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selectHttpOptionsAndBody.ts
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selectHttpOptionsAndBody.ts
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import { print } from 'graphql';
import { Operation } from '../core';
export interface UriFunction {
(operation: Operation): string;
}
export interface Body {
query?: string;
operationName?: string;
variables?: Record<string, any>;
extensions?: Record<string, any>;
}
export interface HttpOptions {
/**
* The URI to use when fetching operations.
*
* Defaults to '/graphql'.
*/
uri?: string | UriFunction;
/**
* Passes the extensions field to your graphql server.
*
* Defaults to false.
*/
includeExtensions?: boolean;
/**
* A `fetch`-compatible API to use when making requests.
*/
fetch?: WindowOrWorkerGlobalScope['fetch'];
/**
* An object representing values to be sent as headers on the request.
*/
headers?: any;
/**
* The credentials policy you want to use for the fetch call.
*/
credentials?: string;
/**
* Any overrides of the fetch options argument to pass to the fetch call.
*/
fetchOptions?: any;
/**
* If set to true, use the HTTP GET method for query operations. Mutations
* will still use the method specified in fetchOptions.method (which defaults
* to POST).
*/
useGETForQueries?: boolean;
/**
* If set to true, the default behavior of stripping unused variables
* from the request will be disabled.
*
* Unused variables are likely to trigger server-side validation errors,
* per https://spec.graphql.org/draft/#sec-All-Variables-Used, but this
* includeUnusedVariables option can be useful if your server deviates
* from the GraphQL specification by not strictly enforcing that rule.
*/
includeUnusedVariables?: boolean;
}
export interface HttpQueryOptions {
includeQuery?: boolean;
includeExtensions?: boolean;
}
export interface HttpConfig {
http?: HttpQueryOptions;
options?: any;
headers?: any;
credentials?: any;
}
const defaultHttpOptions: HttpQueryOptions = {
includeQuery: true,
includeExtensions: false,
};
const defaultHeaders = {
// headers are case insensitive (https://stackoverflow.com/a/5259004)
accept: '*/*',
'content-type': 'application/json',
};
const defaultOptions = {
method: 'POST',
};
export const fallbackHttpConfig = {
http: defaultHttpOptions,
headers: defaultHeaders,
options: defaultOptions,
};
export const selectHttpOptionsAndBody = (
operation: Operation,
fallbackConfig: HttpConfig,
...configs: Array<HttpConfig>
) => {
let options: HttpConfig & Record<string, any> = {
...fallbackConfig.options,
headers: fallbackConfig.headers,
credentials: fallbackConfig.credentials,
};
let http: HttpQueryOptions = fallbackConfig.http || {};
/*
* use the rest of the configs to populate the options
* configs later in the list will overwrite earlier fields
*/
configs.forEach(config => {
options = {
...options,
...config.options,
headers: {
...options.headers,
...headersToLowerCase(config.headers),
},
};
if (config.credentials) options.credentials = config.credentials;
http = {
...http,
...config.http,
};
});
//The body depends on the http options
const { operationName, extensions, variables, query } = operation;
const body: Body = { operationName, variables };
if (http.includeExtensions) (body as any).extensions = extensions;
// not sending the query (i.e persisted queries)
if (http.includeQuery) (body as any).query = print(query);
return {
options,
body,
};
};
function headersToLowerCase(
headers: Record<string, string> | undefined
): typeof headers {
if (headers) {
const normalized = Object.create(null);
Object.keys(Object(headers)).forEach(name => {
normalized[name.toLowerCase()] = headers[name];
});
return normalized;
}
return headers;
}