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// Package govalidator is package of validators and sanitizers for strings, structs and collections.
package govalidator
import (
"bytes"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"fmt"
"io/ioutil"
"net"
"net/url"
"reflect"
"regexp"
"sort"
"strconv"
"strings"
"time"
"unicode"
"unicode/utf8"
)
var (
fieldsRequiredByDefault bool
nilPtrAllowedByRequired = false
notNumberRegexp = regexp.MustCompile("[^0-9]+")
whiteSpacesAndMinus = regexp.MustCompile(`[\s-]+`)
paramsRegexp = regexp.MustCompile(`\(.*\)$`)
)
const maxURLRuneCount = 2083
const minURLRuneCount = 3
const RF3339WithoutZone = "2006-01-02T15:04:05"
// SetFieldsRequiredByDefault causes validation to fail when struct fields
// do not include validations or are not explicitly marked as exempt (using `valid:"-"` or `valid:"email,optional"`).
// This struct definition will fail govalidator.ValidateStruct() (and the field values do not matter):
// type exampleStruct struct {
// Name string ``
// Email string `valid:"email"`
// This, however, will only fail when Email is empty or an invalid email address:
// type exampleStruct2 struct {
// Name string `valid:"-"`
// Email string `valid:"email"`
// Lastly, this will only fail when Email is an invalid email address but not when it's empty:
// type exampleStruct2 struct {
// Name string `valid:"-"`
// Email string `valid:"email,optional"`
func SetFieldsRequiredByDefault(value bool) {
fieldsRequiredByDefault = value
}
// SetNilPtrAllowedByRequired causes validation to pass for nil ptrs when a field is set to required.
// The validation will still reject ptr fields in their zero value state. Example with this enabled:
// type exampleStruct struct {
// Name *string `valid:"required"`
// With `Name` set to "", this will be considered invalid input and will cause a validation error.
// With `Name` set to nil, this will be considered valid by validation.
// By default this is disabled.
func SetNilPtrAllowedByRequired(value bool) {
nilPtrAllowedByRequired = value
}
// IsEmail check if the string is an email.
func IsEmail(str string) bool {
// TODO uppercase letters are not supported
return rxEmail.MatchString(str)
}
// IsExistingEmail check if the string is an email of existing domain
func IsExistingEmail(email string) bool {
if len(email) < 6 || len(email) > 254 {
return false
}
at := strings.LastIndex(email, "@")
if at <= 0 || at > len(email)-3 {
return false
}
user := email[:at]
host := email[at+1:]
if len(user) > 64 {
return false
}
if userDotRegexp.MatchString(user) || !userRegexp.MatchString(user) || !hostRegexp.MatchString(host) {
return false
}
switch host {
case "localhost", "example.com":
return true
}
if _, err := net.LookupMX(host); err != nil {
if _, err := net.LookupIP(host); err != nil {
return false
}
}
return true
}
// IsURL check if the string is an URL.
func IsURL(str string) bool {
if str == "" || utf8.RuneCountInString(str) >= maxURLRuneCount || len(str) <= minURLRuneCount || strings.HasPrefix(str, ".") {
return false
}
strTemp := str
if strings.Contains(str, ":") && !strings.Contains(str, "://") {
// support no indicated urlscheme but with colon for port number
// http:// is appended so url.Parse will succeed, strTemp used so it does not impact rxURL.MatchString
strTemp = "http://" + str
}
u, err := url.Parse(strTemp)
if err != nil {
return false
}
if strings.HasPrefix(u.Host, ".") {
return false
}
if u.Host == "" && (u.Path != "" && !strings.Contains(u.Path, ".")) {
return false
}
return rxURL.MatchString(str)
}
// IsRequestURL check if the string rawurl, assuming
// it was received in an HTTP request, is a valid
// URL confirm to RFC 3986
func IsRequestURL(rawurl string) bool {
url, err := url.ParseRequestURI(rawurl)
if err != nil {
return false //Couldn't even parse the rawurl
}
if len(url.Scheme) == 0 {
return false //No Scheme found
}
return true
}
// IsRequestURI check if the string rawurl, assuming
// it was received in an HTTP request, is an
// absolute URI or an absolute path.
func IsRequestURI(rawurl string) bool {
_, err := url.ParseRequestURI(rawurl)
return err == nil
}
// IsAlpha check if the string contains only letters (a-zA-Z). Empty string is valid.
func IsAlpha(str string) bool {
if IsNull(str) {
return true
}
return rxAlpha.MatchString(str)
}
//IsUTFLetter check if the string contains only unicode letter characters.
