source: phonelux-backend/src/main/java/finki/it/phoneluxbackend/entities/User.java

package finki.it.phoneluxbackend.entities;

import com.fasterxml.jackson.annotation.JsonIgnore;
import finki.it.phoneluxbackend.data.UserRole;
import lombok.*;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

@Getter
@Setter
@ToString
@EqualsAndHashCode
@NoArgsConstructor
@AllArgsConstructor
@Entity(name = "User")
@Table(name = "users")
public class User implements UserDetails {

    @SequenceGenerator(
            name = "user_sequence",
            sequenceName = "user_sequence",
            allocationSize = 1
    )
    @Id
    @GeneratedValue(
            strategy = GenerationType.SEQUENCE,
            generator = "user_sequence"
    )
    private Long id;
    private String firstName;
    private String lastName;
    private String email;
    private String password;
    @Enumerated(EnumType.STRING)
    private UserRole userRole;
    private Boolean locked = false;
    private Boolean enabled = false;

    @ManyToMany
    @JoinTable(
            name = "users_favourite_offers",
            joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "offer_id")
    )
    @JsonIgnore
    private List<PhoneOffer> favouriteOffers = new ArrayList<PhoneOffer>();

    private String specifications;

    public User(String firstName, String lastName, String email, String password, UserRole userRole) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
        this.password = password;
        this.userRole = userRole;
    }

    public User(Long id, String firstName, UserRole userRole) {
        this.id = id;
        this.firstName = firstName;
        this.userRole = userRole;
    }


    public User(Long id, String firstName, String lastName, String email, UserRole userRole) {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
        this.userRole = userRole;
    }

    public User(String firstName, String lastName, String email, UserRole userRole) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
        this.userRole = userRole;
    }

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        SimpleGrantedAuthority authority = new SimpleGrantedAuthority(userRole.name());
        return Collections.singletonList(authority);
    }

    @Override
    public String getPassword() {
        return password;
    }

    @Override
    public String getUsername() {
        return email;
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return !locked;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return enabled;
    }
}