diff options
Diffstat (limited to 'synapse/http/servlet.py')
| -rw-r--r-- | synapse/http/servlet.py | 196 |
1 files changed, 153 insertions, 43 deletions
diff --git a/synapse/http/servlet.py b/synapse/http/servlet.py index 31897546a9..3f4f2411fc 100644 --- a/synapse/http/servlet.py +++ b/synapse/http/servlet.py @@ -15,6 +15,9 @@ """ This module contains base REST classes for constructing REST servlets. """ import logging +from typing import Iterable, List, Optional, Union, overload + +from typing_extensions import Literal from synapse.api.errors import Codes, SynapseError from synapse.util import json_decoder @@ -107,12 +110,11 @@ def parse_boolean_from_args(args, name, default=None, required=False): def parse_string( request, - name, - default=None, - required=False, - allowed_values=None, - param_type="string", - encoding="ascii", + name: Union[bytes, str], + default: Optional[str] = None, + required: bool = False, + allowed_values: Optional[Iterable[str]] = None, + encoding: Optional[str] = "ascii", ): """ Parse a string parameter from the request query string. @@ -122,18 +124,17 @@ def parse_string( Args: request: the twisted HTTP request. - name (bytes|unicode): the name of the query parameter. - default (bytes|unicode|None): value to use if the parameter is absent, + name: the name of the query parameter. + default: value to use if the parameter is absent, defaults to None. Must be bytes if encoding is None. - required (bool): whether to raise a 400 SynapseError if the + required: whether to raise a 400 SynapseError if the parameter is absent, defaults to False. - allowed_values (list[bytes|unicode]): List of allowed values for the + allowed_values: List of allowed values for the string, or None if any value is allowed, defaults to None. Must be the same type as name, if given. - encoding (str|None): The encoding to decode the string content with. - + encoding : The encoding to decode the string content with. Returns: - bytes/unicode|None: A string value or the default. Unicode if encoding + A string value or the default. Unicode if encoding was given, bytes otherwise. Raises: @@ -142,45 +143,105 @@ def parse_string( is not one of those allowed values. """ return parse_string_from_args( - request.args, name, default, required, allowed_values, param_type, encoding + request.args, name, default, required, allowed_values, encoding ) -def parse_string_from_args( - args, - name, - default=None, - required=False, - allowed_values=None, - param_type="string", - encoding="ascii", -): +def _parse_string_value( + value: Union[str, bytes], + allowed_values: Optional[Iterable[str]], + name: str, + encoding: Optional[str], +) -> Union[str, bytes]: + if encoding: + try: + value = value.decode(encoding) + except ValueError: + raise SynapseError(400, "Query parameter %r must be %s" % (name, encoding)) + + if allowed_values is not None and value not in allowed_values: + message = "Query parameter %r must be one of [%s]" % ( + name, + ", ".join(repr(v) for v in allowed_values), + ) + raise SynapseError(400, message) + else: + return value + + +@overload +def parse_strings_from_args( + args: List[str], + name: Union[bytes, str], + default: Optional[List[str]] = None, + required: bool = False, + allowed_values: Optional[Iterable[str]] = None, + encoding: Literal[None] = None, +) -> Optional[List[bytes]]: + ... + + +@overload +def parse_strings_from_args( + args: List[str], + name: Union[bytes, str], + default: Optional[List[str]] = None, + required: bool = False, + allowed_values: Optional[Iterable[str]] = None, + encoding: str = "ascii", +) -> Optional[List[str]]: + ... + + +def parse_strings_from_args( + args: List[str], + name: Union[bytes, str], + default: Optional[List[str]] = None, + required: bool = False, + allowed_values: Optional[Iterable[str]] = None, + encoding: Optional[str] = "ascii", +) -> Optional[List[Union[bytes, str]]]: + """ + Parse a string parameter from the request query string list. + + If encoding is not None, the content of the query param will be + decoded to Unicode using the encoding, otherwise it will be encoded + + Args: + args: the twisted HTTP request.args list. + name: the name of the query parameter. + default: value to use if the parameter is absent, + defaults to None. Must be bytes if encoding is None. + required : whether to raise a 400 SynapseError if the + parameter is absent, defaults to False. + allowed_values (list[bytes|unicode]): List of allowed values for the + string, or None if any value is allowed, defaults to None. Must be + the same type as name, if given. + encoding: The encoding to decode the string content with. + + Returns: + A string value or the default. Unicode if encoding + was given, bytes otherwise. + + Raises: + SynapseError if the parameter is absent and required, or if the + parameter is present, must be one of a list of allowed values and + is not one of those allowed values. + """ if not isinstance(name, bytes): name = name.encode("ascii") if name in args: - value = args[name][0] - - if encoding: - try: - value = value.decode(encoding) - except ValueError: - raise SynapseError( - 400, "Query parameter %r must be %s" % (name, encoding) - ) - - if allowed_values is not None and value not in allowed_values: - message = "Query parameter %r must be one of [%s]" % ( - name, - ", ".join(repr(v) for v in allowed_values), - ) - raise SynapseError(400, message) - else: - return value + values = args[name] + + return [ + _parse_string_value(value, allowed_values, name=name, encoding=encoding) + for value in values + ] else: if required: - message = "Missing %s query parameter %r" % (param_type, name) + message = "Missing string query parameter %r" % (name) raise SynapseError(400, message, errcode=Codes.MISSING_PARAM) else: @@ -190,6 +251,55 @@ def parse_string_from_args( return default +def parse_string_from_args( + args: List[str], + name: Union[bytes, str], + default: Optional[str] = None, + required: bool = False, + allowed_values: Optional[Iterable[str]] = None, + encoding: Optional[str] = "ascii", +) -> Optional[Union[bytes, str]]: + """ + Parse the string parameter from the request query string list + and return the first result. + + If encoding is not None, the content of the query param will be + decoded to Unicode using the encoding, otherwise it will be encoded + + Args: + args: the twisted HTTP request.args list. + name: the name of the query parameter. + default: value to use if the parameter is absent, + defaults to None. Must be bytes if encoding is None. + required: whether to raise a 400 SynapseError if the + parameter is absent, defaults to False. + allowed_values: List of allowed values for the + string, or None if any value is allowed, defaults to None. Must be + the same type as name, if given. + encoding: The encoding to decode the string content with. + + Returns: + A string value or the default. Unicode if encoding + was given, bytes otherwise. + + Raises: + SynapseError if the parameter is absent and required, or if the + parameter is present, must be one of a list of allowed values and + is not one of those allowed values. + """ + + strings = parse_strings_from_args( + args, + name, + default=[default], + required=required, + allowed_values=allowed_values, + encoding=encoding, + ) + + return strings[0] + + def parse_json_value_from_request(request, allow_empty_body=False): """Parse a JSON value from the body of a twisted HTTP request. @@ -215,7 +325,7 @@ def parse_json_value_from_request(request, allow_empty_body=False): try: content = json_decoder.decode(content_bytes.decode("utf-8")) except Exception as e: - logger.warning("Unable to parse JSON: %s", e) + logger.warning("Unable to parse JSON: %s (%s)", e, content_bytes) raise SynapseError(400, "Content not JSON.", errcode=Codes.NOT_JSON) return content |