Add endpoint for discord invite

ChaosBot/WebServer/App/DiscordController.cs

@@ -1,8 +1,12 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Threading.Tasks;
+using ChaosBot.Discord;
+using ChaosBot.Repositories;
+using Discord;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Configuration;
 using Newtonsoft.Json;
@@ -49,6 +53,25 @@ namespace ChaosBot.WebServer.App
             return LocalRedirect($"/#/?access_token={responseObject.access_token}");
         }
 
+        [HttpGet("invite")]
+        public IActionResult Invite()
+        {
+            string clientId = Program.AppSettingsHandler.GetValue<string>("Discord:ClientId");
+            const ulong permissions =
+                0x00000020 +  // MANAGE_CHANNELS
+                0x04000000 +  // CHANGE_NICKNAME
+                0x00010000 +  // READ_MESSAGE_HISTORY
+                0x00000800 +  // SEND_MESSAGES
+                0x00002000 +  // MANAGE_MESSAGES
+                0x00008000 +  // ATTACH_FILES
+                0x00040000 +  // USE_EXTERNAL_EMOJIS
+                0x00000040 +  // ADD_REACTIONS
+                0x00000400    // VIEW_CHANNEL
+            ;
+
+            return Redirect($"https://discord.com/oauth2/authorize?client_id={clientId}&scope=bot&permissions={permissions}");
+        }
+
         [HttpGet("user")]
         public IActionResult GetUser()
         {
@@ -77,7 +100,13 @@ namespace ChaosBot.WebServer.App
             string responseString = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
             List<DiscordGuildResponse> userResponse = JsonConvert.DeserializeObject<List<DiscordGuildResponse>>(responseString);
 
-            return Json(userResponse);
+            List<ulong> presentGuilds = DiscordConnect._client.Guilds.Select(g => g.Id).ToList();
+            List<DiscordGuildResponseWithPresence> userResponseWithPresence =
+                userResponse
+                    .Select(guild => guild.AddPresence(presentGuilds.Contains(guild.id)))
+                    .ToList();
+
+            return Json(userResponseWithPresence);
         }
 
         private static DiscordUserResponse GetDiscordUser(string accessToken)
@@ -127,11 +156,30 @@ namespace ChaosBot.WebServer.App
 
     public class DiscordGuildResponse
     {
-        public string id { get; set; }
+        public ulong id { get; set; }
         public string name { get; set; }
         public string icon { get; set; }
         public bool owner { get; set; }
         public int permissions { get; set; }
         public int permissions_new { get; set; }
+
+        public DiscordGuildResponseWithPresence AddPresence(bool presence)
+        {
+            return new DiscordGuildResponseWithPresence
+            {
+                id = id,
+                name = name,
+                icon = icon,
+                owner = owner,
+                permissions = permissions,
+                permissions_new = permissions_new,
+                bot_present = presence
+            };
+        }
+    }
+
+    public class DiscordGuildResponseWithPresence : DiscordGuildResponse
+    {
+        public bool bot_present { get; set; }
     }
 }