Add missing REST Webhook implemenation (#843)

* Add Webhook API models, REST implementation, and Socket bridges.

* Remove token overrides from REST.

Leaving that as a Webhook package only feature.

* Add Webhook API models, REST implementation, and Socket bridges.

* Remove token overrides from REST.

Leaving that as a Webhook package only feature.

* Webhook core implementation.

* Webhook REST implementation.

* Webhook client implementation.

* Add channel bucket id.

src/Discord.Net.Core/Entities/Channels/ITextChannel.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Threading.Tasks;
 
 namespace Discord
@@ -19,5 +20,12 @@ namespace Discord
 
         /// <summary> Modifies this text channel. </summary>
         Task ModifyAsync(Action<TextChannelProperties> func, RequestOptions options = null);
+
+        /// <summary> Creates a webhook in this text channel. </summary>
+        Task<IWebhook> CreateWebhookAsync(string name, Stream avatar = null, RequestOptions options = null);
+        /// <summary> Gets the webhook in this text channel with the provided id, or null if not found. </summary>
+        Task<IWebhook> GetWebhookAsync(ulong id, RequestOptions options = null);
+        /// <summary> Gets the webhooks for this text channel. </summary>
+        Task<IReadOnlyCollection<IWebhook>> GetWebhooksAsync(RequestOptions options = null);
     }
 }

src/Discord.Net.Core/Entities/Guilds/IGuild.cs

@@ -118,6 +118,11 @@ namespace Discord
         /// <summary> Removes all users from this guild if they have not logged on in a provided number of days or, if simulate is true, returns the number of users that would be removed. </summary>
         Task<int> PruneUsersAsync(int days = 30, bool simulate = false, RequestOptions options = null);
 
+        /// <summary> Gets the webhook in this guild with the provided id, or null if not found. </summary>
+        Task<IWebhook> GetWebhookAsync(ulong id, RequestOptions options = null);
+        /// <summary> Gets a collection of all webhooks for this guild. </summary>
+        Task<IReadOnlyCollection<IWebhook>> GetWebhooksAsync(RequestOptions options = null);
+        
         /// <summary> Gets a specific emote from this guild. </summary>
         Task<GuildEmote> GetEmoteAsync(ulong id, RequestOptions options = null);
         /// <summary> Creates a new emote in this guild. </summary>

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

@@ -1,6 +1,5 @@
 namespace Discord
 {
-    //TODO: Add webhook endpoints
     public interface IWebhookUser : IGuildUser
     {
         ulong WebhookId { get; }

src/Discord.Net.Core/Entities/Webhooks/IWebhook.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Discord
+{
+    public interface IWebhook : IDeletable, ISnowflakeEntity
+    {
+        /// <summary> Gets the token of this webhook. </summary>
+        string Token { get; }
+
+        /// <summary> Gets the default name of this webhook. </summary>
+        string Name { get; }
+        /// <summary> Gets the id of this webhook's default avatar. </summary>
+        string AvatarId { get; }
+        /// <summary> Gets the url to this webhook's default avatar. </summary>
+        string GetAvatarUrl(ImageFormat format = ImageFormat.Auto, ushort size = 128);
+
+        /// <summary> Gets the channel for this webhook. </summary>
+        ITextChannel Channel { get; }
+        /// <summary> Gets the id of the channel for this webhook. </summary>
+        ulong ChannelId { get; }
+
+        /// <summary> Gets the guild owning this webhook. </summary>
+        IGuild Guild { get; }
+        /// <summary> Gets the id of the guild owning this webhook. </summary>
+        ulong? GuildId { get; }
+
+        /// <summary> Gets the user that created this webhook. </summary>
+        IUser Creator { get; }
+
+        /// <summary> Modifies this webhook. </summary>
+        Task ModifyAsync(Action<WebhookProperties> func, RequestOptions options = null);
+    }
+}

src/Discord.Net.Core/Entities/Webhooks/WebhookProperties.cs

@@ -0,0 +1,41 @@
+namespace Discord
+{
+    /// <summary>
+    /// Modify an <see cref="IWebhook"/> with the specified parameters.
+    /// </summary>
+    /// <example>
+    /// <code language="c#">
+    /// await webhook.ModifyAsync(x =>
+    /// {
+    ///     x.Name = "Bob";
+    ///     x.Avatar = new Image("avatar.jpg");
+    /// });
+    /// </code>
+    /// </example>
+    /// <seealso cref="IWebhook"/>
+    public class WebhookProperties
+    {
+        /// <summary>
+        /// The default name of the webhook.
+        /// </summary>
+        public Optional<string> Name { get; set; }
+        /// <summary>
+        /// The default avatar of the webhook.
+        /// </summary>
+        public Optional<Image?> Image { get; set; }
+        /// <summary>
+        /// The channel for this webhook.
+        /// </summary>
+        /// <remarks>
+        /// This field is not used when authenticated with <see cref="TokenType.Webhook"/>.
+        /// </remarks>
+        public Optional<ITextChannel> Channel { get; set; }
+        /// <summary>
+        /// The channel id for this webhook.
+        /// </summary>
+        /// <remarks>
+        /// This field is not used when authenticated with <see cref="TokenType.Webhook"/>.
+        /// </remarks>
+        public Optional<ulong> ChannelId { get; set; }
+    }
+}

src/Discord.Net.Core/IDiscordClient.cs

@@ -34,5 +34,7 @@ namespace Discord
 
         Task<IReadOnlyCollection<IVoiceRegion>> GetVoiceRegionsAsync(RequestOptions options = null);
         Task<IVoiceRegion> GetVoiceRegionAsync(string id, RequestOptions options = null);
+
+        Task<IWebhook> GetWebhookAsync(ulong id, RequestOptions options = null);
     }
 }

