Uguu/src/Classes/Database.php

<?php

    /**
     * Uguu
     *
     * @copyright Copyright (c) 2022 Go Johansson (nokonoko) <neku@pomf.se>
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU General Public License as published by
     * the Free Software Foundation, either version 3 of the License, or
     * (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program.  If not, see <https://www.gnu.org/licenses/>.
     */

    namespace Pomf\Uguu\Classes;

    use Exception;
    use PDO;

class Database
{
    private PDO $DB;

    /**
     * Sets the value of the DB variable.
     *
     * @param $DB PDO The database connection.
     */
    public function setDB(PDO $DB): void
    {
        $this->DB = $DB;
    }

    /**
     * Checks if a file name exists in the database
     *
     * @param $name string The name of the file.
     *
     * @return int The number of rows that match the query.
     * @throws \Exception
     */
    public function dbCheckNameExists(string $name): int
    {
        try {
            $q = $this->DB->prepare('SELECT COUNT(filename) FROM files WHERE filename = (:name)');
            $q->bindValue(':name', $name);
            $q->execute();
            return $q->fetchColumn();
        } catch (Exception) {
            throw new Exception('Cant check if name exists in DB.', 500);
        }
    }

    /**
     * Checks if the file is blacklisted
     *
     * @param $FILE_INFO array An array containing the following:
     *
     * @throws \Exception
     */
    public function checkFileBlacklist(array $FILE_INFO): void
    {
        try {
            $q = $this->DB->prepare('SELECT hash, COUNT(*) AS count FROM blacklist WHERE hash = (:hash)');
            $q->bindValue(':hash', $FILE_INFO['SHA1']);
            $q->execute();
            $result = $q->fetch();
            if ($result['count'] > 0) {
                throw new Exception('File blacklisted!', 415);
            }
        } catch (Exception) {
            throw new Exception('Cant check blacklist DB.', 500);
        }
    }

    /**
     * Checks if the file already exists in the database
     *
     * @param $hash string The hash of the file you want to check for.
     *
     * @throws \Exception
     */
    public function antiDupe(string $hash): array
    {
        try {
            $q = $this->DB->prepare(
                'SELECT filename, COUNT(*) AS count FROM files WHERE hash = (:hash)',
            );
            $q->bindValue(':hash', $hash);
            $q->execute();
            $result = $q->fetch();
            if ($result['count'] > 0) {
                return [
                'result' => true,
                'name' => $result['filename'],
                ];
            } else {
                return [
                   'result' => false
                ];
            }
        } catch (Exception) {
            throw new Exception('Cant check for dupes in DB.', 500);
        }
    }

    /**
     * Inserts a new file into the database
     *
     * @param $FILE_INFO       array
     * @param $fingerPrintInfo array
     *
     * @throws \Exception
     */
    public function newIntoDB(array $FILE_INFO, array $fingerPrintInfo): void
    {
        try {
            $q = $this->DB->prepare(
                'INSERT INTO files (hash, originalname, filename, size, date, ip)' .
                'VALUES (:hash, :orig, :name, :size, :date, :ip)',
            );
            $q->bindValue(':hash', $FILE_INFO['SHA1']);
            $q->bindValue(':orig', $FILE_INFO['NAME']);
            $q->bindValue(':name', $FILE_INFO['NEW_NAME']);
            $q->bindValue(':size', $FILE_INFO['SIZE'], PDO::PARAM_INT);
            $q->bindValue(':date', $fingerPrintInfo['timestamp']);
            $q->bindValue(':ip', $fingerPrintInfo['ip']);
            $q->execute();
        } catch (Exception) {
            throw new Exception('Cant insert into DB.', 500);
        }
    }

    /**
     * Creates a new row in the database with the information provided
     *
     * @param $fingerPrintInfo array
     */
    public function createRateLimit(array $fingerPrintInfo): void
    {
        $q = $this->DB->prepare(
            'INSERT INTO timestamp (iphash, files, time)' .
            'VALUES (:iphash, :files, :time)',
        );
        $q->bindValue(':iphash', $fingerPrintInfo['ip_hash']);
        $q->bindValue(':files', $fingerPrintInfo['files_amount']);
        $q->bindValue(':time', $fingerPrintInfo['timestamp']);
        $q->execute();
    }

    /**
     * Update the rate limit table with the new file count and timestamp
     *
     * @param $fCount          int The number of files uploaded by the user.
     * @param $iStamp          boolean A boolean value that determines whether or not to update the timestamp.
     * @param $fingerPrintInfo array An array containing the following keys:
     */
    public function updateRateLimit(int $fCount, bool $iStamp, array $fingerPrintInfo): void
    {
        if ($iStamp) {
            $q = $this->DB->prepare(
                'UPDATE ratelimit SET files = (:files), time = (:time) WHERE iphash = (:iphash)',
            );
            $q->bindValue(':time', $fingerPrintInfo['timestamp']);
        } else {
            $q = $this->DB->prepare(
                'UPDATE ratelimit SET files = (:files) WHERE iphash = (:iphash)',
            );
        }
        $q->bindValue(':files', $fCount);
        $q->bindValue(':iphash', $fingerPrintInfo['ip_hash']);
        $q->execute();
    }

    /**
     * Checks if the user has uploaded more than 100 files in the last minute, if so it returns true, if not it updates the database with the new file
     * count and timestamp
     *
     * @param $fingerPrintInfo array An array containing the following:
     *
     * @return bool A boolean value.
     */
    public function checkRateLimit(array $fingerPrintInfo): bool
    {
        $q = $this->DB->prepare(
            'SELECT files, time, iphash, COUNT(*) AS count FROM ratelimit WHERE iphash = (:iphash)',
        );
        $q->bindValue(':iphash', $fingerPrintInfo['ip_hash']);
        $q->execute();
        $result = $q->fetch();
        $nTime = $fingerPrintInfo['timestamp'] - (60);
        switch (true) {
            //If more then 100 files trigger rate-limit
            case $result['files'] > 100:
                return true;
            //if timestamp is older than one minute, set new files count and timestamp
            case $result['time'] < $nTime:
                $this->updateRateLimit($fingerPrintInfo['files_amount'], true, $fingerPrintInfo);
                break;
            //if timestamp isn't older than one-minute update the files count
            case $result['time'] > $nTime:
                $this->updateRateLimit($fingerPrintInfo['files_amount'] + $result['files'], false, $fingerPrintInfo);
                break;
            //If there is no other match a record does not exist, create one
            default:
                $this->createRateLimit($fingerPrintInfo);
                break;
        }
        return false;
    }
}