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Usage with Symfony
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===============
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Overview for using ZipStream in Symfony
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--------
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Using ZipStream in Symfony requires use of Symfony's ``StreamedResponse`` when
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used in controller actions.
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Wrap your call to the relevant ``ZipStream`` stream method (i.e. ``addFile``,
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``addFileFromPath``, ``addFileFromStream``) in Symfony's ``StreamedResponse``
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function passing in any required arguments for your use case.
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Using Symfony's ``StreamedResponse`` will allow Symfony to stream output from
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ZipStream correctly to users' browsers and avoid a corrupted final zip landing
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on the users' end.
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Example for using ``ZipStream`` in a controller action to zip stream files
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stored in an AWS S3 bucket by key:
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.. code-block:: php
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use Symfony\Component\HttpFoundation\StreamedResponse;
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use Aws\S3\S3Client;
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use ZipStream;
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//...
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/**
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* @Route("/zipstream", name="zipstream")
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*/
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public function zipStreamAction()
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{
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//sample test file on s3
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$s3keys = array(
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"ziptestfolder/file1.txt"
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);
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$s3Client = $this->get('app.amazon.s3'); //s3client service
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$s3Client->registerStreamWrapper(); //required
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//using StreamedResponse to wrap ZipStream functionality for files on AWS s3.
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$response = new StreamedResponse(function() use($s3keys, $s3Client)
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{
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// Define suitable options for ZipStream Archive.
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$options = new \ZipStream\Option\Archive();
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$options->setContentType('application/octet-stream');
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// this is needed to prevent issues with truncated zip files
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$options->setZeroHeader(true);
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$options->setComment('test zip file.');
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//initialise zipstream with output zip filename and options.
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$zip = new ZipStream\ZipStream('test.zip', $options);
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//loop keys - useful for multiple files
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foreach ($s3keys as $key) {
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// Get the file name in S3 key so we can save it to the zip
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//file using the same name.
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$fileName = basename($key);
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//concatenate s3path.
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$bucket = 'bucketname'; //replace with your bucket name or get from parameters file.
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$s3path = "s3://" . $bucket . "/" . $key;
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//addFileFromStream
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if ($streamRead = fopen($s3path, 'r')) {
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$zip->addFileFromStream($fileName, $streamRead);
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} else {
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die('Could not open stream for reading');
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}
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}
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$zip->finish();
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});
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return $response;
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}
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In the above example, files on AWS S3 are being streamed from S3 to the Symfon
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application via ``fopen`` call when the s3Client has ``registerStreamWrapper``
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applied. This stream is then passed to ``ZipStream`` via the
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``addFileFromStream`` function, which ZipStream then streams as a zip to the
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client browser via Symfony's ``StreamedResponse``. No Zip is created server
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side, which makes this approach a more efficient solution for streaming zips to
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the client browser especially for larger files.
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For the above use case you will need to have installed
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`aws/aws-sdk-php-symfony <https://github.com/aws/aws-sdk-php-symfony>`_ to
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support accessing S3 objects in your Symfony web application. This is not
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required for locally stored files on you server you intend to stream via
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``ZipStream``.
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See official Symfony documentation for details on
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`Symfony's StreamedResponse <https://symfony.com/doc/current/components/http_foundation.html#streaming-a-response>`_
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``Symfony\Component\HttpFoundation\StreamedResponse``.
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Note from `S3 documentation <https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/s3-stream-wrapper.html>`_:
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Streams opened in "r" mode only allow data to be read from the stream, and
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are not seekable by default. This is so that data can be downloaded from
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Amazon S3 in a truly streaming manner, where previously read bytes do not
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need to be buffered into memory. If you need a stream to be seekable, you
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can pass seekable into the stream context options of a function.
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Make sure to configure your S3 context correctly!
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Uploading a file
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--------
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You need to add correct permissions
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(see `#120 <https://github.com/maennchen/ZipStream-PHP/issues/120>`_)
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**example code**
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.. code-block:: php
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$path = "s3://{$adapter->getBucket()}/{$this->getArchivePath()}";
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// the important bit
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$outputContext = stream_context_create([
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's3' => ['ACL' => 'public-read'],
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]);
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fopen($path, 'w', null, $outputContext); |
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\ No newline at end of file |
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