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<?php
require_once "configuration.php";
require_once "user.php";
require_once "misc.php";
require_once "node.php";
/*handles database stuff*/
class Database
{
private $pdo;
public function __construct()
{
global $domain_name;
global $database_name;
global $database_username;
global $database_password;
global $database_location;
$this->pdo=new PDO("mysql:dbname={$database_name};host={$database_location}",$database_username,$database_password);
}
/*returns false if this isn't a user, otherwise returns the user*/
function get_user(string $user)
{
$ret=new User;
$prep=$this->pdo->prepare("select user_id,username,email from users where username=:username");
$prep->bindParam(':username',$user);
$prep->execute();
$hold=$prep->fetch(PDO::FETCH_ASSOC);
if($hold)
{
$ret->user_id=$hold["user_id"];
$ret->username=$hold["username"];
$ret->email_address=$hold["email"];
$ret->current_directory=$hold["home_directory"];
return $ret;
}else
{
return false;
}
}
/*returns false if this isn't a user or the password is incorrect, otherwise returns the userid*/
function authenticate(string $user, string $password)
{
$ret=new User;
$prep=$this->pdo->prepare("select user_id,username,email,password from users where username=:username");
$prep->bindParam(':username',$user);
$prep->execute();
$hold=$prep->fetch(PDO::FETCH_ASSOC);
if($hold)
{
if(password_verify($password,$hold["password"]))
{
$ret->user_id=$hold["user_id"];
$ret->username=$hold["username"];
$ret->email_address=$hold["email"];
return $ret;
}else
{
return false;
}
}else
{
return false;
}
}
function get_home_id($user_id)
{
$statement=$this->pdo->prepare("select home_directory
from users
where user_id=:id
");
$statement->bindParam(':id',$user_id);
$ret=$statement->execute(PDO::FETCH_ASSOC);
return $ret["home_directory"];
}
function get_node_id($name,$directory_id)
{
$hold=NULL;
$statement=NULL;
$ret=[];
if($name != NULL)
{
if($directory_id!=NULL)
{
$statement=$this->pdo->prepare(
"select nl.node_id as id from node_links nl
inner join nodes n on n.node_id=nl.node_id
where name=:name and directory_id=:directory_id)");
$statement->bindParam(':name',$name);
$statement->bindParam(':directory_id',$directory_id);
}else
{
/*get all node_ids with the name name*/
$statement=$this->pdo->prepare("select node_id as id from nodes where name=:name");
$statement->bindParam(':name',$name);
}
if($statement==NULL)
{
error_log("statement is null");
exit(1);
}
}else {
$statement=$this->pdo->prepare("select node_id as id from node_links where directory_id=:dir_id");
$statement->bindParam(':dir_id',$directory_id);
}
if($statement->execute()==false)
{
error_log("there is an error in the sql statement in get_node_id");
exit(1);
}
while($hold=$statement->fetch(PDO::FETCH_ASSOC))
{
print_r($hold);
array_push($ret,$hold["id"]);
}
return $ret;
}
function get_random_node_name(string $prefix)
{
do{
$proposal=uniqid($prefix,true);
}while($this->get_node_id($proposal,NULL)!=NULL);
return $proposal;
}
/*returns NULL if node doesn't exist*/
/*if name is NULL return all node ids in the directory*/
/*if directory is NULL return all node ids with the name name*/
/*if both are null return NULL*/
/*returns node id*/
function create_dangling_directory(): int
{
$dir_name=$this->get_random_node_name("");
global $storage_root;
$prep=$this->pdo->prepare("insert into nodes(is_directory,relative_path,name) values(true,:root,:name)");
$prep->bindParam(':name',$dir_name);
$prep->bindParam(':root',$storage_root);
if($prep->execute()==false)
{
error_log("tried to create a dangling directory but sql statement failed. Fatal error!");
exit(1);
}
$id=$this->get_node_id($dir_name,NULL);
if(count($id)!=1)
{
error_log("created a dangling directory but couldn't find it afterward. Fatal error!");
exit(1);
}
//print count($id);
return $id[0];
}
function are_linked(int $directory_id,int $node_id): bool
{
$prepare=$this->pdo->prepare("select node_id
from node_links
where node_id=:node_id and directory_id=:dir_id
");
$prepare->bindParam(':node_id',$node_id);
$prepare->bindParam(':dir_id',$directory_id);
if($prepare->execute()==false)
{
error_log("there is an sql error in are_linked");
/*quiet error*/
return false;
}
if(count($prepare->fetch(PDO::FETCH_ASSOC))==1)
{
return true;
}else
{
return false;
}
}
/*returns false if username is taken, email is not checked here*/
function register_user(string $user,string $password,string $email) : bool
{
$hold=$this->get_user($user);
global $domain_name;
global $has_email_verification;
global $password_hash_algo;
if($hold)
{
return false;
}else
{
if($has_email_verification)
{
generate_email_verification_link();
}else
{
$hashed_pass=password_hash($password,$password_hash_algo);
$home_dir=$this->create_dangling_directory();
$prep=$this->pdo->prepare("insert into users(username,password,email,home_directory) values(:username,:password,:email,:dir)");
$prep->bindParam(':username',$user);
$prep->bindParam(':password',$hashed_pass);
$prep->bindParam(':email',$email);
$prep->bindParam(':dir',$home_dir);
if($prep->execute()==false)
{
error_log("can't create user because there was an error in the sql statement");
/*todo make an error page*/
exit(1);
}
}
return true;
}
}
}
$database=new Database();
?>
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