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阿里云短信服務怎么弄(如何接入阿里云短信服務 (完整指南))

2021-12-13 08:44

短信發送是軟件開發中的一個常見功能,在國內常用于基于短信驗證碼的用戶注冊、找回密碼和操作授權等場景。[阿里云短信服務怎么弄(如何接入阿里云短信服務 (完整指南))]。阿里云的短信服務在調用時需要實現一個不是那么容易的簽名算法,但如果只是為了發送短信這一個功能就去引用其提供的 SDK 顯得非常不經濟。同時該 SDK 并未對 .NET 5 進行適配,編譯時會提示警告信息:

warning NU1701: 已使用“.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8”而不是項目目標框架“.NETStandard,Version=v2.0”還原包“BouncyCastle 1.8.6.1”。此包可能與項目不完全兼容。

為了解決上述問題,筆者參照其 SDK 實現了一個簡潔版的 AliSmsSender :僅包含短信發送功能,無需依賴阿里云的 SDK ,僅需要一個文件。

public class AliSmsSender
{
    private static readonly HashSet<char> TextTable =
        new HashSet<char>("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~");

    private static readonly HttpClient HttpClient = new HttpClient();

    public AliSmsSender(string accessKeyId, string accessKeySecret, string signName)
    {
        if (string.IsNullOrWhiteSpace(accessKeyId))
        {
            throw new ArgumentNullException(nameof(accessKeyId));
        }

        if (string.IsNullOrWhiteSpace(accessKeySecret))
        {
            throw new ArgumentNullException(nameof(accessKeySecret));
        }

        if (string.IsNullOrWhiteSpace(signName))
        {
            throw new ArgumentNullException(nameof(signName));
        }

        AccessKeyId = accessKeyId;
        AccessKeySecret = accessKeySecret;
        SignName = signName;
    }

    public string AccessKeyId { get; }
    public string AccessKeySecret { get; }
    public string SignName { get; }

    public async Task<SendSmsResponse> SendAsync(string phone, string templateCode, object param)
    {
        var dictionary = new SortedDictionary<string, string>(StringComparer.Ordinal)
        {
            {"AccessKeyId", AccessKeyId},
            {"Action", "SendSms"},
            {"Format", "JSON"},
            {"PhoneNumbers", phone},
            {"SignatureMethod", "HMAC-SHA1"},
            {"SignatureNonce", Guid.NewGuid().ToString()},
            {"SignatureVersion", "1.0"},
            {"SignName", SignName},
            {"TemplateCode", templateCode},
            {"TemplateParam", JsonConvert.SerializeObject(param)},
            {"Timestamp", GetTimeStamp()},
            {"Version", "2017-05-25"}
        };
        var source = ComposeStringToSign("POST", dictionary);
        var value = SignString(source, AccessKeySecret + "&");
        dictionary.Add("Signature", value);
        using (var request = new HttpRequestMessage(
                HttpMethod.Post,
                "http://dysmsapi.aliyuncs.com"
            )
            {
                Content = new FormUrlEncodedContent(dictionary)
            }
        )
        {
            using (var response = await HttpClient.SendAsync(request))
            {
                var json = await response.Content.ReadAsStringAsync();
                return JsonConvert.DeserializeObject<SendSmsResponse>(json);
            }
        }
    }

    private string SignString(string source, string accessSecret)
    {
        string result;
        using (var keyedHashAlgorithm = KeyedHashAlgorithm.Create("HMACSHA1"))
        {
            keyedHashAlgorithm.Key = Encoding.UTF8.GetBytes(accessSecret.ToCharArray());
            result = Convert.ToBase64String(
                keyedHashAlgorithm.ComputeHash(
                    Encoding.UTF8.GetBytes(
                        source.ToCharArray()
                    )
                )
            );
        }

        return result;
    }

    private string ComposeStringToSign(string method, IEnumerable<KeyValuePair<string, string>> items)
    {
        var data = ComposeStringToSign(items);
        return $"{method}&{PercentEncode("/")}&{PercentEncode(data)}";
    }

    private string ComposeStringToSign(IEnumerable<KeyValuePair<string, string>> items)
    {
        var builder = new StringBuilder();
        foreach (var item in items)
        {
            builder.Append(PercentEncode(item.Key))
                .Append('=')
                .Append(PercentEncode(item.Value))
                .Append('&');
        }

        if (builder.Length > 0)
        {
            builder.Length--;
        }

        return builder.ToString();
    }

    private string GetTimeStamp()
    {
        return DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ", DateTimeFormatInfo.InvariantInfo);
    }

    private string PercentEncode(string value)
    {
        var stringBuilder = new StringBuilder();
        var bytes = Encoding.UTF8.GetBytes(value);
        foreach (var b in bytes)
        {
            var c = (char) b;
            if (TextTable.Contains(c))
            {
                stringBuilder.Append(c);
            }
            else
            {
                stringBuilder.Append('%')
                    .Append(string.Format(CultureInfo.InvariantCulture, "{0:X2}", (int) c));
            }
        }

        return stringBuilder.ToString();
    }

    public class SendSmsResponse
    {
        [JsonProperty("RequestId")] public string RequestId { get; set; }

        [JsonProperty("Message")] public string Message { get; set; }

        [JsonProperty("BizId")] public string BizId { get; set; }

        [JsonProperty("Code")] public string Code { get; set; }
    }
}

該實現依賴 Newtonsoft.Json 做 Json 反序列化,同時需要引入以下命名空間:

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;

使用時,先用阿里云提供的訪問密鑰及簽名信息構造 AliSmsSender 的實例,并調用其 SendAsync 方法即可:

var sender = new AliSmsSender("accessKeyId", "accessKeySecret", "簽名");
var result = await sender.SendAsync("13888888888", "模板Code", new { arg = "模板參數值" });
if (result.Code == "OK")
{
    Console.WriteLine("發送成功");
}
else
{
    Console.WriteLine("發送失敗:{0}", result.Code);
}

以上代碼也可以在 GitHub 上獲得,查看地址:

https://gist.github.com/Soar360/18b9fea0ad08e5068e1e072ee4a21aa9




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