forked from TrueCloudLab/certificates
76 lines
2 KiB
Go
76 lines
2 KiB
Go
package x509util
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import (
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"bytes"
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"crypto/x509"
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"encoding/base64"
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"io/ioutil"
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"text/template"
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"github.com/Masterminds/sprig/v3"
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"github.com/pkg/errors"
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"github.com/smallstep/cli/config"
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)
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// Options are the options that can be passed to NewCertificate.
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type Options struct {
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CertBuffer *bytes.Buffer
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}
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func (o *Options) apply(cr *x509.CertificateRequest, opts []Option) (*Options, error) {
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for _, fn := range opts {
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if err := fn(cr, o); err != nil {
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return o, err
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}
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}
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return o, nil
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}
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// Option is the type used as a variadic argument in NewCertificate.
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type Option func(cr *x509.CertificateRequest, o *Options) error
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// WithTemplate is an options that executes the given template text with the
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// given data.
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func WithTemplate(text string, data TemplateData) Option {
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return func(cr *x509.CertificateRequest, o *Options) error {
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tmpl, err := template.New("template").Funcs(sprig.TxtFuncMap()).Parse(text)
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if err != nil {
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return errors.Wrapf(err, "error parsing template")
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}
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buf := new(bytes.Buffer)
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data.SetCertificateRequest(cr)
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if err := tmpl.Execute(buf, data); err != nil {
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return errors.Wrapf(err, "error executing template")
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}
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o.CertBuffer = buf
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return nil
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}
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}
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// WithTemplateBase64 is an options that executes the given template base64
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// string with the given data.
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func WithTemplateBase64(s string, data TemplateData) Option {
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return func(cr *x509.CertificateRequest, o *Options) error {
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b, err := base64.StdEncoding.DecodeString(s)
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if err != nil {
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return errors.Wrap(err, "error decoding template")
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}
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fn := WithTemplate(string(b), data)
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return fn(cr, o)
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}
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}
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// WithTemplateFile is an options that reads the template file and executes it
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// with the given data.
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func WithTemplateFile(path string, data TemplateData) Option {
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return func(cr *x509.CertificateRequest, o *Options) error {
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filename := config.StepAbs(path)
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b, err := ioutil.ReadFile(filename)
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if err != nil {
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return errors.Wrapf(err, "error reading %s", path)
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}
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fn := WithTemplate(string(b), data)
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return fn(cr, o)
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}
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}
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