365 lines
9.6 KiB
Go
365 lines
9.6 KiB
Go
package core
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import (
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_ "embed"
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"fmt"
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"io"
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"net"
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"net/http"
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"regexp"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/google/uuid"
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pwebrtc "github.com/pion/webrtc/v3"
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"github.com/bluenviron/mediamtx/internal/conf"
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"github.com/bluenviron/mediamtx/internal/defs"
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"github.com/bluenviron/mediamtx/internal/logger"
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"github.com/bluenviron/mediamtx/internal/protocols/httpserv"
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"github.com/bluenviron/mediamtx/internal/protocols/webrtc"
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"github.com/bluenviron/mediamtx/internal/restrictnetwork"
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)
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//go:embed webrtc_publish_index.html
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var webrtcPublishIndex []byte
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//go:embed webrtc_read_index.html
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var webrtcReadIndex []byte
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var (
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reWHIPWHEPNoID = regexp.MustCompile("^/(.+?)/(whip|whep)$")
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reWHIPWHEPWithID = regexp.MustCompile("^/(.+?)/(whip|whep)/(.+?)$")
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)
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func webrtcWriteError(ctx *gin.Context, statusCode int, err error) {
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ctx.JSON(statusCode, &defs.APIError{
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Error: err.Error(),
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})
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}
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func sessionLocation(publish bool, secret uuid.UUID) string {
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ret := ""
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if publish {
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ret += "whip"
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} else {
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ret += "whep"
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}
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ret += "/" + secret.String()
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return ret
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}
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type webRTCHTTPServerParent interface {
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logger.Writer
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generateICEServers() ([]pwebrtc.ICEServer, error)
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newSession(req webRTCNewSessionReq) webRTCNewSessionRes
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addSessionCandidates(req webRTCAddSessionCandidatesReq) webRTCAddSessionCandidatesRes
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deleteSession(req webRTCDeleteSessionReq) error
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}
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type webRTCHTTPServer struct {
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allowOrigin string
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pathManager *pathManager
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parent webRTCHTTPServerParent
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inner *httpserv.WrappedServer
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}
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func newWebRTCHTTPServer( //nolint:dupl
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address string,
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encryption bool,
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serverKey string,
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serverCert string,
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allowOrigin string,
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trustedProxies conf.IPsOrCIDRs,
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readTimeout conf.StringDuration,
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pathManager *pathManager,
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parent webRTCHTTPServerParent,
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) (*webRTCHTTPServer, error) {
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if encryption {
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if serverCert == "" {
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return nil, fmt.Errorf("server cert is missing")
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}
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} else {
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serverKey = ""
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serverCert = ""
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}
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s := &webRTCHTTPServer{
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allowOrigin: allowOrigin,
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pathManager: pathManager,
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parent: parent,
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}
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router := gin.New()
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router.SetTrustedProxies(trustedProxies.ToTrustedProxies()) //nolint:errcheck
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router.NoRoute(s.onRequest)
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network, address := restrictnetwork.Restrict("tcp", address)
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var err error
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s.inner, err = httpserv.NewWrappedServer(
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network,
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address,
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time.Duration(readTimeout),
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serverCert,
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serverKey,
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router,
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s,
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)
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if err != nil {
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return nil, err
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}
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return s, nil
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}
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func (s *webRTCHTTPServer) Log(level logger.Level, format string, args ...interface{}) {
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s.parent.Log(level, format, args...)
