Java Code Examples for com.google.appengine.api.users.User#getUserId()

/**
 * Returns a list of Conferences that the user created.
 * In order to receive the websafeConferenceKey via the JSON params, uses a POST method.
 *
 * @param user A user who invokes this method, null when the user is not signed in.
 * @return a list of Conferences that the user created.
 * @throws UnauthorizedException when the user is not signed in.
 */
@ApiMethod(
        name = "getConferencesCreated",
        path = "getConferencesCreated",
        httpMethod = HttpMethod.POST
)
public List<Conference> getConferencesCreated(final User user) throws UnauthorizedException {
    // If not signed in, throw a 401 error.
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }
    String userId = user.getUserId();
    Key<Profile> userKey = Key.create(Profile.class, userId);
    return ofy().load().type(Conference.class)
            .ancestor(userKey)
            .order("name").list();
}
 

/**
 * Returns a list of Conferences that the user created.
 * In order to receive the websafeConferenceKey via the JSON params, uses a POST method.
 *
 * @param user A user who invokes this method, null when the user is not signed in.
 * @return a list of Conferences that the user created.
 * @throws UnauthorizedException when the user is not signed in.
 */
@ApiMethod(
        name = "getConferencesCreated",
        path = "getConferencesCreated",
        httpMethod = HttpMethod.POST
)
public List<Conference> getConferencesCreated(final User user) throws UnauthorizedException {
    // If not signed in, throw a 401 error.
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }
    String userId = user.getUserId();
    Key<Profile> userKey = Key.create(Profile.class, userId);
    return ofy().load().type(Conference.class)
            .ancestor(userKey)
            .order("name").list();
}
 

@Test
public void testSuccess_linkedToContactEmail() {
  // Even though the user is [email protected] the contact is still Marla Singer
  user = new User("[email protected]", "gmail.com", user.getUserId());
  authResult = AuthResult.create(AuthLevel.USER, UserAuthInfo.create(user, false));
  action =
      new RegistryLockGetAction(
          Method.GET, response, accessor, authResult, Optional.of("TheRegistrar"));
  action.run();
  assertThat(GSON.fromJson(response.getPayload(), Map.class).get("results"))
      .isEqualTo(
          ImmutableList.of(
              ImmutableMap.of(
                  "lockEnabledForContact",
                  true,
                  "email",
                  "[email protected]",
                  "clientId",
                  "TheRegistrar",
                  "locks",
                  ImmutableList.of())));
}
 

/**
 * Validate inputs of SkillResponse.
 *
 * @param skill inputs to be validate
 * @param user info about user from google
 *
 * @throws BadRequestException for the validations.
 * @throws InternalServerErrorException in case something goes wrong
 * @throws NotFoundException in case the information are not founded
 */
private void validateInputs(Skill skill, User user)
    throws BadRequestException, NotFoundException, InternalServerErrorException {

  log.info("Validating inputs of skill");

  if (user == null || user.getUserId() == null || user.getUserId().isEmpty()) {
    throw new BadRequestException(ValidationMessageEnums.USER_GOOGLE_ENDPOINT_NULL.message());
  }

  final TechGalleryUser techUser = userService.getUserByGoogleId(user.getUserId());
  if (techUser == null) {
    throw new BadRequestException(ValidationMessageEnums.USER_NOT_EXIST.message());
  }

  if (skill == null) {
    throw new BadRequestException(ValidationMessageEnums.SKILL_CANNOT_BLANK.message());
  }

  if (skill.getValue() == null || skill.getValue() < 0 || skill.getValue() > 5) {
    throw new BadRequestException(ValidationMessageEnums.SKILL_RANGE.message());
  }

  if (skill.getTechnology() == null) {
    throw new BadRequestException(ValidationMessageEnums.TECHNOLOGY_ID_CANNOT_BLANK.message());
  }

}
 

/**
 * Gets the Profile entity for the current user
 * or creates it if it doesn't exist
 * @param user
 * @return user's Profile
 */
private static Profile getProfileFromUser(User user) {
    // First fetch the user's Profile from the datastore.
    Profile profile = ofy().load().key(
            Key.create(Profile.class, user.getUserId())).now();
    if (profile == null) {
        // Create a new Profile if it doesn't exist.
        // Use default displayName and teeShirtSize
        String email = user.getEmail();
        profile = new Profile(user.getUserId(),
                extractDefaultDisplayNameFromEmail(email), email, TeeShirtSize.NOT_SPECIFIED);
    }
    return profile;
}
 

/**
 * Returns a Profile object associated with the given user object. The cloud
 * endpoints system automatically inject the User object.
 *
 * @param user
 *            A User object injected by the cloud endpoints.
 * @return Profile object.
 * @throws UnauthorizedException
 *             when the User object is null.
 */
@ApiMethod(name = "getProfile", path = "profile", httpMethod = HttpMethod.GET)
public Profile getProfile(final User user) throws UnauthorizedException {
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }

    // TODO
    // load the Profile Entity
    String userId = user.getUserId();
    Key key = Key.create(Profile.class, userId);

    Profile profile = (Profile) ofy().load().key(key).now();
    return profile;
}
 

/**
 * This is an ugly workaround for null userId for Android clients.
 *
 * @param user A User object injected by the cloud endpoints.
 * @return the App Engine userId for the user.
 */
private static String getUserId(User user) {
    String userId = user.getUserId();
    if (userId == null) {
        LOG.info("userId is null, so trying to obtain it from the datastore.");
        AppEngineUser appEngineUser = new AppEngineUser(user);
        ofy().save().entity(appEngineUser).now();
        // Begin new session for not using session cache.
        Objectify objectify = ofy().factory().begin();
        AppEngineUser savedUser = objectify.load().key(appEngineUser.getKey()).now();
        userId = savedUser.getUser().getUserId();
        LOG.info("Obtained the userId: " + userId);
    }
    return userId;
}
 

/**
 * Return the user id for the currently logged in user.
 */
static final String getUserId() {
  UserService userService = UserServiceFactory.getUserService();
  User loggedIn = userService.getCurrentUser();
  Preconditions.checkState(loggedIn != null, "This servlet requires the user to be logged in.");
  return loggedIn.getUserId();
}
 

@Override
public TechGalleryUser validateUser(User user)
    throws BadRequestException, NotFoundException, InternalServerErrorException {

  if (user == null || user.getUserId() == null || user.getUserId().isEmpty()) {
    throw new BadRequestException(ValidationMessageEnums.USER_GOOGLE_ENDPOINT_NULL.message());
  }

  final TechGalleryUser techUser = getUserByGoogleId(user.getUserId());
  if (techUser == null) {
    throw new NotFoundException(ValidationMessageEnums.USER_NOT_EXIST.message());
  }
  return techUser;
}
 

/**
 * Validate the user logged in.
 *
 * @param user info about user from google
 * @throws InternalServerErrorException in case something goes wrong
 * @throws NotFoundException            in case the information are not founded
 * @throws BadRequestException          in case a request with problem were made.
 */
private void validateUser(User user) throws BadRequestException, NotFoundException, InternalServerErrorException {

    if (user == null || user.getUserId() == null || user.getUserId().isEmpty()) {
        throw new BadRequestException(ValidationMessageEnums.USER_GOOGLE_ENDPOINT_NULL.message());
    }

    TechGalleryUser techUser = userService.getUserByGoogleId(user.getUserId());
    if (techUser == null) {
        throw new NotFoundException(ValidationMessageEnums.USER_NOT_EXIST.message());
    }
}
 

/**
 * Validate the user logged in.
 *
 * @param user info about user from google
 *
 * @throws BadRequestException in case a request with problem were made.
 * @throws InternalServerErrorException in case something goes wrong
 * @throws NotFoundException in case the information are not founded
 */
private void validateUser(User user)
    throws BadRequestException, NotFoundException, InternalServerErrorException {

  log.info("Validating user to link");

  if (user == null || user.getUserId() == null || user.getUserId().isEmpty()) {
    throw new BadRequestException(ValidationMessageEnums.USER_GOOGLE_ENDPOINT_NULL.message());
  }

  final TechGalleryUser techUser = userService.getUserByGoogleId(user.getUserId());
  if (techUser == null) {
    throw new NotFoundException(ValidationMessageEnums.USER_NOT_EXIST.message());
  }
}
 

