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options.go
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options.go
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package crypto
import (
"errors"
wrapping "github.com/hxfs/go-kms-wrapping/v2"
)
// getOpts iterates the inbound Options and returns a struct
func getOpts(opt ...wrapping.Option) (*options, error) {
// First, separate out options into local and global
opts := getDefaultOptions()
for _, o := range opt {
if o == nil {
continue
}
iface := o()
switch to := iface.(type) {
case OptionFunc:
if err := to(&opts); err != nil {
return nil, err
}
default:
return nil, errors.New("option passed into util wrapping options handler" +
" that is not from this package; this is likely due to the wrapper being" +
" invoked as a plugin but options being sent from a specific wrapper package;" +
" use WithConfigMap to send options via the plugin interface")
}
}
return &opts, nil
}
// OptionFunc holds a function with local options
type OptionFunc func(*options) error
// options = how options are represented
type options struct {
withPrefix string
withPrk []byte
withEd25519 bool
withBase64Encoding bool
withBase58Encoding bool
withSalt []byte
withInfo []byte
}
func getDefaultOptions() options {
return options{}
}
// WithPrefix allows an optional prefix to be specified for the data returned
func WithPrefix(prefix string) wrapping.Option {
return func() interface{} {
return OptionFunc(func(o *options) error {
o.withPrefix = prefix
return nil
})
}
}
// WithPrk allows an optional PRK (pseudorandom key) to be specified for an
// operation. If you're using this option with HmacSha256, you might consider
// using HmacSha256WithPrk instead.
func WithPrk(prk []byte) wrapping.Option {
return func() interface{} {
return OptionFunc(func(o *options) error {
o.withPrk = prk
return nil
})
}
}
// WithEd25519 allows an optional request to use ed25519 during the operation
func WithEd25519() wrapping.Option {
return func() interface{} {
return OptionFunc(func(o *options) error {
o.withEd25519 = true
return nil
})
}
}
// WithBase64Encoding allows an optional request to base64 encode the data returned
func WithBase64Encoding() wrapping.Option {
return func() interface{} {
return OptionFunc(func(o *options) error {
o.withBase64Encoding = true
return nil
})
}
}
// WithBase58Encoding allows an optional request to base58 encode the data returned
func WithBase58Encoding() wrapping.Option {
return func() interface{} {
return OptionFunc(func(o *options) error {
o.withBase58Encoding = true
return nil
})
}
}
// WithSalt allows optional salt to be specified for an operation.
func WithSalt(salt []byte) wrapping.Option {
return func() interface{} {
return OptionFunc(func(o *options) error {
o.withSalt = salt
return nil
})
}
}
// WithInfo allows optional info to be specified for an operation.
func WithInfo(info []byte) wrapping.Option {
return func() interface{} {
return OptionFunc(func(o *options) error {
o.withInfo = info
return nil
})
}
}