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denoland-deno/extensions/web/05_base64.js
Bartek Iwańczuk 1aac47720b
refactor: use primordials in extensions/web (#11273)
Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>
2021-07-06 14:38:12 +02:00

72 lines
1.8 KiB
JavaScript

// Copyright 2018-2021 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" />
"use strict";
((window) => {
const webidl = window.__bootstrap.webidl;
const {
forgivingBase64Encode,
forgivingBase64Decode,
} = window.__bootstrap.infra;
const { DOMException } = window.__bootstrap.domException;
const {
ArrayPrototypeMap,
StringPrototypeCharCodeAt,
ArrayPrototypeJoin,
StringFromCharCode,
TypedArrayFrom,
} = window.__bootstrap.primordials;
/**
* @param {string} data
* @returns {string}
*/
function atob(data) {
data = webidl.converters.DOMString(data, {
prefix: "Failed to execute 'atob'",
context: "Argument 1",
});
const uint8Array = forgivingBase64Decode(data);
const result = ArrayPrototypeMap(
[...uint8Array],
(byte) => StringFromCharCode(byte),
);
return ArrayPrototypeJoin(result, "");
}
/**
* @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",
});
const byteArray = ArrayPrototypeMap([...data], (char) => {
const charCode = StringPrototypeCharCodeAt(char, 0);
if (charCode > 0xff) {
throw new DOMException(
"The string to be encoded contains characters outside of the Latin1 range.",
"InvalidCharacterError",
);
}
return charCode;
});
return forgivingBase64Encode(TypedArrayFrom(Uint8Array, byteArray));
}
window.__bootstrap.base64 = {
atob,
btoa,
};
})(globalThis);