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main.go
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main.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"io"
"os"
"path"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
"crypto/tls"
"log"
"net/http"
"github.com/glimesh/broadcast-box/internal/networktest"
"github.com/glimesh/broadcast-box/internal/webrtc"
"github.com/joho/godotenv"
)
const (
envFileProd = ".env.production"
envFileDev = ".env.development"
networkTestIntroMessage = "\033[0;33mNETWORK_TEST_ON_START is enabled. If the test fails Broadcast Box will exit.\nSee the README for how to debug or disable NETWORK_TEST_ON_START\033[0m"
networkTestSuccessMessage = "\033[0;32mNetwork Test passed.\nHave fun using Broadcast Box.\033[0m"
networkTestFailedMessage = "\033[0;31mNetwork Test failed.\n%s\nPlease see the README and join Discord for help\033[0m"
)
var (
webhookURL string
webhookTimeout int
)
var noBuildDirectoryErr = errors.New("\033[0;31mBuild directory does not exist, run `npm install` and `npm run build` in the web directory.\033[0m")
type (
whepLayerRequestJSON struct {
MediaId string `json:"mediaId"`
EncodingId string `json:"encodingId"`
}
)
func logHTTPError(w http.ResponseWriter, err string, code int) {
log.Println(err)
http.Error(w, err, code)
}
func validateStreamKey(streamKey string) bool {
return regexp.MustCompile(`^[a-zA-Z0-9_\-\.~]+$`).MatchString(streamKey)
}
func extractBearerToken(authHeader string) (string, bool) {
const bearerPrefix = "Bearer "
if strings.HasPrefix(authHeader, bearerPrefix) {
return strings.TrimPrefix(authHeader, bearerPrefix), true
}
return "", false
}
func whipHandler(res http.ResponseWriter, r *http.Request) {
if r.Method == "DELETE" {
return
}
streamKeyHeader := r.Header.Get("Authorization")
if streamKeyHeader == "" {
logHTTPError(res, "Authorization was not set", http.StatusBadRequest)
return
}
streamKey, ok := extractBearerToken(streamKeyHeader)
if !ok || !validateStreamKey(streamKey) {
logHTTPError(res, "Invalid stream key format", http.StatusBadRequest)
return
}
// Prepare webhook payload
payload := prepareWebhookPayload("publish", streamKey, r)
statusCode, err := handleWebhook(payload)
if err != nil {
logHTTPError(res, err.Error(), statusCode)
return
}
offer, err := io.ReadAll(r.Body)
if err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
return
}
answer, err := webrtc.WHIP(string(offer), streamKey)
if err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
return
}
res.Header().Add("Location", "/api/whip")
res.Header().Add("Content-Type", "application/sdp")
res.WriteHeader(http.StatusCreated)
fmt.Fprint(res, answer)
}
func whepHandler(res http.ResponseWriter, req *http.Request) {
streamKeyHeader := req.Header.Get("Authorization")
if streamKeyHeader == "" {
logHTTPError(res, "Authorization was not set", http.StatusBadRequest)
return
}
streamKey, ok := extractBearerToken(streamKeyHeader)
if !ok || !validateStreamKey(streamKey) {
logHTTPError(res, "Invalid stream key format", http.StatusBadRequest)
return
}
// Prepare webhook payload
payload := prepareWebhookPayload("view", streamKey, req)
statusCode, err := handleWebhook(payload)
if err != nil {
logHTTPError(res, err.Error(), statusCode)
return
}
offer, err := io.ReadAll(req.Body)
if err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
