init

Foxchat.Identity/Authorization/AuthenticationHandler.cs

@@ -0,0 +1,9 @@
+namespace Foxchat.Identity.Authorization;
+
+public static class AuthenticationHandlerExtensions
+{
+    public static void AddAuthenticationHandler(this IServiceCollection services)
+    {
+
+    }
+}

Foxchat.Identity/Controllers/NodeController.cs

@@ -0,0 +1,27 @@
+using Foxchat.Core.Models;
+using Foxchat.Identity.Database;
+using Foxchat.Identity.Services;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Foxchat.Identity.Controllers;
+
+[ApiController]
+[Route("/_fox/ident/node")]
+public class NodeController(IdentityContext context, ChatInstanceResolverService chatInstanceResolverService) : ControllerBase
+{
+    public const string SOFTWARE_NAME = "Foxchat.NET.Identity";
+
+    [HttpGet]
+    public async Task<IActionResult> GetNode()
+    {
+        var instance = await context.GetInstanceAsync();
+        return Ok(new NodeInfo(SOFTWARE_NAME, instance.PublicKey));
+    }
+
+    [HttpGet("{domain}")]
+    public async Task<IActionResult> GetChatNode(string domain)
+    {
+        var instance = await chatInstanceResolverService.ResolveChatInstanceAsync(domain);
+        return Ok(instance);
+    }
+}

Foxchat.Identity/Database/IdentityContext.cs

@@ -0,0 +1,63 @@
+using Foxchat.Core;
+using Foxchat.Core.Database;
+using Foxchat.Identity.Database.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace Foxchat.Identity.Database;
+
+public class IdentityContext : IDatabaseContext
+{
+    private readonly string _connString;
+
+    public DbSet<Account> Accounts { get; set; }
+    public DbSet<ChatInstance> ChatInstances { get; set; }
+    public override DbSet<Instance> Instance { get; set; }
+    public DbSet<Token> Tokens { get; set; }
+    public DbSet<GuildAccount> GuildAccounts { get; set; }
+
+    public IdentityContext(InstanceConfig config)
+    {
+        _connString = new Npgsql.NpgsqlConnectionStringBuilder(config.Database.Url)
+        {
+            Timeout = config.Database.Timeout ?? 5,
+            MaxPoolSize = config.Database.MaxPoolSize ?? 50,
+        }.ConnectionString;
+    }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+            => optionsBuilder
+                .UseNpgsql(_connString)
+                .UseSnakeCaseNamingConvention();
+
+    protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder)
+    {
+        // ULIDs are stored as UUIDs in the database
+        configurationBuilder.Properties<Ulid>().HaveConversion<UlidConverter>();
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Account>().HasIndex(a => a.Username).IsUnique();
+        modelBuilder.Entity<Account>().HasIndex(a => a.Email).IsUnique();
+
+        modelBuilder.Entity<ChatInstance>().HasIndex(i => i.Domain).IsUnique();
+
+        modelBuilder.Entity<GuildAccount>().HasKey(g => new { g.ChatInstanceId, g.GuildId, g.AccountId });
+    }
+}
+
+public class DesignTimeIdentityContextFactory : IDesignTimeDbContextFactory<IdentityContext>
+{
+    public IdentityContext CreateDbContext(string[] args)
+    {
+        // Read the configuration file
+        var config = new ConfigurationBuilder()
+            .AddConfiguration("identity.ini")
+            .Build()
+            // Get the configuration as our config class
+            .Get<InstanceConfig>() ?? new();
+
+        return new IdentityContext(config);
+    }
+}

Foxchat.Identity/Database/Models/Account.cs

@@ -0,0 +1,21 @@
+namespace Foxchat.Identity.Database.Models;
+
+public class Account
+{
+    public Ulid Id { get; init; } = Ulid.NewUlid();
+    public string Username { get; set; } = null!;
+    public string Email { get; set; } = null!;
+    public string Password { get; set; } = null!;
+    public AccountRole Role { get; set; }
+
+    public string? Avatar { get; set; }
+
+    public List<Token> Tokens { get; } = [];
+    public List<ChatInstance> ChatInstances { get; } = [];
+
+    public enum AccountRole
+    {
+        User,
+        Admin,
+    }
+}