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

@@ -0,0 +1,25 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class Webhook
+    {
+        [JsonProperty("id")]
+        public ulong Id { get; set; }
+        [JsonProperty("channel_id")]
+        public ulong ChannelId { get; set; }
+        [JsonProperty("token")]
+        public string Token { get; set; }
+
+        [JsonProperty("name")]
+        public Optional<string> Name { get; set; }
+        [JsonProperty("avatar")]
+        public Optional<string> Avatar { get; set; }
+        [JsonProperty("guild_id")]
+        public Optional<ulong> GuildId { get; set; }
+
+        [JsonProperty("user")]
+        public Optional<User> Creator { get; set; }
+    }
+}

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

@@ -0,0 +1,14 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API.Rest
+{
+    [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+    internal class CreateWebhookParams
+    {
+        [JsonProperty("name")]
+        public string Name { get; set; }
+        [JsonProperty("avatar")]
+        public Optional<Image?> Avatar { get; set; }
+    }
+}

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

@@ -0,0 +1,16 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API.Rest
+{
+    [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+    internal class ModifyWebhookParams
+    {
+        [JsonProperty("name")]
+        public Optional<string> Name { get; set; }
+        [JsonProperty("avatar")]
+        public Optional<Image?> Avatar { get; set; }
+        [JsonProperty("channel_id")]
+        public Optional<ulong> ChannelId { get; set; }
+    }
+}

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

@@ -1,7 +1,7 @@
 #pragma warning disable CS1591
-using Discord.Net.Rest;
 using System.Collections.Generic;
 using System.IO;
+using Discord.Net.Rest;
 
 namespace Discord.API.Rest
 {
@@ -15,6 +15,7 @@ namespace Discord.API.Rest
         public Optional<bool> IsTTS { get; set; }
         public Optional<string> Username { get; set; }
         public Optional<string> AvatarUrl { get; set; }
+        public Optional<Embed[]> Embeds { get; set; }
 
         public UploadWebhookFileParams(Stream file)
         {
@@ -25,6 +26,7 @@ namespace Discord.API.Rest
         {
             var d = new Dictionary<string, object>();
             d["file"] = new MultipartFile(File, Filename.GetValueOrDefault("unknown.dat"));
+
             if (Content.IsSpecified)
                 d["content"] = Content.Value;
             if (IsTTS.IsSpecified)
@@ -35,6 +37,8 @@ namespace Discord.API.Rest
                 d["username"] = Username.Value;
             if (AvatarUrl.IsSpecified)
                 d["avatar_url"] = AvatarUrl.Value;
+            if (Embeds.IsSpecified)
+                d["embeds"] = Embeds.Value;
             return d;
         }
     }

src/Discord.Net.Rest/BaseDiscordClient.cs

@@ -164,6 +164,9 @@ namespace Discord.Rest
         Task<IVoiceRegion> IDiscordClient.GetVoiceRegionAsync(string id, RequestOptions options)
             => Task.FromResult<IVoiceRegion>(null);
 
+        Task<IWebhook> IDiscordClient.GetWebhookAsync(ulong id, RequestOptions options)
+            => Task.FromResult<IWebhook>(null);
+
         Task IDiscordClient.StartAsync()
             => Task.Delay(0);
         Task IDiscordClient.StopAsync()

src/Discord.Net.Rest/ClientHelper.cs

@@ -144,6 +144,14 @@ namespace Discord.Rest
             return null;
         }
 
+        public static async Task<RestWebhook> GetWebhookAsync(BaseDiscordClient client, ulong id, RequestOptions options)
+        {
+            var model = await client.ApiClient.GetWebhookAsync(id);
+            if (model != null)
+                return RestWebhook.Create(client, (IGuild)null, model);
+            return null;
+        }
+
         public static async Task<IReadOnlyCollection<RestVoiceRegion>> GetVoiceRegionsAsync(BaseDiscordClient client, RequestOptions options)
         {
             var models = await client.ApiClient.GetVoiceRegionsAsync(options).ConfigureAwait(false);

src/Discord.Net.Rest/DiscordRestApiClient.cs

@@ -473,7 +473,7 @@ namespace Discord.API
             var ids = new BucketIds(channelId: channelId);
             return await SendJsonAsync<Message>("POST", () => $"channels/{channelId}/messages", args, ids, clientBucket: ClientBucketType.SendEdit, options: options).ConfigureAwait(false);
         }
-        public async Task CreateWebhookMessageAsync(ulong webhookId, CreateWebhookMessageParams args, RequestOptions options = null)
+        public async Task<Message> CreateWebhookMessageAsync(ulong webhookId, CreateWebhookMessageParams args, RequestOptions options = null)
         {
             if (AuthTokenType != TokenType.Webhook)
                 throw new InvalidOperationException($"This operation may only be called with a {nameof(TokenType.Webhook)} token.");
@@ -486,8 +486,8 @@ namespace Discord.API
             if (args.Content.Length > DiscordConfig.MaxMessageSize)
                 throw new ArgumentException($"Message content is too long, length must be less or equal to {DiscordConfig.MaxMessageSize}.", nameof(args.Content));
             options = RequestOptions.CreateOrClone(options);
-
-            await SendJsonAsync("POST", () => $"webhooks/{webhookId}/{AuthToken}", args, new BucketIds(), clientBucket: ClientBucketType.SendEdit, options: options).ConfigureAwait(false);
+            
+            return await SendJsonAsync<Message>("POST", () => $"webhooks/{webhookId}/{AuthToken}?wait=true", args, new BucketIds(), clientBucket: ClientBucketType.SendEdit, options: options).ConfigureAwait(false);
         }
         public async Task<Message> UploadFileAsync(ulong channelId, UploadFileParams args, RequestOptions options = null)
         {
@@ -503,7 +503,7 @@ namespace Discord.API
             var ids = new BucketIds(channelId: channelId);
             return await SendMultipartAsync<Message>("POST", () => $"channels/{channelId}/messages", args.ToDictionary(), ids, clientBucket: ClientBucketType.SendEdit, options: options).ConfigureAwait(false);
         }
-        public async Task UploadWebhookFileAsync(ulong webhookId, UploadWebhookFileParams args, RequestOptions options = null)
+        public async Task<Message> UploadWebhookFileAsync(ulong webhookId, UploadWebhookFileParams args, RequestOptions options = null)
         {
             if (AuthTokenType != TokenType.Webhook)
                 throw new InvalidOperationException($"This operation may only be called with a {nameof(TokenType.Webhook)} token.");
@@ -522,7 +522,7 @@ namespace Discord.API
                     throw new ArgumentOutOfRangeException($"Message content is too long, length must be less or equal to {DiscordConfig.MaxMessageSize}.", nameof(args.Content));
             }
 
