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ReactFlightReplyClient.js
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ReactFlightReplyClient.js
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type {
Thenable,
PendingThenable,
FulfilledThenable,
RejectedThenable,
ReactCustomFormAction,
} from 'shared/ReactTypes';
import type {LazyComponent} from 'react/src/ReactLazy';
import type {TemporaryReferenceSet} from './ReactFlightTemporaryReferences';
import {enableRenderableContext} from 'shared/ReactFeatureFlags';
import {
REACT_ELEMENT_TYPE,
REACT_LAZY_TYPE,
REACT_CONTEXT_TYPE,
REACT_PROVIDER_TYPE,
getIteratorFn,
} from 'shared/ReactSymbols';
import {
describeObjectForErrorMessage,
isSimpleObject,
objectName,
} from 'shared/ReactSerializationErrors';
import {writeTemporaryReference} from './ReactFlightTemporaryReferences';
import isArray from 'shared/isArray';
import getPrototypeOf from 'shared/getPrototypeOf';
const ObjectPrototype = Object.prototype;
import {usedWithSSR} from './ReactFlightClientConfig';
type ReactJSONValue =
| string
| boolean
| number
| null
| $ReadOnlyArray<ReactJSONValue>
| ReactServerObject;
export opaque type ServerReference<T> = T;
export type CallServerCallback = <A, T>(id: any, args: A) => Promise<T>;
export type EncodeFormActionCallback = <A>(
id: any,
args: Promise<A>,
) => ReactCustomFormAction;
export type ServerReferenceId = any;
const knownServerReferences: WeakMap<
Function,
{id: ServerReferenceId, bound: null | Thenable<Array<any>>},
> = new WeakMap();
// Serializable values
export type ReactServerValue =
// References are passed by their value
| ServerReference<any>
// The rest are passed as is. Sub-types can be passed in but lose their
// subtype, so the receiver can only accept once of these.
| string
| boolean
| number
| null
| void
| bigint
| Iterable<ReactServerValue>
| Array<ReactServerValue>
| Map<ReactServerValue, ReactServerValue>
| Set<ReactServerValue>
| FormData
| Date
| ReactServerObject
| Promise<ReactServerValue>; // Thenable<ReactServerValue>
type ReactServerObject = {+[key: string]: ReactServerValue};
function serializeByValueID(id: number): string {
return '$' + id.toString(16);
}
function serializePromiseID(id: number): string {
return '$@' + id.toString(16);
}
function serializeServerReferenceID(id: number): string {
return '$F' + id.toString(16);
}
function serializeTemporaryReferenceID(id: number): string {
return '$T' + id.toString(16);
}
function serializeFormDataReference(id: number): string {
// Why K? F is "Function". D is "Date". What else?
return '$K' + id.toString(16);
}
function serializeNumber(number: number): string | number {
if (Number.isFinite(number)) {
if (number === 0 && 1 / number === -Infinity) {
return '$-0';
} else {
return number;
}
} else {
if (number === Infinity) {
return '$Infinity';
} else if (number === -Infinity) {
return '$-Infinity';
} else {
return '$NaN';
}
}
}
function serializeUndefined(): string {
return '$undefined';
}
function serializeDateFromDateJSON(dateJSON: string): string {
// JSON.stringify automatically calls Date.prototype.toJSON which calls toISOString.
// We need only tack on a $D prefix.
return '$D' + dateJSON;
}
function serializeBigInt(n: bigint): string {
return '$n' + n.toString(10);
}
function serializeMapID(id: number): string {
return '$Q' + id.toString(16);
}
function serializeSetID(id: number): string {
return '$W' + id.toString(16);
}
function escapeStringValue(value: string): string {
if (value[0] === '$') {
// We need to escape $ prefixed strings since we use those to encode
// references to IDs and as special symbol values.