//Similar to IsAlpha but for all languages. Empty string is valid.
func IsUTFLetter(str string) bool {
if IsNull(str) {
return true
}
for _, c := range str {
if !unicode.IsLetter(c) {
return false
}
}
return true
}
// IsAlphanumeric check if the string contains only letters and numbers. Empty string is valid.
func IsAlphanumeric(str string) bool {
if IsNull(str) {
return true
}
return rxAlphanumeric.MatchString(str)
}
// IsUTFLetterNumeric check if the string contains only unicode letters and numbers. Empty string is valid.
func IsUTFLetterNumeric(str string) bool {
if IsNull(str) {
return true
}
for _, c := range str {
if !unicode.IsLetter(c) && !unicode.IsNumber(c) { //letters && numbers are ok
return false
}
}
return true
}
// IsNumeric check if the string contains only numbers. Empty string is valid.
func IsNumeric(str string) bool {
if IsNull(str) {
return true
}
return rxNumeric.MatchString(str)
}
// IsUTFNumeric check if the string contains only unicode numbers of any kind.
// Numbers can be 0-9 but also Fractions ¾,Roman Ⅸ and Hangzhou 〩. Empty string is valid.
func IsUTFNumeric(str string) bool {
if IsNull(str) {
return true
}
if strings.IndexAny(str, "+-") > 0 {
return false
}
if len(str) > 1 {
str = strings.TrimPrefix(str, "-")
str = strings.TrimPrefix(str, "+")
}
for _, c := range str {
if !unicode.IsNumber(c) { //numbers && minus sign are ok
return false
}
}
return true
}
// IsUTFDigit check if the string contains only unicode radix-10 decimal digits. Empty string is valid.
func IsUTFDigit(str string) bool {
if IsNull(str) {
return true
}
if strings.IndexAny(str, "+-") > 0 {
return false
}
if len(str) > 1 {
str = strings.TrimPrefix(str, "-")
str = strings.TrimPrefix(str, "+")
}
for _, c := range str {
if !unicode.IsDigit(c) { //digits && minus sign are ok
return false
}
}
return true
}
// IsHexadecimal check if the string is a hexadecimal number.
func IsHexadecimal(str string) bool {
return rxHexadecimal.MatchString(str)
}
// IsHexcolor check if the string is a hexadecimal color.
func IsHexcolor(str string) bool {
return rxHexcolor.MatchString(str)
}
// IsRGBcolor check if the string is a valid RGB color in form rgb(RRR, GGG, BBB).
func IsRGBcolor(str string) bool {
return rxRGBcolor.MatchString(str)
}
// IsLowerCase check if the string is lowercase. Empty string is valid.
func IsLowerCase(str string) bool {
if IsNull(str) {
return true
}
return str == strings.ToLower(str)
}
// IsUpperCase check if the string is uppercase. Empty string is valid.
func IsUpperCase(str string) bool {
if IsNull(str) {
return true
}
return str == strings.ToUpper(str)
}
// HasLowerCase check if the string contains at least 1 lowercase. Empty string is valid.
func HasLowerCase(str string) bool {
if IsNull(str) {
return true
}
return rxHasLowerCase.MatchString(str)
}
// HasUpperCase check if the string contians as least 1 uppercase. Empty string is valid.
func HasUpperCase(str string) bool {
if IsNull(str) {
return true
}
return rxHasUpperCase.MatchString(str)
}
// IsInt check if the string is an integer. Empty string is valid.
func IsInt(str string) bool {
if IsNull(str) {
return true
}
return rxInt.MatchString(str)
}
// IsFloat check if the string is a float.
func IsFloat(str string) bool {
return str != "" && rxFloat.MatchString(str)
}
// IsDivisibleBy check if the string is a number that's divisible by another.
// If second argument is not valid integer or zero, it's return false.
// Otherwise, if first argument is not valid integer or zero, it's return true (Invalid string converts to zero).
func IsDivisibleBy(str, num string) bool {
f, _ := ToFloat(str)
p := int64(f)
q, _ := ToInt(num)
if q == 0 {
return false
}
return (p == 0) || (p%q == 0)
}
// IsNull check if the string is null.
func IsNull(str string) bool {
return len(str) == 0
}
// HasWhitespaceOnly checks the string only contains whitespace
func HasWhitespaceOnly(str string) bool {
return len(str) > 0 && rxHasWhitespaceOnly.MatchString(str)
}
// HasWhitespace checks if the string contains any whitespace
func HasWhitespace(str string) bool {
return len(str) > 0 && rxHasWhitespace.MatchString(str)
}
// IsByteLength check if the string's length (in bytes) falls in a range.
func IsByteLength(str string, min, max int) bool {
return len(str) >= min && len(str) <= max
}
// IsUUIDv3 check if the string is a UUID version 3.
func IsUUIDv3(str string) bool {
return rxUUID3.MatchString(str)
}
// IsUUIDv4 check if the string is a UUID version 4.
func IsUUIDv4(str string) bool {
return rxUUID4.MatchString(str)
}
// IsUUIDv5 check if the string is a UUID version 5.
func IsUUIDv5(str string) bool {
return rxUUID5.MatchString(str)
}
// IsUUID check if the string is a UUID (version 3, 4 or 5).
func IsUUID(str string) bool {
return rxUUID.MatchString(str)
}
// IsCreditCard check if the string is a credit card.
func IsCreditCard(str string) bool {
sanitized := notNumberRegexp.ReplaceAllString(str, "")
if !rxCreditCard.MatchString(sanitized) {
return false
}
var sum int64
var digit string
var tmpNum int64
var shouldDouble bool
for i := len(sanitized) - 1; i >= 0; i-- {
digit = sanitized[i:(i + 1)]
tmpNum, _ = ToInt(digit)
if shouldDouble {
tmpNum *= 2
if tmpNum >= 10 {
sum += ((tmpNum % 10) + 1)
} else {
sum += tmpNum
}
} else {
sum += tmpNum
}
shouldDouble = !shouldDouble
}
return sum%10 == 0
}
// IsISBN10 check if the string is an ISBN version 10.
func IsISBN10(str string) bool {
return IsISBN(str, 10)
}
// IsISBN13 check if the string is an ISBN version 13.
func IsISBN13(str string) bool {
return IsISBN(str, 13)
}
// IsISBN check if the string is an ISBN (version 10 or 13).
// If version value is not equal to 10 or 13, it will be check both variants.
func IsISBN(str string, version int) bool {
sanitized := whiteSpacesAndMinus.ReplaceAllString(str, "")
var checksum int32
var i int32
if version == 10 {
if !rxISBN10.MatchString(sanitized) {
return false
}
for i = 0; i < 9; i++ {
checksum += (i + 1) * int32(sanitized[i]-'0')
}
if sanitized[9] == 'X' {
checksum += 10 * 10
} else {
checksum += 10 * int32(sanitized[9]-'0')
}
if checksum%11 == 0 {
return true
}
return false
} else if version == 13 {
if !rxISBN13.MatchString(sanitized) {
return false
}
factor := []int32{1, 3}
for i = 0; i < 12; i++ {
checksum += factor[i%2] * int32(sanitized[i]-'0')
}
return (int32(sanitized[12]-'0'))-((10-(checksum%10))%10) == 0
}
return IsISBN(str, 10) || IsISBN(str, 13)
}
// IsJSON check if the string is valid JSON (note: uses json.Unmarshal).
func IsJSON(str string) bool {
var js json.RawMessage
return json.Unmarshal([]byte(str), &js) == nil
}
// IsMultibyte check if the string contains one or more multibyte chars. Empty string is valid.
func IsMultibyte(str string) bool {
if IsNull(str) {
return true
}
return rxMultibyte.MatchString(str)
}
// IsASCII check if the string contains ASCII chars only. Empty string is valid.
func IsASCII(str string) bool {
if IsNull(str) {
return true
}
return rxASCII.MatchString(str)
}
// IsPrintableASCII check if the string contains printable ASCII chars only. Empty string is valid.
func IsPrintableASCII(str string) bool {
if IsNull(str) {
return true
}
return rxPrintableASCII.MatchString(str)
}
// IsFullWidth check if the string contains any full-width chars. Empty string is valid.
func IsFullWidth(str string) bool {
if IsNull(str) {
return true
}
return rxFullWidth.MatchString(str)
}
// IsHalfWidth check if the string contains any half-width chars. Empty string is valid.
func IsHalfWidth(str string) bool {
if IsNull(str) {
return true
}
return rxHalfWidth.MatchString(str)
}
// IsVariableWidth check if the string contains a mixture of full and half-width chars. Empty string is valid.
