extractJsonToContextVars.js

// extractJsonToContextVars.js
// ------------------------------------------------------------------
//
// For a JSON payload, set context vars for all fields.
//
// Use a policy config like this:
//
// <Javascript name='JS-RipJiraResponse' timeLimit='200' >
//   <Properties>
//     <Property name='prefix'>json</Property>
//     <Property name='source'>jiraResponse</Property>
//   </Properties>
//   <IncludeURL>jsc://walkObj.js</IncludeURL>
//   <ResourceURL>jsc://extractJsonToContextVars.js</ResourceURL>
// </Javascript>
//
// created: Tue Mar  7 16:32:14 2017
// last saved: <2018-February-26 19:26:07>

function isValidMessage(sourceMsg) {
  var verb = context.getVariable(sourceMsg + '.verb');
  if (verb) return true;
  // else a response message, check the status code
  var statusCode = context.getVariable(sourceMsg + '.status.code') + '';
  return (statusCode == '200');
}

var sourceMsg = properties.source || 'message';
if (isValidMessage(sourceMsg)) {
  var ctype = context.getVariable(sourceMsg + '.header.content-type');
  if (ctype.indexOf("application/json") === 0) {
    walkObj(JSON.parse(context.getVariable(sourceMsg + '.content')),
            properties.prefix || 'json',
            function(name, value) {
              context.setVariable(name, value);
            });
  }
  else {
    context.setVariable((properties.prefix || 'json') + '.' + sourceMsg + '.error', "not json content");
  }
}
else {
  context.setVariable((properties.prefix || 'json') + '.' + sourceMsg + '.error', "bad inbound message");
}


// example inbound payload:
//
// {
//   "name": "rooms/BBG-BjYE/conversations/qo4A887E/messages/Ko4NQABE",
//   "sender": {
//     "name": "users/11388443469853495",
//     "displayName": "Dino Chiesa",
//     "avatarUrl": "https://lh4.googleusercontent.com/ADg/hxfWDAGRhDY/photo.jpg",
//     "email": "dchiesa@google.com"
//   },
//   "createTime": "2017-03-07T23:53:04.504207Z",
//   "text": "/jira MGMT-3909"
// };

// result is, context variables set like this:
// json.name = "rooms/BBG-BjYE/conversations/qo4A887E/messages/Ko4NQABE"
// json.sender.name = "users/11388443469853495"
// json.sender.displayName = "Dino Chiesa"
// json.sender.avatarUrl = "https://lh4.googleusercontent.com/ADg/hxfWDAGRhDY/photo.jpg"
// json.sender.email = "dchiesa@google.com"
// json.createTime = "2017-03-07T23:53:04.504207Z"
// json.text = "/jira MGMT-3909"

walkObj.js

// walkObj.js
// ------------------------------------------------------------------
//
// created: Mon Feb 26 19:00:50 2018
// last saved: <2018-August-01 16:13:20>

(function (){
  'use strict';
  var what = Object.prototype.toString;

  function walkObj(obj, path, fn) {
    if ( ! fn && typeof path == 'function') {
      fn = path;
      path = 'json';
    }
    var wo = what.call(obj), p;
    path = path || '';

    if (wo == "[object Object]") {
      Object.keys(obj).forEach(function(key){
        var item = obj[key], w = what.call(item);
        var pathelts = (path == '')?[] : path.split('.');
        pathelts.push(key);
        var newpath = pathelts.join('.');
        if (w == "[object Object]" || w == "[object Array]") {
          walkObj(item, newpath, fn);
        }
        else {
          fn(newpath, item, key, obj);
        }
      });
    }
    else if (wo == "[object Array]") {
      obj.forEach(function(item, ix){
        var w = what.call(item);
        var pathelts = path.split('.');
        pathelts.push('['+ix+']');
        var newpath = pathelts.join('.');
        if (w == "[object Object]" || w == "[object Array]") {
          walkObj(item, newpath, fn);
        }
        else {
          fn(newpath, item);
        }
      });
    }
    else {
      var msg  = "Unknown object to convert: " + wo + "("+ JSON.stringify(obj, null, 2).slice(0, 34) +")";
      //console.log(msg);
      throw {error: true, message: msg };
    }
  }

  // export to global scope
  var globalScope = (function(){ return this; }).call(null);
  if (globalScope)
    globalScope.walkObj = walkObj;

  if (module) {
    module.exports = walkObj;
  }

}());