symlink support

go.mod

@@ -3,6 +3,7 @@ module git.milar.in/milarin/music-library
 go 1.20
 
 require (
+	git.milar.in/milarin/adverr v1.1.0
 	git.milar.in/milarin/envvars/v2 v2.0.0
 	git.milar.in/milarin/slices v0.0.6
 	github.com/gorilla/mux v1.8.0

go.sum

@@ -1,3 +1,5 @@
+git.milar.in/milarin/adverr v1.1.0 h1:jD9WnOvs40lfMhvqQ7cllOaRJNBMWr1f07/s9jAadp0=
+git.milar.in/milarin/adverr v1.1.0/go.mod h1:joU9sBb7ySyNv4SpTXB0Z4o1mjXsArBw4N27wjgzj9E=
 git.milar.in/milarin/envvars/v2 v2.0.0 h1:DWRQCWaHqzDD8NGpSgv5tYLuF9A/dVFPAtTvz3oiIqE=
 git.milar.in/milarin/envvars/v2 v2.0.0/go.mod h1:HkdEi+gG2lJSmVq547bTlQV4qQ0hO333bE8IrE0B9yY=
 git.milar.in/milarin/slices v0.0.6 h1:AQoSarZ58WHYol9c6woWJSe8wFpPC2RC4cvIlZpfg9s=

library.go

@@ -4,23 +4,29 @@ import (
 	"os"
 	"path/filepath"
 
+	"git.milar.in/milarin/adverr"
 	"git.milar.in/milarin/slices"
 )
 
 type Playlist struct {
 	Name  string `json:"name"`
-	Songs []string `json:"songs"`
+	Songs []Song `json:"songs"`
 }
 
-func GetAll() ([]Playlist, error) {
+type Song struct {
-	playlistNames, err := GetPlaylists()
+	Name string `json:"name"`
+	File string `json:"file"`
+}
+
+func GetAllPlaylists() ([]Playlist, error) {
+	playlistNames, err := GetAllPlaylistNames()
 	if err != nil {
 		return nil, err
 	}
 
 	playlists := make([]Playlist, 0, len(playlistNames))
 	for _, playlistName := range playlistNames {
-		songs, err := GetSongs(playlistName)
+		songs, err := GetSongsByPlaylist(playlistName)
 		if err != nil {
 			return nil, err
 		}
@@ -34,7 +40,7 @@ func GetAll() ([]Playlist, error) {
 	return playlists, nil
 }
 
-func GetPlaylists() ([]string, error) {
+func GetAllPlaylistNames() ([]string, error) {
 	entries, err := os.ReadDir(LibraryPath)
 	if err != nil {
 		return nil, err
@@ -44,12 +50,17 @@ func GetPlaylists() ([]string, error) {
 	return slices.Map(directories, FsEntry2Name), nil
 }
 
-func GetSongs(playlist string) ([]string, error) {
+func GetSongsByPlaylist(playlist string) ([]Song, error) {
 	entries, err := os.ReadDir(filepath.Join(LibraryPath, playlist))
 	if err != nil {
 		return nil, err
 	}
 
-	directories := slices.Filter(entries, Not(IsDir))
+	symlinks := slices.Filter(entries, IsSymlink)
-	return slices.Map(directories, FsEntry2Name), nil
+	return slices.Map(symlinks, func(entry os.DirEntry) Song {
+		return Song{
+			Name: FsEntry2Name(entry),
+			File: filepath.Base(adverr.Must(os.Readlink(filepath.Join(LibraryPath, playlist, entry.Name())))),
+		}
+	}), nil
 }

main.go

@@ -6,10 +6,14 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"math/rand"
 	"net/http"
+	"os"
+	"os/exec"
 	"path/filepath"
 
 	"git.milar.in/milarin/envvars/v2"
+	"git.milar.in/milarin/slices"
 	"github.com/gorilla/mux"
 )
 
@@ -20,13 +24,19 @@ var (
 )
 
 func main() {
+	if _, err := exec.LookPath("ffmpeg"); err != nil {
+		panic("ffmpeg not found in PATH")
+	}
+
 	r := mux.NewRouter()
 
 	r.HandleFunc("/all/", GetAllHandler).Methods("GET")
 	r.HandleFunc("/all/hash/", GetAllHashHandler).Methods("GET")
-	r.HandleFunc("/playlist/", GetPlaylistsHandler).Methods("GET")
+	r.HandleFunc("/playlist-names/", GetPlaylistNamesHandler).Methods("GET")
 	r.HandleFunc("/playlist/{playlist}/", GetPlaylistHandler).Methods("GET")
-	r.HandleFunc("/playlist/{playlist}/song/{song}/", GetSongHandler).Methods("GET")
+	r.HandleFunc("/file/{file}/", GetFileHandler).Methods("GET")
+	r.HandleFunc("/file/{file}/{format}/", GetEncodeFileHandler).Methods("GET")
+	r.HandleFunc("/file/", GetAllFilesHandler).Methods("GET")
 
