scotty/backends/spotify/spotify.go

/*
Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

package spotify

import (
	"errors"
	"sort"
	"strconv"
	"time"

	"github.com/spf13/viper"
	"go.uploadedlobster.com/scotty/models"
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/spotify"
)

type SpotifyApiBackend struct {
	client       Client
	clientId     string
	clientSecret string
}

func (b *SpotifyApiBackend) Name() string { return "spotify" }

func (b *SpotifyApiBackend) FromConfig(config *viper.Viper) models.Backend {
	b.clientId = config.GetString("client-id")
	b.clientSecret = config.GetString("client-secret")
	return b
}

func (b *SpotifyApiBackend) OAuth2Config(redirectUrl string) oauth2.Config {
	return oauth2.Config{
		ClientID:     b.clientId,
		ClientSecret: b.clientSecret,
		Scopes:       []string{"user-read-recently-played"},
		RedirectURL:  redirectUrl,
		Endpoint:     spotify.Endpoint,
	}
}

func (b *SpotifyApiBackend) OAuth2Setup(redirectUrl string, token *oauth2.Token) error {
	config := b.OAuth2Config(redirectUrl)
	b.client = NewClient(config, token)
	return nil
}

func (b *SpotifyApiBackend) ExportListens(oldestTimestamp time.Time, results chan models.ListensResult, progress chan models.Progress) {
	startTime := time.Now()
	minTime := oldestTimestamp

	totalDuration := startTime.Sub(oldestTimestamp)

	defer close(results)
	defer close(progress)

	p := models.Progress{Total: int64(totalDuration.Seconds())}

	for {
		result, err := b.client.RecentlyPlayedAfter(minTime, MaxItemsPerGet)
		if err != nil {
			progress <- p.Complete()
			results <- models.ListensResult{Error: err}
			return
		}

		count := len(result.Items)
		if count == 0 {
			break
		}

		listens := make(models.ListensList, 0, len(result.Items))

		// Set minTime to the newest returned listen
		after, err := strconv.ParseInt(result.Cursors.After, 10, 64)
		if err != nil && after <= minTime.Unix() {
			err = errors.New("new cursor timestamp did not progress")
		}
		if err != nil {
			progress <- p.Complete()
			results <- models.ListensResult{Error: err}
			return
		}
		minTime = time.Unix(after, 0)
		remainingTime := startTime.Sub(minTime)

		for _, listen := range result.Items {
			listens = append(listens, listen.ToListen())
		}

		sort.Sort(listens)
		p.Elapsed = int64(totalDuration.Seconds() - remainingTime.Seconds())
		progress <- p
		results <- models.ListensResult{Listens: listens, OldestTimestamp: oldestTimestamp}
	}

	progress <- p.Complete()
}

func (l Listen) ToListen() models.Listen {
	track := l.Track
	listen := models.Listen{
		Track: models.Track{
			TrackName:      track.Name,
			ReleaseName:    track.Album.Name,
			ArtistNames:    make([]string, 0, len(track.Artists)),
			Duration:       time.Duration(track.DurationMs * int(time.Millisecond)),
			TrackNumber:    track.TrackNumber,
			Isrc:           track.ExternalIds.ISRC,
			AdditionalInfo: map[string]any{},
		},
	}

	listen.ListenedAt, _ = time.Parse(time.RFC3339, l.PlayedAt)

	for _, artist := range track.Artists {
		listen.Track.ArtistNames = append(listen.Track.ArtistNames, artist.Name)
	}

	info := listen.AdditionalInfo
	if !l.Track.IsLocal {
		info["music_service"] = "spotify.com"
	}

	if track.ExternalUrls.Spotify != "" {
		info["origin_url"] = track.ExternalUrls.Spotify
		info["spotify_id"] = track.ExternalUrls.Spotify
	}

	if track.Album.ExternalUrls.Spotify != "" {
		info["spotify_album_id"] = track.Album.ExternalUrls.Spotify
	}

	if len(track.Artists) > 0 {
		info["spotify_artist_ids"] = extractArtistIds(track.Artists)
	}

	if len(track.Album.Artists) > 0 {
		info["spotify_album_artist_ids"] = extractArtistIds(track.Album.Artists)
	}

	return listen
}

func extractArtistIds(artists []Artist) []string {
	artistIds := make([]string, len(artists))
	for i, artist := range artists {
		artistIds[i] = artist.ExternalUrls.Spotify
	}
	return artistIds
}