Refactor Games, support reading Rich Presences (#877)

* Add API-level support for Rich Presences

* Add library-level support for Game presences

* Add model conversions for outgoing+incoming rich presences

* Refactored Game into Activities

* Integrated Activities with user entities

rebase hell from 5f3cb947a92f4fd01cc4df47ca548180036b47f3

* Fix JSON converters for Activities

* Finish rebase, activity should be set on BaseSocketClient

* Use ApplicationId to define a rich presence

* Added SetActivityAsync to Base and Sharded Socket clients

* Remove public parameterless Game constructor

* Remove GameAssets, refactored to GameAsset

* Hide constructors for types that should be read-only

* Revert changes to Discord.Net.sln

got damned visual studio caching

* Refactor GameParty to use dedicated current/capacity values

Per feedback from @khionu

src/Discord.Net.Core/CDN.cs

@@ -22,6 +22,12 @@ namespace Discord
         public static string GetEmojiUrl(ulong emojiId)
             => $"{DiscordConfig.CDNUrl}emojis/{emojiId}.png";
 
+        public static string GetRichAssetUrl(ulong appId, string assetId, ushort size, ImageFormat format)
+        {
+            string extension = FormatToExtension(format, "");
+            return $"{DiscordConfig.CDNUrl}app-assets/{appId}/{assetId}.{extension}?size={size}";
+        }
+
         private static string FormatToExtension(ImageFormat format, string imageId)
         {
             if (format == ImageFormat.Auto)

src/Discord.Net.Core/Entities/Activities/Game.cs

@@ -0,0 +1,19 @@
+using System.Diagnostics;
+
+namespace Discord
+{
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    public class Game : IActivity
+    {
+        public string Name { get; internal set; }
+
+        internal Game() { }
+        public Game(string name)
+        {
+            Name = name;
+        }
+        
+        public override string ToString() => Name;
+        private string DebuggerDisplay => Name;
+    }
+}

src/Discord.Net.Core/Entities/Activities/GameAsset.cs

@@ -0,0 +1,15 @@
+namespace Discord
+{
+    public class GameAsset
+    {
+        internal GameAsset() { }
+
+        internal ulong ApplicationId { get; set; }
+        
+        public string Text { get; internal set; }
+        public string ImageId { get; internal set; }
+        
+        public string GetImageUrl(ImageFormat format = ImageFormat.Auto, ushort size = 128)
+            => CDN.GetRichAssetUrl(ApplicationId, ImageId, size, format);
+    }
+}

src/Discord.Net.Core/Entities/Activities/GameParty.cs

@@ -0,0 +1,11 @@
+namespace Discord
+{
+    public class GameParty
+    {
+        internal GameParty() { }
+
+        public string Id { get; internal set; }
+        public int Members { get; internal set; }
+        public int Capacity { get; internal set; }
+    }
+}

src/Discord.Net.Core/Entities/Activities/GameSecrets.cs

@@ -0,0 +1,16 @@
+namespace Discord
+{
+    public class GameSecrets
+    {
+        public string Match { get; }
+        public string Join { get; }
+        public string Spectate { get; }
+
+        internal GameSecrets(string match, string join, string spectate)
+        {
+            Match = match;
+            Join = join;
+            Spectate = spectate;
+        }
+    }
+}

src/Discord.Net.Core/Entities/Activities/GameTimestamps.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace Discord
+{
+    public class GameTimestamps
+    {
+        public DateTimeOffset? Start { get; }
+        public DateTimeOffset? End { get; }
+
+        internal GameTimestamps(DateTimeOffset? start, DateTimeOffset? end)
+        {
+            Start = start;
+            End = end;
+        }
+    }
+}

src/Discord.Net.Core/Entities/Activities/IActivity.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Discord
+{
+    public interface IActivity
+    {
+        string Name { get; }
+    }
+}

src/Discord.Net.Core/Entities/Activities/RichGame.cs

@@ -0,0 +1,22 @@
+using System.Diagnostics;
+
+namespace Discord
+{
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    public class RichGame : Game
+    {
+        internal RichGame() { }
+
+        public string Details { get; internal set;}
+        public string State { get; internal set;}
+        public ulong ApplicationId { get; internal set; }
+        public GameAsset SmallAsset { get; internal set; }
+        public GameAsset LargeAsset { get; internal set; }
+        public GameParty Party { get; internal set; }
+        public GameSecrets Secrets { get; internal set; }
+        public GameTimestamps Timestamps { get; internal set; }
+        
+        public override string ToString() => Name;
+        private string DebuggerDisplay => $"{Name} (Rich)";
+    }
+}

