Allow downloading multiple images into one directory

Co-authored-by: Major-Mayer <lrdarknesss@yahoo.de>

_locales/de/messages.json

@@ -791,9 +791,15 @@
   "icu:attachmentSaved": {
     "messageformat": "Anhang gespeichert."
   },
+  "icu:attachmentSavedPlural": {
+    "messageformat": "{count, plural, one {Anhang} other {# Anhänge}} gespeichert."
+  },
   "icu:attachmentSavedShow": {
     "messageformat": "Im Ordner anzeigen"
   },
+  "icu:attachmentStillDownloading": {
+    "messageformat": "{count, plural, one {Anhang kann} other {Anhänge können}} nicht gespeichert werden, da {count, plural, one {er} other {#}} noch nicht fertig heruntergeladen {count, plural, one {wurde} other {wurden}}."
+  },
   "icu:you": {
     "messageformat": "Du"
   },

_locales/en/messages.json

@@ -1066,10 +1066,18 @@
     "messageformat": "Attachment saved.",
     "description": "Shown after user selects to save to downloads"
   },
+  "icu:attachmentSavedPlural": {
+    "messageformat": "{count, plural, one {Attachment} other {# attachments}} saved",
+    "description": "Shown after user selects to save to downloads"
+  },
   "icu:attachmentSavedShow": {
     "messageformat": "Show in folder",
     "description": "Button label for showing the attachment in your file system"
   },
+  "icu:attachmentStillDownloading": {
+    "messageformat": "Can't save {count, plural, one {attachment, since it hasn't} other {attachments, since # haven't}} finished downloading yet",
+    "description": "Shown when the user tries to save an attachment to the filesystem, but it's impossible since the download from servers hasn't finished yet"
+  },
   "icu:you": {
     "messageformat": "You",
     "description": "Shown when the user represented is the current user."

app/main.ts

@@ -3032,6 +3032,32 @@ ipc.handle('show-save-dialog', async (_event, { defaultPath }) => {
   return { canceled: false, filePath: finalFilePath };
 });
 
+ipc.handle('show-save-multi-dialog', async _event => {
+  if (!mainWindow) {
+    getLogger().warn('show-save-multi-dialog: no main window');
+
+    return { canceled: true };
+  }
+  const { canceled, filePaths: selectedDirPaths } = await dialog.showOpenDialog(
+    mainWindow,
+    {
+      defaultPath: app.getPath('downloads'),
+      properties: ['openDirectory', 'createDirectory'],
+    }
+  );
+  if (canceled || selectedDirPaths.length === 0) {
+    return { canceled: true };
+  }
+
+  if (selectedDirPaths.length > 1) {
+    getLogger().warn('show-save-multi-dialog: multiple directories selected');
+
+    return { canceled: true };
+  }
+
+  return { canceled: false, dirPath: selectedDirPaths[0] };
+});
+
 ipc.handle('executeMenuRole', async ({ sender }, untypedRole) => {
   const role = untypedRole as MenuItemConstructorOptions['role'];
 

ts/components/EditHistoryMessagesModal.tsx

@@ -55,6 +55,7 @@ const MESSAGE_DEFAULT_PROPS = {
   renderAudioAttachment: () => <div />,
   renderingContext: 'EditHistoryMessagesModal',
   saveAttachment: shouldNeverBeCalled,
+  saveAttachments: shouldNeverBeCalled,
   scrollToQuotedMessage: shouldNeverBeCalled,
   shouldCollapseAbove: false,
   shouldCollapseBelow: false,
@@ -62,6 +63,7 @@ const MESSAGE_DEFAULT_PROPS = {
   showContactModal: shouldNeverBeCalled,
   showConversation: noop,
   showEditHistoryModal: noop,
+  showAttachmentDownloadStillInProgressToast: shouldNeverBeCalled,
   showExpiredIncomingTapToViewToast: shouldNeverBeCalled,
   showExpiredOutgoingTapToViewToast: shouldNeverBeCalled,
   showLightboxForViewOnceMedia: shouldNeverBeCalled,

ts/components/StoryViewsNRepliesModal.tsx

@@ -64,8 +64,10 @@ const MESSAGE_DEFAULT_PROPS = {
   pushPanelForConversation: shouldNeverBeCalled,
   renderAudioAttachment: () => <div />,
   saveAttachment: shouldNeverBeCalled,
+  saveAttachments: shouldNeverBeCalled,
   scrollToQuotedMessage: shouldNeverBeCalled,
   showConversation: noop,
+  showAttachmentDownloadStillInProgressToast: shouldNeverBeCalled,
   showExpiredIncomingTapToViewToast: shouldNeverBeCalled,
   showExpiredOutgoingTapToViewToast: shouldNeverBeCalled,
   showLightbox: shouldNeverBeCalled,

