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/* eslint-disable import/no-extraneous-dependencies */
/* eslint-disable class-methods-use-this */
const AWS = require('aws-sdk');
const MAX_SSM_PARAMETERS_PER_REQUEST = 10;
class Secrets {
constructor(secretList) {
this.secretList = secretList;
Object.keys(secretList).forEach((secret) => {
this[secret] = secretList[secret];
});
}
flattenParameters(params) {
const flat = {};
params.forEach((param) => {
flat[param.Name.replace(/^.+\/(.+)$/, '$1')] = param.Value;
});
return flat;
}
init() {
if (this.initPromise === undefined) {
this.initPromise = new Promise((resolve, reject) => {
const shouldLoadSecretsFromSsm = !process.env.IS_OFFLINE || process.env.IS_TEST;
if (shouldLoadSecretsFromSsm) {
this.loadSecrets().then(resolve, reject);
} else {
resolve();
}
});
}
return this.initPromise;
}
loadSecrets() {
const ssm = new AWS.SSM();
const secretNames = Object.keys(this.secretList).map(secret => process.env[secret]);
// Create an array of promises of SSM getparameters requests.
// Max 10 per call.
const promises = [];
while (secretNames.length > 0) {
const subSet = secretNames.splice(0, MAX_SSM_PARAMETERS_PER_REQUEST);
promises.push(ssm.getParameters({ Names: subSet, WithDecryption: true }).promise());
}
return Promise.all(promises)
.then((secrets) => {
const settingsArray = [];
secrets.forEach((secretSet) => {
settingsArray.push(...secretSet.Parameters);
});
const settings = this.flattenParameters(settingsArray);
Object.keys(settings).forEach((setting) => {
this[setting] = settings[setting];
});
});
}
}
module.exports = Secrets;
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