Outgoing webhook with java

Question

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 41,451 Reputation points Moderator

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.

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Yuki Sun-MSFT 41,451 Reputation points Moderator

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.

Answer 1

Nivedipa-MSFT 3,946 Microsoft External Staff Moderator

@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

If the response is helpful, please click "Accept Answer" and upvote it. You can share your feedback via Microsoft Teams Developer Feedback link.

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 3,946 Reputation points Microsoft External Staff Moderator

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 3,946 Reputation points Microsoft External Staff Moderator

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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