💯Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving
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validator/baked_in.go

934 lines
26 KiB

package validator
import (
"fmt"
"net"
"net/url"
"reflect"
"strconv"
"strings"
"time"
"unicode/utf8"
)
// BakedInValidators is the default map of ValidationFunc
// you can add, remove or even replace items to suite your needs,
// or even disregard and use your own map if so desired.
var BakedInValidators = map[string]Func{
"required": hasValue,
"len": hasLengthOf,
"min": hasMinOf,
"max": hasMaxOf,
"eq": isEq,
"ne": isNe,
"lt": isLt,
"lte": isLte,
"gt": isGt,
"gte": isGte,
"eqfield": isEqField,
"nefield": isNeField,
"gtefield": isGteField,
"gtfield": isGtField,
"ltefield": isLteField,
"ltfield": isLtField,
"alpha": isAlpha,
"alphanum": isAlphanum,
"numeric": isNumeric,
"number": isNumber,
"hexadecimal": isHexadecimal,
"hexcolor": isHexcolor,
"rgb": isRgb,
"rgba": isRgba,
"hsl": isHsl,
"hsla": isHsla,
"email": isEmail,
"url": isURL,
"uri": isURI,
"base64": isBase64,
"contains": contains,
"containsany": containsAny,
"containsrune": containsRune,
"excludes": excludes,
"excludesall": excludesAll,
"excludesrune": excludesRune,
"isbn": isISBN,
"isbn10": isISBN10,
"isbn13": isISBN13,
"uuid": isUUID,
"uuid3": isUUID3,
"uuid4": isUUID4,
"uuid5": isUUID5,
"ascii": isASCII,
"printascii": isPrintableASCII,
"multibyte": hasMultiByteCharacter,
"datauri": isDataURI,
"latitude": isLatitude,
"longitude": isLongitude,
"ssn": isSSN,
"ipv4": isIPv4,
"ipv6": isIPv6,
"ip": isIP,
}
func isIPv4(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
ip := net.ParseIP(field.String())
return ip != nil && ip.To4() != nil
}
func isIPv6(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
ip := net.ParseIP(field.String())
return ip != nil && ip.To4() == nil
}
func isIP(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
ip := net.ParseIP(field.String())
return ip != nil
}
func isSSN(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
if field.Len() != 11 {
return false
}
return matchesRegex(sSNRegex, field.String())
}
func isLongitude(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(longitudeRegex, field.String())
}
func isLatitude(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(latitudeRegex, field.String())
}
func isDataURI(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
uri := strings.SplitN(field.String(), ",", 2)
if len(uri) != 2 {
return false
}
if !matchesRegex(dataURIRegex, uri[0]) {
return false
}
fld := reflect.ValueOf(uri[1])
return isBase64(topStruct, currentStruct, fld, fld.Type(), fld.Kind(), param)
}
func hasMultiByteCharacter(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
if field.Len() == 0 {
return true
}
return matchesRegex(multibyteRegex, field.String())
}
func isPrintableASCII(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(printableASCIIRegex, field.String())
}
func isASCII(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(aSCIIRegex, field.String())
}
func isUUID5(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(uUID5Regex, field.String())
}
func isUUID4(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(uUID4Regex, field.String())
}
func isUUID3(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(uUID3Regex, field.String())
}
func isUUID(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(uUIDRegex, field.String())
}
func isISBN(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return isISBN10(topStruct, currentStruct, field, fieldType, fieldKind, param) || isISBN13(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
func isISBN13(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
s := strings.Replace(strings.Replace(field.String(), "-", "", 4), " ", "", 4)
if !matchesRegex(iSBN13Regex, s) {
return false
}
var checksum int32
var i int32
factor := []int32{1, 3}
for i = 0; i < 12; i++ {
checksum += factor[i%2] * int32(s[i]-'0')
}
if (int32(s[12]-'0'))-((10-(checksum%10))%10) == 0 {
return true
}
return false
}
func isISBN10(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
s := strings.Replace(strings.Replace(field.String(), "-", "", 3), " ", "", 3)
if !matchesRegex(iSBN10Regex, s) {
return false
}
var checksum int32
var i int32
for i = 0; i < 9; i++ {
checksum += (i + 1) * int32(s[i]-'0')
}
if s[9] == 'X' {
checksum += 10 * 10
} else {
checksum += 10 * int32(s[9]-'0')
}
if checksum%11 == 0 {
return true
}
return false
}
func excludesRune(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return !containsRune(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
func excludesAll(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return !containsAny(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
func excludes(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return !contains(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
func containsRune(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
r, _ := utf8.DecodeRuneInString(param)
return strings.ContainsRune(field.String(), r)
}
func containsAny(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return strings.ContainsAny(field.String(), param)
}
func contains(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return strings.Contains(field.String(), param)
}
func isNeField(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return !isEqField(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
func isNe(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return !isEq(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
func isEqField(topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
// if current == nil {
if !current.IsValid() {
panic("struct or field value not passed for cross validation")
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch current.Kind() {
case reflect.Struct:
if current.Type() == timeType || current.Type() == timePtrType {
break
}
current = current.FieldByName(param)
if current.Kind() == reflect.Invalid {
panic(fmt.Sprintf("Field \"%s\" not found in struct", param))
}
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch fieldKind {
case reflect.String:
return field.String() == current.String()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return field.Int() == current.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return field.Uint() == current.Uint()
case reflect.Float32, reflect.Float64:
return field.Float() == current.Float()
case reflect.Slice, reflect.Map, reflect.Array:
