In Drupal, how to validate the contents of a file uploaded using webforms and *not* upload if it fails validation? - validation

Question

I am implementing a site that accepts archives with directory structure in a specific fashion. I want to check the directory structure in the zipfile before accepting it. I tried the following (please see comments inline):
<?php
Using Webform Validation:
// using the webform validation module and its hooks
function testsuite_ziptest_webform_validation_validators()
{
return array(
"validate_zip_file"=> array(
'name' => "testsuite: Validate Zipfile" ,
'component_types' => array(
'select',
'file',
),
'description' => t('Verifies that the contents of the zipfile adhere to the specifications of testsuite.'),
)
);
}
function testsuite_ziptest_webform_validation_validate($validator_name, $items, $components, $rule)
{
$errors = array();
if($items)
{
switch($validator_name)
{
case "validate_zip_file":
drupal_set_message(t('Validate function called'));
foreach($items as $key=>$value)
{
drupal_set_message($key);
$v = _webform_validation_flatten_array($value);
drupal_set_message($v);
}
// tried to get the $fid and access the file using the fid.
// item_6 is the key of the file field that I selected while
// enabling webform validation.
// This fails saying no such file exists when the ziparchive
// object tries to open it.
$fid = $items['item_6'];
if(!empty($fid))
{
$za = new ZipArchive();
$file = file_load($fid);
$za->open($file->uri);
for($i = 0; $i < $za->numFiles; $i++)
{
$stat = $za->statIndex($i);
drupal_set_message($stat['name']);
}
$za->close();
}
break;
}
}
return $errors;
}
Using hook_file_validate
// this works, but there might be other files that may
// be uploaded to the site and I only want it to trigger
// when the file is uploaded as a part of a webform, not
// for all file uploads.
function testsuite_ziptest_file_validate($file)
{
if(!empty($file->filename))
{
$za = new ZipArchive();
$za->open($file->uri);
for($i = 0; $i < $za->numFiles; $i++)
{
$stat = $za->statIndex($i);
drupal_set_message($stat['name']);
}
$za->close();
}
}
Using Forms API (?)
// The following two methods that uses the form api on the webform
// has the same issue as the webform validation module. I can't get
// any reference to the file.
// There is a reference through a "completed form" key but I don't know
// if this is best practice
// die statements were used for debugging
function testsuite_ziptest_form_alter(&$form, &$form_state, $form_id)
{
if($form_id == 'webform_client_form_1')
{
array_unshift($form['#validate'], 'testsuite_ziptest_form_validate');
return $form;
}
}
function testsuite_ziptest_form_validate($form, &$form_state)
{
echo '<pre>'; print_r($form_state); echo '</pre>';
die();
$fid = $form_state['values']['submitted']['attachment'];
if(!empty($fid))
{
$za = new ZipArchive();
$file = file_load($fid);
$za->open($file->uri);
for($i = 0; $i < $za->numFiles; $i++)
{
$stat = $za->statIndex($i);
drupal_set_message($stat['name']);
}
$za->close();
}
else
{
}
die();
return;
}
Thanks!

Answer 1

I think you miss a point when you've done your function. You simply forgot to send the error back.
In the Webforms validation process, you have to send back some elements in the $errors array if something gone wrong.
$errors[$key] = t('%item is not good', array('%item' => $components[$key]['name']));
Here is an example of using this method.
In the Drupal form validation process, you have to use form_set_error if something is not good, with the combo name and the error message. The validation then stop automatically and the form will not be submitted...
And in the hook_file_validate method, you also have to send back an array of errors, witch will be use by the validator to stop the submission (with form_set_error).

Answer 2

Its Working Example :
function yourmoduleNma_file_validate($file,$validators)
{
$errors = array();
$filename = $file->filename;
$isValid_Extention_Size = explode('.',$filename);
if(count($isValid_Extention_Size) > 2){
$errors[] = 'Extention is not valid of this file';
}
elseif($file->filesize <= 0)
{
$errors[] = 'File size should be greater than 0 Bytes and less than 5 MB';
}
return $errors;
}