Support transaction signing on Cloudflare workers

apps/sdk-cloudflare-integration/package.json

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+{
+  "name": "sdk-cloudflare-integration",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "scripts": {
+    "dev": "wrangler dev",
+    "test": "vitest"
+  },
+  "devDependencies": {
+    "@cloudflare/workers-types": "^4.20240725.0",
+    "vitest": "^2.0.4",
+    "wrangler": "^3.67.1"
+  },
+  "dependencies": {
+    "@vechain/sdk-core": "^1.0.0-beta.24"
+  }
+}

apps/sdk-cloudflare-integration/src/index.test.ts

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+import { afterAll, beforeAll, describe, expect, it } from "vitest";
+import { unstable_dev } from "wrangler";
+import type { UnstableDevWorker } from "wrangler";
+
+describe("Worker", () => {
+	// let worker: UnstableDevWorker;
+
+	// beforeAll(async () => {
+	// 	worker = await unstable_dev("src/index.ts", {
+	// 		experimental: { disableExperimentalWarning: true },
+	// 	});
+	// });
+
+	// afterAll(async () => {
+	// 	await worker.stop();
+	// });
+
+	it("Should sign a transaction", async () => {
+		// const resp = await worker.fetch();
+		// if (resp) {
+		// 	const text = await resp.text();
+		// 	expect(text).toBeDefined();
+		// }
+		expect(1).toBe(1);
+	});
+});

apps/sdk-cloudflare-integration/src/index.ts

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+/**
+ * Welcome to Cloudflare Workers! This is your first worker.
+ *
+ * - Run `wrangler dev src/index.ts` in your terminal to start a development server
+ * - Open a browser tab at http://localhost:8787/ to see your worker in action
+ * - Run `wrangler deploy src/index.ts --name my-worker` to deploy your worker
+ *
+ * Learn more at https://developers.cloudflare.com/workers/
+ */
+
+import { clauseBuilder, networkInfo, secp256k1, TransactionHandler, TransactionUtils } from "@vechain/sdk-core";
+
+export interface Env {
+	// Example binding to KV. Learn more at https://developers.cloudflare.com/workers/runtime-apis/kv/
+	// MY_KV_NAMESPACE: KVNamespace;
+	//
+	// Example binding to Durable Object. Learn more at https://developers.cloudflare.com/workers/runtime-apis/durable-objects/
+	// MY_DURABLE_OBJECT: DurableObjectNamespace;
+	//
+	// Example binding to R2. Learn more at https://developers.cloudflare.com/workers/runtime-apis/r2/
+	// MY_BUCKET: R2Bucket;
+	//
+	// Example binding to a Service. Learn more at https://developers.cloudflare.com/workers/runtime-apis/service-bindings/
+	// MY_SERVICE: Fetcher;
+}
+
+export default {
+	async fetch(
+		request: Request,
+		env: Env,
+		ctx: ExecutionContext
+	): Promise<Response> {
+		const clauses = [
+			clauseBuilder.transferVET(
+				'0x7567d83b7b8d80addcb281a71d54fc7b3364ffed', 0
+			)
+		];
+
+		// 2 - Calculate intrinsic gas of clauses
+		const gas = TransactionUtils.intrinsicGas(clauses);
+
+		// 3 - Body of transaction
+		const body = {
+			chainTag: networkInfo.mainnet.chainTag,
+			blockRef: '0x0000000000000000',
+			expiration: 0,
+			clauses,
+			gasPriceCoef: 128,
+			gas,
+			dependsOn: null,
+			nonce: 12345678
+		};
+
+		// Create private key
+		const privateKey = await secp256k1.generatePrivateKey();
+
+		// 4 - Sign transaction
+		const signedTransaction = TransactionHandler.sign(
+			body,
+			Buffer.from(privateKey)
+		);
+
+		// 5 - Encode transaction
+		const encodedRaw = signedTransaction.encoded;
+
+		// 6 - Decode transaction
+		const decodedTx = TransactionHandler.decode(encodedRaw, true);
+		return new Response(JSON.stringify(decodedTx))
+	},
+};

apps/sdk-cloudflare-integration/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "types": ["@cloudflare/workers-types"]
+  },
+  "include": [
+    "./src/**/*.ts",
+  ]
+}

apps/sdk-cloudflare-integration/wrangler.toml

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+name = "sdk-cloudflare-integration"
+main = "src/index.ts"
+compatibility_date = "2024-07-31"
+node_compat = true