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package main
import (
"compress/gzip"
"encoding/xml"
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
"regexp"
"strings"
)
var (
docType = `<!DOCTYPE tv SYSTEM "xmltv.dtd">`
epgRE = regexp.MustCompile(`url-tvg="([a-z0-9-:/.]+)"`)
channelRE = regexp.MustCompile(`tvg-id="([a-z0-9-]+)"`)
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: epgpruner URL\n")
flag.PrintDefaults()
os.Exit(2)
}
func main() {
flag.Usage = usage
flag.Parse()
if flag.NArg() != 1 {
usage()
os.Exit(1)
}
playlistURL := flag.Args()[0]
playlist := Playlist{
URL: playlistURL,
}
err := playlist.Fetch()
if err != nil {
log.Fatal(err)
}
playlist.Reduce()
reducedEpg, err := xml.MarshalIndent(playlist.Epg, "", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println(
xml.Header +
docType + "\n" +
string(reducedEpg),
)
}
type Playlist struct {
URL string
EpgURL string
Channels map[string]struct{}
Epg Epg
}
func (p *Playlist) Fetch() error {
compressed := false
body, err := fetch(p.URL, compressed)
if err != nil {
return err
}
err = p.parse(body)
if err != nil {
return err
}
compressed = true
body, err = fetch(p.EpgURL, compressed)
if err != nil {
return err
}
err = xml.Unmarshal(body, &p.Epg)
if err != nil {
return err
}
return nil
}
func fetch(url string, compressed bool) ([]byte, error) {
resp, err := http.Get(url)
if err != nil {
return make([]byte, 0), err
}
if resp.StatusCode != http.StatusOK {
return make([]byte, 0),
fmt.Errorf("Bad reponse status: %d", resp.StatusCode)
}
reader := resp.Body
defer reader.Close()
if compressed {
reader, err = gzip.NewReader(reader)
if err != nil {
return make([]byte, 0), err
}
}
body, err := io.ReadAll(reader)
if err != nil {
return make([]byte, 0), err
}
return body, nil
}
func (p *Playlist) parse(body []byte) error {
epgURL := ""
channels := make(map[string]struct{})
for _, line := range strings.Split(string(body), "\n") {
if strings.HasPrefix(line, "#EXTM3U") {
m := epgRE.FindStringSubmatch(line)
if m == nil {
return fmt.Errorf(
"Couldn't match EPG url from: `%s`",
line,
)
}
epgURL = m[1]
} else if strings.HasPrefix(line, "#EXTINF") {
m := channelRE.FindStringSubmatch(line)
if m == nil {
return fmt.Errorf(
"Couldn't match channel name from: `%s`",
line,
)
}
channel := m[1]
channels[channel] = struct{}{}
}
}
p.EpgURL = epgURL
p.Channels = channels
return nil
}
func (p *Playlist) Reduce() {
channels := make([]Channel, 0)
programmes := make([]Programme, 0)
for _, channel := range p.Epg.Channels {
if _, ok := p.Channels[channel.ID]; !ok {
continue
}
channels = append(channels, channel)
}
for _, programme := range p.Epg.Programmes {
if _, ok := p.Channels[programme.Channel]; !ok {
continue
}
programmes = append(programmes, programme)
}
p.Epg.Channels = channels
p.Epg.Programmes = programmes
}
type Epg struct {
XMLName xml.Name `xml:"tv"`
Info string `xml:"generator-info-name,attr"`
Channels []Channel `xml:"channel"`
Programmes []Programme `xml:"programme"`
}
type Channel struct {
ID string `xml:"id,attr"`
DisplayName DisplayName `xml:"display-name"`
Icon Icon `xml:"icon"`
}
type DisplayName struct {
Lang string `xml:"lang,attr"`
Name string `xml:",chardata"`
}
type Icon struct {
Src string `xml:"src,attr"`
}
type Programme struct {
Start string `xml:"start,attr"`
Stop string `xml:"stop,attr"`
Channel string `xml:"channel,attr"`
Title Title `xml:"title,omitempty"`
Desc Desc `xml:"desc,omitempty"`
}
type Title struct {
Lang string `xml:"lang,attr"`
Title string `xml:",chardata"`
}
type Desc struct {
Lang string `xml:"lang,attr"`
Desc string `xml:",chardata"`
}
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