add support for CN region

Signed-off-by: Alex Li <zhiqinli@amazon.com>

Author: codingspirit

samples/Common.c

@@ -357,7 +357,12 @@ STATUS initializePeerConnection(PSampleConfiguration pSampleConfiguration, PRtcP
     configuration.iceTransportPolicy = ICE_TRANSPORT_POLICY_ALL;
 
     // Set the  STUN server
-    SNPRINTF(configuration.iceServers[0].urls, MAX_ICE_CONFIG_URI_LEN, KINESIS_VIDEO_STUN_URL, pSampleConfiguration->channelInfo.pRegion);
+    PCHAR pKinesisVideoStunUrl = KINESIS_VIDEO_STUN_URL;
+    if (STRSTR(pSampleConfiguration->channelInfo.pRegion, "cn-")) {
+        // Use CN region uri postfix instead
+        pKinesisVideoStunUrl = KINESIS_VIDEO_STUN_URL_CN;
+    }
+    SNPRINTF(configuration.iceServers[0].urls, MAX_ICE_CONFIG_URI_LEN, pKinesisVideoStunUrl, pSampleConfiguration->channelInfo.pRegion);
 
     if (pSampleConfiguration->useTurn) {
         // Set the URIs from the configuration

src/include/com/amazonaws/kinesis/video/webrtcclient/Include.h

@@ -623,7 +623,8 @@ extern "C" {
 /**
  * Parameterized string for KVS STUN Server
  */
-#define KINESIS_VIDEO_STUN_URL "stun:stun.kinesisvideo.%s.amazonaws.com:443"
+#define KINESIS_VIDEO_STUN_URL    "stun:stun.kinesisvideo.%s.amazonaws.com:443"
+#define KINESIS_VIDEO_STUN_URL_CN "stun:stun.kinesisvideo.%s.amazonaws.com.cn:443"
 
 /**
  * Default signaling SSL port

src/source/Signaling/ChannelInfo.c

@@ -125,8 +125,13 @@ STATUS createValidateChannelInfo(PChannelInfo pOrigChannelInfo, PChannelInfo* pp
         STRCPY(pCurPtr, pOrigChannelInfo->pControlPlaneUrl);
     } else {
         // Create a fully qualified URI
+        PCHAR pControlPlaneUriPostfix = CONTROL_PLANE_URI_POSTFIX;
+        if (STRSTR(pChannelInfo->pRegion, "cn-")) {
+            // Use CN region uri postfix instead
+            pControlPlaneUriPostfix = CONTROL_PLANE_URI_POSTFIX_CN;
+        }
         SNPRINTF(pCurPtr, MAX_CONTROL_PLANE_URI_CHAR_LEN, "%s%s.%s%s", CONTROL_PLANE_URI_PREFIX, KINESIS_VIDEO_SERVICE_NAME, pChannelInfo->pRegion,
-                 CONTROL_PLANE_URI_POSTFIX);
+                 pControlPlaneUriPostfix);
     }
 
     pChannelInfo->pControlPlaneUrl = pCurPtr;