Add option to make uploads private

src/.constants.js.example

@@ -9,6 +9,10 @@ module.exports = Object.freeze({
   SUDO_USERS: [012, 345],	// Telegram user IDs. These users can use the bot in any chat.
   AUTHORIZED_CHATS: [678, 901],	// Telegram chat IDs. Anyone in these chats can use the bot.
   STATUS_UPDATE_INTERVAL_MS: 12000, // A smaller number will update faster, but might cause rate limiting
+  DRIVE_FILE_PRIVATE: {
+    enabled: false,
+    email: 'somemail@gmail.com'
+  },
   DOWNLOAD_NOTIFY_TARGET: {  // Information about the web service to notify on download completion.
     enabled: false,   // Set this to true to use the notify functionality
     host: 'hostname.domain',

src/drive/drive-upload.ts

@@ -2,6 +2,7 @@ import driveAuth = require('./drive-auth');
 import driveFile = require('./upload-file');
 import utils = require('./drive-utils');
 import { google, drive_v3 } from 'googleapis';
+import constants = require('../.constants.js');
 
 
 export function uploadFileOrFolder(filePath: string, mime: string, parent: string, size:number, callback: (err: string, id: string) => void) {
@@ -51,14 +52,24 @@ export function getSharableLink(fileId:string, isFolder:boolean, callback: (err:
       return;
     }
     const drive = google.drive({ version: 'v3', auth });
+    var resource;
+    if (constants.DRIVE_FILE_PRIVATE && constants.DRIVE_FILE_PRIVATE.enabled) {
+      resource = {
+        role: 'reader',
+        type: 'user',
+        emailAddress: constants.DRIVE_FILE_PRIVATE.email
+      };
+    } else {
+      resource = {
+        role: 'reader',
+        type: 'anyone'
+      };
+    }
 
     drive.permissions.create({
       fileId: fileId,
       // @ts-ignore Unknown property error
-      resource: {
-        role: 'reader',
-        type: 'anyone'
-      }
+      resource: resource
     },
       (err:Error, res:any) => {
         if (err) {