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package jwt
import (
"encoding/json"
"fmt"
)
// MapClaims is a claims type that uses the map[string]interface{} for JSON
// decoding. This is the default claims type if you don't supply one
type MapClaims map[string]interface{}
// GetExpirationTime implements the Claims interface.
func (m MapClaims) GetExpirationTime() (*NumericDate, error) {
return m.parseNumericDate("exp")
}
// GetNotBefore implements the Claims interface.
func (m MapClaims) GetNotBefore() (*NumericDate, error) {
return m.parseNumericDate("nbf")
}
// GetIssuedAt implements the Claims interface.
func (m MapClaims) GetIssuedAt() (*NumericDate, error) {
return m.parseNumericDate("iat")
}
// GetAudience implements the Claims interface.
func (m MapClaims) GetAudience() (ClaimStrings, error) {
return m.parseClaimsString("aud")
}
// GetIssuer implements the Claims interface.
func (m MapClaims) GetIssuer() (string, error) {
return m.parseString("iss")
}
// GetSubject implements the Claims interface.
func (m MapClaims) GetSubject() (string, error) {
return m.parseString("sub")
}
// parseNumericDate tries to parse a key in the map claims type as a number
// date. This will succeed, if the underlying type is either a [float64] or a
// [json.Number]. Otherwise, nil will be returned.
func (m MapClaims) parseNumericDate(key string) (*NumericDate, error) {
v, ok := m[key]
if !ok {
return nil, nil
}
switch exp := v.(type) {
case float64:
if exp == 0 {
return nil, nil
}
return newNumericDateFromSeconds(exp), nil
case json.Number:
v, _ := exp.Float64()
return newNumericDateFromSeconds(v), nil
}
return nil, newError(fmt.Sprintf("%s is invalid", key), ErrInvalidType)
}
// parseClaimsString tries to parse a key in the map claims type as a
// [ClaimsStrings] type, which can either be a string or an array of string.
func (m MapClaims) parseClaimsString(key string) (ClaimStrings, error) {
var cs []string
switch v := m[key].(type) {
case string:
cs = append(cs, v)
case []string:
cs = v
case []interface{}:
for _, a := range v {
vs, ok := a.(string)
if !ok {
return nil, newError(fmt.Sprintf("%s is invalid", key), ErrInvalidType)
}
cs = append(cs, vs)
}
}
return cs, nil
}
// parseString tries to parse a key in the map claims type as a [string] type.
// If the key does not exist, an empty string is returned. If the key has the
// wrong type, an error is returned.
func (m MapClaims) parseString(key string) (string, error) {
var (
ok bool
raw interface{}
iss string
)
raw, ok = m[key]
if !ok {
return "", nil
}
iss, ok = raw.(string)
if !ok {
return "", newError(fmt.Sprintf("%s is invalid", key), ErrInvalidType)
}
return iss, nil
}
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