text: // A RestWrite encapsulates everything we need to run an operation
  // that writes to the database.
  // This could be either a "create" or an "update".
  
  import cache from './cache';
  var SchemaController = require('./Controllers/SchemaController');
  var deepcopy = require('deepcopy');
  
  var Auth = require('./Auth');
  var Config = require('./Config');
  var cryptoUtils = require('./cryptoUtils');
  var passwordCrypto = require('./password');
  var Parse = require('parse/node');
  var triggers = require('./triggers');
  
  // query and data are both provided in REST API format. So data
  // types are encoded by plain old objects.
  // If query is null, this is a "create" and the data in data should be
  // created.
  // Otherwise this is an "update" - the object matching the query
  // should get updated with data.
  // RestWrite will handle objectId, createdAt, and updatedAt for
  // everything. It also knows to use triggers and special modifications
  // for the _User class.
  function RestWrite(config, auth, className, query, data, originalData) {
    this.config = config;
    this.auth = auth;
    this.className = className;
    this.storage = {};
    this.runOptions = {};
  
    if (!query && data.objectId) {
      throw new Parse.Error(Parse.Error.INVALID_KEY_NAME, 'objectId ' +
                            'is an invalid field name.');
    }
  
    // When the operation is complete, this.response may have several
    // fields.
    // response: the actual data to be returned
    // status: the http status code. if not present, treated like a 200
    // location: the location header. if not present, no location header
    this.response = null;
  
    // Processing this operation may mutate our data, so we operate on a
    // copy
    this.query = deepcopy(query);
    this.data = deepcopy(data);
    // We never change originalData, so we do not need a deep copy
    this.originalData = originalData;
  
    // The timestamp we'll use for this whole operation
    this.updatedAt = Parse._encode(new Date()).iso;
  }
  
  // A convenient method to perform all the steps of processing the
  // write, in order.
  // Returns a promise for a {response, status, location} object.
  // status and location are optional.
  RestWrite.prototype.execute = function() {
    return Promise.resolve().then(() => {
      return this.getUserAndRoleACL();
    }).then(() => {
      return this.validateClientClassCreation();
    }).then(() => {
      return this.validateSchema();
    }).then(() => {
      return this.handleInstallation();
    }).then(() => {
      return this.handleSession();
    }).then(() => {
      return this.validateAuthData();
    }).then(() => {
      return this.runBeforeTrigger();
    }).then(() => {
      return this.setRequiredFieldsIfNeeded();
    }).then(() => {
      return this.transformUser();
    }).then(() => {
      return this.expandFilesForExistingObjects();
    }).then(() => {
      return this.runDatabaseOperation();
    }).then(() => {
      return this.createSessionTokenIfNeeded();
    }).then(() => {
      return this.handleFollowup();
    }).then(() => {
      return this.runAfterTrigger();
    }).then(() => {
      return this.cleanUserAuthData();
    }).then(() => {
      return this.response;
    });
  };
  
  // Uses the Auth object to get the list of roles, adds the user id
  RestWrite.prototype.getUserAndRoleACL = function() {
    if (this.auth.isMaster) {
      return Promise.resolve();
    }
  
    this.runOptions.acl = ['*'];
  
    if (this.auth.user) {
      return this.auth.getUserRoles().then((roles) => {
        roles.push(this.auth.user.id);
        this.runOptions.acl = this.runOptions.acl.concat(roles);
        return Promise.resolve();
      });
    }else{
      return Promise.resolve();
    }
  };
  
  // Validates this operation against the allowClientClassCreation config.
  RestWrite.prototype.validateClientClassCreation = function() {
    let sysClass = SchemaController.systemClasses;
    if (this.config.allowClientClassCreation === false && !this.auth.isMaster
        && sysClass.indexOf(this.className) === -1) {
      return this.config.database.collectionExists(this.className).then((hasClass) => {
        if (hasClass === true) {
          return Promise.resolve();
        }
  
        throw new Parse.Error(Parse.Error.OPERATION_FORBIDDEN,
                              'This user is not allowed to access ' +
                              'non-existent class: ' + this.className);
      });
    } else {
      return Promise.resolve();
    }
  };
  
