feat(auth): add public GET /api/auth/config endpoint

modules/auth/controllers/auth.controller.js

@@ -207,11 +207,27 @@ const oauthCallback = async (req, res, next) => {
   })(req, res, next);
 };
 
+/**
+ * @desc Endpoint to expose public auth sign-in/up feature flags
+ * @param {Object} req - Express request object
+ * @param {Object} res - Express response object
+ * @returns {void} Sends the public auth configuration (sign flags only) in the HTTP response
+ */
+const getConfig = (_req, res) => {
+  responses.success(res, 'Auth config')({
+    sign: {
+      in: !!config.sign.in,
+      up: !!config.sign.up,
+    },
+  });
+};
+
 export default {
   signup,
   signin,
   token,
   oauthCall,
   oauthCallback,
   checkOAuthUserProfile,
+  getConfig,
 };

modules/auth/routes/auth.routes.js

@@ -13,6 +13,9 @@ import authPassword from '../controllers/auth.password.controller.js';
 export default (app) => {
   const authLimiter = rateLimit(config.rateLimit.auth);
 
+  // Public auth config (no authentication required, rate-limited)
+  app.route('/api/auth/config').get(authLimiter, auth.getConfig);
+
   // Setting up the users password api
   app.route('/api/auth/forgot').post(authLimiter, authPassword.forgot);
   app.route('/api/auth/reset/:token').get(authLimiter, authPassword.validateResetToken);

modules/auth/tests/auth.integration.tests.js

@@ -804,6 +804,34 @@ describe('Auth integration tests:', () => {
     });
   });
 
+  describe('Config endpoint', () => {
+    test('should return sign flags reflecting current config', async () => {
+      const result = await agent.get('/api/auth/config').expect(200);
+      expect(result.body.data).toEqual({
+        sign: {
+          in: expect.any(Boolean),
+          up: expect.any(Boolean),
+        },
+      });
+    });
+
+    test('should return false when sign.up is disabled', async () => {
+      const original = config.sign.up;
+      config.sign.up = false;
+      const result = await agent.get('/api/auth/config').expect(200);
+      expect(result.body.data.sign.up).toBe(false);
+      config.sign.up = original;
+    });
+
+    test('should return false when sign.in is disabled', async () => {
+      const original = config.sign.in;
+      config.sign.in = false;
+      const result = await agent.get('/api/auth/config').expect(200);
+      expect(result.body.data.sign.in).toBe(false);
+      config.sign.in = original;
+    });
+  });
+
   // Mongoose disconnect
   afterAll(async () => {
     try {