132 lines
3.0 KiB
Go
132 lines
3.0 KiB
Go
// Package ctrlsubsonic provides HTTP handlers for subsonic API
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package ctrlsubsonic
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import (
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"encoding/json"
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"encoding/xml"
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"fmt"
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"io"
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"log"
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"net/http"
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"go.senan.xyz/gonic/jukebox"
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"go.senan.xyz/gonic/podcasts"
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"go.senan.xyz/gonic/scrobble"
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"go.senan.xyz/gonic/server/ctrlbase"
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"go.senan.xyz/gonic/server/ctrlsubsonic/params"
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"go.senan.xyz/gonic/server/ctrlsubsonic/spec"
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"go.senan.xyz/gonic/transcode"
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)
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type CtxKey int
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const (
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CtxUser CtxKey = iota
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CtxSession
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CtxParams
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)
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type MusicPath struct {
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Alias, Path string
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}
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func PathsOf(paths []MusicPath) []string {
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var r []string
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for _, p := range paths {
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r = append(r, p.Path)
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}
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return r
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}
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type Controller struct {
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*ctrlbase.Controller
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MusicPaths []MusicPath
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PodcastsPath string
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CacheAudioPath string
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CoverCachePath string
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Jukebox *jukebox.Jukebox
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Scrobblers []scrobble.Scrobbler
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Podcasts *podcasts.Podcasts
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Transcoder transcode.Transcoder
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}
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type metaResponse struct {
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XMLName xml.Name `xml:"subsonic-response" json:"-"`
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*spec.Response `json:"subsonic-response"`
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}
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type errWriter struct {
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w io.Writer
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err error
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}
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func (ew *errWriter) write(buf []byte) {
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if ew.err != nil {
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return
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}
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_, ew.err = ew.w.Write(buf)
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}
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func writeResp(w http.ResponseWriter, r *http.Request, resp *spec.Response) error {
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if resp == nil {
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return nil
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}
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if resp.Error != nil {
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log.Printf("subsonic error code %d: %s", resp.Error.Code, resp.Error.Message)
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}
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res := metaResponse{Response: resp}
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params := r.Context().Value(CtxParams).(params.Params)
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ew := &errWriter{w: w}
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switch v, _ := params.Get("f"); v {
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case "json":
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w.Header().Set("Content-Type", "application/json")
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data, err := json.Marshal(res)
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if err != nil {
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return fmt.Errorf("marshal to json: %w", err)
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}
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ew.write(data)
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case "jsonp":
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w.Header().Set("Content-Type", "application/javascript")
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data, err := json.Marshal(res)
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if err != nil {
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return fmt.Errorf("marshal to jsonp: %w", err)
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}
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// TODO: error if no callback provided instead of using a default
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pCall := params.GetOr("callback", "cb")
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ew.write([]byte(pCall))
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ew.write([]byte("("))
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ew.write(data)
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ew.write([]byte(");"))
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default:
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w.Header().Set("Content-Type", "application/xml")
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data, err := xml.MarshalIndent(res, "", " ")
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if err != nil {
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return fmt.Errorf("marshal to xml: %w", err)
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}
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ew.write(data)
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}
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return ew.err
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}
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type (
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handlerSubsonic func(r *http.Request) *spec.Response
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handlerSubsonicRaw func(w http.ResponseWriter, r *http.Request) *spec.Response
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)
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func (c *Controller) H(h handlerSubsonic) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if err := writeResp(w, r, h(r)); err != nil {
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log.Printf("error writing subsonic response: %v\n", err)
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}
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})
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}
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func (c *Controller) HR(h handlerSubsonicRaw) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if err := writeResp(w, r, h(w, r)); err != nil {
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log.Printf("error writing raw subsonic response: %v\n", err)
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}
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})
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}
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