Services/Federation and Controllers/ServerToServer become
Federation/{Actors,Signing,Inbox,Outbox,Rendering,Controllers}, the first step
of the roadmap's layout. No type, route or behaviour changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
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thepraandClaude Opus 5.5 committed
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using Microsoft.Extensions.Options;
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using MongoDB.Entities;
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using PrivaPub.Models;
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using PrivaPub.Models.Federation;
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using PrivaPub.Models.User;
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using PrivaPub.StaticServices;
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using System.Security.Cryptography;
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using GroupEntity = PrivaPub.Models.Group.Group;
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namespace PrivaPub.Federation.Actors
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{
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public class LocalActor
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{
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public string Id { get; init; }
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public LocalActorKind Kind { get; init; }
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public string UserName { get; init; }
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public string Name { get; init; }
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public string Summary { get; init; }
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public string PictureURL { get; init; }
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public string ThumbnailURL { get; init; }
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public string PrivateKeyPem { get; init; }
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public string PublicKeyPem { get; init; }
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public bool Discoverable { get; init; } = true;
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public bool ManuallyApprovesFollowers { get; init; }
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public DateTime Published { get; init; }
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public string BaseAddress { get; init; }
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public string Uri => $"{BaseAddress}/peasants/{UserName}";
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public string KeyId => $"{Uri}#main-key";
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public string Inbox => $"{Uri}/mouth";
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public string Outbox => $"{Uri}/anus";
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public string Followers => $"{Uri}/followers";
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public string Following => $"{Uri}/following";
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public string SharedInbox => $"{BaseAddress}/human-centipede";
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public string Domain => new Uri(BaseAddress).Authority;
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public string Handle => $"{UserName}@{Domain}";
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public string PostUri(string postId) => $"{Uri}/posts/{postId}";
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public string ActivityUri(string activityId) => $"{Uri}/activities/{activityId}";
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}
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public interface ILocalActorService
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{
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string BaseAddress { get; }
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Task<LocalActor> FindByUserName(string userName, CancellationToken token);
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Task<LocalActor> FindById(LocalActorKind kind, string id, CancellationToken token);
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Task<LocalActor> FindByUri(string actorUri, CancellationToken token);
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Task<LocalActor> GetInstanceActor(CancellationToken token);
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Task<bool> IsUserNameTaken(string userName, CancellationToken token);
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LocalActor FromAvatar(Avatar avatar);
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LocalActor FromGroup(GroupEntity group);
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}
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public class LocalActorService : ILocalActorService
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{
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public const string InstanceUserName = "privapub";
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readonly DbEntities _dbEntities;
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readonly IOptionsMonitor<AppConfiguration> _appConfiguration;
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public LocalActorService(DbEntities dbEntities, IOptionsMonitor<AppConfiguration> appConfiguration)
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{
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_dbEntities = dbEntities;
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_appConfiguration = appConfiguration;
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}
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public string BaseAddress => _appConfiguration.CurrentValue.BackendBaseAddress?.TrimEnd('/');
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public async Task<LocalActor> FindByUserName(string userName, CancellationToken token)
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{
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if (string.IsNullOrEmpty(userName))
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return default;
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userName = userName.ToLowerInvariant();
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if (userName == InstanceUserName)
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return await GetInstanceActor(token);
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var avatar = await _dbEntities.Avatars
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.Match(a => a.UserName == userName && !a.DeletionAt.HasValue)
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.ExecuteFirstAsync(token);
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if (avatar != default)
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return FromAvatar(avatar);
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var group = await _dbEntities.Groups
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.Match(g => g.UserName == userName && !g.DeletionAt.HasValue)
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.ExecuteFirstAsync(token);
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return group == default ? default : FromGroup(group);
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}
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public async Task<LocalActor> FindById(LocalActorKind kind, string id, CancellationToken token)
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{
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switch (kind)
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{
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case LocalActorKind.Person:
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var avatar = await _dbEntities.Avatars.MatchID(id).ExecuteFirstAsync(token);
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return avatar == default ? default : FromAvatar(avatar);
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case LocalActorKind.Group:
