阿里雲內容安全介面 敏感詞 green scan、圖片 image scan

class AliyunGreen
{
    private $accessKeyId;
    private $accessKeySecret;
    private $url = 'https://green.%s.aliyuncs.com%s';
    private $api;
    private $signatureNonce = '';

    public function __construct($accessKeyId, $accessKeySecret, $area, $api, $signatureNonce)
    {
        $this->accessKeyId = $accessKeyId;
        $this->accessKeySecret = $accessKeySecret;
        $this->api = $api;
        $this->url = \sprintf($this->url, $area, $api);
        $this->signatureNonce = $signatureNonce;
    }

    /**
     * @param string $body
     * @param string $clientInfo
     * @return mixed
     */
    private function setQueryUrl(string $body, string $clientInfo)
    {
        $headers = $this->setHeader($body);

        $str = "POST" . PHP_EOL;
        foreach ($headers as $k => $v) {
            if (strpos($k, 'x-acs') === 0) {
                $str .= $k . ':' . $v . PHP_EOL;
            } else {
                $str .= $v . PHP_EOL;
            }
        }
        if (isset($clientInfo) && $clientInfo != '') {
            $str .= "$this->api?clientInfo=" . $clientInfo;
        } else {
            $str .= $this->api;
        }

        $signature = base64_encode(hash_hmac("sha1", $str, $this->accessKeySecret, true));
        $Authorization = ['Authorization' => "acs $this->accessKeyId:$signature"];

        $httpHeader = array_merge($headers, $Authorization);
        $queryHeader = [];
        foreach ($httpHeader as $k => $v) {
            $queryHeader[] = $k . ':' . $v;
        }
        if (isset($clientInfo) && $clientInfo != '') {
            $this->url = $this->url . '?clientInfo=' . urlencode($clientInfo);
        }

        $res = $this->curl($this->url, true, $body, $queryHeader);
        return json_decode($res, 1);
    }

    /**
     * @param string $body
     * @return array
     */
    private function setHeader(string $body): array
    {
        $headers = [
            'Accept' => 'application/json',
            'Content-MD5' => base64_encode(md5($body, 1)),
            'Content-Type' => 'application/json',
            'Date' => gmdate('D, d M Y H:i:s T', time()), //'Tue, 17 Jan 2017 10:16:36 GMT',注意時區
            'x-acs-version' => '2018-05-09',
            'x-acs-signature-nonce' => $this->signatureNonce == '' ? $this->getSignatureNonce(10) : $this->signatureNonce,
            'x-acs-signature-version' => '1.0',
            'x-acs-signature-method' => 'HMAC-SHA1',
        ];
        ksort($headers);
        return $headers;
    }

    /**
     * @param string $url
     * @param bool $isPost
     * @param $arr
     * @param array $header
     * @return bool|string
     */
    public function curl(string $url, bool $isPost, $arr, array $header)
    {
        try {
            $ch = curl_init();
            if ($ch === false) {
                throw new Exception('failed to initialize');
            }
            if (stripos($url, "https://") !== false) {
                //關閉證照
                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
            }
            if (!empty($header)) {
                curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
                curl_setopt($ch, CURLOPT_HEADER, 0); //返回response頭部資訊
            }
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            //post方式
            if (!empty($isPost)) {
                if (is_array($arr)) {
                    $content = http_build_query($arr); //入參內容
                } else {
                    $content = $arr;
                }
                curl_setopt($ch, CURLOPT_POST, true);
                curl_setopt($ch, CURLOPT_POSTFIELDS, $content); //所傳參
            }

            $sContent = curl_exec($ch);
            if ($sContent === false) {
                throw new Exception(curl_error($ch), curl_errno($ch));
            }
            $aStatus = curl_getinfo($ch);
            curl_close($ch);
            return $sContent;
        } catch (Exception $e) {
            trigger_error(sprintf(
                'Curl failed with error #%d: %s',
                $e->getCode(), $e->getMessage()),
                E_USER_ERROR);
        }
    }

    /**
     * @param int $length
     * @return string
     */
    private function getSignatureNonce(int $length): string
    {
        $str = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $len = strlen($str) - 1;
        $randstr = '';
        for ($i = 0; $i < $length; $i++) {
            $num = mt_rand(0, $len);
            $randstr .= $str[$num];
        }
        return $randstr;
    }

    // 文字稽核
    public function textScan($content)
    {
        $tasks = $this->setQueryUrl($content, '');
        print_r($tasks);
    }

    // 圖片稽核
    public function imageScan($content)
    {
        $tasks = $this->setQueryUrl($content, '');
        print_r($tasks);
    }
}

// 使用方式
$text = new AliyunGreen('id', 'secret', 'cn-beijing', '/green/text/scan',
    '');
$body = '{"scenes": ["antispam"],"tasks": [{"dataId": "cfd33235-71a4-468b-8137-a5ffe323a7e8","content": "本校小額貸款，安全、快捷、方便、無抵押，隨機隨貸，當天放款，上門服務。"}]}';
print_r($text->textScan($body));

$image = new AliyunGreen('id', 'secret', 'cn-shenzhen', '/green/image/scan',
    '');
$body = '{"scenes":["porn"],"tasks":[{"dataId":"test2NInmO$tAON6qYUrtCRgLo-1mwxdi","url":"https://img.alicdn.com/tfs/TB1urBOQFXXXXbMXFXXXXXXXXXX-1442-257.png"}]}';
print_r($image->imageScan($body));

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