src/Discord.Net.Core/Entities/Activities/StreamingGame.cs

@@ -0,0 +1,21 @@
+using System.Diagnostics;
+
+namespace Discord
+{
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    public class StreamingGame : Game
+    {
+        public string Url { get; internal set; }
+        public StreamType StreamType { get; internal set; }
+
+        public StreamingGame(string name, string url, StreamType streamType)
+        {
+            Name = name;
+            Url = url;
+            StreamType = streamType;
+        }
+        
+        public override string ToString() => Name;
+        private string DebuggerDisplay => $"{Name} ({Url})";
+    }
+}

src/Discord.Net.Core/Entities/Users/Game.cs

@@ -1,24 +0,0 @@
-using System.Diagnostics;
-
-namespace Discord
-{
-    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
-    public struct Game
-    {
-        public string Name { get; }
-        public string StreamUrl { get; }
-        public StreamType StreamType { get; }
-
-        public Game(string name, string streamUrl, StreamType type)
-        {
-            Name = name;
-            StreamUrl = streamUrl;
-            StreamType = type;
-        }
-        private Game(string name)
-            : this(name, null, StreamType.NotStreaming) { }
-
-        public override string ToString() => Name;
-        private string DebuggerDisplay => StreamUrl != null ? $"{Name} ({StreamUrl})" : Name;
-    }
-}

src/Discord.Net.Core/Entities/Users/IPresence.cs

@@ -2,8 +2,8 @@
 {
     public interface IPresence
     {
-        /// <summary> Gets the game this user is currently playing, if any. </summary>
-        Game? Game { get; }
+        /// <summary> Gets the activity this user is currently doing. </summary>
+        IActivity Activity { get; }
         /// <summary> Gets the current status of this user. </summary>
         UserStatus Status { get; }
     }

src/Discord.Net.Rest/API/Common/Game.cs

@@ -13,6 +13,22 @@ namespace Discord.API
         public Optional<string> StreamUrl { get; set; }
         [JsonProperty("type")]
         public Optional<StreamType?> StreamType { get; set; }
+        [JsonProperty("details")]
+        public Optional<string> Details { get; set; }
+        [JsonProperty("state")]
+        public Optional<string> State { get; set; }
+        [JsonProperty("application_id")]
+        public Optional<ulong> ApplicationId { get; set; }
+        [JsonProperty("assets")]
+        public Optional<API.GameAssets> Assets { get; set; }
+        [JsonProperty("party")]
+        public Optional<API.GameParty> Party { get; set; }
+        [JsonProperty("secrets")]
+        public Optional<API.GameSecrets> Secrets { get; set; }
+        [JsonProperty("timestamps")]
+        public Optional<API.GameTimestamps> Timestamps { get; set; }
+        [JsonProperty("instance")]
+        public Optional<bool> Instance { get; set; }
 
         [OnError]
         internal void OnError(StreamingContext context, ErrorContext errorContext)

src/Discord.Net.Rest/API/Common/GameAssets.cs

@@ -0,0 +1,16 @@
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class GameAssets
+    {
+        [JsonProperty("small_text")]
+        public Optional<string> SmallText { get; set; }
+        [JsonProperty("small_image")]
+        public Optional<string> SmallImage { get; set; }
+        [JsonProperty("large_image")]
+        public Optional<string> LargeText { get; set; }
+        [JsonProperty("large_text")]
+        public Optional<string> LargeImage { get; set; }
+    }
+}

src/Discord.Net.Rest/API/Common/GameParty.cs

@@ -0,0 +1,12 @@
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class GameParty
+    {
+        [JsonProperty("id")]
+        public string Id { get; set; }
+        [JsonProperty("size")]
+        public int[] Size { get; set; }
+    }
+}

src/Discord.Net.Rest/API/Common/GameSecrets.cs

@@ -0,0 +1,14 @@
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class GameSecrets
+    {
+        [JsonProperty("match")]
+        public string Match { get; set; }
+        [JsonProperty("join")]
+        public string Join { get; set; }
+        [JsonProperty("spectate")]
+        public string Spectate { get; set; }
+    }
+}

src/Discord.Net.Rest/API/Common/GameTimestamps.cs

@@ -0,0 +1,15 @@
+using System;
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class GameTimestamps
+    {
+        [JsonProperty("start")]
+        [UnixTimestamp]
+        public Optional<DateTimeOffset> Start { get; set; }
+        [JsonProperty("end")]
+        [UnixTimestamp]
+        public Optional<DateTimeOffset> End { get; set; }
+    }
+}

