Add TokenExtractionError and TokenParsingError types to help distinguishing error source in ErrorHandler

Author: aldas

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## v4.1.0 - 2023-01-26
+
+**Enhancements**
+
+* Add TokenExtractionError and TokenParsingError types to help distinguishing error source in ErrorHandler [#6](https://github.com/labstack/echo-jwt/pull/6)
+
+
 ## v4.0.1 - 2023-01-24
 
 **Fixes**

extrators.go renamed to extractors.go

@@ -18,6 +18,19 @@ const (
 	extractorLimit = 20
 )
 
+// TokenExtractionError is catch all type for all errors that occur when the token is extracted from the request. This
+// helps to distinguish extractor errors from token parsing errors even if custom extractors or token parsing functions
+// are being used that have their own custom errors.
+type TokenExtractionError struct {
+	Err error
+}
+
+// Is checks if target error is same as TokenExtractionError
+func (e TokenExtractionError) Is(target error) bool { return target == ErrJWTMissing } // to provide some compatibility with older error handling logic
+
+func (e *TokenExtractionError) Error() string { return e.Err.Error() }
+func (e *TokenExtractionError) Unwrap() error { return e.Err }
+
 var errHeaderExtractorValueMissing = errors.New("missing value in request header")
 var errHeaderExtractorValueInvalid = errors.New("invalid value in request header")
 var errQueryExtractorValueMissing = errors.New("missing value in the query string")