feat(userbot,api,frontend): file links, media downloads, story hold-pause, drop scheduled dupes

frontend/src/lib/api/download.ts

@@ -0,0 +1,61 @@
+import { accounts } from "$lib/stores/accounts.svelte";
+import { auth } from "$lib/stores/auth.svelte";
+
+const BASE = import.meta.env.VITE_API_BASE ?? "/api";
+const FILENAME_STAR = /filename\*=UTF-8''([^;]+)/i;
+const FILENAME_PLAIN = /filename="?([^";]+)"?/i;
+
+function nameFromHeader(header: string | null, fallback: string): string {
+  if (!header) {
+    return fallback;
+  }
+  const encoded = FILENAME_STAR.exec(header);
+  if (encoded) {
+    return decodeURIComponent(encoded[1]);
+  }
+  const plain = FILENAME_PLAIN.exec(header);
+  return plain ? plain[1] : fallback;
+}
+
+function saveBlob(blob: Blob, fileName: string) {
+  const url = URL.createObjectURL(blob);
+  const link = document.createElement("a");
+  link.href = url;
+  link.download = fileName;
+  document.body.append(link);
+  link.click();
+  link.remove();
+  setTimeout(() => URL.revokeObjectURL(url), 1000);
+}
+
+async function save(path: string, fallback: string): Promise<void> {
+  const response = await fetch(`${BASE}${path}`, {
+    headers: auth.token ? { Authorization: `Bearer ${auth.token}` } : {},
+  });
+  if (!response.ok) {
+    throw new Error(`download failed: ${response.status}`);
+  }
+  const fileName = nameFromHeader(
+    response.headers.get("content-disposition"),
+    fallback
+  );
+  saveBlob(await response.blob(), fileName);
+}
+
+export function downloadMedia(mediaId: number): Promise<void> {
+  return save(`/media/${mediaId}?download=true`, `media_${mediaId}`);
+}
+
+export function downloadMediaVersion(versionId: number): Promise<void> {
+  return save(
+    `/media/version/${versionId}?download=true`,
+    `media_${versionId}`
+  );
+}
+
+export function downloadStory(peerId: number, storyId: number): Promise<void> {
+  return save(
+    `/stories/${peerId}/${storyId}/media?download=true&account_id=${accounts.selectedId}`,
+    `story_${peerId}_${storyId}`
+  );
+}