15f96c408c
Start takes a free slot or overwrites the one expiring first; parallel starts carry the same request cookies, choose the same slot and overwrite each other. Complete finds its attempt by scanning the slots for the posted nonce; an overwritten attempt finds none and is refused like any other. The per-request counting sweep, its byte budget and the nonce-named cookie are deleted. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
521 lines
20 KiB
C#
521 lines
20 KiB
C#
using System.Net;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json;
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using Bifrost.Web.Data;
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using Bifrost.Web.Features.Heimdall;
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using Microsoft.AspNetCore.Hosting;
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using Microsoft.AspNetCore.Mvc.Testing;
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using Microsoft.AspNetCore.WebUtilities;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Configuration;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.DependencyInjection.Extensions;
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using Microsoft.Extensions.Logging;
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using Org.BouncyCastle.Math.EC.Rfc8032;
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namespace Bifrost.Web.Tests.Support;
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/// <summary>An Ed25519 key shaped like Heimdall's signing key: a "ed25519-" kid over a thumbprint prefix.</summary>
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public sealed class HeimdallKey
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{
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private readonly byte[] _seed;
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private HeimdallKey(byte[] seed, byte[] publicKey, string kid)
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{
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_seed = seed;
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PublicKey = publicKey;
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Kid = kid;
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}
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public string Kid { get; }
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public byte[] PublicKey { get; }
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public static HeimdallKey Generate(string? kid = null)
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{
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var seed = RandomNumberGenerator.GetBytes(Ed25519.SecretKeySize);
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var publicKey = new byte[Ed25519.PublicKeySize];
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Ed25519.GeneratePublicKey(seed, 0, publicKey, 0);
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kid ??= "ed25519-" + Convert.ToHexString(SHA256.HashData(publicKey)).ToLowerInvariant()[..12];
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return new HeimdallKey(seed, publicKey, kid);
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}
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public object Jwk() => new Dictionary<string, object?>
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{
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["kty"] = "OKP",
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["crv"] = "Ed25519",
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["x"] = WebEncoders.Base64UrlEncode(PublicKey),
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["alg"] = "EdDSA",
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["kid"] = Kid,
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["use"] = "sig"
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};
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/// <summary>Signs like Heimdall's signJwt: header {alg, kid, typ}, compact JWS.</summary>
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public string Sign(IDictionary<string, object?> claims, string alg = "EdDSA", string? kid = "") =>
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SignParts(HeaderBytes(alg, kid), JsonSerializer.SerializeToUtf8Bytes(claims));
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public byte[] HeaderBytes(string alg = "EdDSA", string? kid = "")
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{
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var header = new Dictionary<string, object?> { ["alg"] = alg, ["typ"] = "JWT" };
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if (kid is not null)
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{
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header["kid"] = kid.Length == 0 ? Kid : kid;
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}
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return JsonSerializer.SerializeToUtf8Bytes(header);
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}
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/// <summary>Signs exactly these header and payload bytes, whatever they hold.</summary>
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public string SignParts(byte[] headerBytes, byte[] payloadBytes)
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{
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var signingInput = WebEncoders.Base64UrlEncode(headerBytes) + "." + WebEncoders.Base64UrlEncode(payloadBytes);
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var message = Encoding.ASCII.GetBytes(signingInput);
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var signature = new byte[Ed25519.SignatureSize];
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Ed25519.Sign(_seed, 0, message, 0, message.Length, signature, 0);
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return signingInput + "." + WebEncoders.Base64UrlEncode(signature);
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}
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}
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public static class HeimdallShapes
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{
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public const string Issuer = "https://heimdall.test";
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public static string NewAccountId() => Guid.NewGuid().ToString();
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/// <summary>The claim set of Heimdall src/claims.ts issueAccessClaim.</summary>
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public static Dictionary<string, object?> AccessClaims(
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string accountId,
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DateTimeOffset now,
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string[]? capabilities = null,
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string? displayName = "Genuine Name",
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Action<Dictionary<string, object?>>? mutate = null)
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{
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var issuedAt = now.ToUnixTimeSeconds();
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var claims = new Dictionary<string, object?>
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{
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["iss"] = Issuer,
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["aud"] = "bifrost",
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["sub"] = accountId,
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["sid"] = Guid.NewGuid().ToString(),
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["jti"] = Guid.NewGuid().ToString(),
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["iat"] = issuedAt,
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["nbf"] = issuedAt,
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["exp"] = issuedAt + 900,
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["typ"] = "heimdall_access",
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["account_id"] = accountId,
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["access_revision"] = 1,
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["app"] = new Dictionary<string, object?> { ["slug"] = "bifrost", ["profile_version"] = 1 },
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["facts"] = Array.Empty<string>(),
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["capabilities"] = capabilities ?? [],
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["identities"] = new[]
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{
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new Dictionary<string, object?> { ["provider"] = "discord", ["providerUserId"] = "1234567890" }
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}
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};
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if (displayName is not null)
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{
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claims["display_name"] = displayName;
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}
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mutate?.Invoke(claims);
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return claims;
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}
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/// <summary>
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/// The body Heimdall's redeem route answers with: the completionPayload of src/app.ts, whose unsigned
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/// fields (loose capabilities, facts, name) Bifrost must not decide anything from.
