# AWS S3 to AWS SNS 

Sends notifications from S3 to SNS when an object is created.

Learn more about this pattern at Serverless Land Patterns: [https://serverlessland.com/patterns/s3-lambda](https://serverlessland.com/patterns/s3-lambda)

Important: this application uses various AWS services and there are costs associated with these services after the Free Tier usage - please see the [AWS Pricing page](https://aws.amazon.com/pricing/) for details. You are responsible for any AWS costs incurred. No warranty is implied in this example.

## Requirements

* [Create an AWS account](https://portal.aws.amazon.com/gp/aws/developer/registration/index.html) if you do not already have one and log in. The IAM user that you use must have sufficient permissions to make necessary AWS service calls and manage AWS resources.
* [AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2.html) installed and configured
* [Git Installed](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
* [AWS Serverless Application Model](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html) (AWS SAM) installed

## Deployment Instructions

1. Create a new directory, navigate to that directory in a terminal and clone the GitHub repository:
    ``` 
    git clone https://github.com/aws-samples/serverless-patterns
    ```
1. Change directory to the pattern directory:
    ```
    cd s3-sns
    ```
1. From the command line, use AWS SAM to build and deploy the AWS resources for the pattern as specified in the template.yml file:
    ```
    sam build
    sam deploy --guided
    ```
1. During the prompts:
    * Enter a stack name
    * Enter the desired AWS Region
    * Enter a bucket name
    * Allow SAM CLI to create IAM roles with the required permissions.

    Once you have run `sam deploy -guided` mode once and saved arguments to a configuration file (samconfig.toml), you can use `sam deploy` in future to use these defaults.

1. Note the outputs from the SAM deployment process. These contain the resource names and/or ARNs which are used for testing.

## How it works

This SAM template creates an S3 bucket, allows you to upload objects to that bucket, and will send you notifications from S3 to SNS when an object is created in that bucket. You must create a subscription from the SNS console first. 

==============================================

## Testing

* Go to the SNS Console and select the topic that was created after running `sam deploy`
* Click on Create Subscription
* Under Protocol, select the type of endpoint to subscribe to (email, SMS, etc.)
* Confirm the message subscription
* Upload an object to the S3 bucket you created
* Check your notifications


## Cleanup
 
1. Delete the stack
    ```bash
    aws cloudformation delete-stack --stack-name STACK_NAME
    ```
1. Confirm the stack has been deleted
    ```bash
    aws cloudformation list-stacks --query "StackSummaries[?contains(StackName,'STACK_NAME')].StackStatus"
    ```
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