/
handlers_raw.go
282 lines (252 loc) · 7.87 KB
/
handlers_raw.go
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package ctrlsubsonic
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"time"
"github.com/disintegration/imaging"
"github.com/jinzhu/gorm"
"go.senan.xyz/gonic/db"
"go.senan.xyz/gonic/infocache/artistinfocache"
"go.senan.xyz/gonic/server/ctrlsubsonic/params"
"go.senan.xyz/gonic/server/ctrlsubsonic/spec"
"go.senan.xyz/gonic/server/ctrlsubsonic/specid"
"go.senan.xyz/gonic/server/ctrlsubsonic/specidpaths"
"go.senan.xyz/gonic/transcode"
)
// "raw" handlers are ones that don't always return a spec response.
// it could be a file, stream, etc. so you must either
// a) write to response writer
// b) return a non-nil spec.Response
// _but not both_
const (
coverDefaultSize = 600
coverCacheFormat = "png"
)
func (c *Controller) ServeGetCoverArt(w http.ResponseWriter, r *http.Request) *spec.Response {
params := r.Context().Value(CtxParams).(params.Params)
id, err := params.GetID("id")
if err != nil {
return spec.NewError(10, "please provide an `id` parameter")
}
size := params.GetOrInt("size", coverDefaultSize)
cachePath := filepath.Join(
c.cacheCoverPath,
fmt.Sprintf("%s-%d.%s", id.String(), size, coverCacheFormat),
)
_, err = os.Stat(cachePath)
switch {
case os.IsNotExist(err):
reader, err := coverFor(c.dbc, c.artistInfoCache, id)
if err != nil {
return spec.NewError(10, "couldn't find cover %q: %v", id, err)
}
defer reader.Close()
if err := coverScaleAndSave(reader, cachePath, size); err != nil {
log.Printf("error scaling cover: %v", err)
return nil
}
case err != nil:
log.Printf("error stating %q: %v", cachePath, err)
return nil
}
w.Header().Set("Cache-Control", "public, max-age=3600")
http.ServeFile(w, r, cachePath)
return nil
}
var (
errCoverNotFound = errors.New("could not find a cover with that id")
errCoverEmpty = errors.New("no cover found")
)
// TODO: can we use specidpaths.Locate here?
func coverFor(dbc *db.DB, artistInfoCache *artistinfocache.ArtistInfoCache, id specid.ID) (io.ReadCloser, error) {
switch id.Type {
case specid.Album:
return coverForAlbum(dbc, id.Value)
case specid.Artist:
return coverForArtist(artistInfoCache, id.Value)
case specid.Podcast:
return coverForPodcast(dbc, id.Value)
case specid.PodcastEpisode:
return coverGetPathPodcastEpisode(dbc, id.Value)
default:
return nil, errCoverNotFound
}
}
func coverForAlbum(dbc *db.DB, id int) (*os.File, error) {
var folder db.Album
err := dbc.DB.
Select("id, root_dir, left_path, right_path, cover").
First(&folder, id).
Error
if err != nil {
return nil, fmt.Errorf("select album: %w", err)
}
if folder.Cover == "" {
return nil, errCoverEmpty
}
return os.Open(filepath.Join(folder.RootDir, folder.LeftPath, folder.RightPath, folder.Cover))
}
func coverForArtist(artistInfoCache *artistinfocache.ArtistInfoCache, id int) (io.ReadCloser, error) {
info, err := artistInfoCache.Get(context.Background(), id)
if err != nil {
return nil, fmt.Errorf("get artist info from cache: %w", err)
}
if info.ImageURL == "" {
return nil, fmt.Errorf("%w: cache miss", errCoverEmpty)
}
resp, err := http.Get(info.ImageURL)
if err != nil {
return nil, fmt.Errorf("req image from lastfm: %w", err)
}
return resp.Body, nil
}
func coverForPodcast(dbc *db.DB, id int) (*os.File, error) {
var podcast db.Podcast
err := dbc.
First(&podcast, id).
Error
if err != nil {
return nil, fmt.Errorf("select podcast: %w", err)
}
if podcast.Image == "" {
return nil, errCoverEmpty
}
return os.Open(filepath.Join(podcast.RootDir, podcast.Image))
}
func coverGetPathPodcastEpisode(dbc *db.DB, id int) (*os.File, error) {
var pe db.PodcastEpisode
err := dbc.
Preload("Podcast").
First(&pe, id).