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var group = await _dbEntities.Groups.MatchID(id).ExecuteFirstAsync(token);
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return group == default ? default : FromGroup(group);
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default:
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return await GetInstanceActor(token);
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}
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}
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public Task<LocalActor> FindByUri(string actorUri, CancellationToken token)
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{
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var prefix = $"{BaseAddress}/peasants/";
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if (string.IsNullOrEmpty(actorUri) || !actorUri.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
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return Task.FromResult<LocalActor>(default);
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var userName = actorUri[prefix.Length..].Split('/', '#', '?')[0];
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return FindByUserName(userName, token);
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}
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public async Task<LocalActor> GetInstanceActor(CancellationToken token)
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{
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var instance = await _dbEntities.InstanceActors.ExecuteFirstAsync(token);
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if (instance == default)
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{
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var (privateKey, publicKey) = Keys.NewKeyPair();
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instance = new InstanceActor { PrivateKey = privateKey, PublicKey = publicKey };
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await DB.Default.SaveAsync(instance, token);
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}
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return new LocalActor
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{
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Id = instance.ID,
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Kind = LocalActorKind.Application,
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UserName = InstanceUserName,
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Name = "PrivaPub",
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Summary = "The instance actor of this PrivaPub server; it signs the requests no other actor speaks for.",
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PrivateKeyPem = instance.PrivateKey,
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PublicKeyPem = instance.PublicKey,
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Discoverable = false,
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Published = instance.CreationDate,
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BaseAddress = BaseAddress
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};
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}
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public async Task<bool> IsUserNameTaken(string userName, CancellationToken token)
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{
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userName = userName?.ToLowerInvariant();
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if (string.IsNullOrEmpty(userName) || userName == InstanceUserName)
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return true;
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if (await _dbEntities.Avatars.Match(a => a.UserName == userName).ExecuteAnyAsync(token))
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return true;
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return await _dbEntities.Groups.Match(g => g.UserName == userName).ExecuteAnyAsync(token);
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}
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public LocalActor FromAvatar(Avatar avatar) => new()
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{
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Id = avatar.ID,
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Kind = LocalActorKind.Person,
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UserName = avatar.UserName,
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Name = string.IsNullOrEmpty(avatar.Name) ? avatar.UserName : avatar.Name,
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Summary = avatar.Biography,
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PictureURL = avatar.PictureURL,
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ThumbnailURL = avatar.ThumbnailURL,
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PrivateKeyPem = avatar.PrivateKey,
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PublicKeyPem = avatar.PublicKey,
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Published = avatar.CreatedAt,
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BaseAddress = BaseAddress
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};
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public LocalActor FromGroup(GroupEntity group) => new()
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{
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Id = group.ID,
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Kind = LocalActorKind.Group,
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UserName = group.UserName,
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Name = string.IsNullOrEmpty(group.Name) ? group.UserName : group.Name,
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Summary = group.Description,
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PictureURL = group.PictureURL,
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ThumbnailURL = group.ThumbnailURL,
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PrivateKeyPem = group.PrivateKey,
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PublicKeyPem = group.PublicKey,
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Discoverable = group.IsDiscoverable,
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ManuallyApprovesFollowers = group.ManuallyApprovesMembers,
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Published = group.CreationDate,
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BaseAddress = BaseAddress
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};
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}
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public static class Keys
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{
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public static (string PrivateKeyPem, string PublicKeyPem) NewKeyPair()
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{
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using var rsa = RSA.Create(2048);
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return (rsa.ExportRSAPrivateKeyPem(), rsa.ExportSubjectPublicKeyInfoPem());
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}
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public static string ToSubjectPublicKeyInfoPem(string publicKeyPem)
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{
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if (string.IsNullOrEmpty(publicKeyPem) || publicKeyPem.Contains("BEGIN PUBLIC KEY"))
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return publicKeyPem;
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using var rsa = RSA.Create();
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rsa.ImportFromPem(publicKeyPem);
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return rsa.ExportSubjectPublicKeyInfoPem();
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}
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}
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}
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