Develop Reference

React data router - pass context to loader

I have a JWT-based API. It rotates the tokens on every response. I have a custom provider that manages this.
I'm trying to figure out how I would use React Router v6.4 data router with this setup. Specifically, I'd like to use the loader / action functions for getting the data, but those don't support useContext and I'm not sure how to pass that in.
I'd like dashboardLoader to call the API with the current set of tokens as headers that AuthContext is managing for me.
The goal is to have the loader function fetch some data to display on the dashboard and to use the get() call from the AuthProvider.
My current alternative is to just do it inside the Dashboard component but would like to see how to do this with a loader.
The relevant files:
// App.js
import "./App.css";
import { createBrowserRouter } from "react-router-dom";
import "./App.css";
import Dashboard, { loader as dashboardLoader } from "./dashboard";
import AuthProvider from "./AuthProvider";
import axios from "axios";
function newApiClient() {
return axios.create({
baseURL: "http://localhost:3000",
headers: {
"Content-Type": "application/json",
},
});
}
const api = newApiClient();
export const router = createBrowserRouter([
{
path: "/",
element: (<h1>Welcome</h1>),
},
{
path: "/dashboard",
element: (
<AuthProvider apiClient={api}>
<Dashboard />
</AuthProvider>
),
loader: dashboardLoader,
},
]);
// AuthProvider
import { createContext, useState } from "react";
const AuthContext = createContext({
login: (email, password) => {},
isLoggedIn: () => {},
get: async () => {},
post: async () => {},
});
export function AuthProvider(props) {
const [authData, setAuthData] = useState({
client: props.apiClient,
accessToken: "",
});
async function login(email, password, callback) {
try {
const reqData = { email: email, password: password };
await post("/auth/sign_in", reqData);
callback();
} catch (e) {
console.error(e);
throw e;
}
}
function isLoggedIn() {
return authData.accessToken === "";
}
async function updateTokens(headers) {
setAuthData((prev) => {
return {
...prev,
accessToken: headers["access-token"],
};
});
}
async function get(path) {
try {
const response = await authData.client.get(path, {
headers: { "access-token": authData.accessToken },
});
await updateTokens(response.headers);
return response;
} catch (error) {
console.error(error);
throw error;
}
}
async function post(path, data) {
try {
const response = await authData.client.post(path, data, {
headers: { "access-token": authData.accessToken },
});
await updateTokens(response.headers);
return response.data;
} catch (error) {
// TODO
console.error(error);
throw error;
}
}
const context = {
login: login,
isLoggedIn: isLoggedIn,
get: get,
post: post,
};
return (
<AuthContext.Provider value={context}>
{props.children}
</AuthContext.Provider>
);
}
// Dashboard
import { useContext } from "react";
import { Navigate } from "react-router-dom";
import AuthContext from "./AuthProvider";
export function loader() {
// TODO use auth context to call the API
// For example:
// const response = await auth.get("/my-data");
// return response.data;
}
export default function Dashboard() {
const auth = useContext(AuthContext);
if (!auth.isLoggedIn()) {
return <Navigate to="/" replace />;
}
return <h1>Dashboard Stuff</h1>;
}

