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/*
This file is part of GNU Taler
(C) 2022-2024 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Imports.
*/
import { base64FromArrayBuffer } from "../base64.js";
import { encodeCrock, getRandomBytes, stringToBytes } from "../taler-crypto.js";
import { AccessToken, LongPollParams, PaginationParams } from "./types.js";
/**
* Helper function to generate the "Authorization" HTTP header.
*/
export function makeBasicAuthHeader(
username: string,
password: string,
): string {
const auth = `${username}:${password}`;
const authEncoded: string = base64FromArrayBuffer(stringToBytes(auth));
return `Basic ${authEncoded}`;
}
/**
* rfc8959
* @param token
* @returns
*/
export function makeBearerTokenAuthHeader(token: AccessToken): string {
return `Bearer ${token}`;
}
/**
* https://bugs.gnunet.org/view.php?id=7949
*/
export function addPaginationParams(url: URL, pagination?: PaginationParams) {
if (!pagination) return;
if (pagination.offset) {
url.searchParams.set("start", pagination.offset);
}
const order = !pagination || pagination.order === "asc" ? 1 : -1;
const limit =
!pagination || !pagination.limit || pagination.limit === 0
? 5
: Math.abs(pagination.limit);
//always send delta
url.searchParams.set("delta", String(order * limit));
}
export function addMerchantPaginationParams(
url: URL,
pagination?: PaginationParams,
) {
if (!pagination) return;
if (pagination.offset) {
url.searchParams.set("offset", pagination.offset);
}
const order = !pagination || pagination.order === "asc" ? 1 : -1;
const limit =
!pagination || !pagination.limit || pagination.limit === 0
? 5
: Math.abs(pagination.limit);
//always send delta
url.searchParams.set("limit", String(order * limit));
}
export function addLongPollingParam(url: URL, param?: LongPollParams) {
if (!param) return;
if (param.timeoutMs) {
url.searchParams.set("long_poll_ms", String(param.timeoutMs));
}
}
export interface CacheEvictor<T> {
notifySuccess: (op: T) => Promise<void>;
}
export const nullEvictor: CacheEvictor<unknown> = {
notifySuccess: () => Promise.resolve(),
};
export class IdempotencyRetry {
public readonly uid: string;
public readonly timesLeft: number;
public readonly maxTries: number;
private constructor(timesLeft: number, maxTimesLeft: number) {
this.timesLeft = timesLeft;
this.maxTries = maxTimesLeft;
this.uid = encodeCrock(getRandomBytes(32))
}
static tryFiveTimes() {
return new IdempotencyRetry(5, 5)
}
next(): IdempotencyRetry | undefined {
const left = this.timesLeft -1
if (left <= 0) {
return undefined
}
return new IdempotencyRetry(left, this.maxTries);
}
}
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