Fetch data from plausible instance for an URL in Google Sheet

plausible_url_call.gs

function PLAUSIBLE(url, period, fields) {
  /**
   * This function call plausible API, and can be use from Google Sheet
   * url : The full url to the page
   * period : control the period. Possible value : "day" (today, default), "6mo", "12mo", "30d", "7d", or "custom&date=2022-04-22,2022-04-22".
   * fields : by default "visitors,visits,pageviews". A coma separated list of field returned. Can also be bounce_rate, visit_duration 
   * 
   * full doc : https://plausible.io/docs/stats-api#filtering
   */

  var BASE_URL = "";
  var TOKEN = "";

  // extract domain
  var regExp = new RegExp("((?:[a-z]*)\.(?:com|fr))\/", "gi");
  var domain = regExp.exec(url)[1];
  var page = url.substring(url.indexOf(domain)+domain.length);

  if (!period){ period = "day";  } // no date = today
  if (!fields){ fields = "visitors,visits,pageviews" }
  var fields_array = fields.split(",");

  var plusOptions = { "headers" : { "Authorization" : "Bearer " + TOKEN } };
  var apiurl = BASE_URL+"/api/v1/stats/aggregate?site_id="+domain+"&period="+period+"&metrics="+fields+"&&filters=event:page==" + page;
  var response = UrlFetchApp.fetch(apiurl, plusOptions);
  var data = JSON.parse(response.getContentText());
  if (data){
    var results = data['results'];
    var obj = [];
    for(var i = 0; i < fields_array.length; i++){
      obj.push(results[fields_array[i]]['value']);
    }
    return [obj]; // double array for line printing
  }else{
    return "Error";
  }
}