return '$' + value;
} else {
return value;
}
}
export function processReply(
root: ReactServerValue,
formFieldPrefix: string,
temporaryReferences: void | TemporaryReferenceSet,
resolve: (string | FormData) => void,
reject: (error: mixed) => void,
): void {
let nextPartId = 1;
let pendingParts = 0;
let formData: null | FormData = null;
function resolveToJSON(
this:
| {+[key: string | number]: ReactServerValue}
| $ReadOnlyArray<ReactServerValue>,
key: string,
value: ReactServerValue,
): ReactJSONValue {
const parent = this;
// Make sure that `parent[key]` wasn't JSONified before `value` was passed to us
if (__DEV__) {
// $FlowFixMe[incompatible-use]
const originalValue = parent[key];
if (
typeof originalValue === 'object' &&
originalValue !== value &&
!(originalValue instanceof Date)
) {
if (objectName(originalValue) !== 'Object') {
console.error(
'Only plain objects can be passed to Server Functions from the Client. ' +
'%s objects are not supported.%s',
objectName(originalValue),
describeObjectForErrorMessage(parent, key),
);
} else {
console.error(
'Only plain objects can be passed to Server Functions from the Client. ' +
'Objects with toJSON methods are not supported. Convert it manually ' +
'to a simple value before passing it to props.%s',
describeObjectForErrorMessage(parent, key),
);
}
}
}
if (value === null) {
return null;
}
if (typeof value === 'object') {
switch ((value: any).$$typeof) {
case REACT_ELEMENT_TYPE: {
if (temporaryReferences === undefined) {
throw new Error(
'React Element cannot be passed to Server Functions from the Client without a ' +
'temporary reference set. Pass a TemporaryReferenceSet to the options.' +
(__DEV__ ? describeObjectForErrorMessage(parent, key) : ''),
);
}
return serializeTemporaryReferenceID(
writeTemporaryReference(temporaryReferences, value),
);
}
case REACT_LAZY_TYPE: {
// Resolve lazy as if it wasn't here. In the future this will be encoded as a Promise.
const lazy: LazyComponent<any, any> = (value: any);
const payload = lazy._payload;
const init = lazy._init;
if (formData === null) {
// Upgrade to use FormData to allow us to stream this value.
formData = new FormData();
}
pendingParts++;
try {
const resolvedModel = init(payload);
// We always outline this as a separate part even though we could inline it
// because it ensures a more deterministic encoding.
const lazyId = nextPartId++;
const partJSON = JSON.stringify(resolvedModel, resolveToJSON);
// $FlowFixMe[incompatible-type] We know it's not null because we assigned it above.
const data: FormData = formData;
// eslint-disable-next-line react-internal/safe-string-coercion
data.append(formFieldPrefix + lazyId, partJSON);
return serializeByValueID(lazyId);
} catch (x) {
if (
typeof x === 'object' &&
x !== null &&
typeof x.then === 'function'
) {
// Suspended
pendingParts++;
const lazyId = nextPartId++;
const thenable: Thenable<any> = (x: any);
const retry = function () {
// While the first promise resolved, its value isn't necessarily what we'll
// resolve into because we might suspend again.
try {
const partJSON = JSON.stringify(value, resolveToJSON);
// $FlowFixMe[incompatible-type] We know it's not null because we assigned it above.
const data: FormData = formData;
// eslint-disable-next-line react-internal/safe-string-coercion
data.append(formFieldPrefix + lazyId, partJSON);
pendingParts--;
if (pendingParts === 0) {
resolve(data);
}
} catch (reason) {
reject(reason);
}
};
thenable.then(retry, retry);
return serializeByValueID(lazyId);
} else {
// In the future we could consider serializing this as an error
// that throws on the server instead.
reject(x);
return null;
}
} finally {
pendingParts--;
}
}
}
// $FlowFixMe[method-unbinding]
if (typeof value.then === 'function') {
// We assume that any object with a .then property is a "Thenable" type,
// or a Promise type. Either of which can be represented by a Promise.
if (formData === null) {
// Upgrade to use FormData to allow us to stream this value.
formData = new FormData();
}
pendingParts++;
const promiseId = nextPartId++;
const thenable: Thenable<any> = (value: any);
thenable.then(
partValue => {
try {
const partJSON = JSON.stringify(partValue, resolveToJSON);
// $FlowFixMe[incompatible-type] We know it's not null because we assigned it above.
const data: FormData = formData;
// eslint-disable-next-line react-internal/safe-string-coercion
data.append(formFieldPrefix + promiseId, partJSON);
pendingParts--;
if (pendingParts === 0) {
resolve(data);
}
} catch (reason) {
reject(reason);
}
},
reason => {
// In the future we could consider serializing this as an error
// that throws on the server instead.
reject(reason);
},
);
return serializePromiseID(promiseId);
}
if (isArray(value)) {
// $FlowFixMe[incompatible-return]
return value;
}
// TODO: Should we the Object.prototype.toString.call() to test for cross-realm objects?
if (value instanceof FormData) {
if (formData === null) {
// Upgrade to use FormData to allow us to use rich objects as its values.
formData = new FormData();
}
const data: FormData = formData;
const refId = nextPartId++;
// Copy all the form fields with a prefix for this reference.
