79 lines
2.9 KiB
C#
79 lines
2.9 KiB
C#
using System.Diagnostics.CodeAnalysis;
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using JetBrains.Annotations;
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namespace Foxnouns.Backend.Services;
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public class RemoteAuthService(Config config, ILogger logger)
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{
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private readonly ILogger _logger = logger.ForContext<RemoteAuthService>();
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private readonly HttpClient _httpClient = new();
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private readonly Uri _discordTokenUri = new("https://discord.com/api/oauth2/token");
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private readonly Uri _discordUserUri = new("https://discord.com/api/v10/users/@me");
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public async Task<RemoteUser> RequestDiscordTokenAsync(
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string code,
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CancellationToken ct = default
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)
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{
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var redirectUri = $"{config.BaseUrl}/auth/callback/discord";
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var resp = await _httpClient.PostAsync(
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_discordTokenUri,
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new FormUrlEncodedContent(
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new Dictionary<string, string>
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{
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{ "client_id", config.DiscordAuth.ClientId! },
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{ "client_secret", config.DiscordAuth.ClientSecret! },
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{ "grant_type", "authorization_code" },
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{ "code", code },
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{ "redirect_uri", redirectUri },
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}
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),
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ct
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);
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if (!resp.IsSuccessStatusCode)
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{
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var respBody = await resp.Content.ReadAsStringAsync(ct);
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_logger.Error(
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"Received error status {StatusCode} when exchanging OAuth token: {ErrorBody}",
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(int)resp.StatusCode,
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respBody
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);
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throw new FoxnounsError("Invalid Discord OAuth response");
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}
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resp.EnsureSuccessStatusCode();
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var token = await resp.Content.ReadFromJsonAsync<DiscordTokenResponse>(ct);
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if (token == null)
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throw new FoxnounsError("Discord token response was null");
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var req = new HttpRequestMessage(HttpMethod.Get, _discordUserUri);
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req.Headers.Add("Authorization", $"{token.token_type} {token.access_token}");
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var resp2 = await _httpClient.SendAsync(req, ct);
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resp2.EnsureSuccessStatusCode();
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var user = await resp2.Content.ReadFromJsonAsync<DiscordUserResponse>(ct);
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if (user == null)
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throw new FoxnounsError("Discord user response was null");
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return new RemoteUser(user.id, user.username);
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}
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[SuppressMessage(
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"ReSharper",
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"InconsistentNaming",
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Justification = "Easier to use snake_case here, rather than passing in JSON converter options"
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)]
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[UsedImplicitly]
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private record DiscordTokenResponse(string access_token, string token_type);
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[SuppressMessage(
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"ReSharper",
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"InconsistentNaming",
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Justification = "Easier to use snake_case here, rather than passing in JSON converter options"
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)]
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[UsedImplicitly]
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private record DiscordUserResponse(string id, string username);
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public record RemoteUser(string Id, string Username);
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}
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