-            await SendMultipartAsync("POST", () => $"webhooks/{webhookId}/{AuthToken}", args.ToDictionary(), new BucketIds(), clientBucket: ClientBucketType.SendEdit, options: options).ConfigureAwait(false);
+            return await SendMultipartAsync<Message>("POST", () => $"webhooks/{webhookId}/{AuthToken}?wait=true", args.ToDictionary(), new BucketIds(), clientBucket: ClientBucketType.SendEdit, options: options).ConfigureAwait(false);
         }
         public async Task DeleteMessageAsync(ulong channelId, ulong messageId, RequestOptions options = null)
         {
@@ -1198,6 +1198,70 @@ namespace Discord.API
             return await SendAsync<IReadOnlyCollection<VoiceRegion>>("GET", () => $"guilds/{guildId}/regions", ids, options: options).ConfigureAwait(false);
         }
 
+        //Webhooks
+        public async Task<Webhook> CreateWebhookAsync(ulong channelId, CreateWebhookParams args, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(channelId, 0, nameof(channelId));
+            Preconditions.NotNull(args, nameof(args));
+            Preconditions.NotNull(args.Name, nameof(args.Name));
+            options = RequestOptions.CreateOrClone(options);
+            var ids = new BucketIds(channelId: channelId);
+
+            return await SendJsonAsync<Webhook>("POST", () => $"channels/{channelId}/webhooks", args, ids, options: options);
+        }
+        public async Task<Webhook> GetWebhookAsync(ulong webhookId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(webhookId, 0, nameof(webhookId));
+            options = RequestOptions.CreateOrClone(options);
+
+            try
+            {
+                if (AuthTokenType == TokenType.Webhook)
+                    return await SendAsync<Webhook>("GET", () => $"webhooks/{webhookId}/{AuthToken}", new BucketIds(), options: options).ConfigureAwait(false);
+                else
+                    return await SendAsync<Webhook>("GET", () => $"webhooks/{webhookId}", new BucketIds(), options: options).ConfigureAwait(false);
+            }
+            catch (HttpException ex) when (ex.HttpCode == HttpStatusCode.NotFound) { return null; }
+        }
+        public async Task<Webhook> ModifyWebhookAsync(ulong webhookId, ModifyWebhookParams args, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(webhookId, 0, nameof(webhookId));
+            Preconditions.NotNull(args, nameof(args));
+            Preconditions.NotNullOrEmpty(args.Name, nameof(args.Name));
+            options = RequestOptions.CreateOrClone(options);
+            
+            if (AuthTokenType == TokenType.Webhook)
+                return await SendJsonAsync<Webhook>("PATCH", () => $"webhooks/{webhookId}/{AuthToken}", args, new BucketIds(), options: options).ConfigureAwait(false);
+            else
+                return await SendJsonAsync<Webhook>("PATCH", () => $"webhooks/{webhookId}", args, new BucketIds(), options: options).ConfigureAwait(false);
+        }
+        public async Task DeleteWebhookAsync(ulong webhookId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(webhookId, 0, nameof(webhookId));
+            options = RequestOptions.CreateOrClone(options);
+
+            if (AuthTokenType == TokenType.Webhook)
+                await SendAsync("DELETE", () => $"webhooks/{webhookId}/{AuthToken}", new BucketIds(), options: options).ConfigureAwait(false);
+            else
+                await SendAsync("DELETE", () => $"webhooks/{webhookId}", new BucketIds(), options: options).ConfigureAwait(false);
+        }
+        public async Task<IReadOnlyCollection<Webhook>> GetGuildWebhooksAsync(ulong guildId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(guildId, 0, nameof(guildId));
+            options = RequestOptions.CreateOrClone(options);
+
+            var ids = new BucketIds(guildId: guildId);
+            return await SendAsync<IReadOnlyCollection<Webhook>>("GET", () => $"guilds/{guildId}/webhooks", ids, options: options).ConfigureAwait(false);
+        }
+        public async Task<IReadOnlyCollection<Webhook>> GetChannelWebhooksAsync(ulong channelId, RequestOptions options = null)
+        {
+            Preconditions.NotEqual(channelId, 0, nameof(channelId));
+            options = RequestOptions.CreateOrClone(options);
+
+            var ids = new BucketIds(channelId: channelId);
+            return await SendAsync<IReadOnlyCollection<Webhook>>("GET", () => $"channels/{channelId}/webhooks", ids, options: options).ConfigureAwait(false);
+        }
+
         //Helpers
         protected void CheckState()
         {

src/Discord.Net.Rest/DiscordRestClient.cs

@@ -91,6 +91,9 @@ namespace Discord.Rest
         /// <inheritdoc />
         public Task<RestVoiceRegion> GetVoiceRegionAsync(string id, RequestOptions options = null)
             => ClientHelper.GetVoiceRegionAsync(this, id, options);
+        /// <inheritdoc />
+        public Task<RestWebhook> GetWebhookAsync(ulong id, RequestOptions options = null)
+            => ClientHelper.GetWebhookAsync(this, id, options);
 