// These must come first in the form order because we assume that all the
// fields are available before this is referenced.
const prefix = formFieldPrefix + refId + '_';
// $FlowFixMe[prop-missing]: FormData has forEach.
value.forEach((originalValue: string | File, originalKey: string) => {
data.append(prefix + originalKey, originalValue);
});
return serializeFormDataReference(refId);
}
if (value instanceof Map) {
const partJSON = JSON.stringify(Array.from(value), resolveToJSON);
if (formData === null) {
formData = new FormData();
}
const mapId = nextPartId++;
formData.append(formFieldPrefix + mapId, partJSON);
return serializeMapID(mapId);
}
if (value instanceof Set) {
const partJSON = JSON.stringify(Array.from(value), resolveToJSON);
if (formData === null) {
formData = new FormData();
}
const setId = nextPartId++;
formData.append(formFieldPrefix + setId, partJSON);
return serializeSetID(setId);
}
const iteratorFn = getIteratorFn(value);
if (iteratorFn) {
return Array.from((value: any));
}
// Verify that this is a simple plain object.
const proto = getPrototypeOf(value);
if (
proto !== ObjectPrototype &&
(proto === null || getPrototypeOf(proto) !== null)
) {
if (temporaryReferences === undefined) {
throw new Error(
'Only plain objects, and a few built-ins, can be passed to Server Actions. ' +
'Classes or null prototypes are not supported.',
);
}
// We can serialize class instances as temporary references.
return serializeTemporaryReferenceID(
writeTemporaryReference(temporaryReferences, value),
);
}
if (__DEV__) {
if (
(value: any).$$typeof ===
(enableRenderableContext ? REACT_CONTEXT_TYPE : REACT_PROVIDER_TYPE)
) {
console.error(
'React Context Providers cannot be passed to Server Functions from the Client.%s',
describeObjectForErrorMessage(parent, key),
);
} else if (objectName(value) !== 'Object') {
console.error(
'Only plain objects can be passed to Server Functions from the Client. ' +
'%s objects are not supported.%s',
objectName(value),
describeObjectForErrorMessage(parent, key),
);
} else if (!isSimpleObject(value)) {
console.error(
'Only plain objects can be passed to Server Functions from the Client. ' +
'Classes or other objects with methods are not supported.%s',
describeObjectForErrorMessage(parent, key),
);
} else if (Object.getOwnPropertySymbols) {
const symbols = Object.getOwnPropertySymbols(value);
if (symbols.length > 0) {
console.error(
'Only plain objects can be passed to Server Functions from the Client. ' +
'Objects with symbol properties like %s are not supported.%s',
symbols[0].description,
describeObjectForErrorMessage(parent, key),
);
}
}
}
// $FlowFixMe[incompatible-return]
return value;
}
if (typeof value === 'string') {
// TODO: Maybe too clever. If we support URL there's no similar trick.
if (value[value.length - 1] === 'Z') {
// Possibly a Date, whose toJSON automatically calls toISOString
// $FlowFixMe[incompatible-use]
const originalValue = parent[key];
if (originalValue instanceof Date) {
return serializeDateFromDateJSON(value);
}
}
return escapeStringValue(value);
}
if (typeof value === 'boolean') {
return value;
}
if (typeof value === 'number') {
return serializeNumber(value);
}
if (typeof value === 'undefined') {
return serializeUndefined();
}
if (typeof value === 'function') {
const metaData = knownServerReferences.get(value);
if (metaData !== undefined) {
const metaDataJSON = JSON.stringify(metaData, resolveToJSON);
if (formData === null) {
// Upgrade to use FormData to allow us to stream this value.
formData = new FormData();
}
// The reference to this function came from the same client so we can pass it back.
