Fix command sending error handling and bad assertion order

app/Http/Controllers/Api/Client/Servers/CommandController.php

@@ -5,13 +5,13 @@ namespace Pterodactyl\Http\Controllers\Api\Client\Servers;
 use Illuminate\Http\Response;
 use Pterodactyl\Models\Server;
 use Psr\Http\Message\ResponseInterface;
-use GuzzleHttp\Exception\ClientException;
 use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\BadResponseException;
+use Symfony\Component\HttpKernel\Exception\HttpException;
 use Pterodactyl\Repositories\Wings\DaemonCommandRepository;
 use Pterodactyl\Http\Controllers\Api\Client\ClientApiController;
 use Pterodactyl\Http\Requests\Api\Client\Servers\SendCommandRequest;
 use Pterodactyl\Exceptions\Http\Connection\DaemonConnectionException;
-use Symfony\Component\HttpKernel\Exception\PreconditionFailedHttpException;
 
 class CommandController extends ClientApiController
 {
@@ -47,9 +47,14 @@ class CommandController extends ClientApiController
         try {
             $this->repository->setServer($server)->send($request->input('command'));
         } catch (RequestException $exception) {
-            if ($exception instanceof ClientException) {
+            if ($exception instanceof BadResponseException) {
-                if ($exception->getResponse() instanceof ResponseInterface && $exception->getResponse()->getStatusCode() === 412) {
+                if (
-                    throw new PreconditionFailedHttpException('Server is not online.');
+                    $exception->getResponse() instanceof ResponseInterface
+                    && $exception->getResponse()->getStatusCode() === Response::HTTP_BAD_GATEWAY
+                ) {
+                    throw new HttpException(
+                        Response::HTTP_BAD_GATEWAY, 'Server must be online in order to send commands.', $exception
+                    );
                 }
             }
 

app/Repositories/Wings/DaemonCommandRepository.php

@@ -16,7 +16,7 @@ class DaemonCommandRepository extends DaemonRepository
      */
     public function send($command): ResponseInterface
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         return $this->getHttpClient()->post(
             sprintf('/api/servers/%s/commands', $this->server->uuid),

app/Repositories/Wings/DaemonFileRepository.php

@@ -37,7 +37,7 @@ class DaemonFileRepository extends DaemonRepository
      */
     public function getContent(string $path, int $notLargerThan = null): string
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         $response = $this->getHttpClient()->get(
             sprintf('/api/servers/%s/files/contents', $this->server->uuid),
@@ -69,7 +69,7 @@ class DaemonFileRepository extends DaemonRepository
      */
     public function putContent(string $path, string $content): ResponseInterface
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         return $this->getHttpClient()->post(
             sprintf('/api/servers/%s/files/write', $this->server->uuid),
@@ -90,7 +90,7 @@ class DaemonFileRepository extends DaemonRepository
      */
     public function getDirectory(string $path): array
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         $response = $this->getHttpClient()->get(
             sprintf('/api/servers/%s/files/list-directory', $this->server->uuid),
@@ -111,7 +111,7 @@ class DaemonFileRepository extends DaemonRepository
      */
     public function createDirectory(string $name, string $path): ResponseInterface
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         return $this->getHttpClient()->post(
             sprintf('/api/servers/%s/files/create-directory', $this->server->uuid),
@@ -133,7 +133,7 @@ class DaemonFileRepository extends DaemonRepository
      */
     public function renameFile(string $from, string $to): ResponseInterface
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         return $this->getHttpClient()->put(
             sprintf('/api/servers/%s/files/rename', $this->server->uuid),
@@ -154,7 +154,7 @@ class DaemonFileRepository extends DaemonRepository
      */
     public function copyFile(string $location): ResponseInterface
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         return $this->getHttpClient()->post(
             sprintf('/api/servers/%s/files/copy', $this->server->uuid),
@@ -174,7 +174,7 @@ class DaemonFileRepository extends DaemonRepository
      */
     public function deleteFile(string $location): ResponseInterface
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         return $this->getHttpClient()->post(
             sprintf('/api/servers/%s/files/delete', $this->server->uuid),

app/Repositories/Wings/DaemonRepository.php

@@ -71,7 +71,7 @@ abstract class DaemonRepository
      */
     public function getHttpClient(array $headers = []): Client
     {
-        Assert::isInstanceOf(Node::class, $this->node);
+        Assert::isInstanceOf($this->node, Node::class);
 
         return new Client([
             'verify' => $this->app->environment('production'),

app/Repositories/Wings/DaemonServerRepository.php

@@ -17,7 +17,7 @@ class DaemonServerRepository extends DaemonRepository
      */
     public function getDetails(): array
     {
-        Assert::isInstanceOf(Server::class, $this->server);
+        Assert::isInstanceOf($this->server, Server::class);
 
         try {
             $response = $this->getHttpClient()->get(