  // Validates this operation against the schema.
  RestWrite.prototype.validateSchema = function() {
    return this.config.database.validateObject(this.className, this.data, this.query, this.runOptions);
  };
  
  // Runs any beforeSave triggers against this operation.
  // Any change leads to our data being mutated.
  RestWrite.prototype.runBeforeTrigger = function() {
    if (this.response) {
      return;
    }
  
    // Avoid doing any setup for triggers if there is no 'beforeSave' trigger for this class.
    if (!triggers.triggerExists(this.className, triggers.Types.beforeSave, this.config.applicationId)) {
      return Promise.resolve();
    }
  
    // Cloud code gets a bit of extra data for its objects
    var extraData = {className: this.className};
    if (this.query && this.query.objectId) {
      extraData.objectId = this.query.objectId;
    }
  
    let originalObject = null;
    let updatedObject = triggers.inflate(extraData, this.originalData);
    if (this.query && this.query.objectId) {
      // This is an update for existing object.
      originalObject = triggers.inflate(extraData, this.originalData);
    }
    updatedObject.set(this.sanitizedData());
  
    return Promise.resolve().then(() => {
      return triggers.maybeRunTrigger(triggers.Types.beforeSave, this.auth, updatedObject, originalObject, this.config);
    }).then((response) => {
      if (response && response.object) {
        this.data = response.object;
        this.storage['changedByTrigger'] = true;
        // We should delete the objectId for an update write
        if (this.query && this.query.objectId) {
          delete this.data.objectId
        }
        return this.validateSchema();
      }
    });
  };
  
  RestWrite.prototype.setRequiredFieldsIfNeeded = function() {
    if (this.data) {
      // Add default fields
      this.data.updatedAt = this.updatedAt;
      if (!this.query) {
        this.data.createdAt = this.updatedAt;
  
        // Only assign new objectId if we are creating new object
        if (!this.data.objectId) {
          this.data.objectId = cryptoUtils.newObjectId();
        }
      }
    }
    return Promise.resolve();
  };
  
  // Transforms auth data for a user object.
  // Does nothing if this isn't a user object.
  // Returns a promise for when we're done if it can't finish this tick.
  RestWrite.prototype.validateAuthData = function() {
    if (this.className !== '_User') {
      return;
    }
  
    if (!this.query && !this.data.authData) {
      if (typeof this.data.username !== 'string') {
        throw new Parse.Error(Parse.Error.USERNAME_MISSING,
                              'bad or missing username');
      }
      if (typeof this.data.password !== 'string') {
        throw new Parse.Error(Parse.Error.PASSWORD_MISSING,
                              'password is required');
      }
    }
  
    if (!this.data.authData || !Object.keys(this.data.authData).length) {
      return;
    }
  
    var authData = this.data.authData;
    var providers = Object.keys(authData);
    if (providers.length > 0) {
      let canHandleAuthData = providers.reduce((canHandle, provider) => {
        var providerAuthData = authData[provider];
        var hasToken = (providerAuthData && providerAuthData.id);
        return canHandle && (hasToken || providerAuthData == null);
      }, true);
      if (canHandleAuthData) {
        return this.handleAuthData(authData);
      }
    }
    throw new Parse.Error(Parse.Error.UNSUPPORTED_SERVICE,
                            'This authentication method is unsupported.');
  };
  
  RestWrite.prototype.handleAuthDataValidation = function(authData) {
    let validations = Object.keys(authData).map((provider) => {
      if (authData[provider] === null) {
        return Promise.resolve();
      }
      let validateAuthData = this.config.authDataManager.getValidatorForProvider(provider);
      if (!validateAuthData) {
        throw new Parse.Error(Parse.Error.UNSUPPORTED_SERVICE,
                              'This authentication method is unsupported.');
      };
      return validateAuthData(authData[provider]);
    });
    return Promise.all(validations);
  }
  
