Package com.swmansion.starknet.data

Class TypedData

  • All Implemented Interfaces:
    @Serializable() 
public final class TypedData

    Sign message for off-chain usage. Follows standard proposed here.

    String typedDataString = """
{
   "types": {
       "StarkNetDomain": [
           {"name": "name", "type": "string"},
           {"name": "version", "type": "felt"},
           {"name": "chainId", "type": "felt"}
       ],
       "Airdrop": [
           {"name": "address", "type": "felt"},
           {"name": "amount", "type": "felt"}
       ],
       "Validate": [
           {"name": "id", "type": "felt"},
           {"name": "from", "type": "felt"},
           {"name": "amount", "type": "felt"},
           {"name": "nameGamer", "type": "string"},
           {"name": "endDate", "type": "felt"},
           {"name": "itemsAuthorized", "type": "felt*"},
           {"name": "chkFunction", "type": "selector"},
           {"name": "rootList", "type": "merkletree", "contains": "Airdrop"}
       ]
   },
   "primaryType": "Validate",
   "domain": {
       "name": "myDapp",
       "version": "1",
       "chainId": "SN_SEPOLIA"
   },
   "message": {
       "id": "0x0000004f000f",
       "from": "0x2c94f628d125cd0e86eaefea735ba24c262b9a441728f63e5776661829a4066",
       "amount": "400",
       "nameGamer": "Hector26",
       "endDate": "0x27d32a3033df4277caa9e9396100b7ca8c66a4ef8ea5f6765b91a7c17f0109c",
       "itemsAuthorized": ["0x01", "0x03", "0x0a", "0x0e"],
       "chkFunction": "check_authorization",
       "rootList": [
           {
               "address": "0x69b49c2cc8b16e80e86bfc5b0614a59aa8c9b601569c7b80dde04d3f3151b79",
               "amount": "1554785"
           },
           {
               "address": "0x7447084f620ba316a42c72ca5b8eefb3fe9a05ca5fe6430c65a69ecc4349b3b",
               "amount": "2578248"
           },
           {
               "address": "0x3cad9a072d3cf29729ab2fad2e08972b8cfde01d4979083fb6d15e8e66f8ab1",
               "amount": "4732581"
           },
           {
               "address": "0x7f14339f5d364946ae5e27eccbf60757a5c496bf45baf35ddf2ad30b583541a",
               "amount": "913548"
           }
       ]
   }
}
""";

// Create a TypedData instance from string
TypedData typedData = TypedData.fromJsonString(typedDataString);

// Create a string from TypedData instance
TypedData typedData = new TypedData(...);
String typedDataString = typedData.toJsonString();

// Get a message hash
Felt messageHash = typedData.getMessageHash(accountAddress);