AWS SDK S3 Examples: Upload, Download, Presigned URLs आणि Multipart (Python, PHP, Node.js)

By Ravindra Bagale, trainer · LinkedIn · Last updated: 24 October 2026

1. मोठं चित्र: locker room

हे का लागतं?

Gym प्रत्येक member ला नंबर असलेला locker देतो. बॅग ठेवा, काढा, किंवा मित्राला 10 मिनिटं चालणारा one-time pass द्या. S3 म्हणजे locker room: bucket = room, key = locker नंबर, object = बॅग, presigned URL = one-time pass.

हे काय आहे?

Python चं upload_file/download_file multipart आपोआप करतं. PHP मध्ये putObject आणि MultipartUploader. Node मध्ये PutObjectCommand आणि @aws-sdk/lib-storage मधला Upload class.

कसं करायचं (step by step)

2. Bucket बनवा आणि upload

हे का लागतं?

Aisha ला प्रत्येक client photo shoot एका laptop वर नाही, safe ठिकाणी हवा.

हे काय आहे?

us-east-1 सोडून LocationConstraint द्यावा लागतो. ContentType द्या म्हणजे browser image download न करता दाखवतो.

कसं करायचं (step by step)

1. Python: bucket बनवून file upload.

import boto3

s3 = boto3.client("s3", region_name="me-central-1")
bucket = "aisha-studio-111122223333"
s3.create_bucket(Bucket=bucket, CreateBucketConfiguration={"LocationConstraint": "me-central-1"})
s3.upload_file("shoot-01.jpg", bucket, "2026/oct/shoot-01.jpg", ExtraArgs={"ContentType": "image/jpeg"})
print("Uploaded to", bucket)

अपेक्षित output:

Uploaded to aisha-studio-111122223333

2. PHP: file path ने putObject.

<?php
require "vendor/autoload.php";
use Aws\S3\S3Client;

$s3 = new S3Client(["region" => "ap-south-1"]);
$bucket = "ravi-prints-nashik-111122223333";
$s3->createBucket(["Bucket" => $bucket, "CreateBucketConfiguration" => ["LocationConstraint" => "ap-south-1"]]);
$s3->waitUntil("BucketExists", ["Bucket" => $bucket]);
$r = $s3->putObject(["Bucket" => $bucket, "Key" => "orders/inv-1001.pdf", "SourceFile" => "inv-1001.pdf", "ContentType" => "application/pdf"]);
echo "ETag: ", $r["ETag"], PHP_EOL;

अपेक्षित output:

ETag: "9b2cf535f27731c974343645a3985328"

3. Node.js: file stream सह PutObjectCommand.

import { S3Client, PutObjectCommand } from "@aws-sdk/client-s3";
import { createReadStream, statSync } from "node:fs";

const s3 = new S3Client({ region: "eu-central-1" });
const r = await s3.send(new PutObjectCommand({
  Bucket: "lena-cafe-berlin-111122223333",
  Key: "menu/autumn.png",
  Body: createReadStream("autumn.png"),
  ContentLength: statSync("autumn.png").size,
  ContentType: "image/png",
}));
console.log("ETag:", r.ETag);

अपेक्षित output:

ETag: "5d41402abc4b2a76b9719d911017c592"

4. Verify: object आहे.

aws s3 ls s3://aisha-studio-111122223333/2026/oct/

अपेक्षित output:

2026-10-24 10:15:02     245760 shoot-01.jpg

3. Download आणि list

हे का लागतं?

Ravi ला invoice PDF परत shop PC वर हवी, आणि October च्या सगळ्या orders ची list.

हे काय आहे?

GetObject stream देतो. Prefix folder सारखं filter करतो. 1,000 पेक्षा जास्त keys असतील तर paginator.

कसं करायचं (step by step)

1. Python: download आणि prefix ने list.

import boto3

s3 = boto3.client("s3", region_name="ap-south-1")
b = "ravi-prints-nashik-111122223333"
s3.download_file(b, "orders/inv-1001.pdf", "copy-inv-1001.pdf")
for o in s3.list_objects_v2(Bucket=b, Prefix="orders/").get("Contents", []):
    print(o["Key"], o["Size"])

अपेक्षित output:

orders/inv-1001.pdf 48213

2. PHP: SaveAs सह getObject.

<?php
require "vendor/autoload.php";
$s3 = new Aws\S3\S3Client(["region" => "ap-south-1"]);
$b = "ravi-prints-nashik-111122223333";
$s3->getObject(["Bucket" => $b, "Key" => "orders/inv-1001.pdf", "SaveAs" => "copy-inv-1001.pdf"]);
foreach ($s3->listObjectsV2(["Bucket" => $b, "Prefix" => "orders/"])["Contents"] as $o) {
    echo $o["Key"], " ", $o["Size"], PHP_EOL;
}

