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when.go
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when.go
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package cmdutil
import (
"fmt"
"os"
"strings"
"github.com/antonmedv/expr"
"github.com/pkg/errors"
)
func IsAllowedToExecute(when string) (bool, error) {
if when == "" {
return true, nil
}
ropts := []string{}
em := envMap()
for k := range em {
ropts = append(ropts, fmt.Sprintf("$%s", k), fmt.Sprintf("Env.%s", k))
}
r := strings.NewReplacer(ropts...)
when = r.Replace(when)
got, err := expr.Eval(fmt.Sprintf("(%s) == true", when), struct {
Env map[string]string
}{
Env: em,
})
if err != nil {
return false, errors.WithStack(err)
}
return got.(bool), nil
}
func envMap() map[string]string {
m := map[string]string{}
for _, kv := range os.Environ() {
if !strings.Contains(kv, "=") {
continue
}
parts := strings.SplitN(kv, "=", 2)
k := parts[0]
if len(parts) < 2 {
m[k] = ""
continue
}
m[k] = parts[1]
}
return m
}