const refId = nextPartId++;
// eslint-disable-next-line react-internal/safe-string-coercion
formData.set(formFieldPrefix + refId, metaDataJSON);
return serializeServerReferenceID(refId);
}
if (temporaryReferences === undefined) {
throw new Error(
'Client Functions cannot be passed directly to Server Functions. ' +
'Only Functions passed from the Server can be passed back again.',
);
}
return serializeTemporaryReferenceID(
writeTemporaryReference(temporaryReferences, value),
);
}
if (typeof value === 'symbol') {
if (temporaryReferences === undefined) {
throw new Error(
'Symbols cannot be passed to a Server Function without a ' +
'temporary reference set. Pass a TemporaryReferenceSet to the options.' +
(__DEV__ ? describeObjectForErrorMessage(parent, key) : ''),
);
}
return serializeTemporaryReferenceID(
writeTemporaryReference(temporaryReferences, value),
);
}
if (typeof value === 'bigint') {
return serializeBigInt(value);
}
throw new Error(
`Type ${typeof value} is not supported as an argument to a Server Function.`,
);
}
// $FlowFixMe[incompatible-type] it's not going to be undefined because we'll encode it.
const json: string = JSON.stringify(root, resolveToJSON);
if (formData === null) {
// If it's a simple data structure, we just use plain JSON.
resolve(json);
} else {
// Otherwise, we use FormData to let us stream in the result.
formData.set(formFieldPrefix + '0', json);
if (pendingParts === 0) {
// $FlowFixMe[incompatible-call] this has already been refined.
resolve(formData);
}
}
}
const boundCache: WeakMap<
{id: ServerReferenceId, bound: null | Thenable<Array<any>>},
Thenable<FormData>,
> = new WeakMap();
function encodeFormData(reference: any): Thenable<FormData> {
let resolve, reject;
// We need to have a handle on the thenable so that we can synchronously set
// its status from processReply, when it can complete synchronously.
const thenable: Thenable<FormData> = new Promise((res, rej) => {
resolve = res;
reject = rej;
});
processReply(
reference,
'',
undefined, // TODO: This means React Elements can't be used as state in progressive enhancement.
(body: string | FormData) => {
if (typeof body === 'string') {
const data = new FormData();
data.append('0', body);
body = data;
}
const fulfilled: FulfilledThenable<FormData> = (thenable: any);
fulfilled.status = 'fulfilled';
fulfilled.value = body;
resolve(body);
},
e => {
const rejected: RejectedThenable<FormData> = (thenable: any);
rejected.status = 'rejected';
rejected.reason = e;
reject(e);
},
);
return thenable;
}
function defaultEncodeFormAction(
this: any => Promise<any>,
identifierPrefix: string,
): ReactCustomFormAction {
const reference = knownServerReferences.get(this);
if (!reference) {
throw new Error(
'Tried to encode a Server Action from a different instance than the encoder is from. ' +
'This is a bug in React.',
);
}
let data: null | FormData = null;
let name;
const boundPromise = reference.bound;
if (boundPromise !== null) {
let thenable = boundCache.get(reference);
if (!thenable) {
thenable = encodeFormData(reference);
boundCache.set(reference, thenable);
}
if (thenable.status === 'rejected') {
throw thenable.reason;
} else if (thenable.status !== 'fulfilled') {
throw thenable;
}
const encodedFormData = thenable.value;
// This is hacky but we need the identifier prefix to be added to
// all fields but the suspense cache would break since we might get
// a new identifier each time. So we just append it at the end instead.
const prefixedData = new FormData();
// $FlowFixMe[prop-missing]
encodedFormData.forEach((value: string | File, key: string) => {
prefixedData.append('$ACTION_' + identifierPrefix + ':' + key, value);
});
data = prefixedData;
// We encode the name of the prefix containing the data.
name = '$ACTION_REF_' + identifierPrefix;
} else {
// This is the simple case so we can just encode the ID.
name = '$ACTION_ID_' + reference.id;
}
return {
name: name,
method: 'POST',
encType: 'multipart/form-data',
data: data,
};
}
function customEncodeFormAction(
proxy: any => Promise<any>,
identifierPrefix: string,
encodeFormAction: EncodeFormActionCallback,
): ReactCustomFormAction {
const reference = knownServerReferences.get(proxy);
if (!reference) {
throw new Error(
'Tried to encode a Server Action from a different instance than the encoder is from. ' +
'This is a bug in React.',
);
}
let boundPromise: Promise<Array<any>> = (reference.bound: any);
if (boundPromise === null) {
boundPromise = Promise.resolve([]);
}
return encodeFormAction(reference.id, boundPromise);
}
function isSignatureEqual(
this: any => Promise<any>,
referenceId: ServerReferenceId,
numberOfBoundArgs: number,
): boolean {
const reference = knownServerReferences.get(this);
if (!reference) {
throw new Error(
'Tried to encode a Server Action from a different instance than the encoder is from. ' +
'This is a bug in React.',
);
}
if (reference.id !== referenceId) {
// These are different functions.
