feat: add image validation

.gitignore

@@ -26,5 +26,6 @@ _testmain.go
 *.test
 *.out
 *.txt
+/**/*.DS_Store
 cover.html
 README.html

README.md

@@ -218,6 +218,7 @@ Baked-in Validations
 | - | - |
 | dir | Directory |
 | file | File path |
+| image | Image |
 | isdefault | Is Default |
 | len | Length |
 | max | Maximum |

baked_in.go

@@ -7,6 +7,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net"
 	"net/url"
 	"os"
@@ -20,6 +21,7 @@ import (
 	"golang.org/x/crypto/sha3"
 	"golang.org/x/text/language"
 
+	"github.com/gabriel-vasile/mimetype"
 	urn "github.com/leodido/go-urn"
 )
 
@@ -136,6 +138,7 @@ var (
 		"endswith":                      endsWith,
 		"startsnotwith":                 startsNotWith,
 		"endsnotwith":                   endsNotWith,
+		"image":                          isImage,
 		"isbn":                          isISBN,
 		"isbn10":                        isISBN10,
 		"isbn13":                        isISBN13,
@@ -1404,6 +1407,74 @@ func isFile(fl FieldLevel) bool {
 	panic(fmt.Sprintf("Bad field type %T", field.Interface()))
 }
 
+func isImage(fl FieldLevel) bool {
+	mimetypes := map[string]bool{
+		"image/bmp": true,
+		"image/cis-cod": true,
+		"image/gif": true,
+		"image/ief": true,
+		"image/jpeg": true, 
+		"image/jp2": true, 
+		"image/jpx": true, 
+		"image/jpm": true, 
+		"image/pipeg": true,
+		"image/png": true, 
+		"image/svg+xml": true,
+		"image/tiff": true,
+		"image/webp": true,
+		"image/x-cmu-raster": true,
+		"image/x-cmx": true,
+		"image/x-icon": true,
+		"image/x-portable-anymap": true,
+		"image/x-portable-bitmap": true,
+		"image/x-portable-graymap": true,
+		"image/x-portable-pixmap": true,
+		"image/x-rgb": true,
+		"image/x-xbitmap": true,
+		"image/x-xpixmap": true,
+		"image/x-xwindowdump": true,
+	}
+	field := fl.Field()
+
+	switch field.Kind() {
+	case reflect.String:
+		filePath := field.String()
+		fileInfo, err := os.Stat(filePath)
+
+		if err != nil {
+			return false
+		}
+
+		if fileInfo.IsDir() {
+			return false
+		}
+
+		file, err := os.OpenFile(filePath, os.O_RDWR, 0644)
+		if err != nil {
+			return false
+		}
+		defer file.Close()
+
+		mime, err := mimetype.DetectReader(file)
+		if err != nil {
+			return false
+		}
+
+		_, err = file.Seek(0, io.SeekStart)
+		if err != nil {
+			panic(fmt.Sprintf("Could not reset seek start for file. Error: %s", err))
+		}
+
+		if _, ok := mimetypes[mime.String()]; ok {
+			return true
+		}
+
+		return false
+	}
+
+	panic(fmt.Sprintf("Bad field type %T", field.Interface()))
+}
+
 // isE164 is the validation function for validating if the current field's value is a valid e.164 formatted phone number.
 func isE164(fl FieldLevel) bool {
 	return e164Regex.MatchString(fl.Field().String())

doc.go

@@ -873,6 +873,14 @@ This is done using os.Stat, which is a platform independent function.
 