  RestWrite.prototype.findUsersWithAuthData = function(authData) {
    let providers = Object.keys(authData);
    let query = providers.reduce((memo, provider) => {
      if (!authData[provider]) {
        return memo;
      }
      let queryKey = `authData.${provider}.id`;
      let query = {};
      query[queryKey] = authData[provider].id;
      memo.push(query);
      return memo;
    }, []).filter((q) => {
      return typeof q !== undefined;
    });
  
    let findPromise = Promise.resolve([]);
    if (query.length > 0) {
       findPromise = this.config.database.find(
          this.className,
          {'$or': query}, {})
    }
  
    return findPromise;
  }
  
  
  RestWrite.prototype.handleAuthData = function(authData) {
    let results;
    return this.handleAuthDataValidation(authData).then(() => {
       return this.findUsersWithAuthData(authData);
    }).then((r) => {
      results = r;
      if (results.length > 1) {
        // More than 1 user with the passed id's
        throw new Parse.Error(Parse.Error.ACCOUNT_ALREADY_LINKED,
                                'this auth is already used');
      }
  
      this.storage['authProvider'] = Object.keys(authData).join(',');
  
      if (results.length > 0) {
        if (!this.query) {
          // Login with auth data
          // Short circuit
          delete results[0].password;
          // need to set the objectId first otherwise location has trailing undefined
          this.data.objectId = results[0].objectId;
          this.response = {
            response: results[0],
            location: this.location()
          };
        } else if (this.query && this.query.objectId) {
          // Trying to update auth data but users
          // are different
          if (results[0].objectId !== this.query.objectId) {
            throw new Parse.Error(Parse.Error.ACCOUNT_ALREADY_LINKED,
                                'this auth is already used');
          }
        }
      }
      return Promise.resolve();
    });
  }
  
  // The non-third-party parts of User transformation
  RestWrite.prototype.transformUser = function() {
    if (this.className !== '_User') {
      return;
    }
  
    var promise = Promise.resolve();
  
    // If we're updating a _User object, clear the user cache for the session
    if (this.query && this.auth.user && this.auth.user.getSessionToken()) {
      cache.users.remove(this.auth.user.getSessionToken());
    }
  
    return promise.then(() => {
      // Transform the password
      if (!this.data.password) {
        return;
      }
      if (this.query && !this.auth.isMaster ) {
        this.storage['clearSessions'] = true;
      }
      return passwordCrypto.hash(this.data.password).then((hashedPassword) => {
        this.data._hashed_password = hashedPassword;
        delete this.data.password;
      });
  
    }).then(() => {
      // Check for username uniqueness
      if (!this.data.username) {
        if (!this.query) {
          this.data.username = cryptoUtils.randomString(25);
        }
        return;
      }
      return this.config.database.find(
        this.className, {
          username: this.data.username,
          objectId: {'$ne': this.objectId()}
        }, {limit: 1}).then((results) => {
          if (results.length > 0) {
            throw new Parse.Error(Parse.Error.USERNAME_TAKEN,
                                  'Account already exists for this username');
          }
          return Promise.resolve();
        });
    }).then(() => {
      if (!this.data.email) {
        return;
      }
      // Validate basic email address format
      if (!this.data.email.match(/^.+@.+$/)) {
        throw new Parse.Error(Parse.Error.INVALID_EMAIL_ADDRESS,
                              'Email address format is invalid.');
      }
      // Check for email uniqueness
      return this.config.database.find(
        this.className, {
          email: this.data.email,
          objectId: {'$ne': this.objectId()}
        }, {limit: 1}).then((results) => {
          if (results.length > 0) {
            throw new Parse.Error(Parse.Error.EMAIL_TAKEN,
                                  'Account already exists for this email ' +
                                  'address');
          }
          return Promise.resolve();
        }).then(() => {
          // We updated the email, send a new validation
          this.storage['sendVerificationEmail'] = true;
          this.config.userController.setEmailVerifyToken(this.data);
          return Promise.resolve();
        })
    });
  };
  
