1 | <?php |
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2 | |||
3 | namespace Omnipay\GoCardless\Message; |
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4 | |||
5 | use Omnipay\Common\Http\ClientInterface; |
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6 | use Omnipay\Common\Message\AbstractRequest; |
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7 | use Symfony\Component\HttpFoundation\Request as HttpRequest; |
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8 | |||
9 | /** |
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10 | * @todo do we want to implement ResponseInterface so we have a getMessage() in case of error? |
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11 | */ |
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12 | class WebhookNotification extends AbstractRequest |
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13 | { |
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14 | /** |
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15 | * @var mixed The data contained in the request. |
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16 | */ |
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17 | protected $data; |
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18 | |||
19 | /** |
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20 | * @inheritDoc |
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21 | */ |
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22 | public function __construct(ClientInterface $httpClient, HttpRequest $httpRequest) |
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23 | { |
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24 | parent::__construct($httpClient, $httpRequest); |
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25 | // fetch POST stream directly |
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26 | $this->data = json_decode($httpRequest->getContent(), true); |
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27 | } |
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28 | |||
29 | /** |
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30 | * @return null|mixed |
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31 | */ |
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32 | public function getData() |
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33 | { |
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34 | return $this->data; |
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35 | } |
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36 | |||
37 | |||
38 | /** |
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39 | * @return array |
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40 | */ |
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41 | public function getNotifications() |
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42 | { |
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43 | if (isset($this->data['events'])) { |
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44 | return $this->data['events']; |
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45 | } |
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46 | return []; |
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47 | } |
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48 | |||
49 | /** |
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50 | * @return null|string |
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51 | */ |
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52 | public function getWebhookId() |
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53 | { |
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54 | if (isset($this->data['meta']['webhook_id'])) { |
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55 | return $this->data['meta']['webhook_id']; |
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56 | } |
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57 | } |
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58 | |||
59 | /** |
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60 | * Given a secret, is the signature on this webhook valid? |
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61 | * |
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62 | * Note: request bodies are minified JSON, so strip superfluous whitespace when testing, including trailing newlines |
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63 | * |
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64 | * @return bool Application should return '498 Token Invalid' if false |
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65 | */ |
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66 | public function hasValidSignature($secret) |
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67 | { |
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68 | $supplied = $this->httpRequest->headers->get('Webhook-Signature'); |
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69 | |||
70 | // DEBUG: strip whitespace from body (minify JSON), including trailing newlines |
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71 | // $rawBody = $this->httpRequest->getContent(); |
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72 | // $minified = json_encode(json_decode($rawBody)); |
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73 | // echo "\nSTART\n{$rawBody}\nSTOP\n"; |
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74 | // echo "\nSTART\n{$minified}\nSTOP\n"; |
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75 | |||
76 | $calculated = hash_hmac('sha256', $this->httpRequest->getContent(), $secret); |
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77 | return $supplied === $calculated; |
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78 | } |
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79 | |||
80 | /** |
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81 | * Implemented as part of {@see AbstractRequest}} for legacy support |
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82 | */ |
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83 | public function sendData($data) |
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84 | { |
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85 | return $this; |
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The expression
return $this returns the type Omnipay\GoCardless\Message\WebhookNotification which is incompatible with the return type mandated by Omnipay\Common\Message\R...stInterface::sendData() of Omnipay\Common\Message\ResponseInterface .
In the issue above, the returned value is violating the contract defined by the mentioned interface. Let's take a look at an example: interface HasName {
/** @return string */
public function getName();
}
class Name {
public $name;
}
class User implements HasName {
/** @return string|Name */
public function getName() {
return new Name('foo'); // This is a violation of the ``HasName`` interface
// which only allows a string value to be returned.
}
}
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86 | } |
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87 | } |
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88 |
Let?s assume that you have a directory layout like this:
and let?s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php
However, as
OtherDir/Foo.php
does not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php
, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: