DEV: don't add username to share links when badges are disabled (#10730)

Context: https://meta.discourse.org/t/stop-appending-username-to-url-when-badge-system-disabled/164904

Share links for topics and posts have the current username appended to them when the user is logged in. 

If badges are disabled, those added usernames are not beneficial since they're only used to track progress towards certain badges. 

This PR makes two change. 

1. it moves the logic for the share link url to a centralized helper because it's shared in both topic and post models. 
2. it stops username params from being added to share links when badges are disabled.

app/assets/javascripts/discourse/app/helpers/share-url.js

@@ -0,0 +1,8 @@
+import { helperContext } from "discourse-common/lib/helpers";
+
+export function resolveShareUrl(url, user) {
+  const badgesEnabled = helperContext().siteSettings.enable_badges;
+  const userSuffix = user && badgesEnabled ? `?u=${user.username_lower}` : "";
+
+  return url + userSuffix;
+}

app/assets/javascripts/discourse/app/models/post.js

@@ -17,18 +17,13 @@ import Site from "discourse/models/site";
 import User from "discourse/models/user";
 import showModal from "discourse/lib/show-modal";
 import { fancyTitle } from "discourse/lib/topic-fancy-title";
+import { resolveShareUrl } from "discourse/helpers/share-url";
 
 const Post = RestModel.extend({
   @discourseComputed("url")
   shareUrl(url) {
     const user = User.current();
-    const userSuffix = user ? `?u=${user.username_lower}` : "";
-
-    if (this.firstPost) {
-      return this.get("topic.url") + userSuffix;
-    } else {
-      return url + userSuffix;
-    }
+    return resolveShareUrl(url, user);
   },
 
   new_user: equal("trust_level", 0),

app/assets/javascripts/discourse/app/models/topic.js

@@ -24,6 +24,7 @@ import Site from "discourse/models/site";
 import User from "discourse/models/user";
 import bootbox from "bootbox";
 import { deepMerge } from "discourse-common/lib/object";
+import { resolveShareUrl } from "discourse/helpers/share-url";
 
 export function loadTopicView(topic, args) {
   const data = deepMerge({}, args);
@@ -242,8 +243,7 @@ const Topic = RestModel.extend({
   @discourseComputed("url")
   shareUrl(url) {
     const user = User.current();
-    const userQueryString = user ? `?u=${user.get("username_lower")}` : "";
-    return `${url}${userQueryString}`;
+    return resolveShareUrl(url, user);
   },
 
   printUrl: fmt("url", "%@/print"),

test/javascripts/acceptance/share-and-invite-desktop-test.js

@@ -70,3 +70,25 @@ QUnit.test("Post date link", async (assert) => {
 
   assert.ok(exists("#share-link"), "it shows the share modal");
 });
+
+acceptance("Share url with badges disabled - desktop", {
+  loggedIn: true,
+  settings: {
+    enable_badges: false,
+  },
+});
+
+QUnit.test(
+  "topic footer button - badges disabled - desktop",
+  async (assert) => {
+    await visit("/t/internationalization-localization/280");
+    await click("#topic-footer-button-share-and-invite");
+
+    assert.notOk(
+      find(".share-and-invite.modal .modal-panel.share .topic-share-url")
+        .val()
+        .includes("?u=eviltrout"),
+      "it doesn't add the username param when badges are disabled"
+    );
+  }
+);

test/javascripts/acceptance/share-and-invite-mobile-test.js

@@ -60,3 +60,26 @@ QUnit.test("Post date link", async (assert) => {
 
   assert.ok(exists("#share-link"), "it shows the share modal");
 });
+
+acceptance("Share url with badges disabled - mobile", {
+  loggedIn: true,
+  mobileView: true,
+  settings: {
+    enable_badges: false,
+  },
+});
+
+QUnit.test("topic footer button - badges disabled - mobile", async (assert) => {
+  await visit("/t/internationalization-localization/280");
+
+  const subject = selectKit(".topic-footer-mobile-dropdown");
+  await subject.expand();
+  await subject.selectRowByValue("share-and-invite");
+
+  assert.notOk(
+    find(".share-and-invite.modal .modal-panel.share .topic-share-url")
+      .val()
+      .includes("?u=eviltrout"),
+    "it doesn't add the username param when badges are disabled"
+  );
+});