feat: BitcoinProxiedRpcProvider

example/index.ts

@@ -1,16 +1,27 @@
-import { BitcoinRpcProvider, UtuProvider } from "bitcoin-on-starknet";
+import { BitcoinProxiedRpcProvider, UtuProvider } from "bitcoin-on-starknet";
+import { Account, RpcProvider } from "starknet";
 
 async function main() {
-  // Initialize the Bitcoin RPC provider
-  const bitcoinProvider = new BitcoinRpcProvider({
-    url: process.env.BITCOIN_RPC_URL,
-    username: process.env.BITCOIN_RPC_USERNAME,
-    password: process.env.BITCOIN_RPC_PASSWORD,
-  });
+  // Initialize the Bitcoin RPC provider with a testing rpc graciously provided by LFG Labs
+  const bitcoinProvider = new BitcoinProxiedRpcProvider(
+    "https://btcrpc.lfg.rs/rpc"
+  );
   const utuProvider = new UtuProvider(bitcoinProvider);
 
+  // Initialize Starknet provider
+  const starknetProvider = new RpcProvider({
+    nodeUrl: "https://sepolia.rpc.starknet.id",
+  });
+
+  // Initialize a Starknet Account
+  const account = new Account(
+    starknetProvider,
+    process.env.STARKNET_ADDRESS as string,
+    process.env.STARKNET_PRIVATE_KEY as string
+  );
+
   try {
-    // Data that we are going to use
+    // This is our bitcoin deposit transaction
     const txId =
       "fa89c32152bf324cd1d47d48187f977c7e0f380f6f78132c187ce27923f62fcc";
     const rawTransaction = await bitcoinProvider.getRawTransaction(txId, true);

src/BitcoinProxiedRpcProvider.ts

@@ -0,0 +1,31 @@
+import { BitcoinRpcProvider } from "@/BitcoinRpcProvider";
+
+export class BitcoinProxiedRpcProvider extends BitcoinRpcProvider {
+  private proxyUrl: string;
+
+  constructor(proxyUrl: string) {
+    // Pass a dummy config to parent class
+    super({ url: "dummy" });
+    this.proxyUrl = proxyUrl;
+  }
+
+  protected override async callRpc(
+    method: string,
+    params: any[] = []
+  ): Promise<Response> {
+    const body = JSON.stringify({
+      jsonrpc: "1.0",
+      id: new Date().getTime(),
+      method: method,
+      params: params,
+    });
+
+    return fetch(this.proxyUrl, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: body,
+    });
+  }
+}

src/BitcoinRpcProvider.ts

@@ -19,7 +19,10 @@ export class BitcoinRpcProvider implements BitcoinProvider {
     };
   }
 
-  private async callRpc(method: string, params: any[] = []): Promise<Response> {
+  protected async callRpc(
+    method: string,
+    params: any[] = []
+  ): Promise<Response> {
     const body = JSON.stringify({
       jsonrpc: "1.0",
       id: new Date().getTime(),

src/UtuProvider.ts

@@ -1,7 +1,7 @@
 import { BitcoinProvider } from "./BitcoinProvider";
 import { BlockHeightProof, RegisterBlocksTx } from "@/UtuTypes";
 import { BlockHeader } from "./BitcoinTypes";
-import { BigNumberish, byteArray, ByteArray } from "starknet";
+import { BigNumberish, ByteArray } from "starknet";
 
 const CONTRACT_ADDRESS =
   "0x064e21f88caa162294fdda7f73d67ad09b81419e97df3409a5eb13ba39b88c31";

src/index.ts

@@ -1,4 +1,5 @@
 export * from "@/BitcoinProvider";
+export * from "@/BitcoinProxiedRpcProvider";
 export * from "@/BitcoinRpcProvider";
 export * from "@/UtuProvider";
 export * from "@/BitcoinTypes";