package cn.home1.oss.lib.common.crypto;
   
   import io.jsonwebtoken.SignatureAlgorithm;
   import io.jsonwebtoken.impl.TextCodec;
   
   import lombok.Getter;
   
   import javax.crypto.SecretKey;
   import javax.crypto.spec.SecretKeySpec;
  
  /**
   * Created by zhanghaolun on 16/11/17.
   */
  public class JwtKey {
  
    @Getter
    private final KeyExpression keyExpression;
    @Getter
    private final SignatureAlgorithm signatureAlgorithm;
    @Getter
    private final SecretKey signatureKey;
  
    public JwtKey(final KeyExpression keyExpression) {
      this.keyExpression = keyExpression;
      this.signatureAlgorithm = SignatureAlgorithm.forName(this.keyExpression.getSpec());
      this.signatureKey = new SecretKeySpec( //
        TextCodec.BASE64.decode(this.keyExpression.getValue()), //
        this.signatureAlgorithm.getJcaName() //
      );
    }
  
    public JwtKey(final String keyExpression) {
      this(new KeyExpression(keyExpression));
    }
  }