Add Various Type Guards w. Tests

src/beta.ts

@@ -4,10 +4,9 @@ import {
   relaySignedTransaction,
   toPayload,
 } from "./utils/transaction";
-import { NearEncodedSignRequest, signMethods } from "./types";
+import { isSignMethod, NearEncodedSignRequest, signMethods } from "./types";
 import { NearEthAdapter } from "./chains/ethereum";
 import { Web3WalletTypes } from "@walletconnect/web3wallet";
-import { isSignMethod } from "./guards";
 import { requestRouter } from "./utils/request";
 
 function stripEip155Prefix(eip155Address: string): string {

src/index.ts

@@ -10,7 +10,6 @@ import {
 
 export * from "./chains/ethereum";
 export * from "./chains/near";
-export * from "./guards";
 export * from "./mpcContract";
 export * from "./network";
 export * from "./types";

src/types/guards.ts

@@ -0,0 +1,106 @@
+import {
+  Hex,
+  isAddress,
+  parseTransaction,
+  serializeTransaction,
+  TransactionSerializable,
+  TypedDataDomain,
+} from "viem";
+import { EIP712TypedData, SignMethod, TypedMessageTypes } from ".";
+
+export function isSignMethod(method: unknown): method is SignMethod {
+  return (
+    typeof method === "string" &&
+    [
+      "eth_sign",
+      "personal_sign",
+      "eth_sendTransaction",
+      "eth_signTypedData",
+      "eth_signTypedData_v4",
+    ].includes(method)
+  );
+}
+
+const isTypedDataDomain = (domain: unknown): domain is TypedDataDomain => {
+  if (typeof domain !== "object" || domain === null) return false;
+
+  const candidate = domain as Record<string, unknown>;
+
+  // Check that all properties, if present, are of the correct type
+  return Object.entries(candidate).every(([key, value]) => {
+    switch (key) {
+      case "chainId":
+        return typeof value === "undefined" || typeof value === "number";
+      case "name":
+      case "version":
+        return typeof value === "undefined" || typeof value === "string";
+      case "verifyingContract":
+        return (
+          typeof value === "undefined" ||
+          (typeof value === "string" && isAddress(value))
+        );
+      case "salt":
+        return typeof value === "undefined" || typeof value === "string";
+      default:
+        return false; // Reject unknown properties
+    }
+  });
+};
+
+const isTypedMessageTypes = (types: unknown): types is TypedMessageTypes => {
+  if (typeof types !== "object" || types === null) return false;
+
+  return Object.entries(types).every(([_, value]) => {
+    return (
+      Array.isArray(value) &&
+      value.every(
+        (item) =>
+          typeof item === "object" &&
+          item !== null &&
+          "name" in item &&
+          "type" in item &&
+          typeof item.name === "string" &&
+          typeof item.type === "string"
+      )
+    );
+  });
+};
+
+export const isEIP712TypedData = (obj: unknown): obj is EIP712TypedData => {
+  if (typeof obj !== "object" || obj === null) return false;
+
+  const candidate = obj as Record<string, unknown>;
+
+  return (
+    "domain" in candidate &&
+    "types" in candidate &&
+    "message" in candidate &&
+    "primaryType" in candidate &&
+    isTypedDataDomain(candidate.domain) &&
+    isTypedMessageTypes(candidate.types) &&
+    typeof candidate.message === "object" &&
+    candidate.message !== null &&
+    typeof candidate.primaryType === "string"
+  );
+};
+
+// Cheeky attempt to serialize. return true if successful!
+export function isTransactionSerializable(
+  data: unknown
+): data is TransactionSerializable {
+  try {
+    serializeTransaction(data as TransactionSerializable);
+    return true;
+  } catch (error) {
+    return false;
+  }
+}
+
+export function isRlpHex(data: unknown): data is Hex {
+  try {
+    parseTransaction(data as Hex);
+    return true;
+  } catch (error) {
+    return false;
+  }
+}

src/types.ts → src/types/index.ts

@@ -1,4 +1,4 @@
-import { IMpcContract } from "./mpcContract";
+import { IMpcContract } from "../mpcContract";
 import {
   Address,
   Hash,
@@ -9,6 +9,8 @@ import {
   TypedDataDomain,
 } from "viem";
 
+export * from "./guards";
+
 /**
  * Borrowed from @near-wallet-selector/core
  * https://github.com/near/wallet-selector/blob/01081aefaa3c96ded9f83a23ecf0d210a4b64590/packages/core/src/lib/wallet/transactions.types.ts#L12
@@ -169,11 +171,11 @@ export interface MessageData {
   message: SignableMessage;
 }
 
