Add example with express js

Author: lakhansamani

with-express-js/auth_middleware.js

@@ -0,0 +1,41 @@
+const { Authorizer } = require("@authorizerdev/authorizer-js");
+
+const authRef = new Authorizer({
+  authorizerURL: "https://demo.authorizer.dev",
+  redirectURL: "https://demo.authorizer.dev/app",
+  clientID: "96fed66c-9779-4694-a79a-260fc489ce33",
+});
+
+const authMiddleware = async (req, res, next) => {
+  const authHeader = req.headers.authorization;
+  if (!authHeader) {
+    return res.status(403).json({ error: "Authorization not found" });
+  }
+
+  const splitHeader = authHeader.split(" ");
+  if (splitHeader.length != 2) {
+    return res.status(403).json({ error: "Invalid auth header" });
+  }
+
+  if (splitHeader[0].toLowerCase() != "bearer") {
+    return res.status(403).json({ error: "Bearer token not found" });
+  }
+
+  const token = splitHeader[1];
+  // Validate jwt token via authorizer sdk
+  try {
+    const res = await authRef.validateJWTToken({
+      token,
+      token_type: "id_token", // This can be access_token, refresh_token
+      // roles: [user] // specify roles that you want to validate jwt for, by default it will just verify jwt.
+    });
+    req.user = res.claims;
+  } catch (err) {
+    console.error(err);
+    return res.status(403).json({ error: "Invalid JWT token" });
+  }
+
+  next();
+};
+
+module.exports = authMiddleware;

with-express-js/index.js

@@ -0,0 +1,13 @@
+const express = require("express");
+const authMiddleware = require("./auth_middleware");
+
+const app = express();
+const port = `3000`;
+
+app.get("/", authMiddleware, (req, res) => {
+  res.send("Hello World");
+});
+
+app.listen(port, () => {
+  console.log(`[server]: Server is running at http://localhost:${port}`);
+});