104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
package payCenter
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import (
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"context"
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"errors"
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"fmt"
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"math/big"
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"strconv"
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"strings"
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"videoweb/pub/common/log"
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)
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// FenToYuan 用整数拆分分/元，避免浮点运算改变下单金额及签名原文。
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func FenToYuan(price int64) string {
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amount := big.NewInt(price)
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negative := amount.Sign() < 0
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amount.Abs(amount)
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yuan := new(big.Int)
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fen := new(big.Int)
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yuan.QuoRem(amount, big.NewInt(100), fen)
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result := yuan.String()
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if fen.Sign() != 0 {
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result += fmt.Sprintf(".%02d", fen.Int64())
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}
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if negative {
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return "-" + result
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}
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return result
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}
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func YuanToFen(ctx context.Context, money string) int64 {
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result, err := ParseYuanToFen(money)
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if err != nil {
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log.Error("【新支付中心金额转换】元转分失败", log.E(err))
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}
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return result
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}
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// ParseYuanToFen 只接受十进制金额和最多两位小数，拒绝指数、内嵌符号和溢出。
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func ParseYuanToFen(money string) (int64, error) {
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money = strings.TrimSpace(money)
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if money == "" {
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return 0, errors.New("money is empty")
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}
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negative := strings.HasPrefix(money, "-")
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if negative {
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money = money[1:]
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if money == "" {
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return 0, errors.New("money is empty")
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}
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}
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parts := strings.Split(money, ".")
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if len(parts) > 2 {
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return 0, fmt.Errorf("invalid money format %q", money)
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}
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if strings.ReplaceAll(money, ".", "") == "" {
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return 0, errors.New("money has no digits")
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}
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for _, part := range parts {
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for _, digit := range part {
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if digit < '0' || digit > '9' {
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return 0, errors.New("money must contain only decimal digits")
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}
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}
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}
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if parts[0] == "" {
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parts[0] = "0"
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}
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yuan, ok := new(big.Int).SetString(parts[0], 10)
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if !ok {
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return 0, fmt.Errorf("invalid yuan amount %q", money)
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}
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decimalPart := "00"
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if len(parts) == 2 {
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decimalPart = parts[1]
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if len(decimalPart) > 2 {
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return 0, fmt.Errorf("money has more than two decimal places: %q", money)
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}
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if len(decimalPart) == 0 {
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decimalPart = "00"
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} else if len(decimalPart) == 1 {
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decimalPart += "0"
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}
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}
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cents, err := strconv.ParseInt(decimalPart, 10, 64)
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if err != nil {
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return 0, fmt.Errorf("invalid fen amount %q: %w", money, err)
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}
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total := new(big.Int).Mul(yuan, big.NewInt(100))
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total.Add(total, big.NewInt(cents))
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if negative {
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total.Neg(total)
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}
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if !total.IsInt64() {
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return 0, fmt.Errorf("money overflows int64 fen: %q", money)
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}
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return total.Int64(), nil
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}
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