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Make atob follow the spec (#2242)

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迷渡 2019-05-01 02:25:37 +08:00 • committed by Ryan Dahl
parent a217e55fec
commit bbeb30fc5e
2 changed files with 53 additions and 8 deletions
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24
js/text_encoding.ts
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@ -176,20 +176,28 @@ class UTF8Encoder implements Encoder {
/** Decodes a string of data which has been encoded using base-64. */
export function atob(s: string): string {
const rem = s.length % 4;
// base64-js requires length exactly times of 4
if (rem > 0) {
s = s.padEnd(s.length + (4 - rem), "=");
s = String(s);
s = s.replace(/[\t\n\f\r ]/g, "");
if (s.length % 4 === 0) {
s = s.replace(/==?$/, "");
}
let byteArray;
try {
byteArray = base64.toByteArray(s);
} catch (_) {
const rem = s.length % 4;
if (rem === 1 || /[^+/0-9A-Za-z]/.test(s)) {
// TODO: throw `DOMException`
throw new DenoError(
ErrorKind.InvalidInput,
"The string to be decoded is not correctly encoded"
);
}
// base64-js requires length exactly times of 4
if (rem > 0) {
s = s.padEnd(s.length + (4 - rem), "=");
}
const byteArray: Uint8Array = base64.toByteArray(s);
let result = "";
for (let i = 0; i < byteArray.length; i++) {
result += String.fromCharCode(byteArray[i]);