Can't open csv file: Permission denied.

[T Kawagoe]

Hi, experts.

I'm now working on my online psychological experiment by using the jsPsych.

I would like to get the result csv file via the web server.

The jsPsych's website (https://www.jspsych.org/overview/data/) introduces how to do it as:

PHP script

<?php

$post_data = json_decode(file_get_contents('php://input'), true); 

// the directory "data" must be writable by the server

$name = "data/".$post_data['filename'].".csv"; 

$data = $post_data['filedata'];

// write the file to disk

file_put_contents($name, $data);

?>

 AJAX call.

function saveData(name, data){

  var xhr = new XMLHttpRequest();

  xhr.open('POST', 'write_data.php'); // 'write_data.php' is the path to the php file described above.

  xhr.setRequestHeader('Content-Type', 'application/json');

  xhr.send(JSON.stringify({filename: name, filedata: data}));

}

// call the saveData function after the experiment is over

jsPsych.init({

   // code to define the experiment structure would go here...

   on_finish: function(){ saveData("experiment_data", jsPsych.data.get().csv()); }

});

These scripts worked and the resulting csv file was created at the "data" directory.

However, I cannot get the file. When I copy or download it, it says "Can't open nl3vxrc.csv: Permission denied." 

Although the permissions of every directory/file on the server are set as 0777, the created resulting file is "0640" (rw-r-----). 

What can I do to solve this?

Thank you in advance!

TKawagoe