add creator to the event

wip on preminter test

wip on scanning for the event; currently we cannot deploy the contract cause its too large :(

added test that shows how to recover the signer

package/hashTypedData.ts

@@ -0,0 +1,247 @@
+import { AbiParameter } from "abitype";
+import {
+  Address,
+  HashTypedDataParameters,
+  Hex,
+  TypedData,
+  TypedDataDomain,
+  TypedDataParameter,
+  concat,
+  encodeAbiParameters,
+  keccak256,
+  toHex,
+} from "viem";
+
+export type MessageTypeProperty = {
+  name: string;
+  type: string;
+};
+
+export function hashedTypedDataV4<
+  const TTypedData extends TypedData | { [key: string]: unknown },
+  TPrimaryType extends string = string
+>({
+  structHash,
+  chainId,
+  verifyingContract,
+  _types,
+  name,
+  version,
+}: {
+  structHash: `0x${string}`;
+  verifyingContract: Address;
+  chainId: number;
+  _types: HashTypedDataParameters<TTypedData, TPrimaryType>["types"];
+  name: string;
+  version: string;
+}) {
+  const domain: TypedDataDomain = {
+    chainId,
+    name,
+    version,
+    verifyingContract,
+  };
+
+  const types = {
+    EIP712Domain: getTypesForEIP712Domain({ domain }),
+    ...(_types as TTypedData),
+  };
+
+  const parts: Hex[] = ["0x1901"];
+
+  // hash the eip 712 domain, verifying contract, and chain id.
+  parts.push(
+    hashDomain({
+      domain,
+      types: types as Record<string, MessageTypeProperty[]>,
+    })
+  );
+
+  // append the already hashed message
+  parts.push(structHash);
+
+  return keccak256(concat(parts));
+}
+
+export function hashDomain({
+  domain,
+  types,
+}: {
+  domain: TypedDataDomain;
+  types: Record<string, MessageTypeProperty[]>;
+}) {
+  return hashStruct({
+    data: domain,
+    primaryType: "EIP712Domain",
+    types,
+  });
+}
+
+function hashStruct({
+  data,
+  primaryType,
+  types,
+}: {
+  data: Record<string, unknown>;
+  primaryType: string;
+  types: Record<string, MessageTypeProperty[]>;
+}) {
+  const encoded = encodeData({
+    data,
+    primaryType,
+    types,
+  });
+  return keccak256(encoded);
+}
+
+function encodeData({
+  data,
+  primaryType,
+  types,
+}: {
+  data: Record<string, unknown>;
+  primaryType: string;
+  types: Record<string, MessageTypeProperty[]>;
+}) {
+  const encodedTypes: AbiParameter[] = [{ type: "bytes32" }];
+  const encodedValues: unknown[] = [hashType({ primaryType, types })];
+
+  for (const field of types[primaryType]!) {
+    const [type, value] = encodeField({
+      types,
+      name: field.name,
+      type: field.type,
+      value: data[field.name],
+    });
+    encodedTypes.push(type);
+    encodedValues.push(value);
+  }
+
+  return encodeAbiParameters(encodedTypes, encodedValues);
+}
+
+function hashType({
+  primaryType,
+  types,
+}: {
+  primaryType: string;
+  types: Record<string, MessageTypeProperty[]>;
+}) {
+  const encodedHashType = toHex(encodeType({ primaryType, types }));
+  return keccak256(encodedHashType);
+}
+
+function encodeType({
+  primaryType,
+  types,
+}: {
+  primaryType: string;
+  types: Record<string, MessageTypeProperty[]>;
+}) {
+  let result = "";
+  const unsortedDeps = findTypeDependencies({ primaryType, types });
+  unsortedDeps.delete(primaryType);
+
+  const deps = [primaryType, ...Array.from(unsortedDeps).sort()];
+  for (const type of deps) {
+    result += `${type}(${types[type]!.map(
+      ({ name, type: t }) => `${t} ${name}`
+    ).join(",")})`;
+  }
+
+  return result;
+}
+
+function findTypeDependencies(
+  {
+    primaryType: primaryType_,
+    types,
+  }: {
+    primaryType: string;
+    types: Record<string, MessageTypeProperty[]>;
+  },
+  results: Set<string> = new Set()
+): Set<string> {
+  const match = primaryType_.match(/^\w*/u);
+  const primaryType = match?.[0]!;
+  if (results.has(primaryType) || types[primaryType] === undefined) {
+    return results;
+  }
+
+  results.add(primaryType);
+
+  for (const field of types[primaryType]!) {
+    findTypeDependencies({ primaryType: field.type, types }, results);
+  }
+  return results;
+}
+
+function encodeField({
+  types,
+  name,
+  type,
+  value,
+}: {
+  types: Record<string, MessageTypeProperty[]>;
+  name: string;
+  type: string;
+  value: any;
+}): [type: AbiParameter, value: any] {
+  if (types[type] !== undefined) {
+    return [
+      { type: "bytes32" },
+      keccak256(encodeData({ data: value, primaryType: type, types })),
+    ];
+  }
+
+  if (type === "bytes") {
+    const prepend = value.length % 2 ? "0" : "";
+    value = `0x${prepend + value.slice(2)}`;
+    return [{ type: "bytes32" }, keccak256(value)];
+  }
+
+  if (type === "string") return [{ type: "bytes32" }, keccak256(toHex(value))];
+
+  if (type.lastIndexOf("]") === type.length - 1) {
+    const parsedType = type.slice(0, type.lastIndexOf("["));
+    const typeValuePairs = (value as [AbiParameter, any][]).map((item) =>
+      encodeField({
+        name,
+        type: parsedType,
+        types,
+        value: item,
+      })
+    );
+    return [
+      { type: "bytes32" },
+      keccak256(
+        encodeAbiParameters(
+          typeValuePairs.map(([t]) => t),
+          typeValuePairs.map(([, v]) => v)
+        )
+      ),
+    ];
+  }
+
+  return [{ type }, value];
+}
+
+export function getTypesForEIP712Domain({
+  domain,
+}: {
+  domain?: TypedDataDomain;
+}): TypedDataParameter[] {
+  return [
+    typeof domain?.name === "string" && { name: "name", type: "string" },
+    domain?.version && { name: "version", type: "string" },
+    typeof domain?.chainId === "number" && {
+      name: "chainId",
+      type: "uint256",
+    },
+    domain?.verifyingContract && {
+      name: "verifyingContract",
+      type: "address",
+    },
+    domain?.salt && { name: "salt", type: "bytes32" },
+  ].filter(Boolean) as TypedDataParameter[];
+}