@sap/ams-dev/src/client/util.js

NodesJS AMS development environment

const https = require("node:https");
const fs = require('node:fs');
const stream = require("node:stream");
const { createHash } = require("node:crypto");

const AMS_INSTANCE_HEADER = "X-Ams-Instance-Id";
const version = require("../../package.json").version;
const USER_AGENT = `@sap/ams-dev:${version}`;

function addDefaultHeaders(headers, credentials) {
    headers[AMS_INSTANCE_HEADER] = credentials.authorization_instance_id;
    headers["User-Agent"] = USER_AGENT;
}

function createHTTPSAgent(options) {
    return new https.Agent({
        cert: options.certificate,
        key: options.key,
    });
}

const readdir = fs.readdir;
async function filterDCLDirectory(ams_root, cb) {
    fs.readdir = function (path, cb, val3) {
        if (path.startsWith(ams_root)) {
            return readdir(path, async (err, files) => {
                if (err) {
                    return cb(err);
                }
                const filteredFiles = [];
                for (let i = 0; i < files.length; ++i) {
                    const f = files[i];
                    const stat = await fs.promises.stat(path + "/" + f);
                    if (stat.isFile()) {
                        if (f.endsWith(".dcl")) {
                            filteredFiles.push(f);
                        }
                    } else {
                        filteredFiles.push(f);
                    }
                }

                cb(null, filteredFiles);
            });
        } else {
            return readdir(path, cb, val3);
        }
    };
    await cb();
    fs.readdir = readdir;
}

class InMemoryStream extends stream.Writable {
    #buffer;
    constructor() {
        super();
        this.#buffer = Buffer.alloc(0);
    }

    _write(chunk, enc, next) {
        this.#buffer = Buffer.concat([this.#buffer, chunk]);
        next();
    }

    getBuffer() {
        return this.#buffer;
    }

    getString() {
        return this.#buffer.toString('utf-8');
    }

    getHash() {
        return createHash("sha256").update(this.#buffer).digest("hex");
    }
}

module.exports = {
    addDefaultHeaders,
    createHTTPSAgent,
    filterDCLDirectory,
    InMemoryStream
};