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}
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func (s *webRTCHTTPServer) close() {
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s.inner.Close()
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}
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func (s *webRTCHTTPServer) checkAuthOutsideSession(ctx *gin.Context, path string, publish bool) bool {
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ip := ctx.ClientIP()
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_, port, _ := net.SplitHostPort(ctx.Request.RemoteAddr)
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remoteAddr := net.JoinHostPort(ip, port)
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user, pass, hasCredentials := ctx.Request.BasicAuth()
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res := s.pathManager.getConfForPath(pathGetConfForPathReq{
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accessRequest: pathAccessRequest{
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name: path,
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query: ctx.Request.URL.RawQuery,
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publish: publish,
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ip: net.ParseIP(ip),
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user: user,
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pass: pass,
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proto: authProtocolWebRTC,
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},
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})
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if res.err != nil {
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if terr, ok := res.err.(*errAuthentication); ok {
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if !hasCredentials {
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ctx.Header("WWW-Authenticate", `Basic realm="mediamtx"`)
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ctx.Writer.WriteHeader(http.StatusUnauthorized)
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return false
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}
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s.Log(logger.Info, "connection %v failed to authenticate: %v", remoteAddr, terr.message)
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// wait some seconds to stop brute force attacks
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<-time.After(webrtcPauseAfterAuthError)
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webrtcWriteError(ctx, http.StatusUnauthorized, terr)
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return false
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}
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webrtcWriteError(ctx, http.StatusInternalServerError, res.err)
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return false
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}
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return true
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}
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func (s *webRTCHTTPServer) onWHIPOptions(ctx *gin.Context, path string, publish bool) {
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if !s.checkAuthOutsideSession(ctx, path, publish) {
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return
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}
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servers, err := s.parent.generateICEServers()
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if err != nil {
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webrtcWriteError(ctx, http.StatusInternalServerError, err)
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return
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}
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ctx.Writer.Header().Set("Access-Control-Allow-Methods", "OPTIONS, GET, POST, PATCH, DELETE")
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ctx.Writer.Header().Set("Access-Control-Allow-Headers", "Authorization, Content-Type, If-Match")
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ctx.Writer.Header().Set("Access-Control-Expose-Headers", "Link")
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ctx.Writer.Header()["Link"] = webrtc.LinkHeaderMarshal(servers)
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ctx.Writer.WriteHeader(http.StatusNoContent)
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}
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func (s *webRTCHTTPServer) onWHIPPost(ctx *gin.Context, path string, publish bool) {
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if ctx.Request.Header.Get("Content-Type") != "application/sdp" {
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webrtcWriteError(ctx, http.StatusBadRequest, fmt.Errorf("invalid Content-Type"))
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return
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}
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offer, err := io.ReadAll(ctx.Request.Body)
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if err != nil {
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return
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}
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ip := ctx.ClientIP()
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_, port, _ := net.SplitHostPort(ctx.Request.RemoteAddr)
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remoteAddr := net.JoinHostPort(ip, port)
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user, pass, _ := ctx.Request.BasicAuth()
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res := s.parent.newSession(webRTCNewSessionReq{
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pathName: path,
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remoteAddr: remoteAddr,
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query: ctx.Request.URL.RawQuery,
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user: user,
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pass: pass,
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offer: offer,
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publish: publish,
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})
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if res.err != nil {
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webrtcWriteError(ctx, res.errStatusCode, res.err)
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return
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}
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servers, err := s.parent.generateICEServers()
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if err != nil {
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webrtcWriteError(ctx, http.StatusInternalServerError, err)
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return
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}
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ctx.Writer.Header().Set("Content-Type", "application/sdp")
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ctx.Writer.Header().Set("Access-Control-Expose-Headers", "ETag, ID, Accept-Patch, Link, Location")
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ctx.Writer.Header().Set("ETag", "*")
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ctx.Writer.Header().Set("ID", res.sx.uuid.String())
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ctx.Writer.Header().Set("Accept-Patch", "application/trickle-ice-sdpfrag")
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ctx.Writer.Header()["Link"] = webrtc.LinkHeaderMarshal(servers)
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ctx.Writer.Header().Set("Location", sessionLocation(publish, res.sx.secret))
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ctx.Writer.WriteHeader(http.StatusCreated)
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ctx.Writer.Write(res.answer)
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}
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func (s *webRTCHTTPServer) onWHIPPatch(ctx *gin.Context, rawSecret string) {
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secret, err := uuid.Parse(rawSecret)
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if err != nil {
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webrtcWriteError(ctx, http.StatusBadRequest, fmt.Errorf("invalid secret"))
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return
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}
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if ctx.Request.Header.Get("Content-Type") != "application/trickle-ice-sdpfrag" {
