I need to upload static contents like image to AWS S3 and provide a link back so that image can be accessed through Cloudfront CDN (content delivery network). I am new to AWS and I read that s3 bucket is linked to CDN and I believe it's all configuration based. From java code I am able to upload to s3 and get the bucket based url back. How can I retrieve CDN url from java code for the same uploaded image. Could you please help me out here.
The AWS S3 has to be manually linked to AWS CloudFront (Image attached).
Once a Distribution is created, you can see a new domain mapped to the distribution. Using that domain name you should be able to access the CDN URL in your Java code.
Related
I want to have our server as origin for Cloud Front. When CF cannot get data in cache, then it will call REST API in our server to download the file.
I've read many CF docs but it only mentions that CF can get specific file path in server rather than REST API result.
Is it possible?
Yes this is very much possible.This is how CloudFront deliver content
After you configure CloudFront to deliver your content, here's what happens when users request your files:
A user accesses your website or application and requests one or more
files, such as an image file and an HTML file.
DNS routes the request to the CloudFront POP (edge location) that can
best serve the request—typically the nearest CloudFront POP in terms
of latency—and routes the request to that edge location.
In the POP, CloudFront checks its cache for the requested files. If
the files are in the cache, CloudFront returns them to the user. If
the files are not in the cache, it does the following:
CloudFront compares the request with the specifications in your
distribution and forwards the request for the files to your origin
server for the corresponding file type—for example, to your Amazon S3
bucket for image files and to your HTTP server for HTML files.
The origin servers send the files back to the edge location.
As soon as the first byte arrives from the origin, CloudFront begins
to forward the files to the user. CloudFront also adds the files to
the cache in the edge location for the next time someone requests
those files.
Here you can get the details how content delivery work.
Currently, We implement S3 individual file uploads by adding MD5 hashes to the upload request to validate our file transfer. But now we want to leverage AWS S3 Transfer Manager for directory upload. So, now how to check for Hashes of the folders/files uploaded?
I have scouted through the documentation available on Transfer Manager but couldn't find any information on Hashes.
I believe the SDK has already taken care of that for you. The AWS Signature Version 4 calculation includes the SHA256 of the payload. [ref]
My requirement is that, I want to upload a file into AWS S3 bucket through Spring REST api. This api should first generate a Cloudfront url and upload the file using the url generated and finally in the response I should get the complete filepath : cloudfront-url/filename.
Please let me know the steps and configuration required to achieve this.
Thank you.
If the server uploads the file from client to s3, it will create unnecessary overhead on the server. Better approach is the return pre-signed URL to client (browser) and it directly uploads to S3.
See details on how to do it here.
If that bucket is configured for cloudfront then the cloudfront url can be used directly.
See details here for setting up cloudfront for s3.
I want to send attachments (files from S3 bucket) in a mail triggered to users. How can be this done using Java?
I haven't tried though.
If file size greater then I would suggest to create presigned URL for files and share them via mail.
If files are too short in size, better to go with download and attach.
reference: https://docs.aws.amazon.com/AmazonS3/latest/dev/ShareObjectPreSignedURLJavaSDK.html
I have a website where users can upload resources (e.g. pdf-files) to their account. I am using AWS S3 to host all the uploaded files, and I am using the AWS Java SDK 1.8.9.1 for communications between my website and S3.
Now, I want to allow users to be able to download and view the files that they have uploaded, but I only want this to be possible through my website. That is, on my web site, users should have a download link for each of their files that they can click, after which the download starts. However, if they copy the URL of the download link and send it to their friend, that friend should not be able to download the file.
I know that it is possible to restrict access to S3 buckets to specified referring URLs. However, I have also been told that this can easily be forged and is not the way to go. I am thinking that there might exist a solution with signed requests.
How can I achieve this?
You could modify your application so that the download links are proxied through it. i.e. The application should do the reverse of the upload process.
So, you can provide a link to your java application, which will then go to S3 and retrieve the file and return it to the user. This way, if someone shares a link, you can protect the url and require users to login before they can download the file.