from __future__ import absolute_import, print_function, division import re import six from six.moves import urllib from netlib import multidict from netlib import strutils from netlib.http import multipart from netlib.http import cookies from netlib.http import headers as nheaders from netlib.http import message import netlib.http.url # This regex extracts & splits the host header into host and port. # Handles the edge case of IPv6 addresses containing colons. # https://bugzilla.mozilla.org/show_bug.cgi?id=45891 host_header_re = re.compile(r"^(?P[^:]+|\[.+\])(?::(?P\d+))?$") class RequestData(message.MessageData): def __init__(self, first_line_format, method, scheme, host, port, path, http_version, headers=(), content=None, timestamp_start=None, timestamp_end=None): if isinstance(method, six.text_type): method = method.encode("ascii", "strict") if isinstance(scheme, six.text_type): scheme = scheme.encode("ascii", "strict") if isinstance(host, six.text_type): host = host.encode("idna", "strict") if isinstance(path, six.text_type): path = path.encode("ascii", "strict") if isinstance(http_version, six.text_type): http_version = http_version.encode("ascii", "strict") if not isinstance(headers, nheaders.Headers): headers = nheaders.Headers(headers) if isinstance(content, six.text_type): raise ValueError("Content must be bytes, not {}".format(type(content).__name__)) self.first_line_format = first_line_format self.method = method self.scheme = scheme self.host = host self.port = port self.path = path self.http_version = http_version self.headers = headers self.content = content self.timestamp_start = timestamp_start self.timestamp_end = timestamp_end class Request(message.Message): """ An HTTP request. """ def __init__(self, *args, **kwargs): super(Request, self).__init__() self.data = RequestData(*args, **kwargs) def __repr__(self): if self.host and self.port: hostport = "{}:{}".format(self.host, self.port) else: hostport = "" path = self.path or "" return "Request({} {}{})".format( self.method, hostport, path ) def replace(self, pattern, repl, flags=0): """ Replaces a regular expression pattern with repl in the headers, the request path and the body of the request. Encoded content will be decoded before replacement, and re-encoded afterwards. Returns: The number of replacements made. """ if isinstance(pattern, six.text_type): pattern = strutils.escaped_str_to_bytes(pattern) if isinstance(repl, six.text_type): repl = strutils.escaped_str_to_bytes(repl) c = super(Request, self).replace(pattern, repl, flags) self.path, pc = re.subn( pattern, repl, self.data.path, flags=flags ) c += pc return c @property def first_line_format(self): """ HTTP request form as defined in `RFC7230 `_. origin-form and asterisk-form are subsumed as "relative". """ return self.data.first_line_format @first_line_format.setter def first_line_format(self, first_line_format): self.data.first_line_format = first_line_format @property def method(self): """ HTTP request method, e.g. "GET". """ return message._native(self.data.method).upper() @method.setter def method(self, method): self.data.method = message._always_bytes(method) @property def scheme(self): """ HTTP request scheme, which should be "http" or "https". """ if not self.data.scheme: return self.data.scheme return message._native(self.data.scheme) @scheme.setter def scheme(self, scheme): self.data.scheme = message._always_bytes(scheme) @property def host(self): """ Target host. This may be parsed from the raw request (e.g. from a ``GET http://example.com/ HTTP/1.1`` request line) or inferred from the proxy mode (e.g. an IP in transparent mode). Setting the host attribute also updates the host header, if present. """ if six.PY2: # pragma: no cover return self.data.host if not self.data.host: return self.data.host try: return self.data.host.decode("idna") except UnicodeError: return self.data.host.decode("utf8", "surrogateescape") @host.setter def host(self, host): if isinstance(host, six.text_type): try: # There's no non-strict mode for IDNA encoding. # We don't want this operation to fail though, so we try # utf8 as a last resort. host = host.encode("idna", "strict") except UnicodeError: host = host.encode("utf8", "surrogateescape") self.data.host = host # Update host header if "host" in self.headers: if host: self.headers["host"] = host else: self.headers.pop("host") @property def port(self): """ Target port """ return self.data.port @port.setter def port(self, port): self.data.port = port @property def path(self): """ HTTP request path, e.g. "/index.html". Guaranteed to start with a slash, except for OPTIONS requests, which may just be "*". """ if self.data.path is None: return None else: return message._native(self.data.path) @path.setter def path(self, path): self.data.path = message._always_bytes(path) @property def url(self): """ The URL string, constructed from the request's URL components """ if self.first_line_format == "authority": return "%s:%d" % (self.host, self.port) return netlib.http.url.unparse(self.scheme, self.host, self.port, self.path) @url.setter def url(self, url): self.scheme, self.host, self.port, self.path = netlib.http.url.parse(url) def _parse_host_header(self): """Extract the host and port from Host header""" if "host" not in self.headers: return None, None host, port = self.headers["host"], None m = host_header_re.match(host) if m: host = m.group("host").strip("[]") if m.group("port"): port = int(m.group("port")) return host, port @property def pretty_host(self): """ Similar to :py:attr:`host`, but using the Host headers as an additional preferred data source. This is useful in transparent mode where :py:attr:`host` is only an IP address, but may not reflect the actual destination as the Host header could be spoofed. """ host, port = self._parse_host_header() if not host: return self.host if not port: port = 443 if self.scheme == 'https' else 80 # Prefer the original address if host header has an unexpected form return host if port == self.port else self.host @property def pretty_url(self): """ Like :py:attr:`url`, but using :py:attr:`pretty_host` instead of :py:attr:`host`. """ if self.first_line_format == "authority": return "%s:%d" % (self.pretty_host, self.port) return netlib.http.url.unparse(self.scheme, self.pretty_host, self.port, self.path) @property def query(self): # type: () -> multidict.MultiDictView """ The request query string as an :py:class:`~netlib.multidict.MultiDictView` object. """ return multidict.MultiDictView( self._get_query, self._set_query ) def _get_query(self): _, _, _, _, query, _ = urllib.parse.urlparse(self.url) return tuple(netlib.http.url.decode(query)) def _set_query(self, value): query = netlib.http.url.encode(value) scheme, netloc, path, params, _, fragment = urllib.parse.urlparse(self.url) _, _, _, self.path = netlib.http.url.parse( urllib.parse.urlunparse([scheme, netloc, path, params, query, fragment])) @query.setter def query(self, value): self._set_query(value) @property def cookies(self): # type: () -> multidict.MultiDictView """ The request cookies. An empty :py:class:`~netlib.multidict.MultiDictView` object if the cookie monster ate them all. """ return multidict.MultiDictView( self._get_cookies, self._set_cookies ) def _get_cookies(self): h = self.headers.get_all("Cookie") return tuple(cookies.parse_cookie_headers(h)) def _set_cookies(self, value): self.headers["cookie"] = cookies.format_cookie_header(value) @cookies.setter def cookies(self, value): self._set_cookies(value) @property def path_components(self): """ The URL's path components as a tuple of strings. Components are unquoted. """ _, _, path, _, _, _ = urllib.parse.urlparse(self.url) # This needs to be a tuple so that it's immutable. # Otherwise, this would fail silently: # request.path_components.append("foo") return tuple(urllib.parse.unquote(i) for i in path.split("/") if i) @path_components.setter def path_components(self, components): components = map(lambda x: urllib.parse.quote(x, safe=""), components) path = "/" + "/".join(components) scheme, netloc, _, params, query, fragment = urllib.parse.urlparse(self.url) _, _, _, self.path = netlib.http.url.parse( urllib.parse.urlunparse([scheme, netloc, path, params, query, fragment])) def anticache(self): """ Modifies this request to remove headers that might produce a cached response. That is, we remove ETags and If-Modified-Since headers. """ delheaders = [ "if-modified-since", "if-none-match", ] for i in delheaders: self.headers.pop(i, None) def anticomp(self): """ Modifies this request to remove headers that will compress the resource's data. """ self.headers["accept-encoding"] = "identity" def constrain_encoding(self): """ Limits the permissible Accept-Encoding values, based on what we can decode appropriately. """ accept_encoding = self.headers.get("accept-encoding") if accept_encoding: self.headers["accept-encoding"] = ( ', '.join( e for e in {"gzip", "identity", "deflate"} if e in accept_encoding ) ) @property def urlencoded_form(self): """ The URL-encoded form data as an :py:class:`~netlib.multidict.MultiDictView` object. An empty multidict.MultiDictView if the content-type indicates non-form data or the content could not be parsed. """ return multidict.MultiDictView( self._get_urlencoded_form, self._set_urlencoded_form ) def _get_urlencoded_form(self): is_valid_content_type = "application/x-www-form-urlencoded" in self.headers.get("content-type", "").lower() if is_valid_content_type: try: return tuple(netlib.http.url.decode(self.content)) except ValueError: pass return () def _set_urlencoded_form(self, value): """ Sets the body to the URL-encoded form data, and adds the appropriate content-type header. This will overwrite the existing content if there is one. """ self.headers["content-type"] = "application/x-www-form-urlencoded" self.content = netlib.http.url.encode(value).encode() @urlencoded_form.setter def urlencoded_form(self, value): self._set_urlencoded_form(value) @property def multipart_form(self): """ The multipart form data as an :py:class:`~netlib.multidict.MultiDictView` object. None if the content-type indicates non-form data. """ return multidict.MultiDictView( self._get_multipart_form, self._set_multipart_form ) def _get_multipart_form(self): is_valid_content_type = "multipart/form-data" in self.headers.get("content-type", "").lower() if is_valid_content_type: try: return multipart.decode(self.headers, self.content) except ValueError: pass return () def _set_multipart_form(self, value): raise NotImplementedError() @multipart_form.setter def multipart_form(self, value): self._set_multipart_form(value)