Have ServerConfig and co. do validation of the config in-house

This also causes the components to produce a ValidatedServerConfig for use by other components.

res/css/views/auth/_ServerConfig.scss

@@ -35,3 +35,8 @@ limitations under the License.
 .mx_ServerConfig_help:link {
     opacity: 0.8;
 }
+
+.mx_ServerConfig_error {
+    display: block;
+    color: $warning-color;
+}

src/components/views/auth/ModularServerConfig.js

@@ -18,9 +18,15 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import sdk from '../../../index';
 import { _t } from '../../../languageHandler';
+import {ValidatedServerConfig} from "../../../utils/AutoDiscoveryUtils";
+import SdkConfig from "../../../SdkConfig";
+import AutoDiscoveryUtils from "../../../utils/AutoDiscoveryUtils";
+import * as ServerType from '../../views/auth/ServerTypeSelector';
 
 const MODULAR_URL = 'https://modular.im/?utm_source=riot-web&utm_medium=web&utm_campaign=riot-web-authentication';
 
+// TODO: TravisR - Can this extend ServerConfig for most things?
+
 /*
  * Configure the Modular server name.
  *
@@ -31,65 +37,87 @@ export default class ModularServerConfig extends React.PureComponent {
     static propTypes = {
         onServerConfigChange: PropTypes.func,
 
-        // default URLs are defined in config.json (or the hardcoded defaults)
-        // they are used if the user has not overridden them with a custom URL.
-        // In other words, if the custom URL is blank, the default is used.
-        defaultHsUrl: PropTypes.string, // e.g. https://matrix.org
-
-        // This component always uses the default IS URL and doesn't allow it
-        // to be changed.  We still receive it as a prop here to simplify
-        // consumers by still passing the IS URL via onServerConfigChange.
-        defaultIsUrl: PropTypes.string, // e.g. https://vector.im
-
-        // custom URLs are explicitly provided by the user and override the
-        // default URLs.  The user enters them via the component's input fields,
-        // which is reflected on these properties whenever on..UrlChanged fires.
-        // They are persisted in localStorage by MatrixClientPeg, and so can
-        // override the default URLs when the component initially loads.
-        customHsUrl: PropTypes.string,
+        // The current configuration that the user is expecting to change.
+        serverConfig: PropTypes.instanceOf(ValidatedServerConfig).isRequired,
 
         delayTimeMs: PropTypes.number, // time to wait before invoking onChanged
-    }
+    };
 
     static defaultProps = {
         onServerConfigChange: function() {},
         customHsUrl: "",
         delayTimeMs: 0,
-    }
+    };
 
     constructor(props) {
         super(props);
 
         this.state = {
-            hsUrl: props.customHsUrl,
+            busy: false,
+            errorText: "",
+            hsUrl: props.serverConfig.hsUrl,
+            isUrl: props.serverConfig.isUrl,
         };
     }
 
     componentWillReceiveProps(newProps) {
-        if (newProps.customHsUrl === this.state.hsUrl) return;
+        if (newProps.serverConfig.hsUrl === this.state.hsUrl &&
+            newProps.serverConfig.isUrl === this.state.isUrl) return;
+
+        this.validateAndApplyServer(newProps.serverConfig.hsUrl, newProps.serverConfig.isUrl);
+    }
+
+    async validateAndApplyServer(hsUrl, isUrl) {
+        // Always try and use the defaults first
+        const defaultConfig: ValidatedServerConfig = SdkConfig.get()["validated_server_config"];
+        if (defaultConfig.hsUrl === hsUrl && defaultConfig.isUrl === isUrl) {
+            this.setState({busy: false, errorText: ""});
+            this.props.onServerConfigChange(defaultConfig);
+            return defaultConfig;
+        }
 
