quantum-ai-v2/agents/views.py

from rest_framework import status
from rest_framework.decorators import api_view, permission_classes
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from rest_framework.pagination import PageNumberPagination
from django.shortcuts import get_object_or_404, render
from django.utils import timezone
from django.contrib.auth.decorators import login_required
from django.db import models
from .models import Agent, AgentExecution, AgentCategory
from .serializers import AgentSerializer, AgentExecutionSerializer
import requests
import json
import time
import uuid
import ipaddress
from urllib.parse import urlparse

def validate_webhook_url(url):
    """
    Validate webhook URL to prevent SSRF attacks.
    Only allows HTTPS URLs to external, non-private networks.
    """
    try:
        parsed = urlparse(url)
        
        # Only allow HTTP/HTTPS protocols
        if parsed.scheme not in ['http', 'https']:
            raise ValueError("Only HTTP/HTTPS URLs are allowed")
        
        # Get hostname
        hostname = parsed.hostname
        if not hostname:
            raise ValueError("Invalid hostname in URL")
        
        # For localhost development, allow localhost URLs first
        if hostname in ['localhost', '127.0.0.1'] and parsed.port in [5678, 8000, 8080]:
            return True  # Allow N8N development server
        
        # Check if hostname is an IP address
        try:
            ip = ipaddress.ip_address(hostname)
            # Block private, loopback, and reserved IP ranges
            if (ip.is_private or ip.is_loopback or ip.is_reserved or 
                ip.is_link_local or ip.is_multicast):
                raise ValueError("Internal/private IP addresses are not allowed")
        except ValueError as e:
            if "does not appear to be an IPv4 or IPv6 address" not in str(e):
                raise  # Re-raise if it's not just a "not an IP" error
            # If it's not an IP, it's a domain name - that's fine
            
        return True
        
    except Exception as e:
        raise ValueError(f"Invalid webhook URL: {str(e)}")

@api_view(['GET'])
@permission_classes([IsAuthenticated])
def agent_list(request):
    """List all active agents with optional category filtering"""
    agents = Agent.objects.filter(is_active=True)
    
    category = request.GET.get('category')
    if category:
        agents = agents.filter(category__slug=category)
    
    search = request.GET.get('search')
    if search:
        agents = agents.filter(name__icontains=search)
    
    paginator = PageNumberPagination()
    paginator.page_size = 20
    result_page = paginator.paginate_queryset(agents, request)
    serializer = AgentSerializer(result_page, many=True)
    return paginator.get_paginated_response(serializer.data)

@api_view(['GET'])
@permission_classes([IsAuthenticated])
def agent_detail(request, slug):
    """Get detailed agent information"""
    agent = get_object_or_404(Agent, slug=slug, is_active=True)
    serializer = AgentSerializer(agent)
    return Response(serializer.data)

@api_view(['POST'])
@permission_classes([IsAuthenticated])
def execute_agent(request):
    """Execute an agent with provided input data"""
    agent_slug = request.data.get('agent_slug')
    input_data = request.data.get('input_data', {})
    
    if not agent_slug:
        return Response({'error': 'agent_slug is required'}, status=status.HTTP_400_BAD_REQUEST)
    
    agent = get_object_or_404(Agent, slug=agent_slug, is_active=True)
    
    # Check if user has sufficient balance (using existing wallet system)
    if hasattr(request.user, 'has_sufficient_balance') and not request.user.has_sufficient_balance(agent.price):
        return Response({'error': 'Insufficient wallet balance'}, status=status.HTTP_400_BAD_REQUEST)
    
    # Create execution record
    execution = AgentExecution.objects.create(
        agent=agent,
        user=request.user,
        input_data=input_data,
        fee_charged=agent.price,
        status='pending'
    )
    
    try:
        # Deduct fee from user wallet (using existing wallet system)
        if hasattr(request.user, 'deduct_balance'):
            success = request.user.deduct_balance(
                agent.price, 
                f'{agent.name} - Execution {str(execution.id)[:8]}',
                agent.slug
            )
            if not success:
                execution.status = 'failed'
                execution.error_message = 'Failed to deduct wallet balance'
                execution.save()
                return Response({'error': 'Failed to deduct wallet balance'}, status=status.HTTP_400_BAD_REQUEST)
        
        # Validate webhook URL to prevent SSRF attacks
        try:
            validate_webhook_url(agent.webhook_url)
        except ValueError as e:
            execution.status = 'failed'
            execution.error_message = f'Invalid webhook URL: {str(e)}'
            execution.save()
            return Response({'error': f'Invalid webhook URL: {str(e)}'}, status=status.HTTP_400_BAD_REQUEST)
        
