, 1, { prefix });
  data = webidl.converters.DOMString(data, {
    prefix,
    context: "Argument 1",
  });
  try {
    return ops.op_base64_btoa(data);
  } catch (e) {
    if (ObjectPrototypeIsPrototypeOf(TypeErrorPrototype, e)) {
      throw new DOMException(
        "The string to be encoded contains characters outside of the Latin1 range.",
        "InvalidCharacterError",
      );
    }
    throw e;
  }
}

export { atob, btoa };