func IsVariableWidth(str string) bool {
if IsNull(str) {
return true
}
return rxHalfWidth.MatchString(str) && rxFullWidth.MatchString(str)
}
// IsBase64 check if a string is base64 encoded.
func IsBase64(str string) bool {
return rxBase64.MatchString(str)
}
// IsFilePath check is a string is Win or Unix file path and returns it's type.
func IsFilePath(str string) (bool, int) {
if rxWinPath.MatchString(str) {
//check windows path limit see:
// http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx#maxpath
if len(str[3:]) > 32767 {
return false, Win
}
return true, Win
} else if rxUnixPath.MatchString(str) {
return true, Unix
}
return false, Unknown
}
// IsDataURI checks if a string is base64 encoded data URI such as an image
func IsDataURI(str string) bool {
dataURI := strings.Split(str, ",")
if !rxDataURI.MatchString(dataURI[0]) {
return false
}
return IsBase64(dataURI[1])
}
// IsISO3166Alpha2 checks if a string is valid two-letter country code
func IsISO3166Alpha2(str string) bool {
for _, entry := range ISO3166List {
if str == entry.Alpha2Code {
return true
}
}
return false
}
// IsISO3166Alpha3 checks if a string is valid three-letter country code
func IsISO3166Alpha3(str string) bool {
for _, entry := range ISO3166List {
if str == entry.Alpha3Code {
return true
}
}
return false
}
// IsISO693Alpha2 checks if a string is valid two-letter language code
func IsISO693Alpha2(str string) bool {
for _, entry := range ISO693List {
if str == entry.Alpha2Code {
return true
}
}
return false
}
// IsISO693Alpha3b checks if a string is valid three-letter language code
func IsISO693Alpha3b(str string) bool {
for _, entry := range ISO693List {
if str == entry.Alpha3bCode {
return true
}
}
return false
}
// IsDNSName will validate the given string as a DNS name
func IsDNSName(str string) bool {
if str == "" || len(strings.Replace(str, ".", "", -1)) > 255 {
// constraints already violated
return false
}
return !IsIP(str) && rxDNSName.MatchString(str)
}
// IsHash checks if a string is a hash of type algorithm.
// Algorithm is one of ['md4', 'md5', 'sha1', 'sha256', 'sha384', 'sha512', 'ripemd128', 'ripemd160', 'tiger128', 'tiger160', 'tiger192', 'crc32', 'crc32b']
func IsHash(str string, algorithm string) bool {
len := "0"
algo := strings.ToLower(algorithm)
if algo == "crc32" || algo == "crc32b" {
len = "8"
} else if algo == "md5" || algo == "md4" || algo == "ripemd128" || algo == "tiger128" {
len = "32"
} else if algo == "sha1" || algo == "ripemd160" || algo == "tiger160" {
len = "40"
} else if algo == "tiger192" {
len = "48"
} else if algo == "sha256" {
len = "64"
} else if algo == "sha384" {
len = "96"
} else if algo == "sha512" {
len = "128"
} else {
return false
}
return Matches(str, "^[a-f0-9]{"+len+"}$")
}
// IsDialString validates the given string for usage with the various Dial() functions
func IsDialString(str string) bool {
if h, p, err := net.SplitHostPort(str); err == nil && h != "" && p != "" && (IsDNSName(h) || IsIP(h)) && IsPort(p) {
return true
}
return false
}
// IsIP checks if a string is either IP version 4 or 6.
func IsIP(str string) bool {
return net.ParseIP(str) != nil
}
// IsPort checks if a string represents a valid port
func IsPort(str string) bool {
if i, err := strconv.Atoi(str); err == nil && i > 0 && i < 65536 {
return true
}
return false
}
// IsIPv4 check if the string is an IP version 4.
func IsIPv4(str string) bool {
ip := net.ParseIP(str)
return ip != nil && strings.Contains(str, ".")
}
// IsIPv6 check if the string is an IP version 6.
func IsIPv6(str string) bool {
ip := net.ParseIP(str)
return ip != nil && strings.Contains(str, ":")
}
// IsCIDR check if the string is an valid CIDR notiation (IPV4 & IPV6)
func IsCIDR(str string) bool {
_, _, err := net.ParseCIDR(str)
return err == nil
}
// IsMAC check if a string is valid MAC address.
