Meraki Webooks Demo with Google Sheets

Code.gs

/*
Copy this function over the existing Code.gs file in a Google Sheet
Save the Sheet/Script
Publish App 
- Execute as You
- Avaiable to Anyone (including anonymous)
Authorize App when prompted
The URL will act as the Webhook URL for Meraki to send alerts
*/

// Flattens a nested object for easier use with a spreadsheet
function flattenObject(ob) {
   var toReturn = {};	
	for (var i in ob) {
		if (!ob.hasOwnProperty(i)) continue;		
		if ((typeof ob[i]) == 'object') {
			var flatObject = flattenObject(ob[i]);
			for (var x in flatObject) {
				if (!flatObject.hasOwnProperty(x)) continue;				
				toReturn[i + '.' + x] = flatObject[x];
			}
		} else {
			toReturn[i] = ob[i];
		}
	}
	return toReturn;
};

// formats a key/value to UTC time based on selected keys
function changeTimeFormat(key,value){
  var keysToFormat = ['sentAt', 'occurredAt','alertData.timestamp'];
  if(keysToFormat.indexOf(key) > -1){
        var date = new Date(value*1000).toUTCString();
        return date 
  }else{
    return value;
  }
}

// Google sheets are created with 26 columns, but some alerts contain more than 26 keys 
// As each key is inserted into its own column, having more keys than columns causes an out of bounds error 
// This functions add the appropirate amount of extra columns if required
function addExtraColumns(alertSheet, keylength) { 
  var sheet_column_count = alertSheet.getMaxColumns() 
  var extra_columns_required = keylength - sheet_column_count 
  if (extra_columns_required > 0) { 
    alertSheet.insertColumns(1, extra_columns_required) 
  } 
} 

function setHeaders(sheet, values){
   var headerRow = sheet.getRange(1, 1, 1, values.length)
    headerRow.setValues([values]);  
    headerRow.setFontWeight("bold").setHorizontalAlignment("center");
}

function display(data){
  
  // Flatten JSON object and extract keys and values into seperate arrays
  var flat = flattenObject(data);
  var keys = Object.keys(flat);
  var values = [];
  var headers = [];
  var alertSheet;
  
  // Find or create sheet for alert type and set headers
  var alertType = data['alertType'];
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  if (ss.getSheetByName(alertType) == null){
    ss.insertSheet(alertType); 
    // Create Headers and Format
    alertSheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(alertType);
    addExtraColumns(alertSheet, keys.length)
    alertSheet.setColumnWidths(1, keys.length, 200)
    headers = keys;
  }else {
    alertSheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(alertType);
    // retrieve existing headers
    headers = alertSheet.getRange(1, 1, 1, alertSheet.getLastColumn() || 1).getValues()[0]; 
    //headers = [headers];
    Logger.log('existing headers: ' + headers);
    Logger.log('keys: '+ keys);
    // add any additional headers
    var newHeaders = [];
    newHeaders = keys.filter(function(k){ return headers.indexOf(k)>-1?false:k;});
    Logger.log('adding new headers: ' + newHeaders);
    newHeaders.forEach(function(h){
      headers.push(h);
    });  
  }
  Logger.log('headers: ' + headers);
  setHeaders(alertSheet, headers);
  
  // push values based on headers
  headers.forEach(function(h){
    Logger.log('h: '+h);
    Logger.log('flat[h]: '+flat[h]);
    //var formattedValue = changeTimeFormat(h,flat[h]);
    //Logger.log('formattedValue: '+formattedValue);
    //values.push(formattedValue);
    values.push(flat[h]);
  });
  
  // Insert Data into Sheet
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(alertType);
  var lastRow = Math.max(sheet.getLastRow(),1);
  sheet.insertRowAfter(lastRow); 
  sheet.getRange(lastRow + 1, 1, 1, headers.length).setValues([values]).setFontWeight("normal").setHorizontalAlignment("center");
 
}

// Webhook GET request. Simply verifies that server is reachable.
function doGet(e) {
  return HtmlService.createHtmlOutput("Meraki Webhook Google Sheets");
}

// Webhook Receiver - triggered with post to pusblished App URL.
function doPost(e) {
  var params = JSON.stringify(e.postData.contents);
  params = JSON.parse(params);
  var postData = JSON.parse(params);
  
  display(postData);
  
  // HTTP Response
  return HtmlService.createHtmlOutput("post request received");
}

var testData = {
    "alertData": {
      "timestamp": 1536127239.706,
      "roi": { "top": 0, "left": 0, "width": 60, "height": 33 }
    },
    "alertId": "643451796765275003",
    "alertType": "Motion detected",
    "occurredAt": 1536127340.8236248,
    "sentAt": 1536127344.593023,
    "organizationId": "306XXXXX",
    "organizationName": "Miles Laboratory",
    "organizationUrl": "https://n143.meraki.com/o/3ZZIub/manage/organization/overview",
    "networkId": "L_643451796760XXXXX",
    "networkName": "Miles- Home",
    "networkUrl": "https://n143.meraki.com/Miles-Ho/n/RSv2xapc/manage/nodes/list",
    "deviceSerial": "Q2GV-ZZZZ-XXXX",
    "deviceMac": "34:56:fe:a3:24:06",
    "deviceName": "MV12w-desk-06",
    "deviceUrl": "https://n143.meraki.com/Miles-Ho/n/RSv2xapc/manage/nodes/new_list/57548243936262",
    "testParam2":"bar"
  };

function test(){ 
  display(testData);
}

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I tried this and when I run the test it populates my sheet, but I am not getting data from my network alerts and when I try to run > doPost from the script editor I get:

[18-10-24 10:22:30:171 PDT] Starting execution
[18-10-24 10:22:30:180 PDT] Execution failed: TypeError: Cannot read property "postData" from undefined. (line 106, file "Code") [0 seconds total runtime]

I've updated the code to remove the timestamp conversion from epoch to UTC. The webhook JSON object has been adjusted by Meraki to deliver some of the timestamps in UTC for easier usage. (but it broke the code, so I've removed breaking function)

I am receiving the following error after using the updated script
TypeError: Cannot find function hasOwnProperty in object FULL. (line 15, file "Code")
This error is generated form flattenObject function. How should I resolve this?

@dexterlabora Some Meraki webhooks are sent with more than 26 keys (such as the "motion detected" alerts), however, Google Sheets are always created with 26 columns. This causes "an out of bounds" error on line 62 where keys.length is greater than the amount of available columns. This can be verified by adding additional key-value pairs to the testData.

6:11:30 PM	Error	 
Exception: Those columns are out of bounds. 
display	@ Code.gs:62 
test	@ Code.gs:155

This can be fixed by adding the following:
Add this line before line 62: addExtraColumns(alertSheet, keys.length)
Add this function somewhere in the script:

// Google sheets are created with 26 columns, but some alerts contain more than 26 keys 
// As each key is inserted into its own column, having more keys than columns causes an out of bounds error 
// This functions add the appropirate amount of extra columns if required
function addExtraColumns(alertSheet, keylength) { 
  var sheet_column_count = alertSheet.getMaxColumns() 
  var extra_columns_required = keylength - sheet_column_count 
  if (extra_columns_required > 0) { 
    alertSheet.insertColumns(1, extra_columns_required) 
  } 
} 

My fork can be found here

Would you be able to get this gist updated? Thanks!

@insidus341 I added your suggestions to the gist. Thanks for the feedback!