php - pdftk Error: Failed to open PDF file: -


i using pdftk library extract form fields pdf .everything running fine except 1 issue got pdf file pdf file link. causes error given bellow

error: failed open pdf file:     http://www.uscis.gov/sites/default/files/files/form/i-9.pdf done.  input errors, no output created.

command 

root@ri8-ms-7788:/home/ri-8# pdftk http://192.168.1.43/form/i-9.pdf dump_data_fields

the same command working other forms .

attempt1

i have tried encrypt pdf unsafe version produce same error . here command

pdftk http://192.168.1.43/forms/i-9.pdf input_pw foopass output /var/www/forms/un-i-9.pdf

update

this full function handle 

public function formanalysis($pdfname)      {          $pdffile=yii::app()->getbaseurl(true).'/uploads/forms/'.$pdfname;         exec("pdftk ".$pdffile." dump_data_fields 2>&1", $output,$retval);         //got error pdf if these secure          if(strpos($output[0],'error') !== false)         {             $unsafepdf=yii::getpathofalias('webroot').'/uploads/forms/un-'.$pdfname;             //echo "pdftk ".$pdffile." input_pw foopass output ".$unsafepdf;             exec("pdftk ".$pdffile." input_pw foopass output ".$unsafepdf);             exec("pdftk ".$unsafepdf." dump_data_fields 2>&1", $outputunsafe,$retval);             return $outputunsafe ;             //$response=array('0'=>'error','error'=>$output[0]);             //return $response;          }          //if (strpos($output[0],'error') !== false){ echo  "error run" ; }   // option handle error          return $output;      }

this may little trick solution should work . @bruno said encrypted file . should decrypt before use pdftk . found way decrypt qpdf free opem source library decrypt pdf, remove owner , user passwords etc , many more. can find here qpdf. install on system . , run command 

qpdf --decrypt input.pdf output.pdf

then use output file in pdftk command . should work .


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