feat(auth): warn about empty token, return falsy result

BREAKING CHANGE: now if login/register returns no value for token, unsuccessful NbAuthResult is returned

Author: nnixaa

docs/output.json

@@ -264,6 +264,26 @@
           "isStatic": false,
           "shortDescription": "",
           "description": ""
+        },
+        {
+          "examples": [],
+          "params": [
+            {
+              "name": "module",
+              "type": "string",
+              "required": null,
+              "shortDescription": "",
+              "description": ""
+            }
+          ],
+          "platform": null,
+          "name": "validateToken",
+          "type": [
+            "any"
+          ],
+          "isStatic": false,
+          "shortDescription": "",
+          "description": ""
         }
       ],
       "name": "NbEmailPassAuthProvider",

src/framework/auth/providers/email-pass-auth.provider.ts

@@ -205,6 +205,7 @@ export class NbEmailPassAuthProvider extends NbAbstractAuthProvider {
 
           return res;
         }),
+        this.validateToken('login'),
         map((res) => {
           return new NbAuthResult(
             true,
@@ -245,6 +246,7 @@ export class NbEmailPassAuthProvider extends NbAbstractAuthProvider {
 
           return res;
         }),
+        this.validateToken('register'),
         map((res) => {
           return new NbAuthResult(
             true,
@@ -401,6 +403,21 @@ export class NbEmailPassAuthProvider extends NbAbstractAuthProvider {
       );
   }
 
+  protected validateToken (module: string): any {
+    return map((res) => {
+      const token = this.getConfigValue('token.getter')(module, res);
+      if (!token) {
+        const key = this.getConfigValue('token.key');
+        console.warn(`NbEmailPassAuthProvider:
+                          Token is not provided under '${key}' key
+                          with getter '${this.getConfigValue('token.getter')}', check your auth configuration.`);
+
+        throw new Error('Could not extract token from the response.');
+      }
+      return res;
+    });
+  }
+
   protected getActionEndpoint(action: string): string {
     const actionEndpoint: string = this.getConfigValue(`${action}.endpoint`);
     const baseEndpoint: string = this.getConfigValue('baseEndpoint');