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/// </summary>
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public static Dictionary<string, object?> Completion(
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string returnTo,
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string accountId,
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string accessToken,
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string[]? looseCapabilities = null,
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string[]? looseFacts = null,
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string looseName = "Loose Name") => new()
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{
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["status"] = "success",
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["provider"] = "discord",
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["mode"] = "sign_in",
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["appSlug"] = "bifrost",
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["account"] = new Dictionary<string, object?> { ["id"] = accountId, ["displayName"] = looseName },
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["entitlements"] = new Dictionary<string, object?>
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{
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["facts"] = looseFacts ?? [],
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["snapshots"] = Array.Empty<string>()
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},
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["returnTo"] = returnTo,
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["connection"] = null,
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["session"] = new Dictionary<string, object?> { ["accountId"] = accountId, ["appSlug"] = "bifrost" },
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["accessToken"] = accessToken,
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["refreshToken"] = "refresh-token-not-read",
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["refresh"] = new Dictionary<string, object?> { ["expiresAt"] = "2026-11-11T00:00:00.000Z" },
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["verification"] = new Dictionary<string, object?> { ["issuer"] = Issuer },
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["sharedCapabilities"] = looseCapabilities ?? [],
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["hybridCapabilities"] = Array.Empty<string>()
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};
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}
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public sealed class TestClock : TimeProvider
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{
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private DateTimeOffset _now = new(2026, 10, 11, 12, 0, 0, TimeSpan.Zero);
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public DateTimeOffset Now => _now;
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public void Advance(TimeSpan by) => _now += by;
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public override DateTimeOffset GetUtcNow() => _now;
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}
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/// <summary>
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/// Stands in for Heimdall's HTTP surface: the JWKS, the oauth start endpoint (which, like app.ts, answers
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/// a policy start only when the app caller's secret is present) and the completion-code redeem route.
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/// </summary>
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public sealed class FakeHeimdall : HttpMessageHandler
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{
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private readonly Dictionary<string, Dictionary<string, object?>> _codes = new(StringComparer.Ordinal);
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public List<HeimdallKey> Published { get; } = [];
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public List<object> ExtraJwks { get; } = [];
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public int JwksFetches { get; private set; }
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public HttpStatusCode JwksStatus { get; set; } = HttpStatusCode.OK;
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private TaskCompletionSource? _jwksHold;
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/// <summary>Completes when a JWKS request arrives after <see cref="HoldJwks"/>.</summary>
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public TaskCompletionSource JwksArrived { get; private set; } = new(TaskCreationOptions.RunContinuationsAsynchronously);
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/// <summary>Holds the next JWKS responses until the returned source completes.</summary>
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public TaskCompletionSource HoldJwks()
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{
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JwksArrived = new(TaskCreationOptions.RunContinuationsAsynchronously);
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return _jwksHold = new(TaskCreationOptions.RunContinuationsAsynchronously);
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}
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public Exception? JwksFailure { get; set; }
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public List<string> StartBodies { get; } = [];
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public List<string?> StartSecrets { get; } = [];
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/// <summary>The secret a policy start must carry in x-heimdall-app-secret; null means Heimdall asks for none.</summary>
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public string? RequiredAppSecret { get; set; }
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public HttpStatusCode StartStatus { get; set; } = HttpStatusCode.OK;
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public string StartBody { get; set; } =
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"""{"authorizationUrl":"https://heimdall.test/oauth/discord/authorize?state=fixture"}""";
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public int RedeemCalls { get; private set; }
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public HttpStatusCode? RedeemStatus { get; set; }
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public string? RedeemBody { get; set; }
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/// <summary>Registers a completion code Heimdall will redeem once, answering with this payload.</summary>
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public string RegisterCode(Dictionary<string, object?> completion)
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{
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var code = Convert.ToHexString(RandomNumberGenerator.GetBytes(16)).ToLowerInvariant();
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_codes[code] = completion;
