Javascript 文件名未用作AWS S3名称
我正在使用expressjs,并试图将一个可以在我的应用程序中使用的图像发布到AWS S3。我一直在关注这一点,虽然我能够成功上传图像,但每次提供的文件名都是Javascript 文件名未用作AWS S3名称,javascript,node.js,amazon-web-services,express,Javascript,Node.js,Amazon Web Services,Express,我正在使用expressjs,并试图将一个可以在我的应用程序中使用的图像发布到AWS S3。我一直在关注这一点,虽然我能够成功上传图像,但每次提供的文件名都是default\u name,我不相信字符串中附加了文件格式来提供正确的图像格式。当我查看教程中提供的s3upload.js脚本时,我注意到default\u name是它们为文件提供的标准名称,但我不确定它为什么不使用标题就接受我的文件 events-create.ejs(我可以在这里上传): s3upload.js: (function
default\u name
,我不相信字符串中附加了文件格式来提供正确的图像格式。当我查看教程中提供的s3upload.js
脚本时,我注意到default\u name
是它们为文件提供的标准名称,但我不确定它为什么不使用标题就接受我的文件
events-create.ejs(我可以在这里上传):
s3upload.js:
(function() {
window.S3Upload = (function() {
S3Upload.prototype.s3_object_name = 'default_name';
S3Upload.prototype.s3_sign_put_url = '/signS3put';
S3Upload.prototype.file_dom_selector = 'file_upload';
S3Upload.prototype.onFinishS3Put = function(public_url) {
return console.log('base.onFinishS3Put()', public_url);
};
S3Upload.prototype.onProgress = function(percent, status) {
return console.log('base.onProgress()', percent, status);
};
S3Upload.prototype.onError = function(status) {
return console.log('base.onError()', status);
};
function S3Upload(options) {
if (options == null) options = {};
for (option in options) {
this[option] = options[option];
}
this.handleFileSelect(document.getElementById(this.file_dom_selector));
}
S3Upload.prototype.handleFileSelect = function(file_element) {
var f, files, output, _i, _len, _results;
this.onProgress(0, 'Upload started.');
files = file_element.files;
output = [];
_results = [];
for (_i = 0, _len = files.length; _i < _len; _i++) {
f = files[_i];
_results.push(this.uploadFile(f));
}
return _results;
};
S3Upload.prototype.createCORSRequest = function(method, url) {
var xhr;
xhr = new XMLHttpRequest();
if (xhr.withCredentials != null) {
xhr.open(method, url, true);
} else if (typeof XDomainRequest !== "undefined") {
xhr = new XDomainRequest();
xhr.open(method, url);
} else {
xhr = null;
}
return xhr;
};
S3Upload.prototype.executeOnSignedUrl = function(file, callback) {
var this_s3upload, xhr;
this_s3upload = this;
xhr = new XMLHttpRequest();
xhr.open('GET', this.s3_sign_put_url + '?s3_object_type=' + file.type + '&s3_object_name=' + this.s3_object_name, true);
xhr.overrideMimeType('text/plain; charset=x-user-defined');
xhr.onreadystatechange = function(e) {
var result;
if (this.readyState === 4 && this.status === 200) {
try {
result = JSON.parse(this.responseText);
} catch (error) {
this_s3upload.onError('Signing server returned some ugly/empty JSON: "' + this.responseText + '"');
return false;
}
return callback(result.signed_request, result.url);
} else if (this.readyState === 4 && this.status !== 200) {
return this_s3upload.onError('Could not contact request signing server. Status = ' + this.status);
}
};
return xhr.send();
};
S3Upload.prototype.uploadToS3 = function(file, url, public_url) {
var this_s3upload, xhr;
this_s3upload = this;
xhr = this.createCORSRequest('PUT', url);
if (!xhr) {
this.onError('CORS not supported');
} else {
xhr.onload = function() {
if (xhr.status === 200) {
this_s3upload.onProgress(100, 'Upload completed.');
return this_s3upload.onFinishS3Put(public_url);
} else {
return this_s3upload.onError('Upload error: ' + xhr.status);
}
};
xhr.onerror = function() {
return this_s3upload.onError('XHR error.');
};
xhr.upload.onprogress = function(e) {
var percentLoaded;
if (e.lengthComputable) {
percentLoaded = Math.round((e.loaded / e.total) * 100);
return this_s3upload.onProgress(percentLoaded, percentLoaded === 100 ? 'Finalizing.' : 'Uploading.');
}
};
}
xhr.setRequestHeader('Content-Type', file.type);
xhr.setRequestHeader('x-amz-acl', 'public-read');
return xhr.send(file);
};
S3Upload.prototype.uploadFile = function(file) {
var this_s3upload;
this_s3upload = this;
return this.executeOnSignedUrl(file, function(signedURL, publicURL) {
return this_s3upload.uploadToS3(file, signedURL, publicURL);
});
};
return S3Upload;
})();
}).call(this);
(函数(){
window.S3Upload=(函数(){
S3Upload.prototype.s3_对象_名称='默认_名称';
S3Upload.prototype.s3_sign_put_url='/signS3put';
S3Upload.prototype.file_dom_选择器='file_upload';
S3Upload.prototype.onfinish3put=函数(公共url){
返回console.log('base.onfinish3put()',public_url);
