【AWS SDK PHP】This operation requests `sigv4a` auth schemes 问题处理

使用AWS SDK碰到的错误，其实很简单，要装个扩展库

保持如下

Fatal error: Uncaught Aws\Auth\Exception\UnresolvedAuthSchemeException: This operation requests `sigv4a` auth schemes, but the client currently supports `sigv4`, `none`, `bearer`, `sigv4-s3express`. in /var/www/html/easymonitor/awstool/aws-sdk-php-v3/Aws/EndpointV2/EndpointV2Middleware.php on line 323

根据提示可以看到如下代码

    private function resolveAuthScheme(array $authSchemes): array
    {
        $invalidAuthSchemes = [];

        foreach($authSchemes as $authScheme) {
            if ($this->isValidAuthScheme($authScheme['name'])) {
                return $this->normalizeAuthScheme($authScheme);
            }
            $invalidAuthSchemes[$authScheme['name']] = false;
        }
  		.......省略.......
        throw new UnresolvedAuthSchemeException(
            "This operation requests {$invalidAuthSchemesString}"
            . " auth schemes, but the client currently supports {$validAuthSchemesString}."
        );
    }

这里就是判断用哪种验证方式
在头部可以看到sigv4a是在列表里面的

private static $validAuthSchemes = [
        'sigv4' => 'v4',
        'sigv4a' => 'v4a',
        'none' => 'anonymous',
        'bearer' => 'bearer',
        'sigv4-s3express' => 'v4-s3express'
    ];

这里这个函数isValidAuthScheme就比较可疑

    private function isValidAuthScheme($signatureVersion): bool
    {
        if (isset(self::$validAuthSchemes[$signatureVersion])) {
              if ($signatureVersion === 'sigv4a') {
                  return extension_loaded('awscrt');
              }
              return true;
        }

        return false;
    }

这里可以看到，列表中有的就直接返回true
但sigv4a比较特殊，需要awscrt扩展
用yum搜了一下有现成的，直接装就行了

总结
缺少awscrt扩展，安装就行了

补充说明
装了扩展还是要添加php文件才行，具体见官方项目
https://github.com/awslabs/aws-crt-php