ts/components/ToastManager.stories.tsx

@@ -27,6 +27,13 @@ function getToast(toastType: ToastType): AnyToast {
       return { toastType: ToastType.AlreadyGroupMember };
     case ToastType.AlreadyRequestedToJoin:
       return { toastType: ToastType.AlreadyRequestedToJoin };
+    case ToastType.AttachmentDownloadStillInProgress:
+      return {
+        toastType: ToastType.AttachmentDownloadStillInProgress,
+        parameters: {
+          count: 1,
+        },
+      };
     case ToastType.Blocked:
       return { toastType: ToastType.Blocked };
     case ToastType.BlockedGroup:

ts/components/ToastManager.tsx

@@ -88,6 +88,16 @@ export function renderToast({
     );
   }
 
+  if (toastType === ToastType.AttachmentDownloadStillInProgress) {
+    return (
+      <Toast onClose={hideToast}>
+        {i18n('icu:attachmentStillDownloading', {
+          count: toast.parameters.count,
+        })}
+      </Toast>
+    );
+  }
+
   if (toastType === ToastType.Blocked) {
     return <Toast onClose={hideToast}>{i18n('icu:unblockToSend')}</Toast>;
   }
@@ -310,7 +320,9 @@ export function renderToast({
           },
         }}
       >
-        {i18n('icu:attachmentSaved')}
+        {i18n('icu:attachmentSavedPlural', {
+          count: toast.parameters.countOfFiles ?? 1,
+        })}
       </Toast>
     );
   }

ts/components/conversation/Message.tsx

@@ -24,6 +24,7 @@ import type {
   InteractionModeType,
   PushPanelForConversationActionType,
   SaveAttachmentActionCreatorType,
+  SaveAttachmentsActionCreatorType,
   ShowConversationType,
 } from '../../state/ducks/conversations';
 import type { ViewStoryActionCreatorType } from '../../state/ducks/stories';
@@ -352,6 +353,7 @@ export type PropsActions = {
     messageId: string;
   }) => void;
   saveAttachment: SaveAttachmentActionCreatorType;
+  saveAttachments: SaveAttachmentsActionCreatorType;
   showLightbox: (options: {
     attachment: AttachmentType;
     messageId: string;
@@ -366,6 +368,7 @@ export type PropsActions = {
   targetMessage?: (messageId: string, conversationId: string) => unknown;
 
   showEditHistoryModal?: (id: string) => unknown;
+  showAttachmentDownloadStillInProgressToast: (count: number) => unknown;
   showExpiredIncomingTapToViewToast: () => unknown;
   showExpiredOutgoingTapToViewToast: () => unknown;
   viewStory: ViewStoryActionCreatorType;

ts/components/conversation/MessageDetail.tsx

@@ -95,9 +95,11 @@ export type PropsReduxActions = Pick<
   | 'pushPanelForConversation'
   | 'retryMessageSend'
   | 'saveAttachment'
+  | 'saveAttachments'
   | 'showContactModal'
   | 'showConversation'
   | 'showEditHistoryModal'
+  | 'showAttachmentDownloadStillInProgressToast'
   | 'showExpiredIncomingTapToViewToast'
   | 'showExpiredOutgoingTapToViewToast'
   | 'showLightbox'
@@ -139,9 +141,11 @@ export function MessageDetail({
   retryMessageSend,
   renderAudioAttachment,
   saveAttachment,
+  saveAttachments,
   showContactModal,
   showConversation,
   showEditHistoryModal,
+  showAttachmentDownloadStillInProgressToast,
   showExpiredIncomingTapToViewToast,
   showExpiredOutgoingTapToViewToast,
   showLightbox,
@@ -348,6 +352,7 @@ export function MessageDetail({
             retryMessageSend={retryMessageSend}
             renderAudioAttachment={renderAudioAttachment}
             saveAttachment={saveAttachment}
+            saveAttachments={saveAttachments}
             shouldCollapseAbove={false}
             shouldCollapseBelow={false}
             shouldHideMetadata={false}
@@ -357,6 +362,9 @@ export function MessageDetail({
               log.warn('MessageDetail: scrollToQuotedMessage called!');
             }}
             showContactModal={showContactModal}
+            showAttachmentDownloadStillInProgressToast={
+              showAttachmentDownloadStillInProgressToast
+            }
             showExpiredIncomingTapToViewToast={
               showExpiredIncomingTapToViewToast
             }

