@sap/cds-dk/bin/data-products/get-csn-via-dp-cli.js

Command line client and development toolkit for the SAP Cloud Application Programming Model

const child_process = require ('node:child_process')
const fs = require ('node:fs')

exports.getDataProductCsnViaDpCli = function (ordId) {
    if (dpCliIsAvailable()) {
        const [namespace, , name, version] = ordId.split(':')
        const apiHubName = [namespace, name, version].join('-').replaceAll('.', '-');
        const dataProductMetadata = getDataProductMetadata(apiHubName);
        if (dataProductMetadata.OrdId !== ordId) {
            throw new Error(`Data Product with OrdId ${ordId} not found in API Hub!`)
        }

        return getDataProductCsn(apiHubName);
    }
}

function dpCliIsAvailable() {
    try {
        const output = child_process.execSync('which dp-cli').toString();
        return typeof output === 'string' && output.length > 0;
    } catch {
        return false;
    }
}

function getDataProductMetadata(apiHubName) {
    const metadataString = child_process.execSync('dp-cli get -m ' + apiHubName).toString();
    return JSON.parse(metadataString);
}


function getDataProductCsn(apiHubName) {
    if (fs.existsSync(apiHubName + '.json')) {
        throw new Error(`Temporary file ${apiHubName}.json already exists! Please remove it before running this command again - or import directly from the file.`)
    }
    // TODO: Do not pipe to file but rather save in memory via custom stream?
    child_process.execSync('dp-cli get ' + apiHubName, { stdio: ['pipe', fs.openSync(apiHubName + '.json', 'w'), 'pipe'] });
    const csn = fs.readFileSync(apiHubName + '.json', 'utf-8');
    fs.unlinkSync(apiHubName + '.json');
    return JSON.parse(csn);
}