AWS S3 Upload from Lambda Returns Blank PDF (Node.js)

Question

I have a Lambda using Axios to get a PDF from DocuSign using their REST API:

const url = `${base_uri}/restapi/v2.1/accounts/${account_id}/envelopes/${envelope_id}/documents/combined`;
const res = await axios.get(url, { headers: { Authorization: `Bearer ${token}` } });

Based on what I see in the res headers, the PDF has UTF-8 encoding:

headers: {
  'content-type': 'application/pdf',
   ...
  'content-disposition': `file; filename="Test1.pdf"; documentid="combined"; filename*=UTF-8''Test1.pdf`,
   ...
}

res.data is the content of the PDF & is a string. I've tried converting that to a <Buffer> using Buffer.from(res.data, 'utf-8'), and uploading that as the Body parameter of S3.putObject().

This will successfully upload the document to S3, with the proper file size and amount of pages, but downloading the PDF from S3 returns a blank document.

Downloading the document from Postman works perfectly, so I know the issue is not with the res.data returned from DocuSign.

Similar posts here on SO have got me thinking that I have an encoding issue when trying to convert the PDF to a <Buffer>. I've tried converting the encoding from UTF-8 to base64: same results, though I'm not certain I did it properly.

Many of the same post solutions utilize filestream solutions to convert the documents, unfortunately Lambda does not allow for the use of fs. So, in order to utilize fs, I've tried hitting the DocuSign API directly from the client app, but DocuSign doesn't allow for Cross-Origin-Resource-Sharing, so that's out.

Lastly, none of the solutions on similar posts address how to do this using JavaScript, it's all PHP & Python.

Here's the full code:

const downloadEnvelopeDocuments = async ({ envelope_id, account_id, base_uri, token }) => {
    try {

        const url = `${base_uri}/restapi/v2.1/accounts/${account_id}/envelopes/${envelope_id}/documents/combined`
        const res = await axios.get(url, { headers: { Authorization: `Bearer ${token}` }});

        await S3.putObject({
          Bucket: 'targetBucket',
          Key: 'targetDir/docusign-test.pdf',
          Body: Buffer.from(res.data, 'utf8')
        })
        .promise();

    } catch (err) {
        //log error
    }
};

---

Here's the full response from DocuSign, minus the full res.data since it's well over 30,000 characters long (looking at 200,000+ characters):

