UserDTO adapt for Auth0 User in JHipster

UserDTO.java

package com.seelix.api.service.dto;

import java.time.Instant;
import java.util.ArrayList;
import java.util.Set;
import java.util.stream.Collectors;

import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

import com.auth0.json.mgmt.users.User;
import com.seelix.api.config.Constants;
import com.seelix.api.service.Auth0ManagementApiService;

/**
 * A DTO representing a user, with his authorities.
 */
public class UserDTO {

	private String id;

	@NotBlank
	@Pattern(regexp = Constants.LOGIN_REGEX)
	@Size(min = 1, max = 50)
	private String login;

	@Size(max = 50)
	private String firstName;

	@Size(max = 50)
	private String lastName;

	@Email
	@Size(min = 5, max = 100)
	private String email;

	@Size(max = 256)
	private String imageUrl;

	private boolean activated = false;

	@Size(min = 2, max = 6)
	private String langKey;

	private Instant createdDate;

	private Instant lastModifiedDate;

	private Set<String> authorities;

	public UserDTO() {
		// Empty constructor needed for Jackson.
	}

	@SuppressWarnings("unchecked")
	public UserDTO(User user) {
		this.id = user.getId();
		this.login = user.getUsername();
		if (user.getUserMetadata() != null
				&& user.getUserMetadata().get(Auth0ManagementApiService.GIVEN_NAME) != null) {
			this.firstName = (@Size(max = 50) String) user.getUserMetadata().get(Auth0ManagementApiService.GIVEN_NAME);
		} else {
			this.firstName = user.getGivenName();
		}
		if (user.getUserMetadata() != null
				&& user.getUserMetadata().get(Auth0ManagementApiService.FAMILY_NAME) != null) {
			this.lastName = (@Size(max = 50) String) user.getUserMetadata().get(Auth0ManagementApiService.FAMILY_NAME);
		} else {
			this.lastName = user.getFamilyName();
		}
		this.email = user.getEmail();
		boolean activated = true;
		if (user.isBlocked() != null) {
			activated = !user.isBlocked();
		}
		this.activated = activated;
		if (user.getUserMetadata() != null && user.getUserMetadata().get(Auth0ManagementApiService.PIC) != null) {
			this.imageUrl = (@Size(max = 256) String) user.getUserMetadata().get(Auth0ManagementApiService.PIC);
		} else {
			this.imageUrl = user.getPicture();
		}
		if (user.getUserMetadata() != null) {
			this.langKey = (@Size(min = 2, max = 6) String) user.getUserMetadata().get(Auth0ManagementApiService.LANG);
		}
		this.createdDate = user.getCreatedAt().toInstant();
		this.lastModifiedDate = user.getUpdatedAt().toInstant();
		if (user.getAppMetadata() != null) {
			this.authorities = ((ArrayList<String>) user.getAppMetadata().get(Auth0ManagementApiService.ROLES)).stream()
					.collect(Collectors.toSet());
		}
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getLogin() {
		return login;
	}

	public void setLogin(String login) {
		this.login = login;
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getImageUrl() {
		return imageUrl;
	}

	public void setImageUrl(String imageUrl) {
		this.imageUrl = imageUrl;
	}

	public boolean isActivated() {
		return activated;
	}

	public void setActivated(boolean activated) {
		this.activated = activated;
	}

	public String getLangKey() {
		return langKey;
	}

	public void setLangKey(String langKey) {
		this.langKey = langKey;
	}

	public Instant getCreatedDate() {
		return createdDate;
	}

	public void setCreatedDate(Instant createdDate) {
		this.createdDate = createdDate;
	}

	public Instant getLastModifiedDate() {
		return lastModifiedDate;
	}

	public void setLastModifiedDate(Instant lastModifiedDate) {
		this.lastModifiedDate = lastModifiedDate;
	}

	public Set<String> getAuthorities() {
		return authorities;
	}

	public void setAuthorities(Set<String> authorities) {
		this.authorities = authorities;
	}

	@Override
	public String toString() {
		return "UserDTO [id=" + id + ", login=" + login + ", firstName=" + firstName + ", lastName=" + lastName
				+ ", email=" + email + ", imageUrl=" + imageUrl + ", activated=" + activated + ", langKey=" + langKey
				+ ", createdDate=" + createdDate + ", lastModifiedDate=" + lastModifiedDate + ", authorities="
				+ authorities + "]";
	}

}