mirror of
https://github.com/graphql-python/graphene-django.git
synced 2024-11-14 05:37:02 +03:00
324 lines
11 KiB
Python
324 lines
11 KiB
Python
import inspect
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import json
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import re
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from django.http import HttpResponse, HttpResponseNotAllowed
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from django.http.response import HttpResponseBadRequest
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from django.shortcuts import render
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from django.utils.decorators import method_decorator
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from django.views.decorators.csrf import ensure_csrf_cookie
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from django.views.generic import View
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from graphql import OperationType, get_operation_ast, parse, validate
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from graphql.error import GraphQLError
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from graphql.error import format_error as format_graphql_error
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from graphql.execution import ExecutionResult
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from graphene import Schema
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from .settings import graphene_settings
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class HttpError(Exception):
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def __init__(self, response, message=None, *args, **kwargs):
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self.response = response
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self.message = message = message or response.content.decode()
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super(HttpError, self).__init__(message, *args, **kwargs)
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def get_accepted_content_types(request):
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def qualify(x):
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parts = x.split(";", 1)
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if len(parts) == 2:
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match = re.match(r"(^|;)q=(0(\.\d{,3})?|1(\.0{,3})?)(;|$)", parts[1])
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if match:
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return parts[0].strip(), float(match.group(2))
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return parts[0].strip(), 1
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raw_content_types = request.META.get("HTTP_ACCEPT", "*/*").split(",")
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qualified_content_types = map(qualify, raw_content_types)
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return list(
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x[0] for x in sorted(qualified_content_types, key=lambda x: x[1], reverse=True)
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)
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def instantiate_middleware(middlewares):
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for middleware in middlewares:
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if inspect.isclass(middleware):
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yield middleware()
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continue
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yield middleware
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class GraphQLView(View):
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graphiql_version = "0.14.0"
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graphiql_template = "graphene/graphiql.html"
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react_version = "16.8.6"
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schema = None
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graphiql = False
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middleware = None
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root_value = None
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pretty = False
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batch = False
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def __init__(
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self,
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schema=None,
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middleware=None,
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root_value=None,
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graphiql=False,
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pretty=False,
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batch=False,
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):
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if not schema:
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schema = graphene_settings.SCHEMA
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if middleware is None:
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middleware = graphene_settings.MIDDLEWARE
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self.schema = self.schema or schema
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if middleware is not None:
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self.middleware = list(instantiate_middleware(middleware))
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self.root_value = root_value
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self.pretty = self.pretty or pretty
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self.graphiql = self.graphiql or graphiql
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self.batch = self.batch or batch
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assert isinstance(
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self.schema, Schema
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), "A Schema is required to be provided to GraphQLView."
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assert not all((graphiql, batch)), "Use either graphiql or batch processing"
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# noinspection PyUnusedLocal
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def get_root_value(self, request):
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return self.root_value
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def get_middleware(self, request):
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return self.middleware
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def get_context(self, request):
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return request
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@method_decorator(ensure_csrf_cookie)
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def dispatch(self, request, *args, **kwargs):
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try:
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if request.method.lower() not in ("get", "post"):
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raise HttpError(
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HttpResponseNotAllowed(
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["GET", "POST"], "GraphQL only supports GET and POST requests."
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)
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)
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data = self.parse_body(request)
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show_graphiql = self.graphiql and self.can_display_graphiql(request, data)
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if show_graphiql:
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return self.render_graphiql(
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request,
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graphiql_version=self.graphiql_version,
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react_version=self.react_version,
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)
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if self.batch:
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responses = [self.get_response(request, entry) for entry in data]
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result = "[{}]".format(
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",".join([response[0] for response in responses])
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)
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status_code = (
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responses
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and max(responses, key=lambda response: response[1])[1]
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or 200
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)
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else:
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result, status_code = self.get_response(request, data, show_graphiql)
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return HttpResponse(
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status=status_code, content=result, content_type="application/json"
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)
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except HttpError as e:
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response = e.response
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response["Content-Type"] = "application/json"
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response.content = self.json_encode(
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request, {"errors": [self.format_error(e)]}
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)
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return response
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def get_response(self, request, data, show_graphiql=False):
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query, variables, operation_name, id = self.get_graphql_params(request, data)
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execution_result = self.execute_graphql_request(
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request, data, query, variables, operation_name, show_graphiql
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)
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status_code = 200
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if execution_result:
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response = {}
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if execution_result.errors:
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response["errors"] = [
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self.format_error(e) for e in execution_result.errors
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]
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if execution_result.errors and any(
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not e.path for e in execution_result.errors
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):
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status_code = 400
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else:
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response["data"] = execution_result.data
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if self.batch:
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response["id"] = id
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response["status"] = status_code
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result = self.json_encode(request, response, pretty=show_graphiql)
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else:
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result = None
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return result, status_code
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def render_graphiql(self, request, **data):
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return render(request, self.graphiql_template, data)
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def json_encode(self, request, d, pretty=False):
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if not (self.pretty or pretty) and not request.GET.get("pretty"):
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return json.dumps(d, separators=(",", ":"))
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return json.dumps(d, sort_keys=True, indent=2, separators=(",", ": "))
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def parse_body(self, request):
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content_type = self.get_content_type(request)
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if content_type == "application/graphql":
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return {"query": request.body.decode()}
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elif content_type == "application/json":
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# noinspection PyBroadException
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try:
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body = request.body.decode("utf-8")
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except Exception as e:
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raise HttpError(HttpResponseBadRequest(str(e)))
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try:
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request_json = json.loads(body)
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if self.batch:
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assert isinstance(request_json, list), (
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"Batch requests should receive a list, but received {}."
