C# 简单的百度推送代码

前段时间搞推送来着，安卓方面用到了百度的推送服务，由于只是简单的用到安卓推送的通知功能，所以没用百度推荐的C# SDK，通过借鉴网上的各种资料和百度的API，费了老大劲终于折腾出来一段能用的代码（早知道这么纠结，直接用别人的了。。。强迫症伤不起啊）

2016-2-17在2.0基础上修改的3.0（百度巨坑，接口文档写的稀烂，文档上也不写明sign签名MD5需要小写，就为了这个问题我抓狂了3天）

最新3.0的

public class BaiduPush
    {
        private const string url = "http://api.tuisong.baidu.com/rest/3.0/push/single_device";
        private const string apikey = "XXXXXXXXXXXXXXXXXX";
        private const string secret_key = "XXXXXXXXXXXXXXXXXXXXXXXXXX";

        /// <summary>
        /// 只简单实现单个设备通知功能
        /// </summary>
        /// <param name="channel_id"></param>
        /// <param name="msg"></param>
        /// <param name="type"></param>
        public static void Send(string channel_id, string msg, string type)
        {
            WebClient webClient = new WebClient();
            webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
            webClient.Headers.Add("User-Agent", "BCCS_SDK/3.0 (Darwin; Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64; x86_64) PHP/5.6.3 (Baidu Push Server SDK V3.0.0 and so on..) cli/Unknown ZEND/2.6.0");
            try
            {
                byte[] response = webClient.UploadData(url, "POST", StructData(channel_id, msg, type));
                var ss = Encoding.UTF8.GetString(response, 0, response.Length);
            }
            catch (WebException ex)
            {
                Stream stream = ex.Response.GetResponseStream();
                byte[] bs = new byte[1024];
                int index = 0;
                int b;
                while ((b = stream.ReadByte()) > 0)
                {
                    bs[index++] = (byte)b;
                }
                stream.Close();
                var ss = Encoding.UTF8.GetString(bs, 0, index);
            }
        }
        /// <summary>
        /// 构建Data
        /// </summary>
        /// <param name="token"></param>
        /// <param name="msg"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        private static byte[] StructData(string channel_id, string msg, string type)
        {
            DateTime utcNow = DateTime.UtcNow;
            DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0);
            uint timestamp = (uint)(utcNow - epoch).TotalSeconds;
            uint expires = (uint)(utcNow.AddDays(1) - epoch).TotalSeconds; //一天后过期

            Dictionary<string, string> dic = new Dictionary<string, string>();
            dic.Add("apikey", apikey);
            dic.Add("timestamp", timestamp.ToString());
            dic.Add("expires", expires.ToString());
            dic.Add("device_type", "3");  //3：android 4：iOS

            dic.Add("channel_id", channel_id);
            dic.Add("msg_type", "1");  //取值如下：0：消息；1：通知。默认为0
            dic.Add("msg", "{\"title\":\"hello\",\"description\":\"" + msg + "\",\"custom_content\":{\"ClassName\":\"igs.android.healthsleep.MainActivity\",\"PushMessageType\":" + type + "}}");

            dic.Add("sign", StructSign("POST", url, dic, secret_key));

            StringBuilder sb = new StringBuilder();
            foreach (var d in dic)
            {
                sb.Append(d.Key + "=" + d.Value + "&");
            }
            sb.Remove(sb.Length - 1, 1);
            return Encoding.UTF8.GetBytes(sb.ToString());
        }
        /// <summary>
        /// 构建Sign
        /// </summary>
        /// <param name="httpMethod"></param>
        /// <param name="url"></param>
        /// <param name="dic"></param>
        /// <param name="secret_key"></param>
        /// <returns></returns>
        private static string StructSign(string httpMethod, string url, Dictionary<string, string> dic, string secret_key)
        {
            //按key正序
            dic = dic.OrderBy(p => p.Key).ToDictionary(p => p.Key, p => p.Value);
            StringBuilder sb = new StringBuilder();
            //构建键值对
            foreach (var d in dic)
            {
                sb.Append(d.Key + "=" + d.Value);
            }
            string sign = httpMethod + url + sb + secret_key;
            //url编码
            sign = sign.UrlEncode();
            //将编码后替换的字符大写，这地方是个坑。。。文档里根本没说明
            char[] cs = new char[sign.Length];
            for (int i = 0; i < sign.Length; i++)
            {
                cs[i] = sign[i];
                if (sign[i] == '%')
                {
                    cs[++i] = Convert.ToChar(sign[i].ToString().ToUpper());
                    cs[++i] = Convert.ToChar(sign[i].ToString().ToUpper());
                }
            }
            //MD5加密
            return new string(cs).MD5().ToLower(); //巨坑，sign原来要小写，接口文档里根本就没有说明。。。
        }
    }
    /// <summary>
    /// 用到的扩展方法
    /// </summary>
    public static class ExtendMethod
    {
        /// <summary>
        /// MD5加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string MD5(this string str)
        {
            byte[] bs = new MD5CryptoServiceProvider().ComputeHash(Encoding.UTF8.GetBytes(str));
            return BitConverter.ToString(bs).Replace("-", "");
        }
        /// <summary>
        /// url编码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string UrlEncode(this string str)
        {
            str = System.Web.HttpUtility.UrlEncode(str, Encoding.UTF8);
            /*
             * 不知道为什么微软要把空格编码为+，浏览器不认识啊
             * 只能在这里手动替换下了
             * */
            return str.Replace("+", "%20");
        }
    }

