openvidu-server: ignore tomcat from KurentoJsonRpcServer. Allow - and _ in customSessionId

openvidu-server/pom.xml

@@ -187,6 +187,11 @@
 					<groupId>org.springframework</groupId>
 					<artifactId>spring-websocket</artifactId>
 				</exclusion>
+				<exclusion>
+					<!-- Until kurento-java spring-boot dependency is updated to 2.2.4.RELEASE -->
+					<groupId>org.apache.tomcat.embed</groupId>
+					<artifactId>tomcat-embed-websocket</artifactId>
+				</exclusion>
 				<exclusion>
 					<groupId>org.slf4j</groupId>
 					<artifactId>slf4j-api</artifactId>

openvidu-server/src/main/java/io/openvidu/server/utils/FormatChecker.java

@@ -31,7 +31,7 @@ public class FormatChecker {
 
 	public boolean isValidCustomSessionId(String customSessionId) {
 		// Alphanumeric string
-		return customSessionId.matches("[a-zA-Z0-9]+");
+		return customSessionId.matches("[a-zA-Z0-9_-]+");
 	}
 
 }