return int64(field.Len()) == int64(current.Len())
case reflect.Struct:
if fieldType == timeType || fieldType == timePtrType {
if current.Type() != timeType && current.Type() != timePtrType {
panic("Bad Top Level field type")
}
t := current.Interface().(time.Time)
fieldTime := field.Interface().(time.Time)
return fieldTime.Equal(t)
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isEq(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
return field.String() == param
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(field.Len()) == p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return field.Int() == p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return field.Uint() == p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return field.Float() == p
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isBase64(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(base64Regex, field.String())
}
func isURI(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
_, err := url.ParseRequestURI(field.String())
return err == nil
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isURL(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
url, err := url.ParseRequestURI(field.String())
if err != nil {
return false
}
if len(url.Scheme) == 0 {
return false
}
return err == nil
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isEmail(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(emailRegex, field.String())
}
func isHsla(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(hslaRegex, field.String())
}
func isHsl(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(hslRegex, field.String())
}
func isRgba(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(rgbaRegex, field.String())
}
func isRgb(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(rgbRegex, field.String())
}
func isHexcolor(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(hexcolorRegex, field.String())
}
func isHexadecimal(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(hexadecimalRegex, field.String())
}
func isNumber(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(numberRegex, field.String())
}
func isNumeric(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(numericRegex, field.String())
}
func isAlphanum(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(alphaNumericRegex, field.String())
}
func isAlpha(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return matchesRegex(alphaRegex, field.String())
}
func hasValue(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.Slice, reflect.Map, reflect.Ptr, reflect.Interface, reflect.Chan, reflect.Func:
return !field.IsNil()
default:
return field.IsValid() && field.Interface() != reflect.Zero(fieldType).Interface()
}
}
func isGteField(topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
if !current.IsValid() {
panic("struct not passed for cross validation")
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch current.Kind() {
case reflect.Struct:
if current.Type() == timeType || current.Type() == timePtrType {
break
}
current = current.FieldByName(param)
if current.Kind() == reflect.Invalid {
panic(fmt.Sprintf("Field \"%s\" not found in struct", param))
}
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch fieldKind {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return field.Int() >= current.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return field.Uint() >= current.Uint()
case reflect.Float32, reflect.Float64:
return field.Float() >= current.Float()
case reflect.Struct:
if field.Type() == timeType || field.Type() == timePtrType {
if current.Type() != timeType && current.Type() != timePtrType {
panic("Bad Top Level field type")
}
t := current.Interface().(time.Time)
fieldTime := field.Interface().(time.Time)
return fieldTime.After(t) || fieldTime.Equal(t)
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isGtField(topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
if !current.IsValid() {
panic("struct not passed for cross validation")
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch current.Kind() {
case reflect.Struct:
if current.Type() == timeType || current.Type() == timePtrType {
break
}
current = current.FieldByName(param)
if current.Kind() == reflect.Invalid {
panic(fmt.Sprintf("Field \"%s\" not found in struct", param))
}
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch fieldKind {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return field.Int() > current.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return field.Uint() > current.Uint()
case reflect.Float32, reflect.Float64:
return field.Float() > current.Float()
case reflect.Struct:
if field.Type() == timeType || field.Type() == timePtrType {
if current.Type() != timeType && current.Type() != timePtrType {
panic("Bad Top Level field type")
}
t := current.Interface().(time.Time)
fieldTime := field.Interface().(time.Time)
return fieldTime.After(t)
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isGte(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
p := asInt(param)
return int64(utf8.RuneCountInString(field.String())) >= p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(field.Len()) >= p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return field.Int() >= p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return field.Uint() >= p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return field.Float() >= p
case reflect.Struct:
if fieldType == timeType || fieldType == timePtrType {
now := time.Now().UTC()
t := field.Interface().(time.Time)
return t.After(now) || t.Equal(now)
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isGt(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
p := asInt(param)
return int64(utf8.RuneCountInString(field.String())) > p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(field.Len()) > p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return field.Int() > p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return field.Uint() > p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return field.Float() > p
case reflect.Struct:
if field.Type() == timeType || field.Type() == timePtrType {
return field.Interface().(time.Time).After(time.Now().UTC())
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
// length tests whether a variable's length is equal to a given
// value. For strings it tests the number of characters whereas
// for maps and slices it tests the number of items.
