refactor(backend): config validation joi to zod

Co-authored-by: Philip Molares <philip.molares@udo.edu>
Signed-off-by: Philip Molares <philip.molares@udo.edu>
Signed-off-by: Erik Michelson <github@erik.michelson.eu>

backend/src/config/customization.config.spec.ts

@@ -0,0 +1,68 @@
+/*
+ * SPDX-FileCopyrightText: 2025 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import mockedEnv from 'mocked-env';
+
+import customizationConfig from './customization.config';
+
+describe('customizationConfig', () => {
+  const customName = 'test name';
+  const customLogo = 'https://example.com/logo.png';
+  const privacyUrl = 'https://privacy.example.com';
+  const termsOfUseUrl = 'https://termsOfUse.example.com';
+  const imprintUrl = 'https://imprint.example.com';
+  const invalidCustomLogo = 'example.com/logo.png';
+  const invalidPrivacyUrl = 'privacy.example.com';
+  const invalidTermsOfUseUrl = 'termsOfUse.example.com';
+  const invalidImprintUrl = 'imprint.example.com';
+
+  it('correctly parses valid config', () => {
+    const restore = mockedEnv(
+      {
+        /* eslint-disable @typescript-eslint/naming-convention */
+        HD_CUSTOM_NAME: customName,
+        HD_CUSTOM_LOGO: customLogo,
+        HD_PRIVACY_URL: privacyUrl,
+        HD_TERMS_OF_USE_URL: termsOfUseUrl,
+        HD_IMPRINT_URL: imprintUrl,
+        /* eslint-enable @typescript-eslint/naming-convention */
+      },
+      {
+        clear: true,
+      },
+    );
+    const config = customizationConfig();
+    expect(config.branding.customName).toEqual(customName);
+    expect(config.branding.customLogo).toEqual(customLogo);
+    expect(config.specialUrls.privacy).toEqual(privacyUrl);
+    expect(config.specialUrls.termsOfUse).toEqual(termsOfUseUrl);
+    expect(config.specialUrls.imprint).toEqual(imprintUrl);
+    restore();
+  });
+
+  it('throws an error if anything is wrongly configured', () => {
+    const restore = mockedEnv(
+      {
+        /* eslint-disable @typescript-eslint/naming-convention */
+        HD_CUSTOM_NAME: customName,
+        HD_CUSTOM_LOGO: invalidCustomLogo,
+        HD_PRIVACY_URL: invalidPrivacyUrl,
+        HD_TERMS_OF_USE_URL: invalidTermsOfUseUrl,
+        HD_IMPRINT_URL: invalidImprintUrl,
+        /* eslint-enable @typescript-eslint/naming-convention */
+      },
+      {
+        clear: true,
+      },
+    );
+    expect(() => customizationConfig()).toThrow(
+      `- HD_BRANDING_CUSTOM_LOGO: Invalid url
+ - HD_SPECIAL_URLS_PRIVACY: Invalid url
+ - HD_SPECIAL_URLS_TERMS_OF_USE: Invalid url
+ - HD_SPECIAL_URLS_IMPRINT: Invalid url`,
+    );
+    restore();
+  });
+});