bj_power/bj_power_workstation/internal/handler/proxy.go

package handler

import (
	"io"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"

	"bj_power_workstation/internal/mes"
	"bj_power_workstation/internal/pdfcache"
	"bj_power_workstation/internal/svc"
)

// taskCurrentHandler 代理 MES GET /api/internal/station/task?stationNo=。
// 响应体原样透传（MES 已按 {code,message,data} 封装，不再二次包装）。
func taskCurrentHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		stationNo := atoi(strings.TrimSpace(r.URL.Query().Get("stationNo")), 0)
		if stationNo <= 0 {
			fail(w, http.StatusBadRequest, "缺少 stationNo 参数")
			return
		}

		body, _, err := ctx.Mes.Get("/api/internal/station/task", url.Values{"stationNo": {strconv.Itoa(stationNo)}})
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write(body)
	}
}

// workloadHandler 代理 MES GET /api/internal/station/workload?operator=&from=&to=（块6）。
// 工位终端「我的工作量」仅查询当前登录人数据；MES 响应体原样透传。
func workloadHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		operator := strings.TrimSpace(r.URL.Query().Get("operator"))
		from := strings.TrimSpace(r.URL.Query().Get("from"))
		to := strings.TrimSpace(r.URL.Query().Get("to"))
		params := url.Values{}
		if operator != "" {
			params.Set("operator", operator)
		}
		if from != "" {
			params.Set("from", from)
		}
		if to != "" {
			params.Set("to", to)
		}
		body, _, err := ctx.Mes.Get("/api/internal/station/workload", params)
		if err != nil {
			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
			return
		}
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write(body)
	}
}

// ---------- 工艺 PDF 直通代理（含本地预缓存） ----------
//
// 前端 iframe/window.open 无法携带 Authorization，故提供免 JWT 前缀 /pdfopen/<name>，
// 内部仍走 MES /api/internal/files/<name>（由 X-API-TOKEN 保护）。
// 启用本地预缓存后，首次访问回源下载并落盘，后续直接读本地缓存（断网也能查看）。
// 两端点均把文件流原样转发并透传 Content-Type，不套 {code,message,data}。

// pdfQueryHandler GET /api/pdf?name=<file>（需登录）
func pdfQueryHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		forwardFile(w, ctx.Mes, ctx.PdfCache, strings.TrimSpace(r.URL.Query().Get("name")))
	}
}

// pdfOpenHandler GET /pdfopen/<name>（免鉴权，供 iframe 直链）
func pdfOpenHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		raw := strings.TrimPrefix(r.URL.EscapedPath(), "/pdfopen/")
		name, err := url.PathUnescape(raw)
		if err != nil {
			fail(w, http.StatusBadRequest, "非法文件名")
			return
		}
		forwardFile(w, ctx.Mes, ctx.PdfCache, name)
	}
}

// forwardFile 校验单段文件名后拉取 MES 文件流并原样转发；优先命中本地预缓存。
func forwardFile(w http.ResponseWriter, mesc *mes.Client, cache *pdfcache.Cache, name string) {
	name = strings.TrimSpace(name)
	if name == "" {
		fail(w, http.StatusBadRequest, "缺少文件名")
		return
	}
	if strings.ContainsAny(name, `/\`) || name == "." || name == ".." || strings.Contains(name, "..") {
		fail(w, http.StatusBadRequest, "非法文件名")
		return
	}

	// 1) 命中本地预缓存 → 直接回源本地文件
	if p, ok := cache.Get(name); ok {
		f, err := os.Open(p)
		if err == nil {
			stream(f, w, name, "")
			return
		}
		f.Close()
	}

	// 2) 回源 MES 下载
	body, header, err := mesc.Get("/api/internal/files/"+url.PathEscape(name), nil)
	if err != nil {
		fail(w, http.StatusBadGateway, "工艺文件获取失败："+errString(err))
		return
	}

	// 3) 写入本地预缓存（失败不影响本次响应）
	_, _ = cache.Put(name, body)
	streamBytes(body, w, name, header.Get("Content-Type"))
}

func stream(f io.ReadCloser, w http.ResponseWriter, name, contentType string) {
	defer f.Close()
	ct := contentType
	if ct == "" {
		ct = "application/pdf"
	}
	w.Header().Set("Content-Type", ct)
	w.Header().Set("X-Original-Filename", strconv.Quote(name))
	w.Header().Set("X-PDF-Cache", "hit")
	w.WriteHeader(http.StatusOK)
	_, _ = io.Copy(w, f)
}

func streamBytes(body []byte, w http.ResponseWriter, name, contentType string) {
	ct := contentType
	if ct == "" {
		ct = "application/pdf"
	}
	w.Header().Set("Content-Type", ct)
	w.Header().Set("X-Original-Filename", strconv.Quote(name))
	w.Header().Set("X-PDF-Cache", "miss")
	w.WriteHeader(http.StatusOK)
	_, _ = w.Write(body)
}