return
}
answer, whepSessionId, err := webrtc.WHEP(string(offer), streamKey)
if err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
return
}
apiPath := req.Host + strings.TrimSuffix(req.URL.RequestURI(), "whep")
res.Header().Add("Link", `<`+apiPath+"sse/"+whepSessionId+`>; rel="urn:ietf:params:whep:ext:core:server-sent-events"; events="layers"`)
res.Header().Add("Link", `<`+apiPath+"layer/"+whepSessionId+`>; rel="urn:ietf:params:whep:ext:core:layer"`)
res.Header().Add("Location", "/api/whep")
res.Header().Add("Content-Type", "application/sdp")
res.WriteHeader(http.StatusCreated)
fmt.Fprint(res, answer)
}
func whepServerSentEventsHandler(res http.ResponseWriter, req *http.Request) {
res.Header().Set("Content-Type", "text/event-stream")
res.Header().Set("Cache-Control", "no-cache")
res.Header().Set("Connection", "keep-alive")
vals := strings.Split(req.URL.RequestURI(), "/")
whepSessionId := vals[len(vals)-1]
layers, err := webrtc.WHEPLayers(whepSessionId)
if err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
return
}
fmt.Fprint(res, "event: layers\n")
fmt.Fprintf(res, "data: %s\n", string(layers))
fmt.Fprint(res, "\n\n")
}
func whepLayerHandler(res http.ResponseWriter, req *http.Request) {
var r whepLayerRequestJSON
if err := json.NewDecoder(req.Body).Decode(&r); err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
return
}
vals := strings.Split(req.URL.RequestURI(), "/")
whepSessionId := vals[len(vals)-1]
if err := webrtc.WHEPChangeLayer(whepSessionId, r.EncodingId); err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
return
}
}
func statusHandler(res http.ResponseWriter, req *http.Request) {
res.Header().Add("Content-Type", "application/json")
if err := json.NewEncoder(res).Encode(webrtc.GetStreamStatuses()); err != nil {
logHTTPError(res, err.Error(), http.StatusBadRequest)
}
}
func indexHTMLWhenNotFound(fs http.FileSystem) http.Handler {
fileServer := http.FileServer(fs)
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
_, err := fs.Open(path.Clean(req.URL.Path)) // Do not allow path traversals.
if errors.Is(err, os.ErrNotExist) {
http.ServeFile(resp, req, "./web/build/index.html")
return
}
fileServer.ServeHTTP(resp, req)
})
}
func corsHandler(next func(w http.ResponseWriter, r *http.Request)) http.HandlerFunc {
return func(res http.ResponseWriter, req *http.Request) {
res.Header().Set("Access-Control-Allow-Origin", "*")
res.Header().Set("Access-Control-Allow-Methods", "*")
res.Header().Set("Access-Control-Allow-Headers", "*")
res.Header().Set("Access-Control-Expose-Headers", "*")
if req.Method != http.MethodOptions {
next(res, req)
}
}
}
func main() {
loadConfigs := func() error {
if os.Getenv("APP_ENV") == "development" {
log.Println("Loading `" + envFileDev + "`")
return godotenv.Load(envFileDev)
} else {
log.Println("Loading `" + envFileProd + "`")
if err := godotenv.Load(envFileProd); err != nil {
return err
}
if _, err := os.Stat("./web/build"); os.IsNotExist(err) && os.Getenv("DISABLE_FRONTEND") == "" {
return noBuildDirectoryErr
}
return nil
}
}
if err := loadConfigs(); err != nil {
log.Println("Failed to find config in CWD, changing CWD to executable path")
exePath, err := os.Executable()
if err != nil {
log.Fatal(err)
}
if err = os.Chdir(filepath.Dir(exePath)); err != nil {
log.Fatal(err)
}
if err = loadConfigs(); err != nil {
log.Fatal(err)
}
}
webrtc.Configure()
if os.Getenv("NETWORK_TEST_ON_START") == "true" {
fmt.Println(networkTestIntroMessage) //nolint
go func() {
time.Sleep(time.Second * 5)
if networkTestErr := networktest.Run(whepHandler); networkTestErr != nil {
fmt.Printf(networkTestFailedMessage, networkTestErr.Error())
os.Exit(1)
} else {
fmt.Println(networkTestSuccessMessage) //nolint
}
}()
}
httpsRedirectPort := "80"
if val := os.Getenv("HTTPS_REDIRECT_PORT"); val != "" {
httpsRedirectPort = val
}
if os.Getenv("HTTPS_REDIRECT_PORT") != "" || os.Getenv("ENABLE_HTTP_REDIRECT") != "" {
go func() {
redirectServer := &http.Server{
Addr: ":" + httpsRedirectPort,
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "https://"+r.Host+r.URL.String(), http.StatusMovedPermanently)
}),
}
log.Println("Running HTTP->HTTPS redirect Server at :" + httpsRedirectPort)
log.Fatal(redirectServer.ListenAndServe())
}()
}
webhookURL = os.Getenv("WEBHOOK_URL")
webhookTimeout, _ := strconv.Atoi(os.Getenv("WEBHOOK_TIMEOUT"))
if webhookTimeout == 0 {
webhookTimeout = 5000 // Default to 5 seconds if not set or invalid
}
mux := http.NewServeMux()
if os.Getenv("DISABLE_FRONTEND") == "" {
mux.Handle("/", indexHTMLWhenNotFound(http.Dir("./web/build")))
}
mux.HandleFunc("/api/whip", corsHandler(whipHandler))
mux.HandleFunc("/api/whep", corsHandler(whepHandler))
mux.HandleFunc("/api/sse/", corsHandler(whepServerSentEventsHandler))
mux.HandleFunc("/api/layer/", corsHandler(whepLayerHandler))
if os.Getenv("DISABLE_STATUS") == "" {
mux.HandleFunc("/api/status", corsHandler(statusHandler))
}
server := &http.Server{
Handler: mux,
Addr: os.Getenv("HTTP_ADDRESS"),
}
tlsKey := os.Getenv("SSL_KEY")
tlsCert := os.Getenv("SSL_CERT")
if tlsKey != "" && tlsCert != "" {
server.TLSConfig = &tls.Config{
Certificates: []tls.Certificate{},
}
cert, err := tls.LoadX509KeyPair(tlsCert, tlsKey)
if err != nil {
log.Fatal(err)
}
server.TLSConfig.Certificates = append(server.TLSConfig.Certificates, cert)
log.Println("Running HTTPS Server at `" + os.Getenv("HTTP_ADDRESS") + "`")
log.Fatal(server.ListenAndServeTLS("", ""))
} else {
log.Println("Running HTTP Server at `" + os.Getenv("HTTP_ADDRESS") + "`")
log.Fatal(server.ListenAndServe())
}
}
func prepareWebhookPayload(action, streamKey string, r *http.Request) webrtc.WebhookPayload {
// Convert url.Values to map[string]string
queryParams := make(map[string]string)
for k, v := range r.URL.Query() {
if len(v) > 0 {
queryParams[k] = v[0]
}
}
return webrtc.WebhookPayload{
Action: action,
StreamKey: streamKey,
IP: getIPAddress(r),
BearerToken: streamKey,
QueryParams: queryParams,
UserAgent: r.UserAgent(),
}
}
func handleWebhook(payload webrtc.WebhookPayload) (int, error) {
if webhookURL == "" {
return http.StatusOK, nil
}
statusCode, err := webrtc.CallWebhook(webhookURL, webhookTimeout, payload)
if err != nil {
return http.StatusInternalServerError, fmt.Errorf("Webhook call failed: %w", err)
}
if statusCode == http.StatusUnauthorized || statusCode == http.StatusForbidden {
return statusCode, fmt.Errorf("Webhook denied access")
}
if statusCode != http.StatusOK {
return statusCode, fmt.Errorf("Webhook returned unexpected status")
}
return http.StatusOK, nil
}
func getIPAddress(r *http.Request) string {
ip := r.Header.Get("X-Forwarded-For")
if ip == "" {
ip = r.RemoteAddr
}
return ip
}