 	Usage: file
 
+Image path
+
+This validates that a string value contains a valid file path and that
+the file exists on the machine and is an image.
+This is done using os.Stat and github.com/gabriel-vasile/mimetype
+
+	Usage: image
+
 URL String
 
 This validates that a string value contains a valid url

go.mod

@@ -4,6 +4,7 @@ go 1.13
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.1
 	github.com/go-playground/assert/v2 v2.0.1
 	github.com/go-playground/locales v0.14.0
 	github.com/go-playground/universal-translator v0.18.0
@@ -12,7 +13,6 @@ require (
 	github.com/rogpeppe/go-internal v1.8.0 // indirect
 	github.com/stretchr/testify v1.7.0 // indirect
 	golang.org/x/crypto v0.0.0-20211215153901-e495a2d5b3d3
-	golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069 // indirect
 	golang.org/x/text v0.3.7
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect

go.sum

@@ -2,6 +2,8 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gabriel-vasile/mimetype v1.4.1 h1:TRWk7se+TOjCYgRth7+1/OYLNiRNIotknkFtf/dnN7Q=
+github.com/gabriel-vasile/mimetype v1.4.1/go.mod h1:05Vi0w3Y9c/lNvJOdmIwvrrAhX3rYhfQQCaf9VJcv7M=
 github.com/go-playground/assert/v2 v2.0.1 h1:MsBgLAaY856+nPRTKrp3/OZK38U/wa0CcBYNjji3q3A=
 github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.14.0 h1:u50s323jtVGugKlcYeyzC0etD1HifMjqmJqb8WugfUU=
@@ -31,13 +33,15 @@ github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 golang.org/x/crypto v0.0.0-20211215153901-e495a2d5b3d3 h1:0es+/5331RGQPcXlMfP+WrnIIS6dNnNRe0WB02W0F4M=
 golang.org/x/crypto v0.0.0-20211215153901-e495a2d5b3d3/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e h1:TsQ7F31D3bUCLeqPT0u+yjp1guoArKaNKmCr22PYgTQ=
+golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069 h1:siQdpVirKtzPhKl3lZWozZraCFObP8S1v6PRp0bLrtU=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a h1:dGzPydgVsqGcTRVwiLJ1jVbufYwmzD3LfVPLKsKg+0k=
-golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=

translations/ar/ar.go

@@ -1346,6 +1346,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return t
 			},
 		},
+		{
+			tag:         "image",
+			translation: "يجب أن تكون {0} صورة صالحة",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/ar/ar_test.go

@@ -149,6 +149,7 @@ func TestTranslations(t *testing.T) {
 		PostCode          string            `validate:"postcode_iso3166_alpha2=SG"`
 		PostCodeCountry   string
 		PostCodeByField   string `validate:"postcode_iso3166_alpha2_field=PostCodeCountry"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -676,6 +677,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.PostCodeByField",
 			expected: "لا يتطابق PostCodeByField مع تنسيق الرمز البريدي للبلد في حقل PostCodeCountry",
 		},
+		{
+			ns: "Test.Image",
+			expected: "يجب أن تكون Image صورة صالحة",
+		},
 	}
 
 	for _, tt := range tests {

translations/en/en.go

@@ -1356,6 +1356,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 			translation: "{0} must be a valid boolean value",
 			override:    false,
 		},
+		{
+			tag:         "image",
+			translation: "{0} must be a valid image",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/en/en_test.go

@@ -152,6 +152,7 @@ func TestTranslations(t *testing.T) {
 		PostCodeCountry   string
 		PostCodeByField   string `validate:"postcode_iso3166_alpha2_field=PostCodeCountry"`
 		BooleanString     string `validate:"boolean"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -690,6 +691,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.BooleanString",
 			expected: "BooleanString must be a valid boolean value",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image must be a valid image",
+		},
 	}
 
 	for _, tt := range tests {

translations/es/es.go

@@ -1326,6 +1326,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return s
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} debe ser una imagen válida",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/es/es_test.go

@@ -142,6 +142,7 @@ func TestTranslations(t *testing.T) {
 		UniqueSlice       []string          `validate:"unique"`
 		UniqueArray       [3]string         `validate:"unique"`
 		UniqueMap         map[string]string `validate:"unique"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -637,6 +638,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.UniqueMap",
 			expected: "UniqueMap debe contener valores únicos",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image debe ser una imagen válida",
+		},
 	}
 
 	for _, tt := range tests {

translations/fa/fa.go

@@ -1341,6 +1341,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return t
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} باید یک تصویر معتبر باشد",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/fa/fa_test.go

