feat(backend): start authentication controllers

.gitignore

@@ -1,3 +1,4 @@
 bin/
 obj/
 .version
+config.ini

Foxnouns.Backend/Config.cs

@@ -4,21 +4,28 @@ namespace Foxnouns.Backend;
 
 public class Config
 {
-    public string Host { get; set; } = "localhost";
-    public int Port { get; set; } = 3000;
-    public string BaseUrl { get; set; } = null!;
+    public string Host { get; init; } = "localhost";
+    public int Port { get; init; } = 3000;
+    public string BaseUrl { get; init; } = null!;
 
     public string Address => $"http://{Host}:{Port}";
 
-    public string? SeqLogUrl { get; set; }
-    public LogEventLevel LogEventLevel { get; set; } = LogEventLevel.Debug;
+    public string? SeqLogUrl { get; init; }
+    public LogEventLevel LogEventLevel { get; init; } = LogEventLevel.Debug;
 
-    public DatabaseConfig Database { get; set; } = new();
+    public DatabaseConfig Database { get; init; } = new();
+    public DiscordAuthConfig DiscordAuth { get; init; } = new();
 
     public class DatabaseConfig
     {
-        public string Url { get; set; } = string.Empty;
-        public int? Timeout { get; set; }
-        public int? MaxPoolSize { get; set; }
+        public string Url { get; init; } = string.Empty;
+        public int? Timeout { get; init; }
+        public int? MaxPoolSize { get; init; }
+    }
+
+    public class DiscordAuthConfig
+    {
+        public string? ClientId { get; init; }
+        public string? ClientSecret { get; init; }
     }
 }

Foxnouns.Backend/Controllers/Authentication/AuthController.cs

@@ -0,0 +1,38 @@
+using System.Web;
+using Foxnouns.Backend.Services;
+using Microsoft.AspNetCore.Mvc;
+using NodaTime;
+
+namespace Foxnouns.Backend.Controllers.Authentication;
+
+[Route("/api/v2/auth")]
+public class AuthController(Config config, KeyCacheService keyCacheSvc) : ApiControllerBase
+{   
+    [HttpPost("urls")]
+    [ProducesResponseType(StatusCodes.Status200OK, Type = typeof(UrlsResponse))]
+    public async Task<IActionResult> UrlsAsync()
+    {
+        var state = HttpUtility.UrlEncode(await keyCacheSvc.GenerateAuthStateAsync());
+        string? discord = null;
+        if (config.DiscordAuth.ClientId != null && config.DiscordAuth.ClientSecret != null)
+            discord =
+                $"https://discord.com/oauth2/authorize?response_type=code" +
+                $"&client_id={config.DiscordAuth.ClientId}&scope=identify" +
+                $"&prompt=none&state={state}" +
+                $"&redirect_uri={HttpUtility.UrlEncode($"{config.BaseUrl}/auth/login/discord")}";
+
+        return Ok(new UrlsResponse(discord, null, null));
+    }
+
+    private record UrlsResponse(
+        string? Discord,
+        string? Google,
+        string? Tumblr
+    );
+
+    internal record AuthResponse(
+        UserRendererService.UserResponse User,
+        string Token,
+        Instant ExpiresAt
+    );
+}

Foxnouns.Backend/Controllers/Authentication/DiscordAuthController.cs

@@ -6,9 +6,11 @@ namespace Foxnouns.Backend.Controllers.Authentication;
 [Route("/api/v2/auth/discord")]
 public class DiscordAuthController(Config config, DatabaseContext db) : ApiControllerBase
 {
-    [HttpPost("url")]
-    public async Task<IActionResult> AuthenticationUrl()
+    private void CheckRequirements()
     {
-        throw new NotImplementedException();
+        if (config.DiscordAuth.ClientId == null || config.DiscordAuth.ClientSecret == null)
+        {
+            throw new ApiError.BadRequest("Discord authentication is not enabled on this instance.");
+        }
     }
 }