{
  status: 200,
  statusText: 'OK',
  headers: {
    'cache-control': 'no-cache',
    'content-length': '167989',
    'content-type': 'application/pdf',
    'x-ratelimit-reset': '1588881600',
    'x-ratelimit-remaining': '998',
    'x-ratelimit-limit': '1000',
    'x-burstlimit-remaining': '498',
    'x-burstlimit-limit': '500',
    'x-docusign-tracetoken': '1da5c492-4709-449e-90fa-c6b31d12b4ac',
    'content-disposition': `file; filename="Test1.pdf"; documentid="combined"; filename*=UTF-8''Test1.pdf`,
    date: 'Thu, 07 May 2020 19:17:50 GMT',
    connection: 'close'
  },
  config: {
    url: 'https://demo.docusign.net/restapi/v2.1/accounts/[REDACTED]/envelopes/[REDACTED]/documents/combined',
    method: 'get',
    headers: {
      Accept: 'application/json, text/plain, */*',
      Authorization: 'Bearer [REDACTED]',
      'User-Agent': 'axios/0.19.2'
    },
    transformRequest: [ [Function: transformRequest] ],
    transformResponse: [ [Function: transformResponse] ],
    timeout: 0,
    adapter: [Function: httpAdapter],
    xsrfCookieName: 'XSRF-TOKEN',
    xsrfHeaderName: 'X-XSRF-TOKEN',
    maxContentLength: -1,
    validateStatus: [Function: validateStatus],
    data: undefined
  },
  request: ClientRequest {
    _events: [Object: null prototype] {
      socket: [Function],
      abort: [Function],
      aborted: [Function],
      error: [Function],
      timeout: [Function],
      prefinish: [Function: requestOnPrefinish]
    },
    _eventsCount: 6,
    _maxListeners: undefined,
    outputData: [],
    outputSize: 0,
    writable: true,
    _last: true,
    chunkedEncoding: false,
    shouldKeepAlive: false,
    useChunkedEncodingByDefault: false,
    sendDate: false,
    _removedConnection: false,
    _removedContLen: false,
    _removedTE: false,
    _contentLength: 0,
    _hasBody: true,
    _trailer: '',
    finished: true,
    _headerSent: true,
    socket: TLSSocket {
      _tlsOptions: [Object],
      _secureEstablished: true,
      _securePending: false,
      _newSessionPending: false,
      _controlReleased: true,
      _SNICallback: null,
      servername: false,
      alpnProtocol: false,
      authorized: true,
      authorizationError: null,
      encrypted: true,
      _events: [Object: null prototype],
      _eventsCount: 9,
      connecting: false,
      _hadError: false,
      _parent: null,
      _host: 'demo.docusign.net',
      _readableState: [ReadableState],
      readable: true,
      _maxListeners: undefined,
      _writableState: [WritableState],
      writable: false,
      allowHalfOpen: false,
      _sockname: null,
      _pendingData: null,
      _pendingEncoding: '',
      server: undefined,
      _server: null,
      ssl: [TLSWrap],
      _requestCert: true,
      _rejectUnauthorized: true,
      parser: null,
      _httpMessage: [Circular],
      [Symbol(res)]: [TLSWrap],
      [Symbol(asyncId)]: 404,
      [Symbol(kHandle)]: [TLSWrap],
      [Symbol(lastWriteQueueSize)]: 0,
      [Symbol(timeout)]: null,
      [Symbol(kBuffer)]: null,
      [Symbol(kBufferCb)]: null,
      [Symbol(kBufferGen)]: null,
      [Symbol(kCapture)]: false,
      [Symbol(kBytesRead)]: 0,
      [Symbol(kBytesWritten)]: 0,
      [Symbol(connect-options)]: [Object]
    },
    connection: TLSSocket {
      _tlsOptions: [Object],
      _secureEstablished: true,
      _securePending: false,
      _newSessionPending: false,
      _controlReleased: true,
      _SNICallback: null,
      servername: false,
      alpnProtocol: false,
      authorized: true,
      authorizationError: null,
      encrypted: true,
      _events: [Object: null prototype],
      _eventsCount: 9,
      connecting: false,
      _hadError: false,
      _parent: null,
      _host: 'demo.docusign.net',
      _readableState: [ReadableState],
      readable: true,
      _maxListeners: undefined,
      _writableState: [WritableState],
      writable: false,
      allowHalfOpen: false,
      _sockname: null,
      _pendingData: null,
      _pendingEncoding: '',
      server: undefined,
      _server: null,
      ssl: [TLSWrap],
      _requestCert: true,
      _rejectUnauthorized: true,
      parser: null,
      _httpMessage: [Circular],
      [Symbol(res)]: [TLSWrap],
      [Symbol(asyncId)]: 404,
      [Symbol(kHandle)]: [TLSWrap],
      [Symbol(lastWriteQueueSize)]: 0,
      [Symbol(timeout)]: null,
      [Symbol(kBuffer)]: null,
      [Symbol(kBufferCb)]: null,
      [Symbol(kBufferGen)]: null,
      [Symbol(kCapture)]: false,
