v1.0.8

src/lib/logoCache.ts

@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+import { getApiBaseUrl } from '@/services/api';
+
+export type LogoState = { status: 'loading' } | { status: 'custom'; url: string } | { status: 'default' };
+
+let state: LogoState = { status: 'loading' };
+let started = false;
+const listeners = new Set<() => void>();
+
+export function getLogoState(): LogoState {
+  return state;
+}
+
+export function subscribeToLogo(listener: () => void): () => void {
+  listeners.add(listener);
+  return () => {
+    listeners.delete(listener);
+  };
+}
+
+export function loadLogoOnce(): void {
+  if (started) return;
+  started = true;
+  fetch(`${getApiBaseUrl()}/logo`)
+    .then(async (response) => {
+      const contentType = response.headers.get('content-type') ?? '';
+      if (!response.ok || !contentType.startsWith('image/')) return null;
+      return URL.createObjectURL(await response.blob());
+    })
+    .catch(() => null)
+    .then((url) => {
+      state = url ? { status: 'custom', url } : { status: 'default' };
+      listeners.forEach((notify) => notify());
+    });
+}