  RestWrite.prototype.createSessionTokenIfNeeded = function() {
    if (this.className !== '_User') {
      return;
    }
    if (this.query) {
      return;
    }
    var token = 'r:' + cryptoUtils.newToken();
  
    var expiresAt = this.config.generateSessionExpiresAt();
    var sessionData = {
      sessionToken: token,
      user: {
        __type: 'Pointer',
        className: '_User',
        objectId: this.objectId()
      },
      createdWith: {
        'action': 'signup',
        'authProvider': this.storage['authProvider'] || 'password'
      },
      restricted: false,
      installationId: this.auth.installationId,
      expiresAt: Parse._encode(expiresAt)
    };
    if (this.response && this.response.response) {
      this.response.response.sessionToken = token;
    }
    var create = new RestWrite(this.config, Auth.master(this.config),
                                   '_Session', null, sessionData);
    return create.execute();
  }
  
  // Handles any followup logic
  RestWrite.prototype.handleFollowup = function() {
    if (this.storage && this.storage['clearSessions'] && this.config.revokeSessionOnPasswordReset) {
      var sessionQuery = {
        user: {
            __type: 'Pointer',
            className: '_User',
            objectId: this.objectId()
          }
      };
      delete this.storage['clearSessions'];
      this.config.database.destroy('_Session', sessionQuery)
      .then(this.handleFollowup.bind(this));
    }
  
    if (this.storage && this.storage['sendVerificationEmail']) {
      delete this.storage['sendVerificationEmail'];
      // Fire and forget!
      this.config.userController.sendVerificationEmail(this.data);
      this.handleFollowup.bind(this);
    }
  };
  
  // Handles the _Role class specialness.
  // Does nothing if this isn't a role object.
  RestWrite.prototype.handleRole = function() {
    if (this.response || this.className !== '_Role') {
      return;
    }
  
    if (!this.auth.user && !this.auth.isMaster) {
      throw new Parse.Error(Parse.Error.INVALID_SESSION_TOKEN,
                            'Session token required.');
    }
  
    if (!this.data.name) {
      throw new Parse.Error(Parse.Error.INVALID_ROLE_NAME,
                            'Invalid role name.');
    }
  };
  
  // Handles the _Session class specialness.
  // Does nothing if this isn't an installation object.
  RestWrite.prototype.handleSession = function() {
    if (this.response || this.className !== '_Session') {
      return;
    }
  
    if (!this.auth.user && !this.auth.isMaster) {
      throw new Parse.Error(Parse.Error.INVALID_SESSION_TOKEN,
                            'Session token required.');
    }
  
    // TODO: Verify proper error to throw
    if (this.data.ACL) {
      throw new Parse.Error(Parse.Error.INVALID_KEY_NAME, 'Cannot set ' +
                            'ACL on a Session.');
    }
  
    if (!this.query && !this.auth.isMaster) {
      var token = 'r:' + cryptoUtils.newToken();
      var expiresAt = this.config.generateSessionExpiresAt();
      var sessionData = {
        sessionToken: token,
        user: {
          __type: 'Pointer',
          className: '_User',
          objectId: this.auth.user.id
        },
        createdWith: {
          'action': 'create'
        },
        restricted: true,
        expiresAt: Parse._encode(expiresAt)
      };
      for (var key in this.data) {
        if (key == 'objectId') {
          continue;
        }
        sessionData[key] = this.data[key];
      }
      var create = new RestWrite(this.config, Auth.master(this.config),
                                 '_Session', null, sessionData);
      return create.execute().then((results) => {
        if (!results.response) {
          throw new Parse.Error(Parse.Error.INTERNAL_SERVER_ERROR,
                                'Error creating session.');
        }
        sessionData['objectId'] = results.response['objectId'];
        this.response = {
          status: 201,
          location: results.location,
          response: sessionData
        };
      });
    }
  };
  
