Add encode call data

helpers/encodeCallData.js

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+const Web3 = require('web3');
+
+/**
+ * Encodes call data for the deposit function with simplified argument handling.
+ * Automatically attempts to detect and encode integers and strings.
+ *
+ * @param {string} endpointName - The name of the endpoint for the cross-chain call.
+ * @param {number} gasLimit - The gas limit for the cross-chain call.
+ * @param {any[]} args - The arguments for the cross-chain call, assumed to be strings or numbers.
+ * @returns {string} The encoded callData string.
+ */
+function encodeCallData(endpointName, gasLimit, args) {
+    const web3 = new Web3();
+
+    // Convert endpoint name to bytes and prepend its length
+    const endpointNameBytes = web3.utils.asciiToHex(endpointName);
+    const endpointNameLength = web3.utils.leftPad(web3.utils.numberToHex(endpointNameBytes.length / 2), 8); // 4 bytes length
+
+    // Convert gasLimit to 8 bytes hex string
+    const gasLimitHex = web3.utils.leftPad(web3.utils.numberToHex(gasLimit), 16);
+
+    // Encode arguments, automatically handling as strings or numbers
+    let encodedArgs = '';
+    args.forEach(arg => {
+        let argHex;
+        if (typeof arg === 'number' || (!isNaN(arg) && !isNaN(parseFloat(arg)))) {
+            // Treat as number
+            argHex = web3.utils.numberToHex(arg);
+        } else {
+            // Default to treating as string
+            argHex = web3.utils.asciiToHex(arg);
+        }
+        const argLength = web3.utils.leftPad(web3.utils.numberToHex(argHex.length / 2), 8); // 4 bytes length
+        encodedArgs += argLength.substr(2) + argHex.substr(2); // Remove '0x' prefix
+    });
+
+    // Number of arguments in 4 bytes hex string
+    const numArgsHex = web3.utils.leftPad(web3.utils.numberToHex(args.length), 8);
+
+    // Combine everything
+    const callData = '01' + // Custom prefix
+        endpointNameLength.substr(2) + // Remove '0x' prefix
+        endpointNameBytes.substr(2) +
+        gasLimitHex.substr(2) +
+        numArgsHex.substr(2) +
+        encodedArgs;
+
+    return '0x' + callData;
+}
+
+
+module.exports = encodeCallData;

helpers/index.js

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+const encodeCallData = require('./encodeCallData');
+
+module.exports = {
+    encodeCallData,
+};

index.js

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+const { encodeCallData } = require('./helpers');
+
+module.exports = {
+    encodeCallData,
+};