A simple proxy script for filtering out data fields and masking the URL of Fulcrum data shares. Specify ?format=csv to return CSV instead of default GeoJSON.

datashare-proxy.php

<?php
# Fields to be removed (optional)
$remove = ['fulcrum_id','created_by','updated_by','assigned_to'];
# Fulcrum data share ID
$shareID = 'your-share-id';
# Format- 'geojson' or 'csv'
if (isset($_GET['format'])) {
  $format = $_GET['format'];
} else {
  $format = 'geojson';
}
# Fetch the GeoJSON
$geojson = file_get_contents('https://web.fulcrumapp.com/shares/'.$shareID.'.geojson');
# Error on bad link
if($geojson === false) {
  exit('Unable to access data share contents. Please verify <a href=\'https://web.fulcrumapp.com/shares/' . $shareID . '.geojson\'>https://web.fulcrumapp.com/shares/' . $shareID . '.geojson</a> is an active data share.');
}
# Decode JSON into associative arrays
$data = json_decode($geojson, TRUE);
# Array to hold the properties
$properties = array();
# Array to hold the csv rows
$rows = array();
# Loop through GeoJSON FeatureCollection features
foreach ($data['features'] as $featureKey => &$featureValue) {
  # Remove unwanted fields
  if (isset($remove)) {
    foreach ($remove as $key => $value) {
      unset($featureValue['properties'][$value]);
    }
  }
  # Array to hold csv header fields
  $fields = array();
  # Loop through GeoJSON feature properties to get csv fields and values
  foreach ($featureValue['properties'] as $key => $value) {
    array_push($fields, $key);
    $properties[$key] = $value;
  }
  # Add properties to csv rows array
  array_push($rows, $properties);
}
if ($format === 'csv') {
  header('Content-type: text/csv');
  header('Content-Disposition: attachment; filename=fulcrum.csv');
  header('Pragma: no-cache');
  header('Expires: 0');
  $csv = fopen('php://output', 'w');
  # Add header to csv
  fputcsv($csv, $fields);
  # Add data to Csv
  foreach ($rows as $row) {
    fputcsv($csv, $row);
  }
}
if ($format === 'geojson') {
  header('Content-type: application/json');
  echo json_encode($data);
}
?>