Javascript 直接将blob上载到s3时遇到问题
我有以下代码:Javascript 直接将blob上载到s3时遇到问题,javascript,html,amazon-s3,Javascript,Html,Amazon S3,我有以下代码: var fd = new FormData(); var key = "events/" + (new Date).getTime() + '-'; fd.append('key', key); fd.append('acl', Acl); fd.append('Content-Type', "image/jpeg"); fd.append('AWSAccessKeyId', AWSAccessK
var fd = new FormData();
var key = "events/" + (new Date).getTime() + '-';
fd.append('key', key);
fd.append('acl', Acl);
fd.append('Content-Type', "image/jpeg");
fd.append('AWSAccessKeyId', AWSAccessKeyId);
fd.append('policy', Policy);
fd.append('name', "Policy13492345");
fd.append('success_action_status', "201");
fd.append('signature', Signature);
fd.append("file", blob);
fd.append("filename", fileName + ".jpg");
var xhr = new XMLHttpRequest();
xhr.upload.addEventListener("progress", uploadProgress, false);
xhr.addEventListener("load", uploadComplete, false);
xhr.addEventListener("error", uploadFailed, false);
xhr.addEventListener("abort", uploadCanceled, false);
xhr.open('POST', 'https://s3.amazonaws.com/' + Bucket + '/', true);
xhr.send(fd);
当此请求通过时,我得到以下错误:
AccessDenied
根据策略无效:策略条件失败:[“以“,$Filename”开头,“”]
我不知道我做错了什么,我生成的blob如下:
function dataURItoBlob(dataURI) {
var binary = atob(dataURI.split(',')[1]);
var array = [];
for (var i = 0; i < binary.length; i++) {
array.push(binary.charCodeAt(i));
}
var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
return new Blob([new Uint8Array(array)], { type: mimeString });
}
解决了这个问题,formdata的顺序很重要,您必须遵循正确的顺序才能正确发布数据。From-文件应该是表单中的最后一个元素。我花了一段时间才找到这份文件。这里是…我使用blueimp jQuery文件上传,并将一个裁剪过的图像直接上传到s3。在“添加”事件中,我将一个文件属性附加到formData中data.formData={acl:'public read',AWSAccessKeyId:res.s3Key,key:IMAGE\u PATH,policy:res.s3PolicyBase64,signature:res.s3Signature,file:data.files[0]}```
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="key"
events/1367541109750-
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="acl"
private
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="Content-Type"
image/jpeg
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="AWSAccessKeyId"
asdfasdfFASDFSDFAADSFHHVDQ
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="policy"
FsnY29udFuZ2UnLCAwLCAxMDAwMDAwMDBdLAogICAgICasdfasdfAgIFsgJ3N0YXJ0cy13aXRoJywgJyRrZXknLCAnJyBdLAogICAgICAgIFsgJ3N0YXJ0cy13aXRoJywgJyRDb250ZW50LVR5cGUnLCAnasdfJyBdLAo
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="name"
Policy134722343242345
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="success_action_status"
201
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="signature"
basdfasdftwa/9asdfasdfx3/zasdfadsft6g=
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="file"; filename="blob"
Content-Type: image/jpeg
------WebKitFormBoundaryxh8thnHAmDhZQuXE
Content-Disposition: form-data; name="filename"
C:\fakepath\495845894.jpg
------WebKitFormBoundaryxh8thnHAmDhZQuXE--