Group management methods

composer.json

@@ -15,7 +15,8 @@
         }
     ],
     "require": {
-        "psr/http-client": "^1.0"
+        "psr/http-client": "^1.0",
+        "psr/http-message": "^2.0"
     },
     "require-dev": {
         "guzzlehttp/guzzle": "^7.9",

src/SlotDbClient.php

@@ -162,10 +162,23 @@ class SlotDbClient
         return $data;
     }
 
-    public function updateGroup(string $groupId, array $props): array
+    public function createGroup(string $groupId, array $props): array
+    {
+        $res = $this->post("/groups", $props);
+        $data = json_decode($res->getBody(), true);
+        if (is_array($data) && isset($data['error'])) {
+            throw new GroupException($data['error']);
+        }
+        return $data;
+    }
+
+    public function updateGroup(string $groupId, array $props): bool
     {
         $res = $this->post("/group/{$groupId}", $props);
         $data = json_decode($res->getBody(), true);
+        if (is_array($data) && isset($data['error'])) {
+            throw new GroupException($data['error']);
+        }
         return $data;
     }
 
@@ -196,3 +209,6 @@ class SlotDbClient
     }
 
 }
+
+class GroupException extends \RuntimeException
+{}