470 lines
14 KiB
Python
470 lines
14 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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""" This module contains base REST classes for constructing REST servlets. """
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import logging
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from typing import Dict, Iterable, List, Optional, overload
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from typing_extensions import Literal
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from twisted.web.server import Request
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from synapse.api.errors import Codes, SynapseError
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from synapse.util import json_decoder
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logger = logging.getLogger(__name__)
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def parse_integer(request, name, default=None, required=False):
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"""Parse an integer parameter from the request string
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Args:
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request: the twisted HTTP request.
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name (bytes/unicode): the name of the query parameter.
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default (int|None): value to use if the parameter is absent, defaults
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to None.
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required (bool): whether to raise a 400 SynapseError if the
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parameter is absent, defaults to False.
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Returns:
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int|None: An int value or the default.
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Raises:
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SynapseError: if the parameter is absent and required, or if the
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parameter is present and not an integer.
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"""
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return parse_integer_from_args(request.args, name, default, required)
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def parse_integer_from_args(args, name, default=None, required=False):
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if not isinstance(name, bytes):
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name = name.encode("ascii")
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if name in args:
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try:
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return int(args[name][0])
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except Exception:
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message = "Query parameter %r must be an integer" % (name,)
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raise SynapseError(400, message, errcode=Codes.INVALID_PARAM)
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else:
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if required:
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message = "Missing integer query parameter %r" % (name,)
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raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
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else:
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return default
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def parse_boolean(request, name, default=None, required=False):
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"""Parse a boolean parameter from the request query string
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Args:
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request: the twisted HTTP request.
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name (bytes/unicode): the name of the query parameter.
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default (bool|None): value to use if the parameter is absent, defaults
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to None.
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required (bool): whether to raise a 400 SynapseError if the
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parameter is absent, defaults to False.
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Returns:
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bool|None: A bool value or the default.
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Raises:
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SynapseError: if the parameter is absent and required, or if the
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parameter is present and not one of "true" or "false".
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"""
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return parse_boolean_from_args(request.args, name, default, required)
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def parse_boolean_from_args(args, name, default=None, required=False):
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if not isinstance(name, bytes):
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name = name.encode("ascii")
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if name in args:
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try:
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return {b"true": True, b"false": False}[args[name][0]]
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except Exception:
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message = (
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"Boolean query parameter %r must be one of ['true', 'false']"
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) % (name,)
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raise SynapseError(400, message)
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else:
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if required:
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message = "Missing boolean query parameter %r" % (name,)
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raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
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else:
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return default
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@overload
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def parse_bytes_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Literal[None] = None,
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required: Literal[True] = True,
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) -> bytes:
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...
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@overload
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def parse_bytes_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[bytes] = None,
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required: bool = False,
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) -> Optional[bytes]:
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...
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def parse_bytes_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[bytes] = None,
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required: bool = False,
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) -> Optional[bytes]:
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"""
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Parse a string parameter as bytes from the request query string.
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Args:
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args: A mapping of request args as bytes to a list of bytes (e.g. request.args).
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name: the name of the query parameter.
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default: value to use if the parameter is absent,
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defaults to None. Must be bytes if encoding is None.
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required: whether to raise a 400 SynapseError if the
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parameter is absent, defaults to False.
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Returns:
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Bytes or the default value.
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Raises:
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SynapseError if the parameter is absent and required.
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"""
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name_bytes = name.encode("ascii")
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if name_bytes in args:
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return args[name_bytes][0]
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elif required:
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message = "Missing string query parameter %s" % (name,)
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raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
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return default
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def parse_string(
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request: Request,
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name: str,
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default: Optional[str] = None,
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required: bool = False,
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allowed_values: Optional[Iterable[str]] = None,
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encoding: str = "ascii",
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):
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"""
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Parse a string parameter from the request query string.
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If encoding is not None, the content of the query param will be
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decoded to Unicode using the encoding, otherwise it will be encoded
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Args:
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request: the twisted HTTP request.
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name: the name of the query parameter.
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default: value to use if the parameter is absent, defaults to None.
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required: whether to raise a 400 SynapseError if the
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parameter is absent, defaults to False.
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allowed_values: List of allowed values for the
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string, or None if any value is allowed, defaults to None. Must be
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the same type as name, if given.
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encoding: The encoding to decode the string content with.
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Returns:
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A string value or the default.
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Raises:
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SynapseError if the parameter is absent and required, or if the
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parameter is present, must be one of a list of allowed values and
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is not one of those allowed values.
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"""
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args = request.args # type: Dict[bytes, List[bytes]] # type: ignore
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return parse_string_from_args(
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args, name, default, required, allowed_values, encoding
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)
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def _parse_string_value(
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value: bytes,
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allowed_values: Optional[Iterable[str]],
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name: str,
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encoding: str,
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) -> str:
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try:
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value_str = value.decode(encoding)
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except ValueError:
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raise SynapseError(400, "Query parameter %r must be %s" % (name, encoding))
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if allowed_values is not None and value_str not in allowed_values:
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message = "Query parameter %r must be one of [%s]" % (
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name,
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", ".join(repr(v) for v in allowed_values),
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)
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raise SynapseError(400, message)
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else:
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return value_str
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@overload
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def parse_strings_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[List[str]] = None,
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required: Literal[True] = True,
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allowed_values: Optional[Iterable[str]] = None,
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encoding: str = "ascii",
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) -> List[str]:
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...
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@overload
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def parse_strings_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[List[str]] = None,
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required: bool = False,
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allowed_values: Optional[Iterable[str]] = None,
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encoding: str = "ascii",
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) -> Optional[List[str]]:
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...