Foxnouns.Backend/Controllers/Authentication/EmailAuthController.cs

@@ -0,0 +1,31 @@
+using Foxnouns.Backend.Database;
+using Foxnouns.Backend.Services;
+using Microsoft.AspNetCore.Mvc;
+using NodaTime;
+
+namespace Foxnouns.Backend.Controllers.Authentication;
+
+[Route("/api/v2/auth/email")]
+public class EmailAuthController(DatabaseContext db, AuthService authSvc, UserRendererService userRendererSvc, IClock clock, ILogger logger) : ApiControllerBase
+{
+    [HttpPost("login")]
+    public async Task<IActionResult> LoginAsync([FromBody] LoginRequest req)
+    {
+        var user = await authSvc.AuthenticateUserAsync(req.Email, req.Password);
+        var frontendApp = await db.GetFrontendApplicationAsync();
+        
+        var (tokenStr, token) =
+            authSvc.GenerateToken(user, frontendApp, ["*"], clock.GetCurrentInstant() + Duration.FromDays(365));
+        db.Add(token);
+
+        await db.SaveChangesAsync();
+
+        return Ok(new AuthController.AuthResponse(
+            await userRendererSvc.RenderUserAsync(user, selfUser: user, renderMembers: false),
+            tokenStr,
+            token.ExpiresAt
+        ));
+    }
+
+    public record LoginRequest(string Email, string Password);
+}

Foxnouns.Backend/Controllers/DebugController.cs

@@ -10,7 +10,7 @@ public class DebugController(DatabaseContext db, AuthService authSvc, IClock clo
 {
     [HttpPost("users")]
     [ProducesResponseType(StatusCodes.Status200OK, Type = typeof(AuthResponse))]
-    public async Task<IActionResult> CreateUser([FromBody] CreateUserRequest req)
+    public async Task<IActionResult> CreateUserAsync([FromBody] CreateUserRequest req)
     {
         logger.Debug("Creating user with username {Username} and email {Email}", req.Username, req.Email);
 

Foxnouns.Backend/Database/Migrations/20240611225328_AddTemporaryKeyCache.Designer.cs

