<?php
/**
 * name:API核心类
 * update:2020/12
 * author:xiaoz<xiaoz93@outlook.com>
 * blog:xiaoz.me
 */
//载入通用函数
require("./functions/helper.php");
define("API_URL","https://onenav.xiaoz.top");
class Api {
    protected $db;
    public function __construct($db){
        $this->db = $db;
        //返回json类型
        header('Content-Type:application/json; charset=utf-8');
    }
    /**
     * name:创建分类目录
     */
    public function add_category($token,$name,$property = 0,$weight = 0,$description = '',$font_icon = '',$fid = 0){
        $this->auth($token);
        //分类名称不允许为空
        if( empty($name) ) {
            $this->err_msg(-2000,'分类名称不能为空！');
        }
        $data = [
            'name'          =>  htmlspecialchars($name,ENT_QUOTES),
            'add_time'      =>  time(),
            'weight'        =>  $weight,
            'property'      =>  $property,
            'description'   =>  htmlspecialchars($description,ENT_QUOTES),
            'font_icon'     =>  $font_icon,
            'fid'           =>  $fid
        ];
        //插入分类目录
        $this->db->insert("on_categorys",$data);
        //返回ID
        $id = $this->db->id();
        //如果id为空（NULL），说明插入失败了，姑且认为是name重复导致
        if( empty($id) ){
            $this->err_msg(-1000,'Categorie already exist!');
        }
        else{
            //成功并返回json格式
            $data = [
                'code'      =>  0,
                'id'        =>  intval($id)
            ];
            exit(json_encode($data));
        }
        
    }
    /**
     * 修改分类目录
     * 
     */
    public function edit_category($token,$id,$name,$property = 0,$weight = 0,$description = '',$font_icon = '',$fid = 0){
        $this->auth($token);
        $fid = intval($fid);
        //如果id为空
        if( empty($id) ){
            $this->err_msg(-1003,'The category ID cannot be empty!');
        }
        //根据fid查询这个分类是否存在
        $count = $this->db->count("on_categorys", [
            "id" => $fid
        ]);
        
        //如果fid不是0，且查询结果小于1，则认为这个父级ID是不存在的，则不允许修改
        if( !empty($fid) && ($count < 1) ) {
            $this->err_msg(-2000,'父级ID不存在！');
        }

        //查询fid是否是二级分类的ID，如果是，则不允许修改
        $category = $this->db->get("on_categorys","*",[
            "id"    =>  $fid
        ]);
        //如果查询到他的父ID不是0，则是一个二级分类
        if( intval($category['fid']) !== 0 ) {
            $this->err_msg(-2000,'父分类不能是二级分类!');
        }
        //如果分类名为空
        elseif( empty($name ) ){
            $this->err_msg(-1004,'The category name cannot be empty!');
        }
        //更新数据库
        else{
            //根据分类ID查询改分类下面是否已经存在子分类，如果存在子分类了则不允许设置为子分类，实用情况：一级分类下存在二级分类，无法再将改一级分类修改为二级分类
            $count = $this->db->count("on_categorys", [
                "fid" => $id
            ]);
            //该分类下的子分类数量大于0，并且父级ID修改为其它分类
            if( ( $count > 0 ) && ( $fid !== 0 ) ) {
                $this->err_msg(-2000,'修改失败，该分类下已存在子分类！');
            }
            $data = [
                'name'          =>  htmlspecialchars($name,ENT_QUOTES),
                'up_time'      =>  time(),
                'weight'        =>  $weight,
                'property'      =>  $property,
                'description'   =>  htmlspecialchars($description,ENT_QUOTES),
                'font_icon'     =>  $font_icon,
                'fid'           =>  $fid
            ];
            $re = $this->db->update('on_categorys',$data,[ 'id' => $id]);
            //var_dump( $this->db->log() );
            //获取影响行数
            $row = $re->rowCount();
            if($row) {
                $data = [
                    'code'  =>  0,
                    'msg'   =>  'successful'
                ];
                exit(json_encode($data));
            }
            else{
                $this->err_msg(-1005,'The category name already exists!');
            }
        }
    }
    /**
     * 删除分类目录
     */
    public function del_category($token,$id) {
        //验证授权
        $this->auth($token);
        //如果id为空
        if( empty($id) ){
            $this->err_msg(-1003,'The category ID cannot be empty!');
        }
        //如果分类目录下存在数据
        $count = $this->db->count("on_links", [
            "fid" => $id
        ]);
        //如果分类目录下存在数据，则不允许删除
        if($count > 0) {
            $this->err_msg(-1006,'The category is not empty and cannot be deleted!');
        }
        else{
            $data = $this->db->delete('on_categorys',[ 'id' => $id] );
            //返回影响行数
            $row = $data->rowCount();
            if($row) {
                $data = [
                    'code'  =>  0,
                    'msg'   =>  'successful'
                ];
                exit(json_encode($data));
            }
            else{
                $this->err_msg(-1007,'The category delete failed!');
            }
        }
    }
    
    /**
     * name:返回错误（json）
     * 
     */
    public function err_msg($code,$err_msg){
        $data = [
            'code'      =>  $code,
            'err_msg'   =>  $err_msg
        ];
        //返回json类型
        header('Content-Type:application/json; charset=utf-8');
        exit(json_encode($data));
    }
    /**
     * name:验证方法
     */
    protected function auth($token){
        //计算正确的token：用户名 + TOKEN
        $SecretKey = @$this->db->get('on_options','*',[ 'key'  =>  'SecretKey' ])['value'];
        $token_yes = md5(USER.$SecretKey);
        //获取header中的X-token
        $xtoken = $_SERVER['HTTP_X_TOKEN'];
        if( $xtoken === $token_yes ) {
            return TRUE;
        }
        //如果token为空，则验证cookie
        if(empty($token)) {
            if( !$this->is_login() ) {
                $this->err_msg(-1002,'Authorization failure!');
            }
            else if( $this->is_login() ){
                return TRUE;
            }
            else{
                $this->err_msg(-1002,'Cookie authorization failure!');
            }
        }
        else if ( empty($SecretKey) ) {
            $this->err_msg(-2000,'请先生成SecretKey！');
        }
        else if($token != $token_yes){
            $this->err_msg(-1002,'Authorization failure!');
        }
        else{
            return TRUE;
        }
    }
    /**
     * name:添加链接
     */
    public function add_link($token,$fid,$title,$url,$description = '',$weight = 0,$property = 0,$url_standby = ''){
        $this->auth($token);
        $fid = intval($fid);
        //检测链接是否合法
        //$this->check_link($fid,$title,$url);
        $this->check_link([
            'fid'           =>  $fid,
            'title'         =>  $title,
            'url'           =>  $url,
            'url_standby'   =>  $url_standby
        ]);
        
        //合并数据
        $data = [
            'fid'           =>  $fid,
            'title'         =>  htmlspecialchars($title,ENT_QUOTES),
            'url'           =>  $url,
            'url_standby'   =>  $url_standby,
            'description'   =>  htmlspecialchars($description,ENT_QUOTES),
            'add_time'      =>  time(),
            'weight'        =>  $weight,
            'property'      =>  $property
        ];
        //插入数据库
        $re = $this->db->insert('on_links',$data);
        //返回影响行数
        $row = $re->rowCount();
        //如果为真
        if( $row ){
            $id = $this->db->id();
            $data = [
                'code'      =>  0,
                'id'        =>  $id
            ];
            exit(json_encode($data));
        }
        //如果插入失败
        else{
            $this->err_msg(-1011,'The URL already exists!');
        }
    }
    /**
     * 批量修改链接分类
     */
    public function batch_modify_category($data) {
        $this->auth($token);
        //获取链接ID，是一个数组
        $id = implode(',',$data['id']);
        //获取分类ID
        $fid = $data['fid'];
        //查询分类ID是否存在
        $count = $this->db->count('on_categorys',[ 'id' => $fid]);
        //如果分类ID不存在
        if( empty($fid) || empty($count) ) {
            $this->err_msg(-2000,'分类ID不存在！');
        }
        else{
            $sql = "UPDATE on_links SET fid='$fid' WHERE id IN ($id)";
            $re = $this->db->query($sql);
            if( $re ) {
                $id = $this->db->id();
                $data = [
                    'code'      =>  0,
                    'msg'        =>  "success"
                ];
                exit(json_encode($data));
            }
            else{
                $this->err_msg(-2000,'更新失败！');
            }
        }
    }
    /**
     * 批量修改链接属性为公有或私有
     */
    public function set_link_attribute($data) {
        $this->auth($token);
        //获取链接ID，是一个数组
        $ids = implode(',',$data['ids']);
        $property = intval($data['property']);
        //拼接SQL文件
        $sql = "UPDATE on_links SET property = $property WHERE id IN ($ids)";
        $re = $this->db->query($sql);
        //返回影响行数
        $row = $re->rowCount();
        if ( $row > 0 ){
            $this->return_json(200,"success");
        }
        else{
            $this->return_json(-2000,"failed");
        }
    }
    