func hasLengthOf(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
p := asInt(param)
return int64(utf8.RuneCountInString(field.String())) == p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(field.Len()) == p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return field.Int() == p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return field.Uint() == p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return field.Float() == p
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
// min tests whether a variable value is larger or equal to a given
// number. For number types, it's a simple lesser-than test; for
// strings it tests the number of characters whereas for maps
// and slices it tests the number of items.
func hasMinOf(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return isGte(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
func isLteField(topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
if !current.IsValid() {
panic("struct not passed for cross validation")
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch current.Kind() {
case reflect.Struct:
if current.Type() == timeType || current.Type() == timePtrType {
break
}
current = current.FieldByName(param)
if current.Kind() == reflect.Invalid {
panic(fmt.Sprintf("Field \"%s\" not found in struct", param))
}
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch fieldKind {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return field.Int() <= current.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return field.Uint() <= current.Uint()
case reflect.Float32, reflect.Float64:
return field.Float() <= current.Float()
case reflect.Struct:
if field.Type() == timeType || field.Type() == timePtrType {
if current.Type() != timeType && current.Type() != timePtrType {
panic("Bad Top Level field type")
}
t := current.Interface().(time.Time)
fieldTime := field.Interface().(time.Time)
return fieldTime.Before(t) || fieldTime.Equal(t)
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isLtField(topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
if !current.IsValid() {
panic("struct not passed for cross validation")
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch current.Kind() {
case reflect.Struct:
if current.Type() == timeType || current.Type() == timePtrType {
break
}
current = current.FieldByName(param)
if current.Kind() == reflect.Invalid {
panic(fmt.Sprintf("Field \"%s\" not found in struct", param))
}
}
if current.Kind() == reflect.Ptr && !current.IsNil() {
current = current.Elem()
}
switch fieldKind {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return field.Int() < current.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return field.Uint() < current.Uint()
case reflect.Float32, reflect.Float64:
return field.Float() < current.Float()
case reflect.Struct:
if field.Type() == timeType || field.Type() == timePtrType {
if current.Type() != timeType && current.Type() != timePtrType {
panic("Bad Top Level field type")
}
t := current.Interface().(time.Time)
fieldTime := field.Interface().(time.Time)
return fieldTime.Before(t)
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isLte(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
p := asInt(param)
return int64(utf8.RuneCountInString(field.String())) <= p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(field.Len()) <= p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return field.Int() <= p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return field.Uint() <= p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return field.Float() <= p
case reflect.Struct:
if fieldType == timeType || fieldType == timePtrType {
now := time.Now().UTC()
t := field.Interface().(time.Time)
return t.Before(now) || t.Equal(now)
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
func isLt(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
switch fieldKind {
case reflect.String:
p := asInt(param)
return int64(utf8.RuneCountInString(field.String())) < p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(field.Len()) < p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return field.Int() < p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return field.Uint() < p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return field.Float() < p
case reflect.Struct:
if field.Type() == timeType || field.Type() == timePtrType {
return field.Interface().(time.Time).Before(time.Now().UTC())
}
}
panic(fmt.Sprintf("Bad field type %T", field.Interface()))
}
// max tests whether a variable value is lesser than a given
// value. For numbers, it's a simple lesser-than test; for
// strings it tests the number of characters whereas for maps
// and slices it tests the number of items.
func hasMaxOf(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool {
return isLte(topStruct, currentStruct, field, fieldType, fieldKind, param)
}
// asInt retuns the parameter as a int64
// or panics if it can't convert
func asInt(param string) int64 {
i, err := strconv.ParseInt(param, 0, 64)
panicIf(err)
return i
}
// asUint returns the parameter as a uint64
// or panics if it can't convert
func asUint(param string) uint64 {
i, err := strconv.ParseUint(param, 0, 64)
panicIf(err)
return i
}
// asFloat returns the parameter as a float64
// or panics if it can't convert
func asFloat(param string) float64 {
i, err := strconv.ParseFloat(param, 64)
panicIf(err)
return i
}
func panicIf(err error) {
if err != nil {
panic(err.Error())
}
}