refactor: 提取公共分页解析函数 parsePageAndSize

- 新增 internal/api/handler/common.go 存放 handler 层公共辅助函数
- parsePageAndSize: 统一提取 page/page_size 参数解析、默认值设置、ClampPageSize 调用
- device/log/webhook handler: 替换重复的分页解析代码为 parsePageAndSize 调用
- 清理不再需要的 strconv/pagination 导入

internal/api/handler/common.go

@@ -0,0 +1,21 @@
+package handler
+
+import (
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/user-management-system/internal/pagination"
+)
+
+// parsePageAndSize extracts and validates page & page_size from query parameters.
+// Returns page (>=1) and pageSize (clamped to [1, MaxPageSize]).
+func parsePageAndSize(c *gin.Context) (page, pageSize int) {
+	page, _ = strconv.Atoi(c.DefaultQuery("page", "1"))
+	if page < 1 {
+		page = 1
+	}
+	pageSize, _ = strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
+	pageSize = pagination.ClampPageSize(pageSize)
+	return
+}

internal/api/handler/device_handler.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/user-management-system/internal/api/middleware"
 	"github.com/user-management-system/internal/domain"
-	"github.com/user-management-system/internal/pagination"
 	"github.com/user-management-system/internal/service"
 )
 
@@ -88,12 +87,7 @@ func (h *DeviceHandler) GetMyDevices(c *gin.Context) {
 		return
 	}
 
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	if page < 1 {
-		page = 1
-	}
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
-	pageSize = pagination.ClampPageSize(pageSize)
+	page, pageSize := parsePageAndSize(c)
 
 	devices, total, err := h.deviceService.GetUserDevices(c.Request.Context(), userID, page, pageSize)
 	if err != nil {
@@ -317,12 +311,7 @@ func (h *DeviceHandler) GetUserDevices(c *gin.Context) {
 		return
 	}
 
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	if page < 1 {
-		page = 1
-	}
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
-	pageSize = pagination.ClampPageSize(pageSize)
+	page, pageSize := parsePageAndSize(c)
 
 	devices, total, err := h.deviceService.GetUserDevices(c.Request.Context(), userID, page, pageSize)
 	if err != nil {

internal/api/handler/log_handler.go

@@ -3,11 +3,9 @@ package handler
 import (
 	"fmt"
 	"net/http"
-	"strconv"
 
 	"github.com/gin-gonic/gin"
 
-	"github.com/user-management-system/internal/pagination"
 	"github.com/user-management-system/internal/service"
 )
 
@@ -43,12 +41,7 @@ func (h *LogHandler) GetMyLoginLogs(c *gin.Context) {
 		return
 	}
 
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	if page < 1 {
-		page = 1
-	}
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
-	pageSize = pagination.ClampPageSize(pageSize)
+	page, pageSize := parsePageAndSize(c)
 
 	logs, total, err := h.loginLogService.GetMyLoginLogs(c.Request.Context(), userID, page, pageSize)
 	if err != nil {
@@ -86,12 +79,7 @@ func (h *LogHandler) GetMyOperationLogs(c *gin.Context) {
 		return
 	}
 
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	if page < 1 {
-		page = 1
-	}
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
-	pageSize = pagination.ClampPageSize(pageSize)
+	page, pageSize := parsePageAndSize(c)
 
 	logs, total, err := h.operationLogService.GetMyOperationLogs(c.Request.Context(), userID, page, pageSize)
 	if err != nil {

internal/api/handler/webhook_handler.go

@@ -66,12 +66,7 @@ func (h *WebhookHandler) CreateWebhook(c *gin.Context) {
 // @Failure 500 {object} Response "服务器错误"
 // @Router /api/v1/webhooks [get]
 func (h *WebhookHandler) ListWebhooks(c *gin.Context) {
-	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	if page < 1 {
-		page = 1
-	}
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
-	pageSize = pagination.ClampPageSize(pageSize)
+	page, pageSize := parsePageAndSize(c)
 	offset := (page - 1) * pageSize
 
 	userID, _ := c.Get("user_id")
@@ -178,9 +173,7 @@ func (h *WebhookHandler) GetWebhookDeliveries(c *gin.Context) {
 	}
 
 	limit, _ := strconv.Atoi(c.DefaultQuery("limit", strconv.Itoa(pagination.DefaultPageSize)))
-	if limit < 1 || limit > pagination.MaxPageSize {
-		limit = pagination.DefaultPageSize
-	}
+	limit = pagination.ClampPageSize(limit)
 
 	deliveries, err := h.webhookService.GetWebhookDeliveries(c.Request.Context(), id, limit)
 	if err != nil {