Add another option to provide auth details (#25)

## Description Of Change

Add an option to initialize client with the api key name and private key
instead of completely relying on api-key file.

This PR will enable these 2 styles of interacting with the API and make
option 1 as the default in our examples and README.

Option 1: Requires client initialize to pass the details such as API key
name and private key.

```
const apiKeyName: string = 'your-api-key-name';
const apiPrivateKey: string = 'your-api-private-key';

const client = new StakingClient(apiKeyName, apiPrivateKey);

client.Ethereum.stake(network, stakerAddress, amount);
```

Option 2: Need a api key of name `.coinbase_cloud_api_key.json` present
in the root dir.

```
const client = new StakingClient();

client.Ethereum.stake(network, stakerAddress, amount);
```

## Testing Procedure

Manually ran through the README to execute and make sure all is good.

README.md

@@ -22,14 +22,17 @@ Prerequisite: [Node 20+](https://www.npmjs.com/package/node/v/20.11.1)
    ```shell
    npm install @coinbase/staking-client-library-ts
    ```
-2. Create and download an API key from the [Coinbase Developer Platform](https://portal.cdp.coinbase.com/access/api).
-3. Place the key named `.coinbase_cloud_api_key.json` at the root of this repository.
-4. Install necessary Typescript dependencies:
+
+2. Install necessary Typescript dependencies:
    ```shell
-    npm install -g ts-node
-    npm install -g typescript
-    ```
-5. Copy and paste one of the code samples below or any of our [provided examples](./examples/) into an `example.ts` file and run it with `ts-node` :rocket:
+   npm install -g ts-node typescript
+   ```
+
+3. Get your API keys info such as api key name and api private key from here: https://portal.cdp.coinbase.com/access/api. <br>
+   These will be used in order to set up our client later in the example code. <br>
+   For detailed instructions refer to our api key setup guide [here](https://docs.cdp.coinbase.com/developer-platform/docs/cdp-keys).
+
+4. Copy and paste one of the code samples below or any of our [provided examples](./examples/) into an `example.ts` file and run it with `ts-node` :rocket:
    ```shell
    ts-node example.ts
    ```
@@ -45,7 +48,11 @@ This code sample creates an ETH staking workflow. View the full code sample [her
 // examples/ethereum/create-workflow.ts
 import { StakingClient } from "@coinbase/staking-client-library-ts";
 
-const client = new StakingClient();
+// Set your api key name and private key here. Get your keys from here: https://portal.cdp.coinbase.com/access/api
+const apiKeyName: string = 'your-api-key-name';
+const apiPrivateKey: string = 'your-api-private-key';
+
+const client = new StakingClient(apiKeyName, apiPrivateKey);
 
 client.Ethereum.stake('holesky', '0xdb816889F2a7362EF242E5a717dfD5B38Ae849FE', '123')
   .then((workflow) => {
@@ -108,7 +115,11 @@ This code sample creates a SOL staking workflow. View the full code sample [here
 // examples/solana/create-workflow.ts
 import { StakingClient } from "@coinbase/staking-client-library-ts";
 
-const client = new StakingClient();
+// Set your api key name and private key here. Get your keys from here: https://portal.cdp.coinbase.com/access/api
+const apiKeyName: string = 'your-api-key-name';
+const apiPrivateKey: string = 'your-api-private-key';
+
+const client = new StakingClient(apiKeyName, apiPrivateKey);
 
 client.Solana.stake('devnet', '8rMGARtkJY5QygP1mgvBFLsE9JrvXByARJiyNfcSE5Z', '100000000')
   .then((workflow) => {
@@ -175,13 +186,17 @@ This code sample returns rewards for an Ethereum validator address. View the ful
 // examples/ethereum/list-rewards.ts
 import { StakingClient } from "@coinbase/staking-client-library-ts";
 
+// Set your api key name and private key here. Get your keys from here: https://portal.cdp.coinbase.com/access/api
+const apiKeyName: string = 'your-api-key-name';
+const apiPrivateKey: string = 'your-api-private-key';
+
+const client = new StakingClient(apiKeyName, apiPrivateKey);
+
 // Defines which address and rewards we want to see
 const address: string =
   '0xac53512c39d0081ca4437c285305eb423f474e6153693c12fbba4a3df78bcaa3422b31d800c5bea71c1b017168a60474';
 const filter: string = `address='${address}' AND period_end_time > '2024-02-25T00:00:00Z' AND period_end_time < '2024-02-27T00:00:00Z'`;
 
