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/*
This file is part of GNU Taler
(C) 2022 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/>
*/
/**
* Client for the Taler (demo-)bank.
*/
/**
* Imports.
*/
import {
AmountString,
base64FromArrayBuffer,
buildCodecForObject,
Codec,
codecForAny,
codecForString,
encodeCrock,
getRandomBytes,
j2s,
Logger,
stringToBytes,
TalerError,
TalerErrorCode,
} from "@gnu-taler/taler-util";
import {
checkSuccessResponseOrThrow,
createPlatformHttpLib,
HttpRequestLibrary,
readSuccessResponseJsonOrThrow,
} from "@gnu-taler/taler-util/http";
const logger = new Logger("bank-api-client.ts");
export enum CreditDebitIndicator {
Credit = "credit",
Debit = "debit",
}
export interface BankAccountBalanceResponse {
balance: {
amount: AmountString;
credit_debit_indicator: CreditDebitIndicator;
};
}
export interface BankServiceHandle {
readonly bankAccessApiBaseUrl: string;
readonly http: HttpRequestLibrary;
}
export interface BankUser {
username: string;
password: string;
accountPaytoUri: string;
}
export interface WithdrawalOperationInfo {
withdrawal_id: string;
taler_withdraw_uri: string;
}
/**
* FIXME: Rename, this is not part of the integration test harness anymore.
*/
export interface HarnessExchangeBankAccount {
accountName: string;
accountPassword: string;
accountPaytoUri: string;
wireGatewayApiBaseUrl: string;
}
/**
* Helper function to generate the "Authorization" HTTP header.
*/
function makeBasicAuthHeader(username: string, password: string): string {
const auth = `${username}:${password}`;
const authEncoded: string = base64FromArrayBuffer(stringToBytes(auth));
return `Basic ${authEncoded}`;
}
const codecForWithdrawalOperationInfo = (): Codec<WithdrawalOperationInfo> =>
buildCodecForObject<WithdrawalOperationInfo>()
.property("withdrawal_id", codecForString())
.property("taler_withdraw_uri", codecForString())
.build("WithdrawalOperationInfo");
/**
* @deprecated Use BankAccessApiClient or WireGatewayApi
*/
export namespace BankApi {
// FIXME: Move to BankAccessApi?!
export async function registerAccount(
bank: BankServiceHandle,
username: string,
password: string,
): Promise<BankUser> {
const url = new URL("testing/register", bank.bankAccessApiBaseUrl);
const resp = await bank.http.postJson(url.href, { username, password });
let paytoUri = `payto://x-taler-bank/localhost/${username}`;
if (resp.status !== 200 && resp.status !== 202 && resp.status !== 204) {
logger.error(`${j2s(await resp.json())}`);
throw TalerError.fromDetail(
TalerErrorCode.GENERIC_UNEXPECTED_REQUEST_ERROR,
{
httpStatusCode: resp.status,
},
);
}
try {
// Pybank has no body, thus this might throw.
const respJson = await resp.json();
// LibEuFin demobank returns payto URI in response
if (respJson.paytoUri) {
paytoUri = respJson.paytoUri;
}
} catch (e) {
// Do nothing
}
return {
password,
username,
accountPaytoUri: paytoUri,
};
}
// FIXME: Move to BankAccessApi?!
export async function createRandomBankUser(
bank: BankServiceHandle,
): Promise<BankUser> {
const username = "user-" + encodeCrock(getRandomBytes(10)).toLowerCase();
const password = "pw-" + encodeCrock(getRandomBytes(10)).toLowerCase();
return await registerAccount(bank, username, password);
}
export async function confirmWithdrawalOperation(
bank: BankServiceHandle,
bankUser: BankUser,
wopi: WithdrawalOperationInfo,
): Promise<void> {
const url = new URL(
`accounts/${bankUser.username}/withdrawals/${wopi.withdrawal_id}/confirm`,
bank.bankAccessApiBaseUrl,
);
logger.info(`confirming withdrawal operation via ${url.href}`);
const resp = await bank.http.postJson(
url.href,
{},
{
headers: {
Authorization: makeBasicAuthHeader(
bankUser.username,
bankUser.password,
),
},
},
);
logger.info(`response status ${resp.status}`);
const respJson = await readSuccessResponseJsonOrThrow(resp, codecForAny());
// FIXME: We don't check the status here!
