Update login script to only login when the JWT expires

- Move Login script to external file

package.json

@@ -10,7 +10,7 @@
     "url": "https://github.com/NASA-AMMOS/aerie-gateway.git"
   },
   "scripts": {
-    "build": "npm run clean && tsc",
+    "build": "npm run clean && tsc && cp ./src/packages/api-playground/pre-request-script dist/packages/api-playground",
     "clean": "rm -rf dist",
     "format": "prettier --write ./src",
     "lint": "eslint ./src --ext .js,.ts",

src/packages/api-playground/api-playground.ts

@@ -1,27 +1,13 @@
 import { altairExpress } from 'altair-express-middleware';
 import type { Express } from 'express';
 import { getEnv } from '../../env.js';
+import { readFileSync } from 'fs';
 
 export default (app: Express) => {
   const { GQL_API_URL: endpointURL, GQL_API_WS_URL: subscriptionsEndpoint } = getEnv();
   const initialQuery = '{ plan { id name } }';
   const initialHeaders = { Authorization: 'Bearer {{user}}', 'x-hasura-role': 'viewer' };
-  const initialPreRequestScript =
-  `
-  // Fetch a new token from the Gateway
-  const res = await altair.helpers.request(
-    'POST',
-    '/auth/login', // AUTH ENDPOINT OF THE DEPLOYMENT
-  {
-    body: { "username": "<YOUR_AERIE_USERNAME>", "password": "<YOUR_AERIE_PASSWORD>"}, // CREDENTIALS TO LOG IN AS
-    headers: {"Content-Type": "application/json"}
-  });
-  if(res.success) {
-    const token = res.token;
-    await altair.helpers.setEnvironment("user", token);
-  } else {
-    altair.log(res);
-  }`;
+  const initialPreRequestScript = readFileSync('dist/packages/api=p/pre-request-script').toString();
   const initialSettings = {
     addQueryDepthLimit: 5,
     enableExperimental: true,

src/packages/api-playground/pre-request-script

@@ -0,0 +1,24 @@
+const nowInSeconds = () => Date.now() / 1000;
+const tokenExpiry = await altair.storage.get("token_exp") || 0;
+
+if (nowInSeconds() >= Number(tokenExpiry)) {
+  // Fetch a new token from the Gateway
+  const res = await altair.helpers.request(
+    'POST',
+    '/auth/login', // AUTH ENDPOINT OF THE DEPLOYMENT
+    {
+      body: { "username": "<YOUR_AERIE_USERNAME>", "password": "<YOUR_AERIE_PASSWORD>"}, // CREDENTIALS TO LOG IN AS
+      headers: {"Content-Type": "application/json"}
+    });
+  if(res.success) {
+    const token = res.token;
+    await altair.storage.set("token", token);
+    // Set JWT expiry
+    const atob = await altair.importModule('atob');
+    const body = JSON.parse(atob(token.split('.')[1]));
+    await altair.storage.set("token_exp", body.exp);
+  } else { altair.log(res); }
+}
+// Set the token in the environment
+const token = await altair.storage.get("token");
+altair.helpers.setEnvironment('user', token);