      [Symbol(kBytesRead)]: 0,
      [Symbol(kBytesWritten)]: 0,
      [Symbol(connect-options)]: [Object]
    },
    _header: 'GET /restapi/v2.1/accounts/[REDACTED]/envelopes/[REDACTED]/documents/combined HTTP/1.1\r\n' +
      'Accept: application/json, text/plain, */*\r\n' +
      'Authorization: Bearer [REDACTED]\r\n' +
      'User-Agent: axios/0.19.2\r\n' +
      'Host: demo.docusign.net\r\n' +
      'Connection: close\r\n' +
      '\r\n',
    _onPendingData: [Function: noopPendingOutput],
    agent: Agent {
      _events: [Object: null prototype],
      _eventsCount: 2,
      _maxListeners: undefined,
      defaultPort: 443,
      protocol: 'https:',
      options: [Object],
      requests: {},
      sockets: [Object],
      freeSockets: {},
      keepAliveMsecs: 1000,
      keepAlive: false,
      maxSockets: Infinity,
      maxFreeSockets: 256,
      maxCachedSessions: 100,
      _sessionCache: [Object],
      [Symbol(kCapture)]: false
    },
    socketPath: undefined,
    method: 'GET',
    insecureHTTPParser: undefined,
    path: '/restapi/v2.1/accounts/[REDACTED]/envelopes/[REDACTED]/documents/combined',
    _ended: true,
    res: IncomingMessage {
      _readableState: [ReadableState],
      readable: false,
      _events: [Object: null prototype],
      _eventsCount: 3,
      _maxListeners: undefined,
      socket: [TLSSocket],
      connection: [TLSSocket],
      httpVersionMajor: 1,
      httpVersionMinor: 1,
      httpVersion: '1.1',
      complete: true,
      headers: [Object],
      rawHeaders: [Array],
      trailers: {},
      rawTrailers: [],
      aborted: false,
      upgrade: false,
      url: '',
      method: null,
      statusCode: 200,
      statusMessage: 'OK',
      client: [TLSSocket],
      _consuming: true,
      _dumped: false,
      req: [Circular],
      responseUrl: 'https://demo.docusign.net/restapi/v2.1/accounts/[REDACTED]/envelopes/[REDACTED]/documents/combined',
      redirects: [],
      [Symbol(kCapture)]: false
    },
    aborted: false,
    timeoutCb: null,
    upgradeOrConnect: false,
    parser: null,
    maxHeadersCount: null,
    reusedSocket: false,
    _redirectable: Writable {
      _writableState: [WritableState],
      writable: true,
      _events: [Object: null prototype],
      _eventsCount: 2,
      _maxListeners: undefined,
      _options: [Object],
      _redirectCount: 0,
      _redirects: [],
      _requestBodyLength: 0,
      _requestBodyBuffers: [],
      _onNativeResponse: [Function],
      _currentRequest: [Circular],
      _currentUrl: 'https://demo.docusign.net/restapi/v2.1/accounts/[REDACTED]/envelopes/[REDACTED]/documents/combined',
      [Symbol(kCapture)]: false
    },
    [Symbol(kCapture)]: false,
    [Symbol(kNeedDrain)]: false,
    [Symbol(corked)]: 0,
    [Symbol(kOutHeaders)]: [Object: null prototype] {
      accept: [Array],
      authorization: [Array],
      'user-agent': [Array],
      host: [Array]
    }
  },
  data: '%PDF-1.5\n' +
    '%����\n' +
    '%Writing objects...\n' +
    '4 0 obj\n' +
    '<<\n' +
    '/Type /Page\n' +
    '/Resources 5 0 R\n' +
    '/Contents [6 0 R 7 0 R 8 0 R ]\n' +
    '/MediaBox [0 0 612 792 ]\n' +
    '/Parent 3 0 R\n' +
    '/StructParents 0\n' +
    '>>\n' +
    'endobj\n' +
    '5 0 obj\n' +
    '<<\n' +
    '/ExtGState <<\n' +
    '/G3 9 0 R\n' +
    '>>\n' +
    '/Font <<\n' +
    '/F4 10 0 R\n' +
    '/F5 11 0 R\n' +
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    '/ProcSet [/PDF /Text /ImageB /ImageC /ImageI ]\n' +
    '/XObject <<\n' +
    '/X0 12 0 R\n' +
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    'endobj\n' +
    '2 0 obj\n' +
    '<<\n' +
    '/Producer (PDFKit.NET 20.1.200.12352)\n' +
    "/CreationDate (D:20200507121751-07'00')\n" +
    "/ModDate (D:20200507121751-07'00')\n" +
    '/Author ()\n' +
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...

Answer 1

I had the same problem using the Docusign SDK. The problem is that the api returns a string for the document, which contains binary but is read by default everywhere as UTF-8.

Therefore the solution is parse it into a Buffer with binary encoding and upload that Buffer to S3

    const document = await envelopesApi.getDocument(
      accountId,
      envelopeId,
      'combined', // documentId
      { certificate: 'false' }
    );
    return Buffer.from(document, 'binary');

Answer 2

As an alternative to the raw pdf, you can also convert the response data to base64. Just include this header 'Content-Transfer-Encoding':'base64'.