Add example usage of outgoing webhooks

[hanzei]

Summary

Ticket Link

For mattermost/mattermost#23805

[codecov-commenter]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (308bdd6) 2.93% compared to head (3ce8588) 3.10%.

Files	Patch %	Lines
server/http_hooks.go	16.00%	21 Missing ⚠️
server/utils.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #171      +/-   ##
=========================================
+ Coverage    2.93%   3.10%   +0.16%     
=========================================
  Files          14      15       +1     
  Lines        1838    1869      +31     
=========================================
+ Hits           54      58       +4     
- Misses       1782    1809      +27     
  Partials        2       2              

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[DHaussermann]

/update-branch

[DHaussermann]

@hanzei I have a bit of a silly problem. I can't get the build for this.
Locally when I build I get these errors. I have tried using various versions of node and it did not solve it.

Perhaps more important than whatever is happening on my local... I see the pipeline can build it just fine but I don't know how to go get the artifact. Has this UI changed?

Where do I go get this? I think there use to be a grren button in the UI that I no longer see. But that may have never been the case for this repo.

Please let me know if you can provide some guidance.

[hanzei]

Can you please run nvm use to select the right version?

[DHaussermann]

@hanzei I may ned help on this again.
I'm afraid this isn't related to your PR but I can't make a working outgoing webhook to test with. I set the callback to some URL where the is no app waiting for the request but that should not matter for what I'm doing.

I see an error when it tries to fire the hook.

{
  "caller": "app/webhook.go:120",
  "error": "doOutgoingWebhookRequest: Failed to unmarshal., invalid character 'T' looking for beginning of value",
  "ip_addr": "74.15.38.100",
  "level": "error",
  "method": "POST",
  "msg": "Event POST failed.",
  "path": "/api/v4/posts",
  "request_id": "kneiybqcet868b34tircbf7tsr",
  "timestamp": "2023-12-07 22:19:10.556 Z",
  "user_id": "sn41xt7ktjyapy36xn454f144c"
}

Please advise what I may be missing here. It's not clear to me what value stats with T that I need to adjust.

[DHaussermann]

@hanzei I tried this again but still no luck.

I made a valid outgoing webhook to a server running locally and the demo plugin did not do anything. Which is probably expected.

I also read the documentation updates and you provided and pointed the hook to http://localhost:8065/plugins/com.mattermost.demo-plugin/webhook/outgoing but also saw no reposnse.

Let me know if you have any suggestions.

[hanzei]

@DHaussermann Can you please share a screenshot of settings that your Outgoing Webhook uses?

[DHaussermann]

@hanzei When I set this up again on a new /cloud server it was working. Possibly there was a typo or some other config error. It's just strange because I also tried locally with a localhost:8065 calback URL
Probably of little interest to you know but here is the config...

[DHaussermann]

Tested and passed

• Demo plugin now provided a mechanism for testing outgoing webhook that posts a response as expected
• Setup is documented.
• Delay setting in plugin config is respected.
• I ended up not needing the logging but I did try with an incorrect callback URL and confirmed and error clearly shows a failure for an outgoing webhook and provides details.

LGTM!

Huge thanks @hanzei this is a great enhancement that will help facilitate future testing! 🎉