[ParrableIdSystem] Accept lowercase timezone names in timezone filter

modules/parrableIdSystem.js

@@ -6,6 +6,7 @@
  */
 
 import * as utils from '../src/utils.js'
+import find from 'core-js-pure/features/array/find.js';
 import { ajax } from '../src/ajax.js';
 import { submodule } from '../src/hook.js';
 import { getRefererInfo } from '../src/refererDetection.js';
@@ -137,12 +138,18 @@ function shouldFilterImpression(configParams, parrableId) {
   const offset = (new Date()).getTimezoneOffset() / 60;
   const zone = Intl.DateTimeFormat().resolvedOptions().timeZone;
 
+  function isZoneListed(list, zone) {
+    // IE does not provide a timeZone in IANA format so zone will be empty
+    const zoneLowercase = zone && zone.toLowerCase();
+    return !!(list && zone && find(list, zn => zn.toLowerCase() === zoneLowercase));
+  }
+
   function isAllowed() {
     if (utils.isEmpty(config.allowedZones) &&
       utils.isEmpty(config.allowedOffsets)) {
       return true;
     }
-    if (utils.contains(config.allowedZones, zone)) {
+    if (isZoneListed(config.allowedZones, zone)) {
       return true;
     }
     if (utils.contains(config.allowedOffsets, offset)) {
@@ -156,7 +163,7 @@ function shouldFilterImpression(configParams, parrableId) {
       utils.isEmpty(config.blockedOffsets)) {
       return false;
     }
-    if (utils.contains(config.blockedZones, zone)) {
+    if (isZoneListed(config.blockedZones, zone)) {
       return true;
     }
     if (utils.contains(config.blockedOffsets, offset)) {
@@ -165,7 +172,7 @@ function shouldFilterImpression(configParams, parrableId) {
     return false;
   }
 
-  return !isAllowed() || isBlocked();
+  return isBlocked() || !isAllowed();
 }
 
 function fetchId(configParams, gdprConsentData) {

test/spec/modules/parrableIdSystem_spec.js

@@ -305,6 +305,20 @@ describe('Parrable ID System', function() {
       expect(resolvedOptions.called).to.equal(true);
     });
 
+    it('permits an impression from a lower cased allowed timezone', function() {
+      const allowedZone = 'America/New_York';
+      const resolvedOptions = sinon.stub().returns({ timeZone: allowedZone });
+      Intl.DateTimeFormat.returns({ resolvedOptions });
+
+      expect(parrableIdSubmodule.getId({ params: {
+        partner: 'prebid-test',
+        timezoneFilter: {
+          allowedZones: [ allowedZone.toLowerCase() ]
+        }
+      } })).to.have.property('callback');
+      expect(resolvedOptions.called).to.equal(true);
+    });
+
     it('permits an impression from a timezone that is not blocked', function() {
       const blockedZone = 'America/New_York';
       const resolvedOptions = sinon.stub().returns({ timeZone: 'Iceland' });
@@ -333,6 +347,20 @@ describe('Parrable ID System', function() {
       expect(resolvedOptions.called).to.equal(true);
     });
 
+    it('does not permit an impression from a lower cased blocked timezone', function() {
+      const blockedZone = 'America/New_York';
+      const resolvedOptions = sinon.stub().returns({ timeZone: blockedZone });
+      Intl.DateTimeFormat.returns({ resolvedOptions });
+
+      expect(parrableIdSubmodule.getId({ params: {
+        partner: 'prebid-test',
+        timezoneFilter: {
+          blockedZones: [ blockedZone.toLowerCase() ]
+        }
+      } })).to.equal(null);
+      expect(resolvedOptions.called).to.equal(true);
+    });
+
     it('does not permit an impression from a blocked timezone even when also allowed', function() {
       const timezone = 'America/New_York';
       const resolvedOptions = sinon.stub().returns({ timeZone: timezone });