FEATURE: Add <RouteControl> component

app/assets/javascripts/discourse/app/components/route-control.hbs

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+{{#if this.canDisplay}}
+  {{yield}}
+{{/if}}

app/assets/javascripts/discourse/app/components/route-control.js

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+import Component from "@glimmer/component";
+import { inject as service } from "@ember/service";
+import { defaultHomepage } from "discourse/lib/utilities";
+
+export default class RouteControl extends Component {
+  @service router;
+  @service siteSettings;
+  @service currentUser;
+
+  get canDisplay() {
+    const currentRouteName = this.router.currentRouteName;
+    const showOn = this.args.showOn;
+    const minTrustLevel = this.args.options?.minTrustLevel;
+    const requireUser = this.args.options?.requireUser
+      ? this.args.options?.requireUser
+      : false;
+
+    if (requireUser && !this.currentUser) {
+      return;
+    }
+
+    if (
+      (minTrustLevel && this.currentUser?.trust_level < minTrustLevel) ||
+      (minTrustLevel && !this.currentUser)
+    ) {
+      return;
+    }
+
+    if (showOn === "homepage") {
+      return this.#handleHomepageRoute(currentRouteName);
+    } else if (showOn === currentRouteName) {
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+  #handleHomepageRoute(currentRouteName) {
+    const topMenu = this.siteSettings.top_menu;
+
+    if (currentRouteName === `discovery.${defaultHomepage()}`) {
+      return true;
+    } else if (
+      topMenu.split("|").any((m) => `discovery.${m}` === currentRouteName)
+    ) {
+      return true;
+    } else {
+      return false;
+    }
+  }
+}

app/assets/javascripts/discourse/tests/acceptance/route-control-test.js

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+import {
+  acceptance,
+  exists,
+  updateCurrentUser,
+} from "discourse/tests/helpers/qunit-helpers";
+import { visit } from "@ember/test-helpers";
+import { test } from "qunit";
+import { extraConnectorClass } from "discourse/lib/plugin-connectors";
+import { hbs } from "ember-cli-htmlbars";
+
+const PREFIX = "javascripts/single-test/connectors";
+
+acceptance("Route Control (as visitor)", function (needs) {
+  needs.settings({
+    top_menu: "latest|categories|top|bookmarks",
+  });
+  needs.hooks.beforeEach(() => {
+    extraConnectorClass("below-site-header/hello");
+
+    // eslint-disable-next-line no-undef
+    Ember.TEMPLATES[`${PREFIX}/below-site-header/hello`] = hbs`
+    <RouteControl @showOn="discovery.categories">
+      <h1 id="only-category-page">This should only show on the category page</h1>
+    </RouteControl>
+    <RouteControl @showOn="homepage">
+      <h1 id="only-homepage">This should only show on the homepage</h1>
+    </RouteControl>
+    <RouteControl @showOn="discovery.latest" @options={{hash requireUser=true}}>
+      <h1 id="only-users">Only users can see this</h1>
+    </RouteControl>`;
+  });
+
+  test("Category content only shows on category page", async function (assert) {
+    await visit("/categories");
+    assert.ok(
+      exists(
+        "#only-category-page",
+        "The content is shown on the category page."
+      )
+    );
+    await visit("/latest");
+    assert.ok(
+      !exists(
+        "#only-category-page",
+        "The content is not shown on the latest page."
+      )
+    );
+  });
+
+  test("Homepage Content only shows on all homepage routes", async function (assert) {
+    await visit("/");
+    assert.ok(
+      exists("#only-homepage", "The content is shown on the homepage.")
+    );
+
+    await visit("/categories");
+    assert.ok(
+      exists("#only-homepage", "The content is shown on a homepage route.")
+    );
+
+    await visit("/t/internationalization-localization/280");
+    assert.ok(
+      !exists(
+        "#only-homepage",
+        "The content is not shown on the categories page."
+      )
+    );
+  });
+
+  test("User only content doesn't show for visitors", async function (assert) {
+    await visit("/latest");
+    assert.ok(!exists("#only-users"), "The content is not shown for visitors.");
+  });
+});
+
+acceptance("Route Control (as user)", function (needs) {
+  needs.user();
+  needs.settings({
+    top_menu: "latest|categories|top|bookmarks",
+  });
+  needs.hooks.beforeEach(() => {
+    extraConnectorClass("below-site-header/hello");
+
+    // eslint-disable-next-line no-undef
+    Ember.TEMPLATES[`${PREFIX}/below-site-header/hello`] = hbs`
+    <RouteControl @showOn="discovery.latest" @options={{hash requireUser=true}}>
+      <h1 id="only-users">Only users can see this</h1>
+    </RouteControl>
+    <RouteControl @showOn="homepage" @options={{hash minTrustLevel=3 }}>
+     <h1 id="only-trust-level">This should only show for 3 or above trust level</h1>
+    </RouteControl>
+`;
+  });
+
+  test("User only content shows for users", async function (assert) {
+    await visit("/latest");
+    assert.ok(exists("#only-users"), "The content is visible for users.");
+  });
+
+  test("Content shows for trust level 3 user", async function (assert) {
+    await visit("/");
+    assert.ok(
+      exists("#only-trust-level"),
+      "The content is visible for adequate trust level user."
+    );
+  });
+
+  test("Content doesn't show for trust level 2 user", async function (assert) {
+    updateCurrentUser({ trust_level: 2 });
+    await visit("/");
+
+    assert.ok(
+      !exists("#only-trust-level"),
+      "The content is not shown for low trust level user."
+    );
+  });
+});