feat: create first version of authorizer client (#1)

Author: g-otn

.gitignore

@@ -32,3 +32,134 @@ override.tf.json
 # Ignore CLI configuration files
 .terraformrc
 terraform.rc
+
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index.js

@@ -0,0 +1,38 @@
+const jwt = require("jsonwebtoken");
+
+// Constants.
+const JWT_PUBLIC_KEY = process.env.JWT_PUBLIC_KEY;
+
+exports.handler = async (event) => {
+  // Gets event header.
+  const header =
+    typeof event.header === "string" ? JSON.parse(event.header) : event.header;
+
+  // Needs to be authorized by a given token.
+  const token = header.token;
+
+  // Object that stores values used by 'jsonwebtoken - verify' function call.
+  const jwtSettings = {
+    publicKey: JWT_PUBLIC_KEY,
+    options: {
+      algorithms: ["RS256"],
+    },
+  };
+
+  try {
+    // Verify and decode the JWT token.
+    const decoded = jwt.verify(
+      token,
+      jwtSettings.publicKey,
+      jwtSettings.options
+    );
+
+    if (decoded.sub == null) {
+      return false;
+    }
+
+    return true;
+  } catch (error) {
+    return false;
+  }
+};