/**
 * Validate the user logged in.
 *
 * @param user info about user from google
 * @throws InternalServerErrorException in case something goes wrong
 * @throws NotFoundException in case the information are not founded
 * @throws BadRequestException in case a request with problem were made.
 */
private void validateUser(User user)
    throws BadRequestException, NotFoundException, InternalServerErrorException {

  if (user == null || user.getUserId() == null || user.getUserId().isEmpty()) {
    throw new BadRequestException(ValidationMessageEnums.USER_GOOGLE_ENDPOINT_NULL.message());
  }

  final TechGalleryUser techUser = userService.getUserByGoogleId(user.getUserId());
  if (techUser == null) {
    throw new NotFoundException(ValidationMessageEnums.USER_NOT_EXIST.message());
  }
}
 

/**
 * Returns a Profile object associated with the given user object. The cloud
 * endpoints system automatically inject the User object.
 *
 * @param user
 *            A User object injected by the cloud endpoints.
 * @return Profile object.
 * @throws UnauthorizedException
 *             when the User object is null.
 */
@ApiMethod(name = "getProfile", path = "profile", httpMethod = HttpMethod.GET)
public Profile getProfile(final User user) throws UnauthorizedException {
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }

    // TODO
    // load the Profile Entity
    String userId = user.getUserId();
    Key key = Key.create(Profile.class, userId);

    Profile profile = (Profile) ofy().load().key(key).now();
    return profile;
}
 

/**
 * Validation for User.
 *
 * @author <a href="mailto:[email protected]"> João Felipe de Medeiros Moreira </a>
 * @since 28/09/2015
 *
 * @param user to be validated
 * @param techUser to be validated
 *
 * @throws BadRequestException in case the params are not correct
 * @throws InternalServerErrorException in case of internal error
 */
private void validateUser(User user, TechGalleryUser techUser)
    throws BadRequestException, InternalServerErrorException {
  log.info("Validating user to recommend");

  if (user == null || user.getUserId() == null || user.getUserId().isEmpty()) {
    throw new BadRequestException(ValidationMessageEnums.USER_GOOGLE_ENDPOINT_NULL.message());
  }

  if (techUser == null) {
    throw new BadRequestException(ValidationMessageEnums.USER_NOT_EXIST.message());
  }
}
 

/**
 * Register to attend the specified Conference.
 *
 * @param user An user who invokes this method, null when the user is not signed in.
 * @param websafeConferenceKey The String representation of the Conference Key.
 * @return Boolean true when success, otherwise false
 * @throws UnauthorizedException when the user is not signed in.
 * @throws NotFoundException when there is no Conference with the given conferenceId.
 */
@ApiMethod(
        name = "registerForConference",
        path = "conference/{websafeConferenceKey}/registration",
        httpMethod = HttpMethod.POST
)

public WrappedBoolean registerForConference(final User user,
        @Named("websafeConferenceKey") final String websafeConferenceKey)
        throws UnauthorizedException, NotFoundException,
        ForbiddenException, ConflictException {
    // If not signed in, throw a 401 error.
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }

    // Get the userId
    final String userId = user.getUserId();

    WrappedBoolean result = ofy().transact(new Work<WrappedBoolean>() {
        @Override
        public WrappedBoolean run() {
            try {

            // Get the conference key
            // Will throw ForbiddenException if the key cannot be created
            Key<Conference> conferenceKey = Key.create(websafeConferenceKey);

            // Get the Conference entity from the datastore
            Conference conference = ofy().load().key(conferenceKey).now();

            // 404 when there is no Conference with the given conferenceId.
            if (conference == null) {
                return new WrappedBoolean (false,
                        "No Conference found with key: "
                                + websafeConferenceKey);
            }

            // Get the user's Profile entity
            Profile profile = getProfileFromUser(user);

            // Has the user already registered to attend this conference?
            if (profile.getConferenceKeysToAttend().contains(
                    websafeConferenceKey)) {
                return new WrappedBoolean (false, "Already registered");
            } else if (conference.getSeatsAvailable() <= 0) {
                return new WrappedBoolean (false, "No seats available");
            } else {
                // All looks good, go ahead and book the seat
                profile.addToConferenceKeysToAttend(websafeConferenceKey);
                conference.bookSeats(1);

                // Save the Conference and Profile entities
                ofy().save().entities(profile, conference).now();
                // We are booked!
                return new WrappedBoolean(true, "Registration successful");
            }

            }
            catch (Exception e) {
                return new WrappedBoolean(false, "Unknown exception");

