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process-request.ts
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process-request.ts
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import {
execute as defaultExecute,
getOperationAST,
parse as defaultParse,
subscribe as defaultSubscribe,
validate as defaultValidate,
DocumentNode,
GraphQLError,
GraphQLSchema,
OperationDefinitionNode,
ValidationRule,
ExecutionResult,
} from "graphql";
import { stopAsyncIteration, isAsyncIterable, isHttpMethod } from "./util/index";
import { HttpError } from "./errors";
import {
ExecutionContext,
ExecutionPatchResult,
MultipartResponse,
ProcessRequestOptions,
ProcessRequestResult,
Request,
} from "./types";
import { getRankedResponseProtocols, RankedResponseProtocols } from "./util/get-ranked-response-protocols";
const parseQuery = (query: string | DocumentNode, parse: typeof defaultParse): DocumentNode | Promise<DocumentNode> => {
if (typeof query !== "string" && query.kind === "Document") {
return query;
}
try {
const parseResult = parse(query as string);
if (parseResult instanceof Promise) {
return parseResult.catch((syntaxError) => {
throw new HttpError(400, "GraphQL syntax error.", {
graphqlErrors: [syntaxError],
});
});
}
return parseResult;
} catch (syntaxError) {
throw new HttpError(400, "GraphQL syntax error.", {
graphqlErrors: [syntaxError as GraphQLError],
});
}
};
export const validateDocument = (
schema: GraphQLSchema,
document: DocumentNode,
validate: typeof defaultValidate,
validationRules?: readonly ValidationRule[]
): void => {
const validationErrors = validate(schema, document, validationRules);
if (validationErrors.length) {
throw new HttpError(400, "GraphQL validation error.", {
graphqlErrors: validationErrors,
});
}
};
const getExecutableOperation = (document: DocumentNode, operationName?: string): OperationDefinitionNode => {
const operation = getOperationAST(document, operationName);
if (!operation) {
throw new HttpError(400, "Could not determine what operation to execute.");
}
return operation;
};
// If clients do not accept application/graphql+json use application/json - otherwise respect the order in the accept header
const getSingleResponseContentType = (protocols: RankedResponseProtocols): "application/graphql+json" | "application/json" => {
if (protocols["application/graphql+json"] === -1) {
return "application/json";
}
return protocols["application/graphql+json"] > protocols["application/json"] ? "application/graphql+json" : "application/json";
};
const getHeader = (request: Request, headerName: string): unknown =>
typeof request.headers.get === "function" ? request.headers.get(headerName) : (request.headers as any)[headerName];
export const processRequest = async <TContext = {}, TRootValue = {}>(
options: ProcessRequestOptions<TContext, TRootValue>
): Promise<ProcessRequestResult<TContext, TRootValue>> => {
const {
contextFactory,
execute = defaultExecute,
formatPayload = ({ payload }) => payload,
operationName,
extensions,
parse = defaultParse,
query,
request,
rootValueFactory,
schema,
subscribe = defaultSubscribe,
validate = defaultValidate,
validationRules,
variables,
allowedSubscriptionHttpMethods = ["GET", "POST"],
} = options;
let context: TContext | undefined;
let rootValue: TRootValue | undefined;
let document: DocumentNode | undefined;
let operation: OperationDefinitionNode | undefined;
const result = await (async (): Promise<ProcessRequestResult<TContext, TRootValue>> => {
const accept: unknown = getHeader(request, "accept");
const contentType: unknown = getHeader(request, "contentType");
const rankedProtocols = getRankedResponseProtocols(accept, contentType);
const isEventStreamAccepted = rankedProtocols["text/event-stream"] !== -1;
const defaultSingleResponseHeaders = [
{
name: "Content-Type",
value: getSingleResponseContentType(rankedProtocols),
},
];
try {
if (!isHttpMethod("GET", request.method) && !isHttpMethod("POST", request.method)) {
throw new HttpError(405, "GraphQL only supports GET and POST requests.", {
headers: [...defaultSingleResponseHeaders, { name: "Allow", value: "GET, POST" }],
});
}
if (query == null) {
throw new HttpError(400, "Must provide query string.", { headers: defaultSingleResponseHeaders });
}
document = await parseQuery(query, parse);
validateDocument(schema, document, validate, validationRules);