Foxchat.Identity/Database/Models/ChatInstance.cs

@@ -0,0 +1,19 @@
+namespace Foxchat.Identity.Database.Models;
+
+public class ChatInstance
+{
+    public Ulid Id { get; init; } = Ulid.NewUlid();
+    public string Domain { get; init; } = null!;
+    public string BaseUrl { get; set; } = null!;
+    public string PublicKey { get; set; } = null!;
+    public InstanceStatus Status { get; set; }
+    public string? Reason { get; set; }
+
+    public List<Account> Accounts { get; } = [];
+
+    public enum InstanceStatus
+    {
+        Active,
+        Suspended,
+    }
+}

Foxchat.Identity/Database/Models/GuildAccount.cs

@@ -0,0 +1,10 @@
+namespace Foxchat.Identity.Database.Models;
+
+public class GuildAccount
+{
+    public Ulid ChatInstanceId { get; init; }
+    public ChatInstance ChatInstance { get; init; } = null!;
+    public string GuildId { get; init; } = null!;
+    public Ulid AccountId { get; init; }
+    public Account Account { get; init; } = null!;
+}

Foxchat.Identity/Database/Models/Token.cs

@@ -0,0 +1,8 @@
+namespace Foxchat.Identity.Database.Models;
+
+public class Token
+{
+    public Ulid Id { get; init; } = Ulid.NewUlid();
+    public Ulid AccountId { get; set; }
+    public Account Account { get; set; } = null!;
+}

Foxchat.Identity/Foxchat.Identity.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="EFCore.NamingConventions" Version="8.0.3" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.4" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.4" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.4" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.4">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.2" />
+    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog.AspNetCore" Version="8.0.1" />
+    <PackageReference Include="Serilog.Sinks.Console" Version="5.0.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Foxchat.Core\Foxchat.Core.csproj" />
+  </ItemGroup>
+</Project>

Foxchat.Identity/GlobalUsing.cs

@@ -0,0 +1,3 @@
+global using ILogger = Serilog.ILogger;
+global using Log = Serilog.Log;
+global using NUlid;

Foxchat.Identity/InstanceConfig.cs

@@ -0,0 +1,7 @@
+using Foxchat.Core;
+
+namespace Foxchat.Identity;
+
+public class InstanceConfig : CoreConfig
+{
+}