// Possible MAC formats:
// 01:23:45:67:89:ab
// 01:23:45:67:89:ab:cd:ef
// 01-23-45-67-89-ab
// 01-23-45-67-89-ab-cd-ef
// 0123.4567.89ab
// 0123.4567.89ab.cdef
func IsMAC(str string) bool {
_, err := net.ParseMAC(str)
return err == nil
}
// IsHost checks if the string is a valid IP (both v4 and v6) or a valid DNS name
func IsHost(str string) bool {
return IsIP(str) || IsDNSName(str)
}
// IsMongoID check if the string is a valid hex-encoded representation of a MongoDB ObjectId.
func IsMongoID(str string) bool {
return rxHexadecimal.MatchString(str) && (len(str) == 24)
}
// IsLatitude check if a string is valid latitude.
func IsLatitude(str string) bool {
return rxLatitude.MatchString(str)
}
// IsLongitude check if a string is valid longitude.
func IsLongitude(str string) bool {
return rxLongitude.MatchString(str)
}
// IsRsaPublicKey check if a string is valid public key with provided length
func IsRsaPublicKey(str string, keylen int) bool {
bb := bytes.NewBufferString(str)
pemBytes, err := ioutil.ReadAll(bb)
if err != nil {
return false
}
block, _ := pem.Decode(pemBytes)
if block != nil && block.Type != "PUBLIC KEY" {
return false
}
var der []byte
if block != nil {
der = block.Bytes
} else {
der, err = base64.StdEncoding.DecodeString(str)
if err != nil {
return false
}
}
key, err := x509.ParsePKIXPublicKey(der)
if err != nil {
return false
}
pubkey, ok := key.(*rsa.PublicKey)
if !ok {
return false
}
bitlen := len(pubkey.N.Bytes()) * 8
return bitlen == int(keylen)
}
func toJSONName(tag string) string {
if tag == "" {
return ""
}
// JSON name always comes first. If there's no options then split[0] is
// JSON name, if JSON name is not set, then split[0] is an empty string.
split := strings.SplitN(tag, ",", 2)
name := split[0]
// However it is possible that the field is skipped when
// (de-)serializing from/to JSON, in which case assume that there is no
// tag name to use
if name == "-" {
return ""
}
return name
}
func PrependPathToErrors(err error, path string) error {
switch err2 := err.(type) {
case Error:
err2.Path = append([]string{path}, err2.Path...)
return err2
case Errors:
errors := err2.Errors()
for i, err3 := range errors {
errors[i] = PrependPathToErrors(err3, path)
}
return err2
}
fmt.Println(err)
return err
}
// ValidateStruct use tags for fields.
// result will be equal to `false` if there are any errors.
func ValidateStruct(s interface{}) (bool, error) {
if s == nil {
return true, nil
}
result := true
var err error
val := reflect.ValueOf(s)
if val.Kind() == reflect.Interface || val.Kind() == reflect.Ptr {
val = val.Elem()
}
// we only accept structs
if val.Kind() != reflect.Struct {
return false, fmt.Errorf("function only accepts structs; got %s", val.Kind())
}
var errs Errors
for i := 0; i < val.NumField(); i++ {
valueField := val.Field(i)
typeField := val.Type().Field(i)
if typeField.PkgPath != "" {
continue // Private field
}
structResult := true
if valueField.Kind() == reflect.Interface {
valueField = valueField.Elem()
}
if (valueField.Kind() == reflect.Struct ||
(valueField.Kind() == reflect.Ptr && valueField.Elem().Kind() == reflect.Struct)) &&
typeField.Tag.Get(tagName) != "-" {
var err error
structResult, err = ValidateStruct(valueField.Interface())
if err != nil {
err = PrependPathToErrors(err, typeField.Name)
errs = append(errs, err)
}
}
resultField, err2 := typeCheck(valueField, typeField, val, nil)
if err2 != nil {
// Replace structure name with JSON name if there is a tag on the variable
jsonTag := toJSONName(typeField.Tag.Get("json"))
if jsonTag != "" {
switch jsonError := err2.(type) {
case Error:
jsonError.Name = jsonTag
err2 = jsonError
case Errors:
for i2, err3 := range jsonError {
switch customErr := err3.(type) {
case Error:
customErr.Name = jsonTag
jsonError[i2] = customErr
}
}
err2 = jsonError
}
}
errs = append(errs, err2)
}
result = result && resultField && structResult
}
if len(errs) > 0 {
err = errs
}
return result, err
}
// parseTagIntoMap parses a struct tag `valid:required~Some error message,length(2|3)` into map[string]string{"required": "Some error message", "length(2|3)": ""}
func parseTagIntoMap(tag string) tagOptionsMap {
optionsMap := make(tagOptionsMap)
options := strings.Split(tag, ",")
for i, option := range options {
option = strings.TrimSpace(option)
validationOptions := strings.Split(option, "~")
if !isValidTag(validationOptions[0]) {
continue
}
if len(validationOptions) == 2 {
optionsMap[validationOptions[0]] = tagOption{validationOptions[0], validationOptions[1], i}
} else {
optionsMap[validationOptions[0]] = tagOption{validationOptions[0], "", i}
}
}
return optionsMap
}
func isValidTag(s string) bool {
if s == "" {
return false
}
for _, c := range s {
switch {
case strings.ContainsRune("\\'\"!#$%&()*+-./:<=>?@[]^_{|}~ ", c):
// Backslash and quote chars are reserved, but
// otherwise any punctuation chars are allowed
// in a tag name.
