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import { base64 } from '../../deps.ts';
import type { Base64URLString } from '../../deps.ts';
/**
* Decode from a Base64URL-encoded string to an ArrayBuffer. Best used when converting a
* credential ID from a JSON string to an ArrayBuffer, like in allowCredentials or
* excludeCredentials.
*
* @param buffer Value to decode from base64
* @param to (optional) The decoding to use, in case it's desirable to decode from base64 instead
*/
export function toBuffer(
base64urlString: string,
from: 'base64' | 'base64url' = 'base64url',
): Uint8Array {
const _buffer = base64.toArrayBuffer(base64urlString, from === 'base64url');
return new Uint8Array(_buffer);
}
/**
* Encode the given array buffer into a Base64URL-encoded string. Ideal for converting various
* credential response ArrayBuffers to string for sending back to the server as JSON.
*
* @param buffer Value to encode to base64
* @param to (optional) The encoding to use, in case it's desirable to encode to base64 instead
*/
export function fromBuffer(
buffer: Uint8Array,
to: 'base64' | 'base64url' = 'base64url',
): string {
return base64.fromArrayBuffer(buffer, to === 'base64url');
}
/**
* Convert a base64url string into base64
*/
export function toBase64(base64urlString: string): string {
const fromBase64Url = base64.toArrayBuffer(base64urlString, true);
const toBase64 = base64.fromArrayBuffer(fromBase64Url);
return toBase64;
}
/**
* Encode a UTF-8 string to base64url
*/
export function fromUTF8String(utf8String: string): string {
return base64.fromString(utf8String, true);
}
/**
* Decode a base64url string into its original UTF-8 string
*/
export function toUTF8String(base64urlString: string): string {
return base64.toString(base64urlString, true);
}
/**
* Confirm that the string is encoded into base64
*/
export function isBase64(input: string): boolean {
return base64.validate(input, false);
}
/**
* Confirm that the string is encoded into base64url, with support for optional padding
*/
export function isBase64URL(input: string): boolean {
// Trim padding characters from the string if present
input = trimPadding(input);
return base64.validate(input, true);
}
/**
* Remove optional padding from a base64url-encoded string
*/
export function trimPadding(input: Base64URLString): Base64URLString {
return input.replace(/=/g, '');
}
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