remove and re-add platform on server restart

src/backend/index.ts

@@ -214,9 +214,11 @@ ltijs.app.post("/lti/finish-deeplink", async (req, res) => {
 const setup = async () => {
   await ltijs.deploy();
 
-  /**
-   * Register platform
-   */
+  // Remove platform (if it exists)
+  // There might be already an entry in mongodb for this platform. On restart, we want to remove it and re-add it to prevent the issue `bad decrypt`. See: https://github.com/Cvmcosta/ltijs/issues/119#issuecomment-882898770
+  ltijs.deletePlatform(ltiPlatform.url, ltiPlatform.clientId);
+
+  // Register platform
   await ltijs.registerPlatform({
     url: ltiPlatform.url,
     name: ltiPlatform.name,
@@ -228,6 +230,7 @@ const setup = async () => {
       key: ltiPlatform.keysetEndpoint,
     },
   });
+  // Register Moodle as platform
   // await ltijs.registerPlatform({
   //   url: "http://localhost",
   //   name: "Moodle",

src/frontend/App.tsx

@@ -1,6 +1,5 @@
 import { SerloEditor } from "@serlo/editor";
 import { useEffect, useState } from "react";
-import * as jwt from "jsonwebtoken";
 
 function App() {
   // TODO: Make editorState always contain valid value
@@ -42,8 +41,6 @@ function App() {
   const ltik = urlParams.get("ltik");
   if (!accessToken || !ltik) return <p>Access token or ltik was missing!</p>;
 
-  const decodedAccessToken = jwt.decode(accessToken);
-
   const isDeeplink = urlParams.get("deeplink");
 
   return (
@@ -83,7 +80,7 @@ function App() {
       </SerloEditor>
       <h2>Debug info</h2>
       <h3>Access token:</h3>
-      <div>{JSON.stringify(decodedAccessToken)}</div>
+      <div>{accessToken}</div>
       <h3>ltik:</h3>
       <div>{ltik}</div>
     </>