finish lastfm endpoint and fix clearing spotify now playing status

scrobble/lastfm.go

@@ -23,6 +23,15 @@ func NewLastFMHandler() *LastFMHandler {
 }
 
 func (h *LastFMHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method == "GET" {
+		if r.URL.Query().Get("hs") == "true" {
+			h.handleHandshake(w, r)
+			return
+		}
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
 	if r.Method != "POST" {
 		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
 		return
@@ -34,9 +43,12 @@ func (h *LastFMHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	method := r.FormValue("method")
-	apiKey := r.FormValue("api_key")
+	method := r.PostForm.Get("method")
+	apiKey := r.PostForm.Get("api_key")
+	sk := r.PostForm.Get("s")
+	track := r.PostForm.Get("t")
 
+	if method != "" {
 		switch method {
 		case "auth.gettoken":
 			h.handleGetToken(w, apiKey)
@@ -49,16 +61,26 @@ func (h *LastFMHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		default:
 			h.respond(w, "failed", 400, fmt.Sprintf("Invalid method: %s", method))
 		}
+		return
+	}
+
+	if sk != "" {
+		if r.PostForm.Get("a[0]") != "" && (r.PostForm.Get("t[0]") != "" || r.PostForm.Get("i[0]") != "") {
+			h.handleScrobble(w, r)
+			return
+		}
+		if track != "" {
+			h.handleNowPlaying(w, r)
+			return
+		}
+	}
+
+	h.respond(w, "failed", 400, "Missing required parameters")
 }
 
 func (h *LastFMHandler) respond(w http.ResponseWriter, status string, code int, message string) {
-	w.Header().Set("Content-Type", "application/xml; charset=utf-8")
-	fmt.Fprintf(w, `<?xml version="1.0" encoding="utf-8"?>
-<lfm status="%s">
-  <error code="%d">
-    <message>%s</message>
-  </error>
-</lfm>`, status, code, message)
+	w.Header().Set("Content-Type", "text/plain")
+	w.Write([]byte(fmt.Sprintf("FAILED %s", message)))
 }
 
 func (h *LastFMHandler) respondOK(w http.ResponseWriter, content string) {
@@ -66,6 +88,40 @@ func (h *LastFMHandler) respondOK(w http.ResponseWriter, content string) {
 	w.Write([]byte(content))
 }
 
+func (h *LastFMHandler) handleHandshake(w http.ResponseWriter, r *http.Request) {
+	username := r.URL.Query().Get("u")
+	token := r.URL.Query().Get("t")
+	authToken := r.URL.Query().Get("a")
+
+	if username == "" || token == "" || authToken == "" {
+		w.Write([]byte("BADAUTH"))
+		return
+	}
+
+	userId, err := GetUserByUsername(username)
+	if err != nil {
+		w.Write([]byte("BADAUTH"))
+		return
+	}
+
+	sessionKey, err := GenerateSessionKey()
+	if err != nil {
+		w.Write([]byte("FAILED Could not generate session"))
+		return
+	}
+
+	_, err = db.Pool.Exec(context.Background(),
+		`UPDATE users SET api_secret = $1 WHERE pk = $2`,
+		sessionKey, userId)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error updating session key: %v\n", err)
+		w.Write([]byte("FAILED Database error"))
+		return
+	}
+
+	w.Write([]byte(fmt.Sprintf("OK\n%s\nhttp://127.0.0.1:1234/2.0/\nhttp://127.0.0.1:1234/2.0/\n", sessionKey)))
+}
+
 func (h *LastFMHandler) handleGetToken(w http.ResponseWriter, apiKey string) {
 	userId, _, err := GetUserByAPIKey(apiKey)
 	if err != nil {
@@ -121,7 +177,7 @@ func (h *LastFMHandler) handleGetSession(w http.ResponseWriter, r *http.Request)
 }
 
 func (h *LastFMHandler) handleNowPlaying(w http.ResponseWriter, r *http.Request) {
-	sessionKey := r.FormValue("sk")
+	sessionKey := r.PostForm.Get("s")
 	if sessionKey == "" {
 		h.respond(w, "failed", 9, "Invalid session")
 		return
@@ -133,11 +189,16 @@ func (h *LastFMHandler) handleNowPlaying(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	artist := r.FormValue("artist")
-	track := r.FormValue("track")
-	album := r.FormValue("album")
+	artist := r.PostForm.Get("a")
+	track := r.PostForm.Get("t")
+	album := r.PostForm.Get("b")
 
