Source code for flask_restx.reqparse

import decimal

    from import Hashable
except ImportError:
    from collections import Hashable
from copy import deepcopy
from flask import current_app, request

from werkzeug.datastructures import MultiDict, FileStorage
from werkzeug import exceptions

from .errors import abort, SpecsError
from .marshalling import marshal
from .model import Model
from ._http import HTTPStatus

[docs]class ParseResult(dict): """ The default result container as an Object dict. """ def __getattr__(self, name): try: return self[name] except KeyError: raise AttributeError(name) def __setattr__(self, name, value): self[name] = value
_friendly_location = { "json": "the JSON body", "form": "the post body", "args": "the query string", "values": "the post body or the query string", "headers": "the HTTP headers", "cookies": "the request's cookies", "files": "an uploaded file", } #: Maps Flask-RESTX RequestParser locations to Swagger ones LOCATIONS = { "args": "query", "form": "formData", "headers": "header", "json": "body", "values": "query", "files": "formData", } #: Maps Python primitives types to Swagger ones PY_TYPES = { int: "integer", str: "string", bool: "boolean", float: "number", None: "void", } SPLIT_CHAR = ","
[docs]class Argument(object): """ :param name: Either a name or a list of option strings, e.g. foo or -f, --foo. :param default: The value produced if the argument is absent from the request. :param dest: The name of the attribute to be added to the object returned by :meth:`~reqparse.RequestParser.parse_args()`. :param bool required: Whether or not the argument may be omitted (optionals only). :param string action: The basic type of action to be taken when this argument is encountered in the request. Valid options are "store" and "append". :param bool ignore: Whether to ignore cases where the argument fails type conversion :param type: The type to which the request argument should be converted. If a type raises an exception, the message in the error will be returned in the response. Defaults to :class:`str`. :param location: The attributes of the :class:`flask.Request` object to source the arguments from (ex: headers, args, etc.), can be an iterator. The last item listed takes precedence in the result set. :param choices: A container of the allowable values for the argument. :param help: A brief description of the argument, returned in the response when the argument is invalid. May optionally contain an "{error_msg}" interpolation token, which will be replaced with the text of the error raised by the type converter. :param bool case_sensitive: Whether argument values in the request are case sensitive or not (this will convert all values to lowercase) :param bool store_missing: Whether the arguments default value should be stored if the argument is missing from the request. :param bool trim: If enabled, trims whitespace around the argument. :param bool nullable: If enabled, allows null value in argument. """ def __init__( self, name, default=None, dest=None, required=False, ignore=False, type=str, location=( "json", "values", ), choices=(), action="store", help=None, operators=("=",), case_sensitive=True, store_missing=True, trim=False, nullable=True, ): = name self.default = default self.dest = dest self.required = required self.ignore = ignore self.location = location self.type = type self.choices = choices self.action = action = help self.case_sensitive = case_sensitive self.operators = operators self.store_missing = store_missing self.trim = trim self.nullable = nullable
[docs] def source(self, request): """ Pulls values off the request in the provided location :param request: The flask request object to parse arguments from """ if isinstance(self.location, str): if self.location in {"json", "get_json"}: value = request.get_json(silent=True) else: value = getattr(request, self.location, MultiDict()) if callable(value): value = value() if value is not None: return value else: values = MultiDict() for l in self.location: if l in {"json", "get_json"}: value = request.get_json(silent=True) else: value = getattr(request, l, None) if callable(value): value = value() if value is not None: values.update(value) return values return MultiDict()
def convert(self, value, op): # Don't cast None if value is None: if not self.nullable: raise ValueError("Must not be null!") return None elif isinstance(self.type, Model) and isinstance(value, dict): return marshal(value, self.type) # and check if we're expecting a filestorage and haven't overridden `type` # (required because the below instantiation isn't valid for FileStorage) elif isinstance(value, FileStorage) and self.type == FileStorage: return value try: return self.type(value,, op) except TypeError: try: if self.type is decimal.Decimal: return self.type(str(value), else: return self.type(value, except TypeError: return self.type(value)
[docs] def handle_validation_error(self, error, bundle_errors): """ Called when an error is raised while parsing. Aborts the request with a 400 status and an error message :param error: the error that was raised :param bool bundle_errors: do not abort when first error occurs, return a dict with the name of the argument and the error message to be bundled """ error_str = str(error) error_msg = " ".join([str(, error_str]) if else error_str errors = { error_msg} if bundle_errors: return ValueError(error), errors abort(HTTPStatus.BAD_REQUEST, "Input payload validation failed", errors=errors)