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def parse_strings_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[List[str]] = None,
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required: bool = False,
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allowed_values: Optional[Iterable[str]] = None,
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encoding: str = "ascii",
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) -> Optional[List[str]]:
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"""
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Parse a string parameter from the request query string list.
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The content of the query param will be decoded to Unicode using the encoding.
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Args:
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args: A mapping of request args as bytes to a list of bytes (e.g. request.args).
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name: the name of the query parameter.
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default: value to use if the parameter is absent, defaults to None.
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required: whether to raise a 400 SynapseError if the
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parameter is absent, defaults to False.
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allowed_values: List of allowed values for the
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string, or None if any value is allowed, defaults to None.
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encoding: The encoding to decode the string content with.
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Returns:
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A string value or the default.
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Raises:
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SynapseError if the parameter is absent and required, or if the
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parameter is present, must be one of a list of allowed values and
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is not one of those allowed values.
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"""
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name_bytes = name.encode("ascii")
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if name_bytes in args:
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values = args[name_bytes]
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return [
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_parse_string_value(value, allowed_values, name=name, encoding=encoding)
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for value in values
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]
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else:
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if required:
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message = "Missing string query parameter %r" % (name,)
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raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
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return default
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@overload
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def parse_string_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[str] = None,
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required: Literal[True] = True,
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allowed_values: Optional[Iterable[str]] = None,
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encoding: str = "ascii",
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) -> str:
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...
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@overload
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def parse_string_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[str] = None,
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required: bool = False,
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allowed_values: Optional[Iterable[str]] = None,
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encoding: str = "ascii",
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) -> Optional[str]:
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...
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def parse_string_from_args(
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args: Dict[bytes, List[bytes]],
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name: str,
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default: Optional[str] = None,
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required: bool = False,
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allowed_values: Optional[Iterable[str]] = None,
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encoding: str = "ascii",
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) -> Optional[str]:
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"""
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Parse the string parameter from the request query string list
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and return the first result.
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The content of the query param will be decoded to Unicode using the encoding.
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Args:
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args: A mapping of request args as bytes to a list of bytes (e.g. request.args).
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name: the name of the query parameter.
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default: value to use if the parameter is absent, defaults to None.
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required: whether to raise a 400 SynapseError if the
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parameter is absent, defaults to False.
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allowed_values: List of allowed values for the
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string, or None if any value is allowed, defaults to None. Must be
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the same type as name, if given.
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encoding: The encoding to decode the string content with.
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Returns:
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A string value or the default.
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Raises:
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SynapseError if the parameter is absent and required, or if the
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parameter is present, must be one of a list of allowed values and
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is not one of those allowed values.
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"""
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strings = parse_strings_from_args(
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args,
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name,
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default=[default] if default is not None else None,
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required=required,
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allowed_values=allowed_values,
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encoding=encoding,
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)
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if strings is None:
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return None
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return strings[0]
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def parse_json_value_from_request(request, allow_empty_body=False):
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"""Parse a JSON value from the body of a twisted HTTP request.
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Args:
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request: the twisted HTTP request.
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allow_empty_body (bool): if True, an empty body will be accepted and
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turned into None
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Returns:
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The JSON value.
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Raises:
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SynapseError if the request body couldn't be decoded as JSON.
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"""
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try:
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content_bytes = request.content.read()
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except Exception:
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raise SynapseError(400, "Error reading JSON content.")
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if not content_bytes and allow_empty_body:
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return None
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try:
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content = json_decoder.decode(content_bytes.decode("utf-8"))
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except Exception as e:
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logger.warning("Unable to parse JSON: %s (%s)", e, content_bytes)
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raise SynapseError(400, "Content not JSON.", errcode=Codes.NOT_JSON)
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return content
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def parse_json_object_from_request(request, allow_empty_body=False):
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"""Parse a JSON object from the body of a twisted HTTP request.
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Args:
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request: the twisted HTTP request.
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allow_empty_body (bool): if True, an empty body will be accepted and
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turned into an empty dict.
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Raises:
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SynapseError if the request body couldn't be decoded as JSON or
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if it wasn't a JSON object.
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"""
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content = parse_json_value_from_request(request, allow_empty_body=allow_empty_body)
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if allow_empty_body and content is None:
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return {}
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if type(content) != dict:
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message = "Content must be a JSON object."
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raise SynapseError(400, message, errcode=Codes.BAD_JSON)
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return content
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def assert_params_in_dict(body, required):
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absent = []
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for k in required:
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if k not in body:
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absent.append(k)
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if len(absent) > 0:
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raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
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class RestServlet:
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"""A Synapse REST Servlet.
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An implementing class can either provide its own custom 'register' method,
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or use the automatic pattern handling provided by the base class.
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To use this latter, the implementing class instead provides a `PATTERN`
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class attribute containing a pre-compiled regular expression. The automatic
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register method will then use this method to register any of the following
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instance methods associated with the corresponding HTTP method:
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on_GET
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on_PUT
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on_POST
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on_DELETE
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Automatically handles turning CodeMessageExceptions thrown by these methods
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into the appropriate HTTP response.
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"""
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def register(self, http_server):
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"""Register this servlet with the given HTTP server."""
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patterns = getattr(self, "PATTERNS", None)
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if patterns:
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for method in ("GET", "PUT", "POST", "DELETE"):
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if hasattr(self, "on_%s" % (method,)):
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servlet_classname = self.__class__.__name__
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method_handler = getattr(self, "on_%s" % (method,))
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http_server.register_paths(
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method, patterns, method_handler, servlet_classname
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)
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else:
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raise NotImplementedError("RestServlet must register something.")
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