src/Discord.Net.Rest/API/UnixTimestampAttribute.cs

@@ -0,0 +1,7 @@
+using System;
+
+namespace Discord.API
+{
+    [AttributeUsage(AttributeTargets.Property)]
+    internal class UnixTimestampAttribute : Attribute { }
+}

src/Discord.Net.Rest/Discord.Net.Rest.csproj

@@ -10,7 +10,8 @@
     <ProjectReference Include="..\Discord.Net.Core\Discord.Net.Core.csproj" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' != 'net45' ">
-    <PackageReference Include="System.Net.Http" Version="4.3.2" /> <!-- https://github.com/dotnet/corefx/issues/19535 -->
+    <PackageReference Include="System.Net.Http" Version="4.3.2" />
+    <!-- https://github.com/dotnet/corefx/issues/19535 -->
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
     <Reference Include="System.Net.Http" />

src/Discord.Net.Rest/Entities/Users/RestUser.cs

@@ -16,7 +16,7 @@ namespace Discord.Rest
         public DateTimeOffset CreatedAt => SnowflakeUtils.FromSnowflake(Id);
         public string Discriminator => DiscriminatorValue.ToString("D4");
         public string Mention => MentionUtils.MentionUser(Id);
-        public virtual Game? Game => null;
+        public virtual IActivity Activity => null;
         public virtual UserStatus Status => UserStatus.Offline;
         public virtual bool IsWebhook => false;
 

src/Discord.Net.Rest/Net/Converters/DiscordContractResolver.cs

@@ -66,6 +66,12 @@ namespace Discord.Net.Converters
                 if (type == typeof(ulong))
                     return UInt64Converter.Instance;
             }
+            bool hasUnixStamp = propInfo.GetCustomAttribute<UnixTimestampAttribute>() != null;
+            if (hasUnixStamp)
+            {
+                if (type == typeof(DateTimeOffset))
+                    return UnixTimestampConverter.Instance;
+            }
 
             //Enums
             if (type == typeof(PermissionTarget))

src/Discord.Net.Rest/Net/Converters/UnixTimestampConverter.cs

@@ -0,0 +1,28 @@
+using System;
+using Newtonsoft.Json;
+
+namespace Discord.Net.Converters
+{
+    public class UnixTimestampConverter : JsonConverter
+    {
+        public static readonly UnixTimestampConverter Instance = new UnixTimestampConverter();
+
+        public override bool CanConvert(Type objectType) => true;
+        public override bool CanRead => true;
+        public override bool CanWrite => true;
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            // Discord doesn't validate if timestamps contain decimals or not
+            if (reader.Value is double d)
+                return new DateTimeOffset(1970, 1, 1, 0, 0, 0, 0, TimeSpan.Zero).AddMilliseconds(d);
+            long offset = (long)reader.Value;
+            return new DateTimeOffset(1970, 1, 1, 0, 0, 0, 0, TimeSpan.Zero).AddMilliseconds(offset);
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

src/Discord.Net.Rpc/Entities/Users/RpcUser.cs

@@ -18,7 +18,7 @@ namespace Discord.Rpc
         public string Discriminator => DiscriminatorValue.ToString("D4");
         public string Mention => MentionUtils.MentionUser(Id);
         public virtual bool IsWebhook => false;
-        public virtual Game? Game => null;
+        public virtual IActivity Activity => null;
         public virtual UserStatus Status => UserStatus.Offline;
 
         internal RpcUser(DiscordRpcClient discord, ulong id)

src/Discord.Net.WebSocket/BaseSocketClient.cs

@@ -13,7 +13,7 @@ namespace Discord.WebSocket
         /// <summary> Gets the estimated round-trip latency, in milliseconds, to the gateway server. </summary>
         public abstract int Latency { get; protected set; }
         public abstract UserStatus Status { get; protected set; } 
-        public abstract Game? Game { get; protected set; }
+        public abstract IActivity Activity { get; protected set; }
 
         internal new DiscordSocketApiClient ApiClient => base.ApiClient as DiscordSocketApiClient;
 
@@ -45,6 +45,7 @@ namespace Discord.WebSocket
         public abstract Task StopAsync();
         public abstract Task SetStatusAsync(UserStatus status);
         public abstract Task SetGameAsync(string name, string streamUrl = null, StreamType streamType = StreamType.NotStreaming);
+        public abstract Task SetActivityAsync(IActivity activity);
         public abstract Task DownloadUsersAsync(IEnumerable<IGuild> guilds);  
 
