Image Mime Type mystery in Drupal

PHP
1

I have a development Drupal 6.19 / WAMP setup that’s giving me some headaches. Among the mysteries are some apparently broken image paths that appear to be pointing to the correct locations/files. On inspecting the image in Chrome developer tools (under the “resources” tab), I find: mime-type = application/x-httpd-php.

I have:

  • image/png png defined in file mime.types
  • mime.types is included in httpd.conf via TypesConfig conf/mime.types
  • since it’s a WAMP server we also have LoadModule mime_module modules/mod_mime.so
  • and finally the php.ini has only default_mimetype = “text/html”

Apache directory structure:

\\Apache Software Foundation 
     \\Apache2.2
          \\conf
               httpd.conf
               mime.types

Note that httpd.conf & mime.types are in the same directory.

Am I missing something here? Is the path to mime.types supposed to be relative to httpd.conf, or to the PHP root folder? or is the problem in Drupal?

2

You’re trying to access $image[‘mime’] but $image is the actual GD image resource.

Try this:


define('MIN_WIDTH', 225);
define('MIN_HEIGHT', 225);

$path = $_SERVER['DOCUMENT_ROOT'].$_SERVER['REQUEST_URI'];
$image = imagecreatefromstring(file_get_contents($path));
$image_data = getimagesize($path);

$w = imagesx($image);
$h = imagesy($image);

if ($w >= MIN_WIDTH && $h >= MIN_HEIGHT) {
    $watermark = imagecreatefrompng('watermark.png');
    $ww = imagesx($watermark);
    $wh = imagesy($watermark);
    imagecopy($image, $watermark, (($w/96)-($ww/96)), (($h/96)-($wh/96)), 0, 0, $ww, $wh);
    header('Content-Type: ' . $image_data['mime']);
    imagepng($image,null,0,PNG_NO_FILTER);
    exit();
} else {
    imagecopy($image);
    header('Content-Type: ' . $image_data['mime']);
    imagepng($image,null,0,PNG_NO_FILTER);
    exit();
}

Check the bit I’ve added for $image_data.

3

I just tried that — while it works fine on the production server (which was working OK anyway), it still doesn’t seem to work on the testing server. Here’s the full code:

define('MIN_WIDTH', 225);
define('MIN_HEIGHT', 225);

$path = $_SERVER['DOCUMENT_ROOT'].$_SERVER['REQUEST_URI'];

$image = imagecreatefromstring(file_get_contents($path));

$w = imagesx($image);
$h = imagesy($image);

if ($w >= MIN_WIDTH && $h >= MIN_HEIGHT) {
	$watermark = imagecreatefrompng('watermark.png');
	$ww = imagesx($watermark);
	$wh = imagesy($watermark);
	
	imagecopy($image, $watermark, (($w/96)-($ww/96)), (($h/96)-($wh/96)), 0, 0, $ww, $wh);
	
	header('Content-Type: ' . $image['mime']);
	imagepng($image,null,0,PNG_NO_FILTER);
	exit();
} else {
	imagecopy($image);
	
	header('Content-Type: ' . $image['mime']);
	imagepng($image,null,0,PNG_NO_FILTER);
	exit();
}
4

It turns out it was an .htaccess issue. I’ve got a rewrite rule that looks for image files & runs a PHP script to watermark them. It works fine on my production server, but for some reason I haven’t figured out, bollixes the development server.

My version of the script includes the changes found in my comment to the article, namely, repositioning the watermark & using an if loop to prevent watermarks on smaller images. Oh, I guess I didn’t post the if loop. So if any one is interested, it’s just:

define('MIN_WIDTH', 225);
define('MIN_HEIGHT', 225);
...
$w = imagesx($image);
$h = imagesy($image);
...
if ($w >= MIN_WIDTH && $h >= MIN_HEIGHT) {
(do stuff);
}
5

The closest thing to a root folder is the “sites” folder, since I’m running a multi-site setup w/ single codebase. If I drop the PNG there, I can view it & it appears to be the correct MIME type.

No clue which PHP in Drupal might be processing the image before the browser sees it. I’m using a couple of Drupal modules (Image & Image Assist) + the ImageMagick Toolkit, so there’s a lot going on w/ it – but I can tell you, they are creating a PNG file; it’s just not accessible thru the website.

6

Are the images processed by PHP before being output to the server?
In that case, the code (in Drupal, I guess) that processes the images should be outputting the image/png header.

If you put a png image in your websrver’s root, and request it directly, what headers are sent?

7

What you could do is to add the following header to that file, it’ll stop your mime-type problems and keep the watermarking active:


$data = getimagesize($path_to_image);
header('Content-Type: ' . $data['mime']);
8

[strike]Beautiful. Thanks for all the advice.[/strike]Whoops, forgot to save the .htaccess – still doesn’t work.