How to automate visualization of S3 objects by using Lambda? - amazon-web-services

Question

The thing is that I have these objects in my S3 bucket (email) and I want to be able to visualize them since they're not that easy to open them and if you want to you need to manually do it. I was told there was a way to use Lambda function with S3 to be able to create a some kind of html view page to see the objects.
Hope someone can help me do that.

Answer 1

Based on what you have provided, Here's what I understand.
You've email(s) in S3
You want to visualize/read them via website
There are many ways to do it. Simplest of all is using s3's public hosting capability. See this AWS doc for step by step details.
This example assumes your email is in .txt format. If you have any other formt (e.g. pdf / eml etc) you will need corresponding parser library and logic to open and read those. In that case this example may not work. you may want to look at other aws options such as aws lightsail or aws amplify, It will depend on your requirements.
Based on AWS doc, Here's what you can do at a high-level.
Create a basic index.html and upload to s3 folder.
Create a basic error.html and upload to your s3 folder.
Under bucket URL -> properties edit and enable 'Static Website Hosting'
e.g. https://s3.console.aws.amazon.com/s3/buckets/yours3bucket?region=us-west-1&tab=properties
This will give you an website URL something like below.
http://yours3bucket.s3-website-us-west-1.amazonaws.com
Under bucket URL -> permissions , UnCheck "Block all public access".
[ caution: this will open your s3 bucket to the world. For better access control, consider using IAM ]
Add a bucket policy.
[This example shows policy to enable access to anyone. you should consider restricting to certain users using IAM]
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "PublicRead",
"Effect": "Allow",
"Principal": "*",
"Action": [
"s3:GetObject",
"s3:GetObjectVersion"
],
"Resource": "arn:aws:s3:::yours3bucket/*"
}
]
}
After that, simply launch your static website
http://yours3bucket.s3-website-us-west-1.amazonaws.com/index.html
Each of your email (assuming its in text format) should be accessible as below.
http://yours3bucket.s3-website-us-west-1.amazonaws.com/youremailobject.txt
Here's how it looks at my end