Add Meta authentication secret and SHA256 hashing

src/RecNet.Application/Common/Security/Hashing.cs

@@ -0,0 +1,19 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace RecNet.Application.Common.Security;
+
+public static class Hashing
+{
+    public static byte[] ComputeSha256(string input)
+        => SHA256.HashData(Encoding.UTF8.GetBytes(input));
+
+    public static bool VerifySha256(string input, byte[] expectedHash)
+    {
+        var computedHash = ComputeSha256(input);
+
+        return CryptographicOperations.FixedTimeEquals(
+            computedHash,
+            expectedHash);
+    }
+}

src/RecNet.Application/Profiles/ProfileService.cs

@@ -1,5 +1,7 @@
 using AutoMapper;
 using RecNet.Application.Common.Interfaces;
+using RecNet.Application.Common.Security;
+using RecNet.Domain.Common;
 using RecNet.Domain.GameVersions;
 using RecNet.Domain.Profiles;
 using ProfileEntity = RecNet.Domain.Profiles.Profile;
@@ -130,9 +132,15 @@ public class ProfileService(
                 command.PlatformType,
                 command.PlatformId);
 
+            if (command.PlatformType == PlatformType.Meta)
+                profile.SetMetaAuthenticationSecret(Hashing.ComputeSha256(command.PlatformAuthentication));
+
             await profileRepository.AddAsync(profile, ct);
         }
 
+        if (command.PlatformType == PlatformType.Meta && !Hashing.VerifySha256(command.PlatformAuthentication, profile.MetaAuthenticationSecret))
+            return LoginProfileResult.Fail("Platform Auth Failed: Invalid authentication");
+
         if (profile.IsBanned)
             return LoginProfileResult.Fail("Profile is banned");
 

src/RecNet.Domain/Profiles/Profile.cs

@@ -28,6 +28,7 @@ public class Profile
     public PlatformType Platform { get; private set; }
     public string PlatformId { get; private set; }
     public List<string> DeviceIds { get; private set; } = [];
+    public byte[] MetaAuthenticationSecret { get; private set; } = [];
 
     // EZ
     public bool IsBanned { get; private set; }
@@ -64,6 +65,9 @@ public class Profile
         DeviceIds.Add(deviceId);
     }
     
+    public void SetMetaAuthenticationSecret(byte[] metaAuthenticationSecret)
+        => MetaAuthenticationSecret = metaAuthenticationSecret;
+
     public void RecordSuccessfulLogin(string deviceId, string? platformName)
     {
         if (!string.IsNullOrWhiteSpace(platformName) && Name != platformName)

src/RecNet.Infrastructure/Persistence/Migrations/20260621202709_MetaAuthenticationSecret.Designer.cs

