How to get absolute path to asset file?

Question

I have some csv files uploaded as assets and now I need to fopen() them from my plugin.

I have an AssetFileModel but I have not been able to work out how to construct a full path to the file.

I can access the filename like: $asset->filename which gives me my_csv_file.csv but this is not enough for fopen() to find it.

How can I get the absolute path to the asset file?

Or at least a path that I can use with fopen() to find the file?

Answer 1

You can get the rest of the path from your asset's source and folder, I think something like this should do it:

$source = $asset->getSource();

if ($source->type != 'Local')
{
    throw new Exception(Craft::t('Paths not available for non-local asset sources'));
}

$sourcePath = $source->settings['path'];
$folderPath = $asset->getFolder()->path;

$assetFilePath = $sourcePath.$folderPath.$asset->filename;

Answer 2

Update for Craft 3:

To get the same output as Mike's path above, you can use:

$volumePath = $asset->getVolume()->settings['path'];
$folderPath = $asset->getFolder()->path;
$assetFilePath = Yii::getAlias($volumePath) . $folderPath . $asset->filename;

Answer 3

Here is an approach in Craft 4. This approach assumes you have an asset element (craft\elements\Asset).

use Craft;
//$asset = craft\elements\Asset;
$fsPath = Craft::getAlias($asset->getVolume()->fs->path);
$attachment = $fsPath . DIRECTORY_SEPARATOR . $asset->getPath();

Answer 4

See Asset::getImageTransformSourcePath() for how Craft CMS resolves the real local path. (https://github.com/craftcms/cms/blob/develop/src/elements/Asset.php#L1200)

Should look something like this:

$volume = $this->getVolume();
$assetFilePath = $volume instanceof LocalVolumeInterface
  ? FileHelper::normalizePath($volume->getRootPath() . DIRECTORY_SEPARATOR . $this->getPath())
  : null;