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server.go
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server.go
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// Copyright 2020 David Sheets
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"time"
)
func run(config configuration) {
certFile := absolutize(certFile)
keyFile := absolutize(keyFile)
jsonFile := absolutize(jsonFile)
headersDir := absolutize(headersDir)
ensureTLSReady(certFile, keyFile)
serveSdpForever(config, certFile, keyFile, jsonFile, headersDir)
}
func absolutize(fsPath string) string {
execPath, err := os.Executable()
if err != nil {
log.Fatalf("Could not get executable path: %s", err)
}
return path.Join(filepath.Dir(execPath), fsPath)
}
func serveSdpForever(config configuration, certFile, keyFile, jsonFile, headersDir string) {
http.HandleFunc("/",
func(w http.ResponseWriter, req *http.Request) {
addHeaders(w.Header(), headersDir)
now := nowUnixMilliseconds()
w.Header().Add("X-Server-Time", strconv.FormatInt(now, 10))
writeBody(w, jsonFile)
log.Printf("Served request for %s", req.URL.Path)
})
log.Print("Serving LG TV SDP initservices...")
if config.serviceStarted != nil {
config.serviceStarted <- nil
}
err := http.ListenAndServeTLS(config.bindAddress.String()+":443", certFile, keyFile, nil)
log.Fatal(err)
}
func addHeaders(hs http.Header, dir string) {
files, err := ioutil.ReadDir(dir)
if err != nil {
if os.IsNotExist(err) {
log.Printf("Creating header directory %s", dir)
err = os.Mkdir(dir, 0755)
if err != nil {
log.Printf("Could not create header directory %s: %s", dir, err)
}
} else {
log.Printf("Skipping custom headers in dir %s: %s", dir, err)
}
return
}
for _, fileInfo := range files {
name := fileInfo.Name()
value, err := ioutil.ReadFile(path.Join(dir, name))
if err != nil {
log.Printf("Skipping header %s: %s", name, err)
} else {
hs.Add(name, strings.TrimSuffix(string(value), "\n"))
}
}
}
func writeBody(w io.Writer, path string) {
body, err := ioutil.ReadFile(path)
if err != nil {
if os.IsNotExist(err) {
log.Printf("Creating empty body file %s", path)
err = ioutil.WriteFile(path, nil, 0600)
if err != nil {
log.Printf("Could not create empty body file %s: %s", path, err)
}
} else {
log.Printf("Skipping body %s: %s", path, err)
return
}
}
n, err := w.Write(body)
if err != nil {
log.Printf("Error writing body (%d / %d bytes written): %s", n, len(body), err)
}
}
func nowUnixMilliseconds() int64 {
return time.Now().UnixNano() / int64(time.Millisecond)
}