We Keep Coding

Is it possible to access token in service-worker fetch request headers?

I want to send a GET request including a token "Authorization" header to my nodejs server. For this, I use this function client-side:
// Do a secured GET API request and return response object
async function getJSON(url) {
try {
// Send request
const res = await fetch(url, {
headers: { Authorization: localStorage.getItem('token') }
});
// If something went wrong
if (!res.ok) {
// If token is invalid
if (res.status === 401) {
// Logout
localStorage.removeItem('token');
location.replace(`/?msg=${dict.get('expired-session')}`);
}
// Return an object with error message and status code
return { error: res.statusText, status: res.status };
}
// Else return response object
else return await res.json();
} catch (err) {
// Return an object with error message
return { error: err.message };
}
}
It works fine, but I use a service worker to cache requests as they are made and I don't want API requests to be cached, so I though I could just check for the "Authorization"'s presence:
// Fetch event
self.addEventListener('fetch', e => e.respondWith(respond(e)));
async function fetchAndCache(req, cache_name) {
const { url, headers } = req;
console.log({ url, headers });
// Fetch request
const fetch_res = await fetch(req);
const is_get = req.method === 'GET';
const is_api = req.headers.Authorization;
const is_cahing_domain = cache_domains.some(domain => req.url.includes(domain));
if (is_cahing_domain && is_get && !is_api) {
// Open cache and save a cloned result
const cache = await caches.open(cache_name);
cache.put(req, fetch_res.clone());
}
return fetch_res;
}
async function respond(e) {
if (!use_cache) return fetch(e.request);
// Try to get response from cache
const cached_res = await caches.match(e.request);
// If response is found, return it
if (cached_res) return cached_res;
// If request is not found, try to fetch it
return await fetchAndCache(e.request, 'main');
}
Unfortunately, the logs show empty headers:
Even though the server does get the token and the cached (since the condition does not work) request also includes it:
I searched for a few hours, tried every solutions in similar questions (here and here) but none worked. Please help.

I don't know about Authorization header. But the right way to print headers is via method 2. It seems like you are using method 1.
console.log("Try 1 to print headers.");
console.log(request.headers);
console.log("Try 2 to print headers.")
for (const pair of event.request.headers.entries()) {
console.log(pair[0]+ ': '+ pair[1]);
}
Console logs

Headers {} does not mean that the header is empty. It means that it contains an object which is not printed in detail in your console.
You can access the Authorization header as follow:
console.log('AuthorizationHeader is:',headers.get('Authorization'))

How to do A/B testing with Cloudflare workers

I'm looking for an example of what these two lines of code look like in a functioning A/B testing worker. From https://developers.cloudflare.com/workers/examples/ab-testing
const TEST_RESPONSE = new Response("Test group") // e.g. await fetch("/test/sompath", request)
const CONTROL_RESPONSE = new Response("Control group") // e.g. await fetch("/control/sompath", request)
I used the examples, subsituting the paths I’m using, and got a syntax error saying await can only be used in async. So I changed the function to async function handleRequest(request) and got a 500 error.
What should these two lines look like for the code to work?

Working example
document.getElementById("myBtn").addEventListener("click", myFun);
async function myFun() {
const isTest = Math.random() > 0.5 //here you place your condition
const res = isTest ? await fetch1() : await fetch1() //here you should have different fetches for A and B
console.log(res)
document.getElementById("demo").innerHTML = res.message;
}
async function fetch1() {
//I took the link from some other SO answer as I was running into CORS problems with e.g. google.com
return fetch("https://currency-converter5.p.rapidapi.com/currency/list?format=json", {
"method": "GET",
"headers": {
"x-rapidapi-host": "currency-converter5.p.rapidapi.com",
"x-rapidapi-key": "**redacted**"
}
})
.then(response => response.json())
}
<button id="myBtn">button</button>
<div id="demo">demo</div>
<script src="https://unpkg.com/#babel/standalone#7/babel.min.js"></script>
<script type="text/babel">
</script>

Okay, I've worked on this a bit and this worker below seems to fulfill your requirements:
async function handleRequest(request) {
const NAME = "experiment-0";
try {
// The Responses below are placeholders. You can set up a custom path for each test (e.g. /control/somepath ).
const TEST_RESPONSE = await fetch(
"https://httpbin.org/image/jpeg",
request
);
const CONTROL_RESPONSE = await fetch(
"https://httpbin.org/image/png",
request
);
// Determine which group this requester is in.
const cookie = request.headers.get("cookie");
if (cookie && cookie.includes(`${NAME}=control`)) {
return CONTROL_RESPONSE;
} else if (cookie && cookie.includes(`${NAME}=test`)) {
return TEST_RESPONSE;
} else {
// If there is no cookie, this is a new client. Choose a group and set the cookie.
const group = Math.random() < 0.5 ? "test" : "control"; // 50/50 split
const response = group === "control" ? CONTROL_RESPONSE : TEST_RESPONSE;
return new Response(response.body, {
status: response.status,
headers: {
...response.headers,
"Set-Cookie": `${NAME}=${group}; path=/`,
},
});
}
} catch (e) {
var response = [`internal server error: ${e.message}`];
if (e.stack) {
response.push(e.stack);
}
return new Response(response.join("\n"), {
status: 500,
headers: {
"Content-type": "text/plain",
},
});
}
}
addEventListener("fetch", (event) => {
event.respondWith(handleRequest(event.request));
});
There are some issues with the snippet once you uncomment the fetch() parts:
Yes, the function needs to be async in order to use await keyword, so I added that.
Additionally, I think the 500 error you were seeing was also due to a bug in the snippet: You'll notice I form a new Response instead of modifying the one that was chosen from the ternary expression. This is because responses are immutable in the workers runtime, so adding headers to an already instantiated response will result in an error. Therefore, you can just create an entirely new Response with all the bits from the original one and it seems to work.
Also, in order to gain insight into errors in a worker, always a good idea to add the try/catch and render those errors in the worker response.
To get yours working on this, just replace the httpbin.org urls with whatever you need to A/B test.