  // Handles the _Installation class specialness.
  // Does nothing if this isn't an installation object.
  // If an installation is found, this can mutate this.query and turn a create
  // into an update.
  // Returns a promise for when we're done if it can't finish this tick.
  RestWrite.prototype.handleInstallation = function() {
    if (this.response || this.className !== '_Installation') {
      return;
    }
  
    if (!this.query && !this.data.deviceToken && !this.data.installationId) {
      throw new Parse.Error(135,
                            'at least one ID field (deviceToken, installationId) ' +
                            'must be specified in this operation');
    }
  
    if (!this.query && !this.data.deviceType) {
      throw new Parse.Error(135,
                            'deviceType must be specified in this operation');
    }
  
    // If the device token is 64 characters long, we assume it is for iOS
    // and lowercase it.
    if (this.data.deviceToken && this.data.deviceToken.length == 64) {
      this.data.deviceToken = this.data.deviceToken.toLowerCase();
    }
  
    // TODO: We may need installationId from headers, plumb through Auth?
    //       per installation_handler.go
  
    // We lowercase the installationId if present
    if (this.data.installationId) {
      this.data.installationId = this.data.installationId.toLowerCase();
    }
  
    var promise = Promise.resolve();
  
    var idMatch; // Will be a match on either objectId or installationId
    var deviceTokenMatches = [];
  
    if (this.query && this.query.objectId) {
      promise = promise.then(() => {
        return this.config.database.find('_Installation', {
          objectId: this.query.objectId
        }, {}).then((results) => {
          if (!results.length) {
            throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND,
                                  'Object not found for update.');
          }
          idMatch = results[0];
          if (this.data.installationId && idMatch.installationId &&
            this.data.installationId !== idMatch.installationId) {
            throw new Parse.Error(136,
                                  'installationId may not be changed in this ' +
                                  'operation');
          }
          if (this.data.deviceToken && idMatch.deviceToken &&
            this.data.deviceToken !== idMatch.deviceToken &&
            !this.data.installationId && !idMatch.installationId) {
            throw new Parse.Error(136,
                                  'deviceToken may not be changed in this ' +
                                  'operation');
          }
          if (this.data.deviceType && this.data.deviceType &&
            this.data.deviceType !== idMatch.deviceType) {
            throw new Parse.Error(136,
                                  'deviceType may not be changed in this ' +
                                  'operation');
          }
          return Promise.resolve();
        });
      });
    }
  
