mirror of
https://github.com/gravitational/teleport.git
synced 2026-09-21 14:35:22 +08:00
97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
/*
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Copyright 2021 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"encoding/json"
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"github.com/gravitational/trace"
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)
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// Strings is a list of string that can unmarshal from list of strings
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// or a scalar string from scalar yaml or json property
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type Strings []string
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// UnmarshalJSON unmarshals scalar string or strings slice to Strings
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func (s *Strings) UnmarshalJSON(data []byte) error {
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if len(data) == 0 {
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return nil
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}
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var stringVar string
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if err := json.Unmarshal(data, &stringVar); err == nil {
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*s = []string{stringVar}
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return nil
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}
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var stringsVar []string
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if err := json.Unmarshal(data, &stringsVar); err != nil {
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return trace.Wrap(err)
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}
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*s = stringsVar
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return nil
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}
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// UnmarshalYAML is used to allow Strings to unmarshal from
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// scalar string value or from the list
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func (s *Strings) UnmarshalYAML(unmarshal func(interface{}) error) error {
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// try unmarshal as string
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var val string
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err := unmarshal(&val)
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if err == nil {
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*s = []string{val}
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return nil
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}
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// try unmarshal as slice
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var slice []string
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err = unmarshal(&slice)
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if err == nil {
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*s = slice
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return nil
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}
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return err
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}
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// MarshalJSON marshals to scalar value
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// if there is only one value in the list
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// to list otherwise
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func (s Strings) MarshalJSON() ([]byte, error) {
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if len(s) == 1 {
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return json.Marshal(s[0])
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}
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return json.Marshal([]string(s))
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}
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// MarshalYAML marshals to scalar value
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// if there is only one value in the list,
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// marshals to list otherwise
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func (s Strings) MarshalYAML() (interface{}, error) {
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if len(s) == 1 {
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return s[0], nil
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}
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return []string(s), nil
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}
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// MapToStrings collects keys and values of a map into a slice of strings.
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func MapToStrings(m map[string]string) []string {
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s := make([]string, 0, len(m)*2)
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for key, value := range m {
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s = append(s, key, value)
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}
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return s
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}
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