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package jwt
import (
"errors"
"fmt"
"strings"
)
var (
ErrInvalidKey = errors.New("key is invalid")
ErrInvalidKeyType = errors.New("key is of invalid type")
ErrHashUnavailable = errors.New("the requested hash function is unavailable")
ErrTokenMalformed = errors.New("token is malformed")
ErrTokenUnverifiable = errors.New("token is unverifiable")
ErrTokenSignatureInvalid = errors.New("token signature is invalid")
ErrTokenRequiredClaimMissing = errors.New("token is missing required claim")
ErrTokenInvalidAudience = errors.New("token has invalid audience")
ErrTokenExpired = errors.New("token is expired")
ErrTokenUsedBeforeIssued = errors.New("token used before issued")
ErrTokenInvalidIssuer = errors.New("token has invalid issuer")
ErrTokenInvalidSubject = errors.New("token has invalid subject")
ErrTokenNotValidYet = errors.New("token is not valid yet")
ErrTokenInvalidId = errors.New("token has invalid id")
ErrTokenInvalidClaims = errors.New("token has invalid claims")
ErrInvalidType = errors.New("invalid type for claim")
)
// joinedError is an error type that works similar to what [errors.Join]
// produces, with the exception that it has a nice error string; mainly its
// error messages are concatenated using a comma, rather than a newline.
type joinedError struct {
errs []error
}
func (je joinedError) Error() string {
msg := []string{}
for _, err := range je.errs {
msg = append(msg, err.Error())
}
return strings.Join(msg, ", ")
}
// joinErrors joins together multiple errors. Useful for scenarios where
// multiple errors next to each other occur, e.g., in claims validation.
func joinErrors(errs ...error) error {
return &joinedError{
errs: errs,
}
}
// Unwrap implements the multiple error unwrapping for this error type, which is
// possible in Go 1.20.
func (je joinedError) Unwrap() []error {
return je.errs
}
// newError creates a new error message with a detailed error message. The
// message will be prefixed with the contents of the supplied error type.
// Additionally, more errors, that provide more context can be supplied which
// will be appended to the message. This makes use of Go 1.20's possibility to
// include more than one %w formatting directive in [fmt.Errorf].
//
// For example,
//
// newError("no keyfunc was provided", ErrTokenUnverifiable)
//
// will produce the error string
//
// "token is unverifiable: no keyfunc was provided"
func newError(message string, err error, more ...error) error {
var format string
var args []any
if message != "" {
format = "%w: %s"
args = []any{err, message}
} else {
format = "%w"
args = []any{err}
}
for _, e := range more {
format += ": %w"
args = append(args, e)
}
err = fmt.Errorf(format, args...)
return err
}
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