            }
        }
    });
    // if result is false
    if (!result.getResult()) {
        if (result.getReason().contains("No Conference found with key")) {
            throw new NotFoundException (result.getReason());
        }
        else if (result.getReason() == "Already registered") {
            throw new ConflictException("You have already registered");
        }
        else if (result.getReason() == "No seats available") {
            throw new ConflictException("There are no seats available");
        }
        else {
            throw new ForbiddenException("Unknown exception");
        }
    }
    return result;
}
 

/**
 * POST for adding a endorsement. TODO: Refactor - Extract Method. Same in
 * {@link #addOrUpdateEndorsement(EndorsementResponse, User)}
 *
 * @throws InternalServerErrorException in case something goes wrong
 * @throws NotFoundException in case the information are not founded
 * @throws BadRequestException in case a request with problem were made.
 * @throws OAuthRequestException in case of authentication problem
 */
@Override
public Endorsement addOrUpdateEndorsementPlusOne(EndorsementResponse endorsement, User user)
    throws InternalServerErrorException, BadRequestException, NotFoundException,
    OAuthRequestException {
  // endorser user google id
  String googleId;
  // endorser user from techgallery datastore
  TechGalleryUser tgEndorserUser;
  // endorsed user from techgallery datastore
  TechGalleryUser tgEndorsedUser;
  // endorsed email
  String endorsedEmail;
  // technology from techgallery datastore
  Technology technology;

  // User from endpoint (endorser) can't be null
  if (user == null) {
    throw new OAuthRequestException(i18n.t("OAuth error, null user reference!"));
  } else {
    googleId = user.getUserId();
  }

  // TechGalleryUser can't be null and must exists on datastore
  if (googleId == null || googleId.equals("")) {
    throw new NotFoundException(i18n.t("Current user was not found!"));
  } else {
    // get the TechGalleryUser from datastore
    tgEndorserUser = userDao.findByGoogleId(googleId);
    if (tgEndorserUser == null) {
      throw new BadRequestException(i18n.t("Endorser user do not exists on datastore!"));
    }
    tgEndorserUser.setGoogleId(googleId);
  }

  // endorsed email can't be null.
  endorsedEmail = endorsement.getEndorsed();
  if (endorsedEmail == null || endorsedEmail.equals("")) {
    throw new BadRequestException(i18n.t("Endorsed email was not especified!"));
  } else {
    // get user from PEOPLE
    tgEndorsedUser = userService.getUserSyncedWithProvider(endorsedEmail);
    if (tgEndorsedUser == null) {
      throw new BadRequestException(i18n.t("Endorsed email was not found on PEOPLE!"));
    }
  }

  // technology id can't be null and must exists on datastore
  final String technologyId = endorsement.getTechnology();
  if (technologyId == null || technologyId.equals("")) {
    throw new BadRequestException(i18n.t("Technology was not especified!"));
  } else {
    technology = techDao.findById(technologyId);
    if (technology == null) {
      throw new BadRequestException(i18n.t("Technology do not exists!"));
    }
  }

  // final checks and persist
  // user cannot endorse itself
  if (tgEndorserUser.getId().equals(tgEndorsedUser.getId())) {
    throw new BadRequestException(i18n.t("You cannot endorse yourself!"));
  }

  // should exist only one active endorsement per endorser/endorsed/technology. the others are
  // saved for history purpose. if already exist one active endorsement, set to inactive.
  // if not, add a new one as active
  final List<Endorsement> endorsements =
      endorsementDao.findActivesByUsers(tgEndorserUser, tgEndorsedUser, technology);
  if (endorsements.size() == 1) {
    endorsements.get(0).setInactivatedDate(new Date());
    endorsements.get(0).setActive(false);
    endorsementDao.update(endorsements.get(0));

    UserProfileServiceImpl.getInstance().handleEndorsement(endorsements.get(0));
    return getEndorsement(endorsements.get(0).getId());
  } else if (endorsements.size() > 1) {
    throw new BadRequestException(
        i18n.t("More than one active endorserment for the same endorser/endorsed/technology!"));
  }

  // create endorsement and save it
  final Endorsement entity = new Endorsement();
  entity.setEndorser(Ref.create(tgEndorserUser));
  entity.setEndorsed(Ref.create(tgEndorsedUser));
  entity.setTimestamp(new Date());
  entity.setTechnology(Ref.create(technology));
  entity.setActive(true);
  endorsementDao.add(entity);
  UserProfileServiceImpl.getInstance().handleEndorsement(entity);
  return getEndorsement(entity.getId());
}
 

