blocks|key|1058640|text|不，他们需要提供一个API来允许您首先上传多个文件。这是API的一个限制，而不是预签名.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1058641|见是否有可能执行批处理上传到亚马逊s3？。|offset|length|1058642|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/q/15050146/241294^0|0|1|J|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

No, they would need to provide an API to allow you to upload multiple files first. This is a limitation of the API, not pre-signing.

See <a href="https://stackoverflow.com/q/15050146/241294">Is it possible to perform a batch upload to amazon s3?</a>.

blocks|key|557470|text|这是绝对可能的，而且已经有很多年了。在生成预先签名的URL+(特别是conditions+)时，必须使用starts-with。见官方的Amazon文档。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|557471|举个例子，这里是Boto3生成一个预先签名的POST+url的Python：|557472|++++response+=+s3.generate_presigned_post(
++++++++"BUCKET_NAME",
++++++++"uploads/${filename}",
++++++++Fields=None,
++++++++Conditions=[["starts-with",+"$key",+"uploads/"]],
++++++++ExpiresIn=(10+*+60),
++++)|code-block|syntax|javascript|557473|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html#sigv4-ConditionMatching^0|Y|A|1G|B|1W|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

This is absolutely possible and has been for years. You must use <code>conditions</code> when generating a presigned URL, specifically <code>starts-with</code>. See the official <a href="https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html#sigv4-ConditionMatching" rel="noreferrer">Amazon Documentation</a>.
As an example, here is Python with Boto3 generating a presigned POST url:
<pre><code> response = s3.generate_presigned_post(
 &quot;BUCKET_NAME&quot;,
 &quot;uploads/${filename}&quot;,
 Fields=None,
 Conditions=[[&quot;starts-with&quot;, &quot;$key&quot;, &quot;uploads/&quot;]],
 ExpiresIn=(10 * 60),
 )
</code></pre>

blocks|key|302345|text|不是的。预先签名的URL仅对一个对象有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302346|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

No. A pre-signed URL is valid for only one object.

blocks|key|302328|text|首先，AWS+S3是一个键值存储，每个对象aaa/bbb/ccc/ddd/index.html只是一个名称。没有“文件夹”的概念(即使您可能有一个错误的印象，它们存在于UI中)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|302329|为了为多个“文件”创建一个单一的预签名url，您必须做一些预处理。在本地拉出所有必要的文件，对它们进行压缩，并将压缩存档放在S3上，然后生成预签名的zip归档的URL。|302330|entityMap^0|L|Q|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

First things first:
AWS S3 is a key value store, each object <code>aaa/bbb/ccc/ddd/index.html</code> is just one name. There is no concept of "folders" ( even though you might have a false impression that they exists from the UI ). 

In order to create a single presigned url for multiple "files" you have to do some preprocessing. Pull all necessary files locally, zip them and put zip archive on S3, then generate presigned URL of zip archive.

blocks|key|302358|text|对于任何在2021年看到这个问题的人来说--我发现从一个S3桶下载一个完整的“文件夹”的最简单的方法就是改变我上传“文件夹”的方式。我没有递归地上传，而是将对象压缩到一个zip存档中，然后上传zip存档。它不是直接回答问题，而是一个快速的解决办法。下面是我用来解决这个问题的示例python代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302359|from+shutil+import+make_archive|offset|length|style|CODE|302360|from+boto3+import+client|302361|make_archive(name_of_zipped_folder,+'zip',+path_to_outdir)|302362|然后将这个压缩文件夹上传到s3|302363|aws+s3+cp+name_of_zipped_folder+s3://bucket_name/name_of_zipped_folder|302364|然后使用boto3代码为该压缩文件夹生成预先签名的urls。|302365|client('s3',+'us-east-1').generate_presigned_url('get_object',+Params={'Bucket':+bucket_name,'Key':+name_of_zipped_folder},+ExpiresIn=120)|302366|entityMap^0|0|0|V|0|0|O|0|0|1M|0|0|0|1Y|0|0|0|3U|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|15|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1A|8|@$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|U|$]]

For anyone else looking at this issue in 2021 - the easiest way that I found to download an entire &quot;folder&quot; of files from an S3 bucket was to change how I uploaded a &quot;folder&quot;. Instead of recursively uploading, I swapped to zip the objects into a single zip archive, then upload the zip archive. It doesn't directly answer the question but is a quick work-around. Here is the example python code that I used to get around this problem:
<code>from shutil import make_archive</code>
<code>from boto3 import client</code>
<code>make_archive(name_of_zipped_folder, 'zip', path_to_outdir)</code>
Then upload this zipped folder to s3
<code>aws s3 cp name_of_zipped_folder s3://bucket_name/name_of_zipped_folder</code>
Then use boto3 code to generate presigned urls for that zipped folder
<code>client('s3', 'us-east-1').generate_presigned_url('get_object', Params={'Bucket': bucket_name,'Key': name_of_zipped_folder}, ExpiresIn=120)</code>

blocks|key|557452|text|这将为S3上的现有对象生成一个预先签名的URL。在您的示例中，您可以列出所有对象(使用keyName)并递归调用上面的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|557453|public+String+generatePreSignedUrl(String+bucketName,+String+keyName){

