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DownloadsApi Client

Server-side PHP client for retrieving a list of available downloads from Germania's Downloads API.

Installation

The v5 release is a complete rewrite, so there is no “upgrading” procedure.

$ composer require germania-kg/downloadsapi-client
$ composer require germania-kg/downloadsapi-client:^5.0

This package requires a PSR-18 HTTP client implementation and a PSR-17 HTT factory implementation. Suggestions are Guzzle 7 via guzzlehttp/guzzle and Nyholm's nyholm/psr7 which (despite its name) provides the PSR-17 factories as well:

$ composer require nyholm/psr7
$ composer require guzzlehttp/guzzle

Basics

Interface and abstract class

Interface DownloadsApiInterface provides public methods for retrieving documents, all and latest and request, with the latter for internal use. All of these return an iterable. There are also interceptors for the authentication key:

// Provided by interface 
// Germania\DownloadsApi\DownloadsApiInterface

public function all() : iterable;
public function latest() : iterable;
public function request( string $path ) : iterable ;

public function setAuthentication( ?string $key ) : DownloadsApiInterface;
public function getAuthentication( ) : string;

Abstract class DownloadsApiAbstract prepares the all and latest methods to delegate directly to the request method. It also utilizes various useful traits such as Psr\Log\LoggerAwareTrait, LoglevelTrait and AuthenticationTrait. – So any class extending this abstract will thus provide:

// Inherited from abstract class 
// Germania\DownloadsApi\DownloadsApiAbstract
  
$api->setLogger( \Monolog\Logger( ... ) ); 

$api->setErrorLoglevel( \LogLevel::ERROR );
$api->setSuccessLoglevel( \LogLevel::INFO );

$api->setAuthentication( "secrete" );
$api->getAuthentication(); // "secret"

PSR-6 Cache Support

Class CacheDownloadsApiDecorator wraps an existing DownloadsApi instance and adds support for PSR-6 Caches. It extends DownloadsApiDecorator which itself extends DownloadsApiAbstract, so the class also implements DownloadsApiInterface.

The constructor requires a DownloadsApi (or DownloadsApiInterface) instance and a PSR-6 Cache Item Pool. You may optionally pass a cache lifetime in seconds which defaults to 14400 (4 hours).

<?php
use Germania\DownloadsApi\DownloadsApi;
use Germania\DownloadsApi\CacheDownloadsApiDecorator;
use Symfony\Component\Cache\Adapter\FilesystemAdapter;

$api = new DownloadsApi( ... );
$psr6 = new FilesystemAdapter( ... );

$cached_api = new CacheDownloadsApiDecorator( $api, $psr6);
$cached_api = new CacheDownloadsApiDecorator( $api, $psr6, 14400);

The API client

The DownloadsApi API client extends DownloadsApiAbstract und thus implements DownloadsApiInterface. The constructor requires a PSR-18 HTTP Client, a PSR-17 Request factory and an API key. – To obtain an API key, ask the web developers over at Germania KG.

<?php
use Germania\DownloadsApi\DownloadsApi;
use GuzzleHttp\Client;
use Nyholm\Psr7\Factory\Psr17Factory;

$psr18 = new Client;
$psr17 = new Psr17Factory;
$key = "secret"
  
$api = new DownloadsApi($psr18, $psr17, $key);

Retrieve documents

Public methods all and latest return an Array iterable with the documents provided by Germania's Documents API.

$downloads = $api->latest();
$downloads = $api->all();

foreach( $downloads as $document):
	print_r( $document );
endforeach;

Example record

The above print_r( $document ) will reveal something like this:

Array (
    [company] =>
    [brand] => mybrand
    [title] => Brand<sup>®</sup> Window Styling
    [subtitle] =>
    [subtitle2] =>
    [description] =>
    [picture] => Array (
        [src] =>
        [fallback] =>
    )

    [language] => de
    [download] => https://download.example.com/document.pdf
    [categories] => Array(
        [0] => montageanleitung
    )

    [keywords] => Array ()

    [products] => Array (
        [0] => dachflaechen
        [1] => plissee
        [2] => duette
        [3] => jalousie
        [4] => rollo
    )

    [fileSize] => 2298631
    [lastModified] => Array  (
        [date] => 2018-02-19 10:21:14.000000
        [timezone_type] => 2
        [timezone] => GMT
    )

    [daysAgo] => 420
)

Filtering results

To narrow down the results, both the all and latest methods accept an array with filter values. The fiter values may contain multiple values, separated with comma.

Think of the filter array items as WHERE … AND… clauses, and comma-separated values as 'a' OR 'b'

$filters = array(
  'company' => "ACME",
  'brand'   => "mybrand",
  'category' => "brochure",
  'language' => "en",
  'keyword' => "customers,retailers",
  'product' => "cars,bikes"
);

$downloads = $api->latest($filters);
$downloads = $api->all($filters);

Errors and Exceptions

It should be plenty to watch out for \Germania\DownloadsApi\Exceptions\DownloadsApiExceptionInterface since all concrete exception classes implement this interface.

<?php
use Germania\DownloadsApi\DownloadsApiExceptionInterface;
use Germania\DownloadsApi\DownloadsApiRuntimeException;
use Germania\DownloadsApi\DownloadsApiResponseException;
use Germania\DownloadsApi\DownloadsApiUnexpectedValueException;

try {
  $client->latest();
}
catch (\Germania\DownloadsApi\DownloadsApiExceptionInterface $e) {
	echo $e->getMessage();
}

Exceptions during request: Whenever a PSR-18 client request fails, a DownloadsApiRuntimeException will be thrown. This class implements DownloadsApiExceptionInterface and extends \RuntimeException.

HTTP Error responses: When a API call returns an HTTP error response, a DownloadsApiResponseException will be thrown. This class implements DownloadsApiExceptionInterface and extends \RuntimeException.

Unexpected values in response: Whenever a response (even with status 200 OK) can't be decoded to an useful array, a DownloadsApiUnexpectedValueException will be thrown. This class implements DownloadsApiExceptionInterface and extends \UnexpectedValueException.

Unit tests and development

Copy phpunit.xml.dist to phpunit.xml and fill in the Authentication data you obtained from Germania.

• AUTH_TOKEN when you've got an auth token for the Downloads API at hand.
• Otherwise, fill in AUTH_API, AUTH_USER, and AUTH_PASS . The auth token will then be fetched from Germania's Auth API before each test.

In order to run unit tests, run PhpUnit like this:

$ composer test
# or
$ vendor/bin/phpunit

Issues

See full issues list.