How to assign the product image programmatically form external url?

Step 1). Get the Product image from URL – create a file in Helper/Data.php

public function getProductImage($imgurl){
	 		$fileSystem = $this->_objectManager->create('\Magento\Framework\Filesystem');
	        $mediaPath = $fileSystem->getDirectoryRead(\Magento\Framework\App\Filesystem\DirectoryList::MEDIA)->getAbsolutePath();
	        if (!file_exists($mediaPath.'imagefolder')) {
	            mkdir($mediaPath.'imagefolder', 0777, true);
	        }
	        $url = $imgurl;
	        $ch = curl_init($url);
	        $my_save_dir = $mediaPath.'imagefolder/';
	        $filename = basename($url);
	        $complete_save_loc = $my_save_dir . $filename;
	        $fp = fopen($complete_save_loc, 'wb');
	        curl_setopt($ch, CURLOPT_FILE, $fp);
	        curl_setopt($ch, CURLOPT_HEADER, 0);
	        curl_setopt($ch, CURLOPT_TIMEOUT, 28800);
	        $return = curl_exec($ch);
	        curl_close($ch);
	        $image = $return;
        	return $image;
        }

public function getProductImage($imgurl){

$fileSystem = $this->_objectManager->create('\Magento\Framework\Filesystem');

$mediaPath = $fileSystem->getDirectoryRead(\Magento\Framework\App\Filesystem\DirectoryList::MEDIA)->getAbsolutePath();

if (!file_exists($mediaPath.'imagefolder')) {

mkdir($mediaPath.'imagefolder', 0777, true);

}

$url = $imgurl;

$ch = curl_init($url);

$my_save_dir = $mediaPath.'imagefolder/';

$filename = basename($url);

$complete_save_loc = $my_save_dir . $filename;

$fp = fopen($complete_save_loc, 'wb');

curl_setopt($ch, CURLOPT_FILE, $fp);

curl_setopt($ch, CURLOPT_HEADER, 0);

curl_setopt($ch, CURLOPT_TIMEOUT, 28800);

$return = curl_exec($ch);

curl_close($ch);

$image = $return;

return $image;

}

Step 2). Assign the images to existing products.

$product = $this->productFactory->create()->load($proid);
	$getimgurl = $url;
	$imagename= basename($getimgurl);
	$imgpath = $mediaPath.'imagefolder/'.$imagename;
	if (!file_exists($imgpath)) { //check image already exist in directory
	    $this->helperData->getProductImage($getimgurl);
	}
$product->addImageToMediaGallery($imgpath, array('image', 'small_image', 'thumbnail','media_gallery'), false, false);
$product->save();

$product = $this->productFactory->create()->load($proid);

$getimgurl = $url;

$imagename= basename($getimgurl);

$imgpath = $mediaPath.'imagefolder/'.$imagename;

if (!file_exists($imgpath)) { //check image already exist in directory

$this->helperData->getProductImage($getimgurl);

}

$product->addImageToMediaGallery($imgpath, array('image', 'small_image', 'thumbnail','media_gallery'), false, false);

$product->save();

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