fix(self-hosting): allow #0000 discriminator in tag change modal (#1193)

Co-authored-by: Hampus <[email protected]>

fluxer_app/src/features/user/utils/FluxerTagDiscriminatorUtils.test.ts

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import {describe, expect, it} from 'vitest';
+import {isVisionaryDiscriminator0000Blocked} from './FluxerTagDiscriminatorUtils';
+
+describe('isVisionaryDiscriminator0000Blocked', () => {
+	it('allows #0000 on self-hosted instances', () => {
+		expect(
+			isVisionaryDiscriminator0000Blocked({
+				showPremium: false,
+				isVisionary: false,
+				discriminator: '0000',
+			}),
+		).toBe(false);
+	});
+
+	it('blocks #0000 for non-visionary users on the main instance', () => {
+		expect(
+			isVisionaryDiscriminator0000Blocked({
+				showPremium: true,
+				isVisionary: false,
+				discriminator: '0000',
+			}),
+		).toBe(true);
+	});
+
+	it('allows #0000 for visionary users on the main instance', () => {
+		expect(
+			isVisionaryDiscriminator0000Blocked({
+				showPremium: true,
+				isVisionary: true,
+				discriminator: '0000',
+			}),
+		).toBe(false);
+	});
+
+	it('allows other discriminators on the main instance', () => {
+		expect(
+			isVisionaryDiscriminator0000Blocked({
+				showPremium: true,
+				isVisionary: false,
+				discriminator: '1337',
+			}),
+		).toBe(false);
+	});
+});

fluxer_app/src/features/user/utils/FluxerTagDiscriminatorUtils.ts

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+export function isVisionaryDiscriminator0000Blocked(options: {
+	showPremium: boolean;
+	isVisionary: boolean;
+	discriminator: string;
+}): boolean {
+	const {showPremium, isVisionary, discriminator} = options;
+	return showPremium && !isVisionary && discriminator === '0000';
+}