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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.aliyuncs.auth;

/**
 * Created by haowei.yao on 2017/9/28.
 */

public abstract class Signer {

    private final static Signer hmacSHA1Signer = new HmacSHA1Signer();
    private final static Signer sha256withRSASigner = new SHA256withRSASigner();
    private final static Signer bearerTokenSigner = new BearerTokenSigner();

    public abstract String signString(String stringToSign, AlibabaCloudCredentials credentials);
    public abstract String signString(String stringToSign, String accessKeySecret);
    public abstract String getSignerName();
    public abstract String getSignerVersion();
    public abstract String getSignerType();

    public static Signer getSigner(AlibabaCloudCredentials credentials) {
        if (credentials instanceof KeyPairCredentials){
            return sha256withRSASigner;
        } else if (credentials instanceof BearerTokenCredentials) {
            return bearerTokenSigner;
        } else {
            return hmacSHA1Signer;
        }
    }
}