Express Connect busboy-亚马逊S3-验证和返回
我正在尝试使用connect busboy将文件从浏览器直接上传到Amazon S3，代码如下（） 路由-index.js： var awsUpload=require（“../services/aws streaming”） 我想做的是验证mimetype并返回一个带有错误消息的json数组，结束对表单的解析，而不是上载文件。已将代码添加到aws流媒体，但即使验证为true，它也不会返回。我做错了什么 此外，代码在完成表单解析后运行回调，但我希望在实际上载文件时运行回调。如何实现这一点，注释掉'finish'事件中的下一个（）并将其移动到Knox.aws.putBuffer 我正在使用express4Express Connect busboy-亚马逊S3-验证和返回,express,amazon-s3,busboy,Express,Amazon S3,Busboy,我正在尝试使用connect busboy将文件从浏览器直接上传到Amazon S3，代码如下（） 路由-index.js： var awsUpload=require（“../services/aws streaming”） 我想做的是验证mimetype并返回一个带有错误消息的json数组，结束对表单的解析，而不是上载文件。已将代码添加到aws流媒体，但即使验证为true，它也不会返回。我做错了什么 此外，代码在完成表单解析后运行回调，但我希望在实际上载文件时运行回调。如何实现这一点，注释掉
if（mimetype！=“text/plain”）{console.log（'true！'）；file.resume（）；return res.status（400）.json（{status:'error mime}）；//一个json数组出现错误“error file type”！}// Index route
// ===========
exports.index = function(req, res){
if (req.method === 'POST') {
return awsUpload(req, function(err, url) {
res.send(JSON.stringify(url));
});
}
res.writeHead(200, { Connection: 'close' });
res.end('<html><head></head><body>\
<form method="POST" enctype="multipart/form-data">\
<input type="file" name="filefield"><br />\
<input type="submit">\
</form>\
</body></html>');
};
// Initialize aws client
// =====================
var config = require('../config/' + 'development');
var Knox = require('knox');
var moment = require('moment');
var crypto = require('crypto');
// Create the knox client with your aws settings
Knox.aws = Knox.createClient({
key: config.aws.AWS_ACCESS_KEY_ID,
secret: config.aws.AWS_SECRET_ACCESS_KEY,
bucket: config.aws.S3_BUCKET_NAME,
region: 'eu-west-1'
});
// S3 upload service - stream buffers to S3
// ========================================
var s3UploadService = function(req, next) {
req.files = {};
req.busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
if (!filename) {
// If filename is not truthy it means there's no file
return;
}
//////////////// CHECK FOR MIMETYE /////////////////////
// If file is not "text/plain" - return //
if (mimetype != "text/plain") {
console.log('true!')
return; // A JSON array with an error "Wrong file type"!
}
// Create the initial array containing the stream's chunks
file.fileRead = [];
file.on('data', function(chunk) {
// Push chunks into the fileRead array
this.fileRead.push(chunk);
});
file.on('error', function(err) {
console.log('Error while buffering the stream: ', err);
});
file.on('end', function() {
// Concat the chunks into a Buffer
var finalBuffer = Buffer.concat(this.fileRead);
req.files[fieldname] = {
buffer: finalBuffer,
size: finalBuffer.length,
filename: filename,
mimetype: mimetype
};
// Generate date based folder prefix
var datePrefix = moment().format('YYYY[/]MM');
var key = crypto.randomBytes(10).toString('hex');
var hashFilename = key + '-' + filename;
var pathToArtwork = '/artworks/' + datePrefix + '/' + hashFilename;
var headers = {
'Content-Length': req.files[fieldname].size,
'Content-Type': req.files[fieldname].mimetype,
'x-amz-acl': 'public-read'
};
Knox.aws.putBuffer( req.files[fieldname].buffer, pathToArtwork, headers, function(err, response){
if (err) {
console.error('error streaming image: ', new Date(), err);
return next(err);
}
if (response.statusCode !== 200) {
console.error('error streaming image: ', new Date(), err);
return next(err);
}
console.log('Amazon response statusCode: ', response.statusCode);
console.log('Your file was uploaded');
next();
});
});
});
req.busboy.on('error', function(err) {
console.error('Error while parsing the form: ', err);
next(err);
});
req.busboy.on('finish', function() {
console.log('Done parsing the form!');
// When everythin's done, render the view
next(null, 'http://www.google.com');
});
// Start the parsing
req.pipe(req.busboy);
};
module.exports = s3UploadService;