default:
if !unicode.IsLetter(c) && !unicode.IsDigit(c) {
return false
}
}
}
return true
}
// IsSSN will validate the given string as a U.S. Social Security Number
func IsSSN(str string) bool {
if str == "" || len(str) != 11 {
return false
}
return rxSSN.MatchString(str)
}
// IsSemver check if string is valid semantic version
func IsSemver(str string) bool {
return rxSemver.MatchString(str)
}
// IsTime check if string is valid according to given format
func IsTime(str string, format string) bool {
_, err := time.Parse(format, str)
return err == nil
}
// IsRFC3339 check if string is valid timestamp value according to RFC3339
func IsRFC3339(str string) bool {
return IsTime(str, time.RFC3339)
}
// IsRFC3339WithoutZone check if string is valid timestamp value according to RFC3339 which excludes the timezone.
func IsRFC3339WithoutZone(str string) bool {
return IsTime(str, RF3339WithoutZone)
}
// IsISO4217 check if string is valid ISO currency code
func IsISO4217(str string) bool {
for _, currency := range ISO4217List {
if str == currency {
return true
}
}
return false
}
// ByteLength check string's length
func ByteLength(str string, params ...string) bool {
if len(params) == 2 {
min, _ := ToInt(params[0])
max, _ := ToInt(params[1])
return len(str) >= int(min) && len(str) <= int(max)
}
return false
}
// RuneLength check string's length
// Alias for StringLength
func RuneLength(str string, params ...string) bool {
return StringLength(str, params...)
}
// IsRsaPub check whether string is valid RSA key
// Alias for IsRsaPublicKey
func IsRsaPub(str string, params ...string) bool {
if len(params) == 1 {
len, _ := ToInt(params[0])
return IsRsaPublicKey(str, int(len))
}
return false
}
// StringMatches checks if a string matches a given pattern.
func StringMatches(s string, params ...string) bool {
if len(params) == 1 {
pattern := params[0]
return Matches(s, pattern)
}
return false
}
// StringLength check string's length (including multi byte strings)
func StringLength(str string, params ...string) bool {
if len(params) == 2 {
strLength := utf8.RuneCountInString(str)
min, _ := ToInt(params[0])
max, _ := ToInt(params[1])
return strLength >= int(min) && strLength <= int(max)
}
return false
}
// Range check string's length
func Range(str string, params ...string) bool {
if len(params) == 2 {
value, _ := ToFloat(str)
min, _ := ToFloat(params[0])
max, _ := ToFloat(params[1])
return InRange(value, min, max)
}
return false
}
func isInRaw(str string, params ...string) bool {
if len(params) == 1 {
rawParams := params[0]
parsedParams := strings.Split(rawParams, "|")
return IsIn(str, parsedParams...)
