Merge pull request #15114 from vector-im/jaywink/jitsi-openidjwt-auth

Support usage of Jitsi widgets with "openidtoken-jwt" auth

package.json

@@ -59,6 +59,7 @@
     "browser-request": "^0.3.3",
     "gfm.css": "^1.1.2",
     "highlight.js": "^9.13.1",
+    "jsrsasign": "^9.1.5",
     "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
     "matrix-react-sdk": "github:matrix-org/matrix-react-sdk#develop",
     "olm": "https://packages.matrix.org/npm/olm/olm-3.1.4.tgz",

src/vector/jitsi/index.html

@@ -11,9 +11,11 @@
         <div class="joinConferencePrompt">
             <!-- TODO: i18n -->
             <h2>Jitsi Video Conference</h2>
+            <div id="widgetActionContainer">
                 <button type="button" id="joinButton">Join Conference</button>
             </div>
         </div>
+    </div>
 </div>
 <!-- This script is not webpacked, and the script is downloaded at build time -->
 <script src="./jitsi_external_api.min.js"></script>

src/vector/jitsi/index.ts

@@ -18,7 +18,10 @@ limitations under the License.
 require("./index.scss");
 
 import * as qs from 'querystring';
-import { Capability, WidgetApi } from "matrix-react-sdk/src/widgets/WidgetApi";
+import {Capability, WidgetApi} from 'matrix-react-sdk/src/widgets/WidgetApi';
+import {KJUR} from 'jsrsasign';
+
+const JITSI_OPENIDTOKEN_JWT_AUTH = 'openidtoken-jwt';
 
 // Dev note: we use raw JS without many dependencies to reduce bundle size.
 // We do not need all of React to render a Jitsi conference.
@@ -33,6 +36,8 @@ let conferenceId: string;
 let displayName: string;
 let avatarUrl: string;
 let userId: string;
+let jitsiAuth: string;
+let roomId: string;
 
 let widgetApi: WidgetApi;
 
@@ -69,40 +74,118 @@ let widgetApi: WidgetApi;
         displayName = qsParam('displayName', true);
         avatarUrl = qsParam('avatarUrl', true); // http not mxc
         userId = qsParam('userId');
+        jitsiAuth = qsParam('auth', true);
+        roomId = qsParam('roomId', true);
 
         if (widgetApi) {
             await widgetApi.waitReady();
             await widgetApi.setAlwaysOnScreen(false); // start off as detachable from the screen
+
+            // See https://github.com/matrix-org/prosody-mod-auth-matrix-user-verification
+            if (jitsiAuth === JITSI_OPENIDTOKEN_JWT_AUTH) {
+                // Request credentials, give callback to continue when received
+                widgetApi.requestOpenIDCredentials(credentialsResponseCallback);
+            } else {
+                enableJoinButton();
             }
-
             // TODO: register widgetApi listeners for PTT controls (https://github.com/vector-im/riot-web/issues/12795)
-
-        document.getElementById("joinButton").onclick = () => joinConference();
+        } else {
+            enableJoinButton();
+        }
     } catch (e) {
         console.error("Error setting up Jitsi widget", e);
-        document.getElementById("jitsiContainer").innerText = "Failed to load Jitsi widget";
-        switchVisibleContainers();
+        document.getElementById("widgetActionContainer").innerText = "Failed to load Jitsi widget";
     }
 })();
 
+/**
+ * Enable or show error depending on what the credentials response is.
+ */
+function credentialsResponseCallback() {
+    if (widgetApi.openIDCredentials) {
+        console.info('Successfully got OpenID credentials.');
+        enableJoinButton();
+    } else {
+        console.warn('OpenID credentials request was blocked by user.');
+        document.getElementById("widgetActionContainer").innerText = "Failed to load Jitsi widget";
+    }
+}
+
+function enableJoinButton() {
+    document.getElementById("joinButton").onclick = () => joinConference();
+}
+
 function switchVisibleContainers() {
     inConference = !inConference;
     document.getElementById("jitsiContainer").style.visibility = inConference ? 'unset' : 'hidden';
     document.getElementById("joinButtonContainer").style.visibility = inConference ? 'hidden' : 'unset';
 }
 
