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31 lines
772 B
Go
31 lines
772 B
Go
package strslice
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import "encoding/json"
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// StrSlice represents a string or an array of strings.
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// We need to override the json decoder to accept both options.
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type StrSlice []string
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// UnmarshalJSON decodes the byte slice whether it's a string or an array of
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// strings. This method is needed to implement json.Unmarshaler.
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func (e *StrSlice) UnmarshalJSON(b []byte) error {
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if len(b) == 0 {
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// With no input, we preserve the existing value by returning nil and
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// leaving the target alone. This allows defining default values for
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// the type.
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return nil
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}
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p := make([]string, 0, 1)
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if err := json.Unmarshal(b, &p); err != nil {
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var s string
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if err := json.Unmarshal(b, &s); err != nil {
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return err
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}
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p = append(p, s)
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}
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*e = p
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return nil
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}
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