forked from ipfs/go-ipfs-config
/
types.go
41 lines (36 loc) · 908 Bytes
/
types.go
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package config
import (
"encoding/json"
)
// Strings is a helper type that (un)marshals a single string to/from a single
// JSON string and a slice of strings to/from a JSON array of strings.
type Strings []string
// UnmarshalJSON conforms to the json.Unmarshaler interface.
func (o *Strings) UnmarshalJSON(data []byte) error {
if data[0] == '[' {
return json.Unmarshal(data, (*[]string)(o))
}
var value string
if err := json.Unmarshal(data, &value); err != nil {
return err
}
if len(value) == 0 {
*o = []string{}
} else {
*o = []string{value}
}
return nil
}
// MarshalJSON conforms to the json.Marshaler interface.
func (o Strings) MarshalJSON() ([]byte, error) {
switch len(o) {
case 0:
return json.Marshal(nil)
case 1:
return json.Marshal(o[0])
default:
return json.Marshal([]string(o))
}
}
var _ json.Unmarshaler = (*Strings)(nil)
var _ json.Marshaler = (*Strings)(nil)