init: web_hgdjc_server

2026-11-07 10:44:09 +08:00
commit 71a4f4e175
713 changed files with 147749 additions and 0 deletions
@@ -0,0 +1,103 @@
+package payCenter
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"math/big"
+	"strconv"
+	"strings"
+
+	"videoweb/pub/common/log"
+)
+
+// 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。
+func FenToYuan(price int64) string {
+	amount := big.NewInt(price)
+	negative := amount.Sign() < 0
+	amount.Abs(amount)
+	yuan := new(big.Int)
+	fen := new(big.Int)
+	yuan.QuoRem(amount, big.NewInt(100), fen)
+	result := yuan.String()
+	if fen.Sign() != 0 {
+		result += fmt.Sprintf(".%02d", fen.Int64())
+	}
+	if negative {
+		return "-" + result
+	}
+	return result
+}
+
+func YuanToFen(ctx context.Context, money string) int64 {
+	result, err := ParseYuanToFen(money)
+	if err != nil {
+		log.Error("【新支付中心金额转换】元转分失败", log.E(err))
+	}
+	return result
+}
+
+// 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。
+func ParseYuanToFen(money string) (int64, error) {
+	money = strings.TrimSpace(money)
+	if money == "" {
+		return 0, errors.New("money is empty")
+	}
+
+	negative := strings.HasPrefix(money, "-")
+	if negative {
+		money = money[1:]
+		if money == "" {
+			return 0, errors.New("money is empty")
+		}
+	}
+	parts := strings.Split(money, ".")
+	if len(parts) > 2 {
+		return 0, fmt.Errorf("invalid money format %q", money)
+	}
+	if strings.ReplaceAll(money, ".", "") == "" {
+		return 0, errors.New("money has no digits")
+	}
+	for _, part := range parts {
+		for _, digit := range part {
+			if digit < '0' || digit > '9' {
+				return 0, errors.New("money must contain only decimal digits")
+			}
+		}
+	}
+	if parts[0] == "" {
+		parts[0] = "0"
+	}
+
+	yuan, ok := new(big.Int).SetString(parts[0], 10)
+	if !ok {
+		return 0, fmt.Errorf("invalid yuan amount %q", money)
+	}
+
+	decimalPart := "00"
+	if len(parts) == 2 {
+		decimalPart = parts[1]
+		if len(decimalPart) > 2 {
+			return 0, fmt.Errorf("money has more than two decimal places: %q", money)
+		}
+		if len(decimalPart) == 0 {
+			decimalPart = "00"
+		} else if len(decimalPart) == 1 {
+			decimalPart += "0"
+		}
+	}
+	cents, err := strconv.ParseInt(decimalPart, 10, 64)
+	if err != nil {
+		return 0, fmt.Errorf("invalid fen amount %q: %w", money, err)
+	}
+
+	total := new(big.Int).Mul(yuan, big.NewInt(100))
+	total.Add(total, big.NewInt(cents))
+	if negative {
+		total.Neg(total)
+	}
+	if !total.IsInt64() {
+		return 0, fmt.Errorf("money overflows int64 fen: %q", money)
+	}
+	return total.Int64(), nil
+}