# Blockscout MetaMask Fix - Quick Reference

## ✅ Status: FIXED & DEPLOYED

**Date**: $(date)  
**VMID**: 5000  
**Frontend Location**: `/var/www/html/index.html`  
**Status**: ✅ Live

---

## 🚀 Quick Commands

### Deploy Fixed Frontend
```bash
cd /home/intlc/projects/proxmox
./scripts/deploy-blockscout-frontend.sh
```

### Verify Deployment
```bash
ssh root@192.168.11.140 "grep -q 'unpkg.com' /var/www/html/index.html && echo '✅ Fallback CDN present' || echo '❌ Not found'"
```

### Check Nginx Status
```bash
ssh root@192.168.11.140 "systemctl status nginx"
```

### View Logs
```bash
ssh root@192.168.11.140 "tail -f /var/log/nginx/blockscout-access.log"
```

---

## 🔧 What Was Fixed

1. **Ethers Library Loading**
   - Primary CDN: `https://cdn.ethers.io/lib/ethers-5.7.2.umd.min.js`
   - Fallback CDN: `https://unpkg.com/ethers@5.7.2/dist/ethers.umd.min.js`
   - Automatic fallback detection

2. **Error Handling**
   - Added `ensureEthers()` helper function
   - Checks before all ethers usage
   - Clear error messages

3. **Functions Protected**
   - `connectMetaMask()`
   - `refreshWETHBalances()`
   - `wrapWETH9()` / `unwrapWETH9()`
   - `wrapWETH10()` / `unwrapWETH10()`

---

## 🧪 Testing

### Test in Browser
1. Open: https://explorer.d-bis.org
2. Open Developer Console (F12)
3. Check for "Ethers loaded successfully" message
4. Click "Connect MetaMask"
5. Should connect without "ethers is not defined" error

### Test Fallback CDN
1. Block primary CDN in browser (Network tab → Block request URL)
2. Refresh page
3. Should automatically load from unpkg.com
4. MetaMask should still work

---

## 📋 Next Steps (Recommended)

### High Priority
1. **Add Local Fallback**
   ```bash
   ssh root@192.168.11.140
   cd /var/www/html
   mkdir -p js
   wget https://unpkg.com/ethers@5.7.2/dist/ethers.umd.min.js -O js/ethers.umd.min.js
   # Then update index.html to use /js/ethers.umd.min.js as final fallback
   ```

2. **Add Connection State Persistence**
   - Save connection state to localStorage
   - Restore on page load

3. **Improve Error Messages**
   - User-friendly error messages
   - Toast notifications

### Medium Priority
4. Add network detection
5. Add SRI (Subresource Integrity) checks
6. Add CSP (Content Security Policy) headers
7. Add connection retry logic

### Low Priority
8. Add service worker for offline support
9. Add comprehensive testing
10. Add analytics/monitoring

---

## 🐛 Troubleshooting

### Issue: Still getting "ethers is not defined"
**Solution**:
1. Clear browser cache (Ctrl+Shift+R)
2. Check browser console for errors
3. Verify both CDNs are accessible
4. Check if browser extensions are blocking

### Issue: Frontend not updating
**Solution**:
1. Verify file was deployed: `ssh root@192.168.11.140 "head -20 /var/www/html/index.html | grep unpkg"`
2. Clear nginx cache: `ssh root@192.168.11.140 "systemctl reload nginx"`
3. Clear browser cache

### Issue: Deployment fails
**Solution**:
1. Check SSH access: `ssh root@192.168.11.140 "echo 'OK'"`
2. Check file exists: `ls -la explorer-monorepo/frontend/public/index.html`
3. Check permissions: `chmod +x scripts/deploy-blockscout-frontend.sh`

---

## 📚 Documentation

- **Complete Recommendations**: `docs/BLOCKSCOUT_METAMASK_COMPLETE_RECOMMENDATIONS.md`
- **Fix Details**: `docs/BLOCKSCOUT_METAMASK_ETHERS_FIX.md`
- **Deployment Script**: `scripts/deploy-blockscout-frontend.sh`

---

## ✅ Verification Checklist

- [x] Ethers library loads from primary CDN
- [x] Fallback CDN works
- [x] MetaMask connection works
- [x] Error messages are clear
- [ ] Local fallback available (recommended)
- [ ] Connection state persists (recommended)
- [ ] Network switching works (recommended)

---

**Last Updated**: $(date)  
**Status**: ✅ Production Ready

