Skip some checks when BUNDLE group value is found

Resolves #2621

peerconnection_go_test.go

@@ -1399,6 +1399,7 @@ func TestTransceiverCreatedByRemoteSdpHasSameCodecOrderAsRemote(t *testing.T) {
 o=- 4596489990601351948 2 IN IP4 127.0.0.1
 s=-
 t=0 0
+a=group:BUNDLE video-0 video-1
 m=video 60323 UDP/TLS/RTP/SAVPF 98 94 106
 a=ice-ufrag:1/MvHwjAyVf27aLu
 a=ice-pwd:3dBU7cFOBl120v33cynDvN1E
@@ -1459,6 +1460,7 @@ a=fmtp:125 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01
 o=- 4596489990601351948 2 IN IP4 127.0.0.1
 s=-
 t=0 0
+a=group:BUNDLE video-0 video-1
 m=video 60323 UDP/TLS/RTP/SAVPF 98 106
 a=ice-ufrag:1/MvHwjAyVf27aLu
 a=ice-pwd:3dBU7cFOBl120v33cynDvN1E

sdp.go

@@ -709,8 +709,13 @@ func extractFingerprint(desc *sdp.SessionDescription) (string, string, error) {
 		return "", "", ErrSessionDescriptionNoFingerprint
 	}
 
-	for _, m := range fingerprints {
-		if m != fingerprints[0] {
+	// https://github.com/pion/webrtc/issues/2621
+	groupAttribue, _ := desc.Attribute(sdp.AttrKeyGroup)
+
+	isBundled := strings.Contains(groupAttribue, "BUNDLE")
+
+	if !isBundled {
+		if len(fingerprints) != 1 {
 			return "", "", ErrSessionDescriptionConflictingFingerprints
 		}
 	}
@@ -769,14 +774,15 @@ func extractICEDetails(desc *sdp.SessionDescription, log logging.LeveledLogger)
 		return "", "", nil, ErrSessionDescriptionMissingIcePwd
 	}
 
-	for _, m := range remoteUfrags {
-		if m != remoteUfrags[0] {
-			return "", "", nil, ErrSessionDescriptionConflictingIceUfrag
-		}
-	}
+	// https://github.com/pion/webrtc/issues/2621
+	groupAttribue, _ := desc.Attribute(sdp.AttrKeyGroup)
+
+	isBundled := strings.Contains(groupAttribue, "BUNDLE")
 
-	for _, m := range remotePwds {
-		if m != remotePwds[0] {
+	if !isBundled {
+		if len(remoteUfrags) != 1 {
+			return "", "", nil, ErrSessionDescriptionConflictingIceUfrag
+		} else if len(remotePwds) != 1 {
 			return "", "", nil, ErrSessionDescriptionConflictingIcePwd
 		}
 	}