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import asyncio
import marshmallow as ma
from django.http import HttpResponse
from django.views.generic import View
from webargs import fields, validate
from webargs.core import json
from webargs.djangoparser import parser, use_args, use_kwargs
hello_args = {"name": fields.Str(load_default="World", validate=validate.Length(min=3))}
hello_multiple = {"name": fields.List(fields.Str())}
class HelloSchema(ma.Schema):
name = fields.Str(load_default="World", validate=validate.Length(min=3))
hello_many_schema = HelloSchema(many=True)
# variant which ignores unknown fields
hello_exclude_schema = HelloSchema(unknown=ma.EXCLUDE)
def json_response(data, **kwargs):
return HttpResponse(json.dumps(data), content_type="application/json", **kwargs)
def handle_view_errors(f):
if asyncio.iscoroutinefunction(f):
async def wrapped(*args, **kwargs):
try:
return await f(*args, **kwargs)
except ma.ValidationError as err:
return json_response(err.messages, status=422)
except json.JSONDecodeError:
return json_response({"json": ["Invalid JSON body."]}, status=400)
else:
def wrapped(*args, **kwargs):
try:
return f(*args, **kwargs)
except ma.ValidationError as err:
return json_response(err.messages, status=422)
except json.JSONDecodeError:
return json_response({"json": ["Invalid JSON body."]}, status=400)
return wrapped
@handle_view_errors
def echo(request):
return json_response(parser.parse(hello_args, request, location="query"))
@handle_view_errors
async def async_echo(request):
return json_response(
await parser.async_parse(hello_args, request, location="query")
)
@handle_view_errors
def echo_form(request):
return json_response(parser.parse(hello_args, request, location="form"))
@handle_view_errors
def echo_json(request):
return json_response(parser.parse(hello_args, request, location="json"))
@handle_view_errors
def echo_json_or_form(request):
return json_response(parser.parse(hello_args, request, location="json_or_form"))
@handle_view_errors
@use_args(hello_args, location="query")
def echo_use_args(request, args):
return json_response(args)
@handle_view_errors
@use_args(hello_args, location="query")
async def async_echo_use_args(request, args):
return json_response(args)
@handle_view_errors
@use_args(
{"value": fields.Int()}, validate=lambda args: args["value"] > 42, location="form"
)
def echo_use_args_validated(args):
return json_response(args)
@handle_view_errors
def echo_ignoring_extra_data(request):
return json_response(parser.parse(hello_exclude_schema, request, unknown=None))
@handle_view_errors
@use_kwargs(hello_args, location="query")
def echo_use_kwargs(request, name):
return json_response({"name": name})
@handle_view_errors
def echo_multi(request):
return json_response(parser.parse(hello_multiple, request, location="query"))
@handle_view_errors
def echo_multi_form(request):
return json_response(parser.parse(hello_multiple, request, location="form"))
@handle_view_errors
def echo_multi_json(request):
return json_response(parser.parse(hello_multiple, request))
@handle_view_errors
def echo_many_schema(request):
return json_response(parser.parse(hello_many_schema, request))
@handle_view_errors
@use_args({"value": fields.Int()}, location="query")
def echo_use_args_with_path_param(request, args, name):
return json_response(args)
@handle_view_errors
@use_kwargs({"value": fields.Int()}, location="query")
def echo_use_kwargs_with_path_param(request, value, name):
return json_response({"value": value})
@handle_view_errors
def always_error(request):
def always_fail(value):
raise ma.ValidationError("something went wrong")
argmap = {"text": fields.Str(validate=always_fail)}
return parser.parse(argmap, request)
@handle_view_errors
def echo_headers(request):
return json_response(parser.parse(hello_args, request, location="headers"))
@handle_view_errors
def echo_cookie(request):
return json_response(parser.parse(hello_args, request, location="cookies"))
@handle_view_errors
def echo_file(request):
args = {"myfile": fields.Raw()}
result = parser.parse(args, request, location="files")
myfile = result["myfile"]
content = myfile.read().decode("utf8")
return json_response({"myfile": content})
@handle_view_errors
def echo_nested(request):
argmap = {"name": fields.Nested({"first": fields.Str(), "last": fields.Str()})}
return json_response(parser.parse(argmap, request))
@handle_view_errors
def echo_nested_many(request):
argmap = {
"users": fields.Nested({"id": fields.Int(), "name": fields.Str()}, many=True)
}
return json_response(parser.parse(argmap, request))
class EchoCBV(View):
@handle_view_errors
def get(self, request):
location_kwarg = {} if request.method == "POST" else {"location": "query"}
return json_response(parser.parse(hello_args, self.request, **location_kwarg))
post = get
class EchoUseArgsCBV(View):
@handle_view_errors
@use_args(hello_args, location="query")
def get(self, request, args):
return json_response(args)
@handle_view_errors
@use_args(hello_args)
def post(self, request, args):
return json_response(args)
class EchoUseArgsWithParamCBV(View):
@handle_view_errors
@use_args(hello_args, location="query")
def get(self, request, args, pid):
return json_response(args)
@handle_view_errors
@use_args(hello_args)
def post(self, request, args, pid):
return json_response(args)
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