straightdave / workflow-webhook

A Github workflow action to push to a webhook

Workflow Webhook Action

A Github workflow action to call (POST) a remote webhook endpoint with a json payload, and support for BASIC authentication. A hash signature is passed with each request, derived from the payload and a configurable secret token. The hash signature is identical to that which a regular Github webhook would generate, and sent in a header field named X-Hub-Signature. Therefore any existing Github webhook signature validation will continue to work. For more information on how to valiate the signature, see https://developer.github.com/webhooks/securing.

By default, the values of the following workflow environment variables are sent in the payload: GITHUB_REPOSITORY, GITHUB_REF, GITHUB_SHA, GITHUB_EVENT_NAME and GITHUB_WORKFLOW. For more information on what is contained in these variables, see https://help.github.com/en/actions/automating-your-workflow-with-github-actions/using-environment-variables.

Additional (custom) data can be added to the payload as well.

Usage

The following are example snippets for a Github yaml workflow configuration.

Send the default JSON payload to a webhook:

    - name: Invoke deployment hook
      uses: distributhor/workflow-webhook@v1
      env:
        webhook_url: ${{ secrets.WEBHOOK_URL }}
        webhook_secret: ${{ secrets.WEBHOOK_SECRET }}

Will deliver a payload with the following properties:

{
    "repository": "owner/project",
    "ref": "refs/heads/master",
    "commit": "a636b6f0861bbee98039bf3df66ee13d8fbc9c74",
    "event": "push",
    "workflow": "Build and deploy"
}

Add additional data to the payload:

    - name: Invoke deployment hook
      uses: distributhor/workflow-webhook@v1
      env:
        webhook_url: ${{ secrets.WEBHOOK_URL }}
        webhook_secret: ${{ secrets.WEBHOOK_SECRET }}
        data: '{ "weapon": "hammer", "drink" : "beer" }'

The additional information will become available on a 'data' property, and now look like:

{
    "repository": "owner/project",
    "ref": "refs/heads/master",
    "commit": "a636b6f0861bbee98039bf3df66ee13d8fbc9c74",
    "event": "push",
    "workflow": "Build and deploy",
    "data": {
        "weapon": "hammer",
        "drink": "beer"
    }
}

Arguments

  webhook_url: "https://your.webhook"

Required. The HTTP URI of the webhook endpoint to invoke. The endpoint must accept an HTTP POST request.

  webhook_secret: "Y0uR5ecr3t"

Required. The secret with which to generate the signature hash.

  webhook_auth: "username:password"

Credentials to be used for BASIC authentication against the endpoint. If not configured, authentication is assumed not to be required. If configured, it must follow the format username:password, which will be used as the BASIC auth credential.

  data: "Additional json"

Additional data to include in the payload. The argument is optional if the default fields are sufficient and you wish to provide no further information.

The custom data will be available on a property named data, and it will be run through a json validator. Invalid json will cause the action to break and exit. For example, using single quotes for json properties and values instead of double quotes, will show the following (somewhat confusing) message in your workflow output: Invalid numeric literal. Such messages are the direct output from the validation library https://stedolan.github.io/jq/. The supplied json must pass the validation run through jq.

License

The MIT License (MIT). Please see License File for more information.