93 lines
3.9 KiB
C#
93 lines
3.9 KiB
C#
using Microsoft.Extensions.Options;
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using System.Globalization;
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using System.Security.Cryptography;
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using System.Text;
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namespace ZeroFramework.IdentityServer.API.Infrastructure.Aliyun
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{
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/// <summary>
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/// The Alibaba Cloud SDK for .NET allows you to access Alibaba Cloud services such as Elastic Compute Service (ECS), Server Load Balancer (SLB), CloudMonitor, etc.
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/// You can access Alibaba Cloud services without the need to handle API related tasks, such as signing and constructing your requests.
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/// https://github.com/aliyun/aliyun-openapi-net-sdk
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/// </summary>
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public class AliyunAuthHandler(IOptions<AlibabaCloudOptions> alibabaCloudOptionsAccessor) : DelegatingHandler
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{
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private readonly AlibabaCloudOptions _alibabaCloudOptions = alibabaCloudOptionsAccessor.Value;
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protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
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{
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Dictionary<string, string?> parameters = new()
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{
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{ "SignatureMethod", "HMAC-SHA1" },
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{ "SignatureNonce", Guid.NewGuid().ToString() },
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{ "SignatureVersion", "1.0" },
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{ "AccessKeyId", _alibabaCloudOptions.AccessKeyId },
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{ "Timestamp", DateTime.Now.ToUniversalTime().ToString("o") },
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{ "Format", "JSON" }
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};
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foreach (var property in request.Options)
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{
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if (property.Value is not null)
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{
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var type = property.Value.GetType();
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bool isPrimitiveType = type.IsPrimitive || type.IsValueType || (type == typeof(string));
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string? propertyValue = isPrimitiveType ? property.Value.ToString() : System.Text.Json.JsonSerializer.Serialize(property.Value);
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parameters[property.Key] = propertyValue;
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}
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}
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var sortedDictionary = new SortedDictionary<string, string?>(parameters, StringComparer.Ordinal);
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StringBuilder canonicalizedQueryString = new();
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foreach (var p in sortedDictionary)
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{
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if (p.Value is not null)
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{
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canonicalizedQueryString.Append('&').Append(PercentEncode(p.Key)).Append('=').Append(PercentEncode(p.Value));
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}
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}
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StringBuilder stringToSign = new();
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stringToSign.Append(request.Method).Append('&').Append(PercentEncode("/")).Append('&');
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stringToSign.Append(PercentEncode(canonicalizedQueryString.ToString()[1..]));
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string signature = string.Empty;
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using (var hmac = new HMACSHA1(Encoding.UTF8.GetBytes(_alibabaCloudOptions.AccessKeySecret + "&")))
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{
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var hashValue = hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign.ToString()));
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signature = Convert.ToBase64String(hashValue);
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}
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signature = PercentEncode(signature);
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request.RequestUri = new Uri($"{request.RequestUri?.Scheme}://{request.RequestUri?.Host}/?Signature={signature}{canonicalizedQueryString}");
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return await base.SendAsync(request, cancellationToken);
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}
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private static string PercentEncode(string value)
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{
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StringBuilder stringBuilder = new();
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string text = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";
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byte[] bytes = Encoding.UTF8.GetBytes(value);
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foreach (char c in bytes)
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{
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if (text.Contains(c))
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{
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stringBuilder.Append(c);
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}
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else
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{
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stringBuilder.Append('%').Append(string.Format(CultureInfo.InvariantCulture, "{0:X2}", (int)c));
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}
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}
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return stringBuilder.ToString();
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}
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}
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}
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