         //IDiscordClient
         async Task<IApplication> IDiscordClient.GetApplicationInfoAsync(RequestOptions options)
@@ -160,5 +163,8 @@ namespace Discord.Rest
             => await GetVoiceRegionsAsync(options).ConfigureAwait(false);
         async Task<IVoiceRegion> IDiscordClient.GetVoiceRegionAsync(string id, RequestOptions options)
             => await GetVoiceRegionAsync(id, options).ConfigureAwait(false);
+
+        async Task<IWebhook> IDiscordClient.GetWebhookAsync(ulong id, RequestOptions options)
+            => await GetWebhookAsync(id, options);
     }
 }

src/Discord.Net.Rest/Entities/Channels/ChannelHelper.cs

@@ -7,6 +7,7 @@ using System.Linq;
 using System.Threading.Tasks;
 using Model = Discord.API.Channel;
 using UserModel = Discord.API.User;
+using WebhookModel = Discord.API.Webhook;
 
 namespace Discord.Rest
 {
@@ -280,6 +281,30 @@ namespace Discord.Rest
             RequestOptions options)
             => new TypingNotifier(client, channel, options);
 
+        //Webhooks
+        public static async Task<RestWebhook> CreateWebhookAsync(ITextChannel channel, BaseDiscordClient client, string name, Stream avatar, RequestOptions options)
+        {
+            var args = new CreateWebhookParams { Name = name };
+            if (avatar != null)
+                args.Avatar = new API.Image(avatar);
+
+            var model = await client.ApiClient.CreateWebhookAsync(channel.Id, args, options).ConfigureAwait(false);
+            return RestWebhook.Create(client, channel, model);
+        }
+        public static async Task<RestWebhook> GetWebhookAsync(ITextChannel channel, BaseDiscordClient client, ulong id, RequestOptions options)
+        {
+            var model = await client.ApiClient.GetWebhookAsync(id, options: options).ConfigureAwait(false);
+            if (model == null)
+                return null;
+            return RestWebhook.Create(client, channel, model);
+        }
+        public static async Task<IReadOnlyCollection<RestWebhook>> GetWebhooksAsync(ITextChannel channel, BaseDiscordClient client, RequestOptions options)
+        {
+            var models = await client.ApiClient.GetChannelWebhooksAsync(channel.Id, options).ConfigureAwait(false);
+            return models.Select(x => RestWebhook.Create(client, channel, x))
+                .ToImmutableArray();
+        }
+
         //Helpers
         private static IUser GetAuthor(BaseDiscordClient client, IGuild guild, UserModel model, ulong? webhookId)
         {

src/Discord.Net.Rest/Entities/Channels/RestTextChannel.cs

@@ -77,8 +77,23 @@ namespace Discord.Rest
         public IDisposable EnterTypingState(RequestOptions options = null)
             => ChannelHelper.EnterTypingState(this, Discord, options);
 
+        public Task<RestWebhook> CreateWebhookAsync(string name, Stream avatar = null, RequestOptions options = null)
+            => ChannelHelper.CreateWebhookAsync(this, Discord, name, avatar, options);
+        public Task<RestWebhook> GetWebhookAsync(ulong id, RequestOptions options = null)
+            => ChannelHelper.GetWebhookAsync(this, Discord, id, options);
+        public Task<IReadOnlyCollection<RestWebhook>> GetWebhooksAsync(RequestOptions options = null)
+            => ChannelHelper.GetWebhooksAsync(this, Discord, options);
+
         private string DebuggerDisplay => $"{Name} ({Id}, Text)";
 
+        //ITextChannel
+        async Task<IWebhook> ITextChannel.CreateWebhookAsync(string name, Stream avatar, RequestOptions options)
+            => await CreateWebhookAsync(name, avatar, options);
+        async Task<IWebhook> ITextChannel.GetWebhookAsync(ulong id, RequestOptions options)
+            => await GetWebhookAsync(id, options);
+        async Task<IReadOnlyCollection<IWebhook>> ITextChannel.GetWebhooksAsync(RequestOptions options)
+            => await GetWebhooksAsync(options);
+
         //IMessageChannel
         async Task<IMessage> IMessageChannel.GetMessageAsync(ulong id, CacheMode mode, RequestOptions options)
         {

src/Discord.Net.Rest/Entities/Guilds/GuildHelper.cs

@@ -254,6 +254,20 @@ namespace Discord.Rest
             return model.Pruned;
         }
 
+        //Webhooks
+        public static async Task<RestWebhook> GetWebhookAsync(IGuild guild, BaseDiscordClient client, ulong id, RequestOptions options)
+        {
+            var model = await client.ApiClient.GetWebhookAsync(id, options: options).ConfigureAwait(false);
+            if (model == null)
+                return null;
+            return RestWebhook.Create(client, guild, model);
+        }
+        public static async Task<IReadOnlyCollection<RestWebhook>> GetWebhooksAsync(IGuild guild, BaseDiscordClient client, RequestOptions options)
+        {
+            var models = await client.ApiClient.GetGuildWebhooksAsync(guild.Id, options).ConfigureAwait(false);
+            return models.Select(x => RestWebhook.Create(client, guild, x)).ToImmutableArray();
+        }
+
         //Emotes
         public static async Task<GuildEmote> GetEmoteAsync(IGuild guild, BaseDiscordClient client, ulong id, RequestOptions options)
         {

src/Discord.Net.Rest/Entities/Guilds/RestGuild.cs

@@ -257,6 +257,12 @@ namespace Discord.Rest
         public Task<int> PruneUsersAsync(int days = 30, bool simulate = false, RequestOptions options = null)
             => GuildHelper.PruneUsersAsync(this, Discord, days, simulate, options);
 
+        //Webhooks
+        public Task<RestWebhook> GetWebhookAsync(ulong id, RequestOptions options = null)
+            => GuildHelper.GetWebhookAsync(this, Discord, id, options);
+        public Task<IReadOnlyCollection<RestWebhook>> GetWebhooksAsync(RequestOptions options = null)
+            => GuildHelper.GetWebhooksAsync(this, Discord, options);
+
         public override string ToString() => Name;
         private string DebuggerDisplay => $"{Name} ({Id})";
 
