Remove precheck.ts, perform check in DittoConf constructor

packages/conf/DittoConf.test.ts

@@ -29,3 +29,26 @@ Deno.test('DittoConfig defaults', async (t) => {
     assertEquals(config.port, 4036);
   });
 });
+
+Deno.test('DittoConfig with insecure media host', () => {
+  const env = new Map<string, string>([
+    ['LOCAL_DOMAIN', 'https://ditto.test'],
+    ['MEDIA_DOMAIN', 'https://ditto.test'],
+  ]);
+
+  assertThrows(
+    () => new DittoConf(env),
+    Error,
+    'For security reasons, MEDIA_DOMAIN cannot be on the same host as LOCAL_DOMAIN',
+  );
+});
+
+Deno.test('DittoConfig with insecure media host and precheck disabled', () => {
+  const env = new Map<string, string>([
+    ['LOCAL_DOMAIN', 'https://ditto.test'],
+    ['MEDIA_DOMAIN', 'https://ditto.test'],
+    ['DITTO_PRECHECK', 'false'],
+  ]);
+
+  new DittoConf(env);
+});

packages/conf/DittoConf.ts

@@ -13,7 +13,17 @@ import { mergeURLPath } from './utils/url.ts';
 
 /** Ditto application-wide configuration. */
 export class DittoConf {
-  constructor(private env: { get(key: string): string | undefined }) {}
+  constructor(private env: { get(key: string): string | undefined }) {
+    if (this.precheck) {
+      const mediaUrl = new URL(this.mediaDomain);
+
+      if (this.url.host === mediaUrl.host) {
+        throw new Error(
+          'For security reasons, MEDIA_DOMAIN cannot be on the same host as LOCAL_DOMAIN.\n\nTo disable this check, set DITTO_PRECHECK="false"',
+        );
+      }
+    }
+  }
 
   /** Cached parsed admin signer. */
   private _signer: NSecSigner | undefined;
@@ -465,4 +475,9 @@ export class DittoConf {
   get streakWindow(): number {
     return Number(this.env.get('STREAK_WINDOW') || 129600);
   }
+
+  /** Whether to perform security/configuration checks on startup. */
+  get precheck(): boolean {
+    return optionalBooleanSchema.parse(this.env.get('DITTO_PRECHECK')) ?? true;
+  }
 }

packages/ditto/precheck.ts

@@ -1,22 +0,0 @@
-import { Conf } from '@/config.ts';
-
-/** Ensure the media URL is not on the same host as the local domain. */
-function checkMediaHost() {
-  const { url, mediaDomain } = Conf;
-  const mediaUrl = new URL(mediaDomain);
-
-  if (url.host === mediaUrl.host) {
-    throw new PrecheckError('For security reasons, MEDIA_DOMAIN cannot be on the same host as LOCAL_DOMAIN.');
-  }
-}
-
-/** Error class for precheck errors. */
-class PrecheckError extends Error {
-  constructor(message: string) {
-    super(`${message}\nTo disable this check, set DITTO_PRECHECK="false"`);
-  }
-}
-
-if (Deno.env.get('DITTO_PRECHECK') !== 'false') {
-  checkMediaHost();
-}

packages/ditto/server.ts

@@ -1,6 +1,5 @@
 import { logi } from '@soapbox/logi';
 
-import '@/precheck.ts';
 import '@/sentry.ts';
 import '@/nostr-wasm.ts';
 import app from '@/app.ts';