Code.gs

/**
 * Analytics Segment Provision in Tag Manager
 * @author: Dustin Recko
 * 
*/

var TAG_MANAGER_CONFIG = {
  accountId: '',
  containerId: '',
  workspaceId: ''
};

var ANALYTICS_CONFIG = {
  profileId: "", // Your Analytics view id, e.g. "ga:137778740"
  clientId: "" // The custom dimension where you store the Client Id, e.g. "ga:dimension4" 
};

var FIREBASE_CONFIG = {
  url: "", // Your Database URL
  auth: "" // Your Database Secret
};

function main() {
  
  init();
  var db = FirebaseApp.getDatabaseByUrl(FIREBASE_CONFIG.url,FIREBASE_CONFIG.auth);
  
  var i = new UserSegments();
  i.segments = i.uaGetSegments();
  i.tmPatchVariables();
  
  for(var y = 0, segments = Object.keys(i.segments), len = segments.length; y<len; y++) {
    i.uaGetUsers(segments[y]);
  }
  db.setData("",{});
  db.setData("", i.users);
  
}

function UserSegments() {
  
  this.parent = "accounts/"+TAG_MANAGER_CONFIG.accountId+"/containers/"+TAG_MANAGER_CONFIG.containerId+"/workspaces/"+TAG_MANAGER_CONFIG.workspaceId;
  this.segments = [];
  this.users = {};
  
  // Analytics Functions
  
  this.uaGetSegments = function() {
    var list = {};
    var segments = Analytics.Management.Segments.list();
    for (var i = 0, segment; segment = segments.items[i]; i++) {
      if(segment.created) // = Custom Segment
        list[segment.segmentId] = segment.name
    }
    return list;
  }
  
  this.uaGetUsers = function(segmentId) {
    var startDate = new Date().yyyymmdd(-90,'-');
    var endDate = new Date().yyyymmdd(0,'-');
    
    var tableId = ANALYTICS_CONFIG.profileId;
    var metric = 'ga:sessions';
    var options = {
      'dimensions': ANALYTICS_CONFIG.clientId,
      'segment': segmentId,
      'max-results': 10000
    };
    
    var report = Analytics.Data.Ga.get(tableId, startDate, endDate, metric, options);
    if (report.rows) {
      for(var i = 0, len = report.rows.length; i<len; i++) {
        var clientId = report.rows[i][0].replace(/\./g,'_');
        if(this.users[clientId]) {
          this.users[clientId].push(segmentId);
        } else {
          this.users[clientId] = [segmentId];
        }
      }
    }
    
  }
  
  // Tag Manager Functions
  
  this.tmGetVariables = function() {
    var arr = TagManager.Accounts.Containers.Workspaces.Variables.list(this.parent).variable;
    var obj = {};
    for(var i=0, len = arr.length;i<arr.length;i++) {
      obj[arr[i].name] = arr[i].variableId;
    }
    return obj;
  }
  
  this.tmPatchVariables = function() {
    var existingVariables = this.tmGetVariables();
    
    for (var segmentId in this.segments) {
      var value = this.segments[segmentId].replace(/^.*\sV([0-9]+)$/g,'$1');
      value = (value.match(/^[0-9]+$/g)) ? parseInt(value) : 0;
      var name = "User Segment - "+this.segments[segmentId].replace(/[^0-9a-z\s]/gi,'').replace(/\sV[0-9]+$/g,'')
      var variableResource = {
        "name": name,
        "type": "jsm",
        "parameter": [{
          "type": "template",
          "key": "javascript",
          "value": "function() {\n if(window.gaIds === undefined) return 'n|0'; return (window.gaIds.indexOf(\""+segmentId+"\") > -1 ? 'y' : 'n')+'|"+value+"';\n}"
        }]
      };

     if(Object.keys(existingVariables).indexOf(name) > -1) {
        TagManager.Accounts.Containers.Workspaces.Variables.update(variableResource, this.parent+'/variables/'+existingVariables[name]);
      } else
        TagManager.Accounts.Containers.Workspaces.Variables.create(variableResource, this.parent);
    }
  }
  
}

function init() {
  Date.prototype.yyyymmdd = function(days,separator) {
    separator = separator || '';
    if(days) {
      this.setDate(this.getDate() + days);
    }
    return Utilities.formatDate(this, Session.getScriptTimeZone(), ['yyyy','MM','dd'].join(separator));
  }
}