Cocoa Nub Cocoa Nub - 7 months ago 60
Javascript Question

Parsing Gmail Batch response in Javascript

I'm using javascript to call the /batch API method for getting a number of messages at once. According to the docs it returns an HTTP response with a multipart/mixed content type. I'm trying to loop through this as JSON, but am not sure how to convert it. Any help would be greatly appreciated. Thanks!

Answer

I have written a tiny library for this. You could use that or maybe get some inspiration from the code:

function parseBatchResponse(response) {
  // Not the same delimiter in the response as we specify ourselves in the request,
  // so we have to extract it.
  var delimiter = response.substr(0, response.indexOf('\r\n'));
  var parts = response.split(delimiter);
  // The first part will always be an empty string. Just remove it.
  parts.shift();
  // The last part will be the "--". Just remove it.
  parts.pop();

  var result = [];
  for (var i = 0; i < parts.length; i++) {
    var part = parts[i];
    var p = part.substring(part.indexOf("{"), part.lastIndexOf("}") + 1);
    result.push(JSON.parse(p));
  }
  return result;
}