 	fmt.Printf("Starting music server on port %d\n", HttpPort)
 	if err := http.ListenAndServe(fmt.Sprintf("%s:%d", HttpIntf, HttpPort), r); err != nil {
@@ -35,7 +45,7 @@ func main() {
 }
 
 func GetAllHashHandler(w http.ResponseWriter, r *http.Request) {
-	playlists, err := GetAll()
+	playlists, err := GetAllPlaylists()
 	if err != nil {
 		InternalServerError(w, err)
 		return
@@ -55,7 +65,7 @@ func GetAllHashHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func GetAllHandler(w http.ResponseWriter, r *http.Request) {
-	playlists, err := GetAll()
+	playlists, err := GetAllPlaylists()
 	if err != nil {
 		InternalServerError(w, err)
 		return
@@ -68,40 +78,86 @@ func GetAllHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func GetSongHandler(w http.ResponseWriter, r *http.Request) {
+func GetFileHandler(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
-	playlist := vars["playlist"]
+	file := vars["file"]
-	song := vars["song"]
 
-	http.ServeFile(w, r, filepath.Join(LibraryPath, playlist, song))
+	http.ServeFile(w, r, filepath.Join(LibraryPath, ".songs", file))
 }
 
 func GetPlaylistHandler(w http.ResponseWriter, r *http.Request) {
-	playlist := mux.Vars(r)["playlist"]
+	playlistName := mux.Vars(r)["playlist"]
 
-	songs, err := GetSongs(playlist)
+	songs, err := GetSongsByPlaylist(playlistName)
+	if err != nil {
+		InternalServerError(w, err)
+		return
+	}
+
+	playlist := Playlist{
+		Name:  playlistName,
+		Songs: songs,
+	}
+
+	w.Header().Add("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(playlist); err != nil {
+		InternalServerError(w, err)
+		return
+	}
+}
+
+func GetPlaylistNamesHandler(w http.ResponseWriter, r *http.Request) {
+	playlistNames, err := GetAllPlaylistNames()
 	if err != nil {
 		InternalServerError(w, err)
 		return
 	}
 
 	w.Header().Add("Content-Type", "application/json")
-	if err := json.NewEncoder(w).Encode(songs); err != nil {
+	if err := json.NewEncoder(w).Encode(playlistNames); err != nil {
 		InternalServerError(w, err)
 		return
 	}
 }
 
-func GetPlaylistsHandler(w http.ResponseWriter, r *http.Request) {
+func GetAllFilesHandler(w http.ResponseWriter, r *http.Request) {
-	playlists, err := GetPlaylists()
+	fileDirectory := filepath.Join(LibraryPath, ".songs")
+
+	entries, err := os.ReadDir(fileDirectory)
 	if err != nil {
 		InternalServerError(w, err)
 		return
 	}
 
+	files := slices.Filter(entries, IsRegular)
+	fileNames := slices.Map(files, FsEntry2Name)
+
 	w.Header().Add("Content-Type", "application/json")
-	if err := json.NewEncoder(w).Encode(playlists); err != nil {
+	if err := json.NewEncoder(w).Encode(fileNames); err != nil {
 		InternalServerError(w, err)
 		return
 	}
 }
+
+func GetEncodeFileHandler(w http.ResponseWriter, r *http.Request) {
+	fileName := mux.Vars(r)["file"]
+	format := mux.Vars(r)["format"]
+
+	inputFilePath := filepath.Join(LibraryPath, ".songs", fileName)
+	outputFilePath := filepath.Join(os.TempDir(), fmt.Sprintf("%d.%s", rand.Int(), format))
+	defer os.Remove(outputFilePath)
+
+	fmt.Printf("encode file to %s: '%s' -> '%s'\n", format, inputFilePath, outputFilePath)
+
+	cmd := exec.Command("ffmpeg", "-i", inputFilePath, "-vn", outputFilePath)
+	if err := cmd.Start(); err != nil {
+		InternalServerError(w, err)
+		return
+	}
+	if err := cmd.Wait(); err != nil {
+		InternalServerError(w, err)
+		return
+	}
+
+	http.ServeFile(w, r, outputFilePath)
+}

utils.go

@@ -37,6 +37,14 @@ func Not[T any](f func(T) bool) func(T) bool {
 	}
 }
 
+func IsSymlink(entry os.DirEntry) bool {
+	return entry.Type()&os.ModeSymlink == os.ModeSymlink
+}
+
+func IsRegular(entry os.DirEntry) bool {
+	return entry.Type().IsRegular()
+}
+
 func IsDir(entry os.DirEntry) bool {
 	return entry.IsDir()
 }