One of the new features we announced in the 1.9.18 App Engine release is the ability to upload files directly to you application, without the need to upload the files to Google Cloud Storage first.
Direct uploads leverages the same in memory virtual filesystem that is used to provide temporary filesystem support. Direct uploads are only available with the PHP 5.5 runtime and are also limited to a maximum combined size of 32MB, which is the incoming request size limit.
Direct Upload Example
Following is a small sample application that demonstrates direct file uploads. This sample application:
- Uses HTML5 multiple file upload support to upload image files.
- Saves the original uploaded file into Google Cloud Storage.
- Creates a greyscale version of the uploaded image and writes that to Google Cloud Storage.
- Uses the image serving API to create links to serve the stored images at original size.
- Also uses the image serving API to create thumbnail links of the images, without the application having to create the thumbnails.
- Finally, displays a simple page with the thunbnailed links to the saved files.
For this application we’ll create 3 source files.
app.yaml
The app.yaml file has the following contents. Note that the runtime is php55.
application: php-uploads version: 1 runtime: php55 api_version: 1 threadsafe: true handlers: - url: /handle_upload script: handle_upload.php - url: .* script: direct_upload.php
direct_upload.php
This file presents a form for the user to upload multiple files to your application. As direct uploads are only in PHP 55 it checks that as well.
<?php
// Direct uploads requires PHP 5.5 on App Engine.
if (strncmp("5.5", phpversion(), strlen("5.5")) != 0) {
die("Direct uploads require the PHP 5.5 runtime. Your runtime: " . phpversion());
}
?>
<html>
<body>
<form action="handle_upload" method="post" enctype="multipart/form-data">
Send these files:<p/>
<input name="userfile[]" type="file" multiple="multiple"/><p/>
<input type="submit" value="Send files" />
</form>
</body>
</html>
handle_upload.php
The handle_upload script does the heavy lifting of creating the greyscale images, saving them in Cloud Storage and displaying the results. If you were doing this in a production app you’d need a lot more error handling, but I’ve left it out for brevity.
<?php
use google\appengine\api\cloud_storage\CloudStorageTools;
$bucket = CloudStorageTools::getDefaultGoogleStorageBucketName();
$root_path = 'gs://' . $bucket . '/' . $_SERVER["REQUEST_ID_HASH"] . '/';
$public_urls = [];
foreach($_FILES['userfile']['name'] as $idx => $name) {
if ($_FILES['userfile']['type'][$idx] === 'image/jpeg') {
$im = imagecreatefromjpeg($_FILES['userfile']['tmp_name'][$idx]);
imagefilter($im, IMG_FILTER_GRAYSCALE);
$grayscale = $root_path . 'gray/' . $name;
imagejpeg($im, $grayscale);
$original = $root_path . 'original/' . $name;
move_uploaded_file($_FILES['userfile']['tmp_name'][$idx], $original);
$public_urls[] = [
'name' => $name,
'original' => CloudStorageTools::getImageServingUrl($original),
'original_thumb' => CloudStorageTools::getImageServingUrl($original, ['size' => 75]),
'grayscale' => CloudStorageTools::getImageServingUrl($grayscale),
'grayscale_thumb' => CloudStorageTools::getImageServingUrl($grayscale, ['size' => 75]),
];
}
}
?>
<html>
<body>
<?php
foreach($public_urls as $urls) {
echo '<a href="' . $urls['original'] .'"><IMG src="' . $urls['original_thumb'] .'"></a> ';
echo '<a href="' . $urls['grayscale'] .'"><IMG src="' . $urls['grayscale_thumb'] .'"></a>';
echo '<p>';
}
?>
<p>
<a href="/">Upload More</a>
</body>
</html>
If you stumble across any problems, please let us know on either stack overflow or by creating an issue in our tracker.