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claim_strings.go
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/
claim_strings.go
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package jwt
import (
"encoding/json"
"reflect"
)
// ClaimStrings is used for parsing claim properties that
// can be either a string or array of strings
type ClaimStrings []string
// ParseClaimStrings is used to produce a ClaimStrings value
// from the various forms it may present during encoding/decodeing
func ParseClaimStrings(value interface{}) (ClaimStrings, error) {
switch v := value.(type) {
case string:
return ClaimStrings{v}, nil
case []string:
return ClaimStrings(v), nil
case []interface{}:
result := make(ClaimStrings, 0, len(v))
for i, vv := range v {
if x, ok := vv.(string); ok {
result = append(result, x)
} else {
return nil, &json.UnsupportedTypeError{Type: reflect.TypeOf(v[i])}
}
}
return result, nil
case nil:
return nil, nil
default:
return nil, &json.UnsupportedTypeError{Type: reflect.TypeOf(v)}
}
}
// UnmarshalJSON implements the json package's Unmarshaler interface
func (c *ClaimStrings) UnmarshalJSON(data []byte) error {
var value interface{}
err := json.Unmarshal(data, &value)
if err != nil {
return err
}
*c, err = ParseClaimStrings(value)
return err
}