Alamofire 和预签名的 url 上传对象

Posted 2023-03-15

【中文标题】Alamofire 和预签名的 url 上传对象

【英文标题】：Alamofire and Pre-signed url upload object

【发布时间】：2017-01-26 10:24:35

【问题描述】：

目前我正在尝试使用 Alamofire 上传图片，来自 Amazon 的示例实现如下：http://docs.aws.amazon.com/AmazonS3/latest/dev/PresignedUrlUploadObject.html

.NET 版本代码：

private void UploadS3FileByPresignedUrl(string url, string localFile, string contentType)
    
        using (var client = new HttpClient())
        
            using (var stream = File.OpenRead(localFile))
            
                //// Need to add contentType otherwise the StreamContent is "binary/octet-stream"
                var fileContent = new StreamContent(stream);
                fileContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);
                var response = client.PutAsync(url, fileContent).Result;
                response.EnsureSuccessStatusCode();
            

        
    

基本上我必须在两个条件下上传图片：

只支持jpg图片文件。 客户端获取上传URL后，需要使用内容类型为“image/jpeg”的HTTP PUT上传个人资料图片这里是.NET客户端的示例代码

我正在尝试通过使用 Alamofire 来做到这一点，但我没有成功...

我正在使用 swift 3 和 Alamofire 4，目前我有这个代码：

let image = UIImage(named: "Sky-Sunset")

        Alamofire.upload(multipartFormData: multipartFormData in
            multipartFormData.append(UIImageJPEGRepresentation(image!, 0.5)!, withName: "photo_path", fileName: "swift_file.jpeg", mimeType: "image/jpeg"),
                         usingThreshold:UInt64.init(),
                         to:".../my/profile/image/uploadurl",
                         method:.put,
                         headers:["Content-Type": "image/jpeg"],
                         encodingCompletion:  encodingResult in
                            switch encodingResult 
                            case .success(let upload, _, _):
                                upload.responseJSON  response in
                                    debugPrint(response)
                                
                            case .failure(let encodingError):
                                print(encodingError)
                            
        )

【参考方案1】：

我建议使用适用于 ios 的 AWS 开发工具包，对于预签名的 url 支持，您可以关注文档@https://docs.aws.amazon.com/mobile/sdkforios/developerguide/s3-pre-signed-urls.html

AWSS3PreSignedURLBuilder.default().getPreSignedURL(getPreSignedURLRequest).continueWith  (task:AWSTask<NSURL>) -> Any? in
    if let error = task.error as? NSError 
        print("Error: \(error)")
        return nil
    

    let presignedURL = task.result
    print("Download presignedURL is: \(presignedURL)")

    Alamofire.upload(
       multipartFormData:  multipartFormData in
             multipartFormData.append(unicornImageURL, withName: "unicorn")
             multipartFormData.append(rainbowImageURL, withName: "rainbow")
       ,
       to:presignedURL.absoluteString
       ...
    return nil