MattermostApi.php

<?php

declare(strict_types=1);

/*
 * This file is part of forecast.it.fill project.
 * (c) Patrick Jaja <patrickjajaa@gmail.com>
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace ForecastAutomation\MattermostClient\Business;

use ForecastAutomation\MattermostClient\Shared\Dto\MattermostConfigDto;
use ForecastAutomation\MattermostClient\Shared\Dto\MattermostPostsQueryDto;
use GuzzleHttp\Client;
use GuzzleHttp\Promise\Promise;
use GuzzleHttp\Promise\PromiseInterface;

class MattermostApi
{
    private const AUTH_API = '/api/v4/users/login';
    private const CHANNEL_API = '/api/v4/users/me/teams/%s/channels';
    private const POSTS_API = '/api/v4/channels/%s/posts';

    public static string $token = '';

    public function __construct(private Client $guzzleClient, private MattermostConfigDto $mattermostConfigDto)
    {
    }

    public function getChannel(array $channelFilterCollection): PromiseInterface
    {
        $this->auth();

        $wrapPromise = new Promise(function () use ($channelFilterCollection, &$wrapPromise) {
            $res = $this->guzzleClient->requestAsync(
                'GET',
                sprintf(self::CHANNEL_API, $this->mattermostConfigDto->teamId),
                [
                    'headers' => [
                        'Authorization' => 'Bearer '.static::$token,
                        'Content-Type' => 'application/json',
                    ],
                ]
            )->wait();

            $channelArray = json_decode((string) $res->getBody(), null, JSON_PARTIAL_OUTPUT_ON_ERROR, JSON_THROW_ON_ERROR);
            $wrapPromise->resolve($this->applyChannelFilter($channelArray, $channelFilterCollection));
        });

        return $wrapPromise;
    }

    public function getPosts(MattermostPostsQueryDto $postsQueryDto): PromiseInterface
    {
        $this->auth();

        $wrapPromise = new Promise(function () use ($postsQueryDto, &$wrapPromise) {
            $res = $this->guzzleClient->requestAsync(
                'GET',
                sprintf(self::POSTS_API, $postsQueryDto->channelId),
                [
                    'query' => ['since' => (int) $postsQueryDto->since->format('U') * 1000],
                    'headers' => [
                        'Authorization' => 'Bearer '.static::$token,
                        'Content-Type' => 'application/json',
                    ],
                ],
            )->wait();

            $wrapPromise->resolve(json_decode((string) $res->getBody(), true, JSON_PARTIAL_OUTPUT_ON_ERROR, JSON_THROW_ON_ERROR)['posts']);
        });

        return $wrapPromise;
    }

    private function auth(): string
    {
        if ('' !== static::$token) {
            return static::$token;
        }
        $res = $this->guzzleClient->request(
            'POST',
            self::AUTH_API,
            [
                'body' => json_encode(
                    [
                        'login_id' => $this->mattermostConfigDto->username,
                        'password' => $this->mattermostConfigDto->password,
                    ],
                    JSON_THROW_ON_ERROR
                ),
            ],
        );
        $token = $res->getHeader('token');
        if (0 === \count($token)) {
            throw new \Exception('could not auth to mattermost');
        }
        static::$token = $token[0];

        return static::$token;
    }

    private function applyChannelFilter(
        array $channelArray,
        array $channelFilterCollection
    ): array {
        foreach ($channelFilterCollection as $channelFilter) {
            $channelArray = $channelFilter->apply($channelArray);
        }

        return $channelArray;
    }
}