@@ -396,5 +402,10 @@ namespace Discord.Rest
                 return ImmutableArray.Create<IGuildUser>();
         }
         Task IGuild.DownloadUsersAsync() { throw new NotSupportedException(); }
+
+        async Task<IWebhook> IGuild.GetWebhookAsync(ulong id, RequestOptions options)
+            => await GetWebhookAsync(id, options);
+        async Task<IReadOnlyCollection<IWebhook>> IGuild.GetWebhooksAsync(RequestOptions options)
+            => await GetWebhooksAsync(options);
     }
 }

src/Discord.Net.Rest/Entities/Webhooks/RestWebhook.cs

@@ -0,0 +1,91 @@
+using System;
+using System.Diagnostics;
+using System.Threading.Tasks;
+using Model = Discord.API.Webhook;
+
+namespace Discord.Rest
+{
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    public class RestWebhook : RestEntity<ulong>, IWebhook, IUpdateable
+    {
+        internal IGuild Guild { get; private set; }
+        internal ITextChannel Channel { get; private set; }
+
+        public ulong ChannelId { get; }
+        public string Token { get; }
+
+        public string Name { get; private set; }
+        public string AvatarId { get; private set; }
+        public ulong? GuildId { get; private set; }
+        public IUser Creator { get; private set; }
+
+        public DateTimeOffset CreatedAt => SnowflakeUtils.FromSnowflake(Id);
+
+        internal RestWebhook(BaseDiscordClient discord, IGuild guild, ulong id, string token, ulong channelId)
+            : base(discord, id)
+        {
+            Guild = guild;
+            Token = token;
+            ChannelId = channelId;
+        }
+        internal RestWebhook(BaseDiscordClient discord, ITextChannel channel, ulong id, string token, ulong channelId)
+            : this(discord, channel.Guild, id, token, channelId)
+        {
+            Channel = channel;
+        }
+
+        internal static RestWebhook Create(BaseDiscordClient discord, IGuild guild, Model model)
+        {
+            var entity = new RestWebhook(discord, guild, model.Id, model.Token, model.ChannelId);
+            entity.Update(model);
+            return entity;
+        }
+        internal static RestWebhook Create(BaseDiscordClient discord, ITextChannel channel, Model model)
+        {
+            var entity = new RestWebhook(discord, channel, model.Id, model.Token, model.ChannelId);
+            entity.Update(model);
+            return entity;
+        }
+
+        internal void Update(Model model)
+        {
+            if (model.Avatar.IsSpecified)
+                AvatarId = model.Avatar.Value;
+            if (model.Creator.IsSpecified)
+                Creator = RestUser.Create(Discord, model.Creator.Value);
+            if (model.GuildId.IsSpecified)
+                GuildId = model.GuildId.Value;
+            if (model.Name.IsSpecified)
+                Name = model.Name.Value;
+        }
+
+        public async Task UpdateAsync(RequestOptions options = null)
+        {
+            var model = await Discord.ApiClient.GetWebhookAsync(Id, options).ConfigureAwait(false);
+            Update(model);
+        }
+
+        public string GetAvatarUrl(ImageFormat format = ImageFormat.Auto, ushort size = 128)
+           => CDN.GetUserAvatarUrl(Id, AvatarId, size, format);
+
+        public async Task ModifyAsync(Action<WebhookProperties> func, RequestOptions options = null)
+        {
+            var model = await WebhookHelper.ModifyAsync(this, Discord, func, options).ConfigureAwait(false);
+            Update(model);
+        }
+
+        public Task DeleteAsync(RequestOptions options = null)
+            => WebhookHelper.DeleteAsync(this, Discord, options);
+
+        public override string ToString() => $"Webhook: {Name}:{Id}";
+        private string DebuggerDisplay => $"Webhook: {Name} ({Id})";
+
+        //IWebhook
+        IGuild IWebhook.Guild 
+            => Guild ?? throw new InvalidOperationException("Unable to return this entity's parent unless it was fetched through that object.");
+        ITextChannel IWebhook.Channel 
+            => Channel ?? throw new InvalidOperationException("Unable to return this entity's parent unless it was fetched through that object.");
+        Task IWebhook.ModifyAsync(Action<WebhookProperties> func, RequestOptions options)
+            => ModifyAsync(func, options);
+    }
+}

src/Discord.Net.Rest/Entities/Webhooks/WebhookHelper.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Threading.Tasks;
+using Discord.API.Rest;
+using ImageModel = Discord.API.Image;
+using Model = Discord.API.Webhook;
+
+namespace Discord.Rest
+{
+    internal static class WebhookHelper
+    {
+        public static async Task<Model> ModifyAsync(IWebhook webhook, BaseDiscordClient client,
+            Action<WebhookProperties> func, RequestOptions options)
+        {
+            var args = new WebhookProperties();
+            func(args);
+            var apiArgs = new ModifyWebhookParams
+            {
+                Avatar = args.Image.IsSpecified ? args.Image.Value?.ToModel() : Optional.Create<ImageModel?>(),
+                Name = args.Name
+            };
+
+            if (!apiArgs.Avatar.IsSpecified && webhook.AvatarId != null)
+                apiArgs.Avatar = new ImageModel(webhook.AvatarId);
+
+            if (args.Channel.IsSpecified)
+                apiArgs.ChannelId = args.Channel.Value.Id;
+            else if (args.ChannelId.IsSpecified)
+                apiArgs.ChannelId = args.ChannelId.Value;
+
+            return await client.ApiClient.ModifyWebhookAsync(webhook.Id, apiArgs, options).ConfigureAwait(false);
+        }
+        public static async Task DeleteAsync(IWebhook webhook, BaseDiscordClient client, RequestOptions options)
+        {
+            await client.ApiClient.DeleteWebhookAsync(webhook.Id, options).ConfigureAwait(false);
+        }
+
+    }
+}

