Python + AWS

I need someone to develop a simple Python REST API function (deployed using AWS Lambda and API gateway) that reads a txt file stored in AWS S3 and check if the file contains a specific keyword.

Input
- S3 Bucket Name
- S3 File Unique ID
- Keyword

Output
- True/False (depending on whether the keyword was found)

Deliverables
- Source Code
- Instructions to setup the API in our AWS environment