我想使用预先签名的URL将文件从iOS App上传到AWS S3存储桶. URL是正确的,因为它在命令行上使用curl.

curl -v -k --upload-file FILENAME "https://MYBUCKET.amazonaws.com:443/KEYNAME?Signature=...&Expires=1391691489&AWSAccessKeyId=..."

使用以下Objective-C代码……

- (void)upload:(Nsstring *)url fileData:(NSData *)fileData
{
    NSMutableuRLRequest *request = [[NSMutableuRLRequest alloc] init];
    [request setURL:[NSURL URLWithString:url]];
    [request setHTTPMethod:@"PUT"];
    [request setHTTPBody:fileData];
    [request setValue:[Nsstring stringWithFormat:@"%d",[fileData length]] forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"audio/mpeg" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"public-read" forHTTPHeaderField:@"x-amz-acl"];
    [request setValue:@"iPhone-OS/6.0 fr_FR NE" forHTTPHeaderField:@"User-Agent"];

    _connection = [NSURLConnection connectionWithRequest:request delegate:self];
    [_connection start];
}

…我收到此错误：

Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x9c49560 {NSErrorFailingURLStringKey=https://MYBUCKET.s3.amazonaws.com:443/KEYNAME?Signature=...&Expires=1391703958&AWSAccessKeyId=...,NSErrorFailingURLKey=https://MYBUCKET.amazonaws.com:443/KEYNAME?Signature=...&Expires=1391703958&AWSAccessKeyId=...,NSLocalizedDescription=The request timed out.,NSUnderlyingError=0x9c48c80 "The request timed out."}

我使用WireShark查看是否有任何流量,并且流量很大.

我不知道我的代码有什么问题.似乎文件传输没有正确终止.

我自己解决了这个问题Content-Type标头是罪魁祸首.在绝望中,我用一个非常小的文本文件测试了我的代码,并从S3获得了403作为HTTP状态代码.没有超时.这样的进步.我还收到了一条非常丰富的错误消息：

<?xml version="1.0" encoding="UTF-8"?>
<Error>
    <Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><StringToSignBytes>...</StringToSignBytes><RequestId>...</RequestId><HostId>...</HostId><SignatureProvided>...</SignatureProvided>
    <StringToSign>PUT

    text/plain
    1391784394
    KEYNAME</StringToSign>
    <AWSAccessKeyId>...</AWSAccessKeyId>
</Error>

显然,如果从客户端提供内容类型字符串(在本例中为text / plain),则在字符串到符号中是预期的.不要问我为什么这会导致大(5.5MB？)文件超时.我希望这能为其他人节省几个小时的生命.

最简单的解决方法是删除该行

[request setValue:@"..." forHTTPHeaderField:@"Content-Type"];

如果您在创建预签名URL时知道内容类型,则可以将字符串添加到字符串到符号.

所有aws-sdk-ios示例都使用awss3transfermanager异步上传数据.

例如：https://github.com/awslabs/aws-sdk-ios-samples/blob/master/S3TransferManager-Sample/Swift/S3TransferManagerSampleSwift/UploadViewController.swift#L81

现在通常,这很好,但由于其他原因,我的工作已经在NSOperation子类中了,所以我想同步上传到S3以保持简单(否则,我需要实现异步NSOperation,并且更多样板……)

有人知道怎么做吗？

如果有人好奇,我想出来：

let credentialsProvider = AWSCognitoCredentialsProvider(regionType: AWSRegionType.USEast1,identityPoolId: AwsCognitoIdentityPoolId)
    let configuration = AWSServiceConfiguration(region: AWSRegionType.USEast1,credentialsProvider: credentialsProvider)
    AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = configuration

    let S3Client = AWSS3.defaultS3()
    let putObjectRequest = AWSS3PutObjectRequest()
    putObjectRequest.bucket = AwsBucketName
    putObjectRequest.key = key
    putObjectRequest.body = logFilePathURL

    do {
        let fileAttributes = try self.fileManager.attributesOfItemAtPath(logFilePathURL.path!)
        let fileSizeNumber = fileAttributes[NSFileSize] as! NSNumber
        putObjectRequest.contentLength = NSNumber(longLong: fileSizeNumber.longLongValue)
    } catch _ as NSError {
        // Todo handle error
    }