-	duration := r.FormValue("duration")
+	if track == "" {
+		h.respondOK(w, "OK")
+		return
+	}
+
+	duration := r.PostForm.Get("l")
 	msPlayed := 0
 	if duration != "" {
 		if d, err := strconv.Atoi(duration); err == nil {
@@ -145,7 +206,6 @@ func (h *LastFMHandler) handleNowPlaying(w http.ResponseWriter, r *http.Request)
 		}
 	}
 
-	if track != "" {
 	UpdateNowPlaying(NowPlaying{
 		UserId:    userId,
 		SongName:  track,
@@ -155,14 +215,12 @@ func (h *LastFMHandler) handleNowPlaying(w http.ResponseWriter, r *http.Request)
 		Platform:  "lastfm_api",
 		UpdatedAt: time.Now(),
 	})
-	}
 
-	h.respondOK(w, `<?xml version="1.0" encoding="utf-8"?>
-<lfm status="ok"></lfm>`)
+	h.respondOK(w, "OK")
 }
 
 func (h *LastFMHandler) handleScrobble(w http.ResponseWriter, r *http.Request) {
-	sessionKey := r.FormValue("sk")
+	sessionKey := r.PostForm.Get("s")
 	if sessionKey == "" {
 		h.respond(w, "failed", 9, "Invalid session")
 		return
@@ -174,7 +232,7 @@ func (h *LastFMHandler) handleScrobble(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	scrobbles := h.parseScrobbles(r.Form, userId)
+	scrobbles := h.parseScrobbles(r.PostForm, userId)
 	if len(scrobbles) == 0 {
 		h.respond(w, "failed", 1, "No scrobbles to submit")
 		return
@@ -194,10 +252,7 @@ func (h *LastFMHandler) handleScrobble(w http.ResponseWriter, r *http.Request) {
 
 	ClearNowPlaying(userId)
 
-	h.respondOK(w, fmt.Sprintf(`<?xml version="1.0" encoding="utf-8"?>
-<lfm status="ok">
-  <scrobbles accepted="%d" ignored="%d"></scrobbles>
-</lfm>`, accepted, ignored))
+	h.respondOK(w, fmt.Sprintf("OK\n%d\n%d\n", accepted, ignored))
 }
 
 func (h *LastFMHandler) parseScrobbles(form url.Values, userId int) []Scrobble {
@@ -207,15 +262,15 @@ func (h *LastFMHandler) parseScrobbles(form url.Values, userId int) []Scrobble {
 		var artist, track, album, timestampStr string
 
 		if i == 0 {
-			artist = form.Get("artist")
-			track = form.Get("track")
-			album = form.Get("album")
-			timestampStr = form.Get("timestamp")
+			artist = form.Get("a[0]")
+			track = form.Get("t[0]")
+			album = form.Get("b[0]")
+			timestampStr = form.Get("i[0]")
 		} else {
-			artist = form.Get(fmt.Sprintf("artist[%d]", i-1))
-			track = form.Get(fmt.Sprintf("track[%d]", i-1))
-			album = form.Get(fmt.Sprintf("album[%d]", i-1))
-			timestampStr = form.Get(fmt.Sprintf("timestamp[%d]", i-1))
+			artist = form.Get(fmt.Sprintf("a[%d]", i))
+			track = form.Get(fmt.Sprintf("t[%d]", i))
+			album = form.Get(fmt.Sprintf("b[%d]", i))
+			timestampStr = form.Get(fmt.Sprintf("i[%d]", i))
 		}
 
 		if artist == "" || track == "" || timestampStr == "" {
@@ -227,7 +282,7 @@ func (h *LastFMHandler) parseScrobbles(form url.Values, userId int) []Scrobble {
 			continue
 		}
 
-		duration := form.Get(fmt.Sprintf("duration[%d]", i-1))
+		duration := form.Get(fmt.Sprintf("l[%d]", i))
 		msPlayed := 0
 		if duration != "" {
 			if d, err := strconv.Atoi(duration); err == nil {

scrobble/scrobble.go

@@ -36,7 +36,7 @@ type NowPlaying struct {
 	UpdatedAt time.Time
 }
 
-var CurrentNowPlaying = make(map[int]NowPlaying)
+var CurrentNowPlaying = make(map[int]map[string]NowPlaying)
 
 func GenerateAPIKey() (string, error) {
 	bytes := make([]byte, 16)
@@ -80,6 +80,20 @@ func GetUserByAPIKey(apiKey string) (int, string, error) {
 	return userId, username, nil
 }
 