-const client = new StakingClient();
-
 // Loops through rewards array and prints each reward
 client.Ethereum.listRewards(filter).then((resp) => {
   resp.rewards!.forEach((reward) => {

examples/ethereum/create-and-process-workflow.ts

@@ -9,19 +9,23 @@ import {
 import { Workflow } from '../../src/gen/coinbase/staking/orchestration/v1/workflow.pb';
 import { calculateTimeDifference } from '../../src/utils/date';
 
-const privateKey: string = ''; // replace with your private key
+const walletPrivateKey: string = 'your-wallet-private-key'; // replace with your wallet's private key
 const stakerAddress: string = '0xdb816889F2a7362EF242E5a717dfD5B38Ae849FE'; // replace with your staker address
 const amount: string = '123'; // replace with your amount
 const network: string = 'holesky'; // replace with your network
 
-const client = new StakingClient();
+// Set your api key name and private key here. Get your keys from here: https://portal.cdp.coinbase.com/access/api
+const apiKeyName: string = 'your-api-key-name';
+const apiPrivateKey: string = 'your-api-private-key';
+
+const client = new StakingClient(apiKeyName, apiPrivateKey);
 
 const signer = TxSignerFactory.getSigner('ethereum');
 
 async function stakePartialEth(): Promise<void> {
-  if (privateKey === '' || stakerAddress === '') {
+  if (walletPrivateKey === '' || stakerAddress === '') {
     throw new Error(
-      'Please set the privateKey and stakerAddress variables in this file',
+      'Please set the walletPrivateKey and stakerAddress variables in this file',
     );
   }
 
@@ -80,7 +84,10 @@ async function stakePartialEth(): Promise<void> {
       }
 
       console.log('Signing unsigned tx %s ...', unsignedTx);
-      const signedTx = await signer.signTransaction(privateKey, unsignedTx);
+      const signedTx = await signer.signTransaction(
+        walletPrivateKey,
+        unsignedTx,
+      );
 
       console.log(
         'Please broadcast this signed tx %s externally and return back the tx hash via the PerformWorkflowStep API ...',

examples/ethereum/create-workflow.ts

@@ -5,7 +5,11 @@ const stakerAddress: string = '0xdb816889F2a7362EF242E5a717dfD5B38Ae849FE'; // r
 const amount: string = '123'; // replace with your amount
 const network: string = 'holesky'; // replace with your network
 
-const client = new StakingClient();
+// Set your api key name and private key here. Get your keys from here: https://portal.cdp.coinbase.com/access/api
+const apiKeyName: string = 'your-api-key-name';
+const apiPrivateKey: string = 'your-api-private-key';
+
+const client = new StakingClient(apiKeyName, apiPrivateKey);
 
 async function stakePartialEth(): Promise<void> {
   if (stakerAddress === '') {

examples/solana/create-and-process-workflow.ts

@@ -9,19 +9,23 @@ import {
 import { Workflow } from '../../src/gen/coinbase/staking/orchestration/v1/workflow.pb';
 import { calculateTimeDifference } from '../../src/utils/date';
 
-const privateKey: string = ''; // replace with your private key
+const walletPrivateKey: string = 'your-wallet-private-key'; // replace with your wallet's private key
 const walletAddress: string = ''; // replace with your wallet address
 const amount: string = '100000000'; // replace with your amount. For solana it should be >= 0.1 SOL
 const network: string = 'mainnet'; // replace with your network
 
-const client = new StakingClient();
+// Set your api key name and private key here. Get your keys from here: https://portal.cdp.coinbase.com/access/api
+const apiKeyName: string = 'your-api-key-name';
+const apiPrivateKey: string = 'your-api-private-key';
+
+const client = new StakingClient(apiKeyName, apiPrivateKey);
 
 const signer = TxSignerFactory.getSigner('solana');
 
 async function stakeSolana(): Promise<void> {
-  if (privateKey === '' || walletAddress === '') {
+  if (walletPrivateKey === '' || walletAddress === '') {
     throw new Error(
-      'Please set the privateKey and walletAddress variables in this file',
+      'Please set the walletPrivateKey and walletAddress variables in this file',
     );
   }
 
