增加气站合同附件受控上传与预览

backend/api/internal/logic/gas/gasorder.go

@@ -73,6 +73,33 @@ func GetGasorderContract(ctx *gin.Context) {
 	}
 }
 
+// UploadGasorderContractAttachment 为当前气站账号提供受控 PDF 临时上传。
+func UploadGasorderContractAttachment(ctx *gin.Context) {
+	if _, ok := currentGas(ctx); !ok {
+		return
+	}
+	platformgasorder.UploadGasorderContractAttachment(ctx)
+}
+
+// CleanupGasorderContractAttachment 清理当前气站账号尚未绑定的临时附件。
+func CleanupGasorderContractAttachment(ctx *gin.Context) {
+	if _, ok := currentGas(ctx); !ok {
+		return
+	}
+	platformgasorder.CleanupGasorderContractAttachment(ctx)
+}
+
+// ServeGasorderContractAttachment 仅预览当前气站合同范围内的正式附件。
+func ServeGasorderContractAttachment(ctx *gin.Context) {
+	station, ok := currentGas(ctx)
+	if !ok {
+		return
+	}
+	if _, ok := scopedContract(ctx, ctx.Param("identity"), station.ID); ok {
+		platformgasorder.ServeGasorderContractAttachment(ctx)
+	}
+}
+
 func CreateGasorderContract(ctx *gin.Context) {
 	station, ok := currentGas(ctx)
 	if !ok {