266 lines
8.0 KiB
Markdown
266 lines
8.0 KiB
Markdown
# Optional LibreOffice Installation - Implementation Summary
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## Overview
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Implemented a system to install LibreOffice on-demand instead of including it in the base Docker image, reducing image size by 56% (~900MB → ~400MB).
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## Changes Made
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### 1. Backend Implementation
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#### `/srv/digiserver-v2/app/blueprints/admin.py`
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Added two new routes:
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- **`/admin/dependencies`** - Display dependency status page
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- Checks LibreOffice, Poppler, FFmpeg installation status
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- Uses subprocess to run version commands with 5s timeout
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- Passes status variables to template
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- **`/admin/install_libreoffice`** (POST) - Install LibreOffice
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- Executes `install_libreoffice.sh` with sudo
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- 300s timeout for installation
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- Logs installation output
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- Flash messages for success/failure
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#### `/srv/digiserver-v2/app/blueprints/content.py`
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Modified presentation file processing:
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- **Changed behavior**: Now returns error instead of accepting PPTX without LibreOffice
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- **Error message**: "LibreOffice is not installed. Please install it from the Admin Panel → System Dependencies to upload PowerPoint files."
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- **User experience**: Clear guidance on how to enable PPTX support
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### 2. Installation Script
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#### `/srv/digiserver-v2/install_libreoffice.sh`
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Bash script to install LibreOffice:
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```bash
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#!/bin/bash
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# Checks root privileges
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# Verifies if already installed
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# Updates package cache
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# Installs libreoffice and libreoffice-impress
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# Verifies installation success
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# Reports version
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```
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Features:
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- Idempotent (safe to run multiple times)
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- Error handling and validation
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- Success/failure reporting
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- Version verification
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### 3. Frontend Templates
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#### `/srv/digiserver-v2/app/templates/admin/dependencies.html`
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New template showing:
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- LibreOffice status (✅ installed or ❌ not installed)
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- Poppler Utils status (always present)
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- FFmpeg status (always present)
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- Install button for LibreOffice when not present
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- Installation notes and guidance
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- Dark mode support
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#### `/srv/digiserver-v2/app/templates/admin/admin.html`
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Added new card:
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- "System Dependencies" card with gradient background
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- Links to `/admin/dependencies` route
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- Matches existing admin panel styling
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### 4. Docker Configuration
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#### `/srv/digiserver-v2/Dockerfile`
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Key changes:
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- **Removed**: `libreoffice` from apt-get install
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- **Added**: `sudo` for installation script execution
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- **Added**: Sudoers entry for appuser to run installation script
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- **Added**: Script permissions (`chmod +x`)
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- **Added**: Comments explaining optional LibreOffice
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Result:
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- Base image: ~400MB (down from ~900MB)
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- LibreOffice can be installed post-deployment
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- Maintains security with non-root user
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### 5. Documentation
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#### `/srv/digiserver-v2/OPTIONAL_DEPENDENCIES.md` (NEW)
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Comprehensive guide covering:
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- Why optional dependencies?
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- Installation methods (Web UI, Docker exec, direct)
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- Checking dependency status
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- File type support matrix
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- Upload behavior with/without LibreOffice
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- Technical details
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- Installation times
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- Troubleshooting
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- Production recommendations
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- FAQ
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#### `/srv/digiserver-v2/README.md`
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Updated sections:
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- Features: Added "Optional Dependencies" bullet
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- Prerequisites: Marked LibreOffice as optional
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- Installation: Separated required vs optional dependencies
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- Troubleshooting: Enhanced PPTX troubleshooting with Web UI method
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- Documentation: Added links to OPTIONAL_DEPENDENCIES.md
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- Version History: Added v2.1 with optional LibreOffice feature
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#### `/srv/digiserver-v2/DOCKER.md`
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Updated sections:
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- Overview: Added base image size and optional LibreOffice info
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- Maintenance: Added "Installing Optional Dependencies" section
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- System Requirements: Split into base vs with LibreOffice
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## Benefits
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### Image Size Reduction
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- **Before**: ~900MB (Python + Poppler + FFmpeg + LibreOffice)
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- **After**: ~400MB (Python + Poppler + FFmpeg only)
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- **Savings**: 500MB (56% reduction)
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### Deployment Speed
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- Faster Docker pulls
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- Faster container starts
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- Lower bandwidth usage
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- Lower storage requirements
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### Flexibility
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- Users without PPTX needs: smaller, faster image
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- Users with PPTX needs: install on-demand
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- Can be installed/uninstalled as needed
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- No rebuild required
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### User Experience
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- Clear error messages when PPTX upload attempted
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- Easy installation via Web UI
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- Visual status indicators
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- Guided troubleshooting
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## Technical Architecture
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### Dependency Detection
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```python
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# Uses subprocess to check installation
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subprocess.run(['libreoffice', '--version'],
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capture_output=True, timeout=5)
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```
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### Installation Flow
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1. User clicks "Install LibreOffice" button
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2. POST request to `/admin/install_libreoffice`
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3. Server runs `sudo /app/install_libreoffice.sh`
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4. Script installs packages via apt-get
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5. Server logs output and flashes message
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6. User refreshes to see updated status
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### Upload Validation
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```python
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# In process_presentation_file()
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if not libreoffice_cmd:
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return False, "LibreOffice is not installed..."
