Initial work on Shares

server/public/encode_artwork_id.go

@@ -34,5 +34,10 @@ func DecodeArtworkID(tokenString string) (model.ArtworkID, error) {
 	if !ok {
 		return model.ArtworkID{}, errors.New("invalid id type")
 	}
-	return model.ParseArtworkID(id)
+	artID, err := model.ParseArtworkID(id)
+	if err == nil {
+		return artID, nil
+	}
+	// Try to default to mediafile artworkId
+	return model.ParseArtworkID("mf-" + id)
 }

server/public/public_endpoints.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/go-chi/chi/v5"
+	"github.com/navidrome/navidrome/core"
 	"github.com/navidrome/navidrome/core/artwork"
 	"github.com/navidrome/navidrome/log"
 	"github.com/navidrome/navidrome/model"
@@ -17,11 +18,12 @@ import (
 
 type Router struct {
 	http.Handler
-	artwork artwork.Artwork
+	artwork  artwork.Artwork
+	streamer core.MediaStreamer
 }
 
-func New(artwork artwork.Artwork) *Router {
-	p := &Router{artwork: artwork}
+func New(artwork artwork.Artwork, streamer core.MediaStreamer) *Router {
+	p := &Router{artwork: artwork, streamer: streamer}
 	p.Handler = p.routes()
 
 	return p
@@ -32,6 +34,7 @@ func (p *Router) routes() http.Handler {
 
 	r.Group(func(r chi.Router) {
 		r.Use(server.URLParamsMiddleware)
+		r.HandleFunc("/s/{id}", p.handleStream)
 		r.HandleFunc("/img/{id}", p.handleImages)
 	})
 	return r

server/public/share_stream.go

@@ -0,0 +1,104 @@
+package public
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net/http"
+	"strconv"
+
+	"github.com/lestrrat-go/jwx/v2/jwt"
+	"github.com/navidrome/navidrome/core/auth"
+	"github.com/navidrome/navidrome/log"
+	"github.com/navidrome/navidrome/utils"
+)
+
+func (p *Router) handleStream(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	tokenId := r.URL.Query().Get(":id")
+	info, err := decodeStreamInfo(tokenId)
+	if err != nil {
+		log.Error(ctx, "Error parsing shared stream info", err)
+		http.Error(w, "invalid request", http.StatusBadRequest)
+		return
+	}
+
+	stream, err := p.streamer.NewStream(ctx, info.id, info.format, info.bitrate)
+	if err != nil {
+		log.Error(ctx, "Error starting shared stream", err)
+		http.Error(w, "invalid request", http.StatusInternalServerError)
+	}
+
+	// Make sure the stream will be closed at the end, to avoid leakage
+	defer func() {
+		if err := stream.Close(); err != nil && log.CurrentLevel() >= log.LevelDebug {
+			log.Error("Error closing shared stream", "id", info.id, "file", stream.Name(), err)
+		}
+	}()
+
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+	w.Header().Set("X-Content-Duration", strconv.FormatFloat(float64(stream.Duration()), 'G', -1, 32))
+
+	if stream.Seekable() {
+		http.ServeContent(w, r, stream.Name(), stream.ModTime(), stream)
+	} else {
+		// If the stream doesn't provide a size (i.e. is not seekable), we can't support ranges/content-length
+		w.Header().Set("Accept-Ranges", "none")
+		w.Header().Set("Content-Type", stream.ContentType())
+
+		estimateContentLength := utils.ParamBool(r, "estimateContentLength", false)
+
+		// if Client requests the estimated content-length, send it
+		if estimateContentLength {
+			length := strconv.Itoa(stream.EstimatedContentLength())
+			log.Trace(ctx, "Estimated content-length", "contentLength", length)
+			w.Header().Set("Content-Length", length)
+		}
+
+		if r.Method == http.MethodHead {
+			go func() { _, _ = io.Copy(io.Discard, stream) }()
+		} else {
+			c, err := io.Copy(w, stream)
+			if log.CurrentLevel() >= log.LevelDebug {
+				if err != nil {
+					log.Error(ctx, "Error sending shared transcoded file", "id", info.id, err)
+				} else {
+					log.Trace(ctx, "Success sending shared transcode file", "id", info.id, "size", c)
+				}
+			}
+		}
+	}
+}
+
+type shareTrackInfo struct {
+	id      string
+	format  string
+	bitrate int
+}
+
+func decodeStreamInfo(tokenString string) (shareTrackInfo, error) {
+	token, err := auth.TokenAuth.Decode(tokenString)
+	if err != nil {
+		return shareTrackInfo{}, err
+	}
+	if token == nil {
+		return shareTrackInfo{}, errors.New("unauthorized")
+	}
+	err = jwt.Validate(token, jwt.WithRequiredClaim("id"))
+	if err != nil {
+		return shareTrackInfo{}, err
+	}
+	claims, err := token.AsMap(context.Background())
+	if err != nil {
+		return shareTrackInfo{}, err
+	}
+	id, ok := claims["id"].(string)
+	if !ok {
+		return shareTrackInfo{}, errors.New("invalid id type")
+	}
+	resp := shareTrackInfo{}
+	resp.id = id
+	resp.format, ok = claims["f"].(string)
+	resp.bitrate, ok = claims["b"].(int)
+	return resp, nil
+}