I would like a github EE user to be able to create/update a specific type of issue in JIRA...

[Brian W. Bishop]

...from a commit message and via the creation of an 'issue' in git

Shall I write my own plugin? Only if it allows me to expose a custom Jira REST API endpoint that I can hit from a github webhook.

Is there some other Jira construct that allows me to create a custom REST API endpoint in Jira?

[Alexey Matveev · Accepted solution]

Hello,

REST API is available in Jira. 

You can find available Jira REST API here:

https://docs.atlassian.com/jira/REST/server/

If you want to create issue you should use POST /rest/api/2/issue. If you want to update issue you should use PUT /rest/api/2/issue/{issueIdOrKey}

You can install Atlassian REST API browser plugin for making your life easier while palying with Jira REST API.

https://marketplace.atlassian.com/plugins/com.atlassian.labs.rest-api-browser/server/overview

[Brian W. Bishop]

I know very well about the API thank you. But since I am not in control of the github webhook post, then I need to fabricate a REST API endpoint of my own design, that will consume the requests from the external system. And then yes, handle them by processing them into jira issue updates.

[Alexey Matveev]

You can use Adaptivist Scriptrunner to develop a custom REST Endpoint. It will be less time consuming then developing a plugin.

[Brian W. Bishop]

Thanks@Alexey Matveev