अपेक्षित output:

orders/inv-1001.pdf 48213

3. Node.js: body string म्हणून वाचा.

import { S3Client, PutObjectCommand, GetObjectCommand, ListObjectsV2Command } from "@aws-sdk/client-s3";

const s3 = new S3Client({ region: "eu-central-1" });
const B = "lena-cafe-berlin-111122223333";
await s3.send(new PutObjectCommand({ Bucket: B, Key: "menu/today.txt", Body: "Apfelstrudel €4.50" }));
const obj = await s3.send(new GetObjectCommand({ Bucket: B, Key: "menu/today.txt" }));
console.log(await obj.Body.transformToString());
const list = await s3.send(new ListObjectsV2Command({ Bucket: B, Prefix: "menu/" }));
console.log(list.Contents.map(o => o.Key));

अपेक्षित output:

Apfelstrudel €4.50
[ 'menu/autumn.png', 'menu/today.txt' ]

4. Verify: download केलेली file जुळते.

ls -l copy-inv-1001.pdf | awk '{print $5}'

अपेक्षित output:

48213

4. Presigned URLs

हे का लागतं?

Aisha चा New York मधला client 40 photos download करणार, पण bucket private राहायला हवा. Presigned URL AWS login शिवाय ठराविक वेळेसाठी access देतो.

हे काय आहे?

SDK तुमच्या credentials ने URL locally sign करतो. GET URL ने download; PUT URL ने browser थेट S3 मध्ये upload, तुमच्या server मधून न जाता.

कसं करायचं (step by step)

1. Python: 1 तासाची download link.

import boto3

s3 = boto3.client("s3", region_name="me-central-1")
url = s3.generate_presigned_url(
    "get_object",
    Params={"Bucket": "aisha-studio-111122223333", "Key": "2026/oct/shoot-01.jpg"},
    ExpiresIn=3600,
)
print(url[:80])

अपेक्षित output:

https://aisha-studio-111122223333.s3.me-central-1.amazonaws.com/2026/oct/shoot-0

2. PHP: createPresignedRequest.

<?php
require "vendor/autoload.php";
$s3 = new Aws\S3\S3Client(["region" => "ap-south-1"]);
$cmd = $s3->getCommand("GetObject", ["Bucket" => "ravi-prints-nashik-111122223333", "Key" => "orders/inv-1001.pdf"]);
$req = $s3->createPresignedRequest($cmd, "+15 minutes");
echo (string) $req->getUri(), PHP_EOL;

अपेक्षित output:

https://ravi-prints-nashik-111122223333.s3.ap-south-1.amazonaws.com/orders/inv-1001.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&...&X-Amz-Expires=900&X-Amz-Signature=...

3. Node.js: browser upload साठी presigned PUT URL.

// npm install @aws-sdk/s3-request-presigner
import { S3Client, PutObjectCommand } from "@aws-sdk/client-s3";
import { getSignedUrl } from "@aws-sdk/s3-request-presigner";

const s3 = new S3Client({ region: "eu-central-1" });
const url = await getSignedUrl(s3, new PutObjectCommand({
  Bucket: "lena-cafe-berlin-111122223333", Key: "uploads/review.jpg", ContentType: "image/jpeg",
}), { expiresIn: 600 });
console.log(url.split("?")[0]);

अपेक्षित output:

https://lena-cafe-berlin-111122223333.s3.eu-central-1.amazonaws.com/uploads/review.jpg

4. Verify: AWS login शिवाय curl ने download.

curl -s -o test.jpg -w "%{http_code}\n" "$URL"

अपेक्षित output:

200

5. Verify: PUT URL ने upload.

curl -s -X PUT -H "Content-Type: image/jpeg" --data-binary @review.jpg -w "%{http_code}\n" "$PUT_URL"

अपेक्षित output:

200

5. मोठ्या files साठी multipart upload

हे का लागतं?

Sydney मधला James 3 GB wedding video upload करतो. एक PUT 5 GB पर्यंतच, आणि एक network blip सगळं परत सुरू करतं. Multipart parts parallel पाठवतो आणि फक्त fail झालेला part retry करतो.

हे काय आहे?