Foxchat.Identity/Migrations/20240512225835_Init.Designer.cs

@@ -0,0 +1,253 @@
+// <auto-generated />
+using System;
+using Foxchat.Identity.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace Foxchat.Identity.Migrations
+{
+    [DbContext(typeof(IdentityContext))]
+    [Migration("20240512225835_Init")]
+    partial class Init
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.4")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("AccountChatInstance", b =>
+                {
+                    b.Property<Guid>("AccountsId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("accounts_id");
+
+                    b.Property<Guid>("ChatInstancesId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("chat_instances_id");
+
+                    b.HasKey("AccountsId", "ChatInstancesId")
+                        .HasName("pk_account_chat_instance");
+
+                    b.HasIndex("ChatInstancesId")
+                        .HasDatabaseName("ix_account_chat_instance_chat_instances_id");
+
+                    b.ToTable("account_chat_instance", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Core.Database.Instance", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("PrivateKey")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("private_key");
+
+                    b.Property<string>("PublicKey")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("public_key");
+
+                    b.HasKey("Id")
+                        .HasName("pk_instance");
+
+                    b.ToTable("instance", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Account", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<string>("Avatar")
+                        .HasColumnType("text")
+                        .HasColumnName("avatar");
+
+                    b.Property<string>("Email")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("email");
+
+                    b.Property<string>("Password")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("password");
+
+                    b.Property<int>("Role")
+                        .HasColumnType("integer")
+                        .HasColumnName("role");
+
+                    b.Property<string>("Username")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("username");
+
+                    b.HasKey("Id")
+                        .HasName("pk_accounts");
+
+                    b.HasIndex("Email")
+                        .IsUnique()
+                        .HasDatabaseName("ix_accounts_email");
+
+                    b.HasIndex("Username")
+                        .IsUnique()
+                        .HasDatabaseName("ix_accounts_username");
+
+                    b.ToTable("accounts", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.ChatInstance", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<string>("BaseUrl")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("base_url");
+
+                    b.Property<string>("Domain")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("domain");
+
+                    b.Property<string>("PublicKey")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("public_key");
+
+                    b.Property<string>("Reason")
+                        .HasColumnType("text")
+                        .HasColumnName("reason");
+
+                    b.Property<int>("Status")
+                        .HasColumnType("integer")
+                        .HasColumnName("status");
+
+                    b.HasKey("Id")
+                        .HasName("pk_chat_instances");
+
+                    b.HasIndex("Domain")
+                        .IsUnique()
+                        .HasDatabaseName("ix_chat_instances_domain");
+
+                    b.ToTable("chat_instances", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.GuildAccount", b =>
+                {
+                    b.Property<Guid>("ChatInstanceId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("chat_instance_id");
+
+                    b.Property<string>("GuildId")
+                        .HasColumnType("text")
+                        .HasColumnName("guild_id");
+
+                    b.Property<Guid>("AccountId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("account_id");
+
+                    b.HasKey("ChatInstanceId", "GuildId", "AccountId")
+                        .HasName("pk_guild_accounts");
+
+                    b.HasIndex("AccountId")
+                        .HasDatabaseName("ix_guild_accounts_account_id");
+
+                    b.ToTable("guild_accounts", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Token", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<Guid>("AccountId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("account_id");
+
+                    b.HasKey("Id")
+                        .HasName("pk_tokens");
+
+                    b.HasIndex("AccountId")
+                        .HasDatabaseName("ix_tokens_account_id");
+
+                    b.ToTable("tokens", (string)null);
+                });
+
+            modelBuilder.Entity("AccountChatInstance", b =>
+                {
+                    b.HasOne("Foxchat.Identity.Database.Models.Account", null)
+                        .WithMany()
+                        .HasForeignKey("AccountsId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_account_chat_instance_accounts_accounts_id");
+
+                    b.HasOne("Foxchat.Identity.Database.Models.ChatInstance", null)
+                        .WithMany()
+                        .HasForeignKey("ChatInstancesId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_account_chat_instance_chat_instances_chat_instances_id");
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.GuildAccount", b =>
+                {
+                    b.HasOne("Foxchat.Identity.Database.Models.Account", "Account")
+                        .WithMany()
+                        .HasForeignKey("AccountId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_guild_accounts_accounts_account_id");
+
+                    b.HasOne("Foxchat.Identity.Database.Models.ChatInstance", "ChatInstance")
+                        .WithMany()
+                        .HasForeignKey("ChatInstanceId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_guild_accounts_chat_instances_chat_instance_id");
+
+                    b.Navigation("Account");
+
+                    b.Navigation("ChatInstance");
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Token", b =>
+                {
+                    b.HasOne("Foxchat.Identity.Database.Models.Account", "Account")
+                        .WithMany("Tokens")
+                        .HasForeignKey("AccountId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_tokens_accounts_account_id");
+
+                    b.Navigation("Account");
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Account", b =>
+                {
+                    b.Navigation("Tokens");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Foxchat.Identity/Migrations/20240512225835_Init.cs