ts/components/conversation/Quote.stories.tsx

@@ -125,6 +125,7 @@ const defaultMessageProps: TimelineMessagesProps = {
   copyMessageText: action('copyMessageText'),
   retryDeleteForEveryone: action('default--retryDeleteForEveryone'),
   saveAttachment: action('saveAttachment'),
+  saveAttachments: action('saveAttachments'),
   scrollToQuotedMessage: action('default--scrollToQuotedMessage'),
   targetMessage: action('default--targetMessage'),
   shouldCollapseAbove: false,
@@ -133,6 +134,9 @@ const defaultMessageProps: TimelineMessagesProps = {
   showSpoiler: action('showSpoiler'),
   pushPanelForConversation: action('default--pushPanelForConversation'),
   showContactModal: action('default--showContactModal'),
+  showAttachmentDownloadStillInProgressToast: action(
+    'showAttachmentDownloadStillInProgressToast'
+  ),
   showExpiredIncomingTapToViewToast: action(
     'showExpiredIncomingTapToViewToast'
   ),

ts/components/conversation/Timeline.stories.tsx

@@ -291,6 +291,7 @@ const actions = () => ({
   retryDeleteForEveryone: action('retryDeleteForEveryone'),
   retryMessageSend: action('retryMessageSend'),
   saveAttachment: action('saveAttachment'),
+  saveAttachments: action('saveAttachments'),
   pushPanelForConversation: action('pushPanelForConversation'),
   showContactDetail: action('showContactDetail'),
   showContactModal: action('showContactModal'),
@@ -305,6 +306,9 @@ const actions = () => ({
 
   openGiftBadge: action('openGiftBadge'),
   scrollToQuotedMessage: action('scrollToQuotedMessage'),
+  showAttachmentDownloadStillInProgressToast: action(
+    'showAttachmentDownloadStillInProgressToast'
+  ),
   showExpiredIncomingTapToViewToast: action(
     'showExpiredIncomingTapToViewToast'
   ),

ts/components/conversation/TimelineItem.stories.tsx

@@ -82,6 +82,7 @@ const getDefaultProps = () => ({
   showConversation: action('showConversation'),
   openGiftBadge: action('openGiftBadge'),
   saveAttachment: action('saveAttachment'),
+  saveAttachments: action('saveAttachments'),
   onOpenEditNicknameAndNoteModal: action('onOpenEditNicknameAndNoteModal'),
   onOutgoingAudioCallInConversation: action(
     'onOutgoingAudioCallInConversation'
@@ -96,6 +97,9 @@ const getDefaultProps = () => ({
   toggleForwardMessagesModal: action('toggleForwardMessagesModal'),
   showLightboxForViewOnceMedia: action('showLightboxForViewOnceMedia'),
   doubleCheckMissingQuoteReference: action('doubleCheckMissingQuoteReference'),
+  showAttachmentDownloadStillInProgressToast: action(
+    'showAttachmentDownloadStillInProgressToast'
+  ),
   showExpiredIncomingTapToViewToast: action(
     'showExpiredIncomingTapToViewToast'
   ),

ts/components/conversation/TimelineMessage.stories.tsx

@@ -317,6 +317,7 @@ const createProps = (overrideProps: Partial<Props> = {}): Props => ({
   renderReactionPicker,
   renderAudioAttachment,
   saveAttachment: action('saveAttachment'),
+  saveAttachments: action('saveAttachments'),
   setQuoteByMessageId: action('setQuoteByMessageId'),
   retryMessageSend: action('retryMessageSend'),
   copyMessageText: action('copyMessageText'),
@@ -340,6 +341,9 @@ const createProps = (overrideProps: Partial<Props> = {}): Props => ({
   showSpoiler: action('showSpoiler'),
   pushPanelForConversation: action('pushPanelForConversation'),
   showContactModal: action('showContactModal'),
+  showAttachmentDownloadStillInProgressToast: action(
+    'showAttachmentDownloadStillInProgressToast'
+  ),
   showExpiredIncomingTapToViewToast: action(
     'showExpiredIncomingTapToViewToast'
   ),

ts/components/conversation/TimelineMessage.tsx

@@ -121,6 +121,8 @@ export function TimelineMessage(props: Props): JSX.Element {
     retryDeleteForEveryone,
     retryMessageSend,
     saveAttachment,
+    saveAttachments,
+    showAttachmentDownloadStillInProgressToast,
     selectedReaction,
     setQuoteByMessageId,
     setMessageToEdit,
@@ -212,22 +214,42 @@ export function TimelineMessage(props: Props): JSX.Element {
         event.stopPropagation();
       }
 