         this.setState({
-            hsUrl: newProps.customHsUrl,
+            hsUrl,
+            isUrl,
+            busy: true,
+            errorText: "",
         });
-        this.props.onServerConfigChange({
-            hsUrl: newProps.customHsUrl,
-            isUrl: this.props.defaultIsUrl,
+
+        try {
+            const result = await AutoDiscoveryUtils.validateServerConfigWithStaticUrls(hsUrl, isUrl);
+            this.setState({busy: false, errorText: ""});
+            this.props.onServerConfigChange(result);
+            return result;
+        } catch (e) {
+            console.error(e);
+            let message = _t("Unable to validate homeserver/identity server");
+            if (e.translatedMessage) {
+                message = e.translatedMessage;
+            }
+            this.setState({
+                busy: false,
+                errorText: message,
             });
         }
+    }
+
+    async validateServer() {
+        // TODO: Do we want to support .well-known lookups here?
+        // If for some reason someone enters "matrix.org" for a URL, we could do a lookup to
+        // find their homeserver without demanding they use "https://matrix.org"
+        return this.validateAndApplyServer(this.state.hsUrl, ServerType.TYPES.PREMIUM.identityServerUrl);
+    }
 
     onHomeserverBlur = (ev) => {
         this._hsTimeoutId = this._waitThenInvoke(this._hsTimeoutId, () => {
-            this.props.onServerConfigChange({
-                hsUrl: this.state.hsUrl,
-                isUrl: this.props.defaultIsUrl,
+            this.validateServer();
         });
-        });
-    }
+    };
 
     onHomeserverChange = (ev) => {
         const hsUrl = ev.target.value;
         this.setState({ hsUrl });
-    }
+    };
 
     _waitThenInvoke(existingTimeoutId, fn) {
         if (existingTimeoutId) {
@@ -116,7 +144,7 @@ export default class ModularServerConfig extends React.PureComponent {
                 <div className="mx_ServerConfig_fields">
                     <Field id="mx_ServerConfig_hsUrl"
                         label={_t("Server Name")}
-                        placeholder={this.props.defaultHsUrl}
+                        placeholder={this.props.serverConfig.hsUrl}
                         value={this.state.hsUrl}
                         onBlur={this.onHomeserverBlur}
                         onChange={this.onHomeserverChange}

src/components/views/auth/ServerConfig.js

@@ -20,6 +20,9 @@ import PropTypes from 'prop-types';
 import Modal from '../../../Modal';
 import sdk from '../../../index';
 import { _t } from '../../../languageHandler';
+import {ValidatedServerConfig} from "../../../utils/AutoDiscoveryUtils";
+import AutoDiscoveryUtils from "../../../utils/AutoDiscoveryUtils";
+import SdkConfig from "../../../SdkConfig";
 
 /*
  * A pure UI component which displays the HS and IS to use.
@@ -29,80 +32,97 @@ export default class ServerConfig extends React.PureComponent {
     static propTypes = {
         onServerConfigChange: PropTypes.func,
 
-        // default URLs are defined in config.json (or the hardcoded defaults)
-        // they are used if the user has not overridden them with a custom URL.
-        // In other words, if the custom URL is blank, the default is used.
-        defaultHsUrl: PropTypes.string, // e.g. https://matrix.org
-        defaultIsUrl: PropTypes.string, // e.g. https://vector.im
-
-        // custom URLs are explicitly provided by the user and override the
-        // default URLs.  The user enters them via the component's input fields,
-        // which is reflected on these properties whenever on..UrlChanged fires.
-        // They are persisted in localStorage by MatrixClientPeg, and so can
-        // override the default URLs when the component initially loads.
-        customHsUrl: PropTypes.string,
-        customIsUrl: PropTypes.string,
+        // The current configuration that the user is expecting to change.
+        serverConfig: PropTypes.instanceOf(ValidatedServerConfig).isRequired,
 
         delayTimeMs: PropTypes.number, // time to wait before invoking onChanged
-    }
+    };
 
     static defaultProps = {
         onServerConfigChange: function() {},
-        customHsUrl: "",
-        customIsUrl: "",
         delayTimeMs: 0,
-    }
+    };
 
     constructor(props) {
         super(props);
 
         this.state = {
-            hsUrl: props.customHsUrl,
-            isUrl: props.customIsUrl,
+            busy: false,
+            errorText: "",
+            hsUrl: props.serverConfig.hsUrl,
+            isUrl: props.serverConfig.isUrl,
         };
     }
 
