Fix open group file uploads using incorrect server

js/modules/loki_app_dot_net_api.d.ts

@@ -9,6 +9,11 @@ interface UploadResponse {
   id?: number;
 }
 
+interface DownloadResponse {
+  statucCode: number;
+  reponse: any;
+}
+
 export interface LokiAppDotNetServerInterface {
   findOrCreateChannel(
     api: LokiPublicChatFactoryAPI,
@@ -19,6 +24,7 @@ export interface LokiAppDotNetServerInterface {
   uploadAvatar(data: FormData): Promise<UploadResponse>;
   putAttachment(data: ArrayBuffer): Promise<UploadResponse>;
   putAvatar(data: ArrayBuffer): Promise<UploadResponse>;
+  downloadAttachment(url: String): Promise<DownloadResponse>; // todo: add return type
 }
 
 export interface LokiPublicChannelAPI {

ts/receiver/attachments.ts

@@ -4,7 +4,31 @@ import _ from 'lodash';
 import * as Data from '../../js/modules/data';
 
 export async function downloadAttachment(attachment: any) {
-  const res = await window.lokiFileServerAPI.downloadAttachment(attachment.url);
+  const serverUrl = new URL(attachment.url).origin;
+
+  // The fileserver adds the `-static` part for some reason
+  const defaultFileserver = _.includes(
+    ['https://file-static.lokinet.org', 'https://file.getsession.org'],
+    serverUrl
+  );
+
+  let res: any;
+
+  // TODO: we need attachments to remember which API should be used to retrieve them
+  if (!defaultFileserver) {
+    const serverAPI = await window.lokiPublicChatAPI.findOrCreateServer(
+      serverUrl
+    );
+
+    if (serverAPI) {
+      res = await serverAPI.downloadAttachment(attachment.url);
+    }
+  }
+
+  // Fallback to using the default fileserver
+  if (defaultFileserver || !res) {
+    res = await window.lokiFileServerAPI.downloadAttachment(attachment.url);
+  }
 
   // The attachment id is actually just the absolute url of the attachment
   let data = new Uint8Array(res.response.data).buffer;