feat: counterfactual address helper

src/sdk/account/toNexusAccount.ts

@@ -288,7 +288,7 @@ export const toNexusAccount = async (
         }
       ],
       functionName: "computeAccountAddress",
-      args: [signerAddress, index, [], 0]
+      args: [signerAddress, index, attesters_, attesterThreshold]
     })) as Address
 
     if (!addressEquals(addressFromFactory, zeroAddress)) {

src/sdk/account/utils/getCounterFactualAddress.ts

@@ -0,0 +1,80 @@
+import {
+  MOCK_ATTESTER_ADDRESS,
+  RHINESTONE_ATTESTER_ADDRESS
+} from "@rhinestone/module-sdk/module"
+import type { Address } from "viem"
+import type { PublicClient } from "viem"
+import { k1ValidatorFactoryAddress } from "../../constants"
+
+/**
+ * Get the counterfactual address of a signer
+ *
+ * @param publicClient - The public client to use for the read contract
+ * @param signerAddress - The address of the signer
+ * @param index - The index of the account
+ * @param isTestnet - Whether the network is testnet
+ * @param attesters - The attesters to use
+ * @param threshold - The threshold of the attesters
+ * @param factoryAddress - The factory address to use
+ * @returns The counterfactual address
+ *
+ * @example
+ * ```ts
+ *   const counterFactualAddress = await getCounterFactualAddress(publicClient, signerAddress)
+ * ```
+ */
+export const getCounterFactualAddress = async (
+  publicClient: PublicClient,
+  signerAddress: Address,
+  isTestnet = false,
+  index = 0n,
+  attesters = [RHINESTONE_ATTESTER_ADDRESS],
+  threshold = 1,
+  factoryAddress = k1ValidatorFactoryAddress
+) => {
+  if (isTestnet) {
+    attesters.push(MOCK_ATTESTER_ADDRESS)
+  }
+
+  return await publicClient.readContract({
+    address: factoryAddress,
+    abi: [
+      {
+        inputs: [
+          {
+            internalType: "address",
+            name: "eoaOwner",
+            type: "address"
+          },
+          {
+            internalType: "uint256",
+            name: "index",
+            type: "uint256"
+          },
+          {
+            internalType: "address[]",
+            name: "attesters",
+            type: "address[]"
+          },
+          {
+            internalType: "uint8",
+            name: "threshold",
+            type: "uint8"
+          }
+        ],
+        name: "computeAccountAddress",
+        outputs: [
+          {
+            internalType: "address payable",
+            name: "expectedAddress",
+            type: "address"
+          }
+        ],
+        stateMutability: "view",
+        type: "function"
+      }
+    ],
+    functionName: "computeAccountAddress",
+    args: [signerAddress, index, attesters, threshold]
+  })
+}

src/sdk/account/utils/index.ts

@@ -4,3 +4,4 @@ export * from "./Constants.js"
 export * from "./getChain.js"
 export * from "./Logger.js"
 export * from "./toSigner.js"
+export * from "./getCounterFactualAddress.js"