Function prepareStream

lib/api/apiUtils/object/prepareStream.js:16–32

* Prepares the stream if the chunks are sent in a v4 Auth request * @param {object} stream - stream containing the data * @param {object | null } streamingV4Params - if v4 auth, object containing * accessKey, signatureFromRequest, region, scopeDate, timestamp, and * credentialScope (to be used f

(stream, streamingV4Params, log, errCb)

 * the type of request requires them
 */
function prepareStream(stream, streamingV4Params, log, errCb) {
    if (stream.headers['x-amz-content-sha256'] ===
        'STREAMING-AWS4-HMAC-SHA256-PAYLOAD') {
        if (typeof streamingV4Params !== 'object') {
            // this might happen if the user provided a valid V2
            // Authentication header, while the chunked upload method
            // requires V4: in such case we don't get any V4 params
            // and we should return an error to the client.
            return null;
        }
        const v4Transform = new V4Transform(streamingV4Params, log, errCb);
        stream.pipe(v4Transform);
        v4Transform.headers = stream.headers;
        return v4Transform;
    }
    return stream;
}

function stripTrailingChecksumStream(stream, log) {
    // don't do anything if we are not in the correct integrity check mode