Signal-Desktop/ts/util/webSafeBase64.ts

26 lines
691 B
TypeScript

// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
export function toWebSafeBase64(base64: string): string {
return base64.replace(/\//g, '_').replace(/\+/g, '-').replace(/=/g, '');
}
export function fromWebSafeBase64(webSafeBase64: string): string {
const base64 = webSafeBase64.replace(/_/g, '/').replace(/-/g, '+');
// Ensure that the character count is a multiple of four, filling in the extra
// space needed with '='
const remainder = base64.length % 4;
if (remainder === 3) {
return `${base64}=`;
}
if (remainder === 2) {
return `${base64}==`;
}
if (remainder === 1) {
return `${base64}===`;
}
return base64;
}