/**
 * Register to attend the specified Conference.
 *
 * @param user An user who invokes this method, null when the user is not signed in.
 * @param websafeConferenceKey The String representation of the Conference Key.
 * @return Boolean true when success, otherwise false
 * @throws UnauthorizedException when the user is not signed in.
 * @throws NotFoundException when there is no Conference with the given conferenceId.
 */
@ApiMethod(
        name = "registerForConference",
        path = "conference/{websafeConferenceKey}/registration",
        httpMethod = HttpMethod.POST
)

public WrappedBoolean registerForConference(final User user,
        @Named("websafeConferenceKey") final String websafeConferenceKey)
        throws UnauthorizedException, NotFoundException,
        ForbiddenException, ConflictException {
    // If not signed in, throw a 401 error.
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }

    // Get the userId
    final String userId = user.getUserId();

    WrappedBoolean result = ofy().transact(new Work<WrappedBoolean>() {
        @Override
        public WrappedBoolean run() {
            try {

            // Get the conference key
            // Will throw ForbiddenException if the key cannot be created
            Key<Conference> conferenceKey = Key.create(websafeConferenceKey);

            // Get the Conference entity from the datastore
            Conference conference = ofy().load().key(conferenceKey).now();

            // 404 when there is no Conference with the given conferenceId.
            if (conference == null) {
                return new WrappedBoolean (false,
                        "No Conference found with key: "
                                + websafeConferenceKey);
            }

            // Get the user's Profile entity
            Profile profile = getProfileFromUser(user);

            // Has the user already registered to attend this conference?
            if (profile.getConferenceKeysToAttend().contains(
                    websafeConferenceKey)) {
                return new WrappedBoolean (false, "Already registered");
            } else if (conference.getSeatsAvailable() <= 0) {
                return new WrappedBoolean (false, "No seats available");
            } else {
                // All looks good, go ahead and book the seat
                profile.addToConferenceKeysToAttend(websafeConferenceKey);
                conference.bookSeats(1);

                // Save the Conference and Profile entities
                ofy().save().entities(profile, conference).now();
                // We are booked!
                return new WrappedBoolean(true, "Registration successful");
            }

            }
            catch (Exception e) {
                return new WrappedBoolean(false, "Unknown exception");

            }
        }
    });
    // if result is false
    if (!result.getResult()) {
        if (result.getReason().contains("No Conference found with key")) {
            throw new NotFoundException (result.getReason());
        }
        else if (result.getReason() == "Already registered") {
            throw new ConflictException("You have already registered");
        }
        else if (result.getReason() == "No seats available") {
            throw new ConflictException("There are no seats available");
        }
        else {
            throw new ForbiddenException("Unknown exception");
        }
    }
    return result;
}
 

/**
 * Creates or updates a Profile object associated with the given user
 * object.
 *
 * @param user
 *            A User object injected by the cloud endpoints.
 * @param profileForm
 *            A ProfileForm object sent from the client form.
 * @return Profile object just created.
 * @throws UnauthorizedException
 *             when the User object is null.
 */

// Declare this method as a method available externally through Endpoints
@ApiMethod(name = "saveProfile", path = "profile", httpMethod = HttpMethod.POST)
// The request that invokes this method should provide data that
// conforms to the fields defined in ProfileForm
// TODO 1 Pass the ProfileForm parameter
// TODO 2 Pass the User parameter
public Profile saveProfile(final User user, ProfileForm profileForm)
        throws UnauthorizedException {

    // TODO 2
    // If the user is not logged in, throw an UnauthorizedException
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }

    // TODO 2
    // Get the userId and mainEmail
    String mainEmail = user.getEmail();
    String userId = user.getUserId();

    // TODO 1
    // Get the displayName and teeShirtSize sent by the request.

