refactor: remove chain-id input and detect it from RPC URL in workflow

Author: Le-Caignec

.github/workflows/safe-transaction.yml

@@ -6,11 +6,6 @@ on:
         description: 'RPC URL for the blockchain network'
         required: true
         type: string
-      chain-id:
-        description: 'Chain ID of the blockchain network (default: 42161 for Arbitrum)'
-        required: false
-        default: '42161'
-        type: string
       safe-address:
         description: 'Address of the Safe contract'
         required: true
@@ -81,7 +76,6 @@ jobs:
           INPUT_RPC_URL: ${{ inputs.rpc-url }}
           INPUT_SAFE_ADDRESS: ${{ inputs.safe-address }}
           INPUT_TRANSACTION_TO: ${{ inputs.transaction-to }}
-          INPUT_CHAIN_ID: ${{ inputs.chain-id }}
           INPUT_TRANSACTION_VALUE: ${{ inputs.transaction-value }}
           INPUT_TRANSACTION_DATA: ${{ inputs.transaction-data }}
         id: safe-transaction

safe-transaction/README.md

@@ -4,13 +4,14 @@
 
 This reusable GitHub Actions workflow automates the process of proposing transactions to a Safe multi-signature wallet (Gnosis Safe). It handles the proposal submission, making it easy to integrate Safe transactions into your CI/CD pipeline.
 
+**🤖 Smart Chain Detection**: The workflow automatically detects the blockchain network's Chain ID from the provided RPC URL, eliminating the need to manually specify it.
+
 ## Workflow Inputs 🛠️
 
 | **Input**                | **Description**                                               | **Required** | **Default**                         |
 | ------------------------ | ------------------------------------------------------------- | ------------ | ----------------------------------- |
 | **proposer-private-key** | Private key of the proposer wallet                           | Yes          | -                                   |
 | **rpc-url**              | RPC URL for the blockchain network                            | Yes          | -                                   |
-| **chain-id**             | Chain ID of the blockchain network                            | No           | `42161` (Arbitrum)                  |
 | **safe-address**         | Address of the Safe contract                                  | Yes          | -                                   |
 | **transaction-to**       | Target address for the transaction                            | Yes          | -                                   |
 | **safe-api-key**         | Safe API key for transaction service                          | Yes          | -                                   |
@@ -47,10 +48,6 @@ This reusable GitHub Actions workflow automates the process of proposing transac
          transaction-to:
            description: 'Target contract address'
            required: true
-         chain-id:
-           description: 'Chain ID (e.g., 1 for Ethereum, 42161 for Arbitrum)'
-           required: false
-           default: '42161'
          transaction-data:
            description: 'Transaction data (0x prefixed)'
            required: false
@@ -66,7 +63,6 @@ This reusable GitHub Actions workflow automates the process of proposing transac
        with:
          safe-address: ${{ inputs.safe-address }}
          transaction-to: ${{ inputs.transaction-to }}
-         chain-id: ${{ inputs.chain-id }}
          transaction-data: ${{ inputs.transaction-data }}
    ```
 

safe-transaction/src/index.ts

@@ -2,14 +2,13 @@ import * as core from '@actions/core';
 import SafeApiKit from "@safe-global/api-kit";
 import Safe from "@safe-global/protocol-kit";
 import { OperationType, MetaTransactionData } from "@safe-global/types-kit";
-import { Wallet } from "ethers";
+import { Wallet, JsonRpcProvider } from "ethers";
 
 async function run() {
   try {
     // Get inputs from environment variables
     const proposerPrivateKey = process.env.INPUT_PROPOSER_PRIVATE_KEY;
     const rpcUrl = process.env.INPUT_RPC_URL;
-    const chainId = process.env.INPUT_CHAIN_ID || "42161"; // Default to Arbitrum
     const safeAddress = process.env.INPUT_SAFE_ADDRESS;
     const transactionTo = process.env.INPUT_TRANSACTION_TO;
     const safeApiKey = process.env.INPUT_SAFE_API_KEY;
@@ -28,14 +27,20 @@ async function run() {
     }
 
     core.info(`🚀 Starting Safe transaction proposal...`);
-    core.info(`🌐 Chain ID: ${chainId}`);
     core.info(`📍 Safe Address: ${safeAddress}`);
     core.info(`🎯 Target Address: ${transactionTo}`);
 
     // Initialize wallet
     const wallet = new Wallet(proposerPrivateKey);
     core.info(`🔑 Proposer Address: ${wallet.address}`);
 
+    // Detect chainId from RPC
+    core.info(`🔍 Detecting chain ID from RPC...`);
+    const provider = new JsonRpcProvider(rpcUrl);
+    const network = await provider.getNetwork();
+    const chainId = network.chainId.toString();
+    core.info(`🌐 Detected Chain ID: ${chainId}`);
+
     // Initialize API Kit
     const apiKit = new SafeApiKit({
       chainId: BigInt(chainId),