Error
if err != nil {
return nil, fmt.Errorf("select episode: %w", err)
}
if pe.Podcast == nil || pe.Podcast.Image == "" {
return nil, errCoverEmpty
}
return os.Open(filepath.Join(pe.Podcast.RootDir, pe.Podcast.Image))
}
func coverScaleAndSave(reader io.Reader, cachePath string, size int) error {
src, err := imaging.Decode(reader)
if err != nil {
return fmt.Errorf("resizing: %w", err)
}
width := size
if width > src.Bounds().Dx() {
// don't upscale images
width = src.Bounds().Dx()
}
if err = imaging.Save(imaging.Resize(src, width, 0, imaging.Lanczos), cachePath); err != nil {
return fmt.Errorf("caching %q: %w", cachePath, err)
}
return nil
}
func (c *Controller) ServeStream(w http.ResponseWriter, r *http.Request) *spec.Response {
params := r.Context().Value(CtxParams).(params.Params)
user := r.Context().Value(CtxUser).(*db.User)
id, err := params.GetID("id")
if err != nil {
return spec.NewError(10, "please provide an `id` parameter")
}
file, err := specidpaths.Locate(c.dbc, id)
if err != nil {
return spec.NewError(0, "error looking up id %s: %v", id, err)
}
audioFile, ok := file.(db.AudioFile)
if !ok {
return spec.NewError(0, "type of id does not contain audio")
}
maxBitRate, _ := params.GetInt("maxBitRate")
format, _ := params.Get("format")
timeOffset, _ := params.GetInt("timeOffset")
if format == "raw" {
http.ServeFile(w, r, file.AbsPath())
return nil
}
client, _ := params.Get("c")
pref, err := streamGetTransodePreference(c.dbc, user.ID, client)
if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
return spec.NewError(0, "couldn't find transcode preference: %v", err)
}
if pref == nil {
log.Printf("serving raw file, no user transcode preferences found for client %q", client)
http.ServeFile(w, r, file.AbsPath())
return nil
}
if maxBitRate >= audioFile.AudioBitrate() {
log.Printf("serving raw file, requested max bitrate %d is greater or equal to %d", maxBitRate, audioFile.AudioBitrate())
http.ServeFile(w, r, file.AbsPath())
return nil
}
profile, ok := transcode.UserProfiles[pref.Profile]
if !ok {
return spec.NewError(0, "unknown transcode user profile %q", pref.Profile)
}
if maxBitRate > 0 && int(profile.BitRate()) > maxBitRate {
profile = transcode.WithBitrate(profile, transcode.BitRate(maxBitRate))
}
if timeOffset > 0 {
profile = transcode.WithSeek(profile, time.Second*time.Duration(timeOffset))
}
log.Printf("trancoding to %q with at bitrate %d", profile.MIME(), profile.BitRate())
w.Header().Set("Content-Type", profile.MIME())
if err := c.transcoder.Transcode(r.Context(), profile, file.AbsPath(), w); err != nil && !errors.Is(err, transcode.ErrFFmpegKilled) {
return spec.NewError(0, "error transcoding: %v", err)
}
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
return nil
}
func (c *Controller) ServeGetAvatar(w http.ResponseWriter, r *http.Request) *spec.Response {
params := r.Context().Value(CtxParams).(params.Params)
user := r.Context().Value(CtxUser).(*db.User)
username, err := params.Get("username")
if err != nil {
return spec.NewError(10, "please provide an `username` parameter")
}
reqUser := c.dbc.GetUserByName(username)
if (user.ID != reqUser.ID) && !user.IsAdmin {
return spec.NewError(50, "user not admin")
}
http.ServeContent(w, r, "", time.Now(), bytes.NewReader(reqUser.Avatar))
return nil
}
func streamGetTransodePreference(dbc *db.DB, userID int, client string) (*db.TranscodePreference, error) {
var pref db.TranscodePreference
err := dbc.
Where("user_id=?", userID).
Where("client COLLATE NOCASE IN (?)", []string{"*", client}).
Order("client DESC"). // ensure "*" is last if it's there
First(&pref).
Error
if errors.Is(err, gorm.ErrRecordNotFound) {
return nil, nil
}
if err != nil {
return nil, fmt.Errorf("find transcode preference: %w", err)
}
return &pref, nil
}
func streamGetTranscodeMeta(dbc *db.DB, userID int, client string) spec.TranscodeMeta {
pref, _ := streamGetTransodePreference(dbc, userID, client)
if pref == nil {
return spec.TranscodeMeta{}
}
profile, ok := transcode.UserProfiles[pref.Profile]
if !ok {
return spec.TranscodeMeta{}
}
return spec.TranscodeMeta{
TranscodedContentType: profile.MIME(),
TranscodedSuffix: profile.Suffix(),
}
}