@@ -0,0 +1,181 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace Foxchat.Identity.Migrations
+{
+    /// <inheritdoc />
+    public partial class Init : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "accounts",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    username = table.Column<string>(type: "text", nullable: false),
+                    email = table.Column<string>(type: "text", nullable: false),
+                    password = table.Column<string>(type: "text", nullable: false),
+                    role = table.Column<int>(type: "integer", nullable: false),
+                    avatar = table.Column<string>(type: "text", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_accounts", x => x.id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "chat_instances",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    domain = table.Column<string>(type: "text", nullable: false),
+                    base_url = table.Column<string>(type: "text", nullable: false),
+                    public_key = table.Column<string>(type: "text", nullable: false),
+                    status = table.Column<int>(type: "integer", nullable: false),
+                    reason = table.Column<string>(type: "text", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_chat_instances", x => x.id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "instance",
+                columns: table => new
+                {
+                    id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    public_key = table.Column<string>(type: "text", nullable: false),
+                    private_key = table.Column<string>(type: "text", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_instance", x => x.id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "tokens",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    account_id = table.Column<Guid>(type: "uuid", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_tokens", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_tokens_accounts_account_id",
+                        column: x => x.account_id,
+                        principalTable: "accounts",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "account_chat_instance",
+                columns: table => new
+                {
+                    accounts_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    chat_instances_id = table.Column<Guid>(type: "uuid", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_account_chat_instance", x => new { x.accounts_id, x.chat_instances_id });
+                    table.ForeignKey(
+                        name: "fk_account_chat_instance_accounts_accounts_id",
+                        column: x => x.accounts_id,
+                        principalTable: "accounts",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "fk_account_chat_instance_chat_instances_chat_instances_id",
+                        column: x => x.chat_instances_id,
+                        principalTable: "chat_instances",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "guild_accounts",
+                columns: table => new
+                {
+                    chat_instance_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    guild_id = table.Column<string>(type: "text", nullable: false),
+                    account_id = table.Column<Guid>(type: "uuid", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_guild_accounts", x => new { x.chat_instance_id, x.guild_id, x.account_id });
+                    table.ForeignKey(
+                        name: "fk_guild_accounts_accounts_account_id",
+                        column: x => x.account_id,
+                        principalTable: "accounts",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "fk_guild_accounts_chat_instances_chat_instance_id",
+                        column: x => x.chat_instance_id,
+                        principalTable: "chat_instances",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "ix_account_chat_instance_chat_instances_id",
+                table: "account_chat_instance",
+                column: "chat_instances_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_accounts_email",
+                table: "accounts",
+                column: "email",
+                unique: true);
+
+            // EF Core doesn't support creating indexes on arbitrary expressions, so we have to create it manually.
+            migrationBuilder.Sql("CREATE UNIQUE INDEX ix_accounts_username ON accounts (lower(username))");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_chat_instances_domain",
+                table: "chat_instances",
+                column: "domain",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "ix_guild_accounts_account_id",
+                table: "guild_accounts",
+                column: "account_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_tokens_account_id",
+                table: "tokens",
+                column: "account_id");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "account_chat_instance");
+
+            migrationBuilder.DropTable(
+                name: "guild_accounts");
+
+            migrationBuilder.DropTable(
+                name: "instance");
+
+            migrationBuilder.DropTable(
+                name: "tokens");
+
+            migrationBuilder.DropTable(
+                name: "chat_instances");
+
+            migrationBuilder.DropTable(
+                name: "accounts");
+        }
+    }
+}

