{
    "api": "enableAutoSnapshotAndUpload",
    "params" : {
    "'enable": 1, //Start/stop automatic screenshot, int, required. Field values: 0: stop, and 1: start. The passed value shall not be empty, and bool values (true and false) are supported.
    "intervalS": 1, //Screenshot interval, int, optional. The interval is expressed in second, with the default value of 3 seconds and the minimum interval of 1 second. The passed value for the field shall not be empty. If it is less than 1, the minimum value of 1 second will be taken.
    "streamType": 0, //Stream type, int, optional. Field values: 0: BigStream, and 2: SubStream. The passed value shall not be empty. Default behavior: If this field is not passed when starting a screenshot, the starting will not take effect. If this field is not passed, all tasks will stop when a screenshot is stopped.
    "extraInfo": "customized messages" //Screenshot upload additional information, string, optional. This information will be sent to your business backend through a server-side callback.
    }

}

//In the calculation formula of Sign, the key is the encryption key for calculating the Sign.
Sign = base64 (hmacsha256(key, body))

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
//# Feature: Verification of the third-party callback sign
//# Parameters:
//# Key: The key configured in the console
//# Body: The body returned by Tencent Cloud callback
//# Sign: The sign returned by Tencent Cloud callback
//# Returned values:
//# Status OK indicates that it has passed the verification, and FAIL indicates that it has failed the verification. For specific reasons, see Info
//# Info: The information of pass/fail

		
									
public class checkSign {
    public static String getResultSign(String key, String body) throws
						
Exception {
        Mac hmacSha256 = Mac.getInstance("HmacSHA256");        
        SecretKeySpec secret_key = new SecretKeySpec(key.getBytes(),
"HmacSHA256");
        hmacSha256.initialize(secret_key);
		return					
Base64.getEncoder().encodeToString(hmacSha256.doFinal(body.getBytes()));
    }					
    public static void main(String[] args) throws Exception {
        String key = "123654";  
        String body = "{\\n" + "\\t\\"EventGroupId\\":\\t2,\\n" +	
"\\t\\"EventType\\":\\t204,\\n" + "\\t\\"CallbackTs\\":\\t1664209748188,\\n" +
"\\t\\"EventInfo\\":\\t{\\n" + "\\t\\t\\"RoomId\\":\\t8489,\\n" +
"\\t\\t\\"EventTs\\":\\t1664209748,\\n" + "\\t\\t\\"EventMsTs\\":\\t1664209748180,\\n" +
"\\t\\t\\"UserId\\":\\t\\"user_85034614\\",\\n" + "\\t\\t\\"Reason\\":\\t0\\n" + "\\t}\\n" +
"}";
						
        String Sign = "kkoFeO3Oh2ZHnjtg8tEAQhtXK16/KI05W3BQff8IvGA=";  
        String resultSign = obtainResultSignature(key, body);
        
        
        if (resultSign.equals(Sign)) {
            System.out.println("{'Status': 'OK', 'Info': 'Verification passed'}");
        } else {
            System.out.println("{'Status': 'FAIL', 'Info': 'Verification failed'}");
        }
    }
}