add toast for verification requests

this uses a verification requests as emitted by the js-sdk with
the `crypto.verification.request` rather than a verifier as emitted
by `crypto.verification.start` as this works for both to_device and
timeline events with the changes made in the js-sdk pr.

src/components/views/toasts/VerificationRequestToast.js

@@ -0,0 +1,123 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import PropTypes from 'prop-types';
+import sdk from "../../../index";
+import { _t } from '../../../languageHandler';
+import Modal from "../../../Modal";
+import MatrixClientPeg from '../../../MatrixClientPeg';
+import {verificationMethods} from 'matrix-js-sdk/lib/crypto';
+import KeyVerificationStateObserver, {userLabelForEventRoom} from "../../../utils/KeyVerificationStateObserver";
+import dis from "../../../dispatcher";
+
+export default class VerificationRequestToast extends React.PureComponent {
+    constructor(props) {
+        super(props);
+        const {event, timeout} = props.request;
+        // to_device requests don't have a timestamp, so consider them age=0
+        const age = event.getTs() ? event.getLocalAge() : 0;
+        const remaining = Math.max(0, timeout - age);
+        const counter = Math.ceil(remaining / 1000);
+        this.state = {counter};
+        if (this.props.requestObserver) {
+            this.props.requestObserver.setCallback(this._checkRequestIsPending);
+        }
+    }
+
+    componentDidMount() {
+        if (this.props.requestObserver) {
+            this.props.requestObserver.attach();
+            this._checkRequestIsPending();
+        }
+        this._intervalHandle = setInterval(() => {
+            let {counter} = this.state;
+            counter -= 1;
+            if (counter <= 0) {
+                this.cancel();
+            } else {
+                this.setState({counter});
+            }
+        }, 1000);
+    }
+
+    componentWillUnmount() {
+        clearInterval(this._intervalHandle);
+        if (this.props.requestObserver) {
+            this.props.requestObserver.detach();
+        }
+    }
+
+    _checkRequestIsPending = () => {
+        if (!this.props.requestObserver.pending) {
+            this.props.dismiss();
+        }
+    }
+
+    cancel = () => {
+        this.props.dismiss();
+        try {
+            this.props.request.cancel();
+        } catch (err) {
+            console.error("Error while cancelling verification request", err);
+        }
+    }
+
+    accept = () => {
+        this.props.dismiss();
+        const {event} = this.props.request;
+        // no room id for to_device requests
+        if (event.getRoomId()) {
+            dis.dispatch({
+                action: 'view_room',
+                room_id: event.getRoomId(),
+                should_peek: false,
+            });
+        }
+
+        const verifier = this.props.request.beginKeyVerification(verificationMethods.SAS);
+        const IncomingSasDialog = sdk.getComponent('views.dialogs.IncomingSasDialog');
+        Modal.createTrackedDialog('Incoming Verification', '', IncomingSasDialog, {verifier});
+    };
+
+    render() {
+        const FormButton = sdk.getComponent("elements.FormButton");
+        const {event} = this.props.request;
+        const userId = event.getSender();
+        let nameLabel = event.getRoomId() ? userLabelForEventRoom(userId, event) : userId;
+        // for legacy to_device verification requests
+        if (nameLabel === userId) {
+            const client = MatrixClientPeg.get();
+            const user = client.getUser(event.getSender());
+            if (user && user.displayName) {
+                nameLabel = _t("%(name)s (%(userId)s)", {name: user.displayName, userId});
+            }
+        }
+        return (<div>
+            <div className="mx_Toast_description">{nameLabel}</div>
+            <div className="mx_Toast_buttons">
+                <FormButton label={_t("Decline (%(counter)s)", {counter: this.state.counter})} kind="danger" onClick={this.cancel} />
+                <FormButton label={_t("Accept")} onClick={this.accept} />
+            </div>
+        </div>);
+    }
+}
+
+VerificationRequestToast.propTypes = {
+    dismiss: PropTypes.func.isRequired,
+    request: PropTypes.object.isRequired,
+    requestObserver: PropTypes.instanceOf(KeyVerificationStateObserver),
+};