Extension of client-server components for receiving and transmitting fp3 files

<?php
//FastReport server address
$host ='http://localhost:8097';
//Export format
$exportFormat = 'PDF';
 
//The name of the file selected by the user
$OldName = $_FILES['userfile']['name']; 
//Its actual name after our download (replace the tmp extension with fp3)
$name = substr_replace($_FILES['userfile']['tmp_name'], 'fp3', -3);
//Save on the php server
move_uploaded_file($_FILES['userfile']['tmp_name'], $name);
//Open it
$file = new \CURLFile($name);
//Initialize the cURL session
$ch = curl_init();
 
//Install the downloadable url
curl_setopt($ch, CURLOPT_URL, $host);
//Choose a query method (Post)
curl_setopt($ch, CURLOPT_POST, true);
//To read the returned data
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
//To read the returned header
curl_setopt($ch, CURLOPT_HEADER, 1);
//For large files, you need to increase the waiting time for sending (by default 30 seconds), set to 0, which means infinite waiting.
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0); 
 
//Generating MD5 for the file.
$md5 = md5_file($name);
//Sending format and MD5
curl_setopt($ch, CURLOPT_HTTPHEADER , array('Format-Export: '.$exportFormat, 'Content-MD5: '.$md5));
 
//Zip the file before sending
$data = array($exportFormat => $file);
//Sending the file
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
//Waiting for a response
$response = curl_exec($ch);
 
// Debug return check-out
if (empty($response))
{
 echo 'received an empty response';
}
else
{
 if (strstr($response, 'HTTP/1.1 301') == '')
 {
 //Something went wrong. The server returned an unexpected response
 echo '404';
 curl_close($ch);
 exit;
 }
 if (curl_errno($ch))
 {
 //The server returned an error, which we display in red
 echo '<span style="color:red">';
 echo 'error: '.curl_error($ch);
 echo '</span>';
 }
 else
 {
 //Extract the address from the FastReport server response to receive export results
 $Location = GetLocationFromHeader($response);
 if (empty($Location))
 {
 echo 'error: Location not found';
 }
 else
 {
 //You can direct the client to the address to receive the file, but not in an architecture where the FastReport server 

 //is connected to the php server locally and does not have access to the Internet. You will have to download 

//everything using the php server and it is safer from the point of view of logic in order to protect people's documents.

 $file = file_get_contents_curl($host.$Location);
 if (empty($file))
 {
 echo 'error: file missing';
 }
 {
 //We need to generate a new name to return the file to the client.
 //Everything is implemented as follows: The file name is the same as that of the client, 

 //and the server response is analyzed to obtain the extension.
 
 //Let's extract the format from the response. We take the old name that the client sent us 

 //and replace the extension with the export result (if he sent 123.fp3, we will get 123.pdf).
 $Format = getExtension(GetFileNameFromLocation($Location));
 $OldName = substr_replace($OldName, $Format, -3);
 
 //Transferring files from the php server to the client
 header('X-Accel-Redirect: storage/'.$OldName);
 header('Content-Disposition: attachment; filename="'.$OldName.'"');
 echo $file;
 }
 }
 }
}
curl_close($ch);
 
 
 
//Secondary functions
//Extracts the address from the server response to get the conversion result
function GetLocationFromHeader($arg_1)
{
 $Location = strstr($arg_1, 'Location');
 $Location = strstr($Location, '/');
 $Location = substr($Location, 0, strrpos($Location, 'SessionId')-2);
 return $Location;
}
 
//Getting filename from response
function GetFileNameFromLocation($arg_1)
{
 $FN = substr($arg_1, strripos($arg_1, '/')+1, strlen($arg_1));
 return $FN;
}
 
//Getting extension from filename
function getExtension($fileName)
{
 return substr($fileName, strrpos($fileName, '.') + 1);
}
 
//Faster function counterpart file_get_contents
function file_get_contents_curl($url)
{
 $ch = curl_init();
 
 curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
 curl_setopt($ch, CURLOPT_HEADER, 0);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
 
 $data = curl_exec($ch);
 curl_close($ch);
 
 return $data;
}
?>