<?php
//////////////////////
// TokenManager.php //
// DigiErbe Tresor  //
//////////////////////

class TokenManager {
    /*
     * VARIABLES
     */
    private string $storagePath; // Subdirectory under Tresor's /private directory to use to store all the token information
    private int $expireDays;     // number of dates for a token to expire
    private int $maxDownloads;   // maximum number of downloads before a token becomes invalid
    private int $tokenLength;    // number of random bytes to use to create the token name
    private string $allowedUser; // the user allowed to access the token
    
    /*
     * PUBLIC FUNCTIONS
     */

    // initialize the token instance in PHP
    public __contruct(
        string $storagePath = '/tokens',
        int $exireDays = 1,
        int $maxDownloads = 1,
        int $tokenLength = 32
    ) {
        $this->storagePath = $storagePath;
        $this->$expireDays = $expireDays;
        $this->$maxDownloads = $maxDownloads;
        $this->$tokenLength = $tokenLength;
    }

    // generate a new token and save it to the file system
    public generateToken(
        string $filename,
        string $ownerName,
        string $allowedUser
    ) {
        return (['error'=>'no token generated', 'status'=>'500']);
    }

    // retrieve/download the key file connected with the token
    public retrieveToken(string $tokenName) {

    }

    // check a token and remove it when it's expired
    public cleanupToken(string $tokenName) {

    }

    /*
     * PRIVATE FUNCTIONS
     */
    
    // check whether a token is still valid and accessible by the user requesting it
    private validateToken($tokenName) {
        return null;
    }

    private getDownloadFileInfo ($tokenName) {
        $fileInfo = [];
        return null;
    }
}