Check Valid Pdf file

jeeva · December 24, 2007

hi frnds,

i want validate the uploaded file is valid pdf file or not?

Right now i have validated only by extension(.pdf) using javascript.And i also want

to check the pdf content wether the content is valid pdf content or not?

have u done anything like this? if s please let me know wt i have to do?

cooldude832 · December 24, 2007

found this on php.net

<?php
define('PDF_MAGIC', "\\x25\\x50\\x44\\x46\\x2D");
function is_pdf($filename) {
  return (file_get_contents($filename, false, null, 0, strlen(PDF_MAGIC)) === PDF_MAGIC) ? true : false;
}
?>

So run that and if you get true the headers are pdf else it ain't

jeeva · December 24, 2007

thanks for reply cooldude832,

The script is not working.

Its returns false either way...

mmarif4u · December 24, 2007

Try this function:

  
function GetExtention($type){
if($type == "application/pdf")
return "pdf";
elseif($type == "application/x-pdf")
return "pdf";
}

jeeva · December 24, 2007

sorry....no use..

Ken2k7 · December 24, 2007

Can't you just use HTML?

I think it's something like that. hmmm

Or I think you can do this too:

strpos($filename,'.pdf')

mmarif4u · December 24, 2007

Can you show us your complete code, how u use the function in it.

jeeva · December 24, 2007

Actually i have done with the extension part...

i need to check the valid pdf file without testing the extension.In order to avoid the invalid pdf file i have to do this validation.....

jeeva · December 24, 2007

Here is my code

<?php

include_once("upload.inc.php");

if(isset($_POST['submit']))
{
	$myUploadobj = new UPLOAD; //creating instance of file.
	$upload_dir="images";
	echo "<br>";
	// use function to upload file.
	$file=$myUploadobj->upload_file($upload_dir,'file',true,true,0,"jpg|jpeg|gif|pdf"); 
	if($file==false)
		echo $myUploadobj->error;
	else
		echo "File Name : ".$file;	
	echo "<br>";
}

?>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style>
a {  font-family: Verdana, Arial, Helvetica, sans-serif; font-weight: bold; color: #008080; text-decoration: none; font-size: 12px;}
</style>
</head>

<body bgcolor="#FFFFFF" text="#000000">
<form name="test" method="POST" action="" enctype="multipart/form-data">
<input type="FILE" name="file">
  <input type="SUBMIT" name="submit" value="submit">
</form>
</body>
</html>

upload.inc.php

<?php


  class UPLOAD
  {
  	var $directory_name;
  	var $max_filesize;
  	var $error;
  	var $file_name;
  	var $full_name;
  	var $file_size;
  	var $file_type;
  	var $check_file_type;
  	var $thumb_name;
    var $tmp_name;
    
   	function set_directory($dir_name = ".")
  	{
  	 $this->directory_name = $dir_name;
  	}

   	function set_max_size($max_file = 3000000)
  	{
  	 $this->max_filesize = $max_file;
  	}
  	
  	function check_for_directory()
  	{
        if (!file_exists($this->directory_name))
        {
           mkdir($this->directory_name,0777);
        }
        @chmod($this->directory_name,0777);
  	}

   	function error()
  	{
  	 return $this->error;
  	}

  	function set_file_size($file_size)
  	{
  	 $this->file_size = $file_size;
  	}

  	function set_file_type($file_type)
  	{
  	 $this->file_type = $file_type;
  	}

  	function get_file_type()
  	{
  	 return $this->file_type;
  	}

  	function set_temp_name($temp_name)
  	{
  	 $this->tmp_name = $temp_name;
  	}

   	function set_file_name($file)
  	{
  		$this->file_name = $file;
  		$this->full_name = $this->directory_name."/".$file;
  	}
  	/*
* @PARAMS : 
* 	$uploaddir : Directory Name in which uploaded file is placed
* 	$name : file input type field name
* 	$rename : you may pass string or boolean 
* 			 true : rename the file if it already exists and returns the renamed file name.
* 			 String : rename the file to given string.
* 	$replace =true : replace the file if it is already existing
* 	$file_max_size : file size in bytes. 0 for default
* 	$check_type : checks file type exp ."(jpg|gif|jpeg)"
* 
* 	Example UPLOAD::upload_file("temp","file",true,true,0,"jpg|jpeg|bmp|gif")
* 
* return : On success it will return file name else return (boolean)false
*/

