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Bakame PSR-7 Adapter

This package enables converting a PSR-7 StreamInterface objects into a PHP stream. This make it possible to work with functions and class which expect a PHP stream resource like League CSV object package.

The included StreamWrapper class is heavily inspired/copied from the excellent Guzzle/Psr7 package written by Michael Dowling which uses the MIT License

Requirements

You need PHP >= 7.3 but the latest stable version of PHP is recommended.

Installation

Install bakame/psr7-adapter using Composer.

$ composer require bakame/psr7-adapter

Documentation

StreamWrapper::streamToResource

StreamWrapper::streamToAppendableResource

<?php

use Psr\Http\Message\StreamInterface;
use Bakame\Psr7\Adapter\StreamWrapper;

public static StreamWrapper::streamToResource(StreamInterface $stream): resource;
public static StreamWrapper::streamToAppendableResource(StreamInterface $stream): resource;

returns a PHP stream resource from a PSR-7 StreamInterface object.

Parameters

  • $stream : a object implementing PSR-7 StreamInterface interface.

Returned values

A PHP stream resource

Exception

A Bakame\Psr7\Adapter\UnableToWrapStream will be triggered when the following situations are encountered:

  • If the StreamInterface is not readable and writable
  • If the stream resource could not be created.

Usage example

Here's a simple usage with League\Csv.

<?php

use Bakame\Psr7\Adapter\StreamWrapper;
use League\Csv\Reader;
use League\Csv\Writer;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\ResponseInterface;

final class CsvDelimiterSwitcherAction
{
    public function __construct(
        private string $inputDelimiter,
        private string $outputDelimiter
    ) {
    }

    public function __invoke(ServerRequestInterface $request, ResponseInterface $response): ResponseInterface
    {
        //let's create a CSV Reader object from the submitted file
        $inputCsv = $request->getUploadedFiles()['csv'];
        $reader = Reader::createFromStream(
            StreamWrapper::streamToResource($inputCsv->getStream())
        );
        $reader->setDelimiter($inputDelimiter);
        
        $psr7stream = $response->getBody();
        $psr7stream->write($reader->getInputBOM());
    
        //let's create a CSV Writer object from the response body
        //because we already wrote to the stream we need to have an appendable resource 
        $writer = Writer::createFromStream(
            StreamWrapper::streamToAppendableResource($psr7stream);
        );
        //we convert the delimiter
        $writer->setDelimiter($outputDelimiter);
        $writer->insertAll($reader);
    
        //we add CSV header to enable downloading the converter document
        return $response
            ->withHeader('Content-Type', 'text/csv, charset=utf-8')
            ->withHeader('Content-Transfer-Encoding', 'binary')
            ->withHeader('Content-Description', 'File Transfer')
            ->withHeader('Content-Disposition', 'filename=csv-'.(new DateTimeImmutable())->format('Ymdhis').'.csv')
        ;
    }
}

In both cases, the StreamInterface objects are never detached or removed from their parent objects (ie the Request object or the Response object), the CSV objects operate on their StreamInterface property using the adapter stream returned by resource_from.

Testing

The package has:

  • a PHPUnit test suite
  • a coding style compliance test suite using PHP CS Fixer.
  • a code analysis compliance test suite using PHPStan.

To run the tests, run the following command from the project folder.

$ composer test

Contributing

Contributions are welcome and will be fully credited. Please see CONTRIBUTING and CONDUCT for details.

Security

If you discover any security related issues, please email nyamsprod@gmail.com instead of using the issue tracker.

Credits

License

The MIT License (MIT). Please see LICENSE for more information.