Outgoing webhook with java

Radha Rajendran 61

I was going through the below link to create a outgoing web hook. But I couldn't find any example for java.
https://learn.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/add-outgoing-webhook?tabs=urljsonpayload%2Cdotnet

Can we create a outgoing web hook using java, if so can you share some sample link.

Thanks,
Radha

Yuki Sun-MSFT 41,016 Reputation points

2022-03-29T01:51:11.72+00:00

Hi @Radha Rajendran ，

As the "office-teams-windows-itpro" tag is for general questions about the Teams desktop client on Windows, while from the description your question is more related to development, I'll change the tag to "office-teams-app-dev" instead. Thanks for your understanding.

1 answer

Nivedipa-MSFT 2,896 Reputation points Microsoft Vendor

2022-03-29T07:56:41.713+00:00

@Radha Rajendran - Currently there is no any sample available in java to create a outgoing webhook.
You can refer below sample for reference which is in C# and nodejs.
https://github.com/OfficeDev/Microsoft-Teams-Samples/tree/main/samples/outgoing-webhook

Thanks,
Nivedipa

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Radha Rajendran 61 Reputation points

2022-03-29T14:11:13.823+00:00

@Nivedipa-MSFT , I have already refered that link and created the project, But am getting the below error and its not hitting my API.

"Sorry, there was a problem encountered with your request"

Below is the java code,

public TeamsResponse getSampleResponse(String authorization, SampleRequest sampleRequest) {
try {
String secret = "*****";//secrete key
String algorithm = "HmacSHA256";
byte[] key = secret.getBytes();
SecretKeySpec signingKey = new SecretKeySpec(secret.getBytes(), algorithm);
Mac mac = Mac.getInstance(algorithm);
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(sampleRequest.toString().getBytes());
String result = new String(Base64.encodeBase64(rawHmac));
logger.info("generated HMAc : {}", result);
if(authorization.equals(result))
logger.info("Authorization validated");
else
logger.info("Authorization NOT VALIDATED");
}catch (Exception e){
logger.error("exception occured while calculating HMAC : {}", e.toString());
}
return getTeamResponse(sampleRequest.getText());
}

private TeamsResponse getTeamResponse(String txt){ TeamsResponse response = new TeamsResponse(); response.setType("message"); response.setText("Sample Response : "+txt); return response; }

Let me know what needs to be done to fix the issue.

Nivedipa-MSFT 2,896 Reputation points Microsoft Vendor

2022-03-31T07:50:49.967+00:00

@Radha Rajendran - In your request there is some configuration issue. Could you please check again. Have you tried C# or NodeJS code. Is it working at your end?

Radha Rajendran 61 Reputation points

2022-04-01T15:27:45.533+00:00

@Nivedipa-MSFT , that issue is solved.

However, HMAC is not validated

below is the Java HMAC code,

METHOD 1:

String secret = "*";//Secret
String algorithm = "HmacSHA256";
ObjectMapper mapper = new ObjectMapper();
byte[] key = secret.getBytes();
SecretKeySpec signingKey = new SecretKeySpec(secret.getBytes(), algorithm);
Mac mac = Mac.getInstance(algorithm);
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(mapper.writeValueAsString(sampleRequest).getBytes());
String result = new String(Base64.encodeBase64(rawHmac));
logger.info("generated HMAc : {}", result);
if (authorization.equals(result))
logger.info("Authorization validated");
else
logger.info("Authorization NOT VALIDATED");

METHOD 2:
String secret = "*";//Secret
String algorithm = "HmacSHA256";
ObjectMapper mapper = new ObjectMapper();
byte[] serializedPayloadBytes = mapper.writeValueAsString(sampleRequest).getBytes(StandardCharsets.UTF_8);
byte[] key = Base64.decodeBase64(secret);
SecretKeySpec signingKey = new SecretKeySpec(key, algorithm);
Mac mac = Mac.getInstance(algorithm);
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(serializedPayloadBytes);
String result = new String(Base64.encodeBase64(rawHmac));
result = "HMAC "+result;
if (authorization.equals(result))
logger.info("Authorization validated");
else
logger.info("Authorization NOT VALIDATED");

Request you guide on HMAC validation part for JAVA.

Nivedipa-MSFT 2,896 Reputation points Microsoft Vendor

2022-04-13T06:04:51.53+00:00

Could you please refer below doc:

https://community.shopify.com/c/shopify-apis-and-sdks/java-hmac-authentication-verification/td-p/498131

https://www.baeldung.com/java-hmac

耀駿施 71 Reputation points

2022-05-17T03:10:13.383+00:00

I have the similar problem with you. Did you resolve it ?
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Outgoing webhook with java

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