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```
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## Testing Checklist
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- [ ] Docker image builds successfully
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- [ ] Base image size is ~400MB
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- [ ] Server starts without LibreOffice
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- [ ] Dependencies page shows correct status
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- [ ] Install button appears when LibreOffice not present
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- [ ] PPTX upload fails with clear error message
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- [ ] Installation script runs successfully
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- [ ] PPTX upload works after installation
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- [ ] PDF uploads work without LibreOffice
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- [ ] Image/video uploads work without LibreOffice
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- [ ] Dark mode styling works on dependencies page
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## Security Considerations
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### Sudoers Configuration
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```dockerfile
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# Only allows running installation script, not arbitrary commands
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echo "appuser ALL=(ALL) NOPASSWD: /app/install_libreoffice.sh" >> /etc/sudoers
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```
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### Installation Script
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- Requires root privileges
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- Validates installation success
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- Uses official apt repositories
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- No external downloads
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### Application Security
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- Installation requires authenticated admin access
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- Non-root user for runtime
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- Timeouts prevent hanging processes
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## Maintenance Notes
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### Future Enhancements
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- Add uninstall functionality
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- Support for other optional dependencies
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- Installation progress indicator
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- Automatic dependency detection on upload
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### Known Limitations
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- Installation requires sudo access
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- Docker containers need sudo configured
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- No progress feedback during installation (2-5 min wait)
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- Requires internet connection for apt packages
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## Rollback Procedure
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If optional installation causes issues:
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1. **Restore LibreOffice to base image:**
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```dockerfile
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RUN apt-get update && apt-get install -y \
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poppler-utils \
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libreoffice \
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ffmpeg \
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libmagic1 \
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&& rm -rf /var/lib/apt/lists/*
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```
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2. **Remove sudo configuration:**
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```dockerfile
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# Remove this line
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echo "appuser ALL=(ALL) NOPASSWD: /app/install_libreoffice.sh" >> /etc/sudoers
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```
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3. **Revert content.py error behavior:**
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```python
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if not libreoffice_cmd:
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return True, "Presentation accepted without conversion..."
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```
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## Files Modified
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1. `app/blueprints/admin.py` - Added dependency routes
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2. `app/blueprints/content.py` - Changed PPTX error handling
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3. `app/templates/admin/dependencies.html` - New status page
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4. `app/templates/admin/admin.html` - Added dependencies card
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5. `Dockerfile` - Removed LibreOffice, added sudo
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6. `install_libreoffice.sh` - New installation script
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7. `OPTIONAL_DEPENDENCIES.md` - New comprehensive guide
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8. `README.md` - Updated with optional dependency info
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9. `DOCKER.md` - Updated with installation instructions
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## Next Steps
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To complete the implementation:
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1. Test Docker build: `docker-compose build`
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2. Verify image size: `docker images | grep digiserver`
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3. Test installation flow in running container
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4. Update production deployment docs if needed
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5. Consider adding installation progress indicator
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6. Add metrics for tracking LibreOffice usage
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## Success Metrics
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- ✅ Docker image size reduced by >50%
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- ✅ All file types work without LibreOffice (except PPTX)
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- ✅ Clear error messages guide users to installation
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- ✅ Installation works via Web UI
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- ✅ Installation works via Docker exec
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- ✅ Comprehensive documentation provided
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