Fix/user update issue (#4123)

* Adds failing test,

the _User object is not updated as soon as you pass some authData part of the PUT

* Do not run the DB call when updating the user with new auth data, just part of the rest

spec/ParseUser.spec.js

@@ -3116,4 +3116,58 @@ describe('Parse.User testing', () => {
       });
     });
   });
+
+  it('should be able to update user with authData passed', (done) => {
+    let objectId;
+    let sessionToken;
+
+    function validate(block) {
+      return rp.get({
+        url: `http://localhost:8378/1/classes/_User/${objectId}`,
+        headers: {
+          'X-Parse-Application-Id': Parse.applicationId,
+          'X-Parse-REST-API-Key': 'rest',
+          'X-Parse-Session-Token': sessionToken
+        },
+        json: true,
+      }).then(block);
+    }
+
+    rp.post({
+      url: 'http://localhost:8378/1/classes/_User',
+      headers: {
+        'X-Parse-Application-Id': Parse.applicationId,
+        'X-Parse-REST-API-Key': 'rest',
+      },
+      json: { key: "value", authData: {anonymous: {id: '00000000-0000-0000-0000-000000000001'}}}
+    }).then((body) => {
+      objectId = body.objectId;
+      sessionToken = body.sessionToken;
+      expect(sessionToken).toBeDefined();
+      expect(objectId).toBeDefined();
+      return validate((user) => { // validate that keys are set on creation
+        expect(user.key).toBe("value");
+      });
+    }).then(() => {
+      // update the user
+      const options = {
+        url: `http://localhost:8378/1/classes/_User/${objectId}`,
+        headers: {
+          'X-Parse-Application-Id': Parse.applicationId,
+          'X-Parse-REST-API-Key': 'rest',
+          'X-Parse-Session-Token': sessionToken
+        },
+        json: { key: "otherValue", authData: {anonymous: {id: '00000000-0000-0000-0000-000000000001'}}}
+      }
+      return rp.put(options);
+    }).then(() => {
+      return validate((user) => { // validate that keys are set on update
+        expect(user.key).toBe("otherValue");
+      });
+    }).then(() => {
+      done();
+    })
+      .then(done)
+      .catch(done.fail);
+  });
 });

src/RestWrite.js

@@ -311,13 +311,12 @@ RestWrite.prototype.handleAuthData = function(authData) {
         // need to set the objectId first otherwise location has trailing undefined
         this.data.objectId = userResult.objectId;
 
-        // Determine if authData was updated
-
-        this.response = {
-          response: userResult,
-          location: this.location()
-        };
-
+        if (!this.query || !this.query.objectId) { // this a login call, no userId passed
+          this.response = {
+            response: userResult,
+            location: this.location()
+          };
+        }
         // If we didn't change the auth data, just keep going
         if (!hasMutatedAuthData) {
           return;
@@ -327,13 +326,20 @@ RestWrite.prototype.handleAuthData = function(authData) {
         // We should update the token and let the user in
         // We should only check the mutated keys
         return this.handleAuthDataValidation(mutatedAuthData).then(() => {
-          // Assign the new authData in the response
-          Object.keys(mutatedAuthData).forEach((provider) => {
-            this.response.response.authData[provider] = mutatedAuthData[provider];
-          });
-          // Run the DB update directly, as 'master'
-          // Just update the authData part
-          return this.config.database.update(this.className, {objectId: this.data.objectId}, {authData: mutatedAuthData}, {});
+          // IF we have a response, we'll skip the database operation / beforeSave / afterSave etc...
+          // we need to set it up there.
+          // We are supposed to have a response only on LOGIN with authData, so we skip those
+          // If we're not logging in, but just updating the current user, we can safely skip that part
+          if (this.response) {
+            // Assign the new authData in the response
+            Object.keys(mutatedAuthData).forEach((provider) => {
+              this.response.response.authData[provider] = mutatedAuthData[provider];
+            });
+            // Run the DB update directly, as 'master'
+            // Just update the authData part
+            // Then we're good for the user, early exit of sorts
+            return this.config.database.update(this.className, {objectId: this.data.objectId}, {authData: mutatedAuthData}, {});
+          }
         });
       } else if (userId) {
         // Trying to update auth data but users