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generic.go
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generic.go
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// Copyright 2020 Lingfei Kong <colin404@foxmail.com>. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package validation
import (
"fmt"
"net"
"regexp"
"strings"
"unicode"
"github.com/bolo-tourism/go/pkg/validation/field"
)
const (
qnameCharFmt string = "[A-Za-z0-9]"
qnameExtCharFmt string = "[-A-Za-z0-9_.]"
qualifiedNameFmt string = "(" + qnameCharFmt + qnameExtCharFmt + "*)?" + qnameCharFmt
)
const (
qualifiedNameErrMsg string = "must consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character"
qualifiedNameMaxLength int = 63
)
var qualifiedNameRegexp = regexp.MustCompile("^" + qualifiedNameFmt + "$")
// IsQualifiedName tests whether the value passed is what IAM calls a
// "qualified name". This is a format used in various places throughout the
// system. If the value is not valid, a list of error strings is returned.
// Otherwise an empty list (or nil) is returned.
func IsQualifiedName(value string) []string {
var errs []string
parts := strings.Split(value, "/")
var name string
switch len(parts) {
case 1:
name = parts[0]
// nolint:gomnd // no need
case 2:
var prefix string
prefix, name = parts[0], parts[1]
if len(prefix) == 0 {
errs = append(errs, "prefix part "+EmptyError())
} else if msgs := IsDNS1123Subdomain(prefix); len(msgs) != 0 {
errs = append(errs, prefixEach(msgs, "prefix part ")...)
}
default:
return append(
errs,
"a qualified name "+RegexError(
qualifiedNameErrMsg,
qualifiedNameFmt,
"MyName",
"my.name",
"123-abc",
)+" with an optional DNS subdomain prefix and '/' (e.g. 'example.com/MyName')",
)
}
if len(name) == 0 {
errs = append(errs, "name part "+EmptyError())
} else if len(name) > qualifiedNameMaxLength {
errs = append(errs, "name part "+MaxLenError(qualifiedNameMaxLength))
}
if !qualifiedNameRegexp.MatchString(name) {
errs = append(
errs,
"name part "+RegexError(qualifiedNameErrMsg, qualifiedNameFmt, "MyName", "my.name", "123-abc"),
)
}
return errs
}
const labelValueFmt string = "(" + qualifiedNameFmt + ")?"
const labelValueErrMsg string = "a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character"
// LabelValueMaxLength is a label's max length.
const LabelValueMaxLength int = 63
var labelValueRegexp = regexp.MustCompile("^" + labelValueFmt + "$")
// IsValidLabelValue tests whether the value passed is a valid label value. If
// the value is not valid, a list of error strings is returned. Otherwise an
// empty list (or nil) is returned.
func IsValidLabelValue(value string) []string {
var errs []string
if len(value) > LabelValueMaxLength {
errs = append(errs, MaxLenError(LabelValueMaxLength))
}
if !labelValueRegexp.MatchString(value) {
errs = append(errs, RegexError(labelValueErrMsg, labelValueFmt, "MyValue", "my_value", "12345"))
}
return errs
}
const dns1123LabelFmt string = "[a-z0-9]([-a-z0-9]*[a-z0-9])?"
const dns1123LabelErrMsg string = "a DNS-1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character"
// DNS1123LabelMaxLength is a label's max length in DNS (RFC 1123).
const DNS1123LabelMaxLength int = 63
var dns1123LabelRegexp = regexp.MustCompile("^" + dns1123LabelFmt + "$")
// IsDNS1123Label tests for a string that conforms to the definition of a label in
// DNS (RFC 1123).
func IsDNS1123Label(value string) []string {
var errs []string
if len(value) > DNS1123LabelMaxLength {
errs = append(errs, MaxLenError(DNS1123LabelMaxLength))
}
if !dns1123LabelRegexp.MatchString(value) {
errs = append(errs, RegexError(dns1123LabelErrMsg, dns1123LabelFmt, "my-name", "123-abc"))
}
return errs
}
const dns1123SubdomainFmt string = dns1123LabelFmt + "(\\." + dns1123LabelFmt + ")*"
const dns1123SubdomainErrorMsg string = "a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character"
// DNS1123SubdomainMaxLength is a subdomain's max length in DNS (RFC 1123).
const DNS1123SubdomainMaxLength int = 253
var dns1123SubdomainRegexp = regexp.MustCompile("^" + dns1123SubdomainFmt + "$")
// IsDNS1123Subdomain tests for a string that conforms to the definition of a
// subdomain in DNS (RFC 1123).
