# PowerShell script file to be executed as a AWS Lambda function.
# When executing in Lambda the following variables will be predefined.
# $LambdaInput - A PSObject that contains the Lambda function input data.
# $LambdaContext - An Amazon.Lambda.Core.ILambdaContext object that contains information about the currently running Lambda environment.
# The last item in the PowerShell pipeline will be returned as the result of the Lambda function.
# To include PowerShell modules with your Lambda function, like the AWS.Tools.S3 module, add a "#Requires" statement
# indicating the module and version. If using an AWS.Tools.* module the AWS.Tools.Common module is also required.
# The following link contains documentation describing the structure of the S3 event object.
# https://docs.aws.amazon.com/AmazonS3/latest/dev/notification-content-structure.html
# This example demonstrates how to process an S3 Event that follows the process:
# S3 Event -> SNS Topic -> Lambda Function

#Requires -Modules @{ModuleName='AWS.Tools.Common';ModuleVersion=''}
#Requires -Modules @{ModuleName='AWS.Tools.S3';ModuleVersion=''}

# Uncomment to send the input event to CloudWatch Logs
# Write-Host (ConvertTo-Json -InputObject $LambdaInput -Compress -Depth 5)

foreach ($snsRecord in $LambdaInput.Records)
    $snsMessage = ConvertFrom-Json -InputObject $snsRecord.Sns.Message
    foreach ($s3Event in $snsMessage.Records)
        $bucket = $s3Event.s3.bucket.name
        $key = $s3Event.s3.object.key

        Write-Host "Processing event for: bucket = $bucket, key = $key"

        # TODO: Add logic to handle S3 event record, for example
        $obj = Get-S3Object -Bucket $bucket -Key $key
        Write-Host "Object $key is $($obj.Size) bytes"