Split out InterActiveAuthDialog

Into a component that does Interactive Auth and a dialog that
wraps it, so we can do interactive auth not necessarily in a
dialog.

As a side effect:
 * Put the buttons for each auth stage in the stage itself.
   Some stages don't have submit buttons (and it's very possible
   other stages may have other buttons entirely, like 'resend')
   so it makes more sense for the buttons to live in the stage
   components themselves. Plus it saves the slightly evil
   calling-functions-on-react-children thing we were doing (and
   indeed extending that to show the submit button at all).
 * Give all BaseDialogs a cross in the top right to cancel. They
   were all dismissable by clicking outside or pressing esc, so
   this adds a more visually obvious way of dismissing them. Plus,
   it means our InteractiveAuthDialog can have a way of canceling
   the whole operation separate from buttons for the individual
   stages.

src/components/structures/InteractiveAuth.js

@@ -0,0 +1,153 @@
+/*
+Copyright 2017 Vector Creations Ltd.
+
+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 Matrix from 'matrix-js-sdk';
+const InteractiveAuth = Matrix.InteractiveAuth;
+
+import React from 'react';
+
+import sdk from '../../index';
+
+import {getEntryComponentForLoginType} from '../views/login/InteractiveAuthEntryComponents';
+
+export default React.createClass({
+    displayName: 'InteractiveAuth',
+
+    propTypes: {
+        // response from initial request. If not supplied, will do a request on
+        // mount.
+        authData: React.PropTypes.shape({
+            flows: React.PropTypes.array,
+            params: React.PropTypes.object,
+            session: React.PropTypes.string,
+        }),
+
+        // callback
+        makeRequest: React.PropTypes.func.isRequired,
+
+        onFinished: React.PropTypes.func.isRequired,
+    },
+
+    getInitialState: function() {
+        return {
+            authStage: null,
+            busy: false,
+            errorText: null,
+            stageErrorText: null,
+            submitButtonEnabled: false,
+        };
+    },
+
+    componentWillMount: function() {
+        this._unmounted = false;
+        this._authLogic = new InteractiveAuth({
+            authData: this.props.authData,
+            doRequest: this._requestCallback,
+            startAuthStage: this._startAuthStage,
+        });
+
+        this._authLogic.attemptAuth().then((result) => {
+            this.props.onFinished(true, result);
+        }).catch((error) => {
+            console.error("Error during user-interactive auth:", error);
+            if (this._unmounted) {
+                return;
+            }
+
+            const msg = error.message || error.toString();
+            this.setState({
+                errorText: msg
+            });
+        }).done();
+    },
+
+    componentWillUnmount: function() {
+        this._unmounted = true;
+    },
+
+    _startAuthStage: function(stageType, error) {
+        this.setState({
+            authStage: stageType,
+            errorText: error ? error.error : null,
+        }, this._setFocus);
+    },
+
+    _requestCallback: function(auth) {
+        this.setState({
+            busy: true,
+            errorText: null,
+            stageErrorText: null,
+        });
+        return this.props.makeRequest(auth).finally(() => {
+            if (this._unmounted) {
+                return;
+            }
+            this.setState({
+                busy: false,
+            });
+        });
+    },
+
+    _setFocus: function() {
+        if (this.refs.stageComponent && this.refs.stageComponent.focus) {
+            this.refs.stageComponent.focus();
+        }
+    },
+
+    _onCancel: function() {
+        this.props.onFinished(false);
+    },
+
+    _submitAuthDict: function(authData) {
+        this._authLogic.submitAuthDict(authData);
+    },
+
+    _renderCurrentStage: function() {
+        const stage = this.state.authStage;
+        var StageComponent = getEntryComponentForLoginType(stage);
+        return (
+            <StageComponent ref="stageComponent"
+                loginType={stage}
+                authSessionId={this._authLogic.getSessionId()}
+                stageParams={this._authLogic.getStageParams(stage)}
+                submitAuthDict={this._submitAuthDict}
+                errorText={this.state.stageErrorText}
+            />
+        );
+    },
+
+    render: function() {
+        const Loader = sdk.getComponent("elements.Spinner");
+
+        let error = null;
+        if (this.state.errorText) {
+            error = (
+                <div className="error">
+                    {this.state.errorText}
+                </div>
+            );
+        }
+
+        return (
+            <div>
+                <div>
+                    {this._renderCurrentStage()}
+                    {error}
+                </div>
+            </div>
+        );
+    },
+});