Parts किमान 5 MB (शेवटचा सोडून), जास्तीत जास्त 10,000 parts. High-level helpers create, parts upload आणि complete आपोआप करतात.

कसं करायचं (step by step)

1. Python: TransferConfig threshold आणि threads ठरवतो.

import boto3
from boto3.s3.transfer import TransferConfig

cfg = TransferConfig(multipart_threshold=64 * 1024 * 1024, multipart_chunksize=64 * 1024 * 1024, max_concurrency=8)
s3 = boto3.client("s3", region_name="ap-southeast-2")
s3.upload_file("wedding.mp4", "james-films-sydney-111122223333", "raw/wedding.mp4", Config=cfg)
head = s3.head_object(Bucket="james-films-sydney-111122223333", Key="raw/wedding.mp4")
print("ETag:", head["ETag"])

अपेक्षित output:

ETag: "d41d8cd98f00b204e9800998ecf8427e-48"

2. PHP: MultipartUploader.

<?php
require "vendor/autoload.php";
use Aws\S3\MultipartUploader;
use Aws\Exception\MultipartUploadException;

$s3 = new Aws\S3\S3Client(["region" => "ap-southeast-2"]);
$up = new MultipartUploader($s3, "wedding.mp4", ["bucket" => "james-films-sydney-111122223333", "key" => "raw/wedding.mp4", "part_size" => 64 * 1024 * 1024, "concurrency" => 5]);
try {
    $r = $up->upload();
    echo "Done: ", $r["ObjectURL"], PHP_EOL;
} catch (MultipartUploadException $e) {
    echo "Failed: ", $e->getMessage(), PHP_EOL;
}

अपेक्षित output:

Done: https://james-films-sydney-111122223333.s3.ap-southeast-2.amazonaws.com/raw/wedding.mp4

3. Node.js: progress सह @aws-sdk/lib-storage चा Upload.

// npm install @aws-sdk/lib-storage
import { S3Client } from "@aws-sdk/client-s3";
import { Upload } from "@aws-sdk/lib-storage";
import { createReadStream } from "node:fs";

const up = new Upload({
  client: new S3Client({ region: "ap-southeast-2" }),
  params: { Bucket: "james-films-sydney-111122223333", Key: "raw/wedding.mp4", Body: createReadStream("wedding.mp4") },
  partSize: 64 * 1024 * 1024, queueSize: 4,
});
up.on("httpUploadProgress", p => console.log("part", p.part, p.loaded));
const r = await up.done();
console.log("Done:", r.Key);

अपेक्षित output:

part 1 67108864
part 2 134217728
...
Done: raw/wedding.mp4

4. Verify: ETag शेवटी -partcount, अर्धवट uploads नाहीत.

aws s3api head-object --bucket james-films-sydney-111122223333 --key raw/wedding.mp4 --query ETag --output text
aws s3api list-multipart-uploads --bucket james-films-sydney-111122223333 --query "length(Uploads || `[]`)"

अपेक्षित output:

"d41d8cd98f00b204e9800998ecf8427e-48"
0

6. हाच call Java, Go, .NET आणि CLI मध्ये

हे का लागतं?

Teams अनेकदा भाषा मिसळतात. Python, PHP आणि Node.js मध्ये call समजला की बाकीचे SDKs म्हणजे तोच API, फक्त syntax वेगळा.

हे काय आहे?

सगळे PutObject API call करतात. Terminal मधून पटकन test करायला CLI ओळ वापरा.

कसं करायचं (step by step)

7. काहीही खर्च चालू राहू नये म्हणून cleanup

हे का लागतं?

चालू ठेवलेले lab resources पैसे खातात आणि security risk बनतात.

हे काय आहे?

उलट्या क्रमाने delete करा: आधी children, मग parents.

कसं करायचं (step by step)

1. Python: bucket रिकामा करून delete.

import boto3
b = boto3.resource("s3").Bucket("aisha-studio-111122223333")
b.objects.all().delete()
b.delete()
print("deleted")

अपेक्षित output:

deleted

2. अर्धवट multipart uploads abort करा.

aws s3api list-multipart-uploads --bucket james-films-sydney-111122223333 --query "Uploads[].[Key,UploadId]" --output text

अपेक्षित output:

(no output means success)

8. मुलाखत प्रश्न आणि उत्तरं

उजळणी, तुलना आणि मुलाखत cards

हा lesson काही मिनिटांत revise करा. Cards phone वर save करा किंवा PNG download करा. प्रत्येक card वरचा QR हा lesson उघडतो.

अजून cards: Ravi Sir's Cards.