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return code;
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}
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protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
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{
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var path = request.RequestUri!.AbsolutePath;
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if (request.Method == HttpMethod.Get && path == "/.well-known/jwks.json")
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{
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JwksFetches++;
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JwksArrived.TrySetResult();
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if (_jwksHold is not null)
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{
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await _jwksHold.Task.WaitAsync(cancellationToken);
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}
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if (JwksFailure is not null)
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{
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throw JwksFailure;
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}
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var keys = Published.Select(x => x.Jwk()).Concat(ExtraJwks).ToArray();
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return new HttpResponseMessage(JwksStatus)
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{
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Content = new StringContent(JsonSerializer.Serialize(new { keys }), Encoding.UTF8, "application/json")
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};
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}
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if (request.Method == HttpMethod.Post && path.StartsWith("/v1/oauth/", StringComparison.Ordinal) && path.EndsWith("/start", StringComparison.Ordinal))
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{
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var body = await request.Content!.ReadAsStringAsync(cancellationToken);
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var secret = request.Headers.TryGetValues("x-heimdall-app-secret", out var values) ? values.Single() : null;
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StartBodies.Add(body);
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StartSecrets.Add(secret);
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var wantsPolicy = JsonDocument.Parse(body).RootElement.TryGetProperty("entitlementPolicy", out _);
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if (wantsPolicy && RequiredAppSecret is not null && secret != RequiredAppSecret)
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{
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return new HttpResponseMessage(HttpStatusCode.Unauthorized)
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{
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Content = new StringContent("""{"error":"app_auth_required"}""", Encoding.UTF8, "application/json")
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};
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}
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return new HttpResponseMessage(StartStatus)
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{
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Content = new StringContent(StartBody, Encoding.UTF8, "application/json")
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};
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}
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if (request.Method == HttpMethod.Post && path == "/v1/apps/bifrost/auth-completions/redeem")
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{
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RedeemCalls++;
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if (RedeemStatus is { } status)
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{
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return new HttpResponseMessage(status)
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{
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Content = new StringContent(RedeemBody ?? "{}", Encoding.UTF8, "application/json")
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};
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}
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var code = JsonDocument.Parse(await request.Content!.ReadAsStringAsync(cancellationToken))
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.RootElement.GetProperty("completionCode").GetString()!;
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if (!_codes.Remove(code, out var completion))
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{
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return new HttpResponseMessage(HttpStatusCode.Gone)
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{
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Content = new StringContent("""{"error":"invalid_or_expired_completion_code"}""", Encoding.UTF8, "application/json")
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};
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}
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return new HttpResponseMessage(HttpStatusCode.Created)
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{
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Content = new StringContent(RedeemBody ?? JsonSerializer.Serialize(completion), Encoding.UTF8, "application/json")
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};
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}
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return new HttpResponseMessage(HttpStatusCode.NotFound);
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}
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}
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public sealed class CapturedLogs : ILoggerProvider
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{
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private readonly List<string> _lines = [];
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public IReadOnlyList<string> Lines
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{
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get
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{
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lock (_lines)
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{
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return _lines.ToArray();
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}
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}
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}
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public ILogger CreateLogger(string categoryName) => new Capture(this);
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public void Dispose()
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{
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}
