phpqrcode + save cached file to Amazon instead of folder on server - php

Question

What I do now is creating a QR code image (PNG) and save a copy of it in a folder on the root of my server. Now I would like to save this image not on my server but on my amazon bucket.
I know how I can save a file on amazon but I can't figure out how to make this work together.
This is my original code for saving it in a root folder on my server:
$fileName = $quiz_url . '.png';
$pngAbsoluteFilePath = APPLICATION_PATH . '/../public/qrcodecaches/' . $fileName;
$urlRelativeFilePath = '/qrcodecaches/' . $fileName;
// generating
if (!file_exists($pngAbsoluteFilePath)) {
QRcode::png('http://mysitelink.com/s/'.$quiz_url, $pngAbsoluteFilePath, 'L', 4, 2);
}
And this is how I save a file on Amazon:
$bucket = 'mybucket';
$map = 'qrcodecaches';
$client = S3Client::factory(array(
'key' => 'mykey',
'secret' => 'mysecret',
));
$fileName = $quiz_url . '.png';
$keyname = $map . '/' . $fileName;
try {
$client->putObject(array(
'Bucket' => $bucket,
'Key' => $keyname,
'Body' => fopen('/path/to/file', 'r'),
'ACL' => 'public-read',
));
} catch (S3Exception $e) {
echo "There was an error uploading the file.\n";
}
But what do I need to save in the 'Body' tag? Can somebody help me with this?

Answer 1

You can create the image file passing a temporary file name like this:
$pngAbsoluteFilePath = tempnam(sys_get_temp_dir(), 'qr_code_');
if (!file_exists($pngAbsoluteFilePath)) {
QRcode::png('http://mysitelink.com/s/'.$quiz_url, $pngAbsoluteFilePath, 'L', 4, 2);
}
then all you need to do is to get that file contents and pass it in to the Body of the object in bucket:
try {
$client->putObject(array(
'Bucket' => $bucket,
'Key' => $keyname,
'Body' => file_get_contents($pngAbsoluteFilePath), // like this
'ACL' => 'public-read'
));
}
catch (S3Exception $e) {
echo "There was an error uploading the file.\n";
}
After you're done - in case of successful upload - you can delete the temporary file. It is not necessary, however recommended because it will fill your /tmp with QR images until your server is restarted:
if ( empty($e) ) {
unlink($pngAbsoluteFilePath);
}
This worked well for me.

Answer 2

Amazon S3Client documentation suggests that you can poll to check that the upload was successful.
$client->waitUntilObjectExists(array(
'Bucket' => $bucket,
'Key' => $keyname
));
Alternatively if you're already writing the file to disk on your server you can supply S3Client with the path to that file and let it handle the filestream itself.
try {
$client->putObject(array(
'Bucket' => $bucket,
'Key' => $keyname,
'SourceFile' => '/path/to/file',
'ACL' => 'public-read'
));
} catch (S3Exception $e) {
echo "There was an error uploading the file.\n";
}
Source: http://docs.aws.amazon.com/aws-sdk-php/latest/class-Aws.S3.S3Client.html#_putObject