    /**
     * 批量导入链接
     */
    public function imp_link($token,$filename,$fid,$property = 0){
        //过滤$filename
        $filename = str_replace('../','',$filename);
        $filename = str_replace('./','',$filename);
        $this->auth($token);
        //检查文件是否存在
        if ( !file_exists($filename) ) {
            $this->err_msg(-1016,'File does not exist!');
        }
        //解析HTML数据
        $content = file_get_contents($filename);

        $pattern = "/<A.*<\/A>/i";

        preg_match_all($pattern,$content,$arr);
        //失败次数
        $fail = 0;
        //成功次数
        $success = 0;
        //总数
        $total = count($arr[0]);
        foreach( $arr[0] as $link )
        {
            $pattern = "/http.*\"? ADD_DATE/i";
            preg_match($pattern,$link,$urls);
            $url = str_replace('" ADD_DATE','',$urls[0]);
            $pattern = "/>.*<\/a>$/i";
            preg_match($pattern,$link,$titles);
            
            $title = str_replace('>','',$titles[0]);
            $title = str_replace('</A','',$title);
            
            //如果标题或者链接为空，则不导入
            if( ($title == '') || ($url == '') ) {
                $fail++;
                continue;
            }
            $data = [
                'fid'           =>  $fid,
                'description'   =>  '',
                'add_time'      =>  time(),
                'weight'        =>  0,
                'property'      =>  $property
            ];
            $data['title'] = $title;
            $data['url']    = $url;
            
            //插入数据库
            $re = $this->db->insert('on_links',$data);
            //返回影响行数
            $row = $re->rowCount();
            //如果为真
            if( $row ){
                $id = $this->db->id();
                $data = [
                    'code'      =>  0,
                    'id'        =>  $id
                ];
                $success++;
                
            }
            //如果插入失败
            else{
                $fail++;
            }
        }
        //删除书签
        unlink($filename);
        $data = [
            'code'      =>  0,
            'msg'       =>  '总数：'.$total.' 成功：'.$success.' 失败：'.$fail
        ];
        exit(json_encode($data));
    }
    /**
     * 批量导入链接并自动创建分类，这是新的导入接口
     */
    public function import_link($filename,$property = 0) {
        //过滤$filename
        $filename = str_replace('../','',$filename);
        $filename = str_replace('./','',$filename);
        $this->auth($token);
        //检查文件是否存在
        if ( !file_exists($filename) ) {
            $this->err_msg(-1016,'File does not exist!');
        }
        //解析HTML数据
        $content = file_get_contents($filename);
        $HTMLs = explode("\n",$content);//分割文本
        $data = []; //链接组
        $categorys = []; //分类信息组
        $categoryt = []; //分类信息表

        // 遍历HTML
        foreach( $HTMLs as $HTMLh ){
            //匹配分类名称
            if( preg_match("/<DT><H3.+>(.*)<\/H3>/i",$HTMLh,$category) ){
                //匹配到文件夹名时加入数组
                array_push($categoryt,$category[1]);
                array_push($categorys,$category[1]);
            }elseif( preg_match('/<\/DL><p>/i',$HTMLh) ){
                //匹配到文件夹结束标记时删除一个
                array_pop($categorys);
            }elseif( preg_match('/<DT><A HREF="(.+)" ADD_DAT.+>(.+)<\/A>/i',$HTMLh,$urls) ){
                $datat['category'] =  $categorys[count($categorys) -1];
                $datat['title'] = $urls[2];
                $datat['url'] = $urls[1];
                array_push($data,$datat);
            }
        }
        $categoryt = array_unique($categoryt);
        //追加一个默认分类，用来存储部分链接找不到分类的情况
        array_push($categoryt,"默认分类");
        
        
        //批量创建分类
        $this->batch_create_category($categoryt);
        //查询所有分类
        $categorys = $this->db->select("on_categorys",[
            "name",
            "id",
            "fid"
        ]);
        // var_dump($categorys);
        // exit;
        //链接计数
        $i = 0;
        //统计链接总数
        $count = count($data);
        //批量导入链接
        foreach ($data as $key => $value) {
            $category_name = trim($value['category']);
            //如果链接的分类是空的，则设置为默认分类
            $category_name = empty( $category_name ) ? "默认分类" : $category_name;
            
            foreach ($categorys as $category) {
                if( trim( $category['name'] ) == $category_name ) {
                    $fid = intval($category['id']);
                    break;
                }
            }
            
            //合并数据
            $link_data = [
                'fid'           =>  $fid,
                'title'         =>  htmlspecialchars($value['title']),
                'url'           =>  htmlspecialchars($value['url'],ENT_QUOTES),
                'add_time'      =>  time(),
                'weight'        =>  0,
                'property'      =>  $property
            ];
            
            //插入数据库
            $re = $this->db->insert('on_links',$link_data);
            //返回影响行数
            $row = $re->rowCount();
            if ($row) {
                $i++;
            }
        }
        //删除书签文件
        unlink($filename);
        $this->return_json(200,"success",[
            "count"     =>  $count,
            "success"   =>  $i,
            "failed"    =>  $count - $i
        ]);

    }
    /**
     * 批量创建分类
     * 接收一个一维数组
     */
    protected function batch_create_category($category_name) {
        $i = 0;
        foreach ($category_name as $key => $value) {
            $value = empty($value) ? "默认分类" : $value;
            $data = [
                'name'          =>  trim($value),
                'add_time'      =>  time(),
                'weight'        =>  0,
                'property'      =>  1,
                'description'   =>  "书签导入时自动创建",
                'fid'           =>  0
            ];
            try {
                //插入分类目录
                $this->db->insert("on_categorys",$data);
                $i++;
            } catch (\Throwable $th) {
                continue;
            }
            
        }
        return $i;
    }

    /**
     * 书签上传
     * type:上传类型，默认为上传书签，后续类型保留使用
     */
    public function upload($token,$type){
        $this->auth($token);
        if ($_FILES["file"]["error"] > 0)
        {
            $this->err_msg(-1015,'File upload failed!');
        }
        else
        {
            $filename = $_FILES["file"]["name"];
            //获取文件后缀
            $suffix = explode('.',$filename);
            $suffix = strtolower(end($suffix));
            
            //临时文件位置
            $temp = $_FILES["file"]["tmp_name"];
            if( $suffix != 'html' ) {
                //删除临时文件
                unlink($filename);
                $this->err_msg(-1014,'Unsupported file suffix name!');
            }
            
            if( copy($temp,'data/'.$filename) ) {
                $data = [
                    'code'      =>  0,
                    'file_name' =>  'data/'.$filename
                ];
                exit(json_encode($data));
            }
        }
    }
    /**
     * 导出HTML链接进行备份
     */
    public function export_link(){
        //鉴权
        $this->auth($token);
        //查询所有分类
        $categorys = $this->db->select("on_categorys","*");
        
        //定义一个空数组用来存储查询后的数据
        $data = [];
        
