finlabsindia/wp-content/plugins/jetpack/json-endpoints/class.wpcom-json-api-update-media-endpoint.php

<?php

new WPCOM_JSON_API_Update_Media_Endpoint( array(
	'description' => 'Edit basic information about a media item.',
	'group'       => 'media',
	'stat'        => 'media:1:POST',
	'method'      => 'POST',
	'path'        => '/sites/%s/media/%d',
	'deprecated'  => true,
	'max_version' => '1',
	'new_version' => '1.1',
	'path_labels' => array(
		'$site'    => '(int|string) Site ID or domain',
		'$media_ID' => '(int) The ID of the media item',
	),

	'request_format' => array(
		'title'       => '(string) The file name.',
		'caption'     => '(string) File caption.',
		'description' => '(HTML) Description of the file.',
	),

	'response_format' => array(
		'id'          => '(int) The ID of the media item',
		'date'        =>  '(ISO 8601 datetime) The date the media was uploaded',
		'parent'      => '(int) ID of the post this media is attached to',
		'link'        => '(string) URL to the file',
		'title'       => '(string) File name',
		'caption'     => '(string) User provided caption of the file',
		'description' => '(string) Description of the file',
		'metadata'    => '(array) Array of metadata about the file, such as Exif data or sizes',
	),
	'example_request'      => 'https://public-api.wordpress.com/rest/v1.1/sites/82974409/media/446',
	'example_request_data' =>  array(
		'headers' => array(
			'authorization' => 'Bearer YOUR_API_TOKEN'
		),
		'body' => array(
			'title' => 'Updated Title'
		)
	)
) );

class WPCOM_JSON_API_Update_Media_Endpoint extends WPCOM_JSON_API_Endpoint {
	function callback( $path = '', $blog_id = 0, $media_id = 0 ) {
		$blog_id = $this->api->switch_to_blog_and_validate_user( $this->api->get_blog_id( $blog_id ) );
		if ( is_wp_error( $blog_id ) ) {
			return $blog_id;
		}

		if ( !current_user_can( 'upload_files', $media_id ) ) {
			return new WP_Error( 'unauthorized', 'User cannot view media', 403 );
		}

		$item = $this->get_media_item( $media_id );

		if ( is_wp_error( $item ) ) {
			return new WP_Error( 'unknown_media', 'Unknown Media', 404 );
		}

		$input = $this->input( true );
		$insert = array();

		if ( !empty( $input['title'] ) ) {
			$insert['post_title'] = $input['title'];
		}

		if ( !empty( $input['caption'] ) )
			$insert['post_excerpt'] = $input['caption'];

		if ( !empty( $input['description'] ) )
			$insert['post_content'] = $input['description'];

		$insert['ID'] = $media_id;
		wp_update_post( (object) $insert );

		$item = $this->get_media_item( $media_id );
		return $item;
	}
}