Save Image Using Observer Or Model

Question

I want to upload and save image using observer or model.
How can I do that?

$imageAdapter = $objectManager->get('Magento\Framework\Image\AdapterFactory')->create();

$uploader->addValidateCallback($po_file, $imageAdapter, 'validateUploadFile');
$uploader->setAllowRenameFiles(true);
$uploader->setFilesDispersion(true);

/** @var \Magento\Framework\Filesystem\Directory\Read $mediaDirectory */
$mediaDirectory = $objectManager->get('Magento\Framework\Filesystem')->getDirectoryRead(DirectoryList::MEDIA);
$result = $uploader->save($mediaDirectory->getAbsolutePath('customer/senapro'));
$a= $result['file'];
print_r($a);

this code not working

Answer 1

Assuming that you are uploading the image from a Form, you can save the image using a controller:

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Backend\App\Action;

class Upload extends \Magento\Framework\App\Action\Action
{     
   protected $_fileUploaderFactory;

public function __construct(
        \Magento\MediaStorage\Model\File\UploaderFactory $fileUploaderFactory,
        Action\Context $context

    ) {

        $this->_fileUploaderFactory = $fileUploaderFactory;
        parent::__construct($context);
    }

    public function execute(){

        $uploader = $this->_fileUploaderFactory->create(['fileId' => 'image']);

        $uploader->setAllowedExtensions(['jpg', 'jpeg', 'gif', 'png']);

        $uploader->setAllowRenameFiles(false);

        $uploader->setFilesDispersion(false);

        $path = $this->_filesystem->getDirectoryRead(DirectoryList::MEDIA)

        ->getAbsolutePath('images/');

        $uploader->save($path);

    }
}

If you want to reuse the code, you can move this to a model and call it in your controller.