        //遍历分类
        foreach ($categorys as $key => $category) {
            //查询该分类下的所有链接
            $links = $this->db->select("on_links","*",[
                "fid"      =>  $category['id']
            ]);
            // echo $category['name'];
            // var_dump($links);
            // exit;
            //组合为一个一维数组
            
            $arr[$category['name']] = $links;
            // var_dump();
            // exit;
            $data[$category['name']] = $arr[$category['name']];
            
            //清除临时数据
            unset($arr);
        }
        //返回数据
        return $data;
    }
    /**
     * name:修改链接
     */
    public function edit_link($token,$id,$fid,$title,$url,$description = '',$weight = 0,$property = 0,$url_standby = ''){
        $this->auth($token);
        $fid = intval($fid);
        //检测链接是否合法
        //$this->check_link($fid,$title,$url);
        $this->check_link([
            'fid'           =>  $fid,
            'title'         =>  htmlspecialchars($title,ENT_QUOTES),
            'url'           =>  $url,
            'url_standby'   =>  $url_standby
        ]);
        //查询ID是否存在
        $count = $this->db->count('on_links',[ 'id' => $id]);
        //如果id不存在
        if( (empty($id)) || ($count == false) ) {
            $this->err_msg(-1012,'link id not exists!');
        }
        //合并数据
        $data = [
            'fid'           =>  $fid,
            'title'         =>  htmlspecialchars($title,ENT_QUOTES),
            'url'           =>  $url,
            'url_standby'   =>  $url_standby,
            'description'   =>  htmlspecialchars($description,ENT_QUOTES),
            'up_time'       =>  time(),
            'weight'        =>  $weight,
            'property'      =>  $property
        ];
        //插入数据库
        $re = $this->db->update('on_links',$data,[ 'id' => $id]);
        //返回影响行数
        $row = $re->rowCount();
        //如果为真
        if( $row ){
            $id = $this->db->id();
            $data = [
                'code'      =>  0,
                'msg'        =>  'successful'
            ];
            exit(json_encode($data));
        }
        //如果插入失败
        else{
            $this->err_msg(-1011,'The URL already exists!');
        }
    }
    
    /**
     * 删除链接
     */
    public function del_link($token,$id){
        //验证token是否合法
        $this->auth($token);
        //查询ID是否存在
        $count = $this->db->count('on_links',[ 'id' => $id]);
        //如果id不存在
        if( (empty($id)) || ($count == false) ) {
            $this->err_msg(-1010,'link id not exists!');
        }
        else{
            $re = $this->db->delete('on_links',[ 'id' =>  $id] );
            if($re) {
                $data = [
                    'code'  =>  0,
                    'msg'   =>  'successful'
                ];
                exit(json_encode($data));
            }
            else{
                $this->err_msg(-1010,'link id not exists!');
            }
        }
    }
    /**
     * 验证链接合法性
     * 接收一个数组作为参数
     */
    protected function check_link($data){
        $fid = $data['fid'];
        $title = $data['title'];
        $url = $data['url'];
        $url_standby = @$data['url_standby'];

        //如果父及（分类）ID不存在
        if( empty($fid )) {
            $this->err_msg(-1007,'The category id(fid) not exist!');
        }
        //如果父及ID不存在数据库中
        //验证分类目录是否存在
        $count = $this->db->count("on_categorys", [
            "id" => $fid
        ]);
        if ( empty($count) ){
            $this->err_msg(-1007,'The category not exist!');
        }
        //如果链接标题为空
        if( empty($title) ){
            $this->err_msg(-1008,'The title cannot be empty!');
        }
        //链接不能为空
        if( empty($url) ){
            $this->err_msg(-1009,'URL cannot be empty!');
        }
        //通过正则匹配链接是否合法，支持http/https/ftp/magnet:?|ed2k|tcp/udp/thunder/rtsp/rtmp/sftp
        $pattern = "/^(http:\/\/|https:\/\/|ftp:\/\/|ftps:\/\/|magnet:?|ed2k:\/\/|tcp:\/\/|udp:\/\/|thunder:\/\/|rtsp:\/\/|rtmp:\/\/|sftp:\/\/).+/";
        // if( !filter_var($url, FILTER_VALIDATE_URL) ) {
        //     $this->err_msg(-1010,'URL is not valid!');
        // }
        if ( !preg_match($pattern,$url) ) {
            $this->err_msg(-1010,'URL is not valid!');
        }
        //备用链接不合法
        if ( ( !empty($url_standby) ) && ( !preg_match($pattern, $url_standby) ) ) {
            $this->err_msg(-1010,'URL is not valid!');
        }
        return true;
    }
    /**
     * 查询分类目录
     */
    public function category_list($page,$limit){
        $token = @$_POST['token'];
        $offset = ($page - 1) * $limit;
        /**
         * name:如果成功登录，则查询所有
         * 
         */

        //如果使用cookie登录成功，或者token不为空，则使用token进行验证
        if( $this->is_login() || ( !empty($token) && $this->auth($token) ) ){
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = a.fid LIMIT 1) AS fname FROM on_categorys as a ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
            //统计总数
            $count = $this->db->count('on_categorys','*');
        }
        //如果存在token，则验证
        else if( !empty($token) ) {
            $this->auth($token);
            //查询所有分类
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = a.fid LIMIT 1) AS fname FROM on_categorys as a ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
            //统计总数
            $count = $this->db->count('on_categorys','*');
        }
        else{
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = a.fid LIMIT 1) AS fname FROM on_categorys as a WHERE property = 0 ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
            //统计总数
            $count = $this->db->count('on_categorys','*',[
                "property"      =>  0
            ]);
        }
        
        //原生查询
        $datas = $this->db->query($sql)->fetchAll();
        $datas = [
            'code'      =>  0,
            'msg'       =>  '',
            'count'     =>  $count,
            'data'      =>  $datas
        ];
        exit(json_encode($datas));
    }
    /**
     * 生成
     */
    public function create_sk() {
        //验证是否登录
        $this->auth('');
        $sk = md5(USER.USER.time());
        
        $result = $this->set_option_bool('SecretKey',$sk);
        if( $result ){
            $datas = [
                'code'      =>  0,
                'data'      =>  $sk
            ];
            exit(json_encode($datas));
        }
        else{
            $this->err_msg(-2000,'SecretKey生成失败！');
        }
        
    }
    /**
     * 查询链接
     * 接收一个数组作为参数
     */
    public function link_list($data){
        $limit = $data['limit'];
        $token = $data['token'];
        $offset = ($data['page'] - 1) * $data['limit'];
        //$fid = @$data['category_id'];
        $count = $this->db->count('on_links','*');
        
        //如果成功登录，但token为空，获取所有
        if( ($this->is_login()) && (empty($token)) ){
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name FROM on_links ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }
        
        //如果token验证通过
        elseif( (!empty($token)) && ($this->auth($token)) ) {
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name FROM on_links ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }

        //如果通过header传递的token验证成功，则获取所有
        else if( $this->auth("") === TRUE ) {
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name FROM on_links ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }
        //如果即没有登录成功，又没有token，则默认为游客,游客查询链接属性为公有，分类为公有，不查询私有
        else{
            $c_sql = "SELECT COUNT(*) AS num FROM on_links WHERE property = 0 AND fid IN (SELECT id FROM on_categorys WHERE property = 0)";
            $count = $this->db->query($c_sql)->fetchAll()[0]['num'];
            $count = intval($count);
            
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name FROM on_links WHERE property = 0 AND fid IN (SELECT id FROM on_categorys WHERE property = 0) ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }

       
        //原生查询
        $datas = $this->db->query($sql)->fetchAll();
        $datas = [
            'code'      =>  0,
            'msg'       =>  '',
            'count'     =>  $count,
            'data'      =>  $datas
        ];
        exit(json_encode($datas));
    }
    /**
     * 查询某个分类下面的链接
     * 接收一个数组作为参数
     */
    public function q_category_link($data){
        $limit = $data['limit'];
        $token = $data['token'];
        $offset = ($data['page'] - 1) * $data['limit'];
        $fid = @$data['category_id'];
        //$fid = @$data['category_id'];
        $count = $this->db->count('on_links','*',[
            'fid'   =>  $fid
        ]);

