Support accounts with cross signing but no SSSS

At least at the login stage.

Fixes https://github.com/vector-im/riot-web/issues/13894

src/components/structures/MatrixChat.tsx

@@ -1900,10 +1900,12 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             return setLoggedInPromise;
         }
 
-        // Test for the master cross-signing key in SSSS as a quick proxy for
-        // whether cross-signing has been set up on the account.
-        const masterKeyInStorage = !!cli.getAccountData("m.cross_signing.master");
-        if (masterKeyInStorage) {
+        // wait for the client to finish downloading cross-signing keys for us so we
+        // know whether or not we have keys set up on this account
+        await cli.downloadKeys([cli.getUserId()]);
+
+        const crossSigningIsSetUp = cli.getStoredCrossSigningForUser(cli.getUserId());
+        if (crossSigningIsSetUp) {
             this.setStateForNewView({ view: Views.COMPLETE_SECURITY });
         } else if (await cli.doesServerSupportUnstableFeature("org.matrix.e2e_cross_signing")) {
             this.setStateForNewView({ view: Views.E2E_SETUP });

src/components/structures/auth/SetupEncryptionBody.js

@@ -16,7 +16,7 @@ limitations under the License.
 
 import React from 'react';
 import PropTypes from 'prop-types';
-import { _t } from '../../../languageHandler';
+import { _t, _td } from '../../../languageHandler';
 import { MatrixClientPeg } from '../../../MatrixClientPeg';
 import * as sdk from '../../../index';
 import withValidation from '../../views/elements/Validation';
@@ -196,11 +196,27 @@ export default class SetupEncryptionBody extends React.Component {
         } else if (phase === PHASE_INTRO) {
             const store = SetupEncryptionStore.sharedInstance();
             let recoveryKeyPrompt;
-            if (keyHasPassphrase(store.keyInfo)) {
+            if (store.keyInfo && keyHasPassphrase(store.keyInfo)) {
                 recoveryKeyPrompt = _t("Use Recovery Key or Passphrase");
-            } else {
+            } else if (store.keyInfo) {
                 recoveryKeyPrompt = _t("Use Recovery Key");
             }
+
+            let useRecoveryKeyButton;
+            let resetKeysCaption;
+            if (recoveryKeyPrompt) {
+                useRecoveryKeyButton = <AccessibleButton kind="link" onClick={this._onUseRecoveryKeyClick}>
+                    {recoveryKeyPrompt}
+                </AccessibleButton>;
+                resetKeysCaption = _td(
+                    "If you've forgotten your recovery key you can <button>set up new recovery options</button>",
+                );
+            } else {
+                resetKeysCaption = _td(
+                    "If you have no other devices you can <button>set up new recovery options</button>",
+                );
+            }
+
             return (
                 <div>
                     <p>{_t(
@@ -224,16 +240,12 @@ export default class SetupEncryptionBody extends React.Component {
                     </div>
 
                     <div className="mx_CompleteSecurity_actionRow">
-                        <AccessibleButton kind="link" onClick={this._onUseRecoveryKeyClick}>
-                            {recoveryKeyPrompt}
-                        </AccessibleButton>
+                        {useRecoveryKeyButton}
                         <AccessibleButton kind="danger" onClick={this.onSkipClick}>
                             {_t("Skip")}
                         </AccessibleButton>
                     </div>
-                    <div className="mx_CompleteSecurity_resetText">{_t(
-                        "If you've forgotten your recovery key you can " +
-                        "<button>set up new recovery options</button>", {}, {
+                    <div className="mx_CompleteSecurity_resetText">{_t(resetKeysCaption, {}, {
                             button: sub => <AccessibleButton
                                 element="span" className="mx_linkButton" onClick={this._onResetClick}
                             >

src/i18n/strings/en_EN.json

@@ -2101,6 +2101,7 @@
     "Looks good!": "Looks good!",
     "Use Recovery Key or Passphrase": "Use Recovery Key or Passphrase",
     "Use Recovery Key": "Use Recovery Key",
+    "If you have no other devices you can <button>set up new recovery options</button>": "If you have no other devices you can <button>set up new recovery options</button>",
     "Confirm your identity by verifying this login from one of your other sessions, granting it access to encrypted messages.": "Confirm your identity by verifying this login from one of your other sessions, granting it access to encrypted messages.",
     "This requires the latest Riot on your other devices:": "This requires the latest Riot on your other devices:",
     "or another cross-signing capable Matrix client": "or another cross-signing capable Matrix client",

src/stores/SetupEncryptionStore.js

@@ -68,7 +68,7 @@ export class SetupEncryptionStore extends EventEmitter {
 
     async fetchKeyInfo() {
         const keys = await MatrixClientPeg.get().isSecretStored('m.cross_signing.master', false);
-        if (Object.keys(keys).length === 0) {
+        if (!keys || Object.keys(keys).length === 0) {
             this.keyId = null;
             this.keyInfo = null;
         } else {