         /// <inheritdoc />

src/Discord.Net.WebSocket/DiscordShardedClient.cs

@@ -22,7 +22,7 @@ namespace Discord.WebSocket
         /// <summary> Gets the estimated round-trip latency, in milliseconds, to the gateway server. </summary>
         public override int Latency { get => GetLatency(); protected set { } }
         public override UserStatus Status { get => _shards[0].Status; protected set { } }
-        public override Game? Game { get => _shards[0].Game; protected set { } }
+        public override IActivity Activity { get => _shards[0].Activity; protected set { } }
 
         internal new DiscordSocketApiClient ApiClient => base.ApiClient as DiscordSocketApiClient;
         public override IReadOnlyCollection<SocketGuild> Guilds => GetGuilds().ToReadOnlyCollection(() => GetGuildCount());
@@ -239,9 +239,18 @@ namespace Discord.WebSocket
                 await _shards[i].SetStatusAsync(status).ConfigureAwait(false);
         }
         public override async Task SetGameAsync(string name, string streamUrl = null, StreamType streamType = StreamType.NotStreaming)
+        {
+            IActivity activity = null;
+            if (streamUrl != null)
+                activity = new StreamingGame(name, streamUrl, streamType);
+            else if (name != null)
+                activity = new Game(name);
+            await SetActivityAsync(activity).ConfigureAwait(false);
+        }
+        public override async Task SetActivityAsync(IActivity activity)
         {
             for (int i = 0; i < _shards.Length; i++)
-                await _shards[i].SetGameAsync(name, streamUrl, streamType).ConfigureAwait(false);
+                await _shards[i].SetActivityAsync(activity).ConfigureAwait(false);
         }
 
         private void RegisterEvents(DiscordSocketClient client, bool isPrimary)

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -48,7 +48,7 @@ namespace Discord.WebSocket
         /// <inheritdoc />
         public override int Latency { get; protected set; }
         public override UserStatus Status { get; protected set; } = UserStatus.Online;
-        public override Game? Game { get; protected set; }
+        public override IActivity Activity { get; protected set; }
 
         //From DiscordSocketConfig
         internal int TotalShards { get; private set; }
@@ -328,33 +328,39 @@ namespace Discord.WebSocket
         }
         public override async Task SetGameAsync(string name, string streamUrl = null, StreamType streamType = StreamType.NotStreaming)
         {
-            if (name != null)
-                Game = new Game(name, streamUrl, streamType);
+            if (streamUrl != null)
+                Activity = new StreamingGame(name, streamUrl, streamType);
+            else if (name != null)
+                Activity = new Game(name);
             else
-                Game = null;
+                Activity = null;
             await SendStatusAsync().ConfigureAwait(false);
         }
+        public override async Task SetActivityAsync(IActivity activity)
+        {
+            Activity = activity;
+            await SendStatusAsync().ConfigureAwait(false);
+        }
+        
         private async Task SendStatusAsync()
         {
             if (CurrentUser == null)
                 return;
-            var game = Game;
+            var activity = Activity;
             var status = Status;
             var statusSince = _statusSince;
-            CurrentUser.Presence = new SocketPresence(status, game);
+            CurrentUser.Presence = new SocketPresence(status, activity);
 
-            GameModel gameModel;
-            if (game != null)
+            var gameModel = new GameModel();
+            // Discord only accepts rich presence over RPC, don't even bother building a payload
+            if (activity is RichGame game) throw new NotSupportedException("Outgoing Rich Presences are not supported");
+            if (activity is StreamingGame stream)
             {
-                gameModel = new API.Game
-                {
-                    Name = game.Value.Name,
-                    StreamType = game.Value.StreamType,
-                    StreamUrl = game.Value.StreamUrl
-                };
+                gameModel.StreamUrl = stream.Url;
+                gameModel.StreamType = stream.StreamType;
             }
-            else
-                gameModel = null;
+            else if (activity != null)
+                gameModel.Name = activity.Name;
 
             await ApiClient.SendStatusUpdateAsync(
                 status,

src/Discord.Net.WebSocket/Entities/Users/SocketPresence.cs

@@ -8,20 +8,20 @@ namespace Discord.WebSocket
     public struct SocketPresence : IPresence
     {
         public UserStatus Status { get; }
-        public Game? Game { get; }
+        public IActivity Activity { get; }
 
