187 lines
6.5 KiB
Python
187 lines
6.5 KiB
Python
import re
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import mimetypes
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from pathlib import Path
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from typing import Dict, Any, Optional, Pattern
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from starlette.requests import Request
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from starlette.responses import Response, FileResponse, PlainTextResponse
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from .logging_utils import get_logger
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logger = get_logger(__name__)
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class RouteMatch:
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def __init__(self, config: Dict[str, Any], params: Optional[Dict[str, str]] = None):
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self.config = config
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self.params = params or {}
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class Router:
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def __init__(self, static_dir: str = "./static"):
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self.static_dir = Path(static_dir)
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self.routes: Dict[Pattern, Dict[str, Any]] = {}
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self.exact_routes: Dict[str, Dict[str, Any]] = {}
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self.default_route: Optional[Dict[str, Any]] = None
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def add_route(self, pattern: str, config: Dict[str, Any]) -> None:
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if pattern.startswith("="):
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exact_path = pattern[1:]
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self.exact_routes[exact_path] = config
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logger.debug(f"Added exact route: {exact_path}")
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return
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if pattern == "__default__":
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self.default_route = config
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logger.debug("Added default route")
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return
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if pattern.startswith("~"):
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case_insensitive = pattern.startswith("~*")
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regex_pattern = pattern[2:] if case_insensitive else pattern[1:]
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flags = re.IGNORECASE if case_insensitive else 0
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try:
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compiled_pattern = re.compile(regex_pattern, flags)
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self.routes[compiled_pattern] = config
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logger.debug(f"Added regex route: {pattern}")
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except re.error as e:
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logger.error(f"Regex compilation error {pattern}: {e}")
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def match(self, path: str) -> Optional[RouteMatch]:
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if path in self.exact_routes:
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return RouteMatch(self.exact_routes[path])
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for pattern, config in self.routes.items():
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match = pattern.search(path)
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if match:
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params = match.groupdict()
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return RouteMatch(config, params)
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if self.default_route:
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return RouteMatch(self.default_route)
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return None
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class RequestHandler:
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def __init__(self, router: Router, static_dir: str = "./static"):
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self.router = router
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self.static_dir = Path(static_dir)
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async def handle(self, request: Request) -> Response:
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path = request.url.path
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logger.info(f"{request.method} {path}")
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route_match = self.router.match(path)
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if not route_match:
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return PlainTextResponse("404 Not Found", status_code=404)
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try:
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return await self._process_route(request, route_match)
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except Exception as e:
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logger.error(f"Request processing error {path}: {e}")
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return PlainTextResponse("500 Internal Server Error", status_code=500)
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async def _process_route(self, request: Request, route_match: RouteMatch) -> Response:
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config = route_match.config
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# HINT: Not using it right now
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# path = request.url.path
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if "return" in config:
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status_text = config["return"]
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if " " in status_text:
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status_code, text = status_text.split(" ", 1)
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status_code = int(status_code)
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else:
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status_code = int(status_text)
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text = ""
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content_type = config.get("content_type", "text/plain")
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return PlainTextResponse(text, status_code=status_code,
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media_type=content_type)
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if "proxy_pass" in config:
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return await self._handle_proxy(request, config, route_match.params)
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if "root" in config:
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return await self._handle_static(request, config)
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if config.get("spa_fallback"):
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return await self._handle_spa_fallback(request, config)
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return PlainTextResponse("404 Not Found", status_code=404)
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async def _handle_static(self, request: Request, config: Dict[str, Any]) -> Response:
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root = Path(config["root"])
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path = request.url.path.lstrip("/")
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if not path or path == "/":
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index_file = config.get("index_file", "index.html")
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file_path = root / index_file
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else:
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file_path = root / path
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try:
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file_path = file_path.resolve()
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root = root.resolve()
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if not str(file_path).startswith(str(root)):
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return PlainTextResponse("403 Forbidden", status_code=403)
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except OSError:
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return PlainTextResponse("404 Not Found", status_code=404)
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if not file_path.exists() or not file_path.is_file():
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return PlainTextResponse("404 Not Found", status_code=404)
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content_type, _ = mimetypes.guess_type(str(file_path))
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response = FileResponse(str(file_path), media_type=content_type)
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if "headers" in config:
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for header in config["headers"]:
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if ":" in header:
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name, value = header.split(":", 1)
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response.headers[name.strip()] = value.strip()
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if "cache_control" in config:
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response.headers["Cache-Control"] = config["cache_control"]
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return response
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async def _handle_spa_fallback(self, request: Request, config: Dict[str, Any]) -> Response:
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path = request.url.path
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exclude_patterns = config.get("exclude_patterns", [])
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for pattern in exclude_patterns:
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if path.startswith(pattern):
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return PlainTextResponse("404 Not Found", status_code=404)
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root = Path(config.get("root", self.static_dir))
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index_file = config.get("index_file", "index.html")
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file_path = root / index_file
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if file_path.exists() and file_path.is_file():
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return FileResponse(str(file_path), media_type="text/html")
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return PlainTextResponse("404 Not Found", status_code=404)
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async def _handle_proxy(self, request: Request, config: Dict[str, Any],
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params: Dict[str, str]) -> Response:
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# TODO: implement real proxying
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proxy_url = config["proxy_pass"]
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for key, value in params.items():
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proxy_url = proxy_url.replace(f"{{{key}}}", value)
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logger.info(f"Proxying request to: {proxy_url}")
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return PlainTextResponse(f"Proxy to: {proxy_url}", status_code=200)
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def create_router_from_config(regex_locations: Dict[str, Dict[str, Any]]) -> Router:
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router = Router()
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for pattern, config in regex_locations.items():
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router.add_route(pattern, config)
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return router
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