V3手动鉴权失败之C#篇

using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;
using System.Net;
using System.IO; // for StreamReader

namespace V3Test
{
    class Program
    {
        public static string SHA256Hex(string s)
        {
            using (SHA256 algo = SHA256.Create())
            {
                byte[] hashbytes = algo.ComputeHash(Encoding.UTF8.GetBytes(s));
                StringBuilder builder = new StringBuilder();
                for (int i = 0; i < hashbytes.Length; ++i)
                {
                    builder.Append(hashbytes[i].ToString("x2"));
                }
                return builder.ToString();
            }
        }
        public static byte[] HmacSHA256(byte[] key, byte[] msg)
        {
            using (HMACSHA256 mac = new HMACSHA256(key))
            {
                return mac.ComputeHash(msg);
            }
        }
        public static Dictionary<String, String> BuildHeaders(string secretid,
        string secretkey, string service, string endpoint, string region,
        string action, string version, DateTime date, string requestPayload)
        {
            string datestr = date.ToString("yyyy-MM-dd");
            Console.WriteLine(datestr);

            DateTime startTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
            long requestTimestamp = (long)Math.Round((date - startTime).TotalMilliseconds, MidpointRounding.AwayFromZero) / 1000;
            Console.WriteLine(requestTimestamp);
            // ************* 步骤 1：拼接规范请求串 *************
            string algorithm = "TC3-HMAC-SHA256";
            string httpRequestMethod = "POST";
            string canonicalUri = "/";
            string canonicalQueryString = "";
            string contentType = "application/json";
            string canonicalHeaders = "content-type:" + contentType + "; charset=utf-8\n" + "host:" + endpoint + "\n";
            string signedHeaders = "content-type;host";
            string hashedRequestPayload = SHA256Hex(requestPayload);
            string canonicalRequest = httpRequestMethod + "\n"
                + canonicalUri + "\n"
                + canonicalQueryString + "\n"
                + canonicalHeaders + "\n"
                + signedHeaders + "\n"
                + hashedRequestPayload;
            Console.WriteLine(canonicalRequest);
            Console.WriteLine("----------------------------------");

            // ************* 步骤 2：拼接待签名字符串 *************
            string credentialScope = datestr + "/" + service + "/" + "tc3_request";
            string hashedCanonicalRequest = SHA256Hex(canonicalRequest);
            string stringToSign = algorithm + "\n" + requestTimestamp.ToString() + "\n" + credentialScope + "\n" + hashedCanonicalRequest;
            Console.WriteLine(stringToSign);
            Console.WriteLine("----------------------------------");

            // ************* 步骤 3：计算签名 *************
            byte[] tc3SecretKey = Encoding.UTF8.GetBytes("TC3" + secretkey);
            byte[] secretDate = HmacSHA256(tc3SecretKey, Encoding.UTF8.GetBytes(datestr));
            byte[] secretService = HmacSHA256(secretDate, Encoding.UTF8.GetBytes(service));
            byte[] secretSigning = HmacSHA256(secretService, Encoding.UTF8.GetBytes("tc3_request"));
            byte[] signatureBytes = HmacSHA256(secretSigning, Encoding.UTF8.GetBytes(stringToSign));
            string signature = BitConverter.ToString(signatureBytes).Replace("-", "").ToLower();
            Console.WriteLine(signature);
            Console.WriteLine("----------------------------------");

            // ************* 步骤 4：拼接 Authorization *************
            string authorization = algorithm + " "
                + "Credential=" + secretid + "/" + credentialScope + ", "
                + "SignedHeaders=" + signedHeaders + ", "
                + "Signature=" + signature;
            Console.WriteLine(authorization);
            Console.WriteLine("----------------------------------");

            Dictionary<string, string> headers = new Dictionary<string, string>();
            headers.Add("Authorization", authorization);
            headers.Add("Host", endpoint);
            headers.Add("Content-Type", contentType + "; charset=utf-8");
            headers.Add("X-TC-Timestamp", requestTimestamp.ToString());
            headers.Add("X-TC-Version", version);
            headers.Add("X-TC-Action", action);
            headers.Add("X-TC-Region", region);
            return headers;
        }
        static void Main(string[] args)
        {
            // 密钥参数
            string SECRET_ID = "xxx";//输入自己的secretId
            string SECRET_KEY = "xxx";//输入自己的secretKey

            string service = "iai";
            string endpoint = "iai.tencentcloudapi.com";
            string region = "ap-guangzhou";
            string action = "DetectFace";
            string version = "2020-03-03";

            // 此处由于示例规范的原因，采用时间戳2019-02-26 00:44:25，此参数作为示例，如果在项目中，您应当使用：
            // DateTime date = DateTime.UtcNow;
            // 注意时区，建议此时间统一采用UTC时间戳，否则容易出错


            DateTime date = DateTime.UtcNow;
            Console.WriteLine(date);
            string requestPayload = "{\"Url\": \"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1601296547571&di=2152789b1c2c00459485f2bc57181c94&imgtype=0&src=http%3A%2F%2F5b0988e595225.cdn.sohucs.com%2Fimages%2F20180811%2Fefb2c10f038b4749b5a3669f34f26e2c.jpeg\"}";

            Dictionary<string, string> headers = BuildHeaders(SECRET_ID, SECRET_KEY, service
                , endpoint, region, action, version, date, requestPayload);

            Console.WriteLine("POST https://iai.tencentcloudapi.com");

            Console.WriteLine();
            Console.WriteLine(requestPayload);

            var request = (HttpWebRequest)WebRequest.Create("https://iai.tencentcloudapi.com");

            var data = Encoding.UTF8.GetBytes(requestPayload);
            request.Method = "POST";
            //request.ContentType = "application/json";

            foreach (KeyValuePair<string, string> kv in headers)
            {
                //Console.WriteLine(kv.Key + ": " + kv.Value);
                request.Headers.Add(kv.Key, kv.Value);
            }

            request.ContentLength = data.Length;
            using (var stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }
            var response = (HttpWebResponse)request.GetResponse();
            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
            Console.WriteLine(responseString);
        }
    }
}