@@ -148,6 +148,7 @@ func TestTranslations(t *testing.T) {
 		PostCode          string            `validate:"postcode_iso3166_alpha2=SG"`
 		PostCodeCountry   string
 		PostCodeByField   string `validate:"postcode_iso3166_alpha2_field=PostCodeCountry"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -671,8 +672,12 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.PostCodeByField",
 			expected: "PostCodeByField یک کدپستی معتبر کشور فیلد PostCodeCountry نیست",
 		},
+		{
+			ns:         "Test.Image",
+			expected: "Image باید یک تصویر معتبر باشد",
+		},
 	}
-
+	
 	for _, tt := range tests {
 
 		var fe validator.FieldError

translations/fr/fr.go

@@ -1316,6 +1316,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return s
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} doit être une image valide",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/fr/fr_test.go

@@ -139,6 +139,7 @@ func TestTranslations(t *testing.T) {
 		StrPtrGte         *string   `validate:"gte=10"`
 		OneOfString       string    `validate:"oneof=red green"`
 		OneOfInt          int       `validate:"oneof=5 63"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -619,6 +620,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.OneOfInt",
 			expected: "OneOfInt doit être l'un des choix suivants [5 63]",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image doit être une image valide",
+		},
 	}
 
 	for _, tt := range tests {

translations/id/id.go

@@ -1316,6 +1316,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return s
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} harus berupa gambar yang valid",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/id/id_test.go

@@ -139,6 +139,7 @@ func TestTranslations(t *testing.T) {
 		StrPtrGte         *string   `validate:"gte=10"`
 		OneOfString       string    `validate:"oneof=merah hijau"`
 		OneOfInt          int       `validate:"oneof=5 63"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -619,6 +620,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.OneOfInt",
 			expected: "OneOfInt harus berupa salah satu dari [5 63]",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image harus berupa gambar yang valid",
+		},
 	}
 
 	for _, tt := range tests {

translations/it/it.go

@@ -1205,6 +1205,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 			override:        false,
 			customTransFunc: customTransFuncV1,
 		},
+		{
+			tag:         "image",
+			translation: "{0} deve essere un'immagine valida",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/it/it_test.go

@@ -154,6 +154,7 @@ func TestTranslations(t *testing.T) {
 		PostCode            string            `validate:"postcode_iso3166_alpha2=SG"`
 		PostCodeCountry     string
 		PostCodeByField     string `validate:"postcode_iso3166_alpha2_field=PostCodeCountry"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -706,6 +707,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.PostCodeByField",
 			expected: "PostCodeByField non corrisponde al formato del codice postale dello stato nel campo PostCodeCountry",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image deve essere un'immagine valida",
+		},
 	}
 
 	for _, tt := range tests {

translations/ja/ja.go

@@ -1372,6 +1372,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return s
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} は有効な画像でなければなりません",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/ja/ja_test.go

@@ -139,6 +139,7 @@ func TestTranslations(t *testing.T) {
 		StrPtrGte         *string   `validate:"gte=10"`
 		OneOfString       string    `validate:"oneof=red green"`
 		OneOfInt          int       `validate:"oneof=5 63"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -619,6 +620,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.OneOfInt",
 			expected: "OneOfIntは[5 63]のうちのいずれかでなければなりません",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image は有効な画像でなければなりません",
+		},
 	}
 
 	for _, tt := range tests {

translations/nl/nl.go

@@ -1316,6 +1316,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return s
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} moet een geldige afbeelding zijn",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/nl/nl_test.go

@@ -139,6 +139,7 @@ func TestTranslations(t *testing.T) {
 		StrPtrGte         *string   `validate:"gte=10"`
 		OneOfString       string    `validate:"oneof=red green"`
 		OneOfInt          int       `validate:"oneof=5 63"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -619,6 +620,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.OneOfInt",
 			expected: "OneOfInt moet een van de volgende zijn [5 63]",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image moet een geldige afbeelding zijn",
+		},
 	}
 
 	for _, tt := range tests {

translations/pt/pt.go

@@ -1356,6 +1356,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return t
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} deve ser uma imagem válida",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/pt/pt_test.go

