Update mengyastore

mengyastore-backend-go/internal/payment/mengya.go

@@ -0,0 +1,143 @@
+package payment
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"math"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// 依次尝试：微信等常带 ¥；支付宝等到账文案多为「收款x.xx元」无货币符号。
+var mengyaNoticeAmountPatterns = []*regexp.Regexp{
+	regexp.MustCompile(`到账[¥￥]\s*([\d]+(?:\.[\d]+)?)`),
+	regexp.MustCompile(`到账\s*([\d]+(?:\.[\d]+)?)\s*元`),
+	regexp.MustCompile(`收款[¥￥]\s*([\d]+(?:\.[\d]+)?)(?:\s*元)?`),
+	regexp.MustCompile(`收款\s*([\d]+(?:\.[\d]+)?)\s*元`),
+}
+
+// AmountEpsilon：Webhook 到账金额与订单快照金额对比时的容差。
+const AmountEpsilon = 0.005
+
+func AmountAlmostEqual(expected, actual float64) bool {
+	return math.Abs(expected-actual) < AmountEpsilon
+}
+
+// ParseWebhookJSON 从转发通知体中解析支付金额：
+// 优先 body.notice，其次顶层 notice，否则在序列化后的 JSON 字符串中扫描。
+func ParseWebhookJSON(raw []byte) (float64, bool) {
+	if len(bytes.TrimSpace(raw)) == 0 {
+		return 0, false
+	}
+	var top map[string]json.RawMessage
+	if err := json.Unmarshal(raw, &top); err != nil {
+		return scanAmount(string(raw))
+	}
+	if v, ok := top["notice"]; ok {
+		if s := jsonString(v); s != "" {
+			return scanAmount(s)
+		}
+	}
+	if inner, ok := top["body"]; ok {
+		var nested map[string]json.RawMessage
+		if json.Unmarshal(inner, &nested) == nil {
+			if v, ok := nested["notice"]; ok {
+				if s := jsonString(v); s != "" {
+					return scanAmount(s)
+				}
+			}
+			if amt, ok := scanAmount(jsonString(inner)); ok {
+				return amt, ok
+			}
+			return scanAmount(string(inner))
+		}
+		if amt, ok := scanAmount(strings.Trim(strings.Trim(string(inner), "\""), `"`)); ok {
+			return amt, ok
+		}
+		return scanAmount(string(inner))
+	}
+	buf, _ := json.Marshal(top)
+	return scanAmount(string(buf))
+}
+
+func jsonString(raw json.RawMessage) string {
+	var s string
+	if json.Unmarshal(raw, &s) == nil {
+		return s
+	}
+	return ""
+}
+
+func scanAmount(text string) (float64, bool) {
+	if amt, ok := parseAmountRegex(text); ok {
+		return amt, true
+	}
+	return parseAmountRegex(strings.ReplaceAll(text, `\n`, "\n"))
+}
+
+func parseAmountRegex(text string) (float64, bool) {
+	for _, re := range mengyaNoticeAmountPatterns {
+		match := re.FindStringSubmatch(text)
+		if len(match) < 2 {
+			continue
+		}
+		s := strings.ReplaceAll(match[1], ",", "")
+		yuan, err := strconv.ParseFloat(s, 64)
+		if err != nil {
+			continue
+		}
+		return yuan, true
+	}
+	return 0, false
+}
+
+// NoticeFieldsForLog 从常见萌芽/转发 JSON 里抽出 notice 等字段，仅供后台日志排查（如微信/支付宝文案差异）。
+func NoticeFieldsForLog(raw []byte) string {
+	if len(bytes.TrimSpace(raw)) == 0 {
+		return ""
+	}
+	var top map[string]json.RawMessage
+	if err := json.Unmarshal(raw, &top); err != nil {
+		return ""
+	}
+	var parts []string
+	add := func(k, v string) {
+		if v == "" {
+			return
+		}
+		if len(v) > 600 {
+			v = v[:600] + "…"
+		}
+		parts = append(parts, fmt.Sprintf("%s=%s", k, strconv.Quote(v)))
+	}
+	if v, ok := top["notice"]; ok {
+		add("notice", jsonString(v))
+	}
+	if inner, ok := top["body"]; ok {
+		var nested map[string]json.RawMessage
+		if json.Unmarshal(inner, &nested) == nil {
+			if v, ok := nested["notice"]; ok {
+				add("body.notice", jsonString(v))
+			}
+			if v, ok := nested["content"]; ok {
+				add("body.content", jsonString(v))
+			}
+			if v, ok := nested["text"]; ok {
+				add("body.text", jsonString(v))
+			}
+		} else if s := jsonString(inner); s != "" {
+			add("body(string)", s)
+		}
+	}
+	for _, k := range []string{"title", "msg", "message", "desc", "description"} {
+		if v, ok := top[k]; ok {
+			add(k, jsonString(v))
+		}
+	}
+	if len(parts) == 0 {
+		return ""
+	}
+	return strings.Join(parts, "; ")
+}

mengyastore-backend-go/internal/payment/types.go

@@ -0,0 +1,3 @@
+package payment
+
+const MethodMengya = "mengya"