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# Templates in Webhook
[`webhook`][w] can parse a hooks configuration file as a Go template when given the `-template` [CLI parameter](Webhook-Parameters.md).
In additional to the [built-in Go template functions and features][tt], `webhook` provides a `getenv` template function for inserting environment variables into a templated configuration file.
## Example Usage
In the example JSON template file below (YAML is also supported), the `payload-hmac-sha1` matching rule looks up the HMAC secret from the environment using the `getenv` template function.
Additionally, the result is piped through the built-in Go template function `js` to ensure that the result is a well-formed Javascript/JSON string.
```
{
"id": "webhook",
"execute-command": "/home/adnan/redeploy-go-webhook.sh",
"command-working-directory": "/home/adnan/go",
"response-message": "I got the payload!",
"response-headers":
[
{
"name": "Access-Control-Allow-Origin",
"value": "*"
}
],
"pass-arguments-to-command":
[
{
"source": "payload",
"name": "head_commit.id"
},
{
"source": "payload",
"name": "pusher.name"
},
{
"source": "payload",
"name": "pusher.email"
}
],
"trigger-rule":
{
"and":
[
{
"match":
{
"type": "payload-hmac-sha1",
"secret": "{{ getenv "XXXTEST_SECRET" | js }}",
"parameter":
{
"source": "header",
"name": "X-Hub-Signature"
}
}
},
{
"match":
{
"type": "value",
"value": "refs/heads/master",
"parameter":
{
"source": "payload",
"name": "ref"
}
}
}
]
}
}
]
```
[w]: https://github.com/adnanh/webhook
[tt]: https://golang.org/pkg/text/template/
|
