ParameterHelper.cs

/*
 * 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.
 */

using System;
using System.Web;
using System.Text;
using System.Globalization;
using System.Security.Cryptography;
using System.Collections.Generic;

using Aliyun.Acs.Core.Http;

namespace Aliyun.Acs.Core.Utils
{
    public class ParameterHelper
    {
        private const string ISO8601_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss'Z'";

        public static string FormatIso8601Date(DateTime date)
        {
            return date.ToUniversalTime()
                .ToString(ISO8601_DATE_FORMAT, CultureInfo.CreateSpecificCulture("en-US"));
        }

        public static string GetRFC2616Date(DateTime datetime)
        {
            if (null == datetime)
            {
                datetime = DateTime.UtcNow;
            }

            return datetime.ToUniversalTime().GetDateTimeFormats('r')[0];
        }

        public static string Md5Sum(byte[] buff)
        {
            using (MD5 md5 = new MD5CryptoServiceProvider())
            {
                var output = md5.ComputeHash(buff);
                return BitConverter.ToString(output).Replace("-", "");
            }
        }

        public static string Md5SumAndBase64(byte[] buff)
        {
            using (MD5 md5 = new MD5CryptoServiceProvider())
            {
                var output = md5.ComputeHash(buff);
                // string md5Str = BitConverter.ToString(output).Replace("-", "");

                // System.Text.Encoding encode = System.Text.Encoding.ASCII;
                // byte[] bytedata = System.Text.Encoding.ASCII.GetBytes(md5Str);
                return Convert.ToBase64String(output, 0, output.Length);
            }
        }

        public static string FormatTypeToString(FormatType? formatType)
        {
            if (FormatType.XML == formatType)
            {
                return "application/xml";
            }

            if (FormatType.JSON == formatType)
            {
                return "application/json";
            }

            if (FormatType.FORM == formatType)
            {
                return "application/x-www-form-urlencoded";
            }

            return "application/octet-stream";
        }

        public static FormatType? StingToFormatType(string format)
        {
            if (format.ToLower().Equals("application/xml") || format.ToLower().Equals("text/xml"))
            {
                return FormatType.XML;
            }

            if (format.ToLower().Equals("application/json"))
            {
                return FormatType.JSON;
            }

            if (format.ToLower().Equals("application/x-www-form-urlencoded"))
            {
                return FormatType.FORM;
            }

            return FormatType.RAW;
        }

        public static MethodType? StringToMethodType(string method)
        {
            method = method.ToUpper();
            switch (method)
            {
                case "GET":
                    {
                        return MethodType.GET;
                    }
                case "PUT":
                    {
                        return MethodType.PUT;
                    }
                case "POST":
                    {
                        return MethodType.POST;
                    }
                case "DELETE":
                    {
                        return MethodType.DELETE;
                    }
                case "HEAD":
                    {
                        return MethodType.HEAD;
                    }
                case "OPTIONS":
                    {
                        return MethodType.OPTIONS;
                    }
                default:
                    {
                        return null;
                    }
            }
        }

        public static byte[] GetFormData(Dictionary<string, string> parameters)
        {
            var result = new StringBuilder();
            var first = true;

            foreach (var entry in parameters)
            {
                if (string.IsNullOrEmpty(entry.Value))
                {
                    continue;
                }
                if (first)
                {
                    first = false;
                }
                else
                {
                    result.Append("&");
                }
                result.Append(HttpUtility.UrlEncode(entry.Key));
                result.Append("=");
                result.Append(HttpUtility.UrlEncode(entry.Value));
            }
            return Encoding.UTF8.GetBytes(result.ToString());
        }


        public static string ValidateEnvNotNull(string obj, string envVariableName, string paramName, string message)
        {
            if (obj == null)
            {
                if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable(envVariableName)))
                {
                    throw new ArgumentNullException(paramName, message);
                }
                else
                {
                    return Environment.GetEnvironmentVariable(envVariableName);
                }
            }
            return obj;
        }
    }
}