Permission.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2020 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.security;
 
import java.util.function.Supplier;
import org.turro.elephant.context.Application;
import org.turro.plugin.contacts.IContact;
 
public class Permission {
  
  private final IContact contact;
  private final String[] roles;
  private final Supplier<Boolean> supplier;
 
  private Permission(IContact contact, String... roles) {
    this.contact = contact;
    this.roles = roles;
    this.supplier = null;
  }
  
  private Permission(IContact contact, Supplier<Boolean> supplier) {
    this.contact = contact;
    this.supplier = supplier;
    this.roles = null;
  }
  
  public boolean check() {
    if(roles != null) {
      for(String role : roles) {
        if(role.contains(":")) {
          if(isInRole(role)) {
            return true;
          }
        } else {
          if(hasAnyRoleKey(role)) {
            return true;
          }
        }
      }
    }
    if(supplier != null) {
      return supplier.get();
    }
    return false;
  }
  
  private boolean isInRole(String role) {
    return contact != null || contact.isValid() ? 
            contact.isInRole(role) : false;
  }
 
  private boolean hasAnyRoleKey(String role) {
    return contact != null || contact.isValid() ? 
            contact.hasAnyRoleKey(role) : false;
  }
  
  /* Factory */
  
  public static Permission from(String... roles) {
    return new Permission(Application.getUser(), roles);
  }
  
  public static Permission from(Supplier<Boolean> supplier) {
    return new Permission(Application.getUser(), supplier);
  }
 
  public static Permission from(IContact contact, String... roles) {
    return new Permission(contact, roles);
  }
  
  public static Permission from(IContact contact, Supplier<Boolean> supplier) {
    return new Permission(contact, supplier);
  }
 
}