add attachment download event handler (baseline)

Author: martgil

extension/js/common/browser/browser-msg.ts

@@ -98,6 +98,7 @@ export namespace Bm {
   export type PgpBlockRetry = { frameId: string; messageSender: Dest };
   export type PgpBlockReady = { frameId: string; messageSender: Dest };
   export type ThunderbirdOpenPassphraseDialog = { acctEmail: string; longids: string };
+  export type ThunderbirdAttachmentDownload = { attachment: messenger.messages.MessageAttachment };
 
   export namespace Res {
     export type GetActiveTabInfo = {
@@ -114,7 +115,7 @@ export namespace Bm {
     export type ExpirationCacheGet<V> = Promise<V | undefined>;
     export type ExpirationCacheSet = Promise<void>;
     export type ExpirationCacheDeleteExpired = Promise<void>;
-    export type ThunderbirdGetActiveTabInfo = number | undefined;
+    export type ThunderbirdAttachmentDownload = Promise<void>;
     export type ThunderbirdGetCurrentUser = string | undefined;
     export type ThunderbirdMsgGet = { attachments: messenger.messages.MessageAttachment[]; messagePart: messenger.messages.MessagePart };
     export type ThunderbirdOpenPassphraseDialog = Promise<void>;
@@ -135,7 +136,7 @@ export namespace Bm {
       | ExpirationCacheDeleteExpired
       | AjaxGmailAttachmentGetChunk
       | ConfirmationResult
-      | ThunderbirdGetActiveTabInfo
+      | ThunderbirdAttachmentDownload
       | ThunderbirdMsgGet;
   }
 
@@ -177,6 +178,7 @@ export namespace Bm {
     | PgpBlockReady
     | PgpBlockRetry
     | ConfirmationResult
+    | ThunderbirdAttachmentDownload
     | ThunderbirdOpenPassphraseDialog
     | Ajax;
 
@@ -241,8 +243,8 @@ export class BrowserMsg {
           BrowserMsg.sendAwait(undefined, 'expirationCacheSet', bm, true) as Promise<Bm.Res.ExpirationCacheSet>,
         expirationCacheDeleteExpired: (bm: Bm.ExpirationCacheDeleteExpired) =>
           BrowserMsg.sendAwait(undefined, 'expirationCacheDeleteExpired', bm, true) as Promise<Bm.Res.ExpirationCacheDeleteExpired>,
-        thunderbirdGetActiveTabInfo: () =>
-          BrowserMsg.sendAwait(undefined, 'thunderbirdGetActiveTabInfo', undefined, true) as Promise<Bm.Res.ThunderbirdGetActiveTabInfo>,
+        thunderbirdAttachmentDownload: (bm: Bm.ThunderbirdAttachmentDownload) =>
+          BrowserMsg.sendAwait(undefined, 'thunderbirdAttachmentDownload', bm, true) as Promise<Bm.Res.ThunderbirdAttachmentDownload>,
         thunderbirdGetCurrentUser: () =>
           BrowserMsg.sendAwait(undefined, 'thunderbirdGetCurrentUser', undefined, true) as Promise<Bm.Res.ThunderbirdGetCurrentUser>,
         thunderbirdMsgGet: () => BrowserMsg.sendAwait(undefined, 'thunderbirdMsgGet', undefined, true) as Promise<Bm.Res.ThunderbirdMsgGet>,

extension/js/content_scripts/webmail/thunderbird/thunderbird-element-replacer.ts

@@ -129,9 +129,7 @@ export class ThunderbirdElementReplacer extends WebmailElementReplacer {
   };
 
   private downloadThunderbirdAttachmentHandler = async (attachment: messenger.messages.MessageAttachment) => {
-    console.log('debug:', attachment);
-    const messageId = await BrowserMsg.send.bg.await.thunderbirdGetActiveTabInfo();
-    console.log(messageId);
+    await BrowserMsg.send.bg.await.thunderbirdAttachmentDownload({ attachment });
   };
 
   private isCleartextMsg = (): boolean => {

extension/js/service_worker/background.ts

@@ -73,9 +73,9 @@ console.info('background.js service worker starting');
   if (Catch.isThunderbirdMail()) {
     BgHandlers.thunderbirdSecureComposeHandler();
     await BgHandlers.thunderbirdContentScriptRegistration();
-    BrowserMsg.bgAddListener('thunderbirdGetActiveTabInfo', BgHandlers.thunderbirdGetActiveTabInfo);
     BrowserMsg.bgAddListener('thunderbirdGetCurrentUser', BgHandlers.thunderbirdGetCurrentUserHandler);
     BrowserMsg.bgAddListener('thunderbirdMsgGet', BgHandlers.thunderbirdMsgGetHandler);
+    BrowserMsg.bgAddListener('thunderbirdAttachmentDownload', BgHandlers.thunderbirdAttachmentDownload);
     BrowserMsg.bgAddListener('thunderbirdOpenPassphraseDialog', BgHandlers.thunderbirdOpenPassphraseDialog);
   }
 })().catch(Catch.reportErr);

extension/js/service_worker/bg-handlers.ts

@@ -162,9 +162,18 @@ export class BgHandlers {
     });
   };
 
-  public static thunderbirdGetActiveTabInfo = async (): Promise<Bm.Res.ThunderbirdGetActiveTabInfo> => {
-    const tabs = await messenger.tabs.query({ active: true, currentWindow: true });
-    return tabs[0].id;
+  public static thunderbirdAttachmentDownload = async (r: Bm.ThunderbirdAttachmentDownload): Promise<Bm.Res.ThunderbirdAttachmentDownload> => {
+    const [tab] = await messenger.mailTabs.query({ active: true, currentWindow: true });
+    if (tab.id) {
+      const downloadableAttachment = await messenger.messages.getAttachmentFile(tab.id, r.attachment.partName);
+      const fileUrl = URL.createObjectURL(downloadableAttachment);
+      await browser.downloads.download({
+        url: fileUrl,
+        filename: r.attachment.name,
+        saveAs: true,
+      });
+      URL.revokeObjectURL(fileUrl);
+    }
   };
 
   public static thunderbirdGetCurrentUserHandler = async (): Promise<Bm.Res.ThunderbirdGetCurrentUser> => {