+func GetUserByUsername(username string) (int, error) {
+	if username == "" {
+		return 0, fmt.Errorf("empty username")
+	}
+
+	var userId int
+	err := db.Pool.QueryRow(context.Background(),
+		"SELECT pk FROM users WHERE username = $1", username).Scan(&userId)
+	if err != nil {
+		return 0, err
+	}
+	return userId, nil
+}
+
 func GetUserBySessionKey(sessionKey string) (int, string, error) {
 	if sessionKey == "" {
 		return 0, "", fmt.Errorf("empty session key")
@@ -167,18 +181,38 @@ func checkDuplicate(userId int, artist, songName string, timestamp time.Time) (b
 }
 
 func UpdateNowPlaying(np NowPlaying) {
-	CurrentNowPlaying[np.UserId] = np
+	if CurrentNowPlaying[np.UserId] == nil {
+		CurrentNowPlaying[np.UserId] = make(map[string]NowPlaying)
+	}
+	CurrentNowPlaying[np.UserId][np.Platform] = np
 }
 
 func GetNowPlaying(userId int) (NowPlaying, bool) {
-	np, ok := CurrentNowPlaying[userId]
-	return np, ok
+	platforms := CurrentNowPlaying[userId]
+	if platforms == nil {
+		return NowPlaying{}, false
+	}
+	np, ok := platforms["lastfm_api"]
+	if ok && np.SongName != "" {
+		return np, true
+	}
+	np, ok = platforms["spotify"]
+	if ok && np.SongName != "" {
+		return np, true
+	}
+	return NowPlaying{}, false
 }
 
 func ClearNowPlaying(userId int) {
 	delete(CurrentNowPlaying, userId)
 }
 
+func ClearNowPlayingPlatform(userId int, platform string) {
+	if CurrentNowPlaying[userId] != nil {
+		delete(CurrentNowPlaying[userId], platform)
+	}
+}
+
 func GetUserSpotifyCredentials(userId int) (clientId, clientSecret, accessToken, refreshToken string, expiresAt time.Time, err error) {
 	var clientIdPg, clientSecretPg, accessTokenPg, refreshTokenPg pgtype.Text
 	var expiresAtPg pgtype.Timestamptz

scrobble/spotify.go

@@ -297,7 +297,7 @@ func checkCurrentlyPlaying(userId int, accessToken string) error {
 	defer resp.Body.Close()
 
 	if resp.StatusCode == 204 {
-		ClearNowPlaying(userId)
+		ClearNowPlayingPlatform(userId, "spotify")
 		return nil
 	}
 
@@ -311,7 +311,7 @@ func checkCurrentlyPlaying(userId int, accessToken string) error {
 	}
 
 	if !playing.IsPlaying || playing.Item.Name == "" {
-		ClearNowPlaying(userId)
+		ClearNowPlayingPlatform(userId, "spotify")
 		return nil
 	}
 

web/web.go

@@ -16,9 +16,15 @@ import (
 	"github.com/go-chi/chi/v5/middleware"
 )
 
+const serverAddr = "127.0.0.1:1234"
+
 // 50 MiB
 const maxHeaderSize int64 = 50 * 1024 * 1024
 
+func serverAddrStr() string {
+	return serverAddr
+}
+
 // Holds all the parsed HTML templates
 var templates *template.Template
 
@@ -68,7 +74,7 @@ func rootHandler() http.HandlerFunc {
 
 // Serves all pages at the specified address.
 func Start() {
-	addr := ":1234"
+	addr := serverAddr
 	r := chi.NewRouter()
 	r.Use(middleware.Logger)
 	r.Handle("/files/*", http.StripPrefix("/files", http.FileServer(http.Dir("./static"))))
@@ -84,7 +90,8 @@ func Start() {
 	r.Get("/import/lastfm/progress", importLastFMProgressHandler)
 	r.Get("/import/spotify/progress", importSpotifyProgressHandler)
 
-	r.Post("/2.0/", http.HandlerFunc(scrobble.NewLastFMHandler().ServeHTTP))
+	r.Handle("/2.0", scrobble.NewLastFMHandler())
+	r.Handle("/2.0/", scrobble.NewLastFMHandler())
 	r.Post("/1/submit-listens", http.HandlerFunc(scrobble.NewListenbrainzHandler().ServeHTTP))
 	r.Route("/scrobble/spotify", func(r chi.Router) {
 		r.Get("/authorize", http.HandlerFunc(scrobble.NewSpotifyHandler().ServeHTTP))