};
S3Upload.prototype.onProgress=功能(百分比、状态){
返回console.log('base.onProgress()',百分比,状态);
};
S3Upload.prototype.onError=功能(状态){
返回console.log('base.onError()',状态);
};
功能S3上传(选项){
if(options==null)options={};
用于(选项中的选项){
此[选项]=选项[选项];
}
this.handleFileSelect(document.getElementById(this.file\u dom\u选择器));
}
S3Upload.prototype.handleFileSelect=函数(文件元素){
变量f、文件、输出、\u i、\u len、\u结果;
此.onProgress(0,'上载已开始');
files=file_element.files;
输出=[];
_结果=[];
对于(_i=0,_len=files.length;_i<_len;_i++){
f=文件[_i];
_push(这个.uploadFile(f));
}
返回结果;
};
S3Upload.prototype.createCORSRequest=函数(方法,url){
var-xhr;
xhr=newXMLHttpRequest();
if(xhr.withCredentials!=null){
open(方法、url、true);
}else if(XDomainRequest的类型!=“未定义”){
xhr=新的XDomainRequest();
open(方法,url);
}否则{
xhr=null;
}
返回xhr;
};
S3Upload.prototype.executeOnSignedUrl=函数(文件,回调){
var本次上传,xhr;
this_s3upload=this;
xhr=newXMLHttpRequest();
xhr.open('GET',this.s3_sign_put_url+'?s3_object_type='+file.type+'&s3_object_name='+this.s3_object_name,true);
xhr.overrideMimeType('text/plain;charset=x-user-defined');
xhr.onreadystatechange=函数(e){
var结果;
if(this.readyState==4&&this.status==200){
试一试{
result=JSON.parse(this.responseText);
}捕获(错误){
this_s3upload.onError('签名服务器返回了一些丑陋/空的JSON:“'+this.responseText+”);
返回false;
}
返回回调(result.signed_请求,result.url);
}else if(this.readyState==4&&this.status!==200){
返回此\u s3upload.onError('无法联系请求签名服务器。状态='+此状态);
}
};
返回xhr.send();
};
S3Upload.prototype.uploadToS3=函数(文件、url、公共url){
var本次上传,xhr;
this_s3upload=this;
xhr=this.createCORSRequest('PUT',url);
如果(!xhr){
这是验尸官(“不支持验尸官”);
}否则{
xhr.onload=函数(){
如果(xhr.status==200){
此_s3upload.onProgress(100,“上载完成”);
返回此\u s3upload.onfinish3put(公共\u url);
}否则{
返回此\u s3upload.onError('Upload error:'+xhr.status);
}
};
xhr.onerror=函数(){
返回此_s3upload.onError('XHR error');
};
xhr.upload.onprogress=函数(e){
已加载的var百分比;
if(如长度可计算){
加载百分比=数学整轮((加载/总计)*100);
返回此_s3upload.onProgress(已加载百分比,已加载百分比==100?“正在完成”。:“正在上载”);
}
};
}
setRequestHeader('Content-Type',file.Type);
setRequestHeader('x-amz-acl','public read');
返回xhr.send(文件);
};
S3Upload.prototype.uploadFile=函数(文件){
var此_s3upload;
this_s3upload=this;
返回此.executeOnSignedUrl(文件、函数(signedURL、publicURL){
返回此\u s3upload.uploadToS3(文件、签名URL、公共URL);
});
};
返回并上传;
})();
}).打电话(这个);
您可以在客户端或服务器端设置文件名
客户端:在events-create.ejs中,将此参数传递给S3Upload:
s3_object_name: $('input[type=file]').val().match(/[^\/\\]+$/)[0]
服务器端(首选方法):在routes.js中,用唯一的文件名替换
req.query.s3\u object\u name
的所有实例。您可以使用req.query.s3\u object\u type
来确定文件名末尾的扩展名。您希望在此处使用唯一的文件名,因为所有内容都存储在同一个存储桶中,AWS会自动覆盖具有相同文件名的文件。我遇到了相同的问题,我在我的节点控制器中就是这样解决的:
aws.config.update({accessKeyId: AWS_ACCESS_KEY, secretAccessKey: AWS_SECRET_KEY});
var s3 = new aws.S3();
// Set Extension
switch(req.query.s3_object_type) {
case 'image/png':
var ext = '.png';
break;
case 'image/gif':
var ext = '.gif';
break;
case 'image/jpg':
case 'image/jpeg':
var ext = '.jpg';
break;
}
// Rename File
var name = Math.floor(new Date() / 1000);
// Set S3
var s3_params = {
Bucket: S3_BUCKET,
Key: 'blog/'+name+ext,
Expires: 60,
ContentType: req.query.s3_object_type,
ACL: 'public-read'
};
// Send S3
s3.getSignedUrl('putObject', s3_params, function(err, data){
if(err){
console.log(err);
}
else{
var return_data = {
signed_request: data,
url: 'https://'+S3_BUCKET+'.s3.amazonaws.com/'+name+ext
};
res.write(JSON.stringify(return_data));
res.end();
}
});
因此,您可以看到一个非常简单的问题解决方案,只需检查扩展名并重命名文件。希望这有帮助
s3_object_name: $('input[type=file]').val().match(/[^\/\\]+$/)[0]
aws.config.update({accessKeyId: AWS_ACCESS_KEY, secretAccessKey: AWS_SECRET_KEY});
var s3 = new aws.S3();
// Set Extension
switch(req.query.s3_object_type) {
case 'image/png':
var ext = '.png';
break;
case 'image/gif':
var ext = '.gif';
break;
case 'image/jpg':
case 'image/jpeg':
var ext = '.jpg';
break;
}
// Rename File
var name = Math.floor(new Date() / 1000);
// Set S3
var s3_params = {
Bucket: S3_BUCKET,
Key: 'blog/'+name+ext,
Expires: 60,
ContentType: req.query.s3_object_type,
ACL: 'public-read'
};
// Send S3
s3.getSignedUrl('putObject', s3_params, function(err, data){
if(err){
console.log(err);
}
else{
var return_data = {
signed_request: data,
url: 'https://'+S3_BUCKET+'.s3.amazonaws.com/'+name+ext
};
res.write(JSON.stringify(return_data));
res.end();
}
});