Create the axios instance as you are, but you'll tweak the AuthProvider to add request and response interceptors to handle the token and header. You'll pass a reference to the apiClient to the dashboardLoader loader function as well.
AuthProvider
Store the access token in a React ref and directly consume/reference the passed apiClient instead of storing it in local component state (a React anti-pattern). Add a useEffect hook to add the request and response interceptors to maintain the accessTokenRef value.
export function AuthProvider({ apiClient }) {
const accessTokenRef = useRef();
useEffect(() => {
const requestInterceptor = apiClient.interceptors.request.use(
(config) => {
// Attach current access token ref value to outgoing request headers
config.headers["access-token"] = accessTokenRef.current;
return config;
},
);
const responseInterceptor = apiClient.interceptors.response.use(
(response) => {
// Cache new token from incoming response headers
accessTokenRef.current = response.headers["access-token"];
return response;
},
);
// Return cleanup function to remove interceptors if apiClient updates
return () => {
apiClient.interceptors.request.eject(requestInterceptor);
apiClient.interceptors.response.eject(responseInterceptor);
};
}, [apiClient]);
async function login(email, password, callback) {
try {
const reqData = { email, password };
await apiClient.post("/auth/sign_in", reqData);
callback();
} catch (e) {
console.error(e);
throw e;
}
}
function isLoggedIn() {
return accessTokenRef.current === "";
}
const context = {
login,
isLoggedIn,
get: apiClient.get,
post: apiClient.post,
};
return (
<AuthContext.Provider value={context}>
{props.children}
</AuthContext.Provider>
);
}
Dashboard
Note here that loader is a curried function, e.g. a function that consumes a single argument and returns another function. This is to consume and close over in callback scope the instance of the apiClient.
export const loader = (apiClient) => ({ params, request }) {
// Use passed apiClient to call the API
// For example:
// const response = await apiClient.get("/my-data");
// return response.data;
}
App.js
import { createBrowserRouter } from "react-router-dom";
import axios from "axios";
import "./App.css";
import Dashboard, { loader as dashboardLoader } from "./dashboard";
import AuthProvider from "./AuthProvider";
function newApiClient() {
return axios.create({
baseURL: "http://localhost:3000",
headers: {
"Content-Type": "application/json",
},
});
}
const apiClient = newApiClient();
export const router = createBrowserRouter([
{
path: "/",
element: (<h1>Welcome</h1>),
},
{
path: "/dashboard",
element: (
<AuthProvider apiClient={apiClient}> // <-- pass apiClient
<Dashboard />
</AuthProvider>
),
loader: dashboardLoader(apiClient), // <-- pass apiClient
},
]);

How to refresh a token asynchronously using Apollo

I use postMessage to get the token from the mobile client. Js client sends request using requestRefresh function with postMessage to receive JWT token. Mobile clients execute JS code using a method call, which is described inside the WebView. I save the token in a cookie when I receive it in webview. I successfully get a token the first time I render a component, but I have a problem with updating the token asynchronously in the Apollo client when an "Unauthenticated" or "Invalid jwt token" error occurs.
I don't understand how I can call the call and response function from the mobile client asynchronously inside the onError handler and save the token.
I've reviewed several resources on this, StackOverflow answers 1, 2, Github examples 3, 4, and this blog post 5, but didn't find similar case
.
index.tsx
import React, { Suspense, useState, useEffect, useCallback, useMemo } from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter } from 'react-router-dom';
import { ApolloClient, InMemoryCache, createHttpLink, ApolloProvider, from } from '#apollo/client';
import { setContext } from '#apollo/client/link/context';
import { onError } from '#apollo/client/link/error';
import { App } from 'app';
import Cookies from 'universal-cookie';
const cookies = new Cookies();
const httpLink = createHttpLink({
uri: process.env.API_HOST,
});
const authLink = setContext((_, { headers }) => {
const token = cookies.get('token');
return {
headers: {
...headers,
authorization: token ? `Bearer ${token}` : '',
},
};
});
const errorLink = onError(({ graphQLErrors, operation, forward }) => {
if (graphQLErrors)
for (const err of graphQLErrors) {
switch (err?.extensions?.code) {
case 'UNAUTHENTICATED':
// error code is set to UNAUTHENTICATED
//How to call and process a response from a mobile client here?
const oldHeaders = operation.getContext().headers;
operation.setContext({
headers: {
...oldHeaders,
authorization: token ? `Bearer ${token}` : '',
},
});
// retry the request, returning the new observable
return forward(operation);
}
}
});
const client = new ApolloClient({
cache: new InMemoryCache({
typePolicies: {
User: {
keyFields: ['userId'],
},
},
}),
link: from([errorLink, authLink, httpLink]),
uri: process.env.API_HOST,
connectToDevTools: process.env.NODE_ENV === 'development',
});
import React, { useEffect, useState, useCallback, useMemo } from 'react';
import Cookies from 'universal-cookie';
interface IMessage {
action: string;
data?: {
text: string;
old_jwt?: string;
};
}
enum Actions {
refreshJWT = 'refresh_jwt',
}
interface IMessageEventData {
action: Actions;
success: boolean;
payload: {
data: string;
};
}
export const Index: React.FC = () => {
const cookies = new Cookies();
const token = cookies.get('token');
const message = useMemo((): IMessage => {
return {
action: Actions.refreshJWT,
data: {
text: 'Hello from JS',
...(token && { old_jwt: token }),
},
};
}, [token]);
const requestRefresh = useCallback(() => {
if (typeof Android !== 'undefined') {
Android.postMessage(JSON.stringify(message));
} else {
window?.webkit?.messageHandlers.iosHandler.postMessage(message);
}
}, [message]);
// #ts-ignore
window.callWebView = useCallback(
({ success, payload, action }: IMessageEventData) => {
if (success) {
if (action === Actions.refreshJWT) {
cookies.set('token', payload.data, { path: '/' });
}
} else {
throw new Error(payload.data);
}
},
[requestRefresh]
);
useEffect(() => {
requestRefresh();
}, []);
return (
<BrowserRouter>
<ApolloProvider client={client}>
<App />
</ApolloProvider>
</BrowserRouter>
);
};
ReactDOM.render(<Index />, document.getElementById('root'));