-      if (!attachments || attachments.length !== 1) {
+      if (!attachments || attachments.length === 0) {
         return;
       }
 
-      const attachment = attachments[0];
-      if (!isDownloaded(attachment)) {
-        kickOffAttachmentDownload({
-          attachment,
-          messageId: id,
-        });
-        return;
+      let attachmentsInProgress = 0;
+      // check if any attachment needs to be downloaded from servers
+      for (const attachment of attachments) {
+        if (!isDownloaded(attachment)) {
+          kickOffAttachmentDownload({
+            attachment,
+            messageId: id,
+          });
+
+          attachmentsInProgress += 1;
+        }
       }
 
-      saveAttachment(attachment, timestamp);
+      if (attachmentsInProgress !== 0) {
+        showAttachmentDownloadStillInProgressToast(attachmentsInProgress);
+      }
+
+      if (attachments.length !== 1) {
+        saveAttachments(attachments, timestamp);
+      } else {
+        saveAttachment(attachments[0], timestamp);
+      }
     },
-    [kickOffAttachmentDownload, saveAttachment, attachments, id, timestamp]
+    [
+      kickOffAttachmentDownload,
+      saveAttachments,
+      saveAttachment,
+      showAttachmentDownloadStillInProgressToast,
+      attachments,
+      id,
+      timestamp,
+    ]
   );
 
   const handleContextMenu = useHandleMessageContextMenu(menuTriggerRef);
@@ -237,16 +259,13 @@ export function TimelineMessage(props: Props): JSX.Element {
   const shouldShowAdditional =
     doesMessageBodyOverflow(text || '') || !isWindowWidthNotNarrow;
 
-  const multipleAttachments = attachments && attachments.length > 1;
-  const firstAttachment = attachments && attachments[0];
+  const hasPendingAttachments =
+    attachments?.length && attachments.some(attachment => attachment.pending);
 
+  // If any of the conditions is not given -> undefined is returned
+  // --> download menu icon is not rendered
   const handleDownload =
-    canDownload &&
-    !isSticker &&
-    !multipleAttachments &&
-    !isTapToView &&
-    firstAttachment &&
-    !firstAttachment.pending
+    canDownload && !isSticker && !isTapToView && !hasPendingAttachments
       ? openGenericAttachment
       : undefined;
 

ts/signal.ts

@@ -115,6 +115,7 @@ type MigrationsModuleType = {
   saveAttachmentToDisk: (options: {
     data: Uint8Array;
     name: string;
+    baseDir?: string;
   }) => Promise<null | { fullPath: string; name: string }>;
   processNewAttachment: (attachment: AttachmentType) => Promise<AttachmentType>;
   processNewSticker: (stickerData: Uint8Array) => Promise<
@@ -406,9 +407,11 @@ type AttachmentsModuleType = {
   saveAttachmentToDisk: ({
     data,
     name,
+    dirName,
   }: {
     data: Uint8Array;
     name: string;
+    dirName?: string;
   }) => Promise<null | { fullPath: string; name: string }>;
 
   ensureAttachmentIsReencryptable: (

ts/state/ducks/conversations.ts

@@ -15,7 +15,7 @@ import {
 } from 'lodash';
 import type { PhoneNumber } from 'google-libphonenumber';
 
-import { clipboard } from 'electron';
+import { clipboard, ipcRenderer } from 'electron';
 import type { ReadonlyDeep } from 'type-fest';
 import { DataReader, DataWriter } from '../../sql/Client';
 import type { AttachmentType } from '../../types/Attachment';
@@ -1163,6 +1163,7 @@ export const actions = {
   reviewConversationNameCollision,
   revokePendingMembershipsFromGroupV2,
   saveAttachment,
+  saveAttachments,
   saveAttachmentFromMessage,
   saveAvatarToDisk,
   scrollToMessage,
@@ -1189,6 +1190,7 @@ export const actions = {
   setPreJoinConversation,
   setVoiceNotePlaybackRate,
   showArchivedConversations,
+  showAttachmentDownloadStillInProgressToast,
   showChooseGroupMembers,
   showConversation,
   showExpiredIncomingTapToViewToast,
@@ -3862,6 +3864,105 @@ function saveAttachment(
   };
 }
 