        # Call n8n webhook with proper payload format
        execution.status = 'running'
        execution.save()
        
        # Generate session ID
        session_id = f"session_{int(time.time() * 1000)}_{str(uuid.uuid4())[:8]}"
        
        # Format message text for N8N based on agent type
        message_text = format_agent_message(agent.slug, input_data)
        
        webhook_payload = {
            'sessionId': session_id,
            'message': {'text': message_text},
            'webhookUrl': agent.webhook_url,
            'executionMode': 'production',
            'agentId': str(agent.id),
            'executionId': str(execution.id),
            'userId': str(request.user.id)
        }
        
        response = requests.post(
            agent.webhook_url,
            json=webhook_payload,
            timeout=90,  # Increased timeout for complex processing
            headers={'Content-Type': 'application/json'}
        )
        
        # Store webhook response
        execution.webhook_response = response.json() if response.headers.get('content-type', '').startswith('application/json') else {'raw': response.text}
        
        if response.status_code == 200:
            execution.status = 'completed'
            execution.output_data = execution.webhook_response
        else:
            execution.status = 'failed'
            execution.error_message = f"Webhook returned {response.status_code}: {response.text[:500]}"
        
        execution.completed_at = timezone.now()
        execution.save()
        
        serializer = AgentExecutionSerializer(execution)
        return Response(serializer.data, status=status.HTTP_201_CREATED)
        
    except requests.RequestException as e:
        execution.status = 'failed'
        execution.error_message = str(e)
        execution.completed_at = timezone.now()
        execution.save()
        
        return Response({
            'error': 'Failed to execute agent',
            'execution_id': str(execution.id)
        }, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

@api_view(['GET'])
@permission_classes([IsAuthenticated])
def execution_list(request):
    """List user's agent executions"""
    executions = AgentExecution.objects.filter(user=request.user)
    
    paginator = PageNumberPagination()
    paginator.page_size = 20
    result_page = paginator.paginate_queryset(executions, request)
    serializer = AgentExecutionSerializer(result_page, many=True)
    return paginator.get_paginated_response(serializer.data)

@api_view(['GET'])
@permission_classes([IsAuthenticated])
def execution_detail(request, execution_id):
    """Get detailed execution information"""
    execution = get_object_or_404(AgentExecution, id=execution_id, user=request.user)
    serializer = AgentExecutionSerializer(execution)
    return Response(serializer.data)


def format_agent_message(agent_slug, input_data):
    """Format input data into a message for N8N webhook based on agent type"""
    if agent_slug == 'social-ads-generator':
        description = input_data.get('description', '')
        platform = input_data.get('social_platform', '')
        emoji = input_data.get('include_emoji', 'yes')
        language = input_data.get('language', 'English')
        
        return f"Execute Social Media Ad Creator with the following parameters:. Describe what you'd like to generate: {description}. Include Emoji: {emoji.title()}. For Social Media Platform: {platform.title()}. Language: {language}."
    
    elif agent_slug == 'job-posting-generator':
        job_title = input_data.get('job_title', '')
        company_name = input_data.get('company_name', '')
        description = input_data.get('job_description', '')
        seniority = input_data.get('seniority_level', '')
        contract = input_data.get('contract_type', '')
        location = input_data.get('location', '')
        language = input_data.get('language', 'English')
        
        return f"Create a professional job posting for: {job_title} at {company_name}. Description: {description}. Seniority: {seniority}. Contract: {contract}. Location: {location}. Language: {language}. Make it comprehensive and attractive to candidates."
    
    # Default formatting for other agents
    params = [f"{key}: {value}" for key, value in input_data.items() if value]
    return f"Execute {agent_slug.replace('-', ' ').title()} with parameters: {'. '.join(params)}."


# Web interface views
@login_required
def agent_detail_view(request, slug):
    """Render agent detail page with dynamic form"""
    agent = get_object_or_404(Agent, slug=slug, is_active=True)
    
    context = {
        'agent': agent,
        'timestamp': int(time.time())  # For cache busting
    }
    
    return render(request, 'agents/agent_detail.html', context)


def agents_marketplace(request):
    """Agent marketplace view"""
    agents = Agent.objects.filter(is_active=True).select_related('category')
    categories = AgentCategory.objects.filter(is_active=True)
    
    # Filter by category
    category_slug = request.GET.get('category')
    if category_slug:
        agents = agents.filter(category__slug=category_slug)
    
    # Search functionality
    search_query = request.GET.get('search', '').strip()
    if search_query:
        agents = agents.filter(
            models.Q(name__icontains=search_query) |
            models.Q(short_description__icontains=search_query) |
            models.Q(description__icontains=search_query)
        )
    
    context = {
        'agents': agents,
        'categories': categories,
        'selected_category': category_slug,
        'search_query': search_query,
        'timestamp': int(time.time())
    }
    
    return render(request, 'agents/marketplace.html', context)