    String displayName = profileForm.getDisplayName();
    TeeShirtSize teeShirtSize = profileForm.getTeeShirtSize();

    // Get the Profile from the datastore if it exists
    // otherwise create a new one
    Profile profile = ofy().load().key(Key.create(Profile.class, userId))
            .now();

    if (profile == null) {
        // Populate the displayName and teeShirtSize with default values
        // if not sent in the request
        if (displayName == null) {
            displayName = extractDefaultDisplayNameFromEmail(user
                    .getEmail());
        }
        if (teeShirtSize == null) {
            teeShirtSize = TeeShirtSize.NOT_SPECIFIED;
        }
        // Now create a new Profile entity
        profile = new Profile(userId, displayName, mainEmail, teeShirtSize);
    } else {
        // The Profile entity already exists
        // Update the Profile entity
        profile.update(displayName, teeShirtSize);
    }

    // TODO 3
    // Save the entity in the datastore
    ofy().save().entity(profile).now();

    // Return the profile
    return profile;
}
 

/**
 * Creates a new Conference object and stores it to the datastore.
 *
 * @param user A user who invokes this method, null when the user is not signed in.
 * @param conferenceForm A ConferenceForm object representing user's inputs.
 * @return A newly created Conference Object.
 * @throws UnauthorizedException when the user is not signed in.
 */
@ApiMethod(name = "createConference", path = "conference", httpMethod = HttpMethod.POST)
public Conference createConference(final User user, final ConferenceForm conferenceForm)
    throws UnauthorizedException {
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }

    // TODO (Lesson 4)
    // Get the userId of the logged in User
    String userId = user.getUserId();

    // TODO (Lesson 4)
    // Get the key for the User's Profile
    Key<Profile> profileKey = Key.create(Profile.class, userId);

    // TODO (Lesson 4)
    // Allocate a key for the conference -- let App Engine allocate the ID
    // Don't forget to include the parent Profile in the allocated ID
    final Key<Conference> conferenceKey = factory().allocateId(profileKey, Conference.class);

    // TODO (Lesson 4)
    // Get the Conference Id from the Key
    final long conferenceId = conferenceKey.getId();

    // TODO (Lesson 4)
    // Get the existing Profile entity for the current user if there is one
    // Otherwise create a new Profile entity with default values
    Profile profile = getProfileFromUser(user);

    // TODO (Lesson 4)
    // Create a new Conference Entity, specifying the user's Profile entity
    // as the parent of the conference
    Conference conference = new Conference(conferenceId, userId, conferenceForm);

    // TODO (Lesson 4)
    // Save Conference and Profile Entities
     ofy().save().entities(conference, profile).now();

     return conference;
     }
 

/**
 * Creates or updates a Profile object associated with the given user
 * object.
 *
 * @param user
 *            A User object injected by the cloud endpoints.
 * @param profileForm
 *            A ProfileForm object sent from the client form.
 * @return Profile object just created.
 * @throws UnauthorizedException
 *             when the User object is null.
 */

// Declare this method as a method available externally through Endpoints
@ApiMethod(name = "saveProfile", path = "profile", httpMethod = HttpMethod.POST)
// The request that invokes this method should provide data that
// conforms to the fields defined in ProfileForm
// TODO 1 Pass the ProfileForm parameter
// TODO 2 Pass the User parameter
public Profile saveProfile(final User user, ProfileForm profileForm)
        throws UnauthorizedException {

    // TODO 2
    // If the user is not logged in, throw an UnauthorizedException
    if (user == null) {
        throw new UnauthorizedException("Authorization required");
    }

    // TODO 2
    // Get the userId and mainEmail
    String mainEmail = user.getEmail();
    String userId = user.getUserId();

    // TODO 1
    // Get the displayName and teeShirtSize sent by the request.

    String displayName = profileForm.getDisplayName();
    TeeShirtSize teeShirtSize = profileForm.getTeeShirtSize();

    // Get the Profile from the datastore if it exists
    // otherwise create a new one
    Profile profile = ofy().load().key(Key.create(Profile.class, userId))
            .now();

    if (profile == null) {
        // Populate the displayName and teeShirtSize with default values
        // if not sent in the request
        if (displayName == null) {
            displayName = extractDefaultDisplayNameFromEmail(user
                    .getEmail());
        }
        if (teeShirtSize == null) {
            teeShirtSize = TeeShirtSize.NOT_SPECIFIED;
        }
        // Now create a new Profile entity
        profile = new Profile(userId, displayName, mainEmail, teeShirtSize);
    } else {
        // The Profile entity already exists
        // Update the Profile entity
        profile.update(displayName, teeShirtSize);
    }

    // TODO 3
    // Save the entity in the datastore
    ofy().save().entity(profile).now();

    // Return the profile
    return profile;
}