    // Check if we already have installations for the installationId/deviceToken
    promise = promise.then(() => {
      if (this.data.installationId) {
        return this.config.database.find('_Installation', {
          'installationId': this.data.installationId
        });
      }
      return Promise.resolve([]);
    }).then((results) => {
      if (results && results.length) {
        // We only take the first match by installationId
        idMatch = results[0];
      }
      if (this.data.deviceToken) {
        return this.config.database.find(
          '_Installation',
          {'deviceToken': this.data.deviceToken});
      }
      return Promise.resolve([]);
    }).then((results) => {
      if (results) {
        deviceTokenMatches = results;
      }
      if (!idMatch) {
        if (!deviceTokenMatches.length) {
          return;
        } else if (deviceTokenMatches.length == 1 &&
          (!deviceTokenMatches[0]['installationId'] || !this.data.installationId)
        ) {
          // Single match on device token but none on installationId, and either
          // the passed object or the match is missing an installationId, so we
          // can just return the match.
          return deviceTokenMatches[0]['objectId'];
        } else if (!this.data.installationId) {
          throw new Parse.Error(132,
                                'Must specify installationId when deviceToken ' +
                                'matches multiple Installation objects');
        } else {
          // Multiple device token matches and we specified an installation ID,
          // or a single match where both the passed and matching objects have
          // an installation ID. Try cleaning out old installations that match
          // the deviceToken, and return nil to signal that a new object should
          // be created.
          var delQuery = {
            'deviceToken': this.data.deviceToken,
            'installationId': {
              '$ne': this.data.installationId
            }
          };
          if (this.data.appIdentifier) {
            delQuery['appIdentifier'] = this.data.appIdentifier;
          }
          this.config.database.destroy('_Installation', delQuery);
          return;
        }
      } else {
        if (deviceTokenMatches.length == 1 &&
          !deviceTokenMatches[0]['installationId']) {
          // Exactly one device token match and it doesn't have an installation
          // ID. This is the one case where we want to merge with the existing
          // object.
          var delQuery = {objectId: idMatch.objectId};
          return this.config.database.destroy('_Installation', delQuery)
            .then(() => {
              return deviceTokenMatches[0]['objectId'];
            });
        } else {
          if (this.data.deviceToken &&
            idMatch.deviceToken != this.data.deviceToken) {
            // We're setting the device token on an existing installation, so
            // we should try cleaning out old installations that match this
            // device token.
            var delQuery = {
              'deviceToken': this.data.deviceToken,
            };
            // We have a unique install Id, use that to preserve
            // the interesting installation
            if (this.data.installationId) {
              delQuery['installationId'] = {
                '$ne': this.data.installationId
              }
            } else if (idMatch.objectId && this.data.objectId
                      && idMatch.objectId == this.data.objectId) {
              // we passed an objectId, preserve that instalation
              delQuery['objectId'] = {
                '$ne': idMatch.objectId
              }
            } else {
              // What to do here? can't really clean up everything...
              return idMatch.objectId;
            }
            if (this.data.appIdentifier) {
              delQuery['appIdentifier'] = this.data.appIdentifier;
            }
            this.config.database.destroy('_Installation', delQuery);
          }
          // In non-merge scenarios, just return the installation match id
          return idMatch.objectId;
        }
      }
    }).then((objId) => {
      if (objId) {
        this.query = {objectId: objId};
        delete this.data.objectId;
        delete this.data.createdAt;
      }
      // TODO: Validate ops (add/remove on channels, $inc on badge, etc.)
    });
    return promise;
  };
  
  // If we short-circuted the object response - then we need to make sure we expand all the files,
  // since this might not have a query, meaning it won't return the full result back.
  // TODO: (nlutsenko) This should die when we move to per-class based controllers on _Session/_User
  RestWrite.prototype.expandFilesForExistingObjects = function() {
    // Check whether we have a short-circuited response - only then run expansion.
    if (this.response && this.response.response) {
      this.config.filesController.expandFilesInObject(this.config, this.response.response);
    }
  };
  
  RestWrite.prototype.runDatabaseOperation = function() {
    if (this.response) {
      return;
    }
  
    if (this.className === '_User' &&
        this.query &&
        !this.auth.couldUpdateUserId(this.query.objectId)) {
      throw new Parse.Error(Parse.Error.SESSION_MISSING,
                            'cannot modify user ' + this.query.objectId);
    }
  
    if (this.className === '_Product' && this.data.download) {
      this.data.downloadName = this.data.download.name;
    }
  
    // TODO: Add better detection for ACL, ensuring a user can't be locked from
    //       their own user record.
    if (this.data.ACL && this.data.ACL['*unresolved']) {
      throw new Parse.Error(Parse.Error.INVALID_ACL, 'Invalid ACL.');
    }
  
    if (this.query) {
      // Force the user to not lockout
      // Matched with parse.com
      if (this.className === '_User' && this.data.ACL) {
        this.data.ACL[this.query.objectId] = { read: true, write: true };
      }
      // Run an update
      return this.config.database.update(
        this.className, this.query, this.data, this.runOptions).then((resp) => {
          resp.updatedAt = this.updatedAt;
          if (this.storage['changedByTrigger']) {
            resp = Object.keys(this.data).reduce((memo, key) => {
              memo[key] = resp[key] || this.data[key];
              return memo;
            }, resp);
          }
          this.response = {
            response: resp
          };
        });
    } else {
      // Set the default ACL for the new _User
      if (this.className === '_User') {
        var ACL = this.data.ACL;
        // default public r/w ACL
        if (!ACL) {
          ACL = {};
          ACL['*'] = { read: true, write: false };
        }
        // make sure the user is not locked down
        ACL[this.data.objectId] = { read: true, write: true };
        this.data.ACL = ACL;
      }
  