@@ -0,0 +1,511 @@
+// <auto-generated />
+using Foxnouns.Backend.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using NodaTime;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace Foxnouns.Backend.Database.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    [Migration("20240611225328_AddTemporaryKeyCache")]
+    partial class AddTemporaryKeyCache
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.5")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.Application", b =>
+                {
+                    b.Property<long>("Id")
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    b.Property<string>("ClientId")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("client_id");
+
+                    b.Property<string>("ClientSecret")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("client_secret");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("name");
+
+                    b.Property<string[]>("RedirectUris")
+                        .IsRequired()
+                        .HasColumnType("text[]")
+                        .HasColumnName("redirect_uris");
+
+                    b.Property<string[]>("Scopes")
+                        .IsRequired()
+                        .HasColumnType("text[]")
+                        .HasColumnName("scopes");
+
+                    b.HasKey("Id")
+                        .HasName("pk_applications");
+
+                    b.ToTable("applications", (string)null);
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.AuthMethod", b =>
+                {
+                    b.Property<long>("Id")
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    b.Property<int>("AuthType")
+                        .HasColumnType("integer")
+                        .HasColumnName("auth_type");
+
+                    b.Property<long?>("FediverseApplicationId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("fediverse_application_id");
+
+                    b.Property<string>("RemoteId")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("remote_id");
+
+                    b.Property<string>("RemoteUsername")
+                        .HasColumnType("text")
+                        .HasColumnName("remote_username");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("user_id");
+
+                    b.HasKey("Id")
+                        .HasName("pk_auth_methods");
+
+                    b.HasIndex("FediverseApplicationId")
+                        .HasDatabaseName("ix_auth_methods_fediverse_application_id");
+
+                    b.HasIndex("UserId")
+                        .HasDatabaseName("ix_auth_methods_user_id");
+
+                    b.ToTable("auth_methods", (string)null);
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.FediverseApplication", b =>
+                {
+                    b.Property<long>("Id")
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    b.Property<string>("ClientId")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("client_id");
+
+                    b.Property<string>("ClientSecret")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("client_secret");
+
+                    b.Property<string>("Domain")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("domain");
+
+                    b.Property<int>("InstanceType")
+                        .HasColumnType("integer")
+                        .HasColumnName("instance_type");
+
+                    b.HasKey("Id")
+                        .HasName("pk_fediverse_applications");
+
+                    b.ToTable("fediverse_applications", (string)null);
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.Member", b =>
+                {
+                    b.Property<long>("Id")
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    b.Property<string>("Avatar")
+                        .HasColumnType("text")
+                        .HasColumnName("avatar");
+
+                    b.Property<string>("Bio")
+                        .HasColumnType("text")
+                        .HasColumnName("bio");
+
+                    b.Property<string>("DisplayName")
+                        .HasColumnType("text")
+                        .HasColumnName("display_name");
+
+                    b.Property<string[]>("Links")
+                        .IsRequired()
+                        .HasColumnType("text[]")
+                        .HasColumnName("links");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("name");
+
+                    b.Property<bool>("Unlisted")
+                        .HasColumnType("boolean")
+                        .HasColumnName("unlisted");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("user_id");
+
+                    b.HasKey("Id")
+                        .HasName("pk_members");
+
+                    b.HasIndex("UserId", "Name")
+                        .IsUnique()
+                        .HasDatabaseName("ix_members_user_id_name");
+
+                    b.ToTable("members", (string)null);
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.TemporaryKey", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("Expires")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("expires");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("key");
+
+                    b.Property<string>("Value")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("value");
+
+                    b.HasKey("Id")
+                        .HasName("pk_temporary_keys");
+
+                    b.HasIndex("Key")
+                        .IsUnique()
+                        .HasDatabaseName("ix_temporary_keys_key");
+
+                    b.ToTable("temporary_keys", (string)null);
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.Token", b =>
+                {
+                    b.Property<long>("Id")
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    b.Property<long>("ApplicationId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("application_id");
+
+                    b.Property<Instant>("ExpiresAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("expires_at");
+
+                    b.Property<byte[]>("Hash")
+                        .IsRequired()
+                        .HasColumnType("bytea")
+                        .HasColumnName("hash");
+
+                    b.Property<bool>("ManuallyExpired")
+                        .HasColumnType("boolean")
+                        .HasColumnName("manually_expired");
+
+                    b.Property<string[]>("Scopes")
+                        .IsRequired()
+                        .HasColumnType("text[]")
+                        .HasColumnName("scopes");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("user_id");
+
+                    b.HasKey("Id")
+                        .HasName("pk_tokens");
+
+                    b.HasIndex("ApplicationId")
+                        .HasDatabaseName("ix_tokens_application_id");
+
+                    b.HasIndex("UserId")
+                        .HasDatabaseName("ix_tokens_user_id");
+
+                    b.ToTable("tokens", (string)null);
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.User", b =>
+                {
+                    b.Property<long>("Id")
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    b.Property<string>("Avatar")
+                        .HasColumnType("text")
+                        .HasColumnName("avatar");
+
+                    b.Property<string>("Bio")
+                        .HasColumnType("text")
+                        .HasColumnName("bio");
+
+                    b.Property<string>("DisplayName")
+                        .HasColumnType("text")
+                        .HasColumnName("display_name");
+
+                    b.Property<string[]>("Links")
+                        .IsRequired()