how to make useEffect without initial render

I just started learning javascript and react-redux, and I'm using useEffect to call POST method. So, I am wondering how to make it not send request to my backend whenever I open or refresh website
my HTTP Post looks like:
export const sendItemData = (items) => {
return async () => {
const sendRequest = async () => {
const response = await fetch("http://localhost:51044/api/Items", {
method: "POST",
body: JSON.stringify(items.Items),
headers: {
"Content-Type": "application/json",
Accept: "application/json",
},
credentials: "same-origin",
});
if (!response.ok) {
throw new Error("Sending data failed!");
}
};
try {
await sendRequest();
} catch (error) {
console.log(error);
}
};
};
and my App.js looks like:
import React from "react";
import { useEffect } from "react";
import { useDispatch, useSelector } from "react-redux";
import Items from "./components/Items ";
import { sendItemData } from "./store/items-actions";
function App() {
const dispatch = useDispatch();
const sendItems = useSelector((state) => state.items);
useEffect(() => {
dispatch(sendItemData(sendItems));
}, [sendItems, dispatch]);
return <Items />;
}
export default App;

Ok, this is my way, tray it
export function MyComp(props) {
const initial = useRef(true)
useEffect(() => {
if (!initial.current) {
// Yoyr code
} else {
// Mark for next times
initial.current = false;
}
}, [args]);
return (
<YourContent />
);
}

ApolloProvider useQuery combination does not fetch data from AWS AppSync, in React project

