69 lines
2.3 KiB
C#
69 lines
2.3 KiB
C#
using DNS.Client.RequestResolver;
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using DNS.Protocol;
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using DNS.Protocol.ResourceRecords;
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using FastGithub.Scanner;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Options;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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namespace FastGithub.Dns
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{
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/// <summary>
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/// github相关域名解析器
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/// </summary>
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[Service(ServiceLifetime.Singleton)]
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sealed class GithubRequestResolver : IRequestResolver
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{
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private readonly IGithubScanResults githubScanResults;
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private readonly IOptionsMonitor<DnsOptions> options;
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private readonly ILogger<GithubRequestResolver> logger;
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/// <summary>
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/// github相关域名解析器
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/// </summary>
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/// <param name="githubScanResults"></param>
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/// <param name="options"></param>
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/// <param name="logger"></param>
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public GithubRequestResolver(
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IGithubScanResults githubScanResults,
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IOptionsMonitor<DnsOptions> options,
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ILogger<GithubRequestResolver> logger)
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{
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this.githubScanResults = githubScanResults;
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this.options = options;
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this.logger = logger;
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}
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/// <summary>
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/// 解析域名
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/// </summary>
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/// <param name="request"></param>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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public Task<IResponse> Resolve(IRequest request, CancellationToken cancellationToken = default)
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{
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var response = Response.FromRequest(request);
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var question = request.Questions.FirstOrDefault();
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if (question != null && question.Type == RecordType.A)
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{
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var domain = question.Name.ToString();
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var address = this.githubScanResults.FindBestAddress(domain);
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if (address != null)
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{
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var ttl = this.options.CurrentValue.GithubTTL;
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var record = new IPAddressResourceRecord(question.Name, address, ttl);
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response.AnswerRecords.Add(record);
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this.logger.LogInformation(record.ToString());
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}
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}
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return Task.FromResult<IResponse>(response);
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}
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}
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}
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