Obtendo autorização do Tumblr com o OAuth.

AppController.php

<?php

namespace App\Http\Controllers;

use Tumblr\API\Client as TumblrClient;
use Illuminate\Http\Request;
use Tumblr\API\RequestException;

use App\Http\Controllers\Controller;

class AppController extends Controller
{
    public function __construct(Request $request)
    {
        $this->request = $request;
    }

    /**
     * Display a authorization view.
     *
     * @return Response
     */
    public function getAuthorize()
    {
        $tumblr = new TumblrClient(
            env('TUMBLR_CONSUMER_KEY'),
            env('TUMBLR_CONSUMER_SECRET')
        );

        $requestHandler = $tumblr->getRequestHandler();
        $requestHandler->setBaseUrl('https://www.tumblr.com');

        $response = $requestHandler->request('POST', 'oauth/request_token', [
            'oauth_callback' => route('app.authorized')
        ]);

        if ($response->status != 200) {
            throw new RequestException($response);
        }

        parse_str((string) $response->body, $tokens);

        foreach (['oauth_token', 'oauth_token_secret'] as $token) {
            $this->request->session()->flash($token, $tokens[$token]);
        }

        return view('app.authorize')->with('oauthToken', $tokens['oauth_token']);
    }

    public function getAuthorized()
    {
        $tumblr = new TumblrClient(
            env('TUMBLR_CONSUMER_KEY'),
            env('TUMBLR_CONSUMER_SECRET'),
            $this->request->session()->get('oauth_token'),
            $this->request->session()->get('oauth_token_secret')
        );

        $requestHandler = $tumblr->getRequestHandler();
        $requestHandler->setBaseUrl('https://www.tumblr.com');

        $response = $requestHandler->request('POST', 'oauth/access_token', [
            'oauth_verifier' => $this->request->input('oauth_verifier')
        ]);

        if ($response->status != 200) {
            return view('app.unauthorized');
        }

        parse_str((string) $response->body, $tokens);

        dd($tokens);
    }
}