Reland "Adding a restriction for legal RID values."

This is a reland of 07f3279a730980583403b78c3762c5d246d1d9be

Original change's description:
> Adding a restriction for legal RID values.
>
> According to the spec, RID values should be constrained to only
> alpha-numeric values. This was not enforced in our implementation to
> allow for more flexibility.
> It has been brought to our attention that some values that we currently
> consider legal (such as the '~', '=' ';' characters) might cause confusion
> with the simulcast syntax that uses these characters to indicate other
> meanings.
> What's worse, is that some characters, when used in RIDs (such as
> \u{1f937} \u{1f4a9} and \u{1f926}) cause uncontrollable laughter for some
> users which might also be a health hazard.
> This change resolves these issues by restricting RIDs to alpha-numeric.
>
> Bug: webrtc:10491
> Change-Id: I16e262c87525d0289764beacd098e1525a355463
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/132061
> Reviewed-by: Steve Anton <steveanton@webrtc.org>
> Commit-Queue: Amit Hilbuch <amithi@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#27499}

TBR=steveanton@webrtc.org

Bug: webrtc:10491
Change-Id: I856581306a9258480ee9184f12b55c2a23dd8636
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131983
Commit-Queue: Amit Hilbuch <amithi@webrtc.org>
Reviewed-by: Amit Hilbuch <amithi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27530}

pc/BUILD.gn

@@ -208,6 +208,7 @@ rtc_static_library("peerconnection") {
     "../logging:rtc_event_log_impl_output",
     "../media:rtc_data",
     "../media:rtc_media_base",
+    "../modules/rtp_rtcp:rtp_rtcp_format",
     "../p2p:rtc_p2p",
     "../rtc_base",
     "../rtc_base:checks",

pc/peer_connection.cc

@@ -24,11 +24,14 @@
 #include "api/jsep_session_description.h"
 #include "api/media_stream_proxy.h"
 #include "api/media_stream_track_proxy.h"
+#include "api/rtc_error.h"
+#include "api/rtp_parameters.h"
 #include "api/uma_metrics.h"
 #include "call/call.h"
 #include "logging/rtc_event_log/ice_logger.h"
 #include "logging/rtc_event_log/output/rtc_event_log_output_file.h"
 #include "logging/rtc_event_log/rtc_event_log.h"
+#include "media/base/rid_description.h"
 #include "media/sctp/sctp_transport.h"
 #include "pc/audio_rtp_receiver.h"
 #include "pc/audio_track.h"
@@ -1547,6 +1550,14 @@ PeerConnection::AddTransceiver(
         "RIDs must be provided for either all or none of the send encodings.");
   }
 
+  if (num_rids > 0 && absl::c_any_of(init.send_encodings,
+                                     [](const RtpEncodingParameters& encoding) {
+                                       return !IsLegalRsidName(encoding.rid);
+                                     })) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Invalid RID value provided.");
+  }
+
   if (absl::c_any_of(init.send_encodings,
                      [](const RtpEncodingParameters& encoding) {
                        return encoding.ssrc.has_value();

pc/peer_connection_simulcast_unittest.cc

@@ -15,6 +15,8 @@
 #include "api/audio_codecs/builtin_audio_decoder_factory.h"
 #include "api/audio_codecs/builtin_audio_encoder_factory.h"
 #include "api/create_peerconnection_factory.h"
+#include "api/media_types.h"
+#include "api/rtc_error.h"
 #include "api/rtp_transceiver_interface.h"
 #include "api/uma_metrics.h"
 #include "api/video_codecs/builtin_video_decoder_factory.h"
@@ -254,6 +256,16 @@ TEST_F(PeerConnectionSimulcastTests, MustSupplyAllOrNoRidsInSimulcast) {
   EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, error.error().type());
 }
 
+// Validates that an error is returned when illegal RIDs are supplied.
+TEST_F(PeerConnectionSimulcastTests, ChecksForIllegalRidValues) {
+  auto pc_wrapper = CreatePeerConnectionWrapper();
+  auto pc = pc_wrapper->pc();
+  auto layers = CreateLayers({"f", "h", "~q"}, true);
+  auto init = CreateTransceiverInit(layers);
+  auto error = pc->AddTransceiver(cricket::MEDIA_TYPE_VIDEO, init);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, error.error().type());
+}
+
 // Validates that a single RID is removed from the encoding layer.
 TEST_F(PeerConnectionSimulcastTests, SingleRidIsRemovedFromSessionDescription) {
   auto pc = CreatePeerConnectionWrapper();

pc/sdp_serializer.cc

@@ -16,6 +16,7 @@
 
 #include "absl/algorithm/container.h"
 #include "api/jsep.h"
+#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/string_encode.h"
 #include "rtc_base/string_to_number.h"
@@ -328,6 +329,10 @@ RTCErrorOr<RidDescription> SdpSerializer::DeserializeRidDescription(
     return ParseError("Invalid RID Description format. Too many arguments.");
   }
 
+  if (!IsLegalRsidName(tokens[0])) {
+    return ParseError("Invalid RID value: " + tokens[0] + ".");
+  }
+
   if (tokens[1] != kSendDirection && tokens[1] != kReceiveDirection) {
     return ParseError("Invalid RID direction. Supported values: send / recv.");
   }

pc/sdp_serializer_unittest.cc

@@ -469,6 +469,10 @@ const char* kRidDescriptionMalformedStrings[] = {
     "1 send pt=",
     "1 send pt=abc",
     "1 recv ;;",
+    "~1 recv",
+    "1$2 send",
+    "1=2 send",
+    "1* send",
 };
 
 INSTANTIATE_TEST_SUITE_P(RidDescriptionDeserializationErrors,