fix avatar download on restore when linking device

Fixes  #1601

ts/fileserver/FileServerApiV2.ts

@@ -63,14 +63,22 @@ export const uploadFileToFsV2 = async (
 
 /**
  * Download a file given the fileId from the fileserver v2
- * @param fileId the fileId to download
+ * @param fileIdOrCompleteUrl the fileId to download or the completeUrl to the fileitself
  * @returns the data as an Uint8Array or null
  */
-export const downloadFileFromFSv2 = async (fileId: string): Promise<ArrayBuffer | null> => {
+export const downloadFileFromFSv2 = async (
-  if (!fileId) {
+  fileIdOrCompleteUrl: string
-    window.log.warn('');
+): Promise<ArrayBuffer | null> => {
+  let fileId = fileIdOrCompleteUrl;
+  if (!fileIdOrCompleteUrl) {
+    window.log.warn('Empty url to download for file v2');
     return null;
   }
+
+  const completeUrlPrefix = `${fileServerV2URL}/${FILES_ENDPOINT}/`;
+  if (fileIdOrCompleteUrl.startsWith(completeUrlPrefix)) {
+    fileId = fileId.substr(completeUrlPrefix.length);
+  }
   const request: FileServerV2Request = {
     method: 'GET',
     endpoint: `${FILES_ENDPOINT}/${fileId}`,

ts/receiver/attachments.ts

@@ -14,7 +14,8 @@ import { FSv2 } from '../fileserver';
 import { getUnpaddedAttachment } from '../session/crypto/BufferPadding';
 
 export async function downloadAttachment(attachment: any) {
-  const serverUrl = new URL(attachment.url).origin;
+  const asURL = new URL(attachment.url);
+  const serverUrl = asURL.origin;
 
   // The fileserver adds the `-static` part for some reason
   const defaultFileserver = _.includes(
@@ -27,12 +28,13 @@ export async function downloadAttachment(attachment: any) {
   let res: ArrayBuffer | null = null;
 
   if (defaultFsV2) {
-    if (!attachment.id) {
+    let attachmentId = attachment.id;
-      window.log.warn('Cannot download fsv2 file with empty id');
+    if (!attachmentId) {
-      return;
+      // try to get the fileId from the end of the URL
+      attachmentId = attachment.url;
     }
     window.log.info('Download v2 file server attachment');
-    res = await FSv2.downloadFileFromFSv2(attachment.id);
+    res = await FSv2.downloadFileFromFSv2(attachmentId);
   } else if (!defaultFileserver) {
     // TODO: we need attachments to remember which API should be used to retrieve them
     const serverAPI = await window.lokiPublicChatAPI.findOrCreateServer(serverUrl);