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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/>
*/
import { Logger } from "@gnu-taler/taler-util";
import { Fragment, h, VNode } from "preact";
import { StateUpdater } from "preact/hooks";
import { useBackendContext } from "../../context/backend.js";
import { PageStateType, usePageContext } from "../../context/pageState.js";
import {
InternationalizationAPI,
useTranslationContext,
} from "../../context/translation.js";
import { BackendState } from "../../hooks/backend.js";
import { prepareHeaders } from "../../utils.js";
const logger = new Logger("WithdrawalConfirmationQuestion");
/**
* Additional authentication required to complete the operation.
* Not providing a back button, only abort.
*/
export function WithdrawalConfirmationQuestion(): VNode {
const { pageState, pageStateSetter } = usePageContext();
const backend = useBackendContext();
const { i18n } = useTranslationContext();
const captchaNumbers = {
a: Math.floor(Math.random() * 10),
b: Math.floor(Math.random() * 10),
};
let captchaAnswer = "";
return (
<Fragment>
<h1 class="nav">{i18n.str`Confirm Withdrawal`}</h1>
<article>
<div class="challenge-div">
<form class="challenge-form" noValidate>
<div class="pure-form" id="captcha" name="capcha-form">
<h2>{i18n.str`Authorize withdrawal by solving challenge`}</h2>
<p>
<label for="answer">
{i18n.str`What is`}
<em>
{captchaNumbers.a} + {captchaNumbers.b}
</em>
?
</label>
<input
name="answer"
id="answer"
type="text"
autoFocus
required
onInput={(e): void => {
captchaAnswer = e.currentTarget.value;
}}
/>
</p>
<p>
<button
class="pure-button pure-button-primary btn-confirm"
onClick={(e) => {
e.preventDefault();
if (
captchaAnswer ==
(captchaNumbers.a + captchaNumbers.b).toString()
) {
confirmWithdrawalCall(
backend.state,
pageState.withdrawalId,
pageStateSetter,
i18n,
);
return;
}
pageStateSetter((prevState: PageStateType) => ({
...prevState,
error: {
title: i18n.str`Answer is wrong.`,
},
}));
}}
>
{i18n.str`Confirm`}
</button>
<button
class="pure-button pure-button-secondary btn-cancel"
onClick={async () =>
await abortWithdrawalCall(
backend.state,
pageState.withdrawalId,
pageStateSetter,
i18n,
)
}
>
{i18n.str`Cancel`}
</button>
</p>
</div>
</form>
<div class="hint">
<p>
<i18n.Translate>
A this point, a <b>real</b> bank would ask for an additional
authentication proof (PIN/TAN, one time password, ..), instead
of a simple calculation.
</i18n.Translate>
</p>
</div>
</div>
</article>
</Fragment>
);
}
/**
* This function confirms a withdrawal operation AFTER
* the wallet has given the exchange's payment details
* to the bank (via the Integration API). Such details
* can be given by scanning a QR code or by passing the
* raw taler://withdraw-URI to the CLI wallet.
*
* This function will set the confirmation status in the
* 'page state' and let the related components refresh.
*/
async function confirmWithdrawalCall(
backendState: BackendState,
withdrawalId: string | undefined,
pageStateSetter: StateUpdater<PageStateType>,
i18n: InternationalizationAPI,
): Promise<void> {
if (backendState.status === "loggedOut") {
logger.error("No credentials found.");
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`No credentials found.`,
},
}));
return;
}
if (typeof withdrawalId === "undefined") {
logger.error("No withdrawal ID found.");
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`No withdrawal ID found.`,
},
}));
return;
}
let res: Response;
try {
const { username, password } = backendState;
const headers = prepareHeaders(username, password);
/**
* NOTE: tests show that when a same object is being
* POSTed, caching might prevent same requests from being
* made. Hence, trying to POST twice the same amount might
* get silently ignored.
*
* headers.append("cache-control", "no-store");
* headers.append("cache-control", "no-cache");
* headers.append("pragma", "no-cache");
* */
// Backend URL must have been stored _with_ a final slash.
const url = new URL(
`access-api/accounts/${backendState.username}/withdrawals/${withdrawalId}/confirm`,
backendState.url,
);
res = await fetch(url.href, {
method: "POST",
headers,
});
} catch (error) {
logger.error("Could not POST withdrawal confirmation to the bank", error);
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`Could not confirm the withdrawal`,
description: (error as any).error.description,
debug: JSON.stringify(error),
},
}));
return;
}
if (!res || !res.ok) {
const response = await res.json();
// assume not ok if res is null
logger.error(
`Withdrawal confirmation gave response error (${res.status})`,
res.statusText,
);
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`Withdrawal confirmation gave response error`,
debug: JSON.stringify(response),
},
}));
return;
}
logger.trace("Withdrawal operation confirmed!");
pageStateSetter((prevState) => {
const { talerWithdrawUri, ...rest } = prevState;
return {
...rest,
info: i18n.str`Withdrawal confirmed!`,
};
});
}
/**
* Abort a withdrawal operation via the Access API's /abort.
*/
async function abortWithdrawalCall(
backendState: BackendState,
withdrawalId: string | undefined,
pageStateSetter: StateUpdater<PageStateType>,
i18n: InternationalizationAPI,
): Promise<void> {
if (backendState.status === "loggedOut") {
logger.error("No credentials found.");
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`No credentials found.`,
},
}));
return;
}
if (typeof withdrawalId === "undefined") {
logger.error("No withdrawal ID found.");
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`No withdrawal ID found.`,
},
}));
return;
}
let res: Response;
try {
const { username, password } = backendState;
const headers = prepareHeaders(username, password);
/**
* NOTE: tests show that when a same object is being
* POSTed, caching might prevent same requests from being
* made. Hence, trying to POST twice the same amount might
* get silently ignored. Needs more observation!
*
* headers.append("cache-control", "no-store");
* headers.append("cache-control", "no-cache");
* headers.append("pragma", "no-cache");
* */
// Backend URL must have been stored _with_ a final slash.
const url = new URL(
`access-api/accounts/${backendState.username}/withdrawals/${withdrawalId}/abort`,
backendState.url,
);
res = await fetch(url.href, { method: "POST", headers });
} catch (error) {
logger.error("Could not abort the withdrawal", error);
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`Could not abort the withdrawal.`,
description: (error as any).error.description,
debug: JSON.stringify(error),
},
}));
return;
}
if (!res.ok) {
const response = await res.json();
logger.error(
`Withdrawal abort gave response error (${res.status})`,
res.statusText,
);
pageStateSetter((prevState) => ({
...prevState,
error: {
title: i18n.str`Withdrawal abortion failed.`,
description: response.error.description,
debug: JSON.stringify(response),
},
}));
return;
}
logger.trace("Withdrawal operation aborted!");
pageStateSetter((prevState) => {
const { ...rest } = prevState;
return {
...rest,
info: i18n.str`Withdrawal aborted!`,
};
});
}
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