// KaiOS 2.x specific part to connect and retrieve raw data from Gopher servers
// Requires "tcp-socket" permission in the manifest
// and the "privileged" or "certified" app permission level
// resource format: [type, selector, host, port]
// type is autotrimmed, so you don't have to manually strip the description
// input is optional and only considered for resource type 7

function gopherRequest(resource, input, successCb, errorCb) {
  var xsock = navigator.mozTCPSocket.open(resource[2], (resource[3]||70) | 0, {binaryType: 'string'}),
      type = resource[0][0], databuf = ''
  xsock.ondata = function(data) {
    databuf += data.data
  }
  xsock.onclose = function() {
    successCb(databuf, type)
  }
  xsock.onerror = errorCb
  xsock.onopen = function() {
    var selpath = resource[1]
    if(type == '7' && input)
      selpath += '\t' + input
    xsock.send(selpath + '\r\n') // send CRLF-terminated selector path and optionally the search string
  }
}