@@ -0,0 +1,168 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using RecNet.Infrastructure.Persistence;
+
+#nullable disable
+
+namespace RecNet.Infrastructure.Persistence.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    [Migration("20260621202709_MetaAuthenticationSecret")]
+    partial class MetaAuthenticationSecret
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "10.0.8")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("RecNet.Domain.Configuration.ServerConfig", b =>
+                {
+                    b.Property<string>("Key")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("Value")
+                        .IsRequired()
+                        .HasColumnType("jsonb");
+
+                    b.HasKey("Key");
+
+                    b.ToTable("ServerConfigs");
+                });
+
+            modelBuilder.Entity("RecNet.Domain.GameVersions.GameVersion", b =>
+                {
+                    b.Property<string>("Version")
+                        .HasMaxLength(32)
+                        .HasColumnType("character varying(32)");
+
+                    b.Property<bool>("IsValid")
+                        .HasColumnType("boolean");
+
+                    b.HasKey("Version");
+
+                    b.ToTable("GameVersions");
+                });
+
+            modelBuilder.Entity("RecNet.Domain.Profiles.PlayerSetting", b =>
+                {
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Key")
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)");
+
+                    b.Property<string>("Value")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("UserId", "Key");
+
+                    b.ToTable("PlayerSettings");
+                });
+
+            modelBuilder.Entity("RecNet.Domain.Profiles.Profile", b =>
+                {
+                    b.Property<Guid>("ProfileId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.PrimitiveCollection<string>("DeviceIds")
+                        .IsRequired()
+                        .HasColumnType("jsonb");
+
+                    b.Property<bool>("IsBanned")
+                        .HasColumnType("boolean");
+
+                    b.Property<bool>("IsModerator")
+                        .HasColumnType("boolean");
+
+                    b.Property<byte[]>("MetaAuthenticationSecret")
+                        .IsRequired()
+                        .HasColumnType("bytea");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(32)
+                        .HasColumnType("character varying(32)");
+
+                    b.Property<string>("Platform")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<string>("PlatformId")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.HasKey("ProfileId");
+
+                    b.HasIndex("Platform", "PlatformId")
+                        .IsUnique();
+
+                    b.ToTable("Profiles");
+                });
+
+            modelBuilder.Entity("RecNet.Domain.Profiles.PlayerSetting", b =>
+                {
+                    b.HasOne("RecNet.Domain.Profiles.Profile", null)
+                        .WithMany("Settings")
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("RecNet.Domain.Profiles.Profile", b =>
+                {
+                    b.OwnsOne("RecNet.Domain.Profiles.Avatar", "Avatar", b1 =>
+                        {
+                            b1.Property<Guid>("ProfileId")
+                                .HasColumnType("uuid");
+
+                            b1.Property<string>("HairColor")
+                                .IsRequired()
+                                .HasColumnType("text");
+
+                            b1.Property<string>("OutfitSelections")
+                                .IsRequired()
+                                .HasColumnType("text");
+
+                            b1.Property<string>("SkinColor")
+                                .IsRequired()
+                                .HasColumnType("text");
+
+                            b1.HasKey("ProfileId");
+
+                            b1.ToTable("Profiles");
+
+                            b1.WithOwner()
+                                .HasForeignKey("ProfileId");
+                        });
+
+                    b.Navigation("Avatar")
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("RecNet.Domain.Profiles.Profile", b =>
+                {
+                    b.Navigation("Settings");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

src/RecNet.Infrastructure/Persistence/Migrations/20260621202709_MetaAuthenticationSecret.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace RecNet.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class MetaAuthenticationSecret : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<byte[]>(
+                name: "MetaAuthenticationSecret",
+                table: "Profiles",
+                type: "bytea",
+                nullable: false,
+                defaultValue: new byte[0]);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "MetaAuthenticationSecret",
+                table: "Profiles");
+        }
+    }
+}

src/RecNet.Infrastructure/Persistence/Migrations/DatabaseContextModelSnapshot.cs

@@ -88,6 +88,10 @@ namespace RecNet.Infrastructure.Persistence.Migrations
                     b.Property<bool>("IsModerator")
                         .HasColumnType("boolean");
 
+                    b.Property<byte[]>("MetaAuthenticationSecret")
+                        .IsRequired()
+                        .HasColumnType("bytea");
+
                     b.Property<string>("Name")
                         .IsRequired()
                         .HasMaxLength(32)

src/RecNet.Infrastructure/Services/Meta/MetaAuthValidator.cs

@@ -9,7 +9,9 @@ public class MetaAuthValidator : IPlatformAuthValidator
     public PlatformType PlatformType 
         => PlatformType.Meta;
 
-    public Task<PlatformAuthResult> ValidateAsync(string platformAuthentication, string platformId,
+    public Task<PlatformAuthResult> ValidateAsync(
+        string platformAuthentication, 
+        string platformId,
         CancellationToken ct = default)
-        => Task.FromResult(PlatformAuthResult.Success(null)); // TODO: Implement
+        => Task.FromResult(PlatformAuthResult.Success(null)); // We have a custom flow that utilizes platformAuthentication for Meta, so this gets skipped.
 }