-        internal SocketPresence(UserStatus status, Game? game)
+        internal SocketPresence(UserStatus status, IActivity activity)
         {
             Status = status;
-            Game = game;
+            Activity= activity;
         }
         internal static SocketPresence Create(Model model)
         {
-            return new SocketPresence(model.Status, model.Game != null ? model.Game.ToEntity() : (Game?)null);
+            return new SocketPresence(model.Status, model.Game?.ToEntity());
         }
 
         public override string ToString() => Status.ToString();
-        private string DebuggerDisplay => $"{Status}{(Game != null ? $", {Game.Value.Name} ({Game.Value.StreamType})" : "")}";
+        private string DebuggerDisplay => $"{Status}{(Activity != null ? $", {Activity.Name}": "")}";
 
         internal SocketPresence Clone() => this;
     }

src/Discord.Net.WebSocket/Entities/Users/SocketUser.cs

@@ -18,7 +18,7 @@ namespace Discord.WebSocket
         public DateTimeOffset CreatedAt => SnowflakeUtils.FromSnowflake(Id);
         public string Discriminator => DiscriminatorValue.ToString("D4");
         public string Mention => MentionUtils.MentionUser(Id);
-        public Game? Game => Presence.Game;
+        public IActivity Activity => Presence.Activity;
         public UserStatus Status => Presence.Status;
 
         internal SocketUser(DiscordSocketClient discord, ulong id)

src/Discord.Net.WebSocket/Extensions/EntityExtensions.cs

@@ -2,11 +2,83 @@
 {
     internal static class EntityExtensions
     {
-        public static Game ToEntity(this API.Game model)
+        public static IActivity ToEntity(this API.Game model)
         {
-            return new Game(model.Name,
-                model.StreamUrl.GetValueOrDefault(null),
-                model.StreamType.GetValueOrDefault(null) ?? StreamType.NotStreaming);
+            // Rich Game
+            if (model.ApplicationId.IsSpecified)
+            {
+                ulong appId = model.ApplicationId.Value;
+                var assets = model.Assets.GetValueOrDefault()?.ToEntity(appId);
+                return new RichGame
+                {
+                    ApplicationId = appId,
+                    Name = model.Name,
+                    Details = model.Details.GetValueOrDefault(),
+                    State = model.State.GetValueOrDefault(),
+                    SmallAsset = assets?[0],
+                    LargeAsset = assets?[1],
+                    Party = model.Party.GetValueOrDefault()?.ToEntity(),
+                    Secrets = model.Secrets.GetValueOrDefault()?.ToEntity(),
+                    Timestamps = model.Timestamps.GetValueOrDefault()?.ToEntity()
+                };
+            }
+            // Stream Game
+            if (model.StreamUrl.IsSpecified)
+            {
+                return new StreamingGame(
+                    model.Name, 
+                    model.StreamUrl.Value, 
+                    model.StreamType.Value.GetValueOrDefault());
+            }
+            // Normal Game
+            return new Game(model.Name);
+        }
+
+        // (Small, Large)
+        public static GameAsset[] ToEntity(this API.GameAssets model, ulong appId)
+        {
+            return new GameAsset[]
+            {
+                model.SmallImage.IsSpecified ? new GameAsset
+                {
+                    ApplicationId = appId,
+                    ImageId = model.SmallImage.GetValueOrDefault(),
+                    Text = model.SmallText.GetValueOrDefault()
+                } : null,
+                model.LargeImage.IsSpecified ? new GameAsset
+                {
+                    ApplicationId = appId,
+                    ImageId = model.LargeImage.GetValueOrDefault(),
+                    Text = model.LargeText.GetValueOrDefault()
+                } : null,
+            };
+        }
+
+        public static GameParty ToEntity(this API.GameParty model)
+        {
+            // Discord will probably send bad data since they don't validate anything
+            int current = 0, cap = 0;
+            if (model.Size.Length == 2)
+            {
+                current = model.Size[0];
+                cap = model.Size[1];
+            }
+            return new GameParty
+            {
+                Id = model.Id,
+                Members = current,
+                Capacity = cap,
+            };
+        }
+
+        public static GameSecrets ToEntity(this API.GameSecrets model)
+        {
+            return new GameSecrets(model.Match, model.Join, model.Spectate);
+        }
+
+        public static GameTimestamps ToEntity(this API.GameTimestamps model)
+        {
+            return new GameTimestamps(model.Start.ToNullable(), model.End.ToNullable());
         }
     }
 }