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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,
			ISigner 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;
	}
	
	public String composeStringToSign(MethodType method, String uriPattern,
			ISigner 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;
	}
}