}
export async function abortWithdrawalOperation(
bank: BankServiceHandle,
bankUser: BankUser,
wopi: WithdrawalOperationInfo,
): Promise<void> {
const url = new URL(
`accounts/${bankUser.username}/withdrawals/${wopi.withdrawal_id}/abort`,
bank.bankAccessApiBaseUrl,
);
const resp = await bank.http.postJson(
url.href,
{},
{
headers: {
Authorization: makeBasicAuthHeader(
bankUser.username,
bankUser.password,
),
},
},
);
await readSuccessResponseJsonOrThrow(resp, codecForAny());
}
}
/**
* @deprecated use BankAccessApiClient
*/
export namespace BankAccessApi {
export async function getAccountBalance(
bank: BankServiceHandle,
bankUser: BankUser,
): Promise<BankAccountBalanceResponse> {
const url = new URL(
`accounts/${bankUser.username}`,
bank.bankAccessApiBaseUrl,
);
const resp = await bank.http.get(url.href, {
headers: {
Authorization: makeBasicAuthHeader(
bankUser.username,
bankUser.password,
),
},
});
return await resp.json();
}
export async function createWithdrawalOperation(
bank: BankServiceHandle,
bankUser: BankUser,
amount: string,
): Promise<WithdrawalOperationInfo> {
const url = new URL(
`accounts/${bankUser.username}/withdrawals`,
bank.bankAccessApiBaseUrl,
);
const resp = await bank.http.postJson(
url.href,
{
amount,
},
{
headers: {
Authorization: makeBasicAuthHeader(
bankUser.username,
bankUser.password,
),
},
},
);
return readSuccessResponseJsonOrThrow(
resp,
codecForWithdrawalOperationInfo(),
);
}
}
export interface BankAccessApiClientArgs {
baseUrl: string;
username: string;
password: string;
}
export interface BankAccessApiCreateTransactionRequest {
amount: AmountString;
paytoUri: string;
}
export class WireGatewayApiClientArgs {
accountName: string;
accountPassword: string;
wireGatewayApiBaseUrl: string;
}
export class WireGatewayApiClient {
httpLib = createPlatformHttpLib();
constructor(private args: WireGatewayApiClientArgs) {}
async adminAddIncoming(params: {
amount: string;
reservePub: string;
debitAccountPayto: string;
}): Promise<void> {
let url = new URL(
`admin/add-incoming`,
this.args.wireGatewayApiBaseUrl,
);
const resp = await this.httpLib.fetch(url.href, {
method: "POST",
body: {
amount: params.amount,
reserve_pub: params.reservePub,
debit_account: params.debitAccountPayto,
},
headers: {
Authorization: makeBasicAuthHeader(
this.args.accountName,
this.args.accountPassword,
),
},
});
logger.info(`add-incoming response status: ${resp.status}`);
await checkSuccessResponseOrThrow(resp);
}
}
export class BankAccessApiClient {
httpLib = createPlatformHttpLib();
constructor(private args: BankAccessApiClientArgs) {}
async getTransactions(): Promise<void> {
const reqUrl = new URL(
`accounts/${this.args.username}/transactions`,
this.args.baseUrl,
);
const authHeaderValue = makeBasicAuthHeader(
this.args.username,
this.args.password,
);
const resp = await this.httpLib.fetch(reqUrl.href, {
method: "GET",
headers: {
Authorization: authHeaderValue,
},
});
const res = await readSuccessResponseJsonOrThrow(resp, codecForAny());
logger.info(`result: ${j2s(res)}`);
}
async createTransaction(
req: BankAccessApiCreateTransactionRequest,
): Promise<any> {
const reqUrl = new URL(
`accounts/${this.args.username}/transactions`,
this.args.baseUrl,
);
const authHeaderValue = makeBasicAuthHeader(
this.args.username,
this.args.password,
);
const resp = await this.httpLib.fetch(reqUrl.href, {
method: "POST",
body: req,
headers: {
Authorization: authHeaderValue,
},
});
return await readSuccessResponseJsonOrThrow(resp, codecForAny());
}
}
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