     componentWillReceiveProps(newProps) {
-        if (newProps.customHsUrl === this.state.hsUrl &&
-            newProps.customIsUrl === this.state.isUrl) return;
+        if (newProps.serverConfig.hsUrl === this.state.hsUrl &&
+            newProps.serverConfig.isUrl === this.state.isUrl) return;
+
+        this.validateAndApplyServer(newProps.serverConfig.hsUrl, newProps.serverConfig.isUrl);
+    }
+
+    async validateServer() {
+        // TODO: Do we want to support .well-known lookups here?
+        // If for some reason someone enters "matrix.org" for a URL, we could do a lookup to
+        // find their homeserver without demanding they use "https://matrix.org"
+        return this.validateAndApplyServer(this.state.hsUrl, this.state.isUrl);
+    }
+
+    async validateAndApplyServer(hsUrl, isUrl) {
+        // Always try and use the defaults first
+        const defaultConfig: ValidatedServerConfig = SdkConfig.get()["validated_server_config"];
+        if (defaultConfig.hsUrl === hsUrl && defaultConfig.isUrl === isUrl) {
+            this.setState({busy: false, errorText: ""});
+            this.props.onServerConfigChange(defaultConfig);
+            return defaultConfig;
+        }
 
         this.setState({
-            hsUrl: newProps.customHsUrl,
-            isUrl: newProps.customIsUrl,
+            hsUrl,
+            isUrl,
+            busy: true,
+            errorText: "",
         });
-        this.props.onServerConfigChange({
-            hsUrl: newProps.customHsUrl,
-            isUrl: newProps.customIsUrl,
+
+        try {
+            const result = await AutoDiscoveryUtils.validateServerConfigWithStaticUrls(hsUrl, isUrl);
+            this.setState({busy: false, errorText: ""});
+            this.props.onServerConfigChange(result);
+            return result;
+        } catch (e) {
+            console.error(e);
+            let message = _t("Unable to validate homeserver/identity server");
+            if (e.translatedMessage) {
+                message = e.translatedMessage;
+            }
+            this.setState({
+                busy: false,
+                errorText: message,
             });
         }
+    }
 
     onHomeserverBlur = (ev) => {
         this._hsTimeoutId = this._waitThenInvoke(this._hsTimeoutId, () => {
-            this.props.onServerConfigChange({
-                hsUrl: this.state.hsUrl,
-                isUrl: this.state.isUrl,
+            this.validateServer();
         });
-        });
-    }
+    };
 
     onHomeserverChange = (ev) => {
         const hsUrl = ev.target.value;
         this.setState({ hsUrl });
-    }
+    };
 
     onIdentityServerBlur = (ev) => {
         this._isTimeoutId = this._waitThenInvoke(this._isTimeoutId, () => {
-            this.props.onServerConfigChange({
-                hsUrl: this.state.hsUrl,
-                isUrl: this.state.isUrl,
+            this.validateServer();
         });
-        });
-    }
+    };
 
     onIdentityServerChange = (ev) => {
         const isUrl = ev.target.value;
         this.setState({ isUrl });
-    }
+    };
 
     _waitThenInvoke(existingTimeoutId, fn) {
         if (existingTimeoutId) {
@@ -114,11 +134,15 @@ export default class ServerConfig extends React.PureComponent {
     showHelpPopup = () => {
         const CustomServerDialog = sdk.getComponent('auth.CustomServerDialog');
         Modal.createTrackedDialog('Custom Server Dialog', '', CustomServerDialog);
-    }
+    };
 
     render() {
         const Field = sdk.getComponent('elements.Field');
 
+        const errorText = this.state.errorText
+            ? <span className='mx_ServerConfig_error'>{this.state.errorText}</span>
+            : null;
+
         return (
             <div className="mx_ServerConfig">
                 <h3>{_t("Other servers")}</h3>
@@ -127,20 +151,23 @@ export default class ServerConfig extends React.PureComponent {
                         { sub }
                     </a>,
                 })}
+                {errorText}
                 <div className="mx_ServerConfig_fields">
                     <Field id="mx_ServerConfig_hsUrl"
                         label={_t("Homeserver URL")}
-                        placeholder={this.props.defaultHsUrl}
+                        placeholder={this.props.serverConfig.hsUrl}
                         value={this.state.hsUrl}
                         onBlur={this.onHomeserverBlur}
                         onChange={this.onHomeserverChange}
+                        disabled={this.state.busy}
                     />
                     <Field id="mx_ServerConfig_isUrl"
                         label={_t("Identity Server URL")}
-                        placeholder={this.props.defaultIsUrl}
+                        placeholder={this.props.serverConfig.isUrl}
                         value={this.state.isUrl}
                         onBlur={this.onIdentityServerBlur}
                         onChange={this.onIdentityServerChange}
+                        disabled={this.state.busy}
                     />
                 </div>
             </div>