HTTP does not recognize the body

this is my http code:
POST http://localhost:8000/register
host: localhost:8000
Content-Type: application/json
{
"id":111111,
"name":"example",
"email":"example#example.com",
"password":"example"
}
and the "/register" function is this (I am using react):
async register(ctx : RouterContext){
await console.log(ctx.request.body());
// const { value: {id,name, email, password} } = await ctx.request.body();
// const user = await User.findOne({email})
// if (user) {
// ctx.response.status = 422;
// ctx.response.body = {message : "Email is already in use"};
// return;
// }
// console.log(id,name, email, password);
}
I initially wanted to run what is commented out, to create a user. But when I do so I get a request error: ECONNREFUSED. So I just made it to console log what the body() actually is, but its empty. I have checked lots of websites and stack overflow posts yet no one has come across this bug where it doesn't identify my code. When I run it the way I just showed you I get this:
{ type: "json", value: Promise { <pending> } }

Please try:
async register(ctx: RouterContext){
console.log(await ctx.request.body().value);
}

How to integrate getAccessToken with fetch function to load data from DRF backend to React Frontend?

React newbie here, but proficient in Django.I have a simple fetch function which worked perfectly but then my project had no login authentication involved. Now that I have configured the login system, my backend refuses to serve requests with any access tokens. My login authentication is very new to me and was more or less copied from somewhere. I am trying to understand it but am not able to. I just need to know how to convert my simple fetch function to include the getAccessToken along the request in it's headers so my backend serves that request.
Here is my previously working simple fetch function :
class all_orders extends Component {
state = {
todos: []
};
async componentDidMount() {
try {
const res = await fetch('http://127.0.0.1:8000/api/allorders/'); // fetching the data from api, before the page loaded
const todos = await res.json();
console.log(todos);
this.setState({
todos
});
} catch (e) {
console.log(e);
}
}
My new login JWT authentication system works perfectly, but my previous code is not working and I keep getting error
"detail": "Authentication credentials were not provided."
This is is the accesstoken I am not able to 'combine' with my preivous fetch function:
const getAccessToken = () => {
return new Promise(async (resolve, reject) => {
const data = reactLocalStorage.getObject(API_TOKENS);
if (!data)
return resolve('No User found');
let access_token = '';
const expires = new Date(data.expires * 1000);
const currentTime = new Date();
if (expires > currentTime) {
access_token = data.tokens.access;
} else {
try {
const new_token = await loadOpenUrl(REFRESH_ACCESS_TOKEN, {
method: 'post',
data: {
refresh: data.tokens.refresh,
}
});
access_token = new_token.access;
const expires = new_token.expires;
reactLocalStorage.setObject(API_TOKENS, {
tokens: {
...data.tokens,
access: access_token
},
expires: expires
});
} catch (e) {
try {
if (e.data.code === "token_not_valid")
signINAgainNotification();
else
errorGettingUserInfoNotification();
} catch (e) {
// pass
}
return reject('Error refreshing token', e);
}
}
return resolve(access_token);
});
};

If you're looking for a way how to pass headers in fetch request, it's pretty straight forward:
await fetch('http://127.0.0.1:8000/api/allorders/', {
headers: {
// your headers there as pair key-value, matching what your API is expecting, for example:
'details': getAccessToken()
}
})
Just don't forget to import your getAccessToken const, if that's put it another file, and I believe that would be it. Some reading on Fetch method

Running Async functions in Microsoft Bot Builder (with Node.JS)

I'm trying to make a test bot that, upon being chatted to responds with a (meaningless) string gotten from a JSON object through another API
Code:
var restify = require('restify');
var builder = require('botbuilder');
var request = require('request-promise');
// Setup Restify Server
var server = restify.createServer();
server.listen(process.env.port || process.env.PORT || 3978, function () {
console.log('%s listening to %s', server.name, server.url);
});
// Create chat connector for communicating with the Bot Framework Service
var connector = new builder.ChatConnector({
appId: process.env.MicrosoftAppId,
appPassword: process.env.MicrosoftAppPassword
});
// Listen for messages from users
server.post('/api/messages', connector.listen());
// Receive messages from the user and respond by echoing each message back (prefixed with 'You said:')
var bot = new builder.UniversalBot(connector, function (session) {
var text = await MyRequest()
session.send("%s", text);
});
async function MyRequest() {
var options = {
uri: "https://jsonplaceholder.typicode.com/posts/1",
method: "GET",
json: true
}
try {
var result = await request(options);
return result;
} catch (err) {
console.error(err);
}
}
The problem is the bot var isn't an asynch function, so I can't put await in it. If I remove await, the bot replies with Object Promise. I'm fairly inexperienced in JS overall, so can I get any pointers?
e: The Request part works great, I've tested it alone in a different js program

Have you tried this. If you are using ES6 compatible Node environment this should work
var bot = new builder.UniversalBot(connector, async function (session) {
// Use JSON.stringify() if MyRequest Promise will resolve a object
var text = await MyRequest()
session.send("%s", text);
});

If async/await isn't possible, how about returning a promise? like below:
function MyRequest() {
var options = {
uri: "https://jsonplaceholder.typicode.com/posts/1",
method: "GET",
json: true
}
return request(options);
}
And use Promise.then to act on the result, like so:
var bot = new builder.UniversalBot(connector, function (session) {
MyRequest().then(function(text) {
session.send("%s", text);
}).catch(function(error) {
session.send("%s", error);
});
});