}
return false
}
// IsIn check if string str is a member of the set of strings params
func IsIn(str string, params ...string) bool {
for _, param := range params {
if str == param {
return true
}
}
return false
}
func checkRequired(v reflect.Value, t reflect.StructField, options tagOptionsMap) (bool, error) {
if nilPtrAllowedByRequired {
k := v.Kind()
if (k == reflect.Ptr || k == reflect.Interface) && v.IsNil() {
return true, nil
}
}
if requiredOption, isRequired := options["required"]; isRequired {
if len(requiredOption.customErrorMessage) > 0 {
return false, Error{t.Name, fmt.Errorf(requiredOption.customErrorMessage), true, "required", []string{}}
}
return false, Error{t.Name, fmt.Errorf("non zero value required"), false, "required", []string{}}
} else if _, isOptional := options["optional"]; fieldsRequiredByDefault && !isOptional {
return false, Error{t.Name, fmt.Errorf("Missing required field"), false, "required", []string{}}
}
// not required and empty is valid
return true, nil
}
func typeCheck(v reflect.Value, t reflect.StructField, o reflect.Value, options tagOptionsMap) (isValid bool, resultErr error) {
if !v.IsValid() {
return false, nil
}
tag := t.Tag.Get(tagName)
// Check if the field should be ignored
switch tag {
case "":
if v.Kind() != reflect.Slice && v.Kind() != reflect.Map {
if !fieldsRequiredByDefault {
return true, nil
}
return false, Error{t.Name, fmt.Errorf("All fields are required to at least have one validation defined"), false, "required", []string{}}
}
case "-":
return true, nil
}
isRootType := false
if options == nil {
isRootType = true
options = parseTagIntoMap(tag)
}
if isEmptyValue(v) {
// an empty value is not validated, check only required
isValid, resultErr = checkRequired(v, t, options)
for key := range options {
delete(options, key)
}
return isValid, resultErr
}
var customTypeErrors Errors
optionsOrder := options.orderedKeys()
for _, validatorName := range optionsOrder {
validatorStruct := options[validatorName]
if validatefunc, ok := CustomTypeTagMap.Get(validatorName); ok {
delete(options, validatorName)
if result := validatefunc(v.Interface(), o.Interface()); !result {
if len(validatorStruct.customErrorMessage) > 0 {
customTypeErrors = append(customTypeErrors, Error{Name: t.Name, Err: TruncatingErrorf(validatorStruct.customErrorMessage, fmt.Sprint(v), validatorName), CustomErrorMessageExists: true, Validator: stripParams(validatorName)})
continue
}
customTypeErrors = append(customTypeErrors, Error{Name: t.Name, Err: fmt.Errorf("%s does not validate as %s", fmt.Sprint(v), validatorName), CustomErrorMessageExists: false, Validator: stripParams(validatorName)})
}
}
}
if len(customTypeErrors.Errors()) > 0 {
return false, customTypeErrors
}
if isRootType {
// Ensure that we've checked the value by all specified validators before report that the value is valid
defer func() {
delete(options, "optional")
delete(options, "required")
if isValid && resultErr == nil && len(options) != 0 {
optionsOrder := options.orderedKeys()
for _, validator := range optionsOrder {
isValid = false
resultErr = Error{t.Name, fmt.Errorf(
"The following validator is invalid or can't be applied to the field: %q", validator), false, stripParams(validator), []string{}}
return
}
}
}()
}
switch v.Kind() {
case reflect.Bool,
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
reflect.Float32, reflect.Float64,
reflect.String:
// for each tag option check the map of validator functions
for _, validatorSpec := range optionsOrder {
validatorStruct := options[validatorSpec]
var negate bool
validator := validatorSpec
customMsgExists := len(validatorStruct.customErrorMessage) > 0
// Check whether the tag looks like '!something' or 'something'
if validator[0] == '!' {
validator = validator[1:]
negate = true
}
// Check for param validators
for key, value := range ParamTagRegexMap {
ps := value.FindStringSubmatch(validator)
if len(ps) == 0 {
continue
}
validatefunc, ok := ParamTagMap[key]
if !ok {
continue
}
delete(options, validatorSpec)
switch v.Kind() {
case reflect.String,
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
reflect.Float32, reflect.Float64:
field := fmt.Sprint(v) // make value into string, then validate with regex
if result := validatefunc(field, ps[1:]...); (!result && !negate) || (result && negate) {
if customMsgExists {
return false, Error{t.Name, TruncatingErrorf(validatorStruct.customErrorMessage, field, validator), customMsgExists, stripParams(validatorSpec), []string{}}
}
if negate {
return false, Error{t.Name, fmt.Errorf("%s does validate as %s", field, validator), customMsgExists, stripParams(validatorSpec), []string{}}
}
return false, Error{t.Name, fmt.Errorf("%s does not validate as %s", field, validator), customMsgExists, stripParams(validatorSpec), []string{}}
}
default:
// type not yet supported, fail
return false, Error{t.Name, fmt.Errorf("Validator %s doesn't support kind %s", validator, v.Kind()), false, stripParams(validatorSpec), []string{}}
}
}
if validatefunc, ok := TagMap[validator]; ok {
delete(options, validatorSpec)
switch v.Kind() {
case reflect.String,
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
reflect.Float32, reflect.Float64:
field := fmt.Sprint(v) // make value into string, then validate with regex
if result := validatefunc(field); !result && !negate || result && negate {
if customMsgExists {
return false, Error{t.Name, TruncatingErrorf(validatorStruct.customErrorMessage, field, validator), customMsgExists, stripParams(validatorSpec), []string{}}
}
if negate {
return false, Error{t.Name, fmt.Errorf("%s does validate as %s", field, validator), customMsgExists, stripParams(validatorSpec), []string{}}
}
return false, Error{t.Name, fmt.Errorf("%s does not validate as %s", field, validator), customMsgExists, stripParams(validatorSpec), []string{}}
}
default:
//Not Yet Supported Types (Fail here!)
