如何获取文件的上传日期Amazon S3，AWS IOS SDK [英] How to get upload date of a file Amazon S3, AWS IOS SDK

问题描述

我有一个S3桶里面有文件。我可以在我的应用程序中成功下载并显示该文件。

但是，我想知道如果文档是最新的或不是。使用Firefox S3扩展，我可以看到在文件桶文件名中，文件大小和上传时间都保存到S3。上传时间的一个例子是 10/10/2012 11:35 PM

获取url我使用

  dispatch_queue_t queue = dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_DEFAULT，0）; 
 dispatch_async（queue，^ {
 
 //设置内容类型，以便浏览器将URL视为图像
 S3ResponseHeaderOverrides * override = [[S3ResponseHeaderOverrides alloc] init ]; 
 override.contentType = @; 
 
 //请求已经被重新编码的图片的预先签名的URL 
 S3GetPreSignedURLRequest * gpsur = [[S3GetPreSignedURLRequest alloc] init]; 
 gpsur.key = _fileName; 
 gpsur.bucket = [常量pictureBucket]; 
 gpsur.expires = [NSDate dateWithTimeIntervalSinceNow：（NSTimeInterval）3600]; //添加了一小时的值当前时间的秒数
 gpsur.responseHeaderOverrides = override; 
 
 //获取URL 
 NSError *错误; 
 NSURL * url = [self.s3 getPreSignedURL：gpsur错误：& error]; 
  

如何在Amazon上获取文件的上传日期S3？

EDIT :::: ANSWER

可以通过以下方法回答我可以得到日期

  S3GetObjectMetadataRequest * getMetadataRequest = [[S3GetObjectMetadataRequest alloc] initWithKey：_fileName withBucket：[Constants pictureBucket]]; 
 S3GetObjectMetadataResponse * getMetadataResponse = [self.s3 getObjectMetadata：getMetadataRequest]; 
 
 NSString * fileLastModifiedDate = [[NSString alloc] init]; 
 fileLastModifiedDate = [NSString stringWithFormat：@％@，getMetadataResponse.lastModified]; 
 NSLog（@上次修改日期％@，fileLastModifiedDate）; 
  

解决方案

您必须制作一个S3GetObjectMetadataRequest。

  S3GetObjectMetadataRequest * getMetadataRequest = [[S3GetObjectMetadataRequest alloc] initWithKey：filePath withBucket：BUCKET_NAME]; 
 S3GetObjectMetadataResponse * getMetadataResponse = [self getObjectMetadata：getMetadataRequest]; 
  

http://docs.amazonwebservices.com/AmazonS3/latest/dev/UsingMetadata.html

I have a S3 bucket with files in it. I can successfully download and display the file on my app.

However I want to learn that if the document is the latest or not. With Firefox S3 extension I can see that in bucket file name, file size and upload time are saved to S3. An example of upload time is 10/10/2012 11:35 PM

to get url I use

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_async(queue, ^{

        // Set the content type so that the browser will treat the URL as an image.
        S3ResponseHeaderOverrides *override = [[S3ResponseHeaderOverrides alloc] init];
        override.contentType = @" ";

        // Request a pre-signed URL to picture that has been uplaoded.
        S3GetPreSignedURLRequest *gpsur = [[S3GetPreSignedURLRequest alloc] init];
        gpsur.key                     = _fileName;
        gpsur.bucket                  = [Constants pictureBucket];
        gpsur.expires                 = [NSDate dateWithTimeIntervalSinceNow:(NSTimeInterval) 3600]; // Added an hour's worth of seconds to the current time.
        gpsur.responseHeaderOverrides = override;

        // Get the URL
        NSError *error;
        NSURL *url = [self.s3 getPreSignedURL:gpsur error:&error];

How can I get upload date of a file on Amazon S3?

EDIT::::ANSWER

OK thanks to answer with following method I can get the date

S3GetObjectMetadataRequest *getMetadataRequest = [[S3GetObjectMetadataRequest alloc] initWithKey:_fileName withBucket:[Constants pictureBucket]];
        S3GetObjectMetadataResponse *getMetadataResponse = [self.s3 getObjectMetadata:getMetadataRequest];

        NSString *fileLastModifiedDate = [[NSString alloc] init];
        fileLastModifiedDate = [NSString stringWithFormat:@"%@",getMetadataResponse.lastModified];
        NSLog(@"Last Modified date %@",fileLastModifiedDate);

解决方案

You have to make a S3GetObjectMetadataRequest.

S3GetObjectMetadataRequest *getMetadataRequest = [[S3GetObjectMetadataRequest alloc] initWithKey:filePath withBucket:BUCKET_NAME];
S3GetObjectMetadataResponse *getMetadataResponse = [self getObjectMetadata:getMetadataRequest];

http://docs.amazonwebservices.com/AmazonS3/latest/dev/UsingMetadata.html

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