feat(upload): Add function to download files (#89)

plugins/upload/guest-js/index.ts

@@ -11,12 +11,12 @@ type ProgressHandler = (progress: number, total: number) => void;
 const handlers: Map<number, ProgressHandler> = new Map();
 let listening = false;
 
-async function listenToUploadEventIfNeeded(): Promise<void> {
+async function listenToEventIfNeeded(event: string): Promise<void> {
   if (listening) {
     return await Promise.resolve();
   }
   return await appWindow
-    .listen<ProgressPayload>("upload://progress", ({ payload }) => {
+    .listen<ProgressPayload>(event, ({ payload }) => {
       const handler = handlers.get(payload.id);
       if (handler != null) {
         handler(payload.progress, payload.total);
@@ -27,7 +27,7 @@ async function listenToUploadEventIfNeeded(): Promise<void> {
     });
 }
 
-export default async function upload(
+async function upload(
   url: string,
   filePath: string,
   progressHandler?: ProgressHandler,
@@ -41,7 +41,7 @@ export default async function upload(
     handlers.set(id, progressHandler);
   }
 
-  await listenToUploadEventIfNeeded();
+  await listenToEventIfNeeded("upload://progress");
 
   await invoke("plugin:upload|upload", {
     id,
@@ -50,3 +50,30 @@ export default async function upload(
     headers: headers ?? {},
   });
 }
+
+async function download(
+  url: string,
+  filePath: string,
+  progressHandler?: ProgressHandler,
+  headers?: Map<string, string>
+): Promise<void> {
+  const ids = new Uint32Array(1);
+  window.crypto.getRandomValues(ids);
+  const id = ids[0];
+
+  if (progressHandler != null) {
+    handlers.set(id, progressHandler);
+  }
+
+  await listenToEventIfNeeded("download://progress");
+
+  await invoke("plugin:upload|upload", {
+    id,
+    url,
+    filePath,
+    headers: headers ?? {},
+  });
+}
+
+export default upload;
+export { download, upload };