README
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Waltz
Transfer your playlists from Spotify to Youtube Music written in Go. Self hosted.
Usage
It's necessary to setup the API for Youtube and Spotify:
Spotify
Create a new project on developers.spotify.com. Make sure
the redirect URI is: http://localhost:8080/auth/callback?provider=spotify. Add the client id
and secret to the environment variables: SPOTIFY_ID, SPOTIFY_SECRET.
YouTube
Create a new project on console.cloud.google.com/. Under
API & Services -> Credentials create a new OAuth Client Id, choose Web Application. Make
sure the urls are these: 
Under API & Allowed Services add Youtube Data Api V3. Add the client id and secret to
the environment variables: GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET
Then just run the project with go run . and access the app on localhost:8080.
Limitations
Youtube gives a daily quota of 10.000 with each API call having a different cost. Currently for each playlist the operations costs are:
| Operation | Intent | Cost |
|---|---|---|
| list playlists | Find if playlist already exists | 1 |
| insert playlist | Create playlist if it doesn't exist | 50 |
| list playlist items | Get existing tracks to not insert repeated tracks | 1 for every 50 tracks |
| search | find videoId by name. Necessary to insert track | 100 |
| insert playlist item | Creates the track on the playlist | 50 |
Which is limited to around 66 tracks daily. Even if the read data comes from another source, like a scrapper, the number would improve to only 200 at best.
Documentation
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There is no documentation for this package.
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