docs: using the aws secrets manager plugin (#254)

Co-authored-by: Sophia Chu <[email protected]>

docs/using-the-nodejs-wrapper/using-plugins/UsingTheAwsSecretsManagerPlugin.md

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+# AWS Secrets Manager Plugin
+
+The AWS Advanced NodeJS Wrapper supports usage of database credentials stored as secrets in the [AWS Secrets Manager](https://aws.amazon.com/secrets-manager/) through the AWS Secrets Manager Connection Plugin. When you create a new connection with this plugin enabled, the plugin will retrieve the secret and the connection will be created with the credentials inside that secret.
+
+## Prerequisites
+
+- This plugin requires the following packages to be installed:
+  - [@aws-sdk/client-secrets-manager](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/Package/-aws-sdk-client-secrets-manager/)
+
+## Enabling the AWS Secrets Manager Connection Plugin
+
+To enable the AWS Secrets Manager Connection Plugin, add the plugin code `secretsManager` to the [`plugins`](../UsingTheNodejsWrapper.md#connection-plugin-manager-parameters) connection parameter.
+
+This plugin requires a valid set of AWS credentials to retrieve the database credentials from AWS Secrets Manager. The AWS credentials must be located in [one of these locations](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/Package/-aws-sdk-credential-providers/#fromNodeProviderChain) supported by the AWS SDK's default credentials provider.
+
+## AWS Secrets Manager Connection Plugin Parameters
+
+The following properties are required for the AWS Secrets Manager Connection Plugin to retrieve database credentials from the AWS Secrets Manager.
+
+> [!NOTE]  
+> To use this plugin, you will need to set the following AWS Secrets Manager specific parameters.
+
+| Parameter        | Value  | Required | Description                                                                                                                                                                                                                       | Example                  | Default Value |
+| ---------------- | :----: | :------: | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :----------------------- | ------------- |
+| `secretId`       | String |   Yes    | Set this value to be the secret name or the secret ARN.                                                                                                                                                                           | `secretId`               | `null`        |
+| `secretRegion`   | String |    No    | Set this value to be the region your secret is in.                                                                                                                                                                                | `us-east-2`              | `us-east-1`   |
+| `secretEndpoint` | String |    No    | Set this value to be the endpoint override to retrieve your secret from. This parameter value should be in the form of a URL, with a valid protocol (ex. `https://`) and domain (ex. `localhost`). A port number is not required. | `https://localhost:1234` | `null`        |
+
+> [!NOTE]  
+> A Secret ARN has the following format: `arn:aws:secretsmanager:<Region>:<AccountId>:secret:SecretName-6RandomCharacters`
+
+## Secret Data
+
+The plugin assumes that the secret contains the following properties `username` and `password`.
+
+### Example
+
+Examples of making a connection using credentials fetched from the AWS Secrets Manager can be found at:
+[PostgreSQL example](../../../examples/aws_driver_example/aws_secrets_manager_postgresql_example.ts) and [MySQL example](../../../examples/aws_driver_example/aws_secrets_manager_mysql_example.ts)

examples/aws_driver_example/aws_secrets_manager_mysql_example.ts

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+/*
+  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ 
+  Licensed under the Apache License, Version 2.0 (the "License").
+  You may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+ 
+  http://www.apache.org/licenses/LICENSE-2.0
+ 
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import { AwsMySQLClient } from "../../mysql/lib";
+
+const mysqlHost = "db-identifier.XYZ.us-east-2.rds.amazonaws.com";
+const port = 3306;
+const secretId = "id";
+
+const client = new AwsMySQLClient({
+  // Enable the AWS Secrets Manager Connection Plugin and configure connection parameters.
+  host: mysqlHost,
+  port: port,
+  secretId: secretId,
+  plugins: "secretsManager"
+});
+
+// Attempt connection.
+try {
+  await client.connect();
+  const result = await client.query({ sql: "SELECT 1" });
+  console.log(result);
+} finally {
+  await client.end();
+}

examples/aws_driver_example/aws_secrets_manager_postgresql_example.ts

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+/*
+  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ 
+  Licensed under the Apache License, Version 2.0 (the "License").
+  You may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+ 
+  http://www.apache.org/licenses/LICENSE-2.0
+ 
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import { AwsPGClient } from "../../pg/lib";
+
+const postgresHost = "db-identifier.XYZ.us-east-2.rds.amazonaws.com";
+const database = "employees";
+const port = 5432;
+const secretId = "id";
+
+const client = new AwsPGClient({
+  // Enable the AWS Secrets Manager Connection Plugin and configure connection parameters.
+  host: postgresHost,
+  database: database,
+  port: port,
+  secretId: secretId,
+  plugins: "secretsManager"
+});
+
+// Attempt connection.
+try {
+  await client.connect();
+  const result = await client.query("select 1");
+  console.log(result);
+} finally {
+  await client.end();
+}