err := fmt.Errorf("Validator %s doesn't support kind %s for value %v", validator, v.Kind(), v)
return false, Error{t.Name, err, false, stripParams(validatorSpec), []string{}}
}
}
}
return true, nil
case reflect.Map:
if v.Type().Key().Kind() != reflect.String {
return false, &UnsupportedTypeError{v.Type()}
}
var sv stringValues
sv = v.MapKeys()
sort.Sort(sv)
result := true
for i, k := range sv {
var resultItem bool
var err error
if v.MapIndex(k).Kind() != reflect.Struct {
resultItem, err = typeCheck(v.MapIndex(k), t, o, options)
if err != nil {
return false, err
}
} else {
resultItem, err = ValidateStruct(v.MapIndex(k).Interface())
if err != nil {
err = PrependPathToErrors(err, t.Name+"."+sv[i].Interface().(string))
return false, err
}
}
result = result && resultItem
}
return result, nil
case reflect.Slice, reflect.Array:
result := true
for i := 0; i < v.Len(); i++ {
var resultItem bool
var err error
if v.Index(i).Kind() != reflect.Struct {
resultItem, err = typeCheck(v.Index(i), t, o, options)
if err != nil {
return false, err
}
} else {
resultItem, err = ValidateStruct(v.Index(i).Interface())
if err != nil {
err = PrependPathToErrors(err, t.Name+"."+strconv.Itoa(i))
return false, err
}
}
result = result && resultItem
}
return result, nil
case reflect.Interface:
// If the value is an interface then encode its element
if v.IsNil() {
return true, nil
}
return ValidateStruct(v.Interface())
case reflect.Ptr:
// If the value is a pointer then check its element
if v.IsNil() {
return true, nil
}
return typeCheck(v.Elem(), t, o, options)
case reflect.Struct:
return ValidateStruct(v.Interface())
default:
return false, &UnsupportedTypeError{v.Type()}
}
}
func stripParams(validatorString string) string {
return paramsRegexp.ReplaceAllString(validatorString, "")
}
func isEmptyValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.String, reflect.Array:
return v.Len() == 0
case reflect.Map, reflect.Slice:
return v.Len() == 0 || v.IsNil()
case reflect.Bool:
return !v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Interface, reflect.Ptr:
return v.IsNil()
}
return reflect.DeepEqual(v.Interface(), reflect.Zero(v.Type()).Interface())
}
// ErrorByField returns error for specified field of the struct
// validated by ValidateStruct or empty string if there are no errors
// or this field doesn't exists or doesn't have any errors.
func ErrorByField(e error, field string) string {
if e == nil {
return ""
}
return ErrorsByField(e)[field]
}
// ErrorsByField returns map of errors of the struct validated
// by ValidateStruct or empty map if there are no errors.
func ErrorsByField(e error) map[string]string {
m := make(map[string]string)
if e == nil {
return m
}
// prototype for ValidateStruct
switch e.(type) {
case Error:
m[e.(Error).Name] = e.(Error).Err.Error()
case Errors:
for _, item := range e.(Errors).Errors() {
n := ErrorsByField(item)
for k, v := range n {
m[k] = v
}
}
}
return m
}
// Error returns string equivalent for reflect.Type
func (e *UnsupportedTypeError) Error() string {
return "validator: unsupported type: " + e.Type.String()
}
func (sv stringValues) Len() int { return len(sv) }
func (sv stringValues) Swap(i, j int) { sv[i], sv[j] = sv[j], sv[i] }
func (sv stringValues) Less(i, j int) bool { return sv.get(i) < sv.get(j) }
func (sv stringValues) get(i int) string { return sv[i].String() }
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