-interface TypedDataTypes {
+export interface TypedDataTypes {
   name: string;
   type: string;
 }
-type TypedMessageTypes = {
+export type TypedMessageTypes = {
   [key: string]: TypedDataTypes[];
 };
 

tests/unit/types.guards.test.ts

@@ -0,0 +1,135 @@
+import { TransactionSerializable } from "viem";
+import {
+  isEIP712TypedData,
+  isRlpHex,
+  isSignMethod,
+  isTransactionSerializable,
+} from "../../src/";
+
+const validEIP1559Transaction: TransactionSerializable = {
+  to: "0x70997970C51812dc3A010C7d01b50e0d17dc79C8",
+  value: BigInt(1000000000000000000), // 1 ETH
+  chainId: 1,
+  maxFeePerGas: 1n,
+};
+
+const commonInvalidCases = [
+  null,
+  undefined,
+  {},
+  { to: "invalid-address" },
+  { value: "not-a-bigint" },
+  { chainId: "not-a-number" },
+  "random string",
+  123,
+  [],
+];
+
+describe("SignMethod", () => {
+  it("returns true for all valid SignMethods", async () => {
+    [
+      "eth_sign",
+      "personal_sign",
+      "eth_sendTransaction",
+      "eth_signTypedData",
+      "eth_signTypedData_v4",
+    ].map((item) => expect(isSignMethod(item)).toBe(true));
+  });
+
+  it("returns false for invalid data inputs", async () => {
+    ["poop", undefined, false, 1, {}].map((item) =>
+      expect(isSignMethod(item)).toBe(false)
+    );
+  });
+});
+describe("isEIP712TypedData", () => {
+  it("returns true for valid EIP712TypedData", async () => {
+    const message = {
+      from: {
+        name: "Cow",
+        wallet: "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826",
+      },
+      to: {
+        name: "Bob",
+        wallet: "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB",
+      },
+      contents: "Hello, Bob!",
+    } as const;
+
+    const domain = {
+      name: "Ether Mail",
+      version: "1",
+      chainId: 1,
+      verifyingContract: "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC",
+    } as const;
+
+    const types = {
+      Person: [
+        { name: "name", type: "string" },
+        { name: "wallet", type: "address" },
+      ],
+      Mail: [
+        { name: "from", type: "Person" },
+        { name: "to", type: "Person" },
+        { name: "contents", type: "string" },
+      ],
+    } as const;
+
+    const typedData = {
+      types,
+      primaryType: "Mail",
+      message,
+      domain,
+    } as const;
+    expect(isEIP712TypedData(typedData)).toBe(true);
+  });
+
+  it("returns false for invalid data inputs", async () => {
+    commonInvalidCases.map((item) =>
+      expect(isEIP712TypedData(item)).toBe(false)
+    );
+  });
+});
+
+describe("isTransactionSerializable", () => {
+  it("should return true for valid transaction data", () => {
+    expect(isTransactionSerializable(validEIP1559Transaction)).toBe(true);
+  });
+
+  it("should return false for invalid transaction data", () => {
+    commonInvalidCases.forEach((testCase) => {
+      expect(isTransactionSerializable(testCase)).toBe(false);
+    });
+  });
+});
+
+describe("isRlpHex", () => {
+  it("should return true for valid RLP-encoded transaction hex", () => {
+    // This is an example of a valid RLP-encoded transaction hex:
+
+    // serializeTransaction(validEIP1559Transaction)
+    const validRlpHex =
+      "0x02e501808001809470997970c51812dc3a010c7d01b50e0d17dc79c8880de0b6b3a764000080c0";
+    expect(isRlpHex(validRlpHex)).toBe(true);
+  });
+
+  it("should return false for invalid RLP hex data", () => {
+    const invalidCases = [
+      null,
+      undefined,
+      {},
+      "not-a-hex",
+      "0x", // empty hex
+      "0x1234", // too short
+      "0xinvalid",
+      123,
+      [],
+      // Invalid RLP structure but valid hex
+      "0x1234567890abcdef",
+    ];
+
+    invalidCases.forEach((testCase) => {
+      expect(isRlpHex(testCase)).toBe(false);
+    });
+  });
+});

tests/unit/utils.kdf.test.ts → tests/unit/utils/kdf.test.ts

@@ -2,7 +2,7 @@ import {
   najPublicKeyStrToUncompressedHexPoint,
   deriveChildPublicKey,
   uncompressedHexPointToEvmAddress,
-} from "../../src/utils/kdf";
+} from "../../../src/utils/kdf";
 
 const ROOT_PK =
   "secp256k1:54hU5wcCmVUPFWLDALXMh1fFToZsVXrx9BbTbHzSfQq1Kd1rJZi52iPa4QQxo6s5TgjWqgpY8HamYuUDzG6fAaUq";

tests/unit/utils.mock-sign.test.ts → tests/unit/utils/mock-sign.test.ts

@@ -1,5 +1,5 @@
 import { recoverMessageAddress } from "viem";
-import { mockAdapter } from "../../src/utils/mock-sign";
+import { mockAdapter } from "../../../src/utils/mock-sign";
 
 describe("Mock Signing", () => {
   it("MockAdapter", async () => {

tests/unit/utils.signature.test.ts → tests/unit/utils/signature.test.ts

@@ -2,7 +2,7 @@ import {
   signatureFromOutcome,
   signatureFromTxHash,
   transformSignature,
-} from "../../src/utils/signature";
+} from "../../../src/utils/signature";
 
 describe("utility: get Signature", () => {
   const url: string = "https://archival-rpc.testnet.near.org";

tests/unit/utils.transaction.test.ts → tests/unit/utils/transaction.test.ts

@@ -1,12 +1,12 @@
 import { zeroAddress } from "viem";
-import { Network, TransactionWithSignature } from "../../src";
+import { Network, TransactionWithSignature } from "../../../src";
 import {
   buildTxPayload,
   addSignature,
   toPayload,
   populateTx,
   fromPayload,
-} from "../../src/utils/transaction";
+} from "../../../src/utils/transaction";
 
 describe("Transaction Builder Functions", () => {
   it("buildTxPayload", async () => {