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webrtcWriteError(ctx, http.StatusBadRequest, fmt.Errorf("invalid Content-Type"))
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return
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}
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byts, err := io.ReadAll(ctx.Request.Body)
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if err != nil {
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return
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}
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candidates, err := webrtc.ICEFragmentUnmarshal(byts)
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if err != nil {
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webrtcWriteError(ctx, http.StatusBadRequest, err)
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return
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}
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res := s.parent.addSessionCandidates(webRTCAddSessionCandidatesReq{
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secret: secret,
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candidates: candidates,
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})
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if res.err != nil {
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webrtcWriteError(ctx, http.StatusInternalServerError, res.err)
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return
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}
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ctx.Writer.WriteHeader(http.StatusNoContent)
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}
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func (s *webRTCHTTPServer) onWHIPDelete(ctx *gin.Context, rawSecret string) {
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secret, err := uuid.Parse(rawSecret)
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if err != nil {
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webrtcWriteError(ctx, http.StatusBadRequest, fmt.Errorf("invalid secret"))
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return
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}
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err = s.parent.deleteSession(webRTCDeleteSessionReq{
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secret: secret,
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})
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if err != nil {
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webrtcWriteError(ctx, http.StatusInternalServerError, err)
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return
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}
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ctx.Writer.WriteHeader(http.StatusOK)
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}
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func (s *webRTCHTTPServer) onPage(ctx *gin.Context, path string, publish bool) {
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if !s.checkAuthOutsideSession(ctx, path, publish) {
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return
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}
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ctx.Writer.Header().Set("Cache-Control", "max-age=3600")
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ctx.Writer.Header().Set("Content-Type", "text/html")
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ctx.Writer.WriteHeader(http.StatusOK)
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if publish {
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ctx.Writer.Write(webrtcPublishIndex)
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} else {
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ctx.Writer.Write(webrtcReadIndex)
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}
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}
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func (s *webRTCHTTPServer) onRequest(ctx *gin.Context) {
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ctx.Writer.Header().Set("Access-Control-Allow-Origin", s.allowOrigin)
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ctx.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
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// preflight requests
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if ctx.Request.Method == http.MethodOptions &&
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ctx.Request.Header.Get("Access-Control-Request-Method") != "" {
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ctx.Writer.Header().Set("Access-Control-Allow-Methods", "OPTIONS, GET, POST, PATCH, DELETE")
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ctx.Writer.Header().Set("Access-Control-Allow-Headers", "Authorization, Content-Type, If-Match")
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ctx.Writer.WriteHeader(http.StatusNoContent)
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return
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}
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// WHIP/WHEP, outside session
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if m := reWHIPWHEPNoID.FindStringSubmatch(ctx.Request.URL.Path); m != nil {
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switch ctx.Request.Method {
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case http.MethodOptions:
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s.onWHIPOptions(ctx, m[1], m[2] == "whip")
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case http.MethodPost:
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s.onWHIPPost(ctx, m[1], m[2] == "whip")
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case http.MethodGet, http.MethodHead, http.MethodPut:
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// RFC draft-ietf-whip-09
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// The WHIP endpoints MUST return an "405 Method Not Allowed" response
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// for any HTTP GET, HEAD or PUT requests
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webrtcWriteError(ctx, http.StatusMethodNotAllowed, fmt.Errorf("method not allowed"))
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}
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return
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}
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// WHIP/WHEP, inside session
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if m := reWHIPWHEPWithID.FindStringSubmatch(ctx.Request.URL.Path); m != nil {
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switch ctx.Request.Method {
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case http.MethodPatch:
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s.onWHIPPatch(ctx, m[3])
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case http.MethodDelete:
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s.onWHIPDelete(ctx, m[3])
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}
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return
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}
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// static resources
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if ctx.Request.Method == http.MethodGet {
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switch {
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case ctx.Request.URL.Path == "/favicon.ico":
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case len(ctx.Request.URL.Path) >= 2:
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switch {
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case len(ctx.Request.URL.Path) > len("/publish") && strings.HasSuffix(ctx.Request.URL.Path, "/publish"):
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s.onPage(ctx, ctx.Request.URL.Path[1:len(ctx.Request.URL.Path)-len("/publish")], true)
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case ctx.Request.URL.Path[len(ctx.Request.URL.Path)-1] != '/':
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ctx.Writer.Header().Set("Location", httpserv.LocationWithTrailingSlash(ctx.Request.URL))
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ctx.Writer.WriteHeader(http.StatusMovedPermanently)
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default:
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s.onPage(ctx, ctx.Request.URL.Path[1:len(ctx.Request.URL.Path)-1], false)
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}
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}
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return
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}
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}
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