++++Date+expiration+=+new+Date();
++++long+mSec+=+60000l;+++++//Time+in+millis
++++expiration.setTime(mSec);

++++GeneratePresignedUrlRequest+generatePresignedUrlRequest+=+new+GeneratePresignedUrlRequest(bucketName,+keyName);
++++generatePresignedUrlRequest.setMethod(HttpMethod.GET);
++++generatePresignedUrlRequest.setExpiration(expiration);

++++URL+url+=+s3.generatePresignedUrl(generatePresignedUrlRequest);
++++return+url.toString();
}|code-block|syntax|javascript|557454|PS:+AWS提供API来列出桶下的对象&您可以选择所需的对象。|557455|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This would generate a pre-signed URL for the existing object on the S3. In your case you could list down all the objects (using the keyName) and call the above method recursively.
<pre><code>public String generatePreSignedUrl(String bucketName, String keyName){

 Date expiration = new Date();
 long mSec = 60000l; //Time in millis
 expiration.setTime(mSec);

 GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(bucketName, keyName);
 generatePresignedUrlRequest.setMethod(HttpMethod.GET);
 generatePresignedUrlRequest.setExpiration(expiration);

 URL url = s3.generatePresignedUrl(generatePresignedUrlRequest);
 return url.toString();
}
</code></pre>
PS: The AWS SDK provides API to list down the objects under the bucket &amp; you could pick the required objects.

blocks|key|302456|text|由于预先签名的URL适用于单个对象，一种方法是为每个文件(对象)生成签名。这可以通过一个循环来实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302457|下面是代码片段：|302458|def+upload_files(folder_path,+bucket_name,+access_key,secret_access_key):

++++s3_client+=+boto3.client('s3',+aws_access_key_id=access_key,+aws_secret_access_key=secret_access_key)

++++for+filename+in+os.listdir(folder_path):
++++++++f+=+os.path.join(folder_path,+filename)+#crawls+through+each+file+in+the+directory
++++++++response+=+s3_client.generate_presigned_post(Bucket+=+bucket_name,
++++++++++++++++Key=f,+ExpiresIn+=+100)+#+generates+signature+for+each+file
++++++++file+=+{'file':+open(f,+'rb')}
++++++++r+=+requests.post(response['url'],+data=response['fields'],files=file)
++++++++print(r.status_code)|code-block|syntax|javascript|302459|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Since pre-signed URL is applicable for single object, one way is by generating signature for each file (object). This can be achieved by passing through a loop.
Here's the code snippet:
<pre><code>def upload_files(folder_path, bucket_name, access_key,secret_access_key):

 s3_client = boto3.client('s3', aws_access_key_id=access_key, aws_secret_access_key=secret_access_key)

 for filename in os.listdir(folder_path):
 f = os.path.join(folder_path, filename) #crawls through each file in the directory
 response = s3_client.generate_presigned_post(Bucket = bucket_name,
 Key=f, ExpiresIn = 100) # generates signature for each file
 file = {'file': open(f, 'rb')}
 r = requests.post(response['url'], data=response['fields'],files=file)
 print(r.status_code)
</code></pre>

I have written an implementation for generating pre-signed URLS for a bucket on aws-s3. It works fine, for getting single files/objects.

How would I go about this for generating pre-signed URLS for entire directories? Lets put it this way, on my s3 bucket, there are multiple folders with their own small html5 applications. Each folder has their own set of html, css, js, as well as media files. I wouldn't be generating a pre-signed URL for single object, in this case.

If I give a pre-signed url for a single file, for example: an index.html for a folder, that file would also need to load css, js, and media files as well. Files we don't have a signed url for.

I'm just not too sure on how to go about implementing this.

Pre-signed url for multiple files?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我编写了一个实现，用于为aws-s3上的桶生成预签名的URLS。它可以正常工作，用于获取单个文件/对象。我如何为整个目录生成预先签名的URLS呢？让我们这样说吧，在我的s3桶上，有多个文件夹，它们有自己的小html5应用程序。每个文件夹都有自己的html、css、js以及媒体文件集。在这种情况下，我不会为单个对象生成一个预先签名的URL。如果我为单个文件提供一个预先签名的url，例如:一个文件夹的

问多个文件的预签名url？
EN

回答 7

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问多个文件的预签名url？EN

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