+                        .HasColumnType("text[]")
+                        .HasColumnName("links");
+
+                    b.Property<bool>("ListHidden")
+                        .HasColumnType("boolean")
+                        .HasColumnName("list_hidden");
+
+                    b.Property<string>("MemberTitle")
+                        .HasColumnType("text")
+                        .HasColumnName("member_title");
+
+                    b.Property<string>("Password")
+                        .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_users");
+
+                    b.HasIndex("Username")
+                        .IsUnique()
+                        .HasDatabaseName("ix_users_username");
+
+                    b.ToTable("users", (string)null);
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.AuthMethod", b =>
+                {
+                    b.HasOne("Foxnouns.Backend.Database.Models.FediverseApplication", "FediverseApplication")
+                        .WithMany()
+                        .HasForeignKey("FediverseApplicationId")
+                        .HasConstraintName("fk_auth_methods_fediverse_applications_fediverse_application_id");
+
+                    b.HasOne("Foxnouns.Backend.Database.Models.User", "User")
+                        .WithMany("AuthMethods")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_auth_methods_users_user_id");
+
+                    b.Navigation("FediverseApplication");
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.Member", b =>
+                {
+                    b.HasOne("Foxnouns.Backend.Database.Models.User", "User")
+                        .WithMany("Members")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_members_users_user_id");
+
+                    b.OwnsOne("System.Collections.Generic.List<Foxnouns.Backend.Database.Models.Field>", "Fields", b1 =>
+                        {
+                            b1.Property<long>("MemberId")
+                                .HasColumnType("bigint");
+
+                            b1.Property<int>("Capacity")
+                                .HasColumnType("integer");
+
+                            b1.HasKey("MemberId");
+
+                            b1.ToTable("members");
+
+                            b1.ToJson("fields");
+
+                            b1.WithOwner()
+                                .HasForeignKey("MemberId")
+                                .HasConstraintName("fk_members_members_id");
+                        });
+
+                    b.OwnsOne("System.Collections.Generic.List<Foxnouns.Backend.Database.Models.FieldEntry>", "Names", b1 =>
+                        {
+                            b1.Property<long>("MemberId")
+                                .HasColumnType("bigint");
+
+                            b1.Property<int>("Capacity")
+                                .HasColumnType("integer");
+
+                            b1.HasKey("MemberId");
+
+                            b1.ToTable("members");
+
+                            b1.ToJson("names");
+
+                            b1.WithOwner()
+                                .HasForeignKey("MemberId")
+                                .HasConstraintName("fk_members_members_id");
+                        });
+
+                    b.OwnsOne("System.Collections.Generic.List<Foxnouns.Backend.Database.Models.Pronoun>", "Pronouns", b1 =>
+                        {
+                            b1.Property<long>("MemberId")
+                                .HasColumnType("bigint");
+
+                            b1.Property<int>("Capacity")
+                                .HasColumnType("integer");
+
+                            b1.HasKey("MemberId");
+
+                            b1.ToTable("members");
+
+                            b1.ToJson("pronouns");
+
+                            b1.WithOwner()
+                                .HasForeignKey("MemberId")
+                                .HasConstraintName("fk_members_members_id");
+                        });
+
+                    b.Navigation("Fields")
+                        .IsRequired();
+
+                    b.Navigation("Names")
+                        .IsRequired();
+
+                    b.Navigation("Pronouns")
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.Token", b =>
+                {
+                    b.HasOne("Foxnouns.Backend.Database.Models.Application", "Application")
+                        .WithMany()
+                        .HasForeignKey("ApplicationId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_tokens_applications_application_id");
+
+                    b.HasOne("Foxnouns.Backend.Database.Models.User", "User")
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_tokens_users_user_id");
+
+                    b.Navigation("Application");
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.User", b =>
+                {
+                    b.OwnsOne("Foxnouns.Backend.Database.Models.User.Fields#List", "Fields", b1 =>
+                        {
+                            b1.Property<long>("UserId")
+                                .HasColumnType("bigint");
+
+                            b1.Property<int>("Capacity")
+                                .HasColumnType("integer");
+
+                            b1.HasKey("UserId")
+                                .HasName("pk_users");
+
+                            b1.ToTable("users");
+
+                            b1.ToJson("fields");
+
+                            b1.WithOwner()
+                                .HasForeignKey("UserId")
+                                .HasConstraintName("fk_users_users_user_id");
+                        });
+
+                    b.OwnsOne("Foxnouns.Backend.Database.Models.User.Names#List", "Names", b1 =>
+                        {
+                            b1.Property<long>("UserId")
+                                .HasColumnType("bigint");
+
+                            b1.Property<int>("Capacity")
+                                .HasColumnType("integer");
+
+                            b1.HasKey("UserId")
+                                .HasName("pk_users");
+
+                            b1.ToTable("users");
+
+                            b1.ToJson("names");
+
+                            b1.WithOwner()
+                                .HasForeignKey("UserId")
+                                .HasConstraintName("fk_users_users_user_id");
+                        });
+
+                    b.OwnsOne("Foxnouns.Backend.Database.Models.User.Pronouns#List", "Pronouns", b1 =>
+                        {
+                            b1.Property<long>("UserId")
+                                .HasColumnType("bigint");
+
+                            b1.Property<int>("Capacity")
+                                .HasColumnType("integer");
+
+                            b1.HasKey("UserId")
+                                .HasName("pk_users");
+
+                            b1.ToTable("users");
+
+                            b1.ToJson("pronouns");
+
+                            b1.WithOwner()
+                                .HasForeignKey("UserId")
+                                .HasConstraintName("fk_users_users_user_id");
+                        });
+
+                    b.Navigation("Fields")
+                        .IsRequired();
+
+                    b.Navigation("Names")
+                        .IsRequired();
+
+                    b.Navigation("Pronouns")
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.User", b =>
+                {
+                    b.Navigation("AuthMethods");
+
+                    b.Navigation("Members");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Foxnouns.Backend/Database/Migrations/20240611225328_AddTemporaryKeyCache.cs

