Serverless Functions Collection

A curated collection of Python-based AWS Lambda functions designed to solve real-world cloud automation and DevOps problems.

Each folder in this repository contains a self-contained function with its own logic, intended to be deployed to the AWS Serverless environment.

Function Library

1. S3 to Slack Notifier (The "Serverless Drop-Box")

Location: S3-Slack-Notifier/lambda_function.py

A secure, event-driven notification system that bridges AWS S3 and Slack. It instantly alerts a team channel whenever a new file is uploaded to a specific S3 bucket.

Key Features:

• Event-Driven: Triggered automatically by S3 ObjectCreated events.
• Secure Sharing: Generates a temporary Presigned URL (valid for 1 hour) so users can download private files without public bucket access.
• Smart Decoding: Automatically handles URL-encoded filenames (e.g., Team+Photo.jpg -> Team Photo.jpg) to prevent broken links.
• Ops-Friendly: Uses Environment Variables for webhook security and includes robust error handling for "test" events.

Architecture:

User Uploads File -> S3 Bucket -> Lambda Trigger -> Generate Presigned URL -> Post to Slack Webhook

---

How to Use

1. Clone the repo:

   git clone [https://github.com/shakeelsaga/Serverless-Functions-Collection.git](https://github.com/shakeelsaga/Serverless-Functions-Collection.git)

2. Select a function: Navigate to the specific folder.
3. Deploy: Copy the code into the AWS Lambda Console (Python 3.x runtime).
4. Configure: Set the required Environment Variables (documented in the code comments).

Tech Stack

• Runtime: Python 3.9+
• AWS SDK: Boto3 (Core integration)
• Libraries: urllib (Standard library for lightweight HTTP requests)

Contributing

I am actively adding new automation patterns to this repository. If you have a suggestion for a useful Lambda function, feel free to open an issue or pull request!

License

MIT License