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validators.go
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validators.go
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package actions
import (
"encoding/hex"
"github.com/shantanu-hashcash/go/services/aurora/internal/db2/history"
"strings"
"github.com/asaskevich/govalidator"
"github.com/gorilla/schema"
"github.com/shantanu-hashcash/go/amount"
"github.com/shantanu-hashcash/go/services/aurora/internal/assets"
"github.com/shantanu-hashcash/go/support/errors"
"github.com/shantanu-hashcash/go/xdr"
)
// Validateable allow structs to define their own custom validations.
type Validateable interface {
Validate() error
}
func init() {
govalidator.TagMap["accountID"] = isAccountID
govalidator.TagMap["amount"] = isAmount
govalidator.TagMap["assetType"] = isAssetType
govalidator.TagMap["asset"] = isAsset
govalidator.TagMap["claimableBalanceID"] = isClaimableBalanceID
govalidator.TagMap["transactionHash"] = isTransactionHash
govalidator.TagMap["sha256"] = govalidator.IsSHA256
govalidator.TagMap["tradeType"] = isTradeType
}
var customTagsErrorMessages = map[string]string{
"accountID": "Account ID must start with `G` and contain 56 alphanum characters",
"amount": "Amount must be positive",
"asset": "Asset must be the string \"native\" or a string of the form \"Code:IssuerAccountID\" for issued assets.",
"assetType": "Asset type must be native, credit_alphanum4 or credit_alphanum12",
"bool": "Filter should be true or false",
"claimable_balance_id": "Claimable Balance ID must be the hex-encoded XDR representation of a Claimable Balance ID",
"ledger_id": "Ledger ID must be an integer higher than 0",
"offer_id": "Offer ID must be an integer higher than 0",
"op_id": "Operation ID must be an integer higher than 0",
"transactionHash": "Transaction hash must be a hex-encoded, lowercase SHA-256 hash",
"tradeType": "Trade type must be all, orderbook, or liquidity_pool",
}
func isTradeType(tradeType string) bool {
return tradeType == history.AllTrades ||
tradeType == history.OrderbookTrades ||
tradeType == history.LiquidityPoolTrades
}
// isAsset validates if string contains a valid SEP11 asset
func isAsset(assetString string) bool {
var asset xdr.Asset
if strings.ToLower(assetString) == "native" {
if err := asset.SetNative(); err != nil {
return false
}
} else {
parts := strings.Split(assetString, ":")
if len(parts) != 2 {
return false
}
code := parts[0]
if !xdr.ValidAssetCode.MatchString(code) {
return false
}
issuer, err := xdr.AddressToAccountId(parts[1])
if err != nil {
return false
}
if err := asset.SetCredit(code, issuer); err != nil {
return false
}
}
return true
}
func getSchemaErrorFieldMessage(field string, err error) error {
if customMessage, ok := customTagsErrorMessages[field]; ok {
return errors.New(customMessage)
}
if ce, ok := err.(schema.ConversionError); ok {
customMessage, ok := customTagsErrorMessages[ce.Type.String()]
if ok {
return errors.New(customMessage)
}
}
return err
}
func getErrorFieldMessage(err error) (string, string) {
var field, message string
switch err := err.(type) {
case govalidator.Error:
field = err.Name
validator := err.Validator
m, ok := customTagsErrorMessages[validator]
// Give priority to inline custom error messages.
// CustomErrorMessageExists when the validator is defined like:
// `validatorName~custom message`
if !ok || err.CustomErrorMessageExists {
m = err.Err.Error()
}
message = m
case govalidator.Errors:
for _, item := range err.Errors() {
field, message = getErrorFieldMessage(item)
break
}
}
return field, message
}
func isAssetType(str string) bool {
if _, err := assets.Parse(str); err != nil {
return false
}
return true
}
func isAccountID(str string) bool {
if _, err := xdr.AddressToAccountId(str); err != nil {
return false
}
return true
}
func isTransactionHash(str string) bool {
decoded, err := hex.DecodeString(str)
if err != nil {
return false
}
return len(decoded) == 32 && strings.ToLower(str) == str
}
func isAmount(str string) bool {
parsed, err := amount.Parse(str)
switch {
case err != nil:
return false
case parsed <= 0:
return false
}
return true
}
func isClaimableBalanceID(str string) bool {
var cbID xdr.ClaimableBalanceId
err := xdr.SafeUnmarshalHex(str, &cbID)
return err == nil
}