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Re_Backend/docs/GCP_STORAGE_SETUP.md

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GCP Cloud Storage Setup Guide for RE Workflow

Project Information

Item Value
Application RE Workflow System
Environment UAT
Domain https://reflow-uat.royalenfield.com
Purpose Store workflow documents and attachments

1. Requirements Overview

The RE Workflow application needs Google Cloud Storage to store:

  • Request documents (uploaded during workflow creation)
  • Attachments (added during approval process)
  • Supporting documents

Folder Structure in Bucket

reflow-documents-uat/
├── requests/
│   ├── REQ-2025-12-0001/
│   │   ├── documents/
│   │   │   ├── proposal.pdf
│   │   │   └── specification.docx
│   │   └── attachments/
│   │       ├── approval_note.pdf
│   │       └── signature.png
│   │
│   ├── REQ-2025-12-0002/
│   │   ├── documents/
│   │   │   └── budget_report.xlsx
│   │   └── attachments/
│   │       └── manager_approval.pdf
│   │
│   └── REQ-2025-12-0003/
│       ├── documents/
│       └── attachments/
│
└── temp/
    └── (temporary uploads before processing)

2. GCP Bucket Configuration

2.1 Create Bucket

Setting Value
Bucket Name reflow-documents-uat (UAT) / reflow-documents-prod (Production)
Location Type Region
Region asia-south1 (Mumbai)
Storage Class Standard
Access Control Uniform
Public Access Prevention Enforced (Block all public access)

2.2 Console Commands (gcloud CLI)

# Create bucket
gcloud storage buckets create gs://reflow-documents-uat \
  --project=YOUR_PROJECT_ID \
  --location=asia-south1 \
  --uniform-bucket-level-access

# Block public access
gcloud storage buckets update gs://reflow-documents-uat \
  --public-access-prevention

3. Service Account Setup

3.1 Create Service Account

Setting Value
Name reflow-storage-sa
Description Service account for RE Workflow file storage 
# Create service account
gcloud iam service-accounts create reflow-storage-sa \
  --display-name="RE Workflow Storage Service Account" \
  --project=YOUR_PROJECT_ID

3.2 Assign Permissions

The service account needs these roles:

Role Purpose
roles/storage.objectCreator Upload files
roles/storage.objectViewer Download/preview files
roles/storage.objectAdmin Delete files 
# Grant permissions
gcloud projects add-iam-policy-binding YOUR_PROJECT_ID \
  --member="serviceAccount:reflow-storage-sa@YOUR_PROJECT_ID.iam.gserviceaccount.com" \
  --role="roles/storage.objectAdmin"

3.3 Generate JSON Key

# Generate key file
gcloud iam service-accounts keys create gcp-key.json \
  --iam-account=reflow-storage-sa@YOUR_PROJECT_ID.iam.gserviceaccount.com

⚠️ Security: Share this key file securely (not via email). Use a secure file transfer method.

4. CORS Configuration

Apply this CORS policy to allow browser uploads:

4.1 Create cors-config.json

[
  {
    "origin": [
      "https://reflow-uat.royalenfield.com",
      "https://reflow.royalenfield.com"
    ],
    "method": ["GET", "PUT", "POST", "DELETE", "HEAD", "OPTIONS"],
    "responseHeader": [
      "Content-Type",
      "Content-Disposition",
      "Content-Length",
      "Cache-Control",
      "x-goog-meta-*"
    ],
    "maxAgeSeconds": 3600
  }
]

4.2 Apply CORS Policy

gcloud storage buckets update gs://reflow-documents-uat \
  --cors-file=cors-config.json

5. Lifecycle Rules (Optional but Recommended)

5.1 Auto-delete Temporary Files

Delete files in temp/ folder after 24 hours:

{
  "lifecycle": {
    "rule": [
      {
        "action": { "type": "Delete" },
        "condition": {
          "age": 1,
          "matchesPrefix": ["temp/"]
        }
      }
    ]
  }
}

gcloud storage buckets update gs://reflow-documents-uat \
  --lifecycle-file=lifecycle-config.json

6. Bucket Versioning (Recommended)

Enable versioning for accidental delete recovery:

gcloud storage buckets update gs://reflow-documents-uat \
  --versioning

7. Deliverables to Application Team

Please provide the following to the development team:

7.1 Environment Variables

Variable Value
GCP_PROJECT_ID your-gcp-project-id
GCP_BUCKET_NAME reflow-documents-uat
GCP_KEY_FILE ./config/gcp-key.json

7.2 Files to Share

File Description How to Share
gcp-key.json Service account key Secure transfer (not email)

8. Verification Steps

After setup, verify with:

# List bucket contents
gcloud storage ls gs://reflow-documents-uat/

# Test upload
echo "test" > test.txt
gcloud storage cp test.txt gs://reflow-documents-uat/temp/

# Test download
gcloud storage cp gs://reflow-documents-uat/temp/test.txt ./downloaded.txt

# Test delete
gcloud storage rm gs://reflow-documents-uat/temp/test.txt

9. Environment-Specific Buckets

Environment Bucket Name Region
Development reflow-documents-dev asia-south1
UAT reflow-documents-uat asia-south1
Production reflow-documents-prod asia-south1

10. Monitoring & Alerts (Optional)

10.1 Enable Logging

gcloud storage buckets update gs://reflow-documents-uat \
  --log-bucket=gs://your-logging-bucket \
  --log-object-prefix=reflow-storage-logs/

10.2 Storage Alerts

Set up alerts for:

  • Storage exceeds 80% of quota
  • Unusual download patterns
  • Failed access attempts

11. Cost Estimation

Item Estimate (Monthly)
Storage (100GB) ~$2.00
Operations (10K) ~$0.05
Network Egress Varies by usage

12. Security Checklist

  • Public access prevention enabled
  • Service account has minimal required permissions
  • JSON key stored securely (not in Git)
  • CORS configured for specific domains only
  • Bucket versioning enabled
  • Lifecycle rules for temp files
  • Access logging enabled

13. Contact

Role Contact
Application Team [Your Email]
DevOps Team [DevOps Email]

Appendix: Quick Reference

GCP Console URLs

gcloud Commands Summary

# Create bucket
gcloud storage buckets create gs://BUCKET_NAME --location=asia-south1

# Create service account
gcloud iam service-accounts create SA_NAME

# Generate key
gcloud iam service-accounts keys create key.json --iam-account=SA@PROJECT.iam.gserviceaccount.com

# Set CORS
gcloud storage buckets update gs://BUCKET_NAME --cors-file=cors.json

# Enable versioning
gcloud storage buckets update gs://BUCKET_NAME --versioning