@@ -0,0 +1,44 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+using NodaTime;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace Foxnouns.Backend.Database.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddTemporaryKeyCache : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "temporary_keys",
+                columns: table => new
+                {
+                    id = table.Column<long>(type: "bigint", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    key = table.Column<string>(type: "text", nullable: false),
+                    value = table.Column<string>(type: "text", nullable: false),
+                    expires = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_temporary_keys", x => x.id);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "ix_temporary_keys_key",
+                table: "temporary_keys",
+                column: "key",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "temporary_keys");
+        }
+    }
+}

Foxnouns.Backend/Database/Migrations/DatabaseContextModelSnapshot.cs

@@ -175,6 +175,39 @@ namespace Foxnouns.Backend.Database.Migrations
                     b.ToTable("members", (string)null);
                 });
 
+            modelBuilder.Entity("Foxnouns.Backend.Database.Models.TemporaryKey", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<Instant>("Expires")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("expires");
+
+                    b.Property<string>("Key")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("key");
+
+                    b.Property<string>("Value")
+                        .IsRequired()
+                        .HasColumnType("text")
+                        .HasColumnName("value");
+
+                    b.HasKey("Id")
+                        .HasName("pk_temporary_keys");
+
+                    b.HasIndex("Key")
+                        .IsUnique()
+                        .HasDatabaseName("ix_temporary_keys_key");
+
+                    b.ToTable("temporary_keys", (string)null);
+                });
+
             modelBuilder.Entity("Foxnouns.Backend.Database.Models.Token", b =>
                 {
                     b.Property<long>("Id")

Foxnouns.Backend/Extensions/WebApplicationExtensions.cs

@@ -66,7 +66,8 @@ public static class WebApplicationExtensions
         .AddSnowflakeGenerator()
         .AddScoped<UserRendererService>()
         .AddScoped<MemberRendererService>()
-        .AddScoped<AuthService>();
+        .AddScoped<AuthService>()
+        .AddScoped<KeyCacheService>();
 
     public static IServiceCollection AddCustomMiddleware(this IServiceCollection services) => services
         .AddScoped<ErrorHandlerMiddleware>()

Foxnouns.Backend/Program.cs

@@ -2,9 +2,11 @@ using Foxnouns.Backend;
 using Foxnouns.Backend.Database;
 using Serilog;
 using Foxnouns.Backend.Extensions;
+using Foxnouns.Backend.Services;
 using Microsoft.AspNetCore.Mvc;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
+using NodaTime;
 
 // Read version information from .version in the repository root
 await BuildInfo.ReadBuildInfo();
@@ -60,6 +62,23 @@ app.MapControllers();
 app.Urls.Clear();
 app.Urls.Add(config.Address);
 
-app.Run();
+// Fire off the periodic tasks loop in the background
+_ = new Timer(_ =>
+{
+    var __ = RunPeriodicTasksAsync();
+}, null, TimeSpan.FromSeconds(30), TimeSpan.FromMinutes(1));
 
-Log.CloseAndFlush();
+app.Run();
+Log.CloseAndFlush();
+
+return;
+
+async Task RunPeriodicTasksAsync()
+{
+    await using var scope = app.Services.CreateAsyncScope();
+    var logger = scope.ServiceProvider.GetRequiredService<ILogger>();
+    logger.Debug("Running periodic tasks");
+
+    var keyCacheSvc = scope.ServiceProvider.GetRequiredService<KeyCacheService>();
+    await keyCacheSvc.DeleteExpiredKeysAsync();
+}

