Custom Error Pages & Improved Error Handling

[yadavchiragg]

Summary

Added professional custom error pages (404, 403, 500) with user-friendly messages and improved error handling.

What's Added

New Error Pages

• 404 Not Found - Beautiful page when URL doesn't exist
• 403 Forbidden - Access denied page for unauthorized access
• 500 Server Error - Internal server error page
• Base Error Template - Reusable template for all errors

Features

Responsive design (mobile-friendly)
Animated icons with bounce effect
Clear error messages with helpful suggestions
Action buttons (Go Home, Go Back, Try Again)
Context-aware navigation (Login/Profile based on auth status)
Professional gradient background
Works independently of main site design

Improved Error Handling

Custom 413 handler for file size limit
Database rollback on 500 errors
User-friendly flash messages
Proper error logging

Benefits

• Better user experience when errors occur
• Professional appearance
• Reduced user confusion
• Clear guidance on what to do next
• Helps with debugging

Technical Details

• Standalone HTML (works even if main site breaks)
• No dependencies on base.html
• Pure CSS animations
• Mobile-responsive
• Accessible design

Screenshots

Testing

Tested on:

• Chrome, Firefox, Edge
• Desktop and mobile views
• Various error scenarios
• Auth and non-auth states

Addresses Mentor Feedback

Improves existing features with better error handling and user experience - quality over quantity approach.

[gemini-code-assist]

Summary of Changes

Hello @yadavchiragg, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly upgrades the application's user experience and operational capabilities. It introduces a suite of custom, aesthetically pleasing error pages that guide users effectively during unexpected situations. Concurrently, it integrates robust Docker support, simplifying deployment and development workflows with detailed documentation. The addition of an administrative dashboard provides powerful tools for managing application data and users, while a new testing framework ensures the reliability and security of these enhancements.

Highlights

• Custom Error Pages: Introduced professional and user-friendly custom error pages for 404 (Not Found), 403 (Forbidden), and 500 (Internal Server Error). These pages feature responsive design, animated icons, clear messages, helpful suggestions, and context-aware action buttons (e.g., Go Home, Login/Profile based on authentication status).
• Improved Error Handling: Enhanced application error handling with a custom handler for 413 (Payload Too Large) errors, database rollback on 500 errors to prevent data corruption, and user-friendly flash messages for various error scenarios. Proper error logging is also integrated.
• Docker Integration: Added comprehensive Docker support, including a Dockerfile for containerization, a docker-compose.yml for easy multi-service deployment, and a detailed DOCKER.md guide covering quick start, development, troubleshooting, production deployment, performance, monitoring, backup, and security best practices.
• Admin Dashboard: Implemented a new admin dashboard with routes and functionalities for managing users and images. This includes an admin_required decorator to secure admin-only access, user and image listings with search capabilities, user detail views, and actions like deleting users/images and toggling admin status.
• Application Structure and Testing: Refactored application configuration into a dedicated config.py file for better management of development and production settings. A comprehensive test suite using pytest has been added, covering authentication, uploads, admin features, and security aspects, ensuring application stability and reliability.

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Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/tests.yml

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[gemini-code-assist]

Code Review

This pull request introduces a significant number of features, including custom error pages, a full admin dashboard, and Docker support. The addition of comprehensive tests and deployment configurations for Render is excellent. However, there are several critical and high-severity issues that need to be addressed. The most critical is a security vulnerability where the debug mode is enabled in the Docker container. There are also significant issues with code duplication, inconsistency in configuration and application structure, and hardcoded secrets. Additionally, the frontend templates rely heavily on inline CSS, which will be a maintenance nightmare. I've provided specific comments with suggestions to resolve these issues.