Merge pull request #299 from okisetiawan0101/new-string-length-tag

New string length validator

types.go

@@ -59,13 +59,15 @@ var InterfaceParamTagRegexMap = map[string]*regexp.Regexp{
 
 // ParamTagMap is a map of functions accept variants parameters
 var ParamTagMap = map[string]ParamValidator{
-	"length":       ByteLength,
-	"range":        Range,
-	"runelength":   RuneLength,
-	"stringlength": StringLength,
-	"matches":      StringMatches,
-	"in":           isInRaw,
-	"rsapub":       IsRsaPub,
+	"length":          ByteLength,
+	"range":           Range,
+	"runelength":      RuneLength,
+	"stringlength":    StringLength,
+	"matches":         StringMatches,
+	"in":              IsInRaw,
+	"rsapub":          IsRsaPub,
+	"minstringlength": MinStringLength,
+	"maxstringlength": MaxStringLength,
 }
 
 // ParamTagRegexMap maps param tags to their respective regexes.
@@ -77,6 +79,8 @@ var ParamTagRegexMap = map[string]*regexp.Regexp{
 	"in":           regexp.MustCompile(`^in\((.*)\)`),
 	"matches":      regexp.MustCompile(`^matches\((.+)\)$`),
 	"rsapub":       regexp.MustCompile("^rsapub\\((\\d+)\\)$"),
+	"minstringlength": regexp.MustCompile("^minstringlength\\((\\d+)\\)$"),
+	"maxstringlength": regexp.MustCompile("^maxstringlength\\((\\d+)\\)$"),
 }
 
 type customTypeTagMap struct {

validator.go

@@ -1127,6 +1127,30 @@ func StringLength(str string, params ...string) bool {
 	return false
 }
 
+// MinStringLength check string's minimum length (including multi byte strings)
+func MinStringLength(str string, params ...string) bool {
+
+	if len(params) == 1 {
+		strLength := utf8.RuneCountInString(str)
+		min, _ := ToInt(params[0])
+		return strLength >= int(min)
+	}
+
+	return false
+}
+
+// MaxStringLength check string's maximum length (including multi byte strings)
+func MaxStringLength(str string, params ...string) bool {
+
+	if len(params) == 1 {
+		strLength := utf8.RuneCountInString(str)
+		max, _ := ToInt(params[0])
+		return strLength <= int(max)
+	}
+
+	return false
+}
+
 // Range check string's length
 func Range(str string, params ...string) bool {
 	if len(params) == 2 {
@@ -1139,7 +1163,7 @@ func Range(str string, params ...string) bool {
 	return false
 }
 
-func isInRaw(str string, params ...string) bool {
+func IsInRaw(str string, params ...string) bool {
 	if len(params) == 1 {
 		rawParams := params[0]