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SecretsManagerClient,
GetSecretValueCommand,
type SecretsManagerClientConfig,
} from '@aws-sdk/client-secrets-manager'
import { SecretConfig, RetryConfig } from './types'
const DEFAULT_RETRY_CONFIG: RetryConfig = {
maxAttempts: 3,
delayMs: 1000,
}
/**
* Validate the configuration object.
*
* @param {SecretConfig} config - The configuration object containing the secret name and region.
* @returns {void}
*/
/**
* Validate the configuration object.
*
* @param {SecretConfig} config - The configuration object containing the secret name and region.
* @returns {void}
*/
/**
* Validate the configuration object.
*
* @param {SecretConfig} config - The configuration object containing the secret name and region.
* @returns {void}
*/
function validateConfig(config: SecretConfig): void {
if (!config.region) {
throw new Error('AWS region is required')
}
if (!config.secretName) {
throw new Error('Secret name is required')
}
}
/**
* Create a Secrets Manager client configuration.
*
* @param {SecretConfig} config - The configuration object containing the secret name and region.
* @returns {SecretsManagerClientConfig} A Secrets Manager client configuration.
*
* @example
* ```typescript
* const clientConfig = createClientConfig({
* secretName: 'dev/video-microservice/env',
* region: 'us-east-2',
* })
* // Output: { region: 'us-east-2', maxAttempts: 3 }
* ```
*/
function createClientConfig(config: SecretConfig): SecretsManagerClientConfig {
const clientConfig: SecretsManagerClientConfig = {
region: config.region,
maxAttempts: DEFAULT_RETRY_CONFIG.maxAttempts,
}
// Use IAM roles if available, otherwise use provided credentials
if (
process.env['AWS_ACCESS_KEY_ID'] &&
process.env['AWS_SECRET_ACCESS_KEY']
) {
// Use environment variables (IAM roles or default credentials)
console.log('Using AWS credentials from environment variables')
} else if (config.accessKeyId && config.secretAccessKey) {
// Use provided credentials
clientConfig.credentials = {
accessKeyId: config.accessKeyId,
secretAccessKey: config.secretAccessKey,
}
}
return clientConfig
}
/**
* Delay for a given number of milliseconds.
*
* @param {number} ms - The number of milliseconds to delay.
* @returns {Promise<void>} A promise that resolves after the delay.
*
* @example
* ```typescript
* await delay(1000)
* // Output: A promise that resolves after 1 second
* ```
*/
async function delay(ms: number): Promise<void> {
return new Promise((resolve) => setTimeout(resolve, ms))
}
/**
* Retry an operation with exponential backoff.
*
* @param {() => Promise<T>} operation - The operation to retry.
* @param {RetryConfig} [retryConfig] - The retry configuration for the operation.
* @returns {Promise<T>} A promise that resolves to the result of the operation.
*
* @example
* ```typescript
* const result = await retryWithBackoff(async () => {
* return await someOperation()
* })
* // Output: The result of the operation
* ```
*/
async function retryWithBackoff<T>(
operation: () => Promise<T>,
retryConfig: RetryConfig = DEFAULT_RETRY_CONFIG
): Promise<T> {
let lastError: Error
for (let attempt = 1; attempt <= retryConfig.maxAttempts; attempt++) {
try {
return await operation()
} catch (error) {
lastError = error instanceof Error ? error : new Error(String(error))
if (attempt === retryConfig.maxAttempts) {
throw lastError
}
// Exponential backoff
const delayTime = retryConfig.delayMs * Math.pow(2, attempt - 1)
console.warn(
`Attempt ${attempt} failed, retrying in ${delayTime}ms:`,
lastError.message
)
await delay(delayTime)
}
}
throw lastError!
}
/**
* Load secrets from AWS Secrets Manager.
*
* @param {SecretConfig} config - The configuration object containing the secret name and region.
* @param {RetryConfig} [retryConfig] - The retry configuration for the operation.
* @returns {Promise<Record<string, string>>} A promise that resolves to a record of secret names and their values.
*
* @example
* ```typescript
* const secrets = await loadSecrets({
* secretName: 'dev/video-microservice/env',
* region: 'us-east-2',
* })
* // Output: { NODE_ENV: 'development', DATABASE_URL: '...', API_KEY: '...', ... }
* ```
*/
export async function loadSecrets(
config: SecretConfig,
retryConfig?: RetryConfig
): Promise<Record<string, string>> {
validateConfig(config)
const clientConfig = createClientConfig(config)
const client = new SecretsManagerClient(clientConfig)
const secretNames = Array.isArray(config.secretName)
? config.secretName
: [config.secretName]
const allSecrets: Record<string, string> = {}
for (const secretName of secretNames) {
if (!secretName || typeof secretName !== 'string') {
console.warn('Invalid secret name provided, skipping')
continue
}
try {
const secrets = await retryWithBackoff(async () => {
const command = new GetSecretValueCommand({
SecretId: secretName,
})
const response = await client.send(command)
if (!response.SecretString) {
throw new Error(`Secret ${secretName} not found or empty`)
}
try {
return JSON.parse(response.SecretString)
} catch (parseError) {
throw new Error(
`Failed to parse secret ${secretName} as JSON: ${parseError instanceof Error ? parseError.message : 'Unknown error'}`
)
}
}, retryConfig)
Object.assign(allSecrets, secrets)
console.log(`Successfully loaded secret: ${secretName}`)
} catch (error) {
const errorMessage =
error instanceof Error ? error.message : 'Unknown error'
console.error(`Error loading secret ${secretName}: ${errorMessage}`)
// In production, you might want to throw the error
// For now, we'll continue with other secrets
if (process.env['NODE_ENV'] === 'production') {
throw error
}
}
}
// Set environment variables
Object.entries(allSecrets).forEach(([key, value]) => {
if (key && value !== undefined && value !== null) {
process.env[key] = String(value)
}
})
return allSecrets
}
/**
* Test function to display all saved secrets in the environment variables.
* This function logs all environment variables to the console for debugging purposes.
* Useful for verifying that secrets were properly loaded and set as environment variables.
*
* @example
* ```typescript
* testSavedSecrets()
* // Output: { NODE_ENV: 'development', DATABASE_URL: '...', API_KEY: '...', ... } 'SAVED SECRETS'
* ```
*/
export function testSavedSecrets(): void {
console.log(process.env, 'SAVED SECRETS')
}
/**
* Check if the current process is running on AWS (EC2, Lambda, etc.).
*
* @returns {boolean} True if running on AWS, false otherwise.
*
* @example
* ```typescript
* isRunningOnAWS()
* // Output: true
* ```
*/
export function isRunningOnAWS(): boolean {
return !!(
process.env['AWS_EXECUTION_ENV'] || process.env['AWS_LAMBDA_FUNCTION_NAME']
)
}
/**
* Get the AWS region from the environment variables.
*
* @returns {string | undefined} The AWS region.
*
* @example
* ```typescript
* getAWSRegion()
* // Output: 'us-east-1'
* ```
*/
export function getAWSRegion(): string | undefined {
return process.env['AWS_REGION'] || process.env['AWS_DEFAULT_REGION']
}
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