src/Discord.Net.Rpc/Entities/Channels/RpcTextChannel.cs

@@ -68,11 +68,25 @@ namespace Discord.Rpc
             => ChannelHelper.TriggerTypingAsync(this, Discord, options);
         public IDisposable EnterTypingState(RequestOptions options = null)
             => ChannelHelper.EnterTypingState(this, Discord, options);
-        
+
+        //Webhooks
+        public Task<RestWebhook> CreateWebhookAsync(string name, Stream avatar = null, RequestOptions options = null)
+            => ChannelHelper.CreateWebhookAsync(this, Discord, name, avatar, options);
+        public Task<RestWebhook> GetWebhookAsync(ulong id, RequestOptions options = null)
+            => ChannelHelper.GetWebhookAsync(this, Discord, id, options);
+        public Task<IReadOnlyCollection<RestWebhook>> GetWebhooksAsync(RequestOptions options = null)
+            => ChannelHelper.GetWebhooksAsync(this, Discord, options);
+
         private string DebuggerDisplay => $"{Name} ({Id}, Text)";
         
         //ITextChannel
         string ITextChannel.Topic {  get { throw new NotSupportedException(); } }
+        async Task<IWebhook> ITextChannel.CreateWebhookAsync(string name, Stream avatar, RequestOptions options)
+            => await CreateWebhookAsync(name, avatar, options);
+        async Task<IWebhook> ITextChannel.GetWebhookAsync(ulong id, RequestOptions options)
+            => await GetWebhookAsync(id, options);
+        async Task<IReadOnlyCollection<IWebhook>> ITextChannel.GetWebhooksAsync(RequestOptions options)
+            => await GetWebhooksAsync(options);
 
         //IMessageChannel
         async Task<IMessage> IMessageChannel.GetMessageAsync(ulong id, CacheMode mode, RequestOptions options)

src/Discord.Net.WebSocket/API/Gateway/WebhookUpdateEvent.cs

@@ -0,0 +1,13 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API.Gateway
+{
+    internal class WebhookUpdateEvent
+    {
+        [JsonProperty("guild_id")]
+        public ulong GuildId { get; set; }
+        [JsonProperty("channel_id")]
+        public ulong ChannelId { get; set; }
+    }
+}

src/Discord.Net.WebSocket/Entities/Channels/SocketTextChannel.cs

@@ -112,10 +112,26 @@ namespace Discord.WebSocket
             }
             return null;
         }
-        
+
+        //Webhooks
+        public Task<RestWebhook> CreateWebhookAsync(string name, Stream avatar = null, RequestOptions options = null)
+            => ChannelHelper.CreateWebhookAsync(this, Discord, name, avatar, options);
+        public Task<RestWebhook> GetWebhookAsync(ulong id, RequestOptions options = null)
+            => ChannelHelper.GetWebhookAsync(this, Discord, id, options);
+        public Task<IReadOnlyCollection<RestWebhook>> GetWebhooksAsync(RequestOptions options = null)
+            => ChannelHelper.GetWebhooksAsync(this, Discord, options);
+
         private string DebuggerDisplay => $"{Name} ({Id}, Text)";
         internal new SocketTextChannel Clone() => MemberwiseClone() as SocketTextChannel;
 
+        //ITextChannel
+        async Task<IWebhook> ITextChannel.CreateWebhookAsync(string name, Stream avatar, RequestOptions options)
+            => await CreateWebhookAsync(name, avatar, options);
+        async Task<IWebhook> ITextChannel.GetWebhookAsync(ulong id, RequestOptions options)
+            => await GetWebhookAsync(id, options);
+        async Task<IReadOnlyCollection<IWebhook>> ITextChannel.GetWebhooksAsync(RequestOptions options)
+            => await GetWebhooksAsync(options);
+
         //IGuildChannel
         Task<IGuildUser> IGuildChannel.GetUserAsync(ulong id, CacheMode mode, RequestOptions options)
             => Task.FromResult<IGuildUser>(GetUser(id));

src/Discord.Net.WebSocket/Entities/Guilds/SocketGuild.cs

@@ -433,6 +433,12 @@ namespace Discord.WebSocket
             _downloaderPromise.TrySetResultAsync(true);
         }
 
+        //Webhooks
+        public Task<RestWebhook> GetWebhookAsync(ulong id, RequestOptions options = null)
+            => GuildHelper.GetWebhookAsync(this, Discord, id, options);
+        public Task<IReadOnlyCollection<RestWebhook>> GetWebhooksAsync(RequestOptions options = null)
+            => GuildHelper.GetWebhooksAsync(this, Discord, options);
+
         //Emotes
         public Task<GuildEmote> GetEmoteAsync(ulong id, RequestOptions options = null)
             => GuildHelper.GetEmoteAsync(this, Discord, id, options);
@@ -682,5 +688,10 @@ namespace Discord.WebSocket
         Task<IGuildUser> IGuild.GetOwnerAsync(CacheMode mode, RequestOptions options)
             => Task.FromResult<IGuildUser>(Owner);
         Task IGuild.DownloadUsersAsync() { throw new NotSupportedException(); }
+
+        async Task<IWebhook> IGuild.GetWebhookAsync(ulong id, RequestOptions options)
+            => await GetWebhookAsync(id, options);
+        async Task<IReadOnlyCollection<IWebhook>> IGuild.GetWebhooksAsync(RequestOptions options)
+            => await GetWebhooksAsync(options);
     }
 }

src/Discord.Net.Webhook/DiscordWebhookClient.cs

@@ -1,32 +1,49 @@
-using Discord.API.Rest;
-using Discord.Rest;
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Threading.Tasks;
-using System.Linq;
 using Discord.Logging;
+using Discord.Rest;
 
 namespace Discord.Webhook
 {
-    public partial class DiscordWebhookClient
+    public class DiscordWebhookClient : IDisposable
     {
         public event Func<LogMessage, Task> Log { add { _logEvent.Add(value); } remove { _logEvent.Remove(value); } }
         internal readonly AsyncEvent<Func<LogMessage, Task>> _logEvent = new AsyncEvent<Func<LogMessage, Task>>();
 
         private readonly ulong _webhookId;
+        internal IWebhook Webhook;
         internal readonly Logger _restLogger;
         
         internal API.DiscordRestApiClient ApiClient { get; }
         internal LogManager LogManager { get; }
 
