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client.go
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client.go
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package lastfm
import (
"crypto/md5"
"encoding/hex"
"encoding/xml"
"errors"
"fmt"
"net/http"
"net/url"
"regexp"
"sort"
"strconv"
"strings"
"time"
"github.com/andybalholm/cascadia"
"go.senan.xyz/gonic/db"
"go.senan.xyz/gonic/scrobble"
"golang.org/x/net/html"
)
var (
ErrLastFM = errors.New("last.fm error")
ErrNoUserSession = errors.New("no lastfm user session present")
)
type KeySecretFunc func() (apiKey, secret string, err error)
type Client struct {
httpClient *http.Client
keySecret KeySecretFunc
}
func NewClient(keySecret KeySecretFunc) *Client {
return NewClientCustom(http.DefaultClient, keySecret)
}
func NewClientCustom(httpClient *http.Client, keySecret KeySecretFunc) *Client {
return &Client{httpClient: httpClient, keySecret: keySecret}
}
const (
BaseURL = "https://ws.audioscrobbler.com/2.0/"
)
func (c *Client) ArtistGetInfo(artistName string) (Artist, error) {
apiKey, _, err := c.keySecret()
if err != nil {
return Artist{}, fmt.Errorf("get key and secret: %w", err)
}
params := url.Values{}
params.Add("method", "artist.getInfo")
params.Add("api_key", apiKey)
params.Add("artist", artistName)
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return Artist{}, fmt.Errorf("make request: %w", err)
}
resp.Artist.Bio.Summary = cleanLicenceText(resp.Artist.Bio.Summary)
resp.Artist.Bio.Content = cleanLicenceText(resp.Artist.Bio.Content)
return resp.Artist, nil
}
func (c *Client) AlbumGetInfo(artistName, albumName string) (Album, error) {
apiKey, _, err := c.keySecret()
if err != nil {
return Album{}, fmt.Errorf("get key and secret: %w", err)
}
params := url.Values{}
params.Add("method", "album.getInfo")
params.Add("api_key", apiKey)
params.Add("artist", artistName)
params.Add("album", albumName)
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return Album{}, fmt.Errorf("make request: %w", err)
}
resp.Album.Wiki.Summary = cleanLicenceText(resp.Album.Wiki.Summary)
resp.Album.Wiki.Content = cleanLicenceText(resp.Album.Wiki.Content)
return resp.Album, nil
}
func (c *Client) ArtistGetTopTracks(artistName string) (TopTracks, error) {
apiKey, _, err := c.keySecret()
if err != nil {
return TopTracks{}, fmt.Errorf("get key and secret: %w", err)
}
params := url.Values{}
params.Add("method", "artist.getTopTracks")
params.Add("api_key", apiKey)
params.Add("artist", artistName)
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return TopTracks{}, fmt.Errorf("make request: %w", err)
}
return resp.TopTracks, nil
}
func (c *Client) TrackGetSimilarTracks(artistName, trackName string) (SimilarTracks, error) {
apiKey, _, err := c.keySecret()
if err != nil {
return SimilarTracks{}, fmt.Errorf("get key and secret: %w", err)
}
params := url.Values{}
params.Add("method", "track.getSimilar")
params.Add("api_key", apiKey)
params.Add("track", trackName)
params.Add("artist", artistName)
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return SimilarTracks{}, fmt.Errorf("make request: %w", err)
}
return resp.SimilarTracks, nil
}
func (c *Client) ArtistGetSimilar(artistName string) (SimilarArtists, error) {
apiKey, _, err := c.keySecret()
if err != nil {
return SimilarArtists{}, fmt.Errorf("get key and secret: %w", err)
}
params := url.Values{}
params.Add("method", "artist.getSimilar")
params.Add("api_key", apiKey)
params.Add("artist", artistName)
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return SimilarArtists{}, fmt.Errorf("making similar artists GET: %w", err)
}
return resp.SimilarArtists, nil
}
func (c *Client) UserGetLovedTracks(userName string) (LovedTracks, error) {
apiKey, _, err := c.keySecret()
if err != nil {
return LovedTracks{}, fmt.Errorf("get key and secret: %w", err)
}
params := url.Values{}
params.Add("method", "user.getLovedTracks")
params.Add("api_key", apiKey)
params.Add("user", userName)
params.Add("limit", "1000") // TODO: paginate
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return LovedTracks{}, fmt.Errorf("making user get loved tracks GET: %w", err)
}
return resp.LovedTracks, nil
}
func (c *Client) GetSession(token string) (string, error) {
apiKey, secret, err := c.keySecret()
if err != nil {
return "", fmt.Errorf("get key and secret: %w", err)
}
params := url.Values{}
params.Add("method", "auth.getSession")
params.Add("api_key", apiKey)
params.Add("token", token)
params.Add("api_sig", GetParamSignature(params, secret))
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return "", fmt.Errorf("make request: %w", err)
}
return resp.Session.Key, nil
}
//nolint:gochecknoglobals
var artistOpenGraphQuery = cascadia.MustCompile(`html > head > meta[property="og:image"]`)
func (c *Client) StealArtistImage(artistURL string) (string, error) {
resp, err := c.httpClient.Get(artistURL) //nolint:gosec
if err != nil {
return "", fmt.Errorf("get artist url: %w", err)
}
defer resp.Body.Close()
node, err := html.Parse(resp.Body)
if err != nil {
return "", fmt.Errorf("parse html: %w", err)
}
n := cascadia.Query(node, artistOpenGraphQuery)
if n == nil {
return "", nil
}
var imageURL string
for _, attr := range n.Attr {
if attr.Key == "content" {
imageURL = attr.Val
break
}
}
return imageURL, nil
}
func (c *Client) IsUserAuthenticated(user db.User) bool {
return user.LastFMSession != ""
}
func (c *Client) Scrobble(user db.User, track scrobble.Track, stamp time.Time, submission bool) error {
apiKey, secret, err := c.keySecret()
if err != nil {
return fmt.Errorf("get key and secret: %w", err)
}
if !c.IsUserAuthenticated(user) {
return ErrNoUserSession
}
params := url.Values{}
if submission {
params.Add("method", "track.Scrobble")
params.Add("timestamp", strconv.Itoa(int(stamp.Unix()))) // last.fm wants the timestamp in seconds
} else {
params.Add("method", "track.updateNowPlaying")
}
params.Add("artist", track.Artist)
params.Add("track", track.Track)
params.Add("trackNumber", strconv.Itoa(int(track.TrackNumber)))
params.Add("album", track.Album)
params.Add("albumArtist", track.AlbumArtist)
params.Add("duration", strconv.Itoa(int(track.Duration.Seconds())))
if track.MusicBrainzID != "" {
params.Add("mbid", track.MusicBrainzID)
}
params.Add("sk", user.LastFMSession)
params.Add("api_key", apiKey)
params.Add("api_sig", GetParamSignature(params, secret))
_, err = c.makeRequest(http.MethodPost, params)
return err
}
func (c *Client) LoveTrack(user *db.User, track *db.Track) error {
apiKey, secret, err := c.keySecret()
if err != nil {
return fmt.Errorf("get key and secret: %w", err)
}
if !c.IsUserAuthenticated(*user) {
return ErrNoUserSession
}
params := url.Values{}
params.Add("method", "track.love")
params.Add("track", track.TagTitle)
params.Add("artist", track.TagTrackArtist)
params.Add("api_key", apiKey)
params.Add("sk", user.LastFMSession)
params.Add("api_sig", GetParamSignature(params, secret))
_, err = c.makeRequest(http.MethodPost, params)
return err
}
func (c *Client) GetCurrentUser(user *db.User) (User, error) {
apiKey, secret, err := c.keySecret()
if err != nil {
return User{}, fmt.Errorf("get key and secret: %w", err)
}
if !c.IsUserAuthenticated(*user) {
return User{}, ErrNoUserSession
}
params := url.Values{}
params.Add("method", "user.getInfo")
params.Add("api_key", apiKey)
params.Add("sk", user.LastFMSession)
params.Add("api_sig", GetParamSignature(params, secret))
resp, err := c.makeRequest(http.MethodGet, params)
if err != nil {
return User{}, fmt.Errorf("make request: %w", err)
}
return resp.User, nil
}
func (c *Client) makeRequest(method string, params url.Values) (LastFM, error) {
req, _ := http.NewRequest(method, BaseURL, nil)
req.URL.RawQuery = params.Encode()
resp, err := c.httpClient.Do(req)
if err != nil {
return LastFM{}, fmt.Errorf("get: %w", err)
}
defer resp.Body.Close()
var lastfm LastFM
if err = xml.NewDecoder(resp.Body).Decode(&lastfm); err != nil {
return LastFM{}, fmt.Errorf("decoding: %w", err)
}
if lastfm.Error.Code != 0 {
return LastFM{}, fmt.Errorf("%v: %w", lastfm.Error.Value, ErrLastFM)
}
return lastfm, nil
}
func GetParamSignature(params url.Values, secret string) string {
// the parameters must be in order before hashing
paramKeys := make([]string, 0, len(params))
for k := range params {
paramKeys = append(paramKeys, k)
}
sort.Strings(paramKeys)
toHash := ""
for _, k := range paramKeys {
toHash += k
toHash += params[k][0]
}
toHash += secret
hash := md5.Sum([]byte(toHash))
return hex.EncodeToString(hash[:])
}
var doublePuncExpr = regexp.MustCompile(`\.\s+\.\s+`)
var licenceExpr = regexp.MustCompile(`(?i)user-contributed text.*`)
func cleanLicenceText(text string) string {
text = licenceExpr.ReplaceAllString(text, "")
text = doublePuncExpr.ReplaceAllString(text, ". ")
text = strings.ReplaceAll(text, " .", ".")
text = strings.Join(strings.Fields(text), " ")
text = strings.TrimSpace(text)
return text
}