@@ -147,6 +147,7 @@ func TestTranslations(t *testing.T) {
 		LowercaseString   string            `validate:"lowercase"`
 		UppercaseString   string            `validate:"uppercase"`
 		Datetime          string            `validate:"datetime=2006-01-02"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -662,6 +663,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.Datetime",
 			expected: "Datetime não está no formato 2006-01-02",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image deve ser uma imagem válida",
+		},
 	}
 
 	for _, tt := range tests {

translations/pt_BR/pt_BR.go

@@ -1321,6 +1321,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 			translation: "{0} deve ser um valor booleano válido",
 			override:    false,
 		},
+		{
+			tag:         "image",
+			translation: "{0} deve ser uma imagen válido",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/pt_BR/pt_BR_test.go

@@ -140,6 +140,7 @@ func TestTranslations(t *testing.T) {
 		OneOfString       string    `validate:"oneof=red green"`
 		OneOfInt          int       `validate:"oneof=5 63"`
 		BooleanString     string    `validate:"boolean"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -625,6 +626,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.BooleanString",
 			expected: "BooleanString deve ser um valor booleano válido",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image deve ser uma imagen válido",
+		},
 	}
 
 	for _, tt := range tests {

translations/ru/ru.go

@@ -1439,6 +1439,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return s
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} должно быть допустимым изображением",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/ru/ru_test.go

@@ -164,6 +164,7 @@ func TestTranslations(t *testing.T) {
 		UniqueSlice             []string          `validate:"unique"`
 		UniqueArray             [3]string         `validate:"unique"`
 		UniqueMap               map[string]string `validate:"unique"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -745,6 +746,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.UniqueMap",
 			expected: "UniqueMap должен содержать уникальные значения",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image должно быть допустимым изображением",
+		},
 	}
 
 	for _, tt := range tests {

translations/tr/tr.go

@@ -1321,6 +1321,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return s
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} geçerli bir resim olmalıdır",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/tr/tr_test.go

@@ -142,6 +142,7 @@ func TestTranslations(t *testing.T) {
 		UniqueSlice       []string          `validate:"unique"`
 		UniqueArray       [3]string         `validate:"unique"`
 		UniqueMap         map[string]string `validate:"unique"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -637,6 +638,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.UniqueMap",
 			expected: "UniqueMap benzersiz değerler içermelidir",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image geçerli bir resim olmalıdır",
+		},
 	}
 
 	for _, tt := range tests {

translations/vi/vi.go

@@ -1341,6 +1341,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return t
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} phải là một hình ảnh hợp lệ",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/vi/vi_test.go

@@ -148,6 +148,7 @@ func TestTranslations(t *testing.T) {
 		PostCode          string            `validate:"postcode_iso3166_alpha2=SG"`
 		PostCodeCountry   string
 		PostCodeByField   string `validate:"postcode_iso3166_alpha2_field=PostCodeCountry"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -671,6 +672,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.PostCodeByField",
 			expected: "PostCodeByField sai định dạng postcode của quốc gia tương ứng thuộc trường PostCodeCountry",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image phải là một hình ảnh hợp lệ",
+		},
 	}
 
 	for _, tt := range tests {

translations/zh/zh.go

@@ -1428,6 +1428,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return t
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} 必须是有效图像",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/zh/zh_test.go

