Refactor mailpoet.com url factory

[MAILPOET-2182]

assets/js/src/mailpoet.js

@@ -1,10 +1,10 @@
 import FeaturesController from 'features_controller';
-import MailPoetUrlFactory from 'mailpoet_url_factory';
+import MailPoetComUrlFactory from 'mailpoet_com_url_factory';
 
 // A placeholder for MailPoet object
 var MailPoet = {
   FeaturesController: FeaturesController(window.mailpoet_feature_flags),
-  MailPoetUrlFactory: MailPoetUrlFactory(window.mailpoet_referral_id),
+  MailPoetComUrlFactory: MailPoetComUrlFactory(window.mailpoet_referral_id),
 };
 
 // Expose MailPoet globally

assets/js/src/mailpoet_com_url_factory.js

@@ -0,0 +1,27 @@
+const MailPoetComUrlFactory = referralId => {
+  const baseUrl = 'https://www.mailpoet.com/';
+
+  const getUrl = (path, params) => {
+    let finalParams = params;
+    if (referralId) {
+      finalParams.ref = referralId;
+    }
+    const url = new URL(path, baseUrl);
+    Object.keys(finalParams).map(key => (url.searchParams.set(key, finalParams[key])));
+    return url.toString();
+  };
+
+  return {
+    getFreePlanUrl: (params) => {
+      const paramsObject = typeof params === 'object' ? params : {};
+      paramsObject.utm_source = 'plugin';
+      return getUrl('free-plan', paramsObject);
+    },
+
+    getPricingPageUrl: subscribers => (
+      getUrl('pricing', { subscribers })
+    ),
+  };
+};
+
+export default MailPoetComUrlFactory;

assets/js/src/mailpoet_url_factory.js

@@ -1,27 +0,0 @@
-const addReferralId = (url, referralId) => {
-  if (!referralId) {
-    return url;
-  }
-  const refUrl = new URL(url);
-  refUrl.searchParams.set('ref', referralId);
-  return refUrl.toString();
-};
-
-const MailPoetUrlFactory = referralId => ({
-  getFreePlanUrl: (utmCampaign = null, utmMedium = null) => {
-    const url = new URL(addReferralId('https://www.mailpoet.com/free-plan/?utm_source=plugin', referralId));
-    if (utmCampaign) {
-      url.searchParams.set('utm_campaign', utmCampaign);
-    }
-    if (utmMedium) {
-      url.searchParams.set('utm_medium', utmMedium);
-    }
-    return url.toString();
-  },
-
-  getPricingPageUrl: subscribersCount => (
-    addReferralId(`https://www.mailpoet.com/pricing/?subscribers=${subscribersCount}`, referralId)
-  ),
-});
-
-export default MailPoetUrlFactory;