Add Image property to Guild Scheduled Events (#2151)

* Add Image property to create and modify events

* Add CDN routes to get cover image

* Update banner names

* Update CDN.cs

* Update IGuildScheduledEvent.cs

src/Discord.Net.Core/CDN.cs

@@ -208,6 +208,18 @@ namespace Discord
         public static string GetStickerUrl(ulong stickerId, StickerFormatType format = StickerFormatType.Png)
             => $"{DiscordConfig.CDNUrl}stickers/{stickerId}.{FormatToExtension(format)}";
 
+        /// <summary>
+        ///     Returns an events cover image url.
+        /// </summary>
+        /// <param name="guildId">The guild id that the event is in.</param>
+        /// <param name="eventId">The id of the event.</param>
+        /// <param name="assetId">The id of the cover image asset.</param>
+        /// <param name="format">The format of the image.</param>
+        /// <param name="size">The size of the image.</param>
+        /// <returns></returns>
+        public static string GetEventCoverImageUrl(ulong guildId, ulong eventId, string assetId, ImageFormat format = ImageFormat.Auto, ushort size = 1024)
+            => $"{DiscordConfig.CDNUrl}guild-events/{guildId}/{eventId}/{assetId}.{FormatToExtension(format, assetId)}?size={size}";
+
         private static string FormatToExtension(StickerFormatType format)
         {
             return format switch

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

@@ -54,5 +54,10 @@ namespace Discord
         ///     Gets or sets the status of the event.
         /// </summary>
         public Optional<GuildScheduledEventStatus> Status { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the banner image of the event.
+        /// </summary>
+        public Optional<Image?> CoverImage { get; set; }
     }
 }

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

@@ -1105,6 +1105,7 @@ namespace Discord
         /// </param>
         /// <param name="speakers">A collection of speakers for the event.</param>
         /// <param name="location">The location of the event; links are supported</param>
+        /// <param name="coverImage">The optional banner image for the event.</param>
         /// <param name="options">The options to be used when sending the request.</param>
         /// <returns>
         ///     A task that represents the asynchronous create operation.
@@ -1118,6 +1119,7 @@ namespace Discord
             DateTimeOffset? endTime = null,
             ulong? channelId = null,
             string location = null,
+            Image? coverImage = null,
             RequestOptions options = null);
 
         /// <summary>

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

@@ -39,6 +39,11 @@ namespace Discord
         /// </remarks>
         string Description { get; }
 
+        /// <summary>
+        ///     Gets the banner asset id of the event.
+        /// </summary>
+        string CoverImageId { get; }
+
         /// <summary>
         ///     Gets the start time of the event.
         /// </summary>
@@ -80,6 +85,14 @@ namespace Discord
         /// </summary>
         int? UserCount { get; }
 
+        /// <summary>
+        ///     Gets this events banner image url.
+        /// </summary>
+        /// <param name="format">The format to return.</param>
+        /// <param name="size">The size of the image to return in. This can be any power of two between 16 and 2048.
+        /// <returns>The cover images url.</returns>
+        string GetCoverImageUrl(ImageFormat format = ImageFormat.Auto, ushort size = 1024);
+
         /// <summary>
         ///     Starts the event.
         /// </summary>