Amazon S3 - How to perform CRUD operations? - php

Question

I'm using backbonejs for my project. My question is, how to perform CRUD operation in amazon S3? so far I can upload/create files into bucket and retrieve files but I dont know how to do update and delete files.
config.php
<?php
//Bucket Name
$bucket_name ="my_bucket";
//include the S3 class
if (!class_exists('S3'))require_once('S3.php');
//AWS access informations
if (!defined('awsAccessKey')) define('awsAccessKey', 'access_key');
if (!defined('awsSecretKey')) define('awsSecretKey', 'secret_key');
//instantiate the s3 class
$s3 = new S3(awsAccessKey, awsSecretKey);
//this is used to create a bucket in amazon S3
$s3->putBucket($bucket_name, S3::ACL_PUBLIC_READ);
?>
upload_image.php
<?php
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST');
if(isset($_POST) && !empty($_FILES) && !empty($_FILES['uploadfile']['name']) && isset($_POST['productId'])) {
//upload file formats
$valid_file_formats = array("jpg", "png", "gif", "bmp","jpeg","PNG","JPG","JPEG","GIF","BMP");
function get_file_extension($file_name) {
return substr(strrchr($file_name,'.'),1);
}
$filename = $_FILES['uploadfile']['name'];
$tmp_filename = $_FILES['uploadfile']['tmp_name'];
$filetype = strtolower($_FILES['uploadfile']['type']);
//get file extenstion to verify the format
$extension = get_file_extension($filename);
if(in_array($extension,$valid_file_formats)){
//include config.php
include_once "config.php";
//set content type in headers inorder to display image in browser
$header = array('Content-Type' => $filetype);
//change filename
$new_file_name = "w3_".time().".".$extension;
if($s3->putObject(S3::inputFile($tmp_filename), $bucket_name , $new_file_name, S3::ACL_PUBLIC_READ, array(), $header) ){
$img = "http://".$bucket_name.".s3.amazonaws.com/".$new_file_name;
// array for JSON response
$response = array();
// check for required fields
$productId = $_POST['productId'];
$imageLink = $img;
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result = mysql_query("INSERT INTO tbl_images(productId, imageLink,dateCreated) VALUES('$productId', '$imageLink',NOW())");
// check if row inserted or not
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Image successfully uploaded.";
// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response
echo json_encode($response);
}
echo "1-".$img;
} else {
echo "2-Upload Failed";
}
} else {
echo "3-Not a Valid Format";
}
} else {
echo "4-Please Select a File";
}
?>
Thanks a lot in advance.

Answer 1

Have a look at the php sdk
http://docs.aws.amazon.com/aws-sdk-php/latest/class-Aws.S3.S3Client.html
There is commands there for deleteMatching to remove items from a bucket.
As for update, call putObject again to overwrite the file.