Downlaod and Upload Data From S3 From Mobile App

• App Functioning
• Using AWS S3 to Store Static Assets and File Uploads

Using AWS S3 to Shop Static Avails and File Uploads

English — 日本語に切り替える

Final updated February xv, 2022

Tabular array of Contents

• Overview
• Setting Upwards S3 for Your Heroku App
• Manually Uploading Static Assets
• Uploading Files From a Heroku App
• Language-Specific Guides
• Referring to Your Assets

Amazon Simple Storage Service (S3) is a durable and available store, ideal for storing application content like media files, static assets, and user uploads.

Storing static files elsewhere is crucial for Heroku apps since dynos have an ephemeral filesystem. Whenever you supervene upon a dyno or when it restarts, which happens daily, all files that aren't part of your application's slug are lost. Use a storage solution like S3 to offload the storage of static files from your app.

To add S3 to your app without creating an AWS account, see the Bucketeer add-on.

Overview

All files sent to S3 become stored in a bucket. Buckets act as a top-level container, much like a directory, and its proper noun must be unique beyond all of S3. A unmarried bucket typically stores the files, assets, and uploads for an application. An Access Cardinal ID and a Cloak-and-dagger Admission Key govern access to the S3 API.

Setting Upwardly S3 for Your Heroku App

Enabling an application to use S3 requires that the application take access to your AWS credentials and the name of the bucket to store files.

Configure Credentials

You can find your S3 credentials in My Security Credentials section of AWS.

Never commit your S3 credentials to version control. Set them in your config vars instead.

Use the heroku config:gear up to set both keys:

            $ heroku config:set AWS_ACCESS_KEY_ID=MY-ACCESS-ID AWS_SECRET_ACCESS_KEY=MY-ACCESS-KEY Adding config vars and restarting app... done, v21   AWS_ACCESS_KEY_ID     => MY-Admission-ID   AWS_SECRET_ACCESS_KEY => MY-Access-KEY                      

Name Your Bucket

Create your S3 bucket in the same region every bit your Heroku app to accept advantage of AWS's free in-region data transfer rates.

To create a saucepan, access the S3 section of the AWS Management Panel and create a new bucket in the US Standard region:

Follow AWS' saucepan naming rules to ensure maximum interoperability.

Store the bucket proper noun in a config var to give your awarding access to its value:

            $ heroku config:gear up S3_BUCKET_NAME=instance-app-avails Adding config vars and restarting app... done, v22   S3_BUCKET_NAME     => example-app-assets                      

Manually Uploading Static Assets

You can manually add static assets such as videos, PDFs, Javascript, CSS, and image files using the command line or the Amazon S3 console.

Uploading Files From a Heroku App

There are ii approaches to processing and storing file uploads from a Heroku app to S3: direct and pass-through. See the language guides for specific instructions.

Direct Uploads

In a direct upload, a file uploads to your S3 bucket from a user's browser, without starting time passing through your app. Although this method reduces the amount of processing your application needs to perform, information technology can exist more complex to implement. It also limits the ability to modify files before storing them in S3.

Pass-Through Uploads

In a laissez passer-through upload, a file uploads to your app, which in plow uploads it to S3. This method enables you to perform preprocessing on user uploads before you push them to S3. Depending on your chosen language and framework, this method tin can cause latency issues for other requests while the upload takes place. Use background workers to process uploads to gratuitous up your app.

Information technology'south recommended to use background workers for uploading files. Big files uploads in unmarried-threaded, non-evented environments, like Rail, cake your application's web dynos and tin cause request timeouts. EventMachine, Node.js and JVM-based languages are less susceptible to such bug.

Language-Specific Guides

Here are linguistic communication-specific guides to handling uploads to S3:

Language/Framework	Tutorials
Ruby/Rails	Direct to S3 Image Uploads in Rails
Node.js	Direct to S3 File Uploads in Node.js
Python	Directly to S3 File Uploads in Python
Java	Uploading Files to S3 in Java with Play 2
PHP	Uploading Files to S3 in PHP

Referring to Your Assets

You can utilize your avails' public URLs, such as http://s3.amazonaws.com/bucketname/filename, in your application'south code. S3 directly serves these files, freeing upwardly your awarding to serve merely dynamic requests.

For faster page loads, consider using a content commitment service, such as Amazon Cloudfront to serve your static assets instead.

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Source: https://devcenter.heroku.com/articles/s3

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