<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.

/**
 * ActivityPub implementation for GNU social
 *
 * @package   GNUsocial
 * @author    Diogo Cordeiro <diogo@fc.up.pt>
 * @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 * @link      http://www.gnu.org/software/social/
 */

namespace Tests\Unit;

use Tests\TestCase;
use GuzzleHttp\Client;
use GuzzleHttp\Handler\CurlHandler;
use GuzzleHttp\Handler\MockHandler;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Middleware;
use GuzzleHttp\Psr7\Request;
use GuzzleHttp\Psr7\Response;
use HttpSignatures\Context;
use HttpSignatures\GuzzleHttpSignatures;

class HTTPSignatureTest extends TestCase
{
    /**
     * @var Context
     */
    private $context;
    /**
     * @var Client
     */
    private $client;
    /**
     * @var
     */
    private $history = [];

    public function testLibraryInstalled()
    {
        $this->assertTrue(class_exists('\GuzzleHttp\Client'));
        $this->assertTrue(class_exists('\HttpSignatures\Context'));
        $this->assertTrue(class_exists('\HttpSignatures\GuzzleHttpSignatures'));
    }

    public function setUp()
    {
        $this->context = new Context([
            'keys' => ['pda' => 'secret'],
            'algorithm' => 'hmac-sha256',
            'headers' => ['(request-target)', 'date'],
        ]);
        $stack = new HandlerStack();
        $stack->setHandler(new MockHandler([
            new Response(200, ['Content-Length' => 0]),
        ]));
        $stack->push(GuzzleHttpSignatures::middlewareFromContext($this->context));
        $stack->push(Middleware::history($this->history));
        $this->client = new Client(['handler' => $stack]);
    }
    /**
     * test signing a message
     */
    public function testGuzzleRequestHasExpectedHeaders()
    {
        $this->client->get('/path?query=123', [
            'headers' => ['date' => 'today', 'accept' => 'llamas']
        ]);
        // get last request
        $message = end($this->history);
        /** @var Request $request */
        $request = $message['request'];
        /** @var Response $response */
        $response = $message['request'];
        $expectedString = implode(
            ',',
            [
                'keyId="pda"',
                'algorithm="hmac-sha256"',
                'headers="(request-target) date"',
                'signature="SFlytCGpsqb/9qYaKCQklGDvwgmrwfIERFnwt+yqPJw="',
            ]
        );
        $this->assertEquals(
            [$expectedString],
            $request->getHeader('Signature')
        );
        $this->assertEquals(
            ['Signature ' . $expectedString],
            $request->getHeader('Authorization')
        );
    }
    /**
     * test signing a message with a URL that doesn't contain a ?query
     */
    public function testGuzzleRequestHasExpectedHeaders2()
    {
        $this->client->get('/path', [
            'headers' => ['date' => 'today', 'accept' => 'llamas']
        ]);
        // get last request
        $message = end($this->history);
        /** @var Request $request */
        $request = $message['request'];
        /** @var Response $response */
        $response = $message['request'];
        $expectedString = implode(
            ',',
            [
                'keyId="pda"',
                'algorithm="hmac-sha256"',
                'headers="(request-target) date"',
                'signature="DAtF133khP05pS5Gh8f+zF/UF7mVUojMj7iJZO3Xk4o="',
            ]
        );
        $this->assertEquals(
            [$expectedString],
            $request->getHeader('Signature')
        );
        $this->assertEquals(
            ['Signature ' . $expectedString],
            $request->getHeader('Authorization')
        );
    }
    public function getVerifyGuzzleRequestVectors()
    {
        return [
            /* path, headers */
            ['/path?query=123', ['date' => 'today', 'accept' => 'llamas']],
            ['/path?z=zebra&a=antelope', ['date' => 'today']],
        ];
    }
    /**
     * @dataProvider getVerifyGuzzleRequestVectors
     * @param string $path
     * @param array $headers
     */
    public function testVerifyGuzzleRequest($path, $headers)
    {
        $this->client->get($path, ['headers' => $headers]);
        // get last request
        $message = end($this->history);
        /** @var Request $request */
        $request = $message['request'];
        /** @var Response $response */
        $response = $message['request'];
        $this->assertTrue($this->context->verifier()->isValid($request));
    }
}