ThreadNet-Web/src/components/views/settings/devices/LoginWithQRSection.tsx

/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

import React from "react";
import {
    IGetLoginTokenCapability,
    IServerVersions,
    GET_LOGIN_TOKEN_CAPABILITY,
    Capabilities,
    IClientWellKnown,
    OidcClientConfig,
    MatrixClient,
    DEVICE_CODE_SCOPE,
} from "matrix-js-sdk/src/matrix";
import QrCodeIcon from "@vector-im/compound-design-tokens/assets/web/icons/qr-code";

import { _t } from "../../../../languageHandler";
import AccessibleButton from "../../elements/AccessibleButton";
import SettingsSubsection from "../shared/SettingsSubsection";
import SettingsStore from "../../../../settings/SettingsStore";
import { Features } from "../../../../settings/Settings";
import { useMatrixClientContext } from "../../../../contexts/MatrixClientContext";

interface IProps {
    onShowQr: () => void;
    versions?: IServerVersions;
    capabilities?: Capabilities;
    wellKnown?: IClientWellKnown;
    oidcClientConfig?: OidcClientConfig;
    isCrossSigningReady?: boolean;
}

function shouldShowQrLegacy(
    versions?: IServerVersions,
    wellKnown?: IClientWellKnown,
    capabilities?: Capabilities,
): boolean {
    // Needs server support for (get_login_token or OIDC Device Authorization Grant) and MSC3886:
    // in r0 of MSC3882 it is exposed as a feature flag, but in stable and unstable r1 it is a capability
    const loginTokenCapability = GET_LOGIN_TOKEN_CAPABILITY.findIn<IGetLoginTokenCapability>(capabilities);
    const getLoginTokenSupported =
        !!versions?.unstable_features?.["org.matrix.msc3882"] || !!loginTokenCapability?.enabled;
    const msc3886Supported =
        !!versions?.unstable_features?.["org.matrix.msc3886"] || !!wellKnown?.["io.element.rendezvous"]?.server;
    return getLoginTokenSupported && msc3886Supported;
}

export function shouldShowQr(
    cli: MatrixClient,
    isCrossSigningReady: boolean,
    oidcClientConfig?: OidcClientConfig,
    versions?: IServerVersions,
    wellKnown?: IClientWellKnown,
): boolean {
    const msc4108Supported =
        !!versions?.unstable_features?.["org.matrix.msc4108"] || !!wellKnown?.["io.element.rendezvous"]?.server;

    const deviceAuthorizationGrantSupported =
        oidcClientConfig?.metadata?.grant_types_supported.includes(DEVICE_CODE_SCOPE);

    return (
        deviceAuthorizationGrantSupported &&
        msc4108Supported &&
        SettingsStore.getValue(Features.OidcNativeFlow) &&
        !!cli.getCrypto()?.exportSecretsBundle &&
        isCrossSigningReady
    );
}

const LoginWithQRSection: React.FC<IProps> = ({
    onShowQr,
    versions,
    capabilities,
    wellKnown,
    oidcClientConfig,
    isCrossSigningReady,
}) => {
    const cli = useMatrixClientContext();
    const offerShowQr = oidcClientConfig
        ? shouldShowQr(cli, !!isCrossSigningReady, oidcClientConfig, versions, wellKnown)
        : shouldShowQrLegacy(versions, wellKnown, capabilities);

    // don't show anything if no method is available
    if (!offerShowQr) {
        return null;
    }

    return (
        <SettingsSubsection heading={_t("settings|sessions|sign_in_with_qr")}>
            <div className="mx_LoginWithQRSection">
                <p className="mx_SettingsTab_subsectionText">{_t("settings|sessions|sign_in_with_qr_description")}</p>
                <AccessibleButton onClick={onShowQr} kind="primary">
                    <QrCodeIcon height={20} width={20} />
                    {_t("settings|sessions|sign_in_with_qr_button")}
                </AccessibleButton>
            </div>
        </SettingsSubsection>
    );
};

export default LoginWithQRSection;