      // Run a create
      return this.config.database.create(this.className, this.data, this.runOptions)
        .then((resp) => {
          Object.assign(resp, {
            objectId: this.data.objectId,
            createdAt: this.data.createdAt
          });
          if (this.storage['changedByTrigger']) {
            resp = Object.keys(this.data).reduce((memo, key) => {
              memo[key] = resp[key] || this.data[key];
              return memo;
            }, resp);
          }
          this.response = {
            status: 201,
            response: resp,
            location: this.location()
          };
        });
    }
  };
  
  // Returns nothing - doesn't wait for the trigger.
  RestWrite.prototype.runAfterTrigger = function() {
    if (!this.response || !this.response.response) {
      return;
    }
  
    // Avoid doing any setup for triggers if there is no 'afterSave' trigger for this class.
    let hasAfterSaveHook = triggers.triggerExists(this.className, triggers.Types.afterSave, this.config.applicationId);
    let hasLiveQuery = this.config.liveQueryController.hasLiveQuery(this.className);
    if (!hasAfterSaveHook && !hasLiveQuery) {
      return Promise.resolve();
    }
  
    var extraData = {className: this.className};
    if (this.query && this.query.objectId) {
      extraData.objectId = this.query.objectId;
    }
  
    // Build the original object, we only do this for a update write.
    let originalObject;
    if (this.query && this.query.objectId) {
      originalObject = triggers.inflate(extraData, this.originalData);
    }
  
    // Build the inflated object, different from beforeSave, originalData is not empty
    // since developers can change data in the beforeSave.
    let updatedObject = triggers.inflate(extraData, this.originalData);
    updatedObject.set(this.sanitizedData());
    updatedObject._handleSaveResponse(this.response.response, this.response.status || 200);
  
    // Notifiy LiveQueryServer if possible
    this.config.liveQueryController.onAfterSave(updatedObject.className, updatedObject, originalObject);
  
    // Run afterSave trigger
    triggers.maybeRunTrigger(triggers.Types.afterSave, this.auth, updatedObject, originalObject, this.config);
  };
  
  // A helper to figure out what location this operation happens at.
  RestWrite.prototype.location = function() {
    var middle = (this.className === '_User' ? '/users/' :
                  '/classes/' + this.className + '/');
    return this.config.mount + middle + this.data.objectId;
  };
  
  // A helper to get the object id for this operation.
  // Because it could be either on the query or on the data
  RestWrite.prototype.objectId = function() {
    return this.data.objectId || this.query.objectId;
  };
  
  // Returns a copy of the data and delete bad keys (_auth_data, _hashed_password...)
  RestWrite.prototype.sanitizedData = function() {
    let data = Object.keys(this.data).reduce((data, key) => {
      // Regexp comes from Parse.Object.prototype.validate
      if (!(/^[A-Za-z][0-9A-Za-z_]*$/).test(key)) {
        delete data[key];
      }
      return data;
    }, deepcopy(this.data));
    return Parse._decode(undefined, data);
  }
  
  RestWrite.prototype.cleanUserAuthData = function() {
    if (this.response && this.response.response && this.className === '_User') {
      let user = this.response.response;
      if (user.authData) {
        Object.keys(user.authData).forEach((provider) => {
          if (user.authData[provider] === null) {
            delete user.authData[provider];
          }
        });
        if (Object.keys(user.authData).length == 0) {
          delete user.authData;
        }
      }
    }
  };
  
  export default RestWrite;
  module.exports = RestWrite;
  