feature: Add stickers (#1726)

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

@@ -58,5 +58,7 @@ namespace Discord.API
         public Optional<AllowedMentions> AllowedMentions { get; set; }
         [JsonProperty("referenced_message")]
         public Optional<Message> ReferencedMessage { get; set; }
+        [JsonProperty("stickers")]
+        public Optional<Sticker[]> Stickers { get; set; }
     }
 }

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

@@ -0,0 +1,25 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class Sticker
+    {
+        [JsonProperty("id")]
+        public ulong Id { get; set; }
+        [JsonProperty("pack_id")]
+        public ulong PackId { get; set; }
+        [JsonProperty("name")]
+        public string Name { get; set; }
+        [JsonProperty("description")]
+        public string Desription { get; set; }
+        [JsonProperty("tags")]
+        public Optional<string> Tags { get; set; }
+        [JsonProperty("asset")]
+        public string Asset { get; set; }
+        [JsonProperty("preview_asset")]
+        public string PreviewAsset { get; set; }
+        [JsonProperty("format_type")]
+        public StickerFormatType FormatType { get; set; }
+    }
+}

src/Discord.Net.Rest/Entities/Messages/RestMessage.cs

@@ -58,6 +58,8 @@ namespace Discord.Rest
         public virtual IReadOnlyCollection<RestUser> MentionedUsers => ImmutableArray.Create<RestUser>();
         /// <inheritdoc />
         public virtual IReadOnlyCollection<ITag> Tags => ImmutableArray.Create<ITag>();
+        /// <inheritdoc />
+        public virtual IReadOnlyCollection<Sticker> Stickers => ImmutableArray.Create<Sticker>();
 
         /// <inheritdoc />
         public DateTimeOffset Timestamp => DateTimeUtils.FromTicks(_timestampTicks);
@@ -173,6 +175,8 @@ namespace Discord.Rest
         IReadOnlyCollection<IEmbed> IMessage.Embeds => Embeds;
         /// <inheritdoc />
         IReadOnlyCollection<ulong> IMessage.MentionedUserIds => MentionedUsers.Select(x => x.Id).ToImmutableArray();
+        /// <inheritdoc />
+        IReadOnlyCollection<ISticker> IMessage.Stickers => Stickers;
 
         /// <inheritdoc />
         public IReadOnlyDictionary<IEmote, ReactionMetadata> Reactions => _reactions.ToDictionary(x => x.Emote, x => new ReactionMetadata { ReactionCount = x.Count, IsMe = x.Me });

src/Discord.Net.Rest/Entities/Messages/RestUserMessage.cs

@@ -21,6 +21,7 @@ namespace Discord.Rest
         private ImmutableArray<ITag> _tags = ImmutableArray.Create<ITag>();
         private ImmutableArray<ulong> _roleMentionIds = ImmutableArray.Create<ulong>();
         private ImmutableArray<RestUser> _userMentions = ImmutableArray.Create<RestUser>();
+        private ImmutableArray<Sticker> _stickers = ImmutableArray.Create<Sticker>();
 
         /// <inheritdoc />
         public override bool IsTTS => _isTTS;
@@ -45,6 +46,8 @@ namespace Discord.Rest
         /// <inheritdoc />
         public override IReadOnlyCollection<ITag> Tags => _tags;
         /// <inheritdoc />
+        public override IReadOnlyCollection<Sticker> Stickers => _stickers;
+        /// <inheritdoc />
         public IUserMessage ReferencedMessage => _referencedMessage;
 
         internal RestUserMessage(BaseDiscordClient discord, ulong id, IMessageChannel channel, IUser author, MessageSource source)
@@ -132,6 +135,20 @@ namespace Discord.Rest
                 IUser refMsgAuthor = MessageHelper.GetAuthor(Discord, guild, refMsg.Author.Value, refMsg.WebhookId.ToNullable());
                 _referencedMessage = RestUserMessage.Create(Discord, Channel, refMsgAuthor, refMsg);
             }
+
+            if (model.Stickers.IsSpecified)
+            {
+                var value = model.Stickers.Value;
+                if (value.Length > 0)
+                {
+                    var stickers = ImmutableArray.CreateBuilder<Sticker>(value.Length);
+                    for (int i = 0; i < value.Length; i++)
+                        stickers.Add(Sticker.Create(value[i]));
+                    _stickers = stickers.ToImmutable();
+                }
+                else
+                    _stickers = ImmutableArray.Create<Sticker>();
+            }
         }
 
         /// <inheritdoc />

src/Discord.Net.Rest/Entities/Messages/Sticker.cs

@@ -0,0 +1,48 @@
+using System.Collections.Generic;
+using System.Diagnostics;
+using Model = Discord.API.Sticker;
+
+namespace Discord
+{
+    /// <inheritdoc cref="ISticker"/>
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    public class Sticker : ISticker
+    {
+        /// <inheritdoc />
+        public ulong Id { get; }
+        /// <inheritdoc />
+        public ulong PackId { get; }
+        /// <inheritdoc />
+        public string Name { get; }
+        /// <inheritdoc />
+        public string Description { get; }
+        /// <inheritdoc />
+        public IReadOnlyCollection<string> Tags { get; }
+        /// <inheritdoc />
+        public string Asset { get; }
+        /// <inheritdoc />
+        public string PreviewAsset { get; }
+        /// <inheritdoc />
+        public StickerFormatType FormatType { get; }
+
+        internal Sticker(ulong id, ulong packId, string name, string description, string[] tags, string asset, string previewAsset, StickerFormatType formatType)
+        {
+            Id = id;
+            PackId = packId;
+            Name = name;
+            Description = description;
+            Tags = tags.ToReadOnlyCollection();
+            Asset = asset;
+            PreviewAsset = previewAsset;
+            FormatType = formatType;
+        }
+        internal static Sticker Create(Model model)
+        {
+            return new Sticker(model.Id, model.PackId, model.Name, model.Desription,
+                model.Tags.IsSpecified ? model.Tags.Value.Split(',') : new string[0],
+                model.Asset, model.PreviewAsset, model.FormatType);
+        }
+
+        private string DebuggerDisplay => $"{Name} ({Id})";
+    }
+}