    function upload_file($uploaddir,$name,$rename=null,$replace=false,$file_max_size=0,$check_type="")
    {
        $this->set_file_type($_FILES[$name]['type']);
        $this->set_file_size($_FILES[$name]['size']);
        $this->error=$_FILES[$name]['error'];
        $this->set_temp_name($_FILES[$name]['tmp_name']);
        $this->set_max_size($file_max_size);

	$this->set_directory($uploaddir);
        $this->check_for_directory();
        $this->set_file_name($_FILES[$name]['name']);

	if(!is_uploaded_file($this->tmp_name))
	 $this->error = "File ".$this->tmp_name." is not uploaded correctly.";

	if(empty($this->file_name))
	 $this->error = "File is not uploaded correctly.";
	if($this->error!="")
          return false;


	if(!empty($check_type))
        {
	   if(!eregi("\.($check_type)$",$this->file_name))
	   {
           	 $this->error="File type error : Not a valid file";
		 return false;
		}
        }

	if(!is_bool($rename)&&!empty($rename))
	{
		if(preg_match("/\..*+$/",$this->file_name,$matches))
		   $this->set_file_name($rename.$matches[0]);
	}
	elseif($rename && file_exists($this->full_name))
	{
		if(preg_match("/\..*+$/",$this->file_name,$matches))
		   $this->set_file_name(substr_replace($this->file_name,"_".rand(0, rand(0,99)),-strlen($matches[0]),0));
	}

	if(file_exists($this->full_name))
        {
          if($replace)
            @unlink($this->full_name);
          else
	  {
           	 $this->error="File error : File already exists";
		 return false;
	  }
        }


        $this->start_upload();
        if($this->error!="")
          return false;
        else
          return $this->file_name;
    }

  	function start_upload()
  	{
  		if(!isset($this->file_name))
  		 $this->error = "You must define filename!";

      if ($this->file_size <= 0)
  		 $this->error = "File size error (0): $this->file_size Bytes<br>";

      if ($this->file_size > $this->max_filesize && $this->max_filesize!=0)
  		 $this->error = "File size error (1): $this->file_size Bytes<br>";

       if ($this->error=="")
       {
		$destination=$this->full_name;
  			if (!@move_uploaded_file ($this->tmp_name,$destination))
  			 $this->error = "Impossible to copy ".$this->file_name." from $userfile to destination directory.";
  		}
  	}

  }
?>

jeeva · December 24, 2007

nobody.........?

~n[EO]n~ · December 24, 2007

I do it like this

<?php
// $FILES file_pdf is name of the file field
if(!ereg(".pdf", $_FILES["file_pdf"]["name"]))
{
	echo "File should be of .pdf extension";
}
else 
{
	echo "File is valid...";
}

?>

jeeva · December 26, 2007

i need to check the valid pdf file without testing the extension...

Actually i have done with the extension part... >:(

PHP_PhREEEk · December 26, 2007

I have this working on php 5.2.5:

<?php

define('PDF_MAGIC', "\x25\x50\x44\x46\x2D");
function is_pdf($filename) {
    return (file_get_contents($filename, false, null, 0, strlen(PDF_MAGIC)) === PDF_MAGIC) ? true : false;

}

Example:

<?php

$pdf_result = is_pdf('a_valid_pdf_file.pdf');
var_dump($pdf_result);

// prints bool(true)

$pdf_result = is_pdf('a_different_file.zip');
var_dump($pdf_result);

// prints bool(false)

$pdf_result = is_pdf('a_valid_pdf_file.zip');
var_dump($pdf_result);

// prints bool(true)

$pdf_result = is_pdf('a_different_file.pdf');
var_dump($pdf_result);

// prints bool(false)

So, regardless of file extension, the header is valid or not. Note that I just removed a leading slash from each value in the DEFINE. Slap this puppy solved if it works for you...

PhREEEk

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