operation = getExecutableOperation(document, operationName);
if (operation.operation === "mutation" && isHttpMethod("GET", request.method)) {
throw new HttpError(405, "Can only perform a mutation operation from a POST request.", {
headers: [...defaultSingleResponseHeaders, { name: "Allow", value: "POST" }],
});
}
let variableValues: { [name: string]: any } | undefined;
try {
if (variables) {
variableValues = typeof variables === "string" ? JSON.parse(variables) : variables;
}
} catch (_error) {
throw new HttpError(400, "Variables are invalid JSON.", {
headers: defaultSingleResponseHeaders,
});
}
try {
const executionContext: ExecutionContext = {
request,
document,
operation,
operationName,
extensions,
variables: variableValues,
};
context = contextFactory ? await contextFactory(executionContext) : ({} as TContext);
rootValue = rootValueFactory ? await rootValueFactory(executionContext) : ({} as TRootValue);
if (operation.operation === "subscription") {
if (!allowedSubscriptionHttpMethods.some((method) => isHttpMethod(method, request.method))) {
throw new HttpError(
405,
`Can only perform subscription operation from a ${allowedSubscriptionHttpMethods.join(" or ")} request.`,
{
headers: [
...defaultSingleResponseHeaders,
{
name: "Allow",
value: allowedSubscriptionHttpMethods.join(", "),
},
],
}
);
}
const result = await subscribe({
schema,
document,
rootValue,
contextValue: context,
variableValues,
operationName,
});
// If errors are encountered while subscribing to the operation, an execution result
// instead of an AsyncIterable.
if (isAsyncIterable<ExecutionResult>(result)) {
return {
type: "PUSH",
subscribe: async (onResult) => {
try {
for await (const payload of result) {
onResult(
formatPayload({
payload,
context,
rootValue,
document,
operation,
})
);
}
} catch (error) {
const payload: ExecutionResult<any> = {
errors: ((error as HttpError).graphqlErrors as GraphQLError[]) || [
new GraphQLError((error as Error).message),
],
};
onResult(
formatPayload({
payload,
context,
rootValue,
document,
operation,
})
);
stopAsyncIteration(result);
}
},
unsubscribe: () => {
stopAsyncIteration(result);
},
};
}
return {
type: "PUSH",
subscribe: async (onResult) => {
onResult(
formatPayload({
payload: result,
context,
rootValue,
document,
operation,
})
);
},
unsubscribe: () => undefined,
};
} else {
const result = await execute({
schema,
document,
rootValue,
contextValue: context,
variableValues,
operationName,
});
// Operations that use @defer, @stream and @live will return an `AsyncIterable` instead of an
// execution result.
if (isAsyncIterable<ExecutionPatchResult>(result)) {
return {
type: isHttpMethod("GET", request.method) ? "PUSH" : "MULTIPART_RESPONSE",
subscribe: async (onResult) => {
for await (const payload of result) {
onResult(
formatPayload({
payload,
context,
rootValue,
document,
operation,
})
);
}
},
unsubscribe: () => {
stopAsyncIteration(result);
},
} as MultipartResponse<TContext, TRootValue>;
} else {
return {
type: "RESPONSE",
status: 200,
headers: defaultSingleResponseHeaders,
payload: formatPayload({
payload: result,
context,
rootValue,
document,
operation,
}),
};
}
}
} catch (executionError) {
if (executionError instanceof GraphQLError) {
throw new HttpError(200, "GraphQLError encountered white executed GraphQL request.", {
graphqlErrors: [executionError],
headers: defaultSingleResponseHeaders,
});
} else if (executionError instanceof HttpError) {
throw executionError;
} else {
throw new HttpError(500, "Unexpected error encountered while executing GraphQL request.", {
graphqlErrors: [new GraphQLError((executionError as Error).message)],
headers: defaultSingleResponseHeaders,
});
}
}
} catch (error) {
const payload: ExecutionResult<any> = {
errors: ((error as HttpError).graphqlErrors as GraphQLError[]) || [new GraphQLError((error as Error).message)],
};
if (isEventStreamAccepted) {
return {
type: "PUSH",
subscribe: async (onResult) => {
onResult(
formatPayload({
payload,
context,
rootValue,
document,
operation,
})
);
},
unsubscribe: () => undefined,
};
} else {
return {
type: "RESPONSE",
status: (error as HttpError).status || 500,
headers: (error as HttpError).headers || [],
payload: formatPayload({
payload,
context,
rootValue,
document,
operation,
}),
};
}
}
})();
return {
...result,
context,
rootValue,
document,
operation,
};
};