PHP Amazon AWS S3 - Upload object using Pre-Signed URL

Question

I am trying to generate a URL that other system can use to upload a file to my S3 bucket. I looked over the documentation and similar issues, however, I cannot find the right solution.

I have tried creating the PreSigned URL multiple ways ($this->s3 is a reference so S3Client):

1:

       $signedUrl = $this->s3->getCommand(
            'PutObject',
            array(
                'Bucket' => $this->bucket,
                'Key' => 'recording_test.mp3',
                'Body' => ''
            )
        )->createPresignedUrl('+2 hours');

2:

    $command = $this->s3->getCommand('PutObject', array('Bucket' => $this->bucket, 'Key' => 'recording_test3.mp3', 'Body' => ''));

    $request = $command->prepare();

    $signedUrl = $this->s3->createPresignedUrl($request, '+2 hours');

When trying to simply access the URL I get following error:

The request signature we calculated does not match the signature you provided. Check your key and signing method.

I have also tried it this way: $key = 'recording_test2.mp3'; $url = $this->bucket.'/'.$key;

    $request = $this->s3->put($url);

    $signedUrl = $this->s3->createPresignedUrl($request, '+2 hours');

However, this generates a URL in format of s3.amazonaws.com/bucket/key..., which yields an error about invalid endpoint, and that endpoint in format bucket.s3.amazonaws.com/key... should be used. Manually changing the URL gives the same invalid signature error as per above.

I cannot see what am I doing wrong or any other way to generate the PreSigned URL?

Thanks for help

Also, in the error details, there is StringToSign field, which is different depending if I just open the URL, or I use it in a form with file upload - not sure if that has to do with anything? If so, how can I make sure the URL is good for uploading a file to the bucket? — Giedrius
– Giedrius, Commented Oct 6, 2016 at 15:10
not sure if you you still have same issue, but you should access the link with a put request, not get or post method — Nourdine Alouane
– Nourdine Alouane, Commented Mar 23, 2017 at 17:17

Marinus · Accepted Answer · 2017-05-30 04:17:22Z

0

When creating your signed URL, you should not use the Body key. The signed URL generated includes a signature of the body to be uploaded. Then, when you try upload a file using the URL, it can't match the empty string you are using to the content of the file.

Also, if you are using Curl to put the file, I recommend using \CURLFile, and remember to use curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT"); for your PUT request.

answered May 30, 2017 at 4:17

Marinus

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