20 lines
661 B
C#
20 lines
661 B
C#
using System.Net;
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namespace w4c_workflows.Services.Security;
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/// <summary>
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/// Resolves a host name to the addresses a request could actually reach.
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/// Abstracted so the egress guard can be unit-tested without touching DNS.
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/// </summary>
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public interface IHostAddressResolver
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{
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Task<IReadOnlyList<IPAddress>> ResolveAsync(string host, CancellationToken ct);
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}
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/// <summary>Production resolver backed by <see cref="Dns"/>.</summary>
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public sealed class DnsHostAddressResolver : IHostAddressResolver
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{
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public async Task<IReadOnlyList<IPAddress>> ResolveAsync(string host, CancellationToken ct)
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=> await Dns.GetHostAddressesAsync(host, ct);
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}
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