@@ -148,6 +148,7 @@ func TestTranslations(t *testing.T) {
 		LowercaseString       string    `validate:"lowercase"`
 		UppercaseString       string    `validate:"uppercase"`
 		Datetime              string    `validate:"datetime=2006-01-02"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -676,6 +677,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.Datetime",
 			expected: "Datetime的格式必须是2006-01-02",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image 必须是有效图像",
+		},
 	}
 
 	for _, tt := range tests {

translations/zh_tw/zh_tw.go

@@ -1324,6 +1324,11 @@ func RegisterDefaultTranslations(v *validator.Validate, trans ut.Translator) (er
 				return t
 			},
 		},
+		{
+			tag:         "image",
+			translation: "{0} 必須是有效圖像",
+			override:    false,
+		},
 	}
 
 	for _, t := range translations {

translations/zh_tw/zh_tw_test.go

@@ -140,6 +140,7 @@ func TestTranslations(t *testing.T) {
 		OneOfString       string    `validate:"oneof=red green"`
 		OneOfInt          int       `validate:"oneof=5 63"`
 		Datetime          string    `validate:"datetime=2006-01-02"`
+		Image			  string			`validate:"image"`
 	}
 
 	var test Test
@@ -626,6 +627,10 @@ func TestTranslations(t *testing.T) {
 			ns:       "Test.Datetime",
 			expected: "Datetime與2006-01-02格式不匹配",
 		},
+		{
+			ns: "Test.Image",
+			expected: "Image 必須是有效圖像",
+		},
 	}
 
 	for _, tt := range tests {

validator_test.go

@@ -8,6 +8,10 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"image"
+	"image/png"
+	"image/jpeg"
+	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -5650,6 +5654,108 @@ func TestFileValidation(t *testing.T) {
 	}, "Bad field type int")
 }
 
+func TestImageValidation(t *testing.T) {
+	validate := New()
+
+	paths := map[string]string{
+		"empty": "",
+		"directory": "testdata",
+		"missing": filepath.Join("testdata", "none.png"),
+		"png": filepath.Join("testdata", "image.png"),
+		"jpeg": filepath.Join("testdata", "image.jpg"),
+		"mp3": filepath.Join("testdata", "music.mp3"),
+	}
+
+	tests := []struct {
+		title    string
+		param    string
+		expected bool
+		createImage func()
+		destroyImage func()
+	}{
+		{
+			"empty path", 
+			paths["empty"], false, 
+			func () {}, 
+			func () {},
+		},
+		{
+			"directory, not a file", 
+			paths["directory"], 
+			false,
+			func () {}, 
+			func () {},
+		},
+		{
+			"missing file", 
+			paths["missing"], 
+			false,
+			func () {}, 
+			func () {},
+		},
+		{
+			"valid png", 
+			paths["png"], 
+			true, 
+			func () {
+				img := image.NewRGBA(image.Rectangle{image.Point{0, 0}, image.Point{10, 10}})
+				f, _ := os.Create(paths["png"])
+				err := png.Encode(f, img)
+				if err != nil {
+					panic(fmt.Sprintf("Could not encode file in PNG. Error: %s", err))
+				}
+			},
+			func () {
+				os.Remove(paths["png"])
+			},
+		},
+		{
+			"valid jpeg",
+			paths["jpeg"],
+			true,
+			func () {
+				var opt jpeg.Options
+				img := image.NewGray(image.Rect(0, 0, 10, 10))
+				f, _ := os.Create(paths["jpeg"])
+				err := jpeg.Encode(f, img, &opt)
+				if err != nil {
+					panic(fmt.Sprintf("Could not encode file in JPEG. Error: %s", err))
+				}
+			},
+			func () {
+				os.Remove(paths["jpeg"])
+			},
+		},
+		{
+			"valid mp3",
+			paths["mp3"],
+			false,
+			func () {},
+			func () {},
+		},
+	}
+
+	for _, test := range tests {
+		test.createImage()
+		errs := validate.Var(test.param, "image")
+
+		if test.expected {
+			if !IsEqual(errs, nil) {
+				t.Fatalf("Test: '%s' failed Error: %s", test.title, errs)
+			}
+		} else {
+			if IsEqual(errs, nil) {
+				t.Fatalf("Test: '%s' failed Error: %s", test.title, errs)
+			}
+		}
+		test.destroyImage()
+	}
+
+	PanicMatches(t, func() {
+		_ = validate.Var(6, "file")
+	}, "Bad field type int")
+}
+
 func TestEthereumAddressValidation(t *testing.T) {
 	validate := New()