　　

以前2.0的

/// <summary>
    /// 百度推送
    /// </summary>
    public class BaiduPush
    {
        private const string method = "push_msg";
        private const string url = "https://channel.api.duapp.com/rest/2.0/channel/channel";
        private const string apikey = "xxxxxxxxxxxxxxxxx";
        private const string secret_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxx";

        public static string Push(string user_id, string title, string description, string msg_keys)
        {
            DateTime utcNow = DateTime.UtcNow;
            DateTime epoch = new DateTime(, , , , , );
            uint timestamp = (uint)(utcNow - epoch).TotalSeconds;
            uint expires = (uint)(utcNow.AddDays() - epoch).TotalSeconds; //一天后过期

            Dictionary<string, string> dic = new Dictionary<string, string>();
            dic.Add("method", method);
            dic.Add("apikey", apikey);
            dic.Add("timestamp", timestamp.ToString());
            dic.Add("expires", expires.ToString());
            dic.Add("push_type", ""); //单播
            dic.Add("device_type", ""); //Andriod设备
            dic.Add("user_id", user_id);
            dic.Add("message_type", ""); //只发通知
            dic.Add("messages", "{\"title\":\"" + title + "\",\"description\":\"" + description + "\"}");
            dic.Add("msg_keys", msg_keys); //消息标识 相同消息标识的消息会自动覆盖。只支持android。
            dic.Add("sign", StructSign("POST", url, dic, secret_key));

            StringBuilder sb = new StringBuilder();
            foreach (var d in dic)
            {
                sb.Append(d.Key + "=" + d.Value + "&");
            }
            sb.Remove(sb.Length - , );
            byte[] data = Encoding.UTF8.GetBytes(sb.ToString());

            WebClient webClient = new WebClient();
            try
            {
                webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");//采取POST方式必须加的header，如果改为GET方式的话就去掉这句话即可
                byte[] response = webClient.UploadData(url, "POST", data);
                return Encoding.UTF8.GetString(response);
            }
            catch (WebException ex)
            {
                Stream stream = ex.Response.GetResponseStream();
                byte[] bs = new byte[];
                int i = ;
                int b;
                while ((b = stream.ReadByte()) > )
                {
                    bs[i++] = (byte)b;
                }
                stream.Close();
                return Encoding.UTF8.GetString(bs, , i);
            }
        }
        /// <summary>
        /// 构建Sign
        /// </summary>
        /// <param name="httpMethod"></param>
        /// <param name="url"></param>
        /// <param name="dic"></param>
        /// <param name="secret_key"></param>
        /// <returns></returns>
        private static string StructSign(string httpMethod, string url, Dictionary<string, string> dic, string secret_key)
        {
            //按key正序
            dic = dic.OrderBy(p => p.Key).ToDictionary(p => p.Key, p => p.Value);
            StringBuilder sb = new StringBuilder();
            //构建键值对
            foreach (var d in dic)
            {
                sb.Append(d.Key + "=" + d.Value);
            }
            string sign = httpMethod + url + sb + secret_key;
            //url编码
            sign = sign.UrlEncode();
            //将编码后替换的字符大写，这地方是个坑。。。
            char[] cs = new char[sign.Length];
            for (int i = ; i < sign.Length; i++)
            {
                cs[i] = sign[i];
                if (sign[i] == '%')
                {
                    cs[++i] = Convert.ToChar(sign[i].ToString().ToUpper());
                    cs[++i] = Convert.ToChar(sign[i].ToString().ToUpper());
                }
            }
            //MD5加密
            return new string(cs).MD5();
        }
    }

外加两个扩展方法

System.Web.HttpUtility.UrlEncode需要添加引用System.Web （.net framework 4.0 client profile下面找不到System.Web请切换到.net framework 4.0）

/// <summary>
        /// MD5加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string MD5(this string str)
        {
            byte[] bs = new MD5CryptoServiceProvider().ComputeHash(Encoding.UTF8.GetBytes(str));
            return BitConverter.ToString(bs).Replace("-", "");
        }
        /// <summary>
        /// url编码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string UrlEncode(this string str)
        {
            return System.Web.HttpUtility.UrlEncode(str, Encoding.UTF8);
        }