         /// <summary> Creates a new Webhook discord client. </summary>
+        public DiscordWebhookClient(IWebhook webhook)
+            : this(webhook.Id, webhook.Token, new DiscordRestConfig()) {  }
+        /// <summary> Creates a new Webhook discord client. </summary>
         public DiscordWebhookClient(ulong webhookId, string webhookToken)
             : this(webhookId, webhookToken, new DiscordRestConfig()) { }
+
         /// <summary> Creates a new Webhook discord client. </summary>
         public DiscordWebhookClient(ulong webhookId, string webhookToken, DiscordRestConfig config)
+            : this(config)
         {
             _webhookId = webhookId;
+            ApiClient.LoginAsync(TokenType.Webhook, webhookToken).GetAwaiter().GetResult();
+            Webhook = WebhookClientHelper.GetWebhookAsync(this, webhookId).GetAwaiter().GetResult();
+        }
+        /// <summary> Creates a new Webhook discord client. </summary>
+        public DiscordWebhookClient(IWebhook webhook, DiscordRestConfig config)
+            : this(config)
+        {
+            Webhook = webhook;
+            _webhookId = Webhook.Id;
+        }
 
+        private DiscordWebhookClient(DiscordRestConfig config)
+        {
             ApiClient = CreateApiClient(config);
             LogManager = new LogManager(config.LogLevel);
             LogManager.Message += async msg => await _logEvent.InvokeAsync(msg).ConfigureAwait(false);
@@ -41,42 +58,40 @@ namespace Discord.Webhook
                     await _restLogger.WarningAsync($"Rate limit triggered: {id ?? "null"}").ConfigureAwait(false);
             };
             ApiClient.SentRequest += async (method, endpoint, millis) => await _restLogger.VerboseAsync($"{method} {endpoint}: {millis} ms").ConfigureAwait(false);
-            ApiClient.LoginAsync(TokenType.Webhook, webhookToken).GetAwaiter().GetResult();
         }
         private static API.DiscordRestApiClient CreateApiClient(DiscordRestConfig config)
             => new API.DiscordRestApiClient(config.RestClientProvider, DiscordRestConfig.UserAgent);
-
-        public async Task SendMessageAsync(string text, bool isTTS = false, Embed[] embeds = null, 
+        
+        /// <summary> Sends a message using to the channel for this webhook. Returns the ID of the created message. </summary>
+        public Task<ulong> SendMessageAsync(string text, bool isTTS = false, IEnumerable<Embed> embeds = null,
             string username = null, string avatarUrl = null, RequestOptions options = null)
-        {
-            var args = new CreateWebhookMessageParams(text) { IsTTS = isTTS };
-            if (embeds != null)
-                args.Embeds = embeds.Select(x => x.ToModel()).ToArray();
-            if (username != null)
-                args.Username = username;
-            if (avatarUrl != null)
-                args.AvatarUrl = avatarUrl;
-            await ApiClient.CreateWebhookMessageAsync(_webhookId, args, options).ConfigureAwait(false);
-        }
+            => WebhookClientHelper.SendMessageAsync(this, text, isTTS, embeds, username, avatarUrl, options);
 
 #if FILESYSTEM
-        public async Task SendFileAsync(string filePath, string text, bool isTTS = false, 
-            string username = null, string avatarUrl = null, RequestOptions options = null)
+        /// <summary> Send a message to the channel for this webhook with an attachment. Returns the ID of the created message. </summary>
+        public Task<ulong> SendFileAsync(string filePath, string text, bool isTTS = false,
+            IEnumerable<Embed> embeds = null, string username = null, string avatarUrl = null, RequestOptions options = null)
+            => WebhookClientHelper.SendFileAsync(this, filePath, text, isTTS, embeds, username, avatarUrl, options);
+#endif
+        /// <summary> Send a message to the channel for this webhook with an attachment. Returns the ID of the created message. </summary>
+        public Task<ulong> SendFileAsync(Stream stream, string filename, string text, bool isTTS = false,
+            IEnumerable<Embed> embeds = null, string username = null, string avatarUrl = null, RequestOptions options = null)
+            => WebhookClientHelper.SendFileAsync(this, stream, filename, text, isTTS, embeds, username, avatarUrl, options);
+
+        /// <summary> Modifies the properties of this webhook. </summary>
+        public Task ModifyWebhookAsync(Action<WebhookProperties> func, RequestOptions options = null)
+            => Webhook.ModifyAsync(func, options);
+
+        /// <summary> Deletes this webhook from Discord and disposes the client. </summary>
+        public async Task DeleteWebhookAsync(RequestOptions options = null)
         {
-            string filename = Path.GetFileName(filePath);
-            using (var file = File.OpenRead(filePath))
-                await SendFileAsync(file, filename, text, isTTS, username, avatarUrl, options).ConfigureAwait(false);
+            await Webhook.DeleteAsync(options).ConfigureAwait(false);
+            Dispose();
         }
-#endif
-        public async Task SendFileAsync(Stream stream, string filename, string text, bool isTTS = false, 
-            string username = null, string avatarUrl = null, RequestOptions options = null)
+
+        public void Dispose()
         {
-            var args = new UploadWebhookFileParams(stream) { Filename = filename, Content = text, IsTTS = isTTS };
-            if (username != null)
-                args.Username = username;
-            if (avatarUrl != null)
-                args.AvatarUrl = username;
-            await ApiClient.UploadWebhookFileAsync(_webhookId, args, options).ConfigureAwait(false);
+            ApiClient?.Dispose();
         }
     }
 }

