ImageMagick: Receiving invalid filename error when converting first page of pdf to jpg

[kevindeleon]

Environment: Ubuntu 14.04, HHVM 3.5

I'm using ImageMagick to convert a pdf to a jpg in a script I have...it works fine if I give the full server path to the uploaded pdf without the page specifier, but when I add the [0] onto the end of the file path to specify that I only want to read the first page, it bombs out with the following error:

"Fatal error: Uncaught exception 'ImagickException' with message
'Invalid filename provided' Imagick->readImage()"

I've also tried using '/path/to/file.pdf[0]' directly in the constructor with no luck, but without the page specifier, that also works fine.

According to what I've read in the PHP docs and tested, this code should work, but gives the error seen above when using the page specifier.

$doc_preview = new Imagick();
$doc_preview->setResolution(180,180);
$doc_preview->readImage('/path/to/file.pdf[0]');
$doc_preview->setImageFormat('jpeg');
$doc_preview->writeImage('/path/to/file.jpg');
$doc_preview->clear();
$doc_preview->destroy();

[paulbiss]

Looks like we don't properly parse the path because we're lacking GetPathComponent.

https://github.com/ImageMagick/ImageMagick/blob/626a27b7ba3ae0d975e27a546855e3302756ce87/MagickCore/utility.c#L1198-L1361

hhvm/hphp/runtime/ext/imagick/ext_imagick.cpp

Lines 98 to 113 in df46f65

	if (isMagickPseudoFormat(path, 'R')) {
	realpath = path;
	} else {
	auto var = HHVM_FN(realpath)(path);
	realpath = var.isString() ? var.toString() : String();
	if (realpath.empty() ||
	!HHVM_FN(is_file)(realpath) ||
	!HHVM_FN(is_readable)(realpath)) {
	realpath.reset();
	}
	}
	if (realpath.empty()) {
	IMAGICK_THROW("Invalid filename provided");
	}
	auto status = op(wand, path.c_str());

[xoref]

Would like to know if there's any progress on this issue. WordPress 4.7 introduced enhanced PDF support by automatically trying to generate a thumbnail of the first page of a PDF file. This fails on HHVM because of this issue.
There's a workaround by using fopen() to open the PDF file and then passing the resource to the readImageFile method of Imagick.

[Swahvay]

Just ran into this issue from one of my users as well. (HHVM 3.30.0). Referencing the workaround here: https://stackoverflow.com/questions/28286358/receiving-invalid-filename-error-when-converting-first-page-of-pdf-to-jpg

[Swahvay]

Actually, the workaround doesn't work for me either. Only happens with PDFs.