fix: Better check for Upload error type in uploadMedias()

Previous implementation would throw if the received error do not
contain any `errors` array. this can happen if the error is not thrown
by cozy-client

Also this commit improve type check to ensure the receive error is the
one we expect. Casting objects using `as` should be avoided as this
will never ensure type compatibility

src/app/domain/backup/helpers/error.ts

@@ -15,10 +15,20 @@ export class BackupError extends Error {
   }
 }
 
+export const isUploadError = (error: unknown): error is UploadError => {
+  return (
+    typeof error === 'object' &&
+    error !== null &&
+    'statusCode' in error &&
+    'errors' in error &&
+    Array.isArray(error.errors)
+  )
+}
+
 export const isQuotaExceededError = (error: UploadError): boolean => {
   return (
     error.statusCode === 413 &&
-    error.errors[0].detail === 'The file is too big and exceeds the disk quota'
+    error.errors[0]?.detail === 'The file is too big and exceeds the disk quota'
   )
 }
 

src/app/domain/backup/services/uploadMedias.ts

@@ -13,7 +13,7 @@ import {
 } from '/app/domain/backup/models'
 import { UploadError } from '/app/domain/upload/models'
 import { getBackupInfo } from '/app/domain/backup/services/manageBackup'
-import { BackupError, isFatalError } from '/app/domain/backup/helpers/error'
+import { BackupError, isFatalError, isUploadError } from '/app/domain/backup/helpers/error'
 import { areAlbumsEnabled } from '/app/domain/backup/services/manageAlbums'
 
 import type CozyClient from 'cozy-client'
@@ -101,13 +101,15 @@ export const uploadMedias = async (
       await setMediaAsBackuped(client, mediaToUpload, documentCreated)
 
       log.debug(`✅ ${mediaToUpload.name} set as backuped`)
-    } catch (e) {
+    } catch (error) {
       log.debug(
         `❌ ${mediaToUpload.name} not uploaded or set as backuped correctly`
       )
-      log.debug(e)
+      log.debug(error)
 
-      const error = e as UploadError
+      if (!isUploadError(error)) {
+        return
+      }
 
       if (isFatalError(error)) {
         await setBackupAsReady(client)