WSGI Request Processing

def create_wsgi_request(
    event, 
    script_name=None, 
    base_path=None, 
    trailing_slash=True
):
    """
    Create WSGI environ dictionary from Lambda event.
    
    Converts API Gateway Lambda proxy integration event into
    standard WSGI environ dict for web application processing.
    
    Parameters:
    - event: dict, API Gateway Lambda proxy event
    - script_name: str, WSGI SCRIPT_NAME value
    - base_path: str, base path for the application
    - trailing_slash: bool, add trailing slash to paths
    
    Returns:
    dict: WSGI environ dictionary
    """

def process_lambda_payload_v1(event):
    """
    Process API Gateway v1.0 payload format.
    
    Extracts HTTP request data from API Gateway v1.0 Lambda
    proxy integration event format.
    
    Parameters:
    - event: dict, API Gateway v1.0 event
    
    Returns:
    tuple: (method, path, headers, body, query_params)
    """

def process_lambda_payload_v2(event):
    """
    Process API Gateway v2.0 payload format.
    
    Extracts HTTP request data from API Gateway v2.0 Lambda
    proxy integration event format.
    
    Parameters:
    - event: dict, API Gateway v2.0 event
    
    Returns:
    tuple: (method, path, headers, body, query_params)
    """

def common_log(environ, response, response_time=None):
    """
    Create Apache Common Log Format entries.
    
    Generates standardized log entries from WSGI environ
    and response data for request monitoring.
    
    Parameters:
    - environ: dict, WSGI environ dictionary
    - response: dict, HTTP response data
    - response_time: float, request processing time in seconds
    
    Returns:
    str: Common Log Format entry
    """

def get_wsgi_string(wsgi_string):
    """
    Encode string for WSGI compatibility.
    
    Ensures proper string encoding for WSGI environ values
    and HTTP headers.
    
    Parameters:
    - wsgi_string: str, input string to encode
    
    Returns:
    str: WSGI-compatible encoded string
    """

class ZappaWSGIMiddleware:
    """
    WSGI middleware for Zappa-specific request handling.
    
    Provides WSGI application interface with Zappa-specific
    processing for Lambda/API Gateway integration including
    header manipulation for AWS compatibility.
    """
    
    def __init__(self, application):
        """
        Initialize middleware with WSGI application.
        
        Parameters:
        - application: callable, WSGI application
        """
    
    def __call__(self, environ, start_response):
        """
        WSGI application interface.
        
        Processes WSGI requests with Zappa-specific handling
        and delegates to wrapped application.
        
        Parameters:
        - environ: dict, WSGI environ dictionary
        - start_response: callable, WSGI start_response function
        
        Returns:
        iterable: WSGI response
        """

def all_casings(input_text):
    """
    Generate all case permutations of a string.
    
    Used for case-insensitive header matching in AWS 
    Lambda/API Gateway environments.
    
    Parameters:
    - input_text: str, text to generate casings for
    
    Returns:
    list: All possible case permutations
    """

# HTTP methods that may contain binary data
BINARY_METHODS = ['POST', 'PUT', 'PATCH']

from zappa.wsgi import create_wsgi_request

def lambda_handler(event, context):
    # Convert Lambda event to WSGI environ
    environ = create_wsgi_request(event)
    
    # Use with existing WSGI application
    response = my_wsgi_app(environ, start_response)
    return response

from zappa.wsgi import create_wsgi_request, ZappaWSGIMiddleware
from django.core.wsgi import get_wsgi_application

# Wrap Django WSGI app with Zappa middleware
django_app = get_wsgi_application()
zappa_app = ZappaWSGIMiddleware(django_app)

def lambda_handler(event, context):
    environ = create_wsgi_request(event)
    return zappa_app(environ, start_response)

from zappa.wsgi import create_wsgi_request, ZappaWSGIMiddleware
from flask import Flask

app = Flask(__name__)
zappa_app = ZappaWSGIMiddleware(app)

@app.route('/')
def hello():
    return 'Hello from Lambda!'

def lambda_handler(event, context):
    environ = create_wsgi_request(event)
    return zappa_app(environ, start_response)

from zappa.wsgi import common_log, process_lambda_payload_v1
import time

def lambda_handler(event, context):
    start_time = time.time()
    
    # Process API Gateway payload
    method, path, headers, body, query_params = process_lambda_payload_v1(event)
    
    # Create WSGI environ
    environ = create_wsgi_request(event)
    
    # Process request
    response = my_app(environ, start_response)
    
    # Log request
    response_time = time.time() - start_time
    log_entry = common_log(environ, response, response_time)
    print(log_entry)
    
    return response

from zappa.wsgi import BINARY_METHODS, get_wsgi_string
import base64

def lambda_handler(event, context):
    environ = create_wsgi_request(event)
    
    # Handle binary content for specific methods
    if environ['REQUEST_METHOD'] in BINARY_METHODS:
        if event.get('isBase64Encoded', False):
            body = base64.b64decode(event['body'])
            environ['wsgi.input'] = io.BytesIO(body)
    
    return my_app(environ, start_response)