Do full registration if HS doesn't support ILAG

ILAG only works on HSes that allow registering without an email
address, so whenever we redirect to the ILAG flow, check what
registration flows the server supports, and if it doesn't offer one
that's ILAG-compatible, prompt the user to go through the full
registration process instead.

This doesn't change all the entry points into ILAG, I'll do that
in a separate commit.

src/Registration.js

@@ -0,0 +1,96 @@
+/*
+Copyright 2018 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.
+*/
+
+/**
+ * Utility code for registering with a homeserver
+ * Note that this is currently *not* used by the actual
+ * registration code.
+ */
+
+import dis from './dispatcher';
+import sdk from './index';
+import MatrixClientPeg from './MatrixClientPeg';
+import Modal from './Modal';
+import { _t } from './languageHandler';
+
+/**
+ * Starts either the ILAG or full registration flow, depending
+ * on what the HS supports
+ */
+export async function startAnyRegistrationFlow(options) {
+    if (options === undefined) options = {};
+    const flows = await _getRegistrationFlows();
+    // look for an ILAG compatible flow. We define this as one
+    // which has only dummy or recaptcha flows. In practice it
+    // would support any stage InteractiveAuth supports, just not
+    // ones like email & msisdn which require the user to supply
+    // the relevant details in advance. We err on the side of
+    // caution though.
+    let hasIlagFlow = false;
+    for (const flow of flows) {
+        let flowSuitable = true;
+        for (const stage of flow.stages) {
+            if (!['m.login.dummy', 'm.login.recaptcha'].includes(stage)) {
+                flowSuitable = false;
+                break;
+            }
+        }
+        if (flowSuitable) {
+            hasIlagFlow = true;
+            break;
+        }
+    }
+    if (hasIlagFlow) {
+        dis.dispatch({
+            action: 'view_set_mxid',
+            go_home_on_cancel: options.go_home_on_cancel,
+        });
+    } else {
+        const QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");
+        Modal.createTrackedDialog('Registration required', '', QuestionDialog, {
+            title: _t("Registration Required"),
+            description: _t("You need to register to do this. Would you like to register now?"),
+            button: _t("Register"),
+            onFinished: (proceed) => {
+                if (proceed) {
+                    dis.dispatch({action: 'start_registration'});
+                } else if (options.go_home_on_cancel) {
+                    dis.dispatch({action: 'view_home_page'});
+                }
+            }
+        });
+    }
+}
+
+async function _getRegistrationFlows() {
+    try {
+        await MatrixClientPeg.get().register(
+            null,
+            null,
+            undefined,
+            {},
+            {},
+        );
+        console.log("Register request succeeded when it should have returned 401!");
+    } catch (e) {
+        if (e.httpStatus === 401) {
+            return e.data.flows;
+        }
+        throw e;
+    }
+    throw new Error("Register request succeeded when it should have returned 401!");
+}
+

src/components/structures/MatrixChat.js

@@ -45,6 +45,7 @@ import createRoom from "../../createRoom";
 import KeyRequestHandler from '../../KeyRequestHandler';
 import { _t, getCurrentLanguage } from '../../languageHandler';
 import SettingsStore, {SettingLevel} from "../../settings/SettingsStore";
+import { startAnyRegistrationFlow } from "../../Registration.js";
 
 /** constants for MatrixChat.state.view */
 const VIEWS = {
@@ -471,7 +472,7 @@ export default React.createClass({
                 action: 'do_after_sync_prepared',
                 deferred_action: payload,
             });
-            dis.dispatch({action: 'view_set_mxid'});
+            dis.dispatch({action: 'require_registration'});
             return;
         }
 
@@ -479,7 +480,11 @@ export default React.createClass({
             case 'logout':
                 Lifecycle.logout();
                 break;
+            case 'require_registration':
+                startAnyRegistrationFlow(payload);
+                break;
             case 'start_registration':
+                // This starts the full registration flow
                 this._startRegistration(payload.params || {});
                 break;
             case 'start_login':
@@ -945,7 +950,7 @@ export default React.createClass({
                 });
             }
             dis.dispatch({
-                action: 'view_set_mxid',
+                action: 'require_registration',
                 // If the set_mxid dialog is cancelled, view /home because if the browser
                 // was pointing at /user/@someone:domain?action=chat, the URL needs to be
                 // reset so that they can revisit /user/.. // (and trigger

src/i18n/strings/en_EN.json

@@ -87,6 +87,8 @@
     "Unable to enable Notifications": "Unable to enable Notifications",
     "This email address was not found": "This email address was not found",
     "Your email address does not appear to be associated with a Matrix ID on this Homeserver.": "Your email address does not appear to be associated with a Matrix ID on this Homeserver.",
+    "Registration Required": "Registration Required",
+    "You need to register to do this. Would you like to register now?": "You need to register to do this. Would you like to register now?",
     "Default": "Default",
     "Restricted": "Restricted",
     "Moderator": "Moderator",
@@ -146,7 +148,6 @@
     "The signing key you provided matches the signing key you received from %(userId)s's device %(deviceId)s. Device marked as verified.": "The signing key you provided matches the signing key you received from %(userId)s's device %(deviceId)s. Device marked as verified.",
     "Displays action": "Displays action",
     "Forces the current outbound group session in an encrypted room to be discarded": "Forces the current outbound group session in an encrypted room to be discarded",
-    "Error Discarding Session": "Error Discarding Session",
     "Unrecognised command:": "Unrecognised command:",
     "Reason": "Reason",
     "%(targetName)s accepted the invitation for %(displayName)s.": "%(targetName)s accepted the invitation for %(displayName)s.",
@@ -398,8 +399,6 @@
     "At this time it is not possible to reply with a file so this will be sent without being a reply.": "At this time it is not possible to reply with a file so this will be sent without being a reply.",
     "Upload Files": "Upload Files",
     "Are you sure you want to upload the following files?": "Are you sure you want to upload the following files?",
-    "This room has been replaced and is no longer active.": "This room has been replaced and is no longer active.",
-    "The conversation continues here.": "The conversation continues here.",
     "Encrypted room": "Encrypted room",
     "Unencrypted room": "Unencrypted room",
     "Hangup": "Hangup",
@@ -411,6 +410,8 @@
     "Send a reply (unencrypted)…": "Send a reply (unencrypted)…",
     "Send an encrypted message…": "Send an encrypted message…",
     "Send a message (unencrypted)…": "Send a message (unencrypted)…",
+    "This room has been replaced and is no longer active.": "This room has been replaced and is no longer active.",
+    "The conversation continues here.": "The conversation continues here.",
     "You do not have permission to post to this room": "You do not have permission to post to this room",
     "Turn Markdown on": "Turn Markdown on",
     "Turn Markdown off": "Turn Markdown off",
@@ -1201,6 +1202,7 @@
     "Failed to fetch avatar URL": "Failed to fetch avatar URL",
     "Set a display name:": "Set a display name:",
     "Upload an avatar:": "Upload an avatar:",
+    "Unable to query for supported registration methods": "Unable to query for supported registration methods",
     "This server does not support authentication with a phone number.": "This server does not support authentication with a phone number.",
     "Missing password.": "Missing password.",
     "Passwords don't match.": "Passwords don't match.",