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private sealed class Capture(CapturedLogs owner) : ILogger
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{
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public IDisposable? BeginScope<TState>(TState state) where TState : notnull => null;
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public bool IsEnabled(LogLevel logLevel) => true;
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public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception? exception, Func<TState, Exception?, string> formatter)
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{
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lock (owner._lines)
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{
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owner._lines.Add(formatter(state, exception) + (exception is null ? string.Empty : "\n" + exception));
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}
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}
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}
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}
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/// <summary>An attempt Start issued: its nonce, the cookie it set, and the returnTo it sent Heimdall.</summary>
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public sealed record StartedAttempt(string Nonce, string? CookieName, string? Cookie, string ReturnTo, HttpResponseMessage Response);
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public sealed record CompletionResult(HttpResponseMessage Response, bool SignedIn);
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/// <summary>A local Bifrost with Heimdall faked in-process: a test JWKS, a test clock, captured logs.</summary>
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public sealed class HeimdallHost : TestWebApplicationFactory
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{
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public const string AppSecret = "test-heimdall-app-secret";
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private readonly string _appSecret;
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private readonly string _appSlug;
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private readonly string _baseUrl;
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private readonly string _publicBaseUrl;
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private readonly bool _discordRoles;
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public TestClock Clock { get; } = new();
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public FakeHeimdall Heimdall { get; } = new();
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public CapturedLogs Logs { get; } = new();
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public HeimdallKey Key { get; } = HeimdallKey.Generate();
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public HeimdallHost(
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string appSecret = AppSecret,
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string baseUrl = HeimdallShapes.Issuer,
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string publicBaseUrl = "https://localhost",
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bool discordRoles = true,
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string appSlug = "bifrost")
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{
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_appSecret = appSecret;
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_appSlug = appSlug;
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_baseUrl = baseUrl;
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_publicBaseUrl = publicBaseUrl;
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_discordRoles = discordRoles;
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Heimdall.Published.Add(Key);
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Heimdall.RequiredAppSecret = AppSecret;
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}
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protected override void ConfigureWebHost(IWebHostBuilder builder)
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{
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base.ConfigureWebHost(builder);
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// The GitHub OAuth scheme is registered from configuration read while the app builds, which only host settings reach.
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builder.UseSetting("GitHubOAuth:ClientId", "configured-for-tests");
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builder.UseSetting("GitHubOAuth:ClientSecret", "configured-for-tests");
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builder.ConfigureAppConfiguration((_, configuration) =>
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{
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configuration.AddInMemoryCollection(new Dictionary<string, string?>
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{
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["Heimdall:BaseUrl"] = _baseUrl,
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["Heimdall:AppSecret"] = _appSecret,
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["Heimdall:AppSlug"] = _appSlug,
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["Heimdall:DiscordGuildId"] = "guild-1",
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["Host:PublicBaseUrl"] = _publicBaseUrl
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});
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if (_discordRoles)
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{
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configuration.AddInMemoryCollection(new Dictionary<string, string?> { ["Heimdall:DiscordAllowedRoleIds:0"] = "role-1" });
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}
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});
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builder.ConfigureLogging(logging => logging.AddProvider(Logs));
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builder.ConfigureServices(services =>
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{
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services.RemoveAll<TimeProvider>();
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services.AddSingleton<TimeProvider>(Clock);
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services.AddHttpClient(HeimdallTokenVerifier.ClientName).ConfigurePrimaryHttpMessageHandler(() => Heimdall);
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services.AddHttpClient<HeimdallAuthService>().ConfigurePrimaryHttpMessageHandler(() => Heimdall);
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});
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}
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public HttpClient NewClient() => CreateClient(new WebApplicationFactoryClientOptions
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{
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AllowAutoRedirect = false,
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HandleCookies = false,
