fix eth addr validation

apps/web/utils/web3.ts

@@ -1,7 +1,14 @@
 import { Chain } from "viem";
+import { isAddress } from "viem";
 import * as chains from "viem/chains";
 import { ChainId } from "@/types";
 
+/**
+ * Gets the Viem chain configuration for a given chain ID
+ * @param chainId The chain ID to look up
+ * @returns The Chain configuration object
+ * @throws Error if chain ID is not found
+ */
 export function getViemChain(chainId: ChainId): Chain {
   for (const chain of Object.values(chains)) {
     if ("id" in chain) {
@@ -14,4 +21,56 @@ export function getViemChain(chainId: ChainId): Chain {
   throw new Error(`Chain with id ${chainId} not found`);
 }
 
-export const isENS = (address = "") => /.+\.eth$/i.test(address);
+/**
+ * Validates if a string is a valid ENS name
+ * Follows ENS naming standards:
+ * - Must end with .eth
+ * - Min 3 characters, max 255 characters
+ * - Can contain lowercase letters, numbers, and hyphens
+ * - Cannot start or end with a hyphen
+ * - Cannot have consecutive hyphens
+ * @param address The string to validate
+ * @returns boolean indicating if the string is a valid ENS name
+ */
+export const isENS = (address = ""): boolean => {
+  // Basic ENS validation
+  const ensRegex =
+    /^(?:[a-z0-9][a-z0-9-]{0,61}[a-z0-9]\.)*[a-z0-9][a-z0-9-]{0,61}[a-z0-9]\.eth$/i;
+
+  // Additional length validation
+  const withoutEth = address.replace(/\.eth$/i, "");
+  const isValidLength = withoutEth.length >= 3 && withoutEth.length <= 255;
+
+  return ensRegex.test(address) && isValidLength;
+};
+
+/**
+ * Validates if a string is either a valid Ethereum address or ENS name
+ * @param value The string to validate
+ * @returns boolean indicating if the string is a valid Ethereum address or ENS name
+ */
+export const isValidEthereumAddressOrENS = (value = ""): boolean => {
+  return isAddress(value) || isENS(value);
+};
+
+/**
+ * Checks if a string matches the format of an Ethereum address (0x followed by 40 hex characters)
+ * Note: This does not validate checksum. Use isAddress from viem for full validation
+ * @param value The string to validate
+ * @returns boolean indicating if the string matches Ethereum address format
+ */
+export const hasEthereumAddressFormat = (value = ""): boolean => {
+  return /^0x[a-fA-F0-9]{40}$/i.test(value);
+};
+
+/**
+ * Normalizes an Ethereum address or ENS name for consistent comparison
+ * @param value The address or ENS name to normalize
+ * @returns The normalized value (lowercase for ENS, unchanged for addresses)
+ */
+export const normalizeAddressOrENS = (value = ""): string => {
+  if (isENS(value)) {
+    return value.toLowerCase();
+  }
+  return value;
+};