Relay custom votes to a webhook (#18561)

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>
Co-authored-by: DrSmugleaf <drsmugleaf@gmail.com>

Content.Server/Discord/DiscordWebhook.cs

@@ -1,5 +1,7 @@
-using System.Net.Http;
+using System.Net.Http;
 using System.Net.Http.Json;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 using System.Threading.Tasks;
 
 namespace Content.Server.Discord;
@@ -66,7 +68,7 @@ public sealed class DiscordWebhook : IPostInjectInit
     public async Task<HttpResponseMessage> CreateMessage(WebhookIdentifier identifier, WebhookPayload payload)
     {
         var url = $"{GetUrl(identifier)}?wait=true";
-        return await _http.PostAsJsonAsync(url, payload);
+        return await _http.PostAsJsonAsync(url, payload, new JsonSerializerOptions { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull });
     }
 
     /// <summary>
@@ -91,7 +93,7 @@ public sealed class DiscordWebhook : IPostInjectInit
     public async Task<HttpResponseMessage> EditMessage(WebhookIdentifier identifier, ulong messageId, WebhookPayload payload)
     {
         var url = $"{GetUrl(identifier)}/messages/{messageId}";
-        return await _http.PatchAsJsonAsync(url, payload);
+        return await _http.PatchAsJsonAsync(url, payload, new JsonSerializerOptions { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull });
     }
 
     void IPostInjectInit.PostInject()

Content.Server/Discord/WebhookEmbed.cs

@@ -1,10 +1,13 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace Content.Server.Discord;
 
 // https://discord.com/developers/docs/resources/channel#embed-object-embed-structure
 public struct WebhookEmbed
 {
+    [JsonPropertyName("title")]
+    public string Title { get; set; } = "";
+
     [JsonPropertyName("description")]
     public string Description { get; set; } = "";
 
@@ -14,6 +17,10 @@ public struct WebhookEmbed
     [JsonPropertyName("footer")]
     public WebhookEmbedFooter? Footer { get; set; } = null;
 
+
+    [JsonPropertyName("fields")]
+    public List<WebhookEmbedField> Fields { get; set; } = default!;
+
     public WebhookEmbed()
     {
     }

Content.Server/Discord/WebhookEmbedField.cs

@@ -0,0 +1,20 @@
+using System.Text.Json.Serialization;
+
+namespace Content.Server.Discord;
+
+// https://discord.com/developers/docs/resources/channel#embed-object-embed-field-structure
+public struct WebhookEmbedField
+{
+    [JsonPropertyName("name")]
+    public string Name { get; set; } = "";
+
+    [JsonPropertyName("value")]
+    public string Value { get; set; } = "";
+
+    [JsonPropertyName("inline")]
+    public bool Inline { get; set; } = true;
+
+    public WebhookEmbedField()
+    {
+    }
+}

Content.Server/Discord/WebhookMentions.cs

@@ -1,4 +1,4 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace Content.Server.Discord;
 

Content.Server/Discord/WebhookPayload.cs

@@ -1,4 +1,4 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace Content.Server.Discord;
 
@@ -9,13 +9,13 @@ public struct WebhookPayload
     ///     The message to send in the webhook. Maximum of 2000 characters.
     /// </summary>
     [JsonPropertyName("content")]
-    public string Content { get; set; } = "";
+    public string? Content { get; set; }
 
     [JsonPropertyName("username")]
     public string? Username { get; set; }
 
     [JsonPropertyName("avatar_url")]
-    public string? AvatarUrl { get; set; } = "";
+    public string? AvatarUrl { get; set; }
 
     [JsonPropertyName("embeds")]
     public List<WebhookEmbed>? Embeds { get; set; } = null;