Pass screenAfterLogin through SSO in the callback url

src/BasePlatform.js

@@ -167,13 +167,9 @@ export default class BasePlatform {
 
     setLanguage(preferredLangs: string[]) {}
 
-    getSSOCallbackUrl(hsUrl: string, isUrl: string): URL {
+    getSSOCallbackUrl(hsUrl: string, isUrl: string, fragmentAfterLogin: string): URL {
         const url = new URL(window.location.href);
-        // XXX: at this point, the fragment will always be #/login, which is no
-        // use to anyone. Ideally, we would get the intended fragment from
-        // MatrixChat.screenAfterLogin so that you could follow #/room links etc
-        // through an SSO login.
-        url.hash = "";
+        url.hash = fragmentAfterLogin || "";
         url.searchParams.set("homeserver", hsUrl);
         url.searchParams.set("identityServer", isUrl);
         return url;
@@ -183,9 +179,11 @@ export default class BasePlatform {
      * Begin Single Sign On flows.
      * @param {MatrixClient} mxClient the matrix client using which we should start the flow
      * @param {"sso"|"cas"} loginType the type of SSO it is, CAS/SSO.
+     * @param {string} fragmentAfterLogin the hash to pass to the app during sso callback.
      */
-    startSingleSignOn(mxClient: MatrixClient, loginType: "sso"|"cas") {
-        const callbackUrl = this.getSSOCallbackUrl(mxClient.getHomeserverUrl(), mxClient.getIdentityServerUrl());
+    startSingleSignOn(mxClient: MatrixClient, loginType: "sso" | "cas", fragmentAfterLogin: string) {
+        const callbackUrl = this.getSSOCallbackUrl(mxClient.getHomeserverUrl(), mxClient.getIdentityServerUrl(),
+            fragmentAfterLogin);
         window.location.href = mxClient.getSsoLoginUrl(callbackUrl.toString(), loginType); // redirect to SSO
     }
 

src/components/structures/MatrixChat.tsx

@@ -1973,6 +1973,11 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
     render() {
         // console.log(`Rendering MatrixChat with view ${this.state.view}`);
 
+        let fragmentAfterLogin = "";
+        if (this.props.initialScreenAfterLogin) {
+            fragmentAfterLogin = `/${this.props.initialScreenAfterLogin.screen}`;
+        }
+
         let view;
 
         if (this.state.view === Views.LOADING) {
@@ -2052,7 +2057,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             }
         } else if (this.state.view === Views.WELCOME) {
             const Welcome = sdk.getComponent('auth.Welcome');
-            view = <Welcome {...this.getServerProperties()} />;
+            view = <Welcome {...this.getServerProperties()} fragmentAfterLogin={fragmentAfterLogin} />;
         } else if (this.state.view === Views.REGISTER) {
             const Registration = sdk.getComponent('structures.auth.Registration');
             view = (
@@ -2091,6 +2096,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                     defaultDeviceDisplayName={this.props.defaultDeviceDisplayName}
                     onForgotPasswordClick={this.onForgotPasswordClick}
                     onServerConfigChange={this.onServerConfigChange}
+                    fragmentAfterLogin={fragmentAfterLogin}
                     {...this.getServerProperties()}
                 />
             );
@@ -2100,6 +2106,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 <SoftLogout
                     realQueryParams={this.props.realQueryParams}
                     onTokenLoginCompleted={this.props.onTokenLoginCompleted}
+                    fragmentAfterLogin={fragmentAfterLogin}
                 />
             );
         } else {

src/components/structures/auth/Login.js

@@ -355,7 +355,8 @@ export default createReactClass({
             ev.preventDefault();
             ev.stopPropagation();
             const ssoKind = step === 'm.login.sso' ? 'sso' : 'cas';
-            PlatformPeg.get().startSingleSignOn(this._loginLogic.createTemporaryClient(), ssoKind);
+            PlatformPeg.get().startSingleSignOn(this._loginLogic.createTemporaryClient(), ssoKind,
+                this.props.fragmentAfterLogin);
         } else {
             // Don't intercept - just go through to the register page
             this.onRegisterClick(ev);
@@ -628,7 +629,9 @@ export default createReactClass({
                 <SSOButton
                     className="mx_Login_sso_link mx_Login_submit"
                     matrixClient={this._loginLogic.createTemporaryClient()}
-                    loginType={loginType} />
+                    loginType={loginType}
+                    fragmentAfterLogin={this.props.fragmentAfterLogin}
+                />
             </div>
         );
     },

src/components/structures/auth/SoftLogout.js

@@ -244,7 +244,9 @@ export default class SoftLogout extends React.Component {
                     <p>{introText}</p>
                     <SSOButton
                         matrixClient={MatrixClientPeg.get()}
-                        loginType={this.state.loginView === LOGIN_VIEW.CAS ? "cas" : "sso"} />
+                        loginType={this.state.loginView === LOGIN_VIEW.CAS ? "cas" : "sso"}
+                        fragmentAfterLogin={this.props.fragmentAfterLogin}
+                    />
                 </div>
             );
         }

src/components/views/auth/Welcome.js

@@ -45,7 +45,8 @@ export default class Welcome extends React.PureComponent {
             idBaseUrl: isUrl,
         });
         const plaf = PlatformPeg.get();
-        const callbackUrl = plaf.getSSOCallbackUrl(tmpClient.getHomeserverUrl(), tmpClient.getIdentityServerUrl());
+        const callbackUrl = plaf.getSSOCallbackUrl(tmpClient.getHomeserverUrl(), tmpClient.getIdentityServerUrl(),
+            this.props.fragmentAfterLogin);
 
         return (
             <AuthPage>

src/components/views/elements/SSOButton.js

@@ -21,9 +21,9 @@ import PlatformPeg from "../../../PlatformPeg";
 import AccessibleButton from "./AccessibleButton";
 import {_t} from "../../../languageHandler";
 
-const SSOButton = ({matrixClient, loginType, ...props}) => {
+const SSOButton = ({matrixClient, loginType, fragmentAfterLogin, ...props}) => {
     const onClick = () => {
-        PlatformPeg.get().startSingleSignOn(matrixClient, loginType);
+        PlatformPeg.get().startSingleSignOn(matrixClient, loginType, fragmentAfterLogin);
     };
 
     return (
@@ -36,6 +36,7 @@ const SSOButton = ({matrixClient, loginType, ...props}) => {
 SSOButton.propTypes = {
     matrixClient: PropTypes.object.isRequired, // does not use context as may use a temporary client
     loginType: PropTypes.oneOf(["sso", "cas"]), // defaults to "sso" in base-apis
+    fragmentAfterLogin: PropTypes.string,
 };
 
 export default SSOButton;