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BaseAddress = new Uri("https://localhost")
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});
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public string Token(string accountId, string[]? capabilities = null, string? displayName = "Genuine Name",
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Action<Dictionary<string, object?>>? mutate = null, HeimdallKey? signer = null) =>
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(signer ?? Key).Sign(HeimdallShapes.AccessClaims(accountId, Clock.Now, capabilities, displayName, mutate));
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public Task<StartedAttempt> StartAsync(
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bool member = false, string provider = "discord", string returnUrl = "/App/Mill", string? cookieHeader = null) =>
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StartAtAsync(
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$"/auth/heimdall/{provider}?returnUrl={Uri.EscapeDataString(returnUrl)}" + (member ? "&access=member" : string.Empty),
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cookieHeader);
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public async Task<StartedAttempt> StartAtAsync(string url, string? cookieHeader = null)
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{
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using var client = NewClient();
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var before = Heimdall.StartBodies.Count;
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using var request = new HttpRequestMessage(HttpMethod.Get, url);
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if (cookieHeader is not null)
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{
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request.Headers.Add("Cookie", cookieHeader);
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}
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var response = await client.SendAsync(request);
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if (Heimdall.StartBodies.Count == before)
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{
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return new StartedAttempt(string.Empty, null, null, string.Empty, response);
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}
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var returnTo = JsonDocument.Parse(Heimdall.StartBodies[^1]).RootElement.GetProperty("returnTo").GetString()!;
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var nonce = QueryHelpers.ParseQuery(new Uri(returnTo).Query)["attempt"].ToString();
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var slot = HeimdallAttemptCookie.SlotNames.FirstOrDefault(x => CookieValue(response, x) is { Length: > 0 });
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return new StartedAttempt(nonce, slot, slot is null ? null : CookieValue(response, slot), returnTo, response);
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}
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/// <summary>Registers a completion code as Heimdall would mint it after authenticating this attempt.</summary>
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public string CodeFor(StartedAttempt attempt, string accountId, string? accessToken = null, string[]? looseCapabilities = null,
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string[]? looseFacts = null, string looseName = "Loose Name", string? returnTo = null)
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{
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var completion = HeimdallShapes.Completion(
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returnTo ?? attempt.ReturnTo, accountId, accessToken ?? Token(accountId), looseCapabilities, looseFacts, looseName);
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return Heimdall.RegisterCode(completion);
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}
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/// <summary>The browser's POST from the complete page: the attempt and code in a form, the attempt cookie by name.</summary>
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public Task<CompletionResult> CompleteAsync(string? nonce, string? code, string? cookie, string? cookieName = null) =>
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CompleteWithHeaderAsync(
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nonce, code, cookie is null ? null : $"{cookieName ?? HeimdallAttemptCookie.SlotNames[0]}={cookie}");
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/// <summary>The same POST carrying a browser's whole Cookie header (a jar), not one attempt cookie.</summary>
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public async Task<CompletionResult> CompleteWithHeaderAsync(string? nonce, string? code, string? cookieHeader)
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{
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using var client = NewClient();
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var fields = new Dictionary<string, string>();
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if (nonce is not null)
|
|
{
|
|
fields["attempt"] = nonce;
|
|
}
|
|
|
|
if (code is not null)
|
|
{
|
|
fields["code"] = code;
|
|
}
|
|
|
|
using var request = new HttpRequestMessage(HttpMethod.Post, "/auth/heimdall/complete") { Content = new FormUrlEncodedContent(fields) };
|
|
if (cookieHeader is not null)
|
|
{
|
|
request.Headers.Add("Cookie", cookieHeader);
|
|
}
|
|
|
|
var response = await client.SendAsync(request);
|
|
var session = CookieValue(response, ".AspNetCore.Cookies");
|
|
return new CompletionResult(response, !string.IsNullOrEmpty(session));
|
|
}
|
|
|
|
public Task<CompletionResult> CompleteAsync(StartedAttempt attempt, string code) =>
|
|
CompleteAsync(attempt.Nonce, code, attempt.Cookie, attempt.CookieName);
|
|
|
|
public static string? CookieValue(HttpResponseMessage response, string name)
|
|
{
|
|
if (!response.Headers.TryGetValues("Set-Cookie", out var headers))
|
|
{
|
|
return null;
|
|
}
|
|
|
|
var prefix = name + "=";
|
|
var header = headers.FirstOrDefault(x => x.StartsWith(prefix, StringComparison.Ordinal));
|
|
return header?[prefix.Length..].Split(';')[0];
|
|
}
|
|
|
|
public static string? SetCookieHeader(HttpResponseMessage response, string name) =>
|
|
response.Headers.TryGetValues("Set-Cookie", out var headers)
|
|
? headers.FirstOrDefault(x => x.StartsWith(name + "=", StringComparison.Ordinal))
|
|
: null;
|
|
|
|
public async Task<T> Db<T>(Func<BifrostDbContext, Task<T>> query)
|
|
{
|
|
using var scope = Services.CreateScope();
|
|
return await query(scope.ServiceProvider.GetRequiredService<BifrostDbContext>());
|
|
}
|
|
|
|
public Task<Bifrost.Web.Domain.UserAccount?> Account(string heimdallAccountId) =>
|
|
Db(db => db.UserAccounts
|
|
.Include(x => x.Membership!).ThenInclude(x => x.RoleAssignments)
|
|
.SingleOrDefaultAsync(x => x.HeimdallAccountId == heimdallAccountId));
|
|
|
|
public Task<int> AccountCount() => Db(db => db.UserAccounts.CountAsync());
|
|
}
|