prometheus/vendor/github.com/asaskevich/govalidator/validator.go

1067 lines
27 KiB
Go

// Package govalidator is package of validators and sanitizers for strings, structs and collections.
package govalidator
import (
"encoding/json"
"fmt"
"net"
"net/url"
"reflect"
"regexp"
"sort"
"strconv"
"strings"
"time"
"unicode"
"unicode/utf8"
)
var fieldsRequiredByDefault bool
const maxURLRuneCount = 2083
const minURLRuneCount = 3
// 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
}
// IsEmail check if the string is an email.
func IsEmail(str string) bool {
// TODO uppercase letters are not supported
return rxEmail.MatchString(str)
}
// 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
}
u, err := url.Parse(str)
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) == false { //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)
}
// 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
}
// 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 {
r, _ := regexp.Compile("[^0-9]+")
sanitized := r.ReplaceAll([]byte(str), []byte(""))
if !rxCreditCard.MatchString(string(sanitized)) {
return false
}
var sum int64
var digit string
var tmpNum int64
var shouldDouble bool
for i := len(sanitized) - 1; i >= 0; i-- {
digit = string(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
}
if sum%10 == 0 {
return true
}
return false
}
// 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 {
r, _ := regexp.Compile("[\\s-]+")
sanitized := r.ReplaceAll([]byte(str), []byte(""))
var checksum int32
var i int32
if version == 10 {
if !rxISBN10.MatchString(string(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(string(sanitized)) {
return false
}
factor := []int32{1, 3}
for i = 0; i < 12; i++ {
checksum += factor[i%2] * int32(sanitized[i]-'0')
}
if (int32(sanitized[12]-'0'))-((10-(checksum%10))%10) == 0 {
return true
}
return false
}
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
}
// 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)
}
// 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)
}
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)
return split[0]
}
// 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.Struct {
var err error
structResult, err = ValidateStruct(valueField.Interface())
if err != nil {
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 _, e := range jsonError.Errors() {
switch tempErr := e.(type) {
case Error:
tempErr.Name = jsonTag
_ = tempErr
}
}
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.SplitN(tag, ",", -1)
for _, option := range options {
validationOptions := strings.Split(option, "~")
if !isValidTag(validationOptions[0]) {
continue
}
if len(validationOptions) == 2 {
optionsMap[validationOptions[0]] = validationOptions[1]
} else {
optionsMap[validationOptions[0]] = ""
}
}
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)
}
// 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...)
}
// 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 requiredOption, isRequired := options["required"]; isRequired {
if len(requiredOption) > 0 {
return false, Error{t.Name, fmt.Errorf(requiredOption), true}
}
return false, Error{t.Name, fmt.Errorf("non zero value required"), false}
} else if _, isOptional := options["optional"]; fieldsRequiredByDefault && !isOptional {
return false, Error{t.Name, fmt.Errorf("All fields are required to at least have one validation defined"), false}
}
// 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 !fieldsRequiredByDefault {
return true, nil
}
return false, Error{t.Name, fmt.Errorf("All fields are required to at least have one validation defined"), false}
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
return checkRequired(v, t, options)
}
var customTypeErrors Errors
for validatorName, customErrorMessage := range options {
if validatefunc, ok := CustomTypeTagMap.Get(validatorName); ok {
delete(options, validatorName)
if result := validatefunc(v.Interface(), o.Interface()); !result {
if len(customErrorMessage) > 0 {
customTypeErrors = append(customTypeErrors, Error{Name: t.Name, Err: fmt.Errorf(customErrorMessage), CustomErrorMessageExists: true})
continue
}
customTypeErrors = append(customTypeErrors, Error{Name: t.Name, Err: fmt.Errorf("%s does not validate as %s", fmt.Sprint(v), validatorName), CustomErrorMessageExists: false})
}
}
}
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 {
for validator := range options {
isValid = false
resultErr = Error{t.Name, fmt.Errorf(
"The following validator is invalid or can't be applied to the field: %q", validator), false}
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, customErrorMessage := range options {
var negate bool
validator := validatorSpec
customMsgExists := (len(customErrorMessage) > 0)
// Check whether the tag looks like '!something' or 'something'
if validator[0] == '!' {
validator = string(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:
field := fmt.Sprint(v) // make value into string, then validate with regex
if result := validatefunc(field, ps[1:]...); (!result && !negate) || (result && negate) {
var err error
if !negate {
if customMsgExists {
err = fmt.Errorf(customErrorMessage)
} else {
err = fmt.Errorf("%s does not validate as %s", field, validator)
}
} else {
if customMsgExists {
err = fmt.Errorf(customErrorMessage)
} else {
err = fmt.Errorf("%s does validate as %s", field, validator)
}
}
return false, Error{t.Name, err, customMsgExists}
}
default:
// type not yet supported, fail
return false, Error{t.Name, fmt.Errorf("Validator %s doesn't support kind %s", validator, v.Kind()), false}
}
}
if validatefunc, ok := TagMap[validator]; ok {
delete(options, validatorSpec)
switch v.Kind() {
case reflect.String:
field := fmt.Sprint(v) // make value into string, then validate with regex
if result := validatefunc(field); !result && !negate || result && negate {
var err error
if !negate {
if customMsgExists {
err = fmt.Errorf(customErrorMessage)
} else {
err = fmt.Errorf("%s does not validate as %s", field, validator)
}
} else {
if customMsgExists {
err = fmt.Errorf(customErrorMessage)
} else {
err = fmt.Errorf("%s does validate as %s", field, validator)
}
}
return false, Error{t.Name, err, customMsgExists}
}
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}
}
}
}
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 _, k := range sv {
resultItem, err := ValidateStruct(v.MapIndex(k).Interface())
if err != nil {
return false, err
}
result = result && resultItem
}
return result, nil
case reflect.Slice:
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 {
return false, err
}
}
result = result && resultItem
}
return result, nil
case 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 {
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 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() }