src/Discord.Net.Webhook/Entities/Webhooks/RestInternalWebhook.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Diagnostics;
+using System.Threading.Tasks;
+using Model = Discord.API.Webhook;
+
+namespace Discord.Webhook
+{
+    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
+    internal class RestInternalWebhook : IWebhook
+    {
+        private DiscordWebhookClient _client;
+
+        public ulong Id { get; }
+        public ulong ChannelId { get; }
+        public string Token { get; }
+
+        public string Name { get; private set; }
+        public string AvatarId { get; private set; }
+        public ulong? GuildId { get; private set; }
+
+        public DateTimeOffset CreatedAt => SnowflakeUtils.FromSnowflake(Id);
+
+        internal RestInternalWebhook(DiscordWebhookClient apiClient, Model model)
+        {
+            _client = apiClient;
+            Id = model.Id;
+            ChannelId = model.Id;
+            Token = model.Token;
+        }
+        internal static RestInternalWebhook Create(DiscordWebhookClient client, Model model)
+        {
+            var entity = new RestInternalWebhook(client, model);
+            entity.Update(model);
+            return entity;
+        }
+
+        internal void Update(Model model)
+        {
+            if (model.Avatar.IsSpecified)
+                AvatarId = model.Avatar.Value;
+            if (model.GuildId.IsSpecified)
+                GuildId = model.GuildId.Value;
+            if (model.Name.IsSpecified)
+                Name = model.Name.Value;
+        }
+
+        public string GetAvatarUrl(ImageFormat format = ImageFormat.Auto, ushort size = 128)
+           => CDN.GetUserAvatarUrl(Id, AvatarId, size, format);
+
+        public async Task ModifyAsync(Action<WebhookProperties> func, RequestOptions options = null)
+        {
+            var model = await WebhookClientHelper.ModifyAsync(_client, func, options);
+            Update(model);
+        }
+
+        public Task DeleteAsync(RequestOptions options = null)
+            => WebhookClientHelper.DeleteAsync(_client, options);
+
+        public override string ToString() => $"Webhook: {Name}:{Id}";
+        private string DebuggerDisplay => $"Webhook: {Name} ({Id})";
+
+        IUser IWebhook.Creator => null;
+        ITextChannel IWebhook.Channel => null;
+        IGuild IWebhook.Guild => null;
+    }
+}

src/Discord.Net.Webhook/WebhookClientHelper.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Discord.API.Rest;
+using Discord.Rest;
+using ImageModel = Discord.API.Image;
+using WebhookModel = Discord.API.Webhook;
+
+namespace Discord.Webhook
+{
+    internal static class WebhookClientHelper
+    {
+        public static async Task<RestInternalWebhook> GetWebhookAsync(DiscordWebhookClient client, ulong webhookId)
+        {
+            var model = await client.ApiClient.GetWebhookAsync(webhookId);
+            if (model == null)
+                throw new InvalidOperationException("Could not find a webhook for the supplied credentials.");
+            return RestInternalWebhook.Create(client, model);
+        }
+        public static async Task<ulong> SendMessageAsync(DiscordWebhookClient client, 
+            string text, bool isTTS, IEnumerable<Embed> embeds, string username, string avatarUrl, RequestOptions options)
+        {
+            var args = new CreateWebhookMessageParams(text) { IsTTS = isTTS };
+            if (embeds != null)
+                args.Embeds = embeds.Select(x => x.ToModel()).ToArray();
+            if (username != null)
+                args.Username = username;
+            if (avatarUrl != null)
+                args.AvatarUrl = avatarUrl;
+
+            var model = await client.ApiClient.CreateWebhookMessageAsync(client.Webhook.Id, args, options: options).ConfigureAwait(false);
+            return model.Id;
+        }
+#if FILESYSTEM
+        public static async Task<ulong> SendFileAsync(DiscordWebhookClient client, string filePath, string text, bool isTTS, 
+            IEnumerable<Embed> embeds, string username, string avatarUrl, RequestOptions options)
+        {
+            string filename = Path.GetFileName(filePath);
+            using (var file = File.OpenRead(filePath))
+                return await SendFileAsync(client, file, filename, text, isTTS, embeds, username, avatarUrl, options).ConfigureAwait(false);
+        }
+#endif
+        public static async Task<ulong> SendFileAsync(DiscordWebhookClient client, Stream stream, string filename, string text, bool isTTS,
+            IEnumerable<Embed> embeds, string username, string avatarUrl, RequestOptions options)
+        {
+            var args = new UploadWebhookFileParams(stream) { Filename = filename, Content = text, IsTTS = isTTS };
+            if (username != null)
+                args.Username = username;
+            if (avatarUrl != null)
+                args.AvatarUrl = username;
+            if (embeds != null)
+                args.Embeds = embeds.Select(x => x.ToModel()).ToArray();
+            var msg = await client.ApiClient.UploadWebhookFileAsync(client.Webhook.Id, args, options).ConfigureAwait(false);
+            return msg.Id;
+        }
+
+        public static async Task<WebhookModel> ModifyAsync(DiscordWebhookClient client,
+            Action<WebhookProperties> func, RequestOptions options)
+        {
+            var args = new WebhookProperties();
+            func(args);
+            var apiArgs = new ModifyWebhookParams
+            {
+                Avatar = args.Image.IsSpecified ? args.Image.Value?.ToModel() : Optional.Create<ImageModel?>(),
+                Name = args.Name
+            };
+
+            if (!apiArgs.Avatar.IsSpecified && client.Webhook.AvatarId != null)
+                apiArgs.Avatar = new ImageModel(client.Webhook.AvatarId);
+
+            return await client.ApiClient.ModifyWebhookAsync(client.Webhook.Id, apiArgs, options).ConfigureAwait(false);
+        }
+
+        public static async Task DeleteAsync(DiscordWebhookClient client, RequestOptions options)
+        {
+            await client.ApiClient.DeleteWebhookAsync(client.Webhook.Id, options).ConfigureAwait(false);
+        }
+    }
+}