src/utils/AutoDiscoveryUtils.js

@@ -0,0 +1,104 @@
+/*
+Copyright 2019 New Vector 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 {AutoDiscovery} from "matrix-js-sdk";
+import {_td, newTranslatableError} from "../languageHandler";
+import {makeType} from "./TypeUtils";
+import SdkConfig from "../SdkConfig";
+
+export class ValidatedServerConfig {
+    hsUrl: string;
+    hsName: string;
+    hsNameIsDifferent: string;
+
+    isUrl: string;
+    identityEnabled: boolean;
+}
+
+export default class AutoDiscoveryUtils {
+    static async validateServerConfigWithStaticUrls(homeserverUrl: string, identityUrl: string): ValidatedServerConfig {
+        if (!homeserverUrl) {
+            throw newTranslatableError(_td("No homeserver URL provided"));
+        }
+
+        const wellknownConfig = {
+            "m.homeserver": {
+                base_url: homeserverUrl,
+            },
+            "m.identity_server": {
+                base_url: identityUrl,
+            },
+        };
+
+        const result = await AutoDiscovery.fromDiscoveryConfig(wellknownConfig);
+
+        const url = new URL(homeserverUrl);
+        const serverName = url.hostname;
+
+        return AutoDiscoveryUtils.buildValidatedConfigFromDiscovery(serverName, result);
+    }
+
+    static async validateServerName(serverName: string): ValidatedServerConfig {
+        const result = await AutoDiscovery.findClientConfig(serverName);
+        return AutoDiscoveryUtils.buildValidatedConfigFromDiscovery(serverName, result);
+    }
+
+    static buildValidatedConfigFromDiscovery(serverName: string, discoveryResult): ValidatedServerConfig {
+        if (!discoveryResult || !discoveryResult["m.homeserver"]) {
+            // This shouldn't happen without major misconfiguration, so we'll log a bit of information
+            // in the log so we can find this bit of codee but otherwise tell teh user "it broke".
+            console.error("Ended up in a state of not knowing which homeserver to connect to.");
+            throw newTranslatableError(_td("Unexpected error resolving homeserver configuration"));
+        }
+
+        const hsResult = discoveryResult['m.homeserver'];
+        if (hsResult.state !== AutoDiscovery.SUCCESS) {
+            if (AutoDiscovery.ALL_ERRORS.indexOf(hsResult.error) !== -1) {
+                throw newTranslatableError(hsResult.error);
+            }
+            throw newTranslatableError(_td("Unexpected error resolving homeserver configuration"));
+        }
+
+        const isResult = discoveryResult['m.identity_server'];
+        let preferredIdentityUrl = "https://vector.im";
+        if (isResult && isResult.state === AutoDiscovery.SUCCESS) {
+            preferredIdentityUrl = isResult["base_url"];
+        } else if (isResult && isResult.state !== AutoDiscovery.PROMPT) {
+            console.error("Error determining preferred identity server URL:", isResult);
+            throw newTranslatableError(_td("Unexpected error resolving homeserver configuration"));
+        }
+
+        const preferredHomeserverUrl = hsResult["base_url"];
+        let preferredHomeserverName = serverName ? serverName : hsResult["server_name"];
+
+        const url = new URL(preferredHomeserverUrl);
+        if (!preferredHomeserverName) preferredHomeserverName = url.hostname;
+
+        // It should have been set by now, so check it
+        if (!preferredHomeserverName) {
+            console.error("Failed to parse homeserver name from homeserver URL");
+            throw newTranslatableError(_td("Unexpected error resolving homeserver configuration"));
+        }
+
+        return makeType(ValidatedServerConfig, {
+            hsUrl: preferredHomeserverUrl,
+            hsName: preferredHomeserverName,
+            hsNameIsDifferent: url.hostname !== preferredHomeserverName,
+            isUrl: preferredIdentityUrl,
+            identityEnabled: !SdkConfig.get()['disable_identity_server'],
+        });
+    }
+}