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import { GetParameterCommand, SSM } from '@aws-sdk/client-ssm';
import * as dotenv from 'dotenv';
const ssm = new SSM({});
export async function run(mapPath: string, envFilePath: string) {
const paramMap = loadParamMap(mapPath);
const existingEnvVariables = loadExistingEnvVariables(envFilePath);
const updatedEnvVariables = await fetchAndUpdateEnvVariables(paramMap, existingEnvVariables);
writeEnvFile(envFilePath, updatedEnvVariables);
console.log(`Environment File generated at '${envFilePath}'`);
}
function loadParamMap(mapPath: string): Record<string, string> {
const content = fs.readFileSync(mapPath, 'utf-8');
try {
return JSON.parse(content);
} catch (error) {
console.error(`Error parsing JSON from ${mapPath}`);
throw new Error(`Invalid JSON in parameter map file: ${mapPath}`);
}
}
function loadExistingEnvVariables(envFilePath: string): Record<string, string> {
const envVariables: Record<string, string> = {};
if (!fs.existsSync(envFilePath)) return envVariables;
const existingEnvContent = fs.readFileSync(envFilePath, 'utf-8');
const parsedEnv = dotenv.parse(existingEnvContent);
Object.assign(envVariables, parsedEnv);
return envVariables;
}
async function fetchAndUpdateEnvVariables(
paramMap: Record<string, string>,
existingEnvVariables: Record<string, string>,
): Promise<Record<string, string>> {
const errors: string[] = [];
for (const [envVar, ssmName] of Object.entries(paramMap)) {
try {
const value = await fetchSSMParameter(ssmName);
if (value) {
existingEnvVariables[envVar] = value;
console.log(
`${envVar}=${value.length > 3 ? '*'.repeat(value.length - 3) + value.slice(-3) : '*'.repeat(value.length)}`,
);
} else {
console.error(`Warning: No value found for: '${ssmName}'`);
}
} catch (error) {
console.error(`Error fetching parameter: '${ssmName}'`);
errors.push(`ParameterNotFound: ${ssmName}`);
}
}
if (errors.length > 0) {
throw new Error(`Some parameters could not be fetched:\n${errors.join('\n')}`);
}
return existingEnvVariables;
}
async function fetchSSMParameter(ssmName: string): Promise<string | undefined> {
const command = new GetParameterCommand({
Name: ssmName,
WithDecryption: true,
});
const { Parameter } = await ssm.send(command);
return Parameter?.Value;
}
function writeEnvFile(envFilePath: string, envVariables: Record<string, string>): void {
const envContent = Object.entries(envVariables)
.map(([key, value]) => {
const escapedValue = value.replace(/(\n|\r|\n\r)/g, '\\n').replace(/"/g, '\\"');
return `${key}=${escapedValue}`;
})
.join('\n');
fs.writeFileSync(envFilePath, envContent);
}
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