+const showSaveMultiDialog = (): Promise<{
+  canceled: boolean;
+  dirPath?: string;
+}> => {
+  return ipcRenderer.invoke('show-save-multi-dialog');
+};
+
+export type SaveAttachmentsActionCreatorType = ReadonlyDeep<
+  (
+    attachments: ReadonlyArray<AttachmentType>,
+    timestamp?: number,
+    index?: number
+  ) => unknown
+>;
+
+function saveAttachments(
+  attachments: ReadonlyArray<AttachmentType>,
+  timestamp = Date.now()
+): ThunkAction<void, RootStateType, unknown, ShowToastActionType> {
+  return async dispatch => {
+    // check if any of the attachments could be dangerous
+    for (const attachment of attachments) {
+      const { fileName = '' } = attachment;
+
+      const isDangerous = isFileDangerous(fileName);
+      if (isDangerous) {
+        dispatch({
+          type: SHOW_TOAST,
+          payload: {
+            toastType: ToastType.DangerousFileType,
+          },
+        });
+        return;
+      }
+    }
+
+    const { canceled, dirPath } = await showSaveMultiDialog();
+    if (canceled || !dirPath) {
+      return;
+    }
+
+    const { readAttachmentData, saveAttachmentToDisk } =
+      window.Signal.Migrations;
+
+    let fullPath;
+    let index = 0;
+    for (const attachment of attachments) {
+      index += 1;
+
+      // eslint-disable-next-line no-await-in-loop
+      const result = await Attachment.save({
+        attachment,
+        index,
+        readAttachmentData,
+        saveAttachmentToDisk,
+        timestamp,
+        baseDir: dirPath,
+      });
+
+      if (fullPath === undefined) {
+        fullPath = result;
+      }
+    }
+
+    if (fullPath == null) {
+      throw new Error('saveAttachments: Returned path to attachment is null!');
+    }
+
+    dispatch({
+      type: SHOW_TOAST,
+      payload: {
+        toastType: ToastType.FileSaved,
+        parameters: {
+          countOfFiles: attachments.length,
+          fullPath,
+        },
+      },
+    });
+  };
+}
+
+function showAttachmentDownloadStillInProgressToast(
+  count: number
+): ShowToastActionType {
+  log.info(
+    `showAttachmentDownloadStillInProgressToast: ${count} still-pending attachments`
+  );
+  return {
+    type: SHOW_TOAST,
+    payload: {
+      toastType: ToastType.AttachmentDownloadStillInProgress,
+      parameters: {
+        count,
+      },
+    },
+  };
+}
+
+// is only used by lightbox/ gallery
 export function saveAttachmentFromMessage(
   messageId: string,
   providedAttachment?: AttachmentType

ts/state/smart/MessageDetail.tsx

@@ -49,7 +49,9 @@ export const SmartMessageDetail = memo(
       popPanelForConversation,
       pushPanelForConversation,
       saveAttachment,
+      saveAttachments,
       showConversation,
+      showAttachmentDownloadStillInProgressToast,
       showExpiredIncomingTapToViewToast,
       showExpiredOutgoingTapToViewToast,
       showSpoiler,
@@ -99,10 +101,14 @@ export const SmartMessageDetail = memo(
         receivedAt={receivedAt}
         renderAudioAttachment={renderAudioAttachment}
         saveAttachment={saveAttachment}
+        saveAttachments={saveAttachments}
         sentAt={message.timestamp}
         showContactModal={showContactModal}
         showConversation={showConversation}
         showEditHistoryModal={showEditHistoryModal}
+        showAttachmentDownloadStillInProgressToast={
+          showAttachmentDownloadStillInProgressToast
+        }
         showExpiredIncomingTapToViewToast={showExpiredIncomingTapToViewToast}
         showExpiredOutgoingTapToViewToast={showExpiredOutgoingTapToViewToast}
         showLightbox={showLightbox}

