chore: add withdrawal example

Refs cardano-foundation#202

examples/withdrawal-example.ts

@@ -0,0 +1,102 @@
+/* eslint-disable no-magic-numbers */
+/* eslint-disable camelcase */
+/* eslint-disable new-cap */
+/* eslint-disable no-console */
+import {
+  constructionDerive,
+  constructionPreprocess,
+  constructionMetadata,
+  constructionPayloads,
+  constructionCombine,
+  constructionSubmit,
+  signPayloads,
+  waitForBalanceToBe,
+  buildOperation,
+  generateKeys,
+} from "./commons";
+const logger = console;
+
+const PRIVATE_KEY =
+  "41d9523b87b9bd89a4d07c9b957ae68a7472d8145d7956a692df1a8ad91957a2c117d9dd874447f47306f50a650f1e08bf4bec2cfcb2af91660f23f2db912977";
+const SEND_FUNDS_ADDRESS =
+  "addr1qqr585tvlc7ylnqvz8pyqwauzrdu0mxag3m7q56grgmgu7sxu2hyfhlkwuxupa9d5085eunq2qywy7hvmvej456flknsug829n";
+const PRIVATE_STAKING_KEY =
+  "nqDmxvW0ytblMFnEbMFO8rVgl5V/pYnso/TPOyWz3vylms3kaRPDAg49S/rYyJh+eb+e0X3jeqCBhXgAHNjLCA==";
+const WITHDRAWAL_AMOUNT = 10000;
+
+const network_identifier = {
+  blockchain: "cardano",
+  network: "testnet",
+};
+
+const buildWithdrawalOperation = (
+  stakingKey: string,
+  currentIndex: number,
+  withdrawalAmount: number
+) => ({
+  operation_identifier: {
+    index: currentIndex + 1,
+  },
+  type: "withdrawal",
+  status: "success",
+  amount: {
+    value: withdrawalAmount,
+    currency: {
+      symbol: "ADA",
+      decimals: 6,
+    },
+  },
+  metadata: {
+    staking_credential: {
+      hex_bytes: stakingKey,
+      curve_type: "edwards25519",
+    },
+  },
+});
+
+const doRun = async (): Promise<void> => {
+  const keys = generateKeys(PRIVATE_KEY);
+  logger.info(
+    `[doRun] secretKey ${Buffer.from(keys.secretKey).toString("hex")}`
+  );
+  const publicKey = Buffer.from(keys.publicKey).toString("hex");
+
+  const stakingKey = Buffer.from(
+    generateKeys(PRIVATE_STAKING_KEY).publicKey
+  ).toString("hex");
+  logger.info(`[doRun] secretKey ${stakingKey}`);
+  const address = await constructionDerive(publicKey);
+  const unspents = await waitForBalanceToBe(
+    address,
+    (response) => response.coins.length !== 0
+  );
+  const builtOperations = buildOperation(unspents, address, SEND_FUNDS_ADDRESS);
+  const totalOperations = builtOperations.operations.length;
+  const builtDelegationOperation = buildWithdrawalOperation(
+    stakingKey,
+    totalOperations,
+    WITHDRAWAL_AMOUNT
+  );
+  builtOperations.operations.push(builtDelegationOperation);
+  const preprocess = await constructionPreprocess(builtOperations, 1000);
+  const metadata = await constructionMetadata(preprocess);
+  const payloads = await constructionPayloads({
+    network_identifier,
+    operations: builtOperations.operations,
+    metadata,
+  });
+  const signatures = signPayloads(payloads.payloads, keys);
+  const combined = await constructionCombine(
+    payloads.unsigned_transaction,
+    signatures
+  );
+  logger.info(`[doRun] signed transaction is ${combined.signed_transaction}`);
+  const hashResponse = await constructionSubmit(combined.signed_transaction);
+  logger.info(
+    `[doRun] transaction with hash ${hashResponse.transaction_identifier.hash} sent`
+  );
+};
+
+doRun()
+  .then(() => logger.info("Stake Registration finished"))
+  .catch(console.error);