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Workaround the sad state of base64 web APIs

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This is necessary to make usernames/passwords with UTF-8 in them
work correctly.
This commit is contained in:
Simon Ser 2022-06-24 23:58:12 +02:00
parent 8e30806fec
commit 505a6fd5ab
2 changed files with 45 additions and 2 deletions
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42
lib/base64.js Normal file
View file

@ -0,0 +1,42 @@
const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/* The JS world is still in the stone age. We're in 2022 and we still don't
* have the technology to correctly base64-encode a UTF-8 string. Can't wait
* the next industrial revolution.
*
* For more info, see:
* https://developer.mozilla.org/en-US/docs/Glossary/Base64#the_unicode_problem
*/
export function encode(data) {
if (!window.TextEncoder) {
return btoa(data);
}
var encoder = new TextEncoder();
var bytes = encoder.encode(data);
var trailing = bytes.length % 3;
var out = "";
for (var i = 0; i < bytes.length - trailing; i += 3) {
var u24 = (bytes[i] << 16) + (bytes[i + 1] << 8) + bytes[i + 2];
out += alphabet[(u24 >> 18) & 0x3F];
out += alphabet[(u24 >> 12) & 0x3F];
out += alphabet[(u24 >> 6) & 0x3F];
out += alphabet[u24 & 0x3F];
}
if (trailing == 1) {
var u8 = bytes[bytes.length - 1];
out += alphabet[u8 >> 2];
out += alphabet[(u8 << 4) & 0x3F];
out += "==";
} else if (trailing == 2) {
var u16 = (bytes[bytes.length - 2] << 8) + bytes[bytes.length - 1];
out += alphabet[u16 >> 10];
out += alphabet[(u16 >> 4) & 0x3F];
out += alphabet[(u16 << 2) & 0x3F];
out += "=";
}
return out;
}

5
lib/client.js
View file

@ -1,4 +1,5 @@
import * as irc from "./irc.js";
import * as base64 from "./base64.js";
// Static list of capabilities that are always requested when supported by the
// server
@ -460,11 +461,11 @@ export default class Client extends EventTarget {
let initialResp = null;
switch (mechanism) {
case "PLAIN":
let respStr = btoa("\0" + params.username + "\0" + params.password);
let respStr = base64.encode("\0" + params.username + "\0" + params.password);
initialResp = { command: "AUTHENTICATE", params: [respStr] };
break;
case "EXTERNAL":
initialResp = { command: "AUTHENTICATE", params: [btoa("")] };
initialResp = { command: "AUTHENTICATE", params: [base64.encode("")] };
break;
default:
throw new Error(`Unknown authentication mechanism '${mechanism}'`);