package org.springframework.security.oauth2.provider.code;
   
   import org.springframework.security.oauth2.common.exceptions.InvalidGrantException;
   import org.springframework.security.oauth2.common.util.RandomValueStringGenerator;
   import org.springframework.security.oauth2.provider.OAuth2Authentication;
   
   /**
    * Base implementation for authorization code services that generates a random-value authorization code.
    * 
   * @author Ryan Heaton
   * @author Dave Syer
   */
  public abstract class RandomValueAuthorizationCodeServices implements AuthorizationCodeServices {
  
  	private RandomValueStringGeneratoril/RandomValueStringGenerator.html#RandomValueStringGenerator">RandomValueStringGenerator generator = new RandomValueStringGenerator();
  
  	protected abstract void store(String code, OAuth2Authentication authentication);
  
  	protected abstract OAuth2Authentication remove(String code);
  
  	public String createAuthorizationCode(OAuth2Authentication authentication) {
  		String code = generator.generate();
  		store(code, authentication);
  		return code;
  	}
  
  	public OAuth2Authentication consumeAuthorizationCode(String code)
  			throws InvalidGrantException {
  		OAuth2Authentication auth = this.remove(code);
  		if (auth == null) {
  			throw new InvalidGrantException("Invalid authorization code: " + code);
  		}
  		return auth;
  	}
  
  }