@@ -83,7 +87,10 @@ async function stakeSolana(): Promise<void> {
       }
 
       console.log('Signing unsigned tx %s ...', unsignedTx);
-      const signedTx = await signer.signTransaction(privateKey, unsignedTx);
+      const signedTx = await signer.signTransaction(
+        walletPrivateKey,
+        unsignedTx,
+      );
 
       console.log(
         'Please broadcast this signed tx %s externally and return back the tx hash via the PerformWorkflowStep API ...',

examples/solana/create-workflow.ts

@@ -5,7 +5,11 @@ const walletAddress: string = '9NL2SkpcsdyZwsG8NmHGNra4i4NSyKbJTVd9fUQ7kJHR'; //
 const amount: string = '100000000'; // replace with your amount. For solana it should be >= 0.1 SOL
 const network: string = 'mainnet'; // replace with your network
 
-const client = new StakingClient();
+// Set your api key name and private key here. Get your keys from here: https://portal.cdp.coinbase.com/access/api
+const apiKeyName: string = 'your-api-key-name';
+const apiPrivateKey: string = 'your-api-private-key';
+
+const client = new StakingClient(apiKeyName, apiPrivateKey);
 
 async function stakeSolana(): Promise<void> {
   if (walletAddress === '') {

src/auth/index.ts

@@ -8,20 +8,35 @@ const pemFooter = '-----END EC PRIVATE KEY-----';
 
 /**
  * Build a JWT for the specified service and URI.
- * @param service The name of the service.
- * @param uri The URI for which the JWT is to be generated.
  * @returns The generated JWT.
+ * @param url The URL for which the JWT is to be generated.
+ * @param method The HTTP method for the request.
+ * @param apiKeyName The name of the API key.
+ * @param apiPrivateKey The private key present in the API key downloaded from platform.
  */
 export const buildJWT = async (
   url: string,
   method = 'GET',
+  apiKeyName?: string,
+  apiPrivateKey?: string,
 ): Promise<string> => {
-  const keyFile = readFileSync('.coinbase_cloud_api_key.json', {
-    encoding: 'utf8',
-  });
-  const apiKey: APIKey = JSON.parse(keyFile);
+  let pemPrivateKey: string;
+  let keyName: string;
+  let apiKey: APIKey;
+
+  if (apiKeyName && apiPrivateKey) {
+    pemPrivateKey = extractPemKey(apiPrivateKey);
+    keyName = apiKeyName;
+  } else {
+    const keyFile = readFileSync('.coinbase_cloud_api_key.json', {
+      encoding: 'utf8',
+    });
+
+    apiKey = JSON.parse(keyFile);
+    pemPrivateKey = extractPemKey(apiKey.privateKey);
+    keyName = apiKey.name;
+  }
 
-  const pemPrivateKey = extractPemKey(apiKey.privateKey);
   let privateKey: JWK.Key;
 
   try {
@@ -35,7 +50,7 @@ export const buildJWT = async (
 
   const header = {
     alg: 'ES256',
-    kid: apiKey.name,
+    kid: keyName,
     typ: 'JWT',
     nonce: nonce(),
   };
@@ -44,7 +59,7 @@ export const buildJWT = async (
   const uri = `${method} ${url.substring(8)}`;
 
   const claims: APIKeyClaims = {
-    sub: apiKey.name,
+    sub: keyName,
     iss: 'coinbase-cloud',
     nbf: Math.floor(Date.now() / 1000),
     exp: Math.floor(Date.now() / 1000) + 60, // +1 minute
@@ -103,7 +118,7 @@ interface APIKeyClaims {
  */
 const extractPemKey = (privateKeyString: string): string => {
   // Remove all newline characters
-  privateKeyString = privateKeyString.replace(/\n/g, '');
+  privateKeyString = privateKeyString.replace(/\\n|\n/g, '');
 
   // If the string starts with the standard PEM header and footer, return as is.
   if (