代码之家 › 专栏 › 技术社区 › Jee Mok ecanf

环回-使用远程方法下载PDF

loopback strongloop loopbackjs pdf node.js

Jee Mok ecanf · 技术社区 · 8 年前

我想使用远程方法从第三方API下载一个PDF文件,我的实现是:

staff.statement=async(id,year,month)=>。{
const filedata=等待thirdpartyapi.restget(id,year,month);
const filename=`statement month$year.pdf`;
返回[filedata,'application/pdf',`inline;filename=$文件名`];
};

staff.remotemethod('语句',){
接受:[
arg:'id',type:'any',required:true,
arg:'year',type:'string',required:true,
arg:'month',type:'string',required:true
,
description:'下载语句文件',
http:路径:“/:id/statement”,动词:“get”,
返回:[
arg:'body',type:'file',root:true,
arg:'content type',type:'string',http:target:'header',
arg:'content disposition',type:'string',http:target:'header'
(});
问题是该文件获得正确的查看/下载(如果我设置了content disposition:attachment;filename=$filename.),但它是一个空白的pdf:。




我检查了招摇机的响应数据,数据与直接从第三方API获得的数据相同:



这是响应头:

。{
“strict transport security”:“max age=0;includeSubDomains”,
“内容编码”:“”,
“x-content-type-options”:“nosniff”,
“日期”:“周一,2018年7月16日04:50:36 GMT”,
“x-download-options”:“noopen”,
“x-frame-options”:“sameorigin”,
“content type”:“应用程序/pdf”,
“传输编码”:“分块”,
“content disposition”:“inline;filename=statement_.pdf”,
“connection”:“保持活动”,
“访问控制允许凭据”:“真”,
“vary”:“来源”,
“x-xss-protection”:“1;模式=块”
}
显示器或数据有什么问题?


更新:my implementation after the help of mohammad raheem



staff.statement=(id,year,month,res,cb)=>。{
常量选项={
网址:/请求,
标题:{
授权:/代币
}
};

请求(选项)
.on(“错误”,err=>cb(err))
.on('response',response=>cb(空,response,'application/pdf'))
.管道(Res);

//使用“请求承诺”包:
//请求(选项)
//.then(response=>cb(空,response,'application/pdf'))
//.catch(err=>cb(err));
};
};

staff.remotemethod('语句',){
接受:[

Content-Disposition: attachment;filename=${filename}









{
  "strict-transport-security": "max-age=0; includeSubDomains",
  "content-encoding": "",
  "x-content-type-options": "nosniff",
  "date": "Mon, 16 Jul 2018 04:50:36 GMT",
  "x-download-options": "noopen",
  "x-frame-options": "SAMEORIGIN",
  "content-type": "application/pdf",
  "transfer-encoding": "chunked",
  "content-disposition": "inline;filename=Statement_062016.pdf",
  "connection": "keep-alive",
  "access-control-allow-credentials": "true",
  "vary": "Origin",
  "x-xss-protection": "1; mode=block"
}








Staff.statement = (id, year, month, res, cb) => {
    const options = {
      url: // {{request_url}},
      headers: {
        authorization: // {{token}}
      }
    }; 

    request(options)
      .on('error', err => cb(err))
      .on('response', response => cb(null, response, 'application/pdf'))
      .pipe(res);

    // using 'request-promise' package:
    // request(options)
    //   .then(response => cb(null, response, 'application/pdf'))
    //   .catch(err => cb(err));
  };
};

Staff.remoteMethod('statement ', {
  accepts: [
    { arg: 'id', type: 'any', required: true },
    { arg: 'year', type: 'string', required: true },
    { arg: 'month', type: 'string', required: true },
    { arg: 'res', type: 'object', http: { source: 'res' } }
  ],
  description: 'Download statement file',
  http: { path: '/:id/statement', verb: 'GET' },
  returns: [
    { arg: 'body', type: 'file', root: true },
    { arg: 'Content-Type', type: 'string', http: { target: 'header' } }
});

1 回复 | 直到 8 年前

Mohammad Raheem 8 年前

    var request = require('request');
    var fs = require("fs");

var _downloadPdf = function (url,callback) {
    var url = 'your-url';
    var options = {
        method: 'GET',
        url: url,
        headers: {
            'Content-Type': 'application/pdf',
        }
    };
    var _filepath = 'D://Node/upload/temp/sample.pdf';
    //If you want to go with pipe in case of chunk data
    var dest = fs.createWriteStream(filepath);
    request(options, function (error, response, body) {
        if (error)
            throw new Error(error);

    }).on('end', function () {
        return callback(filepath);
    }).on('error', function (err) {
        return callback(err);
    }).pipe(dest);
}