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validations.go
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validations.go
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package common
import (
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"github.com/hashicorp/go-cty/cty"
"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
"net"
"net/mail"
"net/url"
"regexp"
"strconv"
"strings"
"time"
)
var numericPattern = regexp.MustCompile("^[0-9]{1,30}$")
var alphabetPattern = regexp.MustCompile("^[a-zA-Z0-9]{1,30}$")
var hostnameLabelPattern = regexp.MustCompile("^[A-Za-z\\d\\_][A-Za-z\\d\\-\\_]{0,62}[A-Za-z\\d\\_]$")
var TagPattern = regexp.MustCompile("^[a-zA-Z0-9-_]+$")
var PrivilegesPattern = regexp.MustCompile("^[a-z_]+:(read|write)$")
var HttpHeaderPattern = regexp.MustCompile("^([\\w\\-]+):(.*)$")
var DomainPattern = regexp.MustCompile("^(?:[a-z0-9](?:[a-z0-9-_]{0,61}[a-z0-9])?\\.)+[a-z0-9][a-z0-9-_]{0,61}[a-z]$")
func containsString(v string, a []string) bool {
for _, i := range a {
if i == v {
return true
}
}
return false
}
func containsInt(v int, a []int) bool {
for _, i := range a {
if i == v {
return true
}
}
return false
}
// ValidateStringENUM validates ENUM values
func ValidateStringENUM(enum ...string) func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
var diags diag.Diagnostics
inputString := input.(string)
switch {
case containsString(inputString, enum):
return diags
default:
return append(diags, diag.Diagnostic{
Severity: diag.Error,
Summary: fmt.Sprintf("\"%s\" is not one of %+v", inputString, enum),
})
}
}
}
// ValidateIntENUM validates ENUM values
func ValidateIntENUM(enum ...int) func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
var diags diag.Diagnostics
switch {
case containsInt(input.(int), enum):
return diags
default:
return diag.Errorf("%d is not one of %+v", input, enum)
}
}
}
func ValidateID(numeric bool, prefixes ...string) func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
var diags diag.Diagnostics
ID := input.(string)
parts := strings.Split(ID, "-")
if len(parts) != 2 {
return diag.Errorf("\"%s\" should be of the form <prefix>-<unique>", ID)
}
switch {
case !containsString(parts[0], prefixes):
return diag.Errorf("\"%s\" should have a prefix of %v", ID, prefixes)
}
if numeric {
if !numericPattern.MatchString(parts[1]) {
return diag.Errorf("\"%s\" should have a numeric suffix", ID)
}
} else {
if !alphabetPattern.MatchString(parts[1]) {
return diag.Errorf("\"%s\" should have a alphabet suffix", ID)
}
}
return diags
}
}
func ValidatePattern(pattern *regexp.Regexp) func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
var diags diag.Diagnostics
inputString := input.(string)
if !pattern.MatchString(inputString) {
return diag.Errorf("\"%s\" does not match pattern \"%s\"", inputString, pattern.String())
}
return diags
}
}
func ValidateHostName() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
var diags diag.Diagnostics
inputString := input.(string)
if len(inputString) == 0 || len(inputString) > 255 || strings.HasSuffix(inputString, ".") {
return diag.Errorf("\"%s\" is not a valid hostname", inputString)
}
labels := strings.Split(inputString, ".")
