Use users/@me for token validation

src/Discord.Net/API/DiscordAPIClient.cs

@@ -351,12 +351,6 @@ namespace Discord.API
             await _sentGatewayMessageEvent.InvokeAsync(opCode).ConfigureAwait(false);
         }
 
-        //Application
-        public async Task<Application> GetMyApplicationInfoAsync(RequestOptions options = null)
-        {
-            return await SendAsync<Application>("GET", "oauth2/applications/@me", options: options).ConfigureAwait(false);
-        }
-
         //Auth
         public async Task ValidateTokenAsync(RequestOptions options = null)
         {
@@ -1176,7 +1170,7 @@ namespace Discord.API
         }
 
         //Current User/DMs
-        public async Task<User> GetSelfAsync(RequestOptions options = null)
+        public async Task<User> GetMyUserAsync(RequestOptions options = null)
         {
             return await SendAsync<User>("GET", "users/@me", options: options).ConfigureAwait(false);
         }
@@ -1192,6 +1186,10 @@ namespace Discord.API
         {
             return await SendAsync<IReadOnlyCollection<UserGuild>>("GET", "users/@me/guilds", options: options).ConfigureAwait(false);
         }
+        public async Task<Application> GetMyApplicationAsync(RequestOptions options = null)
+        {
+            return await SendAsync<Application>("GET", "oauth2/applications/@me", options: options).ConfigureAwait(false);
+        }
         public async Task<User> ModifySelfAsync(ModifyCurrentUserParams args, RequestOptions options = null)
         {
             Preconditions.NotNull(args, nameof(args));

src/Discord.Net/DiscordRestClient.cs

@@ -94,7 +94,14 @@ namespace Discord
                 {
                     try
                     {
-                        await ApiClient.ValidateTokenAsync().ConfigureAwait(false);
+                        var user = await GetCurrentUserAsync().ConfigureAwait(false);
+                        if (user == null) //Is using a cached DiscordClient
+                            user = new SelfUser(this, await ApiClient.GetMyUserAsync().ConfigureAwait(false));
+
+                        if (user.IsBot && tokenType == TokenType.User)
+                            throw new InvalidOperationException($"A bot token used provided with {nameof(TokenType)}.{nameof(TokenType.User)}");
+                        else if (!user.IsBot && tokenType == TokenType.Bot) //Discord currently sends a 401 in this case
+                            throw new InvalidOperationException($"A user token used provided with {nameof(TokenType)}.{nameof(TokenType.Bot)}");
                     }
                     catch (HttpException ex)
                     {
@@ -146,7 +153,7 @@ namespace Discord
         /// <inheritdoc />
         public async Task<IApplication> GetApplicationInfoAsync()
         {
-            var model = await ApiClient.GetMyApplicationInfoAsync().ConfigureAwait(false);
+            var model = await ApiClient.GetMyApplicationAsync().ConfigureAwait(false);
             return new Application(this, model);
         }
         
@@ -266,12 +273,13 @@ namespace Discord
             var user = _currentUser;
             if (user == null)
             {
-                var model = await ApiClient.GetSelfAsync().ConfigureAwait(false);
+                var model = await ApiClient.GetMyUserAsync().ConfigureAwait(false);
                 user = new SelfUser(this, model);
                 _currentUser = user;
             }
             return user;
         }
+
         /// <inheritdoc />
         public virtual async Task<IReadOnlyCollection<IUser>> QueryUsersAsync(string query, int limit)
         {

src/Discord.Net/Entities/Application.cs

@@ -42,7 +42,7 @@ namespace Discord
         {
             if (IsAttached) throw new NotSupportedException();
 
-            var response = await Discord.ApiClient.GetMyApplicationInfoAsync().ConfigureAwait(false);
+            var response = await Discord.ApiClient.GetMyApplicationAsync().ConfigureAwait(false);
             if (response.Id != Id)
                 throw new InvalidOperationException("Unable to update this object from a different application token.");
             Update(response, UpdateSource.Rest);

src/Discord.Net/Entities/Users/SelfUser.cs

@@ -43,7 +43,7 @@ namespace Discord
         {
             if (IsAttached) throw new NotSupportedException();
 
-            var model = await Discord.ApiClient.GetSelfAsync().ConfigureAwait(false);
+            var model = await Discord.ApiClient.GetMyUserAsync().ConfigureAwait(false);
             Update(model, UpdateSource.Rest);
         }
         public async Task ModifyAsync(Action<ModifyCurrentUserParams> func)