Download file from Amazon S3 with lumen/php

Question

According to the resource given in the AWS documentation, downloading object can be done with the following code:

public function download($folder, $file)
    {
        $s3 = new S3Client([
            'region'  => env('AWS_REGION'),
            'version'=>'latest',
            'credentials' => [
                'key'    =>env('AWS_ACCESS_KEY_ID'),
                'secret' =>env('AWS_SECRET_ACCESS_KEY')
            ],
        ]);
        $result = $s3->getObject([
            'Bucket'                     => env('AWS_BUCKET'),
            'Key'                        => $folder.'/'.$file,
            'ResponseContentType'        => 'text/plain',
            'ResponseContentLanguage'    => 'en-US',
            'ResponseContentDisposition' => 'attachment; filename='.$file,
            'ResponseCacheControl'       => 'No-cache',
            'ResponseExpires'            => gmdate(DATE_RFC2822, time() + 3600),
        ]);
        header("Content-Type: {$result['ContentType']}");
        echo $result['Body'];
    }

According the docs the above code should display a pdf file (in my case), it opens a pdf but says

Failed to load PDF document.

The file is the s3 don't have any issue, I know it the code. But what can I do to the browser to read and also download automatically?

For detail info, I followed this link https://docs.aws.amazon.com/AmazonS3/latest/userguide/download-objects.html and went to using AWS SDKs

EDIT

I changed 'ResponseContentType' => 'plain/text' to 'ResponseContentType' => 'application/pdf' , it opened the pdf but now I need to download it

Answer 1

This should most likely be:

'ResponseContentType' => 'application/pdf',

Else it will be transferred as text and will result in a corrupt file.

Answer 2

Adding header in the code like below solved my issue:

public function download($folder, $file)
    {
        $s3 = new S3Client([
            'region'  => env('AWS_REGION'),
            'version'=>'latest',
            'credentials' => [
                'key'    =>env('AWS_ACCESS_KEY_ID'),
                'secret' =>env('AWS_SECRET_ACCESS_KEY')
            ],
        ]);
        $result = $s3->getObject([
            'Bucket'                     => env('AWS_BUCKET'),
            'Key'                        => $folder.'/'.$file,
            'ResponseContentLanguage'    => 'en-US',
            'ResponseCacheControl'       => 'No-cache',
            'ResponseExpires'            => gmdate(DATE_RFC2822, time() + 3600),
        ]);
        header("Cache-Control: public");
        header("Content-Description: File Transfer");
        header("Content-Disposition: attachment; filename=" . $file);
        header("Content-Type: {$result['ContentType']}");
        echo $result['Body'];
    }

I already wrote on EDIT that changing 'ResponseContentType' => 'plain/text' to 'ResponseContentType' => 'application/pdf' opened the pdf but I choose to not include ResponseContentType on my code so that it can it any file type.