Testing an API endpoint with Lambda + API Gateway - amazon-web-services

Question

I'm trying to create and test an API endpoint using AWS Lambda and API Gateway. I can test my function successfully using Lambda Test, but when I try to test my endpoint it gives:
{
"message": "Internal server error"
}
This is my handler class:
package com.amazonaws.lambda.gandhi.conversion.api;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.lang3.RandomStringUtils;
import com.amazonaws.lambda.gandhi.conversion.api.Response.AuthClientCredentialResponse;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.lambda.gandhi.conversion.api.utils.ClientAuthPOJO;
public class AuthClientCredentialServiceHandler implements RequestHandler<ClientAuthPOJO, Object> {
private AuthClientCredentialResponse authClientCredentialResponse;
private static final SecureRandom RANDOM = new SecureRandom();
public static int MAX_CLIENT_KEY = 10;
public static int CLIENT_SECRET_LENGTH = 69;
#Override
public AuthClientCredentialResponse handleRequest(ClientAuthPOJO clientIdSecret, Context context) {
String clientSecret;
try {
context.getLogger().log("Input: "
+ clientIdSecret);
String clientId = clientIdSecret.getClientId();
clientSecret = generateClientSecretKey();
Map<String, String> clientCredsMap = getClientCredentials();
if (clientCredsMap.size() > MAX_CLIENT_KEY) {
throw new RuntimeException(String.format("Max limit is %d, Please delete some keys", MAX_CLIENT_KEY));
}
clientCredsMap.forEach((k, v) -> {
if (clientId.equals(k)) {
throw new RuntimeException("Client Already exists");
}
});
storeClientCredentials(clientId, clientSecret);
AuthClientCredentialResponse authClientCredentialResponse = AuthClientCredentialResponse.builder().success(
true).clientId(clientId).clientSecret(clientSecret).build();
this.authClientCredentialResponse = authClientCredentialResponse;
} catch (Exception e) {
throw new RuntimeException(
"Failed to generate client secret: "
+ e.getMessage());
}
return authClientCredentialResponse;
}
private String generateClientSecretKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
String clientSecret = RandomStringUtils.randomAlphanumeric(CLIENT_SECRET_LENGTH);
System.out.printf("clientSecret: %s%n", clientSecret);
return clientSecret;
}
private void storeClientCredentials(String clientId, String clientSecret) throws IOException {
/*
* TODO:
* Some logic to store clientCredentials to a file or DB. Decide later.
*/
System.out.println("temp ClientCredentials stored");
}
public Map<String, String> getClientCredentials() throws IOException {
/*
* TODO:
* Some logic to fetch clientCredentials from file or DB. Decide later.
*/
Map<String, String> clientCredMap = new HashMap<String, String>();
clientCredMap.put("1", "secretKey1");
clientCredMap.put("2", "secretKey2");
clientCredMap.put("3", "secretKey3");
clientCredMap.put("4", "secretKey4");
return clientCredMap;
}
}
My input class:
package com.amazonaws.lambda.gandhi.conversion.api.utils;
public class ClientAuthPOJO {
String clientId;
String clientSecret;
public String getClientId() {
return clientId;
}
public void setClientId(String clientId) {
this.clientId = clientId;
}
public String getClientSecret() {
return clientSecret;
}
public void setClientSecret(String clientSecret) {
this.clientSecret = clientSecret;
}
public ClientAuthPOJO(String clientId, String clientSecret) {
super();
this.clientId = clientId;
this.clientSecret = clientSecret;
}
public ClientAuthPOJO() {
}
}
My test object in lambda:
My test for endpoint in API Gateway:
Can someone please help me figure out the problem in creating the function or API Gateway?
Edit:
When I check the logs, I found that the parameters to the functions (clientId and clientSecret) are null. So there seems to be some problem in the way I'm sending my request body.