add validation for base64 url without = padding (#1024)

Co-authored-by: Yasoob Haider <[email protected]>
Co-authored-by: Dean Karn <[email protected]>

Author: 3 people

README.md

@@ -150,6 +150,7 @@ Baked-in Validations
 | - | - |
 | base64 | Base64 String |
 | base64url | Base64URL String |
+| base64rawurl | Base64RawURL String |
 | bic | Business Identifier Code (ISO 9362) |
 | bcp47_language_tag | Language tag (BCP 47) |
 | btc_addr | Bitcoin Address |

baked_in.go

@@ -129,6 +129,7 @@ var (
 		"file":                          isFile,
 		"base64":                        isBase64,
 		"base64url":                     isBase64URL,
+		"base64rawurl":                  isBase64RawURL,
 		"contains":                      contains,
 		"containsany":                   containsAny,
 		"containsrune":                  containsRune,
@@ -1364,6 +1365,11 @@ func isBase64URL(fl FieldLevel) bool {
 	return base64URLRegex.MatchString(fl.Field().String())
 }
 
+// isBase64RawURL is the validation function for validating if the current field's value is a valid base64 URL safe string without '=' padding.
+func isBase64RawURL(fl FieldLevel) bool {
+	return base64RawURLRegex.MatchString(fl.Field().String())
+}
+
 // isURI is the validation function for validating if the current field's value is a valid URI.
 func isURI(fl FieldLevel) bool {
 	field := fl.Field()

cache.go

@@ -120,7 +120,7 @@ func (v *Validate) extractStructCache(current reflect.Value, sName string) *cStr
 	var fld reflect.StructField
 	var tag string
 	var customName string
-	
+
 	for i := 0; i < numFields; i++ {
 
 		fld = typ.Field(i)