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import logging
from aiohttp import web
import os
logger = logging.getLogger(__package__)
def setup_middlewares(app):
error_middleware = error_pages({404: handle_404,
500: handle_500})
app.middlewares.append(error_middleware)
app.middlewares.append(cache_control_middleware)
# Cache-Control middleware
CACHE_MAX_AGE = int(os.getenv("CACHE_MAX_AGE", "30"))
NO_CACHE_ENDPOINTS = ['/v1/', '/v1/__version__', '/v1/__heartbeat__', '/v1/__lbheartbeat__']
async def cache_control_middleware(app, handler):
async def middleware_handler(request):
response = await handler(request)
cache_control_value = "public; max-age={}".format(CACHE_MAX_AGE)
if request.path in NO_CACHE_ENDPOINTS or CACHE_MAX_AGE <= 0:
cache_control_value = "no-cache"
response.headers.setdefault("Cache-Control", cache_control_value)
return response
return middleware_handler
# Error page middlewares
def error_pages(overrides):
async def middleware(app, handler):
async def middleware_handler(request):
try:
response = await handler(request)
override = overrides.get(response.status)
if override is None:
return response
else:
return await override(request, response)
except web.HTTPException as ex:
override = overrides.get(ex.status)
if override is None:
return await handle_any(request, ex)
else:
return await override(request, ex)
except Exception as ex:
return await handle_500(request, error=ex)
return middleware_handler
return middleware
async def handle_any(request, response):
return web.json_response({
"status": response.status,
"message": response.reason
}, status=response.status)
async def handle_404(request, response):
if 'json' not in response.headers['Content-Type']:
if request.path.endswith('/'):
# BUG: CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
# return web.HTTPFound(request.path.rstrip('/'))
# FIXED:
return web.HTTPFound('/' + request.path.strip('/'))
return web.json_response({
"status": 404,
"message": "Page '{}' not found".format(request.path)
}, status=404)
return response
async def handle_500(request, response=None, error=None):
logger.exception(error)
return web.json_response({
"status": 503,
"message": "Service currently unavailable"
}, status=503)
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