File Upload opens file in write mode

[sparchatus]

When uploading a file it is opened read/write. This causes a permission error when the web server has read only access to the file.

yii2-mongodb/src/file/Upload.php

Lines 175 to 186 in 837c14c

	public function addFile($filename)
	{
	if ($this->filename === null) {
	$this->filename = basename($filename);
	}
	$stream = fopen($filename, 'r+');
	if ($stream === false) {
	throw new InvalidParamException("Unable to read file '{$filename}'");
	}
	return $this->addStream($stream);
	}

[samdark]

Looks like a bug. I see no reason to open it for reading in this case.