    S3Client.putObject(putObjectRequest).continueWithBlock { (task: AWSTask) -> AnyObject? in
        return nil
    }.waitUntilFinished()

…是啊.我无法在任何地方找到一个例子,所以我必须阅读源代码并解决问题.至于那个aws-sdk-ios库,谈论过度工程……需要一段时间才能通过所有这些间接层来弄明白.

无论如何,在我返回nil的最后一个区块中,你处理错误等等.

我正在尝试将文件上传到我的Amazon S3 Bucket. S3和亚马逊成立.
这是亚马逊的错误消息：

Conflicting query string parameters: acl,policy

策略和签名被编码,对于Node.js使用Crypto.js

var crypto=Npm.require("crypto");

我正在尝试使用Meteor HTTP.post方法构建POST请求.这也可能是错误的.

var BucketName="mybucket";
    var AWSAccessKeyId="MY_ACCES_KEY";
    var AWSSecretKey="MY_SECRET_KEY";

    //create policy
    var POLICY_JSON={
        "expiration": "2009-01-01T00:00:00Z","conditions": [ 
            {"bucket": BucketName},["starts-with","$key","uploads/"],{"acl": 'public-read'},"$Content-Type",""],["content-length-range",1048576],]   
    }
    var policyBase64=encodePolicy(POLICY_JSON);
    //create signature
    var SIGNATURE = encodeSignature(policyBase64,AWSSecretKey);
    console.log('signature: ',SIGNATURE);

这是我与Meteor一起使用的POST请求：

//Send data----------
    var options={
        "params":{
            "key":file.name,'AWSAccessKeyId':AWSAccessKeyId,'acl':'public-read','policy':policyBase64,'signature':SIGNATURE,'Content-Type':file.type,'file':file,"enctype":"multipart/form-data",}
    }

    HTTP.call('POST','https://'+BucketName+'.s3.amazonaws.com/',options,function(error,result){
        if(error){
            console.log("and HTTP ERROR:",error);
        }else{
            console.log("result:",result);
        }
    });

她正在编码政策和签名：

encodePolicy=function(jsonPolicy){
    // stringify the policy,store it in a NodeJS Buffer object
    var buffer=new Buffer(JSON.stringify(jsonPolicy));
    // convert it to base64
    var policy=buffer.toString("base64");
    // replace "/" and "+" so that it is URL-safe.
    return policy.replace(/\//g,"_").replace(/\+/g,"-");
}

encodeSignature=function(policy,secret){
    var hmac=crypto.createHmac("sha256",secret);
    hmac.update(policy);
    return hmac.digest("hex");
}

A不知道发生了什么. POST方法或加密可能已经有问题,因为我不太了解这些方法.如果有人可以指出我正确的方向,编码或发送POST请求到AmazonS3正确,它可以帮助很多.
(我不喜欢使用filepicker.io,因为我不想强制客户端在那里注册.)

提前致谢！！！

直接上传到S3可以使用 slingshot包：

meteor add edgee:slingshot

在服务器端声明您的指令：

Slingshot.createDirective("myFileUploads",Slingshot.S3Storage,{
  bucket: "mybucket",allowedFileTypes: ["image/png","image/jpeg","image/gif"],acl: "public-read",authorize: function () {
    //You can add user restrictions here
    return true;
  },key: function (file) {
    return file.name;
  }
});

该指令将自动生成策略和签名.

他们只是上传它：

var uploader = new Slingshot.Upload("myFileUploads");

uploader.send(document.getElementById('input').files[0],function (error,url) {
  Meteor.users.update(Meteor.userId(),{$push: {"profile.files": url}});
});