如何在 nodejs 中使用 multer-imager npm 模块并将调整大小的图像上传到亚马逊 s3 存储桶？答案

【问题标题】：How to use multer-imager npm module in nodejs and upload my image resized to amazon s3 bucket?如何在 nodejs 中使用 multer-imager npm 模块并将调整大小的图像上传到亚马逊 s3 存储桶？
【发布时间】：2018-01-01 18:34:09
【问题描述】：

/********app.js***********/

var express = require('express'),
    aws = require('aws-sdk'),
    bodyParser = require('body-parser'),
    multer = require('multer'),
    imager = require('multer-imager'),
    multerS3 = require('multer-s3');



var app = express(),


app.use(bodyParser.json());


var upload = multer({
 storage: imager({
    dirname: 'avatar',
    bucket: 'my bucket',
    accessKeyId: 'myaccesskey',
    secretAccessKey: 'secretaccesskey',
    region: 'Asia Pacific (Mumbai)',
    signatureVersion: 'v4',
    filename: function (req, file, cb) {  
              cb(null, Date.now())                
     },                                    
     gm: {                                  
      width: 200,                         
      height: 200,
      options: '!',
      format: 'png'                       
     },
    s3 : {                                
    Metadata: {                        
    'acl': 'public-read'              
   }
  }

})
});


 app.post('/upload', upload.array('upl', 1), function(req, res, next){ 
 console.log(req.files); // Print upload details
 res.send('Successfully uploaded!');
 }); 


app.get('/', function (req, res) {
    res.sendFile(__dirname + '/index.html');
});



app.listen(3001, function () {
    console.log('Example app listening on port 3001!');
});

下面是我的 index.html 文件....

 /***************index.html*********************/
    <!DOCTYPE html>
    <html>
    <head lang="en">
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
    Hey! Lets try uploading to s3 directly :)

    <form method="post" enctype="multipart/form-data" action="/upload">
        <p>
            <input type="text" name="title" placeholder="optional title"/>
        </p>

        <p>
            <input type="file" name="upl"/>
            <!-- <input type="file" name="uplo"/> -->
        </p>

        <p>
            <input type="submit"/>
        </p>
    </form>
    </body>
    </html>
    /**********************************************/

当我尝试使用上面的代码上传和调整我的图像大小时，我收到以下错误。但是当我尝试通过不调整大小直接上传我的文件时，它在 npm multer-s3 模块的帮助下成功，但我不能调整或缩小我的缩略图的大小。使用 multer s3 模块。我需要减小缩略图大小可以做什么？

错误：

UnknownEndpoint: Inaccessible host: `s3.asia'. This service may not be available in the `Asia Pacific (Mumbai)' region.
    at Request.ENOTFOUND_ERROR (/path/to/folder//node_modules/s3fs/node_modules/aws-sdk/lib/event_listeners.js:393:46)
    at Request.callListeners (/path/to/folder//node_modules/s3fs/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
    at Request.emit (/path/to/folder//node_modules/s3fs/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
    at Request.emit (/path/to/folder//node_modules/s3fs/node_modules/aws-sdk/lib/request.js:668:14)
    at ClientRequest.error (/path/to/folder//node_modules/s3fs/node_modules/aws-sdk/lib/event_listeners.js:232:22)
    at ClientRequest.<anonymous> (/path/to/folder//node_modules/s3fs/node_modules/aws-sdk/lib/http/node.js:62:19)
    at emitOne (events.js:115:13)
    at ClientRequest.emit (events.js:210:7)
    at TLSSocket.socketErrorListener (_http_client.js:399:9)
    at emitOne (events.js:115:13)
    at TLSSocket.emit (events.js:210:7)
    at emitErrorNT (internal/streams/destroy.js:62:8)
    at _combinedTickCallback (internal/process/next_tick.js:102:11)
    at process._tickDomainCallback (internal/process/next_tick.js:198:9)

如何解决这个问题？有什么方法可以让我所在的地区使用这个功能吗？

【问题讨论】：

标签： node.js npm multer multer-s3

【解决方案1】：

您是否尝试过以其他格式添加区域？我的 S3 配置如下所示：

S3_REGION=eu-central-1
S3_DOMAIN=https://s3.eu-central-1.amazonaws.com/

（我正在使用 aws-sdk 模块）

【讨论】：

region: 'Asia Pacific (Mumbai)' This is my region 如何以这种格式给出？
docs.aws.amazon.com/general/latest/gr/rande.html -> 看起来像：ap-south-1
我已经替换了你所说的区域，但现在上传图片时上传了一个零字节的空文件..