numLabels := len(labels)
if match, _ := regexp.MatchString("\"[0-9]+$", labels[numLabels-1]); match {
return diag.Errorf("\"%s\" is not a valid hostname - the TLD must not be all-numeric", inputString)
}
for _, l := range labels {
if !hostnameLabelPattern.MatchString(l) {
return diag.Errorf("\"%s\" is not a valid hostname", inputString)
}
}
return diags
}
}
func ValidateWildcardHostName() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
inputString := input.(string)
if strings.HasPrefix(inputString, "*.") {
return ValidateHostName()(inputString[2:], nil)
}
return ValidateHostName()(inputString, nil)
}
}
// ValidateIntRange that integer value is between specified range
func ValidateIntRange(min, max int) func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
var diags diag.Diagnostics
inputInt := input.(int)
if inputInt < min {
return diag.Errorf("%d is lower than minimum value %d", inputInt, min)
}
if inputInt > max {
return diag.Errorf("%d is lower than maximum value %d", inputInt, min)
}
return diags
}
}
// ValidateStringToIntRange that integer value given as string is between specified range
func ValidateStringToIntRange(min, max int) func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) diag.Diagnostics {
var diags diag.Diagnostics
origInput := input.(string)
if origInput == "" {
return diags
}
inputInt, err := strconv.Atoi(input.(string))
if err != nil {
return diag.FromErr(err)
}
if inputInt < min {
return diag.Errorf("%d is lower than minimum value %d", inputInt, min)
}
if inputInt > max {
return diag.Errorf("%d is lower than maximum value %d", inputInt, min)
}
return diags
}
}
func ValidateHostnameOrIPV4() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
hostnameValidation := ValidateHostName()(inputString, nil)
ipv4Validation := net.ParseIP(inputString) != nil
if hostnameValidation.HasError() && !ipv4Validation {
return diag.Errorf("\"%s\" is not a valid hostname or ipv4", inputString)
}
return
}
}
func ValidateCustomUrlOrIPV4() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
if strings.HasPrefix(inputString, ".") {
return ValidateHostName()(inputString[1:], nil)
}
hostnameValidation := ValidateHostName()(inputString, nil)
ipv4Validation := net.ParseIP(inputString) != nil
if hostnameValidation.HasError() && !ipv4Validation {
return diag.Errorf("\"%s\" is not a valid hostname or ipv4", inputString)
}
return
}
}
func ValidateEmail() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
if len(inputString) > 254 {
return diag.Errorf("\"%s\" is not a valid email - cannot be longer than 254 characters", inputString)
}
_, err := mail.ParseAddress(inputString)
if err != nil {
return diag.Errorf("\"%s\" is not a valid email", inputString)
}
return
}
}
func ValidateURL() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
_, err := url.ParseRequestURI(inputString)
if err != nil {
return diag.Errorf("\"%s\" is not a valid url %s", inputString, err)
}
return
}
}
func ValidateHTTPNetLocation() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
h, err := url.ParseRequestURI(inputString)
if err != nil {
return diag.Errorf(
"\"%s\" is not a valid host: %s", inputString, err)
}
if h.Scheme != "http" && h.Scheme != "https" {
return diag.Errorf(
"\"%s\" is not a valid host: should have http or https schema only, got \"%s\"",
inputString, h.Scheme)
}
if h.Path != "" {
return diag.Errorf(
"\"%s\" is not a valid host: path is not allowed - got \"%s\"",
inputString, h.Path)
}
if h.RawQuery != "" {
return diag.Errorf(
"\"%s\" is not a valid host: query params are not allowed - got \"%s\"",
inputString, h.RawQuery)
}
if h.RawFragment != "" {
return diag.Errorf(
"\"%s\" is not a valid host: fragment is not allowed - got \"%s\"",
inputString, h.RawFragment)
}
return
}
}
func ValidateJson() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, _ cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
var js json.RawMessage
err := json.Unmarshal([]byte(inputString), &js)
if err != nil {
return diag.Errorf("\"%.200s\" is not a valid json. %s", inputString, err)
}
return
}
}
// ComposeOrValidations will take a list of validation functions and will allow the validated attribute
// if at least one function has approved the attribute
func ComposeOrValidations(fs ...func(interface{}, cty.Path) diag.Diagnostics) func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, p cty.Path) (diags diag.Diagnostics) {
for _, f := range fs {
fDiags := f(input, p)
if !fDiags.HasError() {
return diag.Diagnostics{}
}
diags = append(diags, fDiags...)
}
return
}
}
func ValidateDNS() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, path cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
if strings.Contains(inputString, "_") || !strings.Contains(inputString, ".") {
return diag.Errorf("\"%s\" is not a valid domain name", inputString)
}
if ValidateHostName()(inputString, path).HasError() {
return diag.Errorf("\"%s\" is not a valid domain name", inputString)
}
return
}
}
func ValidateDomainName() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, path cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
if inputString == "" {
return
}
if ValidateHostName()(inputString, path).HasError() {
return diag.Errorf("\"%s\" is not a valid domain name", inputString)
}
return
}
}
func ValidateCIDR4() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, path cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
ipv4addr, ipv4Net, err := net.ParseCIDR(inputString)
if err != nil {
return diag.FromErr(err)
}
if len(ipv4Net.Mask) != net.IPv4len || !ipv4addr.Equal(ipv4Net.IP) {
return diag.Errorf("\"%s\" is not a valid IPV4-CIDR", inputString)
}
return
}
}
func ValidatePEMCert() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, path cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
block, _ := pem.Decode([]byte(inputString))
if block == nil || block.Type != "CERTIFICATE" {
return diag.Errorf("failed to decode PEM block containing certificate")
}
_, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return diag.FromErr(err)
}
return
}
}
func ValidateIsoTimeFormat() func(interface{}, cty.Path) diag.Diagnostics {
return func(input interface{}, path cty.Path) (diags diag.Diagnostics) {
inputString := input.(string)
_, err := time.Parse(time.RFC3339, inputString)
if err != nil {
return diag.FromErr(err)
}
return
}
}