Add launchable

js/core/Auth.js

@@ -0,0 +1,36 @@
+export class Auth {
+  constructor(baseUrl = "http://localhost:5000") {
+    this.baseUrl = baseUrl;
+  }
+
+  /**
+   * Verify a session token against the fake auth API.
+   * Returns the user ID if valid, or null if invalid.
+   */
+  async verifySessionToken(token) {
+    try {
+      const res = await fetch(`${this.baseUrl}/api/verify/${encodeURIComponent(token)}`);
+      if (!res.ok) return null;
+      const data = await res.json();
+      return data.id ?? null;
+    } catch (err) {
+      console.warn("[Auth] verifySessionToken error:", err);
+      return null;
+    }
+  }
+
+  /**
+   * Look up the user's display name by ID.
+   */
+  async getUserNameById(id) {
+    try {
+      const res = await fetch(`${this.baseUrl}/api/users`);
+      if (!res.ok) return "Unknown";
+      const data = await res.json();
+      return data[id] ?? `User${id}`;
+    } catch (err) {
+      console.warn("[Auth] getUserNameById error:", err);
+      return `User${id}`;
+    }
+  }
+}