142 lines
4 KiB
Python
142 lines
4 KiB
Python
# SPDX-FileCopyrightText: Copyright (c) 2022 Dan Halbert for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""
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`adafruit_httpserver.route`
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====================================================
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* Author(s): Dan Halbert, Michał Pokusa
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"""
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try:
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from typing import Callable, List, Set, Union, Tuple
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except ImportError:
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pass
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import re
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from .methods import GET
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class _Route:
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"""Route definition for different paths, see `adafruit_httpserver.server.Server.route`."""
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def __init__(
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self,
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path: str = "",
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methods: Union[str, Set[str]] = GET,
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append_slash: bool = False,
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) -> None:
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self._validate_path(path)
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self.parameters_names = [
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name[1:-1] for name in re.compile(r"/[^<>]*/?").split(path) if name != ""
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]
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self.path = re.sub(r"<\w*>", r"([^/]*)", path) + ("/?" if append_slash else "")
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self.methods = methods if isinstance(methods, set) else {methods}
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@staticmethod
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def _validate_path(path: str) -> None:
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if not path.startswith("/"):
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raise ValueError("Path must start with a slash.")
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if "<>" in path:
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raise ValueError("All URL parameters must be named.")
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def match(self, other: "_Route") -> Tuple[bool, List[str]]:
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"""
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Checks if the route matches the other route.
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If the route contains parameters, it will check if the ``other`` route contains values for
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them.
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Returns tuple of a boolean and a list of strings. The boolean indicates if the routes match,
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and the list contains the values of the url parameters from the ``other`` route.
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Examples::
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route = _Route("/example", GET)
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other1 = _Route("/example", GET)
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route.matches(other1) # True, []
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other2 = _Route("/other-example", GET)
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route.matches(other2) # False, []
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...
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route = _Route("/example/<parameter>", GET)
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other1 = _Route("/example/123", GET)
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route.matches(other1) # True, ["123"]
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other2 = _Route("/other-example", GET)
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route.matches(other2) # False, []
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"""
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if not other.methods.issubset(self.methods):
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return False, []
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regex_match = re.match(f"^{self.path}$", other.path)
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if regex_match is None:
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return False, []
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return True, regex_match.groups()
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def __repr__(self) -> str:
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path = repr(self.path)
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methods = repr(self.methods)
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return f"_Route(path={path}, methods={methods})"
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class _Routes:
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"""A collection of routes and their corresponding handlers."""
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def __init__(self) -> None:
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self._routes: List[_Route] = []
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self._handlers: List[Callable] = []
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def add(self, route: _Route, handler: Callable):
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"""Adds a route and its handler to the collection."""
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self._routes.append(route)
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self._handlers.append(handler)
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def find_handler(self, route: _Route) -> Union[Callable, None]:
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"""
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Finds a handler for a given route.
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If route used URL parameters, the handler will be wrapped to pass the parameters to the
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handler.
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Example::
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@server.route("/example/<my_parameter>", GET)
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def route_func(request, my_parameter):
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...
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request.path == "/example/123" # True
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my_parameter == "123" # True
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"""
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found_route, _route = False, None
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for _route in self._routes:
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matches, parameters_values = _route.match(route)
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if matches:
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found_route = True
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break
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if not found_route:
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return None
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handler = self._handlers[self._routes.index(_route)]
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keyword_parameters = dict(zip(_route.parameters_names, parameters_values))
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def wrapped_handler(request):
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return handler(request, **keyword_parameters)
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return wrapped_handler
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def __repr__(self) -> str:
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return f"_Routes({repr(self._routes)})"
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