Situation
Due to the compatible issue, I am using ApolloClient to form my AWS AppSync API client, so that I can use ApolloProvider to pass the client to different sub-component.
In the sub-component, I call useQuery to fetch data, but the problem is the output always give me default "undefined" value.
Code in Top Level
import awsconfig from '../aws-exports';
import { AUTH_TYPE } from 'aws-appsync';
import {
ApolloProvider,
ApolloClient,
ApolloLink,
HttpLink,
InMemoryCache,
} from "#apollo/client";
import { createAuthLink } from "aws-appsync-auth-link";
import { getUserDb, listUserDbs } from '../graphql/queries';
const link = ApolloLink.from([
createAuthLink({
url: awsconfig.aws_appsync_graphqlEndpoint,
region: awsconfig.aws_appsync_region,
auth: {
type: AUTH_TYPE.API_KEY,
apiKey: awsconfig.aws_appsync_apiKey,
},
}),
new HttpLink({ uri: awsconfig.aws_appsync_graphqlEndpoint }),
]);
const client = new ApolloClient({
link,
cache: new InMemoryCache(),
credentials: 'include'
});
function WithProvider (){
return (
<ApolloProvider client={client}>
<App />
</ApolloProvider>
)
}
export default WithProvider;
Code in sub-Component (usage of useQuery)
import { listUserDbs } from '../graphql/queries';
const GET_USER_PROFILE = gql(listUserDbs)
function App() {
const { loading, error, out_data, client } = useQuery(GET_USER_PROFILE);
if (loading) return <p>Loading...</p>;
if (error) return <p>Error :(</p>;
What test have I done?
when I call query straight from client, it worked
client
.query({
query: gql`
query ListUserDbs(
$filter: Table
) {
listUserDBS(filter: $filter) {
items {
sub
}
nextToken
}
}
`
})
.then(result => console.log(result));
when I ask useQuery to return client, it returns the same client I set up
const { loading, error, out_data, client } = useQuery(LIST_USER_PROFILE);
My guess of the issue
The issue is probably coming from useQuery but I don't know how to solve it.

Maybe you need data instead of out_data?

Redux thunk not returning function when using Apollo client

I'm using redux-thunk for async actions, and all was working as expected until I added an Apollo Client into the mix, and I can't figure out why. The action is being dispatched, but the return function is not being called.
-- Client provider so that I can use the client in the Redux store outside of the components wrapped in <ApolloProvider>.
import { ApolloClient, InMemoryCache, createHttpLink } from "#apollo/client";
class ApolloClientProvider {
constructor() {
this.client = new ApolloClient({
link: createHttpLink({ uri: process.env.gqlEndpoint }),
cache: new InMemoryCache(),
});
}
}
export default new ApolloClientProvider();
-- My store setup
const client = ApolloClientProvider.client;
const persistConfig = {
key: "root",
storage: storage,
};
const pReducer = persistReducer(persistConfig, rootReducer);
const store = createStore(
pReducer,
applyMiddleware(thunk.withExtraArgument(client))
);
-- The action
export const fetchMakeCache = (token) => (dispatch, client) => {
console.log("fetching");
const query = gql`
query Source {
sources {
UID
Name
ActiveRevDestination
}
workspaces {
UID
Name
SourceUids
ActiveRevSource
}
}
`;
return () => {
console.log("reached return");
dispatch(requestMakeCache());
client
.query({
query: query,
context: {
headers: {
Authorization: `Bearer ${token}`,
},
},
})
.then((r) => r.json())
.then((data) => dispatch(receivedMakeCache(data)))
.catch((error) => dispatch(failedMakeCache(error)));
};
};
-- The component dispatching the thunk
import React from "react";
import { useAuth0 } from "#auth0/auth0-react";
import { useDispatch } from "react-redux";
import * as actions from "../store/actions";
const Fetch = () => {
const dispatch = useDispatch();
const { getAccessTokenSilently, isAuthenticated } = useAuth0();
if (isAuthenticated) {
// This will set loading = false immediately
// The async function below results in loading not being set to false
// until other components are performing actions that will error
dispatch(actions.requestMakeCache());
(async () => {
const token = await getAccessTokenSilently({
audience: process.env.audience,
});
dispatch(actions.fetchMakeCache(await token));
})();
}
return <></>;
};
export default Fetch;
When the Fetch component loads, the "fetching" console log prints so it's definitely being dispatched. But the "reached return" never gets hit. This exact same code worked as expected when not using the Apollo client. However, I've been able to use the same client successfully in a component. I'm not getting any errors, the return function just isn't being hit.
Most of the questions on here about thunks not running the return function have to do with not dispatching correctly, but I don't think that's the case since this worked pre-Apollo. (Yes, I know that using redux and Apollo together isn't ideal, but this is what I have to do right now)