[docs] def parse(self, request, bundle_errors=False): """ Parses argument value(s) from the request, converting according to the argument's type. :param request: The flask request object to parse arguments from :param bool bundle_errors: do not abort when first error occurs, return a dict with the name of the argument and the error message to be bundled """ bundle_errors = current_app.config.get("BUNDLE_ERRORS", False) or bundle_errors source = self.source(request) results = [] # Sentinels _not_found = False _found = True for operator in self.operators: name = + operator.replace("=", "", 1) if name in source: # Account for MultiDict and regular dict if hasattr(source, "getlist"): values = source.getlist(name) else: values = [source.get(name)] for value in values: if hasattr(value, "strip") and self.trim: value = value.strip() if hasattr(value, "lower") and not self.case_sensitive: value = value.lower() if hasattr(self.choices, "__iter__"): self.choices = [choice.lower() for choice in self.choices] try: if self.action == "split": value = [ self.convert(v, operator) for v in value.split(SPLIT_CHAR) ] else: value = self.convert(value, operator) except Exception as error: if self.ignore: continue return self.handle_validation_error(error, bundle_errors) if self.choices and value not in self.choices: msg = "The value '{0}' is not a valid choice for '{1}'.".format( value, name ) return self.handle_validation_error(msg, bundle_errors) if name in request.unparsed_arguments: request.unparsed_arguments.pop(name) results.append(value) if not results and self.required: if isinstance(self.location, str): location = _friendly_location.get(self.location, self.location) else: locations = [_friendly_location.get(loc, loc) for loc in self.location] location = " or ".join(locations) error_msg = "Missing required parameter in {0}".format(location) return self.handle_validation_error(error_msg, bundle_errors) if not results: if callable(self.default): return self.default(), _not_found else: return self.default, _not_found if self.action == "append": return results, _found if self.action == "store" or len(results) == 1: return results[0], _found return results, _found
@property def __schema__(self): if self.location == "cookie": return param = {"name":, "in": LOCATIONS.get(self.location, "query")} _handle_arg_type(self, param) if self.required: param["required"] = True if param["description"] = if self.default is not None: param["default"] = ( self.default() if callable(self.default) else self.default ) if self.action == "append": param["items"] = {"type": param["type"]} if "pattern" in param: param["items"]["pattern"] = param.pop("pattern") param["type"] = "array" param["collectionFormat"] = "multi" if self.action == "split": param["items"] = {"type": param["type"]} param["type"] = "array" param["collectionFormat"] = "csv" if self.choices: param["enum"] = self.choices return param
[docs]class RequestParser(object): """ Enables adding and parsing of multiple arguments in the context of a single request. Ex:: from flask_restx import RequestParser parser = RequestParser() parser.add_argument('foo') parser.add_argument('int_bar', type=int) args = parser.parse_args() :param bool trim: If enabled, trims whitespace on all arguments in this parser :param bool bundle_errors: If enabled, do not abort when first error occurs, return a dict with the name of the argument and the error message to be bundled and return all validation errors """ def __init__( self, argument_class=Argument, result_class=ParseResult, trim=False, bundle_errors=False, ): self.args = [] self.argument_class = argument_class self.result_class = result_class self.trim = trim self.bundle_errors = bundle_errors
[docs] def add_argument(self, *args, **kwargs): """ Adds an argument to be parsed. Accepts either a single instance of Argument or arguments to be passed into :class:`Argument`'s constructor. See :class:`Argument`'s constructor for documentation on the available options. """ if len(args) == 1 and isinstance(args[0], self.argument_class): self.args.append(args[0]) else: self.args.append(self.argument_class(*args, **kwargs)) # Do not know what other argument classes are out there if self.trim and self.argument_class is Argument: # enable trim for appended element self.args[-1].trim = kwargs.get("trim", self.trim) return self
[docs] def parse_args(self, req=None, strict=False): """ Parse all arguments from the provided request and return the results as a ParseResult :param bool strict: if req includes args not in parser, throw 400 BadRequest exception :return: the parsed results as :class:`ParseResult` (or any class defined as :attr:`result_class`) :rtype: ParseResult """ if req is None: req = request result = self.result_class() # A record of arguments not yet parsed; as each is found # among self.args, it will be popped out req.unparsed_arguments = ( dict(self.argument_class("").source(req)) if strict else {} ) errors = {} for arg in self.args: value, found = arg.parse(req, self.bundle_errors) if isinstance(value, ValueError): errors.update(found) found = None if found or arg.store_missing: result[arg.dest or] = value if errors: abort( HTTPStatus.BAD_REQUEST, "Input payload validation failed", errors=errors ) if strict and req.unparsed_arguments: arguments = ", ".join(req.unparsed_arguments.keys()) msg = "Unknown arguments: {0}".format(arguments) raise exceptions.BadRequest(msg) return result
[docs] def copy(self): """Creates a copy of this RequestParser with the same set of arguments""" parser_copy = self.__class__(self.argument_class, self.result_class) parser_copy.args = deepcopy(self.args) parser_copy.trim = self.trim parser_copy.bundle_errors = self.bundle_errors return parser_copy
[docs] def replace_argument(self, name, *args, **kwargs): """Replace the argument matching the given name with a new version.""" new_arg = self.argument_class(name, *args, **kwargs) for index, arg in enumerate(self.args[:]): if == del self.args[index] self.args.append(new_arg) break return self
[docs] def remove_argument(self, name): """Remove the argument matching the given name.""" for index, arg in enumerate(self.args[:]): if name == del self.args[index] break return self
@property def __schema__(self): params = [] locations = set() for arg in self.args: param = arg.__schema__ if param: params.append(param) locations.add(param["in"]) if "body" in locations and "formData" in locations: raise SpecsError("Can't use formData and body at the same time") return params
def _handle_arg_type(arg, param): if isinstance(arg.type, Hashable) and arg.type in PY_TYPES: param["type"] = PY_TYPES[arg.type] elif hasattr(arg.type, "__apidoc__"): param["type"] = arg.type.__apidoc__["name"] param["in"] = "body" elif hasattr(arg.type, "__schema__"): param.update(arg.type.__schema__) elif arg.location == "files": param["type"] = "file" else: param["type"] = "string"