1 files changed, 78 insertions, 0 deletions
diff --git a/vendor/github.com/golang-jwt/jwt/v5/errors_go_other.go b/vendor/github.com/golang-jwt/jwt/v5/errors_go_other.go
new file mode 100644
index 000000000..2ad542f00
--- /dev/null
+++ b/vendor/github.com/golang-jwt/jwt/v5/errors_go_other.go
@@ -0,0 +1,78 @@
+//go:build !go1.20
+// +build !go1.20
+
+package jwt
+
+import (
+	"errors"
+	"fmt"
+)
+
+// Is implements checking for multiple errors using [errors.Is], since multiple
+// error unwrapping is not possible in versions less than Go 1.20.
+func (je joinedError) Is(err error) bool {
+	for _, e := range je.errs {
+		if errors.Is(e, err) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// wrappedErrors is a workaround for wrapping multiple errors in environments
+// where Go 1.20 is not available. It basically uses the already implemented
+// functionality of joinedError to handle multiple errors with supplies a
+// custom error message that is identical to the one we produce in Go 1.20 using
+// multiple %w directives.
+type wrappedErrors struct {
+	msg string
+	joinedError
+}
+
+// Error returns the stored error string
+func (we wrappedErrors) Error() string {
+	return we.msg
+}
+
+// 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. Since we cannot use of Go 1.20's possibility
+// to include more than one %w formatting directive in [fmt.Errorf], we have to
+// emulate that.
+//
+// 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 {
+	// We cannot wrap multiple errors here with %w, so we have to be a little
+	// bit creative. Basically, we are using %s instead of %w to produce the
+	// same error message and then throw the result into a custom error struct.
+	var format string
+	var args []any
+	if message != "" {
+		format = "%s: %s"
+		args = []any{err, message}
+	} else {
+		format = "%s"
+		args = []any{err}
+	}
+	errs := []error{err}
+
+	for _, e := range more {
+		format += ": %s"
+		args = append(args, e)
+		errs = append(errs, e)
+	}
+
+	err = &wrappedErrors{
+		msg:         fmt.Sprintf(format, args...),
+		joinedError: joinedError{errs: errs},
+	}
+	return err
+}