1:   2:   3:   4:   5:   6:   7:   8:   9:  10:  11:  12:  13:  14:  15:  16:  17:  18:  19:  20:  21:  22:  23:  24:  25:  26:  27:  28:  29:  30:  31:  32:  33:  34:  35:  36:  37:  38:  39:  40:  41:  42:  43:  44:  45:  46:  47:  48:  49:  50:  51:  52:  53:  54:  55:  56:  57:  58:  59:  60:  61:  62:  63:  64:  65:  66:  67:  68:  69:  70:  71:  72:  73:  74:  75:  76:  77:  78:  79:  80:  81:  82:  83:  84:  85:  86:  87:  88:  89:  90:  91:  92:  93:  94:  95:  96:  97:  98:  99: 100: 101: 102: 103: 104: 105: 106: 107: 108: 109: 110: 111: 112: 113: 114: 115: 116: 117: 118: 119: 120: 121: 122: 123: 124: 125: 126: 127: 128: 129: 130: 131: 132: 133: 134: 135: 136: 

<?php

/**
 * Copyright 2016 LINE Corporation
 *
 * LINE Corporation licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

namespace LINE\LINEBot\HTTPClient;

use LINE\LINEBot\Constant\Meta;
use LINE\LINEBot\Exception\CurlExecutionException;
use LINE\LINEBot\HTTPClient;
use LINE\LINEBot\Response;

/**
 * Class CurlHTTPClient.
 *
 * A HTTPClient that uses cURL.
 *
 * @package LINE\LINEBot\HTTPClient
 */
class CurlHTTPClient implements HTTPClient
{
    /** @var array */
    private $authHeaders;
    /** @var array */
    private $userAgentHeader;

    /**
     * CurlHTTPClient constructor.
     *
     * @param string $channelToken Access token of your channel.
     */
    public function __construct($channelToken)
    {
        $this->authHeaders = [
            "Authorization: Bearer $channelToken",
        ];
        $this->userAgentHeader = [
            'User-Agent: LINE-BotSDK-PHP/' . Meta::VERSION,
        ];
    }

    /**
     * Sends GET request to LINE Messaging API.
     *
     * @param string $url Request URL.
     * @return Response Response of API request.
     */
    public function get($url)
    {
        return $this->sendRequest('GET', $url, [], []);
    }

    /**
     * Sends POST request to LINE Messaging API.
     *
     * @param string $url Request URL.
     * @param array $data Request body.
     * @return Response Response of API request.
     */
    public function post($url, array $data)
    {
        return $this->sendRequest('POST', $url, ['Content-Type: application/json; charset=utf-8'], $data);
    }

    /**
     * @param string $method
     * @param string $url
     * @param array $additionalHeader
     * @param array $reqBody
     * @return Response
     * @throws CurlExecutionException
     */
    private function sendRequest($method, $url, array $additionalHeader, array $reqBody)
    {
        $curl = new Curl($url);

        $headers = array_merge($this->authHeaders, $this->userAgentHeader, $additionalHeader);

        $options = [
            CURLOPT_CUSTOMREQUEST => $method,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_BINARYTRANSFER => true,
            CURLOPT_HEADER => true,
        ];

        if ($method === 'POST') {
            if (empty($reqBody)) {
                // Rel: https://github.com/line/line-bot-sdk-php/issues/35
                $options[CURLOPT_HTTPHEADER][] = 'Content-Length: 0';
            } else {
                $options[CURLOPT_POSTFIELDS] = json_encode($reqBody);
            }
        }

        $curl->setoptArray($options);

        $result = $curl->exec();

        if ($curl->errno()) {
            throw new CurlExecutionException($curl->error());
        }

        $info = $curl->getinfo();
        $httpStatus = $info['http_code'];

        $responseHeaderSize = $info['header_size'];

        $responseHeaderStr = substr($result, 0, $responseHeaderSize);
        $responseHeaders = [];
        foreach (explode("\r\n", $responseHeaderStr) as $responseHeader) {
            $kv = explode(':', $responseHeader, 2);
            if (count($kv) === 2) {
                $responseHeaders[$kv[0]] = trim($kv[1]);
            }
        }

        $body = substr($result, $responseHeaderSize);

        return new Response($httpStatus, $body, $responseHeaders);
    }
}