PHP "save dialog" for file received from web service - php

Question

I'm using WSO2 WS Framework and I managed to run example in which web service returns an image as a MTOM attachment which is then saved by the client using file_put_contents(...) command.
Service:
<?php
function sendAttachment($msg){
$responsePayloadString = <<<XML
<ns1:download xmlns:ns1="http://wso2.org/wsfphp/samples/mtom">
<ns1:fileName>test.jpg</ns1:fileName>
<ns1:image xmlmime:contentType="image/jpeg" xmlns:xmlmime="http://www.w3.org/2004/06/xmlmime">
<xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:myid1"></xop:Include>
</ns1:image>
</ns1:download>
XML;
$f = file_get_contents("test.jpg");
$responseMessage = new WSMessage($responsePayloadString,
array( "attachments" => array("myid1" => $f)));
return $responseMessage;
}
$operations = array("download" => "sendAttachment");
$service = new WSService(array("operations" => $operations, "useMTOM" => TRUE));
$service->reply();
?>
Client:
<?php
$requestPayloadString = '<download></download>';
try {
$client = new WSClient(
array( "to" => "http://SPLINTER/MTOM/service.php",
"useMTOM" => TRUE,
"responseXOP" => TRUE));
$requestMessage = new WSMessage($requestPayloadString);
$responseMessage = $client->request($requestMessage);
printf("Response = %s \n", $responseMessage->str);
$cid2stringMap = $responseMessage->attachments;
$cid2contentMap = $responseMessage->cid2contentType;
$imageName;
if($cid2stringMap && $cid2contentMap){
foreach($cid2stringMap as $i=>$value){
$f = $cid2stringMap[$i];
$contentType = $cid2contentMap[$i];
if(strcmp($contentType,"image/jpeg") ==0){
$imageName = $i."."."jpg";
if(stristr(PHP_OS, 'WIN')) {
file_put_contents($imageName, $f);
}else{
file_put_contents("/tmp/".$imageName, $f);
}
}
}
}else{
printf("attachments not received ");
}
} catch (Exception $e) {
if ($e instanceof WSFault) {
printf("Soap Fault: %s\n", $e->Reason);
} else {
printf("Message = %s\n",$e->getMessage());
}
}
?>
Instead of that I would like to open a "Save dialog" to choose between opening or saving the file. When searching for solution I read about setting heders like:
header('Content-type: application/octet-stream');
header('Content-disposition: attachment; filename="test.jpg"');
But it didn't work well. "Save dialog" poped up, but when image couldn't be opened saying that file is empty.
Actually I don't understand very good how this MTOM attachments thing is working. In client code, I think $f is a string and when I do printf($f) it prints 0(zero) so how can I save this string as an image?

Answer 1

If you want to use that headers, you have to output the file content, not save it somewhere.
header('Content-type: application/octet-stream');
header('Content-disposition: attachment; filename="test.jpg"');
// Output file. This must be the ONLY output of the whole script
echo $rawFileContents;
The basics is that at the moment you have your whole file content loaded in a variable (and it seems is $f in your code), you output it instead of write it in a file (as I think you're doing now). So, the three lines of code I gave you should replace the file_put_contents() calls.
Instead, if you want to save the file in your /tmp folder, ok, do it, but then use instead
header('Location: /tmp/' . $imageName);
This way you redirect the user browser directly to the saved file, and let users do what they want with it.