+/**
+ * Create a JWT token fot jitsi openidtoken-jwt auth
+ *
+ * See https://github.com/matrix-org/prosody-mod-auth-matrix-user-verification
+ */
+function createJWTToken() {
+    // Header
+    const header = {alg: 'HS256', typ: 'JWT'};
+    // Payload
+    const payload = {
+        // As per Jitsi token auth, `iss` needs to be set to something agreed between
+        // JWT generating side and Prosody config. Since we have no configuration for
+        // the widgets, we can't set one anywhere. Using the Jitsi domain here probably makes sense.
+        iss: jitsiDomain,
+        sub: jitsiDomain,
+        aud: `https://${jitsiDomain}`,
+        room: "*",
+        context: {
+            matrix: {
+                token: widgetApi.openIDCredentials.accessToken,
+                room_id: roomId,
+            },
+            user: {
+                avatar: avatarUrl,
+                name: displayName,
+            },
+        },
+    };
+    // Sign JWT
+    // The secret string here is irrelevant, we're only using the JWT
+    // to transport data to Prosody in the Jitsi stack.
+    return KJUR.jws.JWS.sign(
+        'HS256',
+        JSON.stringify(header),
+        JSON.stringify(payload),
+        'notused',
+    );
+}
+
 function joinConference() { // event handler bound in HTML
+    let jwt;
+    if (jitsiAuth === JITSI_OPENIDTOKEN_JWT_AUTH) {
+        if (!widgetApi.openIDCredentials || !widgetApi.openIDCredentials.accessToken) {
+            // We've failing to get a token, don't try to init conference
+            console.warn('Expected to have an OpenID credential, cannot initialize widget.');
+            document.getElementById("widgetActionContainer").innerText = "Failed to load Jitsi widget";
+            return;
+        }
+        jwt = createJWTToken();
+    }
+
     switchVisibleContainers();
 
+    if (widgetApi) {
+        // ignored promise because we don't care if it works
         // noinspection JSIgnoredPromiseFromCall
-    if (widgetApi) widgetApi.setAlwaysOnScreen(true); // ignored promise because we don't care if it works
+        widgetApi.setAlwaysOnScreen(true);
+    }
 
     console.warn(
         "[Jitsi Widget] The next few errors about failing to parse URL parameters are fine if " +
         "they mention 'external_api' or 'jitsi' in the stack. They're just Jitsi Meet trying to parse " +
         "our fragment values and not recognizing the options.",
     );
-    const meetApi = new JitsiMeetExternalAPI(jitsiDomain, {
+    const options = {
         width: "100%",
         height: "100%",
         parentNode: document.querySelector("#jitsiContainer"),
@@ -113,7 +196,10 @@ function joinConference() { // event handler bound in HTML
             MAIN_TOOLBAR_BUTTONS: [],
             VIDEO_LAYOUT_FIT: "height",
         },
-    });
+        jwt: jwt,
+    };
+
+    const meetApi = new JitsiMeetExternalAPI(jitsiDomain, options);
     if (displayName) meetApi.executeCommand("displayName", displayName);
     if (avatarUrl) meetApi.executeCommand("avatarUrl", avatarUrl);
     if (userId) meetApi.executeCommand("email", userId);
@@ -121,8 +207,11 @@ function joinConference() { // event handler bound in HTML
     meetApi.on("readyToClose", () => {
         switchVisibleContainers();
 
+        if (widgetApi) {
+            // ignored promise because we don't care if it works
             // noinspection JSIgnoredPromiseFromCall
-        if (widgetApi) widgetApi.setAlwaysOnScreen(false); // ignored promise because we don't care if it works
+            widgetApi.setAlwaysOnScreen(false);
+        }
 
         document.getElementById("jitsiContainer").innerHTML = "";
     });

yarn.lock

@@ -6914,6 +6914,11 @@ jsprim@^1.2.2:
     json-schema "0.2.3"
     verror "1.10.0"
 
+jsrsasign@^9.1.5:
+  version "9.1.5"
+  resolved "https://registry.yarnpkg.com/jsrsasign/-/jsrsasign-9.1.5.tgz#fe286425d2c05b2d0865d24ded53e34b12abd2ca"
+  integrity sha512-iJLF8FvZHlwyQudrRtQomHj1HdPAcM8QSRTt0FJo8a6iFgaGCpKUrE7lWyELpAjrFs8jUC/Azc0vfhlj3yqHPQ==
+
 jsx-ast-utils@^2.2.3:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/jsx-ast-utils/-/jsx-ast-utils-2.3.0.tgz#edd727794ea284d7fda575015ed1b0cde0289ab6"