Foxchat.Identity/Migrations/IdentityContextModelSnapshot.cs

@@ -0,0 +1,250 @@
+// <auto-generated />
+using System;
+using Foxchat.Identity.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace Foxchat.Identity.Migrations
+{
+    [DbContext(typeof(IdentityContext))]
+    partial class IdentityContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.4")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("AccountChatInstance", b =>
+                {
+                    b.Property<Guid>("AccountsId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("accounts_id");
+
+                    b.Property<Guid>("ChatInstancesId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("chat_instances_id");
+
+                    b.HasKey("AccountsId", "ChatInstancesId")
+                        .HasName("pk_account_chat_instance");
+
+                    b.HasIndex("ChatInstancesId")
+                        .HasDatabaseName("ix_account_chat_instance_chat_instances_id");
+
+                    b.ToTable("account_chat_instance", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Core.Database.Instance", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("PrivateKey")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("private_key");
+
+                    b.Property<string>("PublicKey")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("public_key");
+
+                    b.HasKey("Id")
+                        .HasName("pk_instance");
+
+                    b.ToTable("instance", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Account", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<string>("Avatar")
+                        .HasColumnType("text")
+                        .HasColumnName("avatar");
+
+                    b.Property<string>("Email")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("email");
+
+                    b.Property<string>("Password")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("password");
+
+                    b.Property<int>("Role")
+                        .HasColumnType("integer")
+                        .HasColumnName("role");
+
+                    b.Property<string>("Username")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("username");
+
+                    b.HasKey("Id")
+                        .HasName("pk_accounts");
+
+                    b.HasIndex("Email")
+                        .IsUnique()
+                        .HasDatabaseName("ix_accounts_email");
+
+                    b.HasIndex("Username")
+                        .IsUnique()
+                        .HasDatabaseName("ix_accounts_username");
+
+                    b.ToTable("accounts", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.ChatInstance", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<string>("BaseUrl")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("base_url");
+
+                    b.Property<string>("Domain")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("domain");
+
+                    b.Property<string>("PublicKey")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("public_key");
+
+                    b.Property<string>("Reason")
+                        .HasColumnType("text")
+                        .HasColumnName("reason");
+
+                    b.Property<int>("Status")
+                        .HasColumnType("integer")
+                        .HasColumnName("status");
+
+                    b.HasKey("Id")
+                        .HasName("pk_chat_instances");
+
+                    b.HasIndex("Domain")
+                        .IsUnique()
+                        .HasDatabaseName("ix_chat_instances_domain");
+
+                    b.ToTable("chat_instances", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.GuildAccount", b =>
+                {
+                    b.Property<Guid>("ChatInstanceId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("chat_instance_id");
+
+                    b.Property<string>("GuildId")
+                        .HasColumnType("text")
+                        .HasColumnName("guild_id");
+
+                    b.Property<Guid>("AccountId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("account_id");
+
+                    b.HasKey("ChatInstanceId", "GuildId", "AccountId")
+                        .HasName("pk_guild_accounts");
+
+                    b.HasIndex("AccountId")
+                        .HasDatabaseName("ix_guild_accounts_account_id");
+
+                    b.ToTable("guild_accounts", (string)null);
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Token", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<Guid>("AccountId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("account_id");
+
+                    b.HasKey("Id")
+                        .HasName("pk_tokens");
+
+                    b.HasIndex("AccountId")
+                        .HasDatabaseName("ix_tokens_account_id");
+
+                    b.ToTable("tokens", (string)null);
+                });
+
+            modelBuilder.Entity("AccountChatInstance", b =>
+                {
+                    b.HasOne("Foxchat.Identity.Database.Models.Account", null)
+                        .WithMany()
+                        .HasForeignKey("AccountsId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_account_chat_instance_accounts_accounts_id");
+
+                    b.HasOne("Foxchat.Identity.Database.Models.ChatInstance", null)
+                        .WithMany()
+                        .HasForeignKey("ChatInstancesId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_account_chat_instance_chat_instances_chat_instances_id");
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.GuildAccount", b =>
+                {
+                    b.HasOne("Foxchat.Identity.Database.Models.Account", "Account")
+                        .WithMany()
+                        .HasForeignKey("AccountId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_guild_accounts_accounts_account_id");
+
+                    b.HasOne("Foxchat.Identity.Database.Models.ChatInstance", "ChatInstance")
+                        .WithMany()
+                        .HasForeignKey("ChatInstanceId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_guild_accounts_chat_instances_chat_instance_id");
+
+                    b.Navigation("Account");
+
+                    b.Navigation("ChatInstance");
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Token", b =>
+                {
+                    b.HasOne("Foxchat.Identity.Database.Models.Account", "Account")
+                        .WithMany("Tokens")
+                        .HasForeignKey("AccountId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_tokens_accounts_account_id");
+
+                    b.Navigation("Account");
+                });
+
+            modelBuilder.Entity("Foxchat.Identity.Database.Models.Account", b =>
+                {
+                    b.Navigation("Tokens");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Foxchat.Identity/Program.cs