func IsDNS1123Subdomain(value string) []string {
var errs []string
if len(value) > DNS1123SubdomainMaxLength {
errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
}
if !dns1123SubdomainRegexp.MatchString(value) {
errs = append(errs, RegexError(dns1123SubdomainErrorMsg, dns1123SubdomainFmt, "example.com"))
}
return errs
}
// IsValidPortNum tests that the argument is a valid, non-zero port number.
func IsValidPortNum(port int) []string {
if 1 <= port && port <= 65535 {
return nil
}
return []string{InclusiveRangeError(1, 65535)}
}
// IsInRange tests that the argument is in an inclusive range.
func IsInRange(value int, min int, max int) []string {
if value >= min && value <= max {
return nil
}
return []string{InclusiveRangeError(min, max)}
}
// IsValidIP tests that the argument is a valid IP address.
func IsValidIP(value string) []string {
if net.ParseIP(value) == nil {
return []string{"must be a valid IP address, (e.g. 10.9.8.7)"}
}
return nil
}
// IsValidIPv4Address tests that the argument is a valid IPv4 address.
func IsValidIPv4Address(fldPath *field.Path, value string) field.ErrorList {
var allErrors field.ErrorList
ip := net.ParseIP(value)
if ip == nil || ip.To4() == nil {
allErrors = append(allErrors, field.Invalid(fldPath, value, "must be a valid IPv4 address"))
}
return allErrors
}
// IsValidIPv6Address tests that the argument is a valid IPv6 address.
func IsValidIPv6Address(fldPath *field.Path, value string) field.ErrorList {
var allErrors field.ErrorList
ip := net.ParseIP(value)
if ip == nil || ip.To4() != nil {
allErrors = append(allErrors, field.Invalid(fldPath, value, "must be a valid IPv6 address"))
}
return allErrors
}
const (
percentFmt string = "[0-9]+%"
percentErrMsg string = "a valid percent string must be a numeric string followed by an ending '%'"
)
var percentRegexp = regexp.MustCompile("^" + percentFmt + "$")
// IsValidPercent checks that string is in the form of a percentage.
func IsValidPercent(percent string) []string {
if !percentRegexp.MatchString(percent) {
return []string{RegexError(percentErrMsg, percentFmt, "1%", "93%")}
}
return nil
}
// MaxLenError returns a string explanation of a "string too long" validation
// failure.
func MaxLenError(length int) string {
return fmt.Sprintf("must be no more than %d characters", length)
}
// RegexError returns a string explanation of a regex validation failure.
func RegexError(msg string, fmt string, examples ...string) string {
if len(examples) == 0 {
return msg + " (regex used for validation is '" + fmt + "')"
}
msg += " (e.g. "
for i := range examples {
if i > 0 {
msg += " or "
}
msg += "'" + examples[i] + "', "
}
msg += "regex used for validation is '" + fmt + "')"
return msg
}
// EmptyError returns a string explanation of a "must not be empty" validation
// failure.
func EmptyError() string {
return "must be non-empty"
}
func prefixEach(msgs []string, prefix string) []string {
for i := range msgs {
msgs[i] = prefix + msgs[i]
}
return msgs
}
// InclusiveRangeError returns a string explanation of a numeric "must be
// between" validation failure.
func InclusiveRangeError(lo, hi int) string {
return fmt.Sprintf(`must be between %d and %d, inclusive`, lo, hi)
}
const (
minPassLength = 8
maxPassLength = 16
)
// IsValidPassword validate password.
func IsValidPassword(password string) error {
var hasUpper bool
var hasLower bool
var hasNumber bool
var hasSpecial bool
var passLen int
var errorString string
for _, ch := range password {
switch {
case unicode.IsNumber(ch):
hasNumber = true
passLen++
case unicode.IsUpper(ch):
hasUpper = true
passLen++
case unicode.IsLower(ch):
hasLower = true
passLen++
case unicode.IsPunct(ch) || unicode.IsSymbol(ch):
hasSpecial = true
passLen++
case ch == ' ':
passLen++
}
}
appendError := func(err string) {
if len(strings.TrimSpace(errorString)) != 0 {
errorString += ", " + err
} else {
errorString = err
}
}
if !hasLower {
appendError("lowercase letter missing")
}
if !hasUpper {
appendError("uppercase letter missing")
}
if !hasNumber {
appendError("at least one numeric character required")
}
if !hasSpecial {
appendError("special character missing")
}
if !(minPassLength <= passLen && passLen <= maxPassLength) {
appendError(
fmt.Sprintf("password length must be between %d to %d characters long", minPassLength, maxPassLength),
)
}
if len(errorString) != 0 {
return fmt.Errorf(errorString)
}
return nil
}