[Bug]: Users able to add and download duplicate podcast episodes to queue

[nichwall]

Describe the issue

Users can mark the same episode for download multiple times using the "Find Episodes" modal. This adds the episode to the queue multiple times and results in duplicate files being downloaded and added to the podcast. A check against the queue before adding should be sufficient to fix this issue, or ensuring the queue has unique entries.

Download Queue:

Podcast Episodes with library item ID in the filename:

Podcast Files

Steps to reproduce the issue

1. Select a podcast episode to download using the "Find Episodes" modal
2. Add one or more episodes to the download queue
3. Open the "Find Episodes" modal again and select episodes add to the queue again

Audiobookshelf version

2.8.0

How are you running audiobookshelf?

Docker

[nichwall]

It is also possible to add episodes to the download queue if they finish downloading while the modal is open because the modal doesn't update on downloads, so adding to queue would also need to check if the episode already exists on the server. This may help with some other duplicate downloads issues that have been reported.

[RoyWolfe]

I'm running into a similar issue, probably for the same reason. I'm converting some youtube channels to audio-only to listen to. That conversion is not a fast process and since I have several channels I follow, ABS checks for new episodes again while the same files are still in the queue waiting to be downloaded, causing it to be added multiple times to the download queue.

[github-actions]

Fixed in v2.20.0.