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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.aliyun.odps.account;

import com.aliyun.odps.account.Account.AccountProvider;
import com.aliyun.odps.commons.transport.Headers;
import com.aliyun.odps.commons.transport.Request;
import com.aliyun.odps.utils.StringUtils;
import java.nio.charset.StandardCharsets;

import org.apache.commons.codec.binary.Base64;

/**
 * @author Jon ([email protected])
 */
public class AppRequestSigner implements RequestSigner {
    private Account account;

    public AppRequestSigner(Account account) {
        this.account = account;
    }

    @Override
    public void sign(String resource, Request req) {
        AccountProvider accountProvider = this.account.getType();
        switch(accountProvider) {
            case ALIYUN:
                // TODO: Case sensitive
                String providerStr = accountProvider.toString().toLowerCase();
                String signature = SecurityUtils.getFormattedSignature(
                    providerStr,
                    ((AliyunAccount) account).getAccessId(),
                    getAliyunSignature(req));
                req.getHeaders().put(Headers.APP_AUTHENTICATION, signature);
                break;
            default:
                throw new IllegalArgumentException(
                    "Unsupported account provider for application account.");
        }
    }

    public String getAliyunSignature(Request request) {
        String strToSign = request.getHeaders().get(Headers.AUTHORIZATION);
        return getAliyunSignature(strToSign);
    }

    public String getAliyunSignature(String strToSign) {
        if (StringUtils.isNullOrEmpty(strToSign)) {
            throw new RuntimeException("String to sign cannot be empty or null.");
        }

        byte[] crypto;
        crypto = SecurityUtils.hmacsha1Signature(
            strToSign.getBytes(StandardCharsets.UTF_8),
            ((AliyunAccount) account).getAccessKey().getBytes());

        return Base64.encodeBase64String(crypto).trim();
    }
}