# AWS Secrets Manager Helper

A Python package that provides a simple and robust way to retrieve secrets from AWS Secrets Manager with automatic fallback to role-based authentication.

## Features

- **Dual Authentication Strategy**: Attempts direct access first, then falls back to STS role-based authentication
- **Flexible Secret Handling**: Supports both JSON string and binary secret formats
- **Error Handling**: Comprehensive error handling with meaningful error messages
- **Easy Integration**: Simple function interface that works with existing AWS configurations

## Installation

```bash
pip install sm_env_read

```

## Requirements

- Python 3.7+
- Valid AWS credentials (either through environment variables, IAM roles, or AWS CLI configuration)

## Usage

### Basic Usage

```python

from sm_env_read import get_env_secrets_from_sm

def main():
    secrets =  get_env_secrets_from_sm(
        account_id="123456789012",
        region="us-east-1",
        role_name="MySecretsRole",
        secret_name="my-app/prod/secrets"
    )
    
    # Access your secrets
    db_password = secrets.get("database_password")
    api_key = secrets.get("api_key")
    
    print(f"Retrieved {len(secrets)} secrets")

# Run the async function
main()
```

### Django Integration

```python
# settings.py
from sm_env_read import get_env_secrets_from_sm

def load_secrets():
    return  get_env_secrets_from_sm(
        account_id="123456789012",
        region="us-east-1",
        role_name="DjangoSecretsRole",
        secret_name="django/prod/secrets"
    )

# Load secrets synchronously in Django settings
secrets = load_secrets()

# Use secrets in your Django settings
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': secrets.get('db_name'),
        'USER': secrets.get('db_user'),
        'PASSWORD': secrets.get('db_password'),
        'HOST': secrets.get('db_host'),
        'PORT': secrets.get('db_port', '5432'),
    }
}

SECRET_KEY = secrets.get('django_secret_key')
```

### FastAPI Integration

```python
from fastapi import FastAPI
from sm_env_read import get_env_secrets_from_sm
import asyncio

app = FastAPI()

# Load secrets at startup
@app.on_event("startup")
def startup_event():
    app.state.secrets =  get_env_secrets_from_sm(
        account_id="123456789012",
        region="us-east-1",
        role_name="FastAPISecretsRole",
        secret_name="fastapi/prod/secrets"
    )

@app.get("/")
def root():
    # Access secrets from app state
    api_key = app.state.secrets.get("external_api_key")
    return {"message": "Hello World", "api_configured": bool(api_key)}
```

### Error Handling

```python

from sm_env_read import get_env_secrets_from_sm
from botocore.exceptions import ClientError

async def safe_get_secrets():
    try:
        secrets =  get_env_secrets_from_sm(
            account_id="123456789012",
            region="us-east-1",
            role_name="MySecretsRole",
            secret_name="my-app/prod/secrets"
        )
        return secrets
    except ClientError as e:
        error_code = e.response['Error']['Code']
        if error_code == 'SecretNotFound':
            print("Secret not found")
        elif error_code == 'AccessDenied':
            print("Access denied - check IAM permissions")
        else:
            print(f"AWS error: {error_code}")
        return {}
    except Exception as e:
        print(f"Unexpected error: {e}")
        return {}

secrets = safe_get_secrets()
```

## Authentication Methods

The function uses a linear approach to authentication:

1. **Direct Access**: Uses default AWS credentials (environment variables, IAM instance profile, or AWS CLI configuration)
2. **Role-Based Access**: If direct access fails, assumes the specified IAM role using STS

### Required IAM Permissions

For the executing environment:
```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "secretsmanager:GetSecretValue"
            ],
            "Resource": "arn:aws:secretsmanager:REGION:ACCOUNT:secret:SECRET_NAME*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "sts:AssumeRole"
            ],
            "Resource": "arn:aws:iam::ACCOUNT:role/ROLE_NAME"
        }
    ]
}
```

For the assumed role:
```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "secretsmanager:GetSecretValue"
            ],
            "Resource": "arn:aws:secretsmanager:REGION:ACCOUNT:secret:SECRET_NAME*"
        }
    ]
}
```

## Secret Format

The function expects secrets to be stored as JSON in AWS Secrets Manager:

```json
{
    "database_password": "super_secret_password",
    "api_key": "your_api_key_here",
    "encryption_key": "base64_encoded_key"
}
```

## Parameters

- **account_id** (str): AWS account ID where the secret is stored
- **region** (str): AWS region where the secret is located
- **role_name** (str): IAM role name to assume if direct access fails
- **secret_name** (str): Name of the secret in AWS Secrets Manager

## Return Value

Returns a dictionary containing the secret key-value pairs parsed from the JSON stored in AWS Secrets Manager.



## License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.
## Third-Party Licenses
This package uses the following open source libraries:
boto3: Licensed under the (Apache License 2.0)[https://github.com/boto/boto3/blob/develop/LICENSE]. Copyright Amazon.com, Inc. or its affiliates.



## Support

For issues and questions, please create an issue on the GitHub repository.

## Changelog

### v1.0.4
- Initial release
- Support for dual authentication strategy
- Comprehensive error handling