Build Production S3 File Sharing with IAM & SNS Notifications | AWS Complete Project

🏗️ Build production-ready S3 file-sharing with IAM permissions, SNS notifications, and event-driven architecture!

Learn to architect secure external file access, implement real-time notifications, and test security boundaries. This is real-world AWS architecture for file sharing systems.

🎯 WHAT YOU'LL BUILD
✅ S3 bucket for secure external file sharing
✅ IAM group with precisely scoped permissions
✅ IAM user (mediacouser) for external partner access
✅ SNS topic for real-time email notifications
✅ S3 event notifications for ObjectCreated/ObjectRemoved
✅ Complete security testing workflow

🔧 KEY TECHNOLOGIES
*Amazon S3:* Event notifications, ACLs, public access configuration
*AWS IAM:* Groups, users, custom policies with 3 statements
*Amazon SNS:* Topics, subscriptions, email notifications
*AWS CLI:* s3 and s3api commands, JSON configurations

💡 REAL-WORLD USE CASES
📸 Marketing teams sharing product photos with agencies
📄 Legal firms sharing case files with clients
🎬 Video production companies uploading raw footage
📊 Partners uploading datasets for analysis

🔐 IAM POLICY ARCHITECTURE
*Three-Statement Design:*
1. *Console Navigation* - ListAllMyBuckets for UI
2. *Bucket Listing* - List objects with prefix conditions
3. *Object Operations* - Get/Put/Delete restricted to images/* only

*Missing Permissions (By Design):*
❌ PutObjectAcl - Cannot change permissions
❌ PutBucketPolicy - Cannot modify bucket policy
❌ DeleteBucket - Cannot delete bucket

*Result:* External users can upload/delete files but CANNOT change permissions or access other folders.

📊 EVENT-DRIVEN FLOW
User uploads → S3 detects ObjectCreated → Publishes to SNS → Admin receives email

*Events Monitored:*
ObjectCreated:* (Put, Post, Copy)
ObjectRemoved:* (Delete)

🎓 WHO IS THIS FOR?
✅ Solutions Architects designing file-sharing systems
✅ DevOps Engineers implementing workflows
✅ Security Engineers enforcing access controls
✅ Cloud Engineers preparing for certifications

📚 RESOURCES
🔗 S3 Event Notifications: https://docs.aws.amazon.com/AmazonS3/...
🔗 IAM Policy Examples: https://docs.aws.amazon.com/AmazonS3/...
🔗 SNS Getting Started: https://docs.aws.amazon.com/sns/lates...

💡 BEST PRACTICES
1. Use IAM groups for role-based access
2. Apply principle of least privilege
3. Restrict by resource prefix (images/*)
4. Filter events by prefix to reduce noise
5. Test unauthorized operations
6. Enable CloudTrail for audit logs
7. Rotate access keys regularly
8. Use SNS for real-time awareness

🚀 ADVANCED PATTERNS
*JSON Event Configuration:*
```json
{
"TopicConfigurations": [{
"Events": ["s3:ObjectCreated:*","s3:ObjectRemoved:*"],
"Filter": {"Key": {"FilterRules": [{"Name": "prefix", "Value": "images/"}]}}
}]
}
```

*SNS Access Policy:*
Allows S3 service to publish, restricted by source ARN condition

🔔 NEXT STEPS
Add Lambda for automatic image processing
Implement lifecycle policies for archival
Set up cross-region replication
Integrate with Step Functions

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💬 *COMMENT:* Share your file-sharing challenges!

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