@@ -0,0 +1,55 @@
+using Newtonsoft.Json.Serialization;
+using Serilog;
+using Foxchat.Core;
+using Foxchat.Identity;
+using Foxchat.Identity.Database;
+using Foxchat.Identity.Services;
+
+var builder = WebApplication.CreateBuilder(args);
+
+var config = builder.AddConfiguration<InstanceConfig>("identity.ini");
+
+builder.Services.AddSerilog(config.LogEventLevel);
+
+await BuildInfo.ReadBuildInfo();
+Log.Information("Starting Foxchat.Identity {Version} ({Hash})", BuildInfo.Version, BuildInfo.Hash);
+
+builder.Services
+    .AddControllers()
+    .AddNewtonsoftJson(options =>
+        options.SerializerSettings.ContractResolver = new DefaultContractResolver
+        {
+            NamingStrategy = new SnakeCaseNamingStrategy()
+        });
+
+builder.Services
+    .AddCoreServices<IdentityContext>()
+    .AddScoped<ChatInstanceResolverService>()
+    .AddEndpointsApiExplorer()
+    .AddSwaggerGen();
+
+var app = builder.Build();
+
+app.UseSerilogRequestLogging();
+app.UseRouting();
+app.UseSwagger();
+app.UseSwaggerUI();
+app.UseCors();
+app.UseAuthentication();
+app.UseAuthorization();
+app.MapControllers();
+
+using (var scope = app.Services.CreateScope())
+using (var context = scope.ServiceProvider.GetRequiredService<IdentityContext>())
+{
+    Log.Information("Initializing instance keypair...");
+    if (await context.InitializeInstanceAsync())
+    {
+        Log.Information("Initialized instance keypair");
+    }
+}
+
+app.Urls.Clear();
+app.Urls.Add(config.Address);
+
+app.Run();

Foxchat.Identity/Services/ChatInstanceResolverService.cs

@@ -0,0 +1,39 @@
+using Foxchat.Core.Federation;
+using Foxchat.Core.Models;
+using Foxchat.Identity.Database;
+using Foxchat.Identity.Database.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Foxchat.Identity.Services;
+
+public class ChatInstanceResolverService(ILogger logger, RequestSigningService requestSigningService, IdentityContext context, InstanceConfig config)
+{
+    private readonly ILogger _logger = logger.ForContext<ChatInstanceResolverService>();
+
+    public async Task<ChatInstance> ResolveChatInstanceAsync(string domain)
+    {
+        var instance = await context.ChatInstances.Where(c => c.Domain == domain).FirstOrDefaultAsync();
+        if (instance != null) return instance;
+
+        _logger.Information("Unknown chat instance {Domain}, fetching its data", domain);
+
+        var resp = await requestSigningService.RequestAsync<HelloResponse>(
+            HttpMethod.Post,
+            domain, "/_fox/chat/hello",
+            userId: null,
+            body: new HelloRequest(config.Domain)
+        );
+
+        instance = new ChatInstance
+        {
+            Domain = domain,
+            BaseUrl = $"https://{domain}",
+            PublicKey = resp.PublicKey,
+            Status = ChatInstance.InstanceStatus.Active,
+        };
+        await context.AddAsync(instance);
+        await context.SaveChangesAsync();
+
+        return instance;
+    }
+}

Foxchat.Identity/identity.ini

@@ -0,0 +1,15 @@
+Host = localhost
+Port = 7611
+Domain = id.fox.localhost
+
+; The level to log things at. Valid settings: Verbose, Debug, Information, Warning, Error, Fatal
+LogEventLevel = Debug
+
+[Database]
+; The database URL in ADO.NET format.
+Url = "Host=localhost;Database=foxchat_cs_ident;Username=foxchat;Password=password"
+
+; The timeout for opening new connections. Defaults to 5.
+Timeout = 5
+; The maximum number of open connections. Defaults to 50.
+MaxPoolSize = 500