GraphQL-129: Change generate token schema and add graphql exception

Author: pfantini

app/code/Magento/CustomerGraphQl/Model/Resolver/Customer/Account/GenerateCustomerToken.php

@@ -59,12 +59,16 @@ public function resolve(
         array $value = null,
         array $args = null
     ): Value {
-
-        $token = $this->customerTokenService->createCustomerAccessToken($args['email'], $args['password']);
-        //TODO: exception
-        $result = function () use ($token) {
-            return !empty($token) ? $token : '';
-        };
-        return $this->valueFactory->create($result);
+        try {
+            $token = $this->customerTokenService->createCustomerAccessToken($args['email'], $args['password']);
+            $result = function () use ($token) {
+                return !empty($token) ? $token : '';
+            };
+            return $this->valueFactory->create($result);
+        }catch (\Magento\Framework\Exception\AuthenticationException $e){
+            throw new GraphQlAuthorizationException(
+                __($e->getMessage())
+            );
+        }
     }
 }

app/code/Magento/CustomerGraphQl/etc/schema.graphqls

@@ -6,11 +6,7 @@ type Query {
 }
 
 type Mutation {
-    generateCustomerToken(email: String!, password: String!): GenerateCustomerTokenOutput! @resolver(class: "\\Magento\\CustomerGraphQl\\Model\\Resolver\\Customer\\Account\\GenerateCustomerToken") @doc(description:"Retrieve Customer token")
-}
-
-type GenerateCustomerTokenOutput {
-    token: String! @doc(description: "The customer token")
+    generateCustomerToken(email: String!, password: String!): String! @resolver(class: "\\Magento\\CustomerGraphQl\\Model\\Resolver\\Customer\\Account\\GenerateCustomerToken") @doc(description:"Retrieve Customer token")
 }
 
 type Customer @doc(description: "Customer defines the customer name and address and other details") {