feat: Add json signature checker

signature-checker.py

@@ -37,6 +37,24 @@ functions = {
                 "type": "text"
             }
         }
+    },
+    "advancedValidate":{
+        "name": "Validate signature from json",
+        "type": "default",
+        "description": "Validate that a message was signed by a specific domain using json format",
+        "params": {
+            "json": {
+                "name": "JSON signature object",
+                "type": "longText",
+            }
+        },
+        "returns": {
+            "status": 
+            {
+                "name": "Validity of the signature",
+                "type": "text"
+            }
+        }
     }
 }
 
@@ -47,4 +65,22 @@ def validate(params, authentication):
     
     if account.verifyMessageWithName(domain, signature,message):
         return {"status": "Valid"}
-    return {"status": "Invalid signature"}
+    return {"status": "Invalid signature"}
+
+def advancedValidate(params, authentication):
+    data = params["json"]
+
+    try:
+        data = json.loads(data)
+    except:
+        return {"status": "Invalid JSON"}
+
+    if "domain" in data and "message" in data and "signature" in data:
+        domain = data["domain"]
+        message = data["message"]
+        signature = data["signature"]
+        
+        if account.verifyMessageWithName(domain, signature,message):
+            return {"status": "Valid"}
+        return {"status": "Invalid signature"}
+    return {"status": "Invalid JSON"}