certificates/x509util/options.go

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package x509util
import (
"bytes"
"io/ioutil"
"text/template"
"github.com/Masterminds/sprig/v3"
"github.com/pkg/errors"
"github.com/smallstep/cli/config"
)
// Options are the options that can be passed to NewCertificate.
type Options struct {
CertBuffer *bytes.Buffer
}
func (o *Options) apply(opts []Option) (*Options, error) {
for _, fn := range opts {
if err := fn(o); err != nil {
return o, err
}
}
return o, nil
}
// TemplateData is an alias for map[string]interface{}. It represents the data
// passed to the templates.
type TemplateData map[string]interface{}
// Option is the type used as a variadic argument in NewCertificate.
type Option func(o *Options) error
// WithTemplate is an options that executes the given template text with the
// given data.
func WithTemplate(text string, data map[string]interface{}) Option {
return func(o *Options) error {
tmpl, err := template.New("template").Funcs(sprig.TxtFuncMap()).Parse(text)
if err != nil {
return errors.Wrapf(err, "error parsing template")
}
buf := new(bytes.Buffer)
if err := tmpl.Execute(buf, data); err != nil {
return errors.Wrapf(err, "error executing template")
}
o.CertBuffer = buf
return nil
}
}
// WithTemplateFile is an options that reads the template file and executes it
// with the given data.
func WithTemplateFile(path string, data map[string]interface{}) Option {
return func(o *Options) error {
filename := config.StepAbs(path)
b, err := ioutil.ReadFile(filename)
if err != nil {
return errors.Wrapf(err, "error reading %s", path)
}
tmpl, err := template.New(path).Funcs(sprig.TxtFuncMap()).Parse(string(b))
if err != nil {
return errors.Wrapf(err, "error parsing %s", path)
}
buf := new(bytes.Buffer)
if err := tmpl.Execute(buf, data); err != nil {
return errors.Wrapf(err, "error executing %s", path)
}
o.CertBuffer = buf
return nil
}
}