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API: Fix out of bound error on empty playlists (#4696)

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Before this PR, Invidious assumed that every playlist had at least one video.
When a playlist had no videos, Invidious was throwing an "Index out of bounds"
exception.

The following API endpoints were impacted:
* api/v1/playlists/:plid
* api/v1/auth/playlists/:plid

Fixes issue 4679
This commit is contained in:
Samantaz Fox 2024-07-21 17:07:46 +02:00
commit 4f60feee17
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1 changed files with 3 additions and 1 deletions
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src/invidious/routes/api/v1/misc.cr
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@ -74,7 +74,9 @@ module Invidious::Routes::API::V1::Misc
response = playlist.to_json(offset, video_id: video_id)
json_response = JSON.parse(response)
if json_response["videos"].as_a[0]["index"] != offset
if json_response["videos"].as_a.empty?
json_response = JSON.parse(response)
elsif json_response["videos"].as_a[0]["index"] != offset
offset = json_response["videos"].as_a[0]["index"].as_i
lookback = offset < 50 ? offset : 50
response = playlist.to_json(offset - lookback)