ts/state/smart/TimelineItem.tsx

@@ -126,10 +126,12 @@ export const SmartTimelineItem = memo(function SmartTimelineItem(
     retryDeleteForEveryone,
     retryMessageSend,
     saveAttachment,
+    saveAttachments,
     targetMessage,
     toggleSelectMessage,
     setMessageToEdit,
     showConversation,
+    showAttachmentDownloadStillInProgressToast,
     showExpiredIncomingTapToViewToast,
     showExpiredOutgoingTapToViewToast,
     showSpoiler,
@@ -218,12 +220,16 @@ export const SmartTimelineItem = memo(function SmartTimelineItem(
       retryMessageSend={retryMessageSend}
       returnToActiveCall={returnToActiveCall}
       saveAttachment={saveAttachment}
+      saveAttachments={saveAttachments}
       scrollToQuotedMessage={scrollToQuotedMessage}
       targetMessage={targetMessage}
       setQuoteByMessageId={setQuoteByMessageId}
       setMessageToEdit={setMessageToEdit}
       showContactModal={showContactModal}
       showConversation={showConversation}
+      showAttachmentDownloadStillInProgressToast={
+        showAttachmentDownloadStillInProgressToast
+      }
       showExpiredIncomingTapToViewToast={showExpiredIncomingTapToViewToast}
       showExpiredOutgoingTapToViewToast={showExpiredOutgoingTapToViewToast}
       showLightbox={showLightbox}

ts/types/Attachment.ts

@@ -983,6 +983,7 @@ export const save = async ({
   readAttachmentData,
   saveAttachmentToDisk,
   timestamp,
+  baseDir,
 }: {
   attachment: AttachmentType;
   index?: number;
@@ -992,8 +993,14 @@ export const save = async ({
   saveAttachmentToDisk: (options: {
     data: Uint8Array;
     name: string;
+    baseDir?: string;
   }) => Promise<{ name: string; fullPath: string } | null>;
   timestamp?: number;
+  /**
+   * Base directory for saving the attachment.
+   * If omitted, a dialog will be opened to let the user choose a directory
+   */
+  baseDir?: string;
 }): Promise<string | null> => {
   let data: Uint8Array;
   if (attachment.path) {
@@ -1009,6 +1016,7 @@ export const save = async ({
   const result = await saveAttachmentToDisk({
     data,
     name,
+    baseDir,
   });
 
   if (!result) {

ts/types/Toast.tsx

@@ -6,6 +6,7 @@ export enum ToastType {
   AddedUsersToCall = 'AddedUsersToCall',
   AlreadyGroupMember = 'AlreadyGroupMember',
   AlreadyRequestedToJoin = 'AlreadyRequestedToJoin',
+  AttachmentDownloadStillInProgress = 'AttachmentDownloadStillInProgress',
   Blocked = 'Blocked',
   BlockedGroup = 'BlockedGroup',
   CallHistoryCleared = 'CallHistoryCleared',
@@ -78,6 +79,10 @@ export type AnyToast =
     }
   | { toastType: ToastType.AlreadyGroupMember }
   | { toastType: ToastType.AlreadyRequestedToJoin }
+  | {
+      toastType: ToastType.AttachmentDownloadStillInProgress;
+      parameters: { count: number };
+    }
   | { toastType: ToastType.Blocked }
   | { toastType: ToastType.BlockedGroup }
   | { toastType: ToastType.CallHistoryCleared }
@@ -108,7 +113,10 @@ export type AnyToast =
   | { toastType: ToastType.FailedToFetchPhoneNumber }
   | { toastType: ToastType.FailedToFetchUsername }
   | { toastType: ToastType.FailedToSendWithEndorsements }
-  | { toastType: ToastType.FileSaved; parameters: { fullPath: string } }
+  | {
+      toastType: ToastType.FileSaved;
+      parameters: { fullPath: string; countOfFiles?: number };
+    }
   | {
       toastType: ToastType.FileSize;
       parameters: { limit: number; units: string };

ts/windows/attachments.ts

@@ -231,14 +231,31 @@ async function writeWithAttributes(
 export const saveAttachmentToDisk = async ({
   data,
   name,
+  baseDir,
 }: {
   data: Uint8Array;
   name: string;
+  /**
+   * Base directory for saving the attachment.
+   * If omitted, a dialog will be opened to let the user choose a directory
+   */
+  baseDir?: string;
 }): Promise<null | { fullPath: string; name: string }> => {
-  const { canceled, filePath } = await showSaveDialog(name);
+  let filePath;
 
-  if (canceled || !filePath) {
-    return null;
+  if (!baseDir) {
+    const { canceled, filePath: dialogFilePath } = await showSaveDialog(name);
+    if (canceled) {
+      return null;
+    }
+    if (!dialogFilePath) {
+      throw new Error(
+        "saveAttachmentToDisk: Dialog wasn't canceled, but returned path to attachment is null!"
+      );
+    }
+    filePath = dialogFilePath;
+  } else {
+    filePath = join(baseDir, name);
   }
 
   await writeWithAttributes(filePath, data);