Foxnouns.Backend/Services/AuthService.cs

@@ -3,6 +3,7 @@ using Foxnouns.Backend.Database;
 using Foxnouns.Backend.Database.Models;
 using Foxnouns.Backend.Utils;
 using Microsoft.AspNetCore.Identity;
+using Microsoft.EntityFrameworkCore;
 using NodaTime;
 
 namespace Foxnouns.Backend.Services;
@@ -30,6 +31,23 @@ public class AuthService(ILogger logger, DatabaseContext db, ISnowflakeGenerator
         return user;
     }
 
+    public async Task<User> AuthenticateUserAsync(string email, string password)
+    {
+        var user = await db.Users.FirstOrDefaultAsync(u => u.AuthMethods.Any(a => a.AuthType == AuthType.Email && a.RemoteId == email));
+        if (user == null) throw new ApiError.NotFound("No user with that email address found, or password is incorrect");
+        
+        var pwResult = await Task.Run(() => _passwordHasher.VerifyHashedPassword(user, user.Password!, password));
+        if (pwResult == PasswordVerificationResult.Failed)
+            throw new ApiError.NotFound("No user with that email address found, or password is incorrect");
+        if (pwResult == PasswordVerificationResult.SuccessRehashNeeded)
+        {
+            user.Password = await Task.Run(() => _passwordHasher.HashPassword(user, password));
+            await db.SaveChangesAsync();
+        }
+
+        return user;
+    }
+
     public (string, Token) GenerateToken(User user, Application application, string[] scopes, Instant expires)
     {
         if (!OauthUtils.ValidateScopes(application, scopes))

Foxnouns.Backend/Services/KeyCacheService.cs

@@ -0,0 +1,51 @@
+using Foxnouns.Backend.Database;
+using Foxnouns.Backend.Database.Models;
+using Foxnouns.Backend.Utils;
+using Microsoft.EntityFrameworkCore;
+using NodaTime;
+
+namespace Foxnouns.Backend.Services;
+
+public class KeyCacheService(DatabaseContext db, IClock clock, ILogger logger)
+{
+    public Task SetKeyAsync(string key, string value, Duration expireAfter) =>
+        db.SetKeyAsync(key, value, clock.GetCurrentInstant() + expireAfter);
+
+    public async Task SetKeyAsync(string key, string value, Instant expires)
+    {
+        db.TemporaryKeys.Add(new TemporaryKey
+        {
+            Expires = expires,
+            Key = key,
+            Value = value,
+        });
+        await db.SaveChangesAsync();
+    }
+
+    public async Task<string?> GetKeyAsync(string key, bool delete = false)
+    {
+        var value = await db.TemporaryKeys.FirstOrDefaultAsync(k => k.Key == key);
+        if (value == null) return null;
+
+        if (delete)
+        {
+            await db.TemporaryKeys.Where(k => k.Key == key).ExecuteDeleteAsync();
+            await db.SaveChangesAsync();
+        }
+
+        return value.Value;
+    }
+
+    public async Task DeleteExpiredKeysAsync()
+    {
+        var count = await db.TemporaryKeys.Where(k => k.Expires < clock.GetCurrentInstant()).ExecuteDeleteAsync();
+        if (count != 0) logger.Information("Removed {Count} expired keys from the database", count);
+    }
+
+    public async Task<string> GenerateAuthStateAsync()
+    {
+        var state = OauthUtils.RandomToken();
+        await SetKeyAsync($"oauth_state:{state}", "", Duration.FromMinutes(10));
+        return state;
+    }
+}

Foxnouns.Backend/Services/UserRendererService.cs

@@ -7,7 +7,7 @@ namespace Foxnouns.Backend.Services;
 
 public class UserRendererService(DatabaseContext db, MemberRendererService memberRendererService)
 {
-    public async Task<object> RenderUserAsync(User user, User? selfUser = null, bool renderMembers = true)
+    public async Task<UserResponse> RenderUserAsync(User user, User? selfUser = null, bool renderMembers = true)
     {
         renderMembers = renderMembers && (!user.ListHidden || selfUser?.Id == user.Id);
 

Foxnouns.Backend/config.example.ini

@@ -18,3 +18,7 @@ Url = "Host=localhost;Database=foxnouns_net;Username=pronouns;Password=pronouns"
 Timeout = 5
 ; The maximum number of open connections. Defaults to 50.
 MaxPoolSize = 50
+
+[DiscordAuth]
+ClientId = <clientIdHere>
+ClientSecret = <clientSecretHere>