Unable to enable Slack's "Enable Events" through Google Scripts

Question

So I'm attempting to create a SlackBot which can track reacts to a message it posted. However, I'm also trying to read from a Google Sheet, so the code for the bot will be in a Google Script connecting to the form.

I clearly need to enable events in order to see reacts, and the first step is to receive and respond to a POST request Slack sends:

Our Request:
POST
"body": { 
     "type": "url_verification",
     "token": "---",
     "challenge": "---"
}

I have to respond with something along the lines of:

HTTP 200 OK, 
Content-type: text/plain, 
"the challenge code"

When I recieve the POST request, it overwrites square 1,1 of the Google Sheet, which is not great, but more concerningly, my doPost function doesn't run.

Here's what I get back from Slack:

Your Response:
"code": 200
"error": "challenge_failed"
"body": {
 <!DOCTYPE html><html><head><link rel="shortcut icon" href="//ssl.gstatic.com/docs/script/images/favicon.ico"><title>Error</title><style type="text/css">body {background-color: #fff; margin: 0; padding: 0;}.errorMessage {font-family: Arial,sans-serif; font-size: 12pt; font-weight: bold; line-height: 150%; padding-top: 25px;}</style></head><body style="margin:20px"><div><img alt="Google Apps Script" src="//ssl.gstatic.com/docs/script/images/logo.png"></div><div style="text-align:center;font-family:monospace;margin:50px auto 0;max-width:600px">The script completed but did not return anything.</div></body></html> 
}

Now, here's all the code I have in my Google Script.

 function doPost(request){ var postJSON = request.postData.getDataAsString(); var sheet = SpreadsheetApp.getActiveSheet(); // doesn't happen sheet.getRange(5, 3).setValue("YEAH"); // when I send a req using CURL, I get the message // "The script completed but did not return anything" return postJSON; }

It's already deployed as a web app, and I've been updating it every time I make a change to the code, so that isn't the issue.

Any advice would be appreciated, thank you!

Answer 1

I think that in this case, it is required to return the value of challenge . So how about the following modification?

From:

var postJSON = request.postData.getDataAsString();

To:

var postJSON = JSON.parse(request.postData.getDataAsString());

And also, please modify as follows.

From:

return postJSON;

To:

return ContentService.createTextOutput(postJSON.challenge);

Note:

In this modification, it supposes that postJSON in your current script is {"type": "url_verification", "token": "---", "challenge": "---"} . Please be careful this.
Also, it supposes that the Web Apps is deployed as Execute the app as: Me and Who has access to the app: Anyone, even anonymous .
When the script of Web Apps is modified, please redeploy it as new version. By this, the latest script is reflected to the Web Apps. Please be careful this.

Unable to enable Slack's "Enable Events" through Google Scripts

Question

1 answers

solution1
1 2020-09-19 08:42:28

From:

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From:

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Note:

References:

Unable to enable Slack's "Enable Events" through Google Scripts

Question

1 answers

solution1 1 2020-09-19 08:42:28

From:

To:

From:

To:

Note:

References:

solution1
1 2020-09-19 08:42:28