package com.atlassian.asap.service.core.service;
   
   import com.atlassian.asap.api.client.http.AuthorizationHeaderGenerator;
   import com.atlassian.asap.core.keys.KeyProvider;
   import com.atlassian.asap.core.keys.publickey.PublicKeyProviderFactory;
   import com.atlassian.asap.core.validator.JwtClaimsValidator;
   import com.atlassian.asap.service.api.AsapService;
   import com.atlassian.asap.service.api.AuthorizationBuilder;
   import com.atlassian.asap.service.api.TokenValidator;
  import com.atlassian.asap.service.core.impl.AuthorizationBuilderImpl;
  import com.atlassian.asap.service.core.impl.TokenValidatorImpl;
  import com.atlassian.asap.service.core.spi.AsapConfiguration;
  
  import java.security.PublicKey;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A default implementation for {@code AsapService} that takes its settings from an {@code AsapConfiguration}.
   */
  public class DefaultAsapService implements AsapService {
      private final AsapConfiguration config;
      private final JwtClaimsValidator jwtClaimsValidator;
      private final KeyProvider<PublicKey> publicKeyProvider;
      private final AuthorizationHeaderGenerator authorizationHeaderGenerator;
  
      @SuppressWarnings("unused")
      public DefaultAsapService(AsapConfiguration config,
                                JwtClaimsValidator jwtClaimsValidator,
                                PublicKeyProviderFactory publicKeyProviderFactory,
                                AuthorizationHeaderGenerator authorizationHeaderGenerator) {
          this(config, jwtClaimsValidator, createPublicKeyProvider(config, publicKeyProviderFactory), authorizationHeaderGenerator);
      }
  
      @SuppressWarnings("WeakerAccess")
      protected DefaultAsapService(AsapConfiguration config,
                                   JwtClaimsValidator jwtClaimsValidator,
                                   KeyProvider<PublicKey> publicKeyProvider,
                                   AuthorizationHeaderGenerator authorizationHeaderGenerator) {
          this.config = requireNonNull(config, "config");
          this.jwtClaimsValidator = requireNonNull(jwtClaimsValidator, "jwtClaimsValidator");
          this.publicKeyProvider = requireNonNull(publicKeyProvider, "publicKeyProvider");
          this.authorizationHeaderGenerator = requireNonNull(authorizationHeaderGenerator, "authorizationHeaderGenerator");
      }
  
      @Override
      public AuthorizationBuilder authorizationBuilder() {
          return new AuthorizationBuilderImpl(config, authorizationHeaderGenerator);
      }
  
      @Override
      public TokenValidator tokenValidator() {
          return new TokenValidatorImpl(config, publicKeyProvider, jwtClaimsValidator);
      }
  
      private static KeyProvider<PublicKey> createPublicKeyProvider(AsapConfiguration config,
                                                                    PublicKeyProviderFactory publicKeyProviderFactory) {
          requireNonNull(config, "config");
          requireNonNull(publicKeyProviderFactory, "publicKeyProviderFactory");
          return publicKeyProviderFactory.createPublicKeyProvider(config.publicKeyRepositoryUrl());
      }
  }