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).format(repr(request_json))
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assert (
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len(request_json) > 0
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), "Received an empty list in the batch request."
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else:
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assert isinstance(
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request_json, dict
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), "The received data is not a valid JSON query."
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return request_json
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except AssertionError as e:
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raise HttpError(HttpResponseBadRequest(str(e)))
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except (TypeError, ValueError):
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raise HttpError(HttpResponseBadRequest("POST body sent invalid JSON."))
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elif content_type in [
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"application/x-www-form-urlencoded",
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"multipart/form-data",
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]:
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return request.POST
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return {}
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def execute_graphql_request(
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self, request, data, query, variables, operation_name, show_graphiql=False
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):
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if not query:
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if show_graphiql:
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return None
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raise HttpError(HttpResponseBadRequest("Must provide query string."))
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try:
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document = parse(query)
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except Exception as e:
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return ExecutionResult(errors=[e])
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if request.method.lower() == "get":
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operation_ast = get_operation_ast(document, operation_name)
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if operation_ast and operation_ast.operation != OperationType.QUERY:
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if show_graphiql:
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return None
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raise HttpError(
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HttpResponseNotAllowed(
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["POST"],
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"Can only perform a {} operation from a POST request.".format(
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operation_ast.operation.value
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),
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)
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)
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validation_errors = validate(self.schema.graphql_schema, document)
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if validation_errors:
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return ExecutionResult(data=None, errors=validation_errors)
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return self.schema.execute(
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source=query,
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root_value=self.get_root_value(request),
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variable_values=variables,
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operation_name=operation_name,
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context_value=self.get_context(request),
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middleware=self.get_middleware(request),
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)
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@classmethod
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def can_display_graphiql(cls, request, data):
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raw = "raw" in request.GET or "raw" in data
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return not raw and cls.request_wants_html(request)
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@classmethod
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def request_wants_html(cls, request):
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accepted = get_accepted_content_types(request)
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accepted_length = len(accepted)
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# the list will be ordered in preferred first - so we have to make
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# sure the most preferred gets the highest number
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html_priority = (
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accepted_length - accepted.index("text/html")
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if "text/html" in accepted
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else 0
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)
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json_priority = (
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accepted_length - accepted.index("application/json")
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if "application/json" in accepted
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else 0
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)
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return html_priority > json_priority
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@staticmethod
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def get_graphql_params(request, data):
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query = request.GET.get("query") or data.get("query")
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variables = request.GET.get("variables") or data.get("variables")
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id = request.GET.get("id") or data.get("id")
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if variables and isinstance(variables, str):
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try:
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variables = json.loads(variables)
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except Exception:
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raise HttpError(HttpResponseBadRequest("Variables are invalid JSON."))
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operation_name = request.GET.get("operationName") or data.get("operationName")
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if operation_name == "null":
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operation_name = None
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return query, variables, operation_name, id
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@staticmethod
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def format_error(error):
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if isinstance(error, GraphQLError):
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return format_graphql_error(error)
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return {"message": str(error)}
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@staticmethod
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def get_content_type(request):
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meta = request.META
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content_type = meta.get("CONTENT_TYPE", meta.get("HTTP_CONTENT_TYPE", ""))
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return content_type.split(";", 1)[0].lower()
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