Why is SessionManager used instead of its Interface?

[dyuk1987]

Summary (*)

I was trying to fix the issue mentioned in #12362, by injecting an updated version of SessionManager to replace the original Magento\Framework\Session\SessionManager, on a Magento 2.2.5. After a while, I managed to find a few exceptions being thrown around by some of the third-party modules I have previously installed. The main problem here is that some of the classes in those modules have directly included "Magento\Framework\Session\SessionManager" in the constructor (instead of Magento\Framework\Session\SessionManagerInterface). I was worried if the replacement would cause similar problems elsewhere in the system, so I have done a few greps to look for classes having the SessionManager directly injected into their constructors, and I managed to find a few of them in the core codepool, namely Paypal\Controller\Transparent\RequestSecureToken and Magento\Framework\View\Context.
I am not quite sure why it is so, but it seems to me the interface should be used instead.

Examples (*)

I don't really have an example here.

Proposed solution

To change Magento\Framework\Session\SessionManager to Magento\Framework\Session\SessionManagerInterface

In

1. Magento/Authorizenet/Model/Directpost/Session.php
2. Magento/Customer/CustomerData/Plugin/SessionChecker.php
3. Magento/Paypal/Controller/Transparent/RequestSecureToken.php
4. lib/internal/Magento/Framework/View/Context.php

[magento-engcom-team]

Hi @dyuk1987. Thank you for your report.
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[magento-engcom-team]

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@engcom-backlog-nazar Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-96481, MAGETWO-96482 were created

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