        //如果FID是空的，则直接终止
        if( empty($fid) ) {
            $datas = [
                'code'      =>  -2000,
                'msg'       =>  '分类ID不能为空！',
                'count'     =>  0,
                'data'      =>  []
            ];
            exit(json_encode($datas));
        }
        
        //如果成功登录，但token为空
        if( ($this->is_login()) && (empty($token)) ){
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name  FROM on_links WHERE fid = $fid ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }
        //通过header获取token成功
        else if( $this->auth("") ) {
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name  FROM on_links WHERE fid = $fid ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }
        
        //如果token验证通过
        elseif( (!empty($token)) && ($this->auth($token)) ) {
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name FROM on_links WHERE fid = $fid ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }
        //如果即没有登录成功，又没有token，则默认为游客,游客查询链接属性为公有，分类为公有，不查询私有
        else{
            $c_sql = "SELECT COUNT(*) AS num FROM on_links WHERE property = 0 AND fid = $fid";
            $count = $this->db->query($c_sql)->fetchAll()[0]['num'];
            $count = intval($count);
            
            $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_links.fid) AS category_name FROM on_links WHERE property = 0 AND fid = $fid ORDER BY weight DESC,id DESC LIMIT {$limit} OFFSET {$offset}";
        }

       
        //原生查询
        $datas = $this->db->query($sql)->fetchAll();
        $datas = [
            'code'      =>  0,
            'msg'       =>  '',
            'count'     =>  $count,
            'data'      =>  $datas
        ];
        exit(json_encode($datas));
    }
    /**
     * 查询单个链接
     * 此函数接收一个数组
     */
    public function get_a_link($data) {
        $id = $data['id'];
        $token = $data['token'];
        $link_info = $this->db->get("on_links","*",[
            "id"    =>  $id
        ]);
        //打印链接信息
        //var_dump($link_info);
        //如果是公开链接，则直接返回
        if ( $link_info['property'] == "0" ) {
            //链接是公开的，但是分类是私有的，则不显示
            $category_property = $this->db->get("on_categorys","property",[
                "id"    =>  $link_info['fid']
            ]);
            $category_property = intval($category_property);
            //分类属性为1，则说明是私有链接，则未认证用户不允许查询
            if( $category_property === 1 ){
                //进行认证
                $this->auth($token);
            }
            $datas = [
                'code'      =>  0,
                'data'      =>  $link_info
            ];
            
        }
        //如果是私有链接，并且认证通过
        elseif( $link_info['property'] == "1" ) {
            if ( ( $this->auth($token) ) || ( $this->is_login() ) ) {
                $datas = [
                    'code'      =>  0,
                    'data'      =>  $link_info
                ];
            }
            
            //exit(json_encode($datas));
        }
        //如果是其它情况，则显示为空
        else{
            $datas = [
                'code'      =>  0,
                'data'      =>  []
            ];
            //exit(json_encode($datas));
        }
        exit(json_encode($datas));
    }
    /**
     * 查询单个分类信息
     * 此函数接收一个数组
     */
    public function get_a_category($data) {
        $id = $data['id'];
        $token = $data['token'];

        $category_info = $this->db->get("on_categorys","*",[
            "id"    =>  $id
        ]);

        //var_dump($category_info);

        //如果是公开分类，则直接返回
        if ( $category_info['property'] == "0" ) {
            $datas = [
                'code'      =>  0,
                'data'      =>  $category_info
            ];
            
        }
        //如果是私有链接，并且认证通过
        elseif( $category_info['property'] == "1" ) {
            if ( ( $this->auth($token) ) || ( $this->is_login() ) ) {
                $datas = [
                    'code'      =>  0,
                    'data'      =>  $category_info
                ];
            }
            
            //exit(json_encode($datas));
        }
        //如果是其它情况，则显示为空
        else{
            $datas = [
                'code'      =>  0,
                'data'      =>  []
            ];
            //exit(json_encode($datas));
        }
        exit(json_encode($datas));
    }
    /**
     * 验证是否登录
     */
    protected function is_login(){
        $key = md5(USER.PASSWORD.'onenav'.$_SERVER['HTTP_USER_AGENT']);
        //获取session
        $session = $_COOKIE['key'];
        //如果已经成功登录
        if($session == $key) {
            return true;
        }
        else{
            return false;
        }
    }
    /**
     * 获取链接信息
     */
    public function get_link_info($token,$url){
        $this->auth($token);
        //检查链接是否合法
        $pattern = "/^(http:\/\/|https:\/\/).*/";
        //链接不合法
        if( empty($url) ) {
            $this->err_msg(-2000,'URL不能为空!');
        }
        if( !preg_match($pattern,$url) ){
            $this->err_msg(-1010,'只支持识别http/https协议的链接!');
        }
        else if( !filter_var($url, FILTER_VALIDATE_URL) ) {
            $this->err_msg(-2000,'只支持识别http/https协议的链接!');
        }
        //获取网站标题
        $c = curl_init(); 
        curl_setopt($c, CURLOPT_URL, $url); 
        curl_setopt($c, CURLOPT_RETURNTRANSFER, 1); 
        curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($c, CURLOPT_SSL_VERIFYHOST, false);
        //设置超时时间
        curl_setopt($c , CURLOPT_TIMEOUT, 10);
        $data = curl_exec($c); 
        curl_close($c); 
        $pos = strpos($data,'utf-8'); 
        if($pos===false){$data = iconv("gbk","utf-8",$data);} 
        preg_match("/<title>(.*)<\/title>/i",$data, $title); 
        
        $link['title'] =  $title[1]; 

        //获取网站描述
        $tags = get_meta_tags($url);
        $link['description'] = $tags['description'];
        
        $data = [
            'code'      =>  0,
            'data'      =>  $link
        ];
        exit(json_encode($data));
    }
    /**
     * 自定义js
     */
    public function add_js($token,$content){
        $this->auth($token);
        //如果内容为空
        // if( $content == '' ){
        //     $this->err_msg(-1013,'The content cannot be empty!');
        // }
        //写入文件
        try{
            file_put_contents("data/extend.js",$content);
            $data = [
                'code'      =>  0,
                'data'      =>  'success'
            ];
            exit(json_encode($data));
        }
        catch(Exception $e){
            $this->err_msg(-2000,$e->getMessage());
        }
    }
    /**
     * 获取IP
     */
    //获取访客IP
    protected function getIP() { 
    if (getenv('HTTP_CLIENT_IP')) { 
    $ip = getenv('HTTP_CLIENT_IP'); 
    } 
    elseif (getenv('HTTP_X_FORWARDED_FOR')) { 
        $ip = getenv('HTTP_X_FORWARDED_FOR'); 
    } 
        elseif (getenv('HTTP_X_FORWARDED')) { 
        $ip = getenv('HTTP_X_FORWARDED'); 
    } 
    elseif (getenv('HTTP_FORWARDED_FOR')) { 
    $ip = getenv('HTTP_FORWARDED_FOR'); 
    } 
    elseif (getenv('HTTP_FORWARDED')) { 
    $ip = getenv('HTTP_FORWARDED'); 
    } 
    else { 
        $ip = $_SERVER['REMOTE_ADDR']; 
    } 
        return $ip; 
    } 

    /**
     * name:检查弱密码
     */
    public function check_weak_password($token){
        $this->auth($token);
        //如果用户名、密码为初始密码，则提示修改
        if ( ( USER == 'xiaoz' ) && ( PASSWORD == 'xiaoz.me' ) ) {
            $this->err_msg(-1,'Weak password!');
        }
    }
    /**
     * 获取SQL更新列表
     * 循环读取db/sql/目录下的.sql文件
     */
    public function get_sql_update_list($data) {
        //鉴权
        if( !$this->is_login() ) {
            $this->err_msg(-1002,'Authorization failure!');
        }
        //待更新的数据库文件目录
        $sql_dir = 'db/sql/';
        //待更新的sql文件列表，默认为空
        $sql_files_all = [];
        //打开一个目录，读取里面的文件列表
        if (is_dir($sql_dir)){
            if ($dh = opendir($sql_dir)){
                while (($file = readdir($dh)) !== false){
                //排除.和..
                if ( ($file != ".") && ($file != "..") ) {
                    array_push($sql_files_all,$file);

                }
            }
                //关闭句柄
                closedir($dh);
            }
        }
        //判断数据库日志表是否存在
        $sql = "SELECT count(*) AS num FROM sqlite_master WHERE type='table' AND name='on_db_logs'";
        //查询结果
        $q_result = $this->db->query($sql)->fetchAll();
        //如果数量为0，则说明on_db_logs这个表不存在，需要提前导入
        $num = intval($q_result[0]['num']);
        if ( $num === 0 ) {
            $data = [
                "code"      =>  0,
                "data"      =>  ['on_db_logs.sql']
            ];
            exit(json_encode($data));
        }else{
            //如果不为0，则需要查询数据库更新表里面的数据进行差集比对
            $get_on_db_logs = $this->db->select("on_db_logs",[
                "sql_name"
            ],[
                "status"    =>  "TRUE"
            ]);
            //声明一个空数组，存储已更新的数据库列表
            $already_dbs = [];
            foreach ($get_on_db_logs as $value) {
                array_push($already_dbs,$value['sql_name']);
            }
            
            //array_diff() 函数返回两个数组的差集数组
            $diff_result = array_diff($sql_files_all,$already_dbs);
            //去掉键
            $diff_result = array_values($diff_result);
            sort($diff_result);
            
            $data = [
                "code"      =>  0,
                "data"      =>  $diff_result
            ];
            exit(json_encode($data));
        }

    }
    /**
     * 执行SQL更新语句，只执行单条更新
     */
    public function exe_sql($data) {
        //鉴权
        if( !$this->is_login() ) {
            $this->err_msg(-1002,'Authorization failure!');
        }
        //数据库sql目录
        $sql_dir = 'db/sql/';
        $name = $data['name'];
        //查询sql是否已经执行过
        $count = $this->db->count("on_db_logs",[
            "sql_name"  =>  $name
        ]);
        if( $count >= 1 ) {
            $this->err_msg(-2000,$name."已经更新过！");
        }
        $sql_name = $sql_dir.$name;
        //如果文件不存在，直接返回错误
        if ( !file_exists($sql_name) ) {
            $this->err_msg(-2000,$name.'不存在!');
        }
        //读取需要更新的SQL内容
        try {
            //读取一个SQL文件，并将单个SQL文件拆分成单条SQL语句循环执行
            switch ($name) {
                case '20220414.sql':
                    $sql_content = explode("\n",file_get_contents($sql_name));
                    break;
                default:
                    $sql_content = explode(';',file_get_contents($sql_name));
                    break;
            }
            
            //计算SQL总数
            $num = count($sql_content) - 1;
            //初始数量设置为0
            $init_num = 0;
            //遍历执行SQL语句
            foreach ($sql_content as $sql) {
                //如果SQL为空，则跳过此次循环不执行
                if( empty($sql) ) {
                    continue;
                }
                $result = $this->db->query($sql);
                //只要单条SQL执行成功了就增加初始数量
                if( $result ) {
                    $init_num++;
                }
            }

            //无论最后结果如何，都将更新信息写入数据库
            $insert_re = $this->db->insert("on_db_logs",[
                "sql_name"      =>  $name,
                "update_time"   =>  time(),
                "status"        =>  "TRUE"
            ]);
            if( $insert_re ) {
                $data = [
                    "code"      =>  0,
                    "data"      =>  $name."更新完成！总数${num}，成功：${init_num}"
                ];
                exit(json_encode($data));
            }
            else {
                $this->err_msg(-2000,$name."更新失败，请人工检查！");
            }
            
        } catch(Exception $e){
            $this->err_msg(-2000,$e->getMessage());
        }
    }
    /**
     * 保存主题参数
     */
    public function save_theme_config($data) {
        $this->auth($token);
        //获取主题名称
        $name = $data['name'];
        //获取config参数,是一个对象
        $config = $data['config'];
        
        //获取主题配置文件config.json
        if ( is_dir("templates/".$name) ) {
            $config_file = "templates/".$name."/config.json";
        }
        else{
            $config_file = "data/templates/".$name."/config.json";
        }
        
        $config_content = json_encode($config,JSON_UNESCAPED_UNICODE|JSON_PRETTY_PRINT);
        //写入配置
        try {
            $re = @file_put_contents($config_file,$config_content);
            $this->return_json(0,"success");
        } catch (\Throwable $th) {
            $this->err_msg(-2000,"写入配置失败！");
        }
    }
    /**
     * 删除主题
     */
    public function delete_theme($name) {
        //验证授权
        $this->auth($token);
        //正则判断主题名称是否合法
        $pattern = "/^[a-zA-Z0-9][a-zA-Z0-9-_]+[a-zA-Z0-9]$/";
        if ( !preg_match($pattern,$name) ) {
            $this->return_json(-2000,'',"主题名称不合法！");
        }
        //如果是默认主题，则不允许删除
        if( ($name === 'default') || ($name === 'admin') ) {
            $this->return_json(-2000,'',"默认主题不允许删除！");
        }
        //查询当前使用中的主题
        $current_theme = $this->db->get('on_options','value',[ 'key'  =>  "theme" ]);
        //如果是当前使用中的主题也不允许删除
        if ( $current_theme == $name ) {
            $this->return_json(-2000,'',"使用中的主题不允许删除！");
        }
        //删除主题
        $this->deldir("templates/".$name);
        
        $this->deldir("data/templates/".$name);
        //判断主题文件夹是否还存在
        if( is_dir("templates/".$name) || is_dir("data/templates/".$name) ) {
            $this->return_json(-2000,'',"删除失败，可能是权限不足！");
        }
        else{
            $this->return_json(200,'',"主题已删除！");
        }
    }
    /**
     * 删除一个目录
     */
    protected function deldir($dir) {
        //先删除目录下的文件：
        $dh=opendir($dir);
        while ($file=readdir($dh)) {
          if($file!="." && $file!="..") {
            $fullpath=$dir."/".$file;
            if(!is_dir($fullpath)) {
                unlink($fullpath);
            } else {
                $this->deldir($fullpath);
            }
          }
        }
       
        closedir($dh);
        //删除当前文件夹：
        if(rmdir($dir)) {
          return true;
        } else {
          return false;
        }
    }
    /**
     * 获取主题参数
     */
    public function get_theme_config() {
        $template = $this->db->get("on_options","value",[
            "key"   =>  "theme"
        ]);
        //获取主题配置信息
        //获取主题配置
        if( file_exists("templates/".$template."/config.json") ) {
            $config_file = "templates/".$template."/config.json";
        }
        else if( file_exists("data/templates/".$template."/config.json") ) {
            $config_file = "data/templates/".$template."/config.json";
        }
        else if( file_exists("templates/".$template."/info.json") ) {
            $config_file = "templates/".$template."/info.json";
        }
        else {
            $config_file = "data/templates/".$template."/info.json";
        }

        //读取主题配置
        $config_content = @file_get_contents($config_file);
        
        //如果是info.json,则特殊处理下
        if ( strstr($config_file,"info.json") ) {
            $config_content = json_decode($config_content);
            $theme_config = $config_content->config;
        }
        else{
            $theme_config = $config_content;
            $theme_config = json_decode($theme_config);
        }
        
        $this->return_json(200,$theme_config,"");
    }
    /**
     * 通用json消息返回
     */
    public function return_json($code,$data,$msg = "") {
        $return = [
            "code"  =>  intval($code),
            "data"  =>  $data,
            "msg"   =>  $msg
        ];
        exit(json_encode($return));
    }
    /**
     * 更新option
     */
    public function set_option($key,$value = '') {
        $key = htmlspecialchars(trim($key));
        //如果key是空的
        if( empty($key) ) {
            $this->err_msg(-2000,'键不能为空！');
        }
        //鉴权
        if( !$this->is_login() ) {
            $this->err_msg(-1002,'Authorization failure!');
        }

        $count = $this->db->count("on_options", [
            "key" => $key
        ]);
        
        //如果数量是0，则插入，否则就是更新
        if( $count === 0 ) {
            try {
                $this->db->insert("on_options",[
                    "key"   =>  $key,
                    "value" =>  $value
                ]);
                $data = [
                    "code"      =>  0,
                    "data"      =>  "设置成功！"
                ];
                exit(json_encode($data));
            } catch (\Throwable $th) {
                $this->err_msg(-2000,$th);
            }
        }
        //更新数据
        else if( $count === 1 ) {
            try {
                $this->db->update("on_options",[
                    "value"     =>  $value
                ],[
                    "key"       =>  $key
                ]);
                $data = [
                    "code"      =>  0,
                    "data"      =>  "设置已更新！"
                ];
                exit(json_encode($data));
            } catch (\Throwable $th) {
                $this->err_msg(-2000,$th);
            }
        }

    }
    /**
     * 更新option，返回BOOL值
     */
    protected function set_option_bool($key,$value = '') {
        $key = htmlspecialchars(trim($key));
        //如果key是空的
        if( empty($key) ) {
            return FALSE;
        }

        $count = $this->db->count("on_options", [
            "key" => $key
        ]);
        
        //如果数量是0，则插入，否则就是更新
        if( $count === 0 ) {
            try {
                $this->db->insert("on_options",[
                    "key"   =>  $key,
                    "value" =>  $value
                ]);
                $data = [
                    "code"      =>  0,
                    "data"      =>  "设置成功！"
                ];
                return TRUE;
            } catch (\Throwable $th) {
                return FALSE;
            }
        }
        //更新数据
        else if( $count === 1 ) {
            try {
                $this->db->update("on_options",[
                    "value"     =>  $value
                ],[
                    "key"       =>  $key
                ]);
                $data = [
                    "code"      =>  0,
                    "data"      =>  "设置已更新！"
                ];
                return TRUE;
            } catch (\Throwable $th) {
                return FALSE;
            }
        }

    }
    /**
     * 用户状态
     */
    public function check_login($token){
        $re = $this->auth($token);
        
        if( $re ) {
            $this->return_json(200,"true","success");
        }
    }
    /**
     * 验证订阅是否有效
     */
    public function check_subscribe() {
        //验证token是否合法
        $this->auth($token);
        //获取订阅信息
        //获取当前站点信息
        $subscribe = $this->db->get('on_options','value',[ 'key'  =>  "s_subscribe" ]);
        $domain = $_SERVER['HTTP_HOST'];
    
        $subscribe = unserialize($subscribe);
        //api请求地址
        $api_url = API_URL."/v1/check_subscribe.php?order_id=".$subscribe['order_id']."&email=".$subscribe['email']."&domain=".$domain;
        
        try {
            #GET HTTPS
            $curl = curl_init($api_url);
            #设置useragent
            curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36");
            curl_setopt($curl, CURLOPT_FAILONERROR, true);
            curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
            #设置超时时间，最小为1s（可选）
            curl_setopt($curl , CURLOPT_TIMEOUT, 30);

            $html = curl_exec($curl);
            curl_close($curl);
            //解析json
            $data = json_decode($html);
            //var_dump($data->data->end_time);
            //echo strtotime($data->data->end_time);
            //var_dump($data->code);
            //如果状态码返回200，并且订阅没有到期
            if( (intval($data->code) === 200) && ( $data->data->end_time > ( strtotime( date("Y-m-d",time()) ) )) ) {
                $this->return_json(200,$data->data,'success');
            }
            else if( intval($data->code === -1000 ) ) {
                $this->return_json(-2000,'',$data->msg);
            }
            else{
                $this->return_json(-2000,'',"请求接口失败，请重试！");
            }
        } catch (\Throwable $th) {
            $this->return_json(-2000,'','网络请求失败，请重试！');
        }
    }
    /**
     * 下载主题
     */
    public function down_theme($data) {
        //主题名称
        $name = $data['name'];
        //key-value
        $key = $data['key'];
        $value = $data['value'];
        //拼接主题URL
        $url = API_URL."/v1/down_theme.php?name=${name}&key=${key}&value=${value}";
        //验证token是否合法
        $this->auth($token);
        //检查主题是否已经存在
        if ( $data['type'] == 'download' ) {
            $theme1 = "templates/".$name;
            $theme2 = "data/templates/".$name;

            if( is_dir($theme1) || is_dir($theme2) ) {
                $this->return_json(-2000,'','主题已存在，无需重复下载！');
            }
        }
        //如果返回404状态
        $res = get_headers($url,1);
        if( strstr($res[0],'404') ) {
            $this->return_json(-2000,'','远程服务器上不存在此主题！');
        }
        //判断主题目录是否存在,如果curl_host是alpine，则视为容器，容器则将主题目录设置为data/templates
        $curl_host = curl_version()['host'];
        if( strstr($curl_host,'alpine') ) {
            $theme_dir = "data/templates";
        }
        else{
            $theme_dir = "templates";
        }
        //主题完整压缩包路径
        $file_name = $theme_dir."/${name}.tar.gz";
        if( !is_dir($theme_dir) ) {
            mkdir($theme_dir,0755);
        }
        
        //尝试下载主题
        try {
            //下载主题，并设置超时时间为120s
            $content = $this->curl_get($url,120);
            //写入主题
            $re = file_put_contents($theme_dir."/${name}.tar.gz",$content);
            //如果写入主题失败了，说明权限不粗糙
            if( !$re ) {
                $this->return_json(-2000,'','主题写入失败，请检查目录权限！');
            }
            else{
                //解压文件
                $phar = new PharData($file_name);
                //路径 要解压的文件 是否覆盖
                $phar->extractTo($theme_dir."/${name}", null, true);
                //删除主题
                unlink($file_name);
                $this->return_json(200,'','主题下载成功！');
            }

        } catch (\Throwable $th) {
            $this->return_json(-2000,'','主题下载失败，请检查目录权限！');
        }
        finally{
            unlink($file_name);
        }

    }
    /**
     * 验证订阅是否存在
     */
    public function is_subscribe() {
        //获取订阅SESSION状态
        session_start();
        //获取session订阅状态
        $is_subscribe = $_SESSION['subscribe'];
        //如果订阅是空的，则请求接口获取订阅状态
        if ( !isset($is_subscribe) ) {
            //获取当前站点信息
            $subscribe = $this->db->get('on_options','value',[ 'key'  =>  "s_subscribe" ]);
            $domain = $_SERVER['HTTP_HOST'];
        
            $subscribe = unserialize($subscribe);
            //api请求地址
            $api_url = API_URL."/v1/check_subscribe.php?order_id=".$subscribe['order_id']."&email=".$subscribe['email']."&domain=".$domain;
            try {
                #GET HTTPS
                $curl = curl_init($api_url);
                #设置useragent
                curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36");
                curl_setopt($curl, CURLOPT_FAILONERROR, true);
                curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
                curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
                curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
                #设置超时时间，最小为1s（可选）
                curl_setopt($curl , CURLOPT_TIMEOUT, 30);
    
                $html = curl_exec($curl);
                curl_close($curl);
                //解析json
                $data = json_decode($html);
                //var_dump($data->data->end_time);
                //echo strtotime($data->data->end_time);
                //var_dump($data->code);
                //如果状态码返回200，并且订阅没有到期
                if( (intval($data->code) === 200) && ( $data->data->end_time > ( strtotime( date("Y-m-d",time()) ) )) ) {
                    $_SESSION['subscribe'] = TRUE;
                    return TRUE;
                }
                else if( intval($data->code === -1000 ) ) {
                    $_SESSION['subscribe'] = FALSE;
                    return FALSE;
                }
                else{
                    $_SESSION['subscribe'] = NULL;
                }
            } catch (\Throwable $th) {
                $_SESSION['subscribe'] = NULL;
            }
        }
        if( $is_subscribe == TRUE ) {
            return TRUE;
        }
        else{
            return FALSE;
        }
    }
    /**
     * name:验证订阅，订阅不存在，则阻止
     */
    public function check_is_subscribe(){
        $result = $this->is_subscribe();

        if( $result === FALSE ) {
            $this->return_json(-2000,'','该功能需要订阅后才能使用！');
        }
        else if( $result === TRUE ) {
            return TRUE;
        }
        else{
            $this->return_json(-2000,'','该功能需要订阅后才能使用！');
        }
    }
    /**
     * 无脑下载更新程序
     */
    public function down_updater() {
        $url = API_URL."/update.tar.gz";
        // echo $url;
        // exit;
        try {
            //检查本地是否存在更新程序
            $curl = curl_init($url);
            #设置useragent
            curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36");
            curl_setopt($curl, CURLOPT_FAILONERROR, true);
            curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
            #设置超时时间，最小为1s（可选）
            curl_setopt($curl , CURLOPT_TIMEOUT, 60);

            $html = curl_exec($curl);
            curl_close($curl);
            //var_dump($html);
            //return $html;
            //写入文件
            file_put_contents("update.tar.gz",$html);
            //解压覆盖文件
            //解压文件
            $phar = new PharData('update.tar.gz');
            //路径 要解压的文件 是否覆盖
            $phar->extractTo('./', null, true);
            return TRUE;
        } catch (\Throwable $th) {
            $this->return_json(-2000,"","更新程序下载失败！");
        }
        finally{
            //再次判断更新程序是否存在
            if( is_file("update.php") ) {
                //判断是否大约0
                $file_size = filesize("update.php");
                if( $file_size < 100 ) {
                    $this->return_json(-2000,"","更新程序异常，请检查目录权限！");
                }
                else{
                    return TRUE;
                }
            }
            else{
                $this->return_json(-2000,"","更新程序下载失败，请检查目录权限！");
            }
        }
    }
    /**更新升级程序 */
    public function up_updater() {
        
        //如果不存在，则下载更新程序
        if( !is_file("update.php") ) {
            if ( $this->down_updater() ) {
                $this->return_json(200,"","更新程序准备就绪！");
            }

        }
        //如果存在更新程序，验证大小，大小不匹配时进行更新
        if( is_file("update.tar.gz") ) {
            //获取header头
            $header = get_headers(API_URL."/update.tar.gz",1);
            $lentgh = $header['Content-Length'];
            //获取文件大小
            $file_size = filesize("update.tar.gz");
            //如果本地文件大小和远程文件大小不一致，则下载更新
            if ( $file_size != $lentgh ) {
                if ( $this->down_updater() ) {
                    //更新完毕后提示
                    $this->return_json(200,"","更新程序更新完毕！");
                }
                else{
                    $this->return_json(-2000,"","更新程序下载失败，请检查目录权限！");
                }
                
            }
            else {
                $this->return_json(200,"","更新程序（压缩包）准备就绪！");
            }
        }
        else if( is_file("update.php") ) {
            $this->return_json(200,"","更新程序（PHP）准备就绪！");
        }
        else{
            $this->return_json(200,"","更新程序（其它）准备就绪！");
        }
    }
    /**
     * 校验更新程序
     */
    public function check_version($version) {
        //获取当前版本信息
        $current_version = explode("-",file_get_contents("version.txt"));
        $current_version = str_replace("v","",$current_version[0]);

        //获取用户传递的版本
        //$version = $_REQUEST['version'];

        if( $version == $current_version ) {
            $this->return_json(200,"","success");
        }
        else{
            $this->return_json(-2000,"","更新失败，版本校验不匹配，请检查目录权限！");
        }
    }

    //curl get请求
    protected function curl_get($url,$timeout = 10) {
        $curl = curl_init($url);
        #设置useragent
        curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36");
        curl_setopt($curl, CURLOPT_FAILONERROR, true);
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        #设置超时时间，最小为1s（可选）
        curl_setopt($curl , CURLOPT_TIMEOUT, $timeout);

        $html = curl_exec($curl);
        curl_close($curl);
        return $html;
    }

    /**
     * name:数据库备份接口
     */
    public function backup_db(){
        //验证请求
        $this->auth($token);

        //验证订阅
        $this->check_is_subscribe();

        $backup_dir = 'data/backup/';

        //判断目录是否存在，不存在则创建
        if( !is_dir($backup_dir) ) {
            try {
                mkdir($backup_dir,0755);
            } catch (\Throwable $th) {
                $this->return_json(-2000,'','备份目录创建失败，请检查目录权限！');
            }
        }
        //尝试拷贝数据库进行备份
        try {
            //获取当前版本信息
            $current_version = explode("-",file_get_contents("version.txt"));
            $current_version = str_replace("v","",$current_version[0]);
            $db_name = 'onenav_'.date("YmdHi",time()).'_'.$current_version.'.db3';
            $backup_db_path = $backup_dir.$db_name;
            copy('data/onenav.db3',$backup_db_path);
            $this->return_json(200,$db_name,'success');
        } catch (\Throwable $th) {
            $this->return_json(-2000,'','备份目录创建失败，请检查目录权限！');
        }
        
    }
    /**
     * name:数据库备份列表
     */
    public function backup_db_list() {
        //验证请求
        $this->auth($token);
        //验证订阅
        $this->check_is_subscribe();

        //备份目录
        $backup_dir = 'data/backup/';

        //遍历备份列表
        $dbs = scandir($backup_dir);
        $newdbs = $dbs;
        
        //去除.和..
        for ($i=0; $i < count($dbs); $i++) { 
            if( ($dbs[$i] == '.') || ($dbs[$i] == '..') ) {
                unset($newdbs[$i]);
            }
        }

        //将删除后的数组重新赋值
        $dbs = $newdbs;

        //获取备份列表个数
        $num = count($dbs);
        
        //排序处理，按时间从大到小排序
        rsort($dbs,2);

        //如果大于10个，则删减为10个
        if( $num > 10 ) {
            for ($i=$num; $i > 10; $i--) { 
                //物理删除数据库
                unlink($backup_dir.$dbs[$i-1]);
                //删除数组最后一个元素
                array_pop($dbs);
            }
            $count = 10;
        }
        else{
            $count = $num;
        }

        //声明一个空数组
        $data = [];
        //遍历数据库，获取时间，大小
        foreach ($dbs as $key => $value) {
            $arr['id'] = $key;
            $arr['name'] =   $value;
            $arr['mtime'] = date("Y-m-d H:i:s",filemtime($backup_dir.$value));
            $arr['size'] = (filesize($backup_dir.$value) / 1024).'KB';

            $data[$key] = $arr;
        }

        $datas = [
            'code'      =>  0,
            'msg'       =>  '',
            'count'     =>  $count,
            'data'      =>  $data
        ];
        exit(json_encode($datas));
    }
    /**
     * name:删除单个数据库备份
     * @param $name：数据库名称
     */
    public function del_backup_db($name) {
        //验证请求
        $this->auth($token);

        //验证订阅
        $this->check_is_subscribe();

        //使用正则表达式判断数据库名称是否合法
        $pattern = '/^onenav_[0-9\-]+_[0-9.]+(db3)$/';

        if( !preg_match_all($pattern,$name) ) {
            $this->return_json(-2000,'','数据库名称不合法！');
        }

        //数据库目录
        $backup_dir = 'data/backup/';

        //删除数据库
        try {
            unlink($backup_dir.$name);
            $this->return_json(200,'',"备份数据库已被删除！");
        } catch (\Throwable $th) {
            $this->return_json(-2000,'',"删除失败，请检查目录权限！");
        }
    }

    /**
     * name:恢复数据库备份
     * @param $name：备份数据库名称
     */
    public function restore_db($name) {
        //验证请求
        $this->auth($token);

        //验证订阅
        $this->check_is_subscribe();

        //使用正则表达式判断数据库名称是否合法
        $pattern = '/^onenav_[0-9\-]+_[0-9.]+(db3)$/';

        if( !preg_match_all($pattern,$name) ) {
            $this->return_json(-2000,'','数据库名称不合法！');
        }

        //数据库目录
        $backup_dir = 'data/backup/';

        //恢复数据库
        try {
            copy($backup_dir.$name,'data/onenav.db3');
            $this->return_json(200,'','数据库已回滚为'.$name);
        } catch (\Throwable $th) {
            $this->return_json(-2000,'',"回滚失败，请检查目录权限！");
        }
    }

    /**
     * name:获取OneNav信息
     */
    public function app_info($token) {
        //验证请求
        $this->auth($token);
        //获取PHP版本
        $data['php_version'] = PHP_VERSION;
        //获取OneNav版本
        $data['onenav_version'] = file_get_contents("version.txt");
        //获取分类数量
        $data['cat_num'] = $this->db->count("on_categorys");
        //获取链接数量
        $data['link_num'] = $this->db->count("on_links");
        //获取用户名
        $data['username'] = USER;

        //返回JSON数据
        $this->return_json(200,$data,"success");
    }

    /**
     * name:下载数据库
     */
    public function down_db($name) {
        //验证请求
        $this->auth($token);

        //使用正则表达式判断数据库名称是否合法
        $pattern = '/^onenav_[0-9\-]+_[0-9.]+(db3)$/';

        if( !preg_match_all($pattern,$name) ) {
            $this->return_json(-2000,'','数据库名称不合法！');
        }

        //数据库目录
        $backup_dir = 'data/backup/';
        
        //拼接数据库路径
        $full_path = $backup_dir.$name;

        if( !file_exists($full_path) ) {
            header('HTTP/1.1 404 NOT FOUND');
        }
        else{
            // 以只读和二进制模式打开文件
            $file = fopen($full_path, "rb");

            // 告诉浏览器这是一个文件流格式的文件
            Header("Content-type: application/octet-stream");
            // 请求范围的度量单位
            Header("Accept-Ranges: bytes");
            // Content-Length是指定包含于请求或响应中数据的字节长度
            Header("Accept-Length: " . filesize($full_path));
            // 用来告诉浏览器，文件是可以当做附件被下载，下载后的文件名称为$file_name该变量的值。
            Header("Content-Disposition: attachment; filename=" . $name);

            // 读取文件内容并直接输出到浏览器
            echo fread($file, filesize($full_path));
            fclose($file);

            exit();
        }

    }

    /**
     * name:创建分享
     */
    public function create_share($data) {
        //验证请求
        $this->auth($token);

        //如果订阅不存在
        if ( $this->is_subscribe() === FALSE ) {
            $this->return_json(-2000,'','此功能需要订阅后才能使用！');
        }

        //设置默认数据
        //随机8位分享ID
        $data['sid'] = GetRandStr(8);
        
        /**
         * 判断到期时间
         */
        //获取当前时间
        $c_time = strtotime( $data['add_time'] );
        $e_time = strtotime( $data['expire_time'] );

        if( $c_time > $e_time ) {
            $this->return_json(-2000,'','到期日期不能小于当前日期！');
        }

        /**
         * 判断密码
         */
        if( strlen($data['password']) > 16 ) {
            $this->return_json(-2000,'','密码长度不能超过16位！');
        }
        $pattern = "/[A-Za-z0-9]{4,16}/";
        //var_dump(preg_match($pattern,$data['password']));
        if( !empty($data['password']) && !preg_match($pattern,$data['password']) ) {
            $this->return_json(-2000,'','密码只能由4-16位字母和数字组成！');
        }

        //插入数据库
        $result = $this->db->insert("on_shares",$data);

        if( $result ) {
            $this->return_json(200,'','success');
        }
        else{
            $this->return_json(-2000,'','写入数据库失败！');
        }
    }
    /**
     * 分享列表
     */
    public function share_list($data){
        //验证请求
        $this->auth($token);

        $limit = $data['limit'];
        $offset = ($data['page'] - 1) * $data['limit'];
        //$fid = @$data['category_id'];
        $count = $this->db->count('on_shares','*');
        
        $sql = "SELECT *,(SELECT name FROM on_categorys WHERE id = on_shares.cid) AS category_name FROM on_shares ORDER BY id DESC LIMIT {$limit} OFFSET {$offset}";

       
        //原生查询
        $datas = $this->db->query($sql)->fetchAll();

        $datas = [
            'code'      =>  0,
            'msg'       =>  '',
            'count'     =>  $count,
            'data'      =>  $datas
        ];
        exit(json_encode($datas));
    }

    /**
     * name:根据分享的SID查询指定分类下的所有链接
     */
    public function get_sid_links($data) {
        //获得SID
        $sid = $data['sid'];
        //获得密码
        $password = $data['password'];
        //判断SID是否合法
        $pattern = "/[A-Za-z0-9]{8}$/";

        if( (strlen($sid) !== 8) || !preg_match($pattern,$sid) ) {
            $this->return_json(-2000,'','SID不合法！');
        }

        //根据SID查询得到分类ID
        $share_data = $this->db->get("on_shares","*",[
            "sid"   =>  $sid
        ]);

        //如果没有查询到数据
        if( empty($share_data) ) {
            $this->return_json(-2000,'','SID不存在！');
        }

        $cid = $share_data['cid'];

        //查询分类名称
        $category_info = $this->db->get("on_categorys",["name"],[
            "id"    =>  $cid
        ]);
        $category_name = $category_info["name"];

        //如果链接已经过期
        $c_time = strtotime( date("Y-m-d H:i:s",time()) );
        
        if ( $c_time > strtotime($share_data['expire_time']) ) {
            $this->return_json(-2000,'','链接已过期！');
        }
        //如果分享密码不为空，则验证密码
        if ( !empty($share_data['password']) && ( $share_data['password'] ==  $password) ) {
            //根据分类ID（cid）查询该分类下的所有链接
            $results = $this->db->select("on_links","*",[
                "fid"   =>  $cid,
                "ORDER" => ["weight" => "DESC","id" => "DESC"]
            ]);

            $data = [
                "category_name" =>  $category_name,
                "expire_time"   =>  $share_data["expire_time"],
                "results"       =>  $results
            ];

            $this->return_json(200,$data,'success');
        }
        else if ( empty($share_data['password']) ) {
            //根据分类ID（cid）查询该分类下的所有链接
            $results = $this->db->select("on_links","*",[
                "fid"   =>  $cid,
                "ORDER" => ["weight" => "DESC","id" => "DESC"]
            ]);

            $data = [
                "category_name" =>  $category_name,
                "expire_time"   =>  $share_data["expire_time"],
                "results"       =>  $results
            ];

            $this->return_json(200,$data,'success');
        }
        else{
            $this->return_json(401,'','密码错误！');
        }

    }

    /**
     * name：删除分享
     */
    public function del_share($data) {
        //验证请求
        $this->auth($token);

        $id = $data['id'];

        

        //如果id为空
        if( empty($id) ){
            $this->return_json(-2000,$results,'ID不能为空！');
        }

        $data = $this->db->delete('on_shares',[ 'id' => $id] );
        
        if( $data ) {
            $this->return_json(200,'','success');
        }
        else{
            $this->return_json(-2000,'','删除失败！');
        }

    }

    /**
     * name:获取站点信息，不需要授权
     */
    public function site_info() {
        //获取当前站点信息
        $site = $this->db->get('on_options','value',[ 'key'  =>  "s_site" ]);
        $site = unserialize($site);

        $this->return_json(200,$site,'success');
    }
    
}