Utils redirect returns a psr7 ResponseInterface

[Fredthelead]

Hi,

I'm using this library within a project that has psr7 request/response handling. The only problem is that this library redirects within the OneLogin\Saml2\Utils::redirect() method, which breaks the routing flow and bypasses my middlewares. If we simply make this method return a ResponseInterface instead of redirecting, this library becomes really simple to integrate with any project that uses psr7 request/response handling.

• Replaced the redirect logic within this library
• Updated demo1 and demo2 examples

Ref #162

[pitbulk]

Thanks for the effort to contribute this, there was an old ticket: #162 related to psr7, but it never was implemented.

The redirect method (as well as processSLO, login, logout, ) has a $stay parameter that will return the string instead of executing the redirection. I believe that you could use $stay=true instead in your project and then use the result on

return new \GuzzleHttp\Psr7\Response(302, ['location' => [(string) $url]]);

Instead of requiring

"guzzlehttp/guzzle": "^7.3",

I believe you could include it on require-dev, as gonna be used on an example, and then provide a demo3, that will have your demo using psr7 way.