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mutils组件中提供阿里云对象储存(OSS)等操作，该组件不可单独引用至maven依赖。详情请查看AliyunOssUploadFunctions、AliyunOssDownloadFunctions、AliyunOssManageFunctions 官方文档：https://help.aliyun.com/document_detail/32008.html

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package cn.minsin.aliyun.oss;

import cn.minsin.aliyun.oss.config.MutilsAliyunOssMultiProperties;
import cn.minsin.aliyun.oss.config.MutilsAliyunOssProperties;
import cn.minsin.core.exception.MutilsErrorException;
import cn.minsin.core.init.AbstractConfig;
import cn.minsin.core.rule.AbstractFunctionRule;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;

class AliyunOssBaseFunctions extends AbstractFunctionRule {

    private static final MutilsAliyunOssProperties properties;


    static {
        properties = AbstractConfig.loadConfig(MutilsAliyunOssProperties.class);
        checkProperties(properties, MutilsAliyunOssProperties.class);
    }


    protected MutilsAliyunOssMultiProperties childConfig;

    protected AliyunOssBaseFunctions(MutilsAliyunOssMultiProperties config) {
        childConfig = config;
    }

    /**
     * Description: 判断OSS服务文件上传时文件的contentType
     *
     * @param FilenameExtension 文件后缀
     *                          String
     */
    protected static String getContentType(String FilenameExtension) {
        if (FilenameExtension.equalsIgnoreCase(".bmp")) {
            return "image/bmp";
        }
        if (FilenameExtension.equalsIgnoreCase(".gif")) {
            return "image/gif";
        }
        if (FilenameExtension.equalsIgnoreCase(".jpeg") || FilenameExtension.equalsIgnoreCase(".jpg")
                || FilenameExtension.equalsIgnoreCase(".png")) {
            return "image/jpeg";
        }
        if (FilenameExtension.equalsIgnoreCase(".html")) {
            return "text/html";
        }
        if (FilenameExtension.equalsIgnoreCase(".txt")) {
            return "text/plain";
        }
        if (FilenameExtension.equalsIgnoreCase(".vsd")) {
            return "application/vnd.visio";
        }
        if (FilenameExtension.equalsIgnoreCase(".pptx") || FilenameExtension.equalsIgnoreCase(".ppt")) {
            return "application/vnd.ms-powerpoint";
        }
        if (FilenameExtension.equalsIgnoreCase(".docx") || FilenameExtension.equalsIgnoreCase(".doc")) {
            return "application/msword";
        }
        if (FilenameExtension.equalsIgnoreCase(".xml")) {
            return "text/xml";
        }
        return "image/jpeg";
    }

    /**
     * 初始化阿里云 OSS functions
     *
     * @param prefix 配置文件中的前缀
     * @throws MutilsErrorException
     */
    protected static MutilsAliyunOssMultiProperties loadConfig(String prefix) throws MutilsErrorException {
        MutilsAliyunOssMultiProperties aliyunOssMultiConfig = properties.getBucketnameAndSavedir().get(prefix);
        if (aliyunOssMultiConfig == null) {
            throw new MutilsErrorException("The config key named '" + prefix + "' not found, Please check config.");
        }
        return aliyunOssMultiConfig;
    }

    /**
     * 初始化oss客户端
     */
    protected OSS initClient() {
        return new OSSClientBuilder().build(properties.getEndpoint(), properties.getAccessKeyId(), properties.getAccessKeySecret());
    }
}