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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;

import java.util.HashMap;
import java.util.Map;

import com.aliyuncs.http.FormatType;
import com.aliyuncs.http.MethodType;
import com.aliyuncs.utils.ParameterHelper;

public class OssSignatureComposer extends RoaSignatureComposer {
    private static ISignatureComposer composer = null;

    @Override
    public Map refreshSignParameters(Map parameters,
                                                     Signer signer, String accessKeyId, FormatType format) {
        Map immutableMap = new HashMap(parameters);
        immutableMap.put("Date", ParameterHelper.getRFC2616Date(null));
        return immutableMap;
    }

    private String buildQueryString(String uri, Map queries) {
        StringBuilder queryBuilder = new StringBuilder(uri);
        if (0 < queries.size()) { queryBuilder.append("?"); }
        for (Map.Entry e : queries.entrySet()) {
            queryBuilder.append(e.getKey());
            if (null != e.getValue()) { queryBuilder.append("=").append(e.getValue()); }
            queryBuilder.append(QUERY_SEPARATOR);
        }
        String queryString = queryBuilder.toString();
        if (queryString.endsWith(QUERY_SEPARATOR)) { queryString = queryString.substring(0, queryString.length() - 1); }

        return queryString;
    }

    @Override
    public String composeStringToSign(MethodType method, String uriPattern,
                                      Signer signer, Map queries,
                                      Map headers, Map paths) {
        StringBuilder sb = new StringBuilder();
        sb.append(method).append(HEADER_SEPARATOR);
        if (headers.get("Content-MD5") != null) {
            sb.append(headers.get("Content-MD5"));
        }
        sb.append(HEADER_SEPARATOR);
        if (headers.get("Content-Type") != null) {
            sb.append(headers.get("Content-Type"));
        }
        sb.append(HEADER_SEPARATOR);
        if (headers.get("Date") != null) {
            sb.append(headers.get("Date"));
        }
        sb.append(HEADER_SEPARATOR);
        sb.append(buildCanonicalHeaders(headers, "x-oss-"));
        sb.append(buildQueryString(uriPattern, queries));
        return sb.toString();
    }

    public static ISignatureComposer getComposer() {
        if (null == composer) { composer = new OssSignatureComposer(); }
        return composer;
    }
}