ssm-config-loader/lib/index.js

Load configuration from SSM Parameter Store with local fallback

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.loadSsmConfig = void 0;
const promises_1 = require("fs/promises");
const path = __importStar(require("path"));
const loadConfigFromSsm = async (ssm, prefix) => {
    const config = {};
    let nextToken = undefined;
    do {
        const result = await ssm.getParametersByPath({
            Path: prefix,
            Recursive: true,
            NextToken: nextToken,
            WithDecryption: true,
        });
        if (!result.Parameters) {
            break;
        }
        for (const parameter of result.Parameters) {
            if (parameter.Name === undefined || parameter.Value === undefined) {
                continue;
            }
            const branchNames = parameter.Name.substring(prefix.length + 1).split('/');
            const leafName = branchNames.pop();
            if (!leafName) {
                continue;
            }
            let branch = config;
            for (const branchName of branchNames) {
                if (typeof branch[branchName] === 'string') {
                    throw new Error(`Parameter "${parameter.Name}" collides with leaf node parameter`);
                }
                if (!branch[branchName]) {
                    branch[branchName] = {};
                }
                branch = branch[branchName];
            }
            branch[leafName] = parameter.Value;
        }
        nextToken = result.NextToken;
    } while (nextToken);
    return config;
};
const loadConfigFromFile = async () => {
    const json = await (0, promises_1.readFile)(path.join(process.cwd(), 'ssm-config.json'), { encoding: 'utf8' });
    return JSON.parse(json);
};
const loadSsmConfig = async (ssm, prefix) => {
    if (prefix) {
        return loadConfigFromSsm(ssm, prefix);
    }
    return loadConfigFromFile();
};
exports.loadSsmConfig = loadSsmConfig;
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