Dockerfile

@@ -11,4 +11,4 @@ RUN yarn && yarn build
 EXPOSE 3000
 
 # Run the app
-CMD ["yarn", "start-faucet"]
+CMD ["node", "dist/index.js"]

README.md

@@ -11,7 +11,7 @@
 * Run the faucet:
 
   ```bash
-  yarn start-faucet
+  yarn start
 
   # Expected output:
   # Config:
@@ -19,3 +19,14 @@
   # Faucet server running on port <port>
   # Using DB directory '/path/to/faucet/data/db'
   ```
+
+* Example request:
+
+  ```bash
+  curl -X POST http://localhost:3000/faucet \
+    -H "Content-Type: application/json" \
+    -d '{"address": "laconic1cndafgkspae7es7g2j52hmxxukwsy84v6h07w5"}'
+
+  # Expected output:
+  # {"success":true,"txHash":"40405D3CCA8122482C36083762561908E2595A4B765B7457C3995525991D18CE"}
+  ```

environments/local.toml

@@ -3,10 +3,11 @@
   chainId = "laconic_9000-1"
   denom = "photon"
   prefix = "laconic"
+  gasPrice = "0.01"
   faucetKey = ""
 
 [server]
   port = 3000
   transferAmount = 1000000
-  dailyLimit = 3000000
+  periodTransferLimit = 3000000
   dbDir = "db"

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "laconic-testnet-faucet",
+  "name": "laconic-faucet",
   "version": "0.1.0",
   "main": "dist/index.js",
   "license": "UNLICENSED",
@@ -20,6 +20,7 @@
     "typescript": "^5.5.3"
   },
   "dependencies": {
+    "@cosmjs/encoding": "^0.32.4",
     "@cosmjs/proto-signing": "^0.32.4",
     "@cosmjs/stargate": "^0.32.4",
     "@keyv/sqlite": "^3.6.7",
@@ -30,6 +31,6 @@
   "scripts": {
     "lint": "eslint .",
     "build": "yarn tsc",
-    "start-faucet": "node dist/index.js"
+    "start": "node dist/index.js"
   }
 }

src/index.ts

@@ -7,10 +7,12 @@ import cors from 'cors';
 
 import { DirectSecp256k1Wallet } from '@cosmjs/proto-signing';
 import { GasPrice, SigningStargateClient } from '@cosmjs/stargate';
+import { fromBech32 } from '@cosmjs/encoding';
 import KeyvSqlite from '@keyv/sqlite';
 
 const CONFIG_PATH = 'environments/local.toml';
 const FAUCET_DATA_FILE = 'faucet_data.sqlite';
+const FAUCET_DATA_TTL = 86400000; // 24 hrs
 
 interface Config {
   upstream: {
@@ -18,12 +20,13 @@ interface Config {
     chainId: string
     denom: string
     prefix: string
+    gasPrice: string
     faucetKey: string
   },
   server: {
     port: number
     transferAmount: string
-    dailyLimit: string
+    periodTransferLimit: string
     dbDir: string
   }
 }
@@ -34,35 +37,39 @@ async function main (): Promise<void> {
   const config: Config = toml.parse(configFile);
   console.log('Config: ', JSON.stringify(config, null, 2));
 
-  const keyv = await initKVStore(config.server.dbDir);
+  const faucetDataStore = await initKVStore(config.server.dbDir);
 
   const app = express();
   app.use(express.json());
   app.use(cors());
 
   app.post('/faucet', async (req, res) => {
-    const { address } = req.body;
+    const { address: accountAddress } = req.body;
 
-    if (!address) {
-      return res.status(400).json({ error: 'Address is required' });
+    if (!accountAddress) {
+      return res.status(400).json({ error: 'address is required' });
+    }
+
+    if (!isValidAddress(accountAddress, config.upstream.prefix)) {
+      return res.status(400).json({ error: 'invalid address' });
     }
 
     // Check rate limit
     const now = Date.now();
     const today = new Date(now).toISOString().split('T')[0];
-    const key = `${address}:${today}`;
-    const currentAmount = await keyv.get(key) || '0';
+    const faucetStoreKey = `${accountAddress}:${today}`;
+    const amountSentToAddress = await faucetDataStore.get(faucetStoreKey) || '0';
 
-    if (BigInt(currentAmount) + BigInt(config.server.transferAmount) > BigInt(config.server.dailyLimit)) {
+    if (BigInt(amountSentToAddress) + BigInt(config.server.transferAmount) > BigInt(config.server.periodTransferLimit)) {
       return res.status(429).json({ error: 'Limit exceeded' });
     }
 
     try {
-      const txHash = await sendTokens(config, address, String(config.server.transferAmount));
-      console.log(`Sent tokens to address: ${address}, txHash: ${txHash}`);
+      const txHash = await sendTokens(config, accountAddress, String(config.server.transferAmount));
+      console.log(`Sent tokens to address: ${accountAddress}, txHash: ${txHash}`);
 
       // Update rate limit
-      await keyv.set(key, (BigInt(currentAmount) + BigInt(config.server.transferAmount)).toString(), 86400000); // 24 hours TTL
+      await faucetDataStore.set(faucetStoreKey, (BigInt(amountSentToAddress) + BigInt(config.server.transferAmount)).toString(), FAUCET_DATA_TTL);
 
       res.json({ success: true, txHash });
     } catch (error) {
@@ -112,7 +119,11 @@ async function sendTokens (config: Config, recipientAddress: string, amount: str
   );
   const [faucetAccount] = await wallet.getAccounts();
 
-  const client = await SigningStargateClient.connectWithSigner(config.upstream.rpcEndpoint, wallet, { gasPrice: GasPrice.fromString(`0.01${config.upstream.denom}`) });
+  const client = await SigningStargateClient.connectWithSigner(
+    config.upstream.rpcEndpoint,
+    wallet,
+    { gasPrice: GasPrice.fromString(`${config.upstream.gasPrice}${config.upstream.denom}`) }
+  );
 
   const result = await client.sendTokens(
     faucetAccount.address,
@@ -125,6 +136,19 @@ async function sendTokens (config: Config, recipientAddress: string, amount: str
   return result.transactionHash;
 }
 
+export function isValidAddress (address: string, requiredPrefix: string): boolean {
+  try {
+    const { prefix, data } = fromBech32(address);
+    if (prefix !== requiredPrefix) {
+      return false;
+    }
+
+    return data.length === 20;
+  } catch {
+    return false;
+  }
+}
+
 main().catch(err => {
   console.log(err);
 });