<el-upload
  v-loading="loading"
  class="upload-demo"
  drag
  ref="upload"
  action="#"
  accept=".txt"
  :before-upload="onBeforeUploadImage"
  :http-request="UploadImage"
  :on-change="fileChange"
  :file-list="fileList"
 >
 <i class="el-icon-upload"></i>
 <div class="el-upload__text">
  将文件拖到此处，或
  <em>点击上传</em>
 </div>
 <div class="el-upload__tip" slot="tip">只能上传txt文件，且不超过1M</div>
</el-upload>

onBeforeUploadImage(file) {
 const isTxt = file.type === "text/plain";
 const isLt1M = file.size / 1024 / 1024 < 1;
 if (!isTxt) {
  this.$message.error("上传文件只能是txt格式!");
 }
 if (!isLt1M) {
  this.$message.error("上传文件大小不能超过 1MB!");
 }
 return isTxt && isLt1M;
}

fileChange(file) {
  let obj = this.onBeforeUploadImage(file.raw);
  if (obj) {
    this.$refs.upload.clearFiles(); 
    this.fileList = [{ name: file.name, url: file.url }];
  }
}

UploadImage(param) {
  this.loading = true;
  const formData = new FormData();
  formData.append("file", param.file);
  this.$axios({
    url: process.env.VUE_APP_BASE_API + "api/txtToMp3",
    method: "post",
    data: formData
  })
  .then(response => {
    if (response.data.code == 0) {
      this.loading = false;
      this.dialogVisible = true;
      this.url = response.data.data.url;
    }
  })
  .catch(error => {
    console.log(error);
  });
}

const formidable = require("formidable"); //获取上传的txt，并保存
const path = require("path"); 
const AipSpeech = require("baidu-aip-sdk").speech; //百度语音合成sdk
const fs = require("fs"); 
const compressing = require("compressing"); //压缩文件夹用

router.post("/txtToMp3", async function (req, res, next) {
 let form = new formidable.IncomingForm();
 form.encoding = "utf-8"; //编码
 form.uploadDir = path.join(__dirname + "/../txt"); //保存上传文件地址
 form.keepExtensions = true; //保留后缀

 form.parse(req, function (err, fields, files) {
  let filename;
  filename = files.file.name;

  let nameArray = filename.split("."); //分割
  let type = nameArray[nameArray.length - 1];
  let name = "";
  for (let i = 0; i < nameArray.length - 1; i++) {
   name = name + nameArray[i];
  }
  let date = new Date();
  let time = "_" + date.getTime();
  let avatarName = name + time + "." + type;
  let newPath = form.uploadDir + "/" + avatarName;
  fs.renameSync(files.file.path, newPath); //移动文件
  fs.readFile(newPath, "utf-8", function (err, data) {
   if (err) {
    console.log(err);
    new Result(null, "读取失败").fail(res);
   } else {
    let client = new AipSpeech(
     0,
     "百度语音合成key",
     "百度语音合成secret"
    );

    let resultData = data.split("\n");
    let number = resultData.length;
    let formTime = new Date().getTime();
    let mp3FileDir = path.join(__dirname + "/../mp3_" + formTime);
    fs.mkdirSync(mp3FileDir);
    for (let i in resultData) {
      setTimeout(function(){
        if (resultData[i].indexOf("|||") != -1) {
        let text = resultData[i].split("|||")[1];
        // 语音合成，保存到本地文件
        client.text2audio(text, { spd: 4, per: 4 }).then(
         function (result) {
          if (result.data) {
           let time = resultData[i].split("|||")[0] + "_voice";
           let avatarName_mp3 = mp3FileDir + "/" + time + ".mp3";
           fs.writeFileSync(avatarName_mp3, result.data);
           number--;
           if (number == 0) {
            let zipFileName = "zip/mp3_" + formTime + ".zip";
            compressing.zip
             .compressDir(mp3FileDir, zipFileName)
             .then(() => {
              let item = {
               url: zipFileName,
              };
              new Result(item, "压缩成功").success(res);
             })
             .catch((err) => {
              new Result(null, "压缩失败").fail(res);
             });
           }
          } else {
           // 合成服务发生错误
           new Result(null, "合成失败").fail(res);
          }
         },
         function (err) {
          console.log(err);
         }
        );
       } else {
        new Result(null, "文件格式错误").fail(res);
       }  
      },i * 20)
    }
   }
  });
 });
});