PHP Amazon AWS S3-使用预签名URL上传对象

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

Answer 1

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.