Context Aware Template

golang
Context Aware Template Function
package main

import (
	"html/template"
	"os"
)

const hometmpl = `
{{define "home"}}
<html>
<body>
	*Welcome*
	<a href="/flowers">Go to the Flowers gallery</a>
	<a href="/puppies">Go to the Puppies gallery</a>
	{{if isAdmin}}
		<a href="/admin/nuke">Go to the big red nuclear button</a>
	{{end}}
</body>
</html>
{{end}}
`

var t *template.Template

var defaultfuncs = map[string]interface{}{
	"isAdmin": func() bool { return false },
}

func init() {
	t = template.New("home").Funcs(defaultfuncs)
	t, _ = t.Parse(hometmpl)
}

func main() {
	token := "0xCAFEBABE" // Or extracted from the http.Request

	t.Funcs(template.FuncMap{"isAdmin": func() bool { return token == "0xCAFEBABE" }})

	t.ExecuteTemplate(os.Stdout, "home", nil)
}