How do I get the file URI from an EntityMetadataWrapper object?

Question

Getting hold of file objects related to nodes through a field is easy using an EntityMetadataWrapper:

$wrapper = entity_metadata_wrapper('node', $node);
$images = $wrapper->field_images;

So that's great. However, I want to use some of the properties of the standard file object, and they're not available. When I look at the properties available on $images[0]->file using the above code, I see these:

• fid
• name
• mime
• size
• url
• timestamp
• owner

Most notably, uri is missing, and in its place there's a url property, which is the full external URL to the image file. I want to manipulate these images via their URI (create thumbs, etc), so I'm left doing this:

$fid = $images[0]->file->fid->value();
$uri = file_load($fid)->uri;

Which seems to negate the whole point of using an EntityMetadataWrapper in the first place.

What am I missing? Where is the URI on the wrapped file object? If it's not available, for the love of all things good and pure, why not?!

I'm aware I could deconstruct the URL back to a URI, but that also feels very unnecessary.

Answer 1

Big thanks to MPD for pointing me in the right direction. In short, without the File Entity module, files aren't entities, so they don't naturally have the 'properties' I was expecting.

The Entity module provides some on their behalf, but URI isn't one of them. Fortunately it's very simple to make it available using hook_entity_property_info_alter() and a custom property callback:

function MYMODULE_entity_property_info_alter(&$info) {
  $info['file']['properties']['uri'] = array(
    'label' => t("URI"),
    'description' => t("The URI of the file."),
    'getter callback' => 'MYMODULE_entity_get_file_properties',
    'schema field' => 'uri',
  );
}

function MYMODULE_entity_get_file_properties($file, array $options, $name) {
  switch ($name) {
    case 'uri':
      return $file->uri;
      break;
  }
}

After that, $images[0]->file->uri->value() is available as expected.

Answer 2

Below works without the hack:

 $node_wrapper->field_media[0]->value()['uri'];

Answer 3

This is what works for me to get the full path of a single image...

// wrap it
$wrapper = entity_metadata_wrapper('node', node_load(16));
// get the value
$image = $wrapper->field_image->value();
// check it
if ($image) {
   // get the full path
   $path = file_create_url($image['uri']);
}
print_r($path);

Alternatively...

  $image = $wrapper->field_image->value();
  $image_path = $image ? file_create_url($image['uri']) : '';