return false;
}
// Now check if the number of bound arguments is the same.
const boundPromise = reference.bound;
if (boundPromise === null) {
// No bound arguments.
return numberOfBoundArgs === 0;
}
// Unwrap the bound arguments array by suspending, if necessary. As with
// encodeFormData, this means isSignatureEqual can only be called while React
// is rendering.
switch (boundPromise.status) {
case 'fulfilled': {
const boundArgs = boundPromise.value;
return boundArgs.length === numberOfBoundArgs;
}
case 'pending': {
throw boundPromise;
}
case 'rejected': {
throw boundPromise.reason;
}
default: {
if (typeof boundPromise.status === 'string') {
// Only instrument the thenable if the status if not defined.
} else {
const pendingThenable: PendingThenable<Array<any>> =
(boundPromise: any);
pendingThenable.status = 'pending';
pendingThenable.then(
(boundArgs: Array<any>) => {
const fulfilledThenable: FulfilledThenable<Array<any>> =
(boundPromise: any);
fulfilledThenable.status = 'fulfilled';
fulfilledThenable.value = boundArgs;
},
(error: mixed) => {
const rejectedThenable: RejectedThenable<number> =
(boundPromise: any);
rejectedThenable.status = 'rejected';
rejectedThenable.reason = error;
},
);
}
throw boundPromise;
}
}
}
export function registerServerReference(
proxy: any,
reference: {id: ServerReferenceId, bound: null | Thenable<Array<any>>},
encodeFormAction: void | EncodeFormActionCallback,
) {
// Expose encoder for use by SSR, as well as a special bind that can be used to
// keep server capabilities.
if (usedWithSSR) {
// Only expose this in builds that would actually use it. Not needed on the client.
const $$FORM_ACTION =
encodeFormAction === undefined
? defaultEncodeFormAction
: function (
this: any => Promise<any>,
identifierPrefix: string,
): ReactCustomFormAction {
return customEncodeFormAction(
this,
identifierPrefix,
encodeFormAction,
);
};
Object.defineProperties((proxy: any), {
$$FORM_ACTION: {value: $$FORM_ACTION},
$$IS_SIGNATURE_EQUAL: {value: isSignatureEqual},
bind: {value: bind},
});
}
knownServerReferences.set(proxy, reference);
}
// $FlowFixMe[method-unbinding]
const FunctionBind = Function.prototype.bind;
// $FlowFixMe[method-unbinding]
const ArraySlice = Array.prototype.slice;
function bind(this: Function): Function {
// $FlowFixMe[unsupported-syntax]
const newFn = FunctionBind.apply(this, arguments);
const reference = knownServerReferences.get(this);
if (reference) {
if (__DEV__) {
const thisBind = arguments[0];
if (thisBind != null) {
// This doesn't warn in browser environments since it's not instrumented outside
// usedWithSSR. This makes this an SSR only warning which we don't generally do.
// TODO: Consider a DEV only instrumentation in the browser.
console.error(
'Cannot bind "this" of a Server Action. Pass null or undefined as the first argument to .bind().',
);
}
}
const args = ArraySlice.call(arguments, 1);
let boundPromise = null;
if (reference.bound !== null) {
boundPromise = Promise.resolve((reference.bound: any)).then(boundArgs =>
boundArgs.concat(args),
);
} else {
boundPromise = Promise.resolve(args);
}
// Expose encoder for use by SSR, as well as a special bind that can be used to
// keep server capabilities.
if (usedWithSSR) {
// Only expose this in builds that would actually use it. Not needed on the client.
Object.defineProperties((newFn: any), {
$$FORM_ACTION: {value: this.$$FORM_ACTION},
$$IS_SIGNATURE_EQUAL: {value: isSignatureEqual},
bind: {value: bind},
});
}
knownServerReferences.set(newFn, {id: reference.id, bound: boundPromise});
}
return newFn;
}
export function createServerReference<A: Iterable<any>, T>(
id: ServerReferenceId,
callServer: CallServerCallback,
encodeFormAction?: EncodeFormActionCallback,
): (...A) => Promise<T> {
const proxy = function (): Promise<T> {
// $FlowFixMe[method-unbinding]
const args = Array.prototype.slice.call(arguments);
return callServer(id, args);
};
registerServerReference(proxy, {id, bound: null}, encodeFormAction);
return proxy;
}