Question

尝试使用Alamofire上传短视频文件。 api是一个API网关端点，指向一个lambda函数，它处理视频然后将其存储在S3中。我只需要弄清楚为什么我无法正确地从发送到API的mac中获取视频。

func uploadVideo() {
    let buildUrl = URL(fileURLWithPath: pathToVideoFile)

    Alamofire.upload(buildUrl, to: apiUrl).responseJSON { response in
        debugPrint(response)
    }
}

Answer 1

我能够找到我正在尝试的默认上传过程的问题。我的视频文件大于AWS API Gateway支持的最大有效负载大小10MB，因此我可以通过请求AWS S3的预签名URL然后将视频直接发布到S3来创建解决方案

func getPresignedUrl() {
    let uploadUrl = URL(string: awsLambdaUrl)

    Alamofire.request(uploadUrl!, method: .put, parameters: ["filename": filename ], encoding: JSONEncoding.default).responseJSON { response in
        if let result = response.result.value {
            let JSON = result as! NSDictionary
            self.postToS3(JSON["url"] as! String)
        }
    }
}

func postToS3(_ url: String) {
    let buildUrl = URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0], isDirectory: true).appendingPathComponent("\(filename).mp4")
    Alamofire.upload(buildUrl, to: url, method: .put, headers: ["Content-Type": "video/mp4", "x-amz-acl": "public-read"]).responseString { response in
        if response.result.isSuccess {
            return self.deleteVideo()
        }
    }
}

处理预签名网址的AWS Lambda函数是：

const aws = require('aws-sdk');
const s3 = new aws.S3();

exports.handler = (event, context, callback) => {

    var params = {
        Bucket: 'YOUR_BUCKET_NAME', 
        Key: `${event.body.filename}.mp4`, 
        ACL: 'public-read',
        Expires: 120,
        ContentType: 'video/mp4'
    };

    s3.getSignedUrl('putObject', params, function (err, url) {
        if (err) {
            callback(err);
        } else {
            callback(null, { url });
        }
    });
};

Alamofire OSX上传视频

1 个答案: