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index.tsx
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import axios from "axios"
import Head from "next/head"
import Image from "next/image"
import { useEffect, useState } from "react"
import { useZuAuth } from "zuauth"
import { EdDSATicketFieldsToReveal } from "@pcd/zk-eddsa-event-ticket-pcd"
import Toggle from "@/components/Toggle"
import DisplayRevealedFields from "@/components/DisplayRevealedFields"
import DeveloperPanel from "@/components/DeveloperPanel"
const defaultSetOfTicketFieldsToReveal: EdDSATicketFieldsToReveal = {
revealTicketId: false,
revealEventId: true,
revealProductId: true,
revealTimestampConsumed: false,
revealTimestampSigned: false,
revealAttendeeSemaphoreId: false,
revealIsConsumed: false,
revealIsRevoked: false,
revealTicketCategory: false,
revealAttendeeEmail: true,
revealAttendeeName: false
}
export default function Home() {
const { authenticate, pcd } = useZuAuth()
const [user, setUser] = useState<any>()
const [developerMode, setDeveloperMode] = useState(false);
const [ticketFieldsToReveal, setTicketFieldsToReveal] = useState<EdDSATicketFieldsToReveal>(defaultSetOfTicketFieldsToReveal);
// Every time the page loads, an API call is made to check if the
// user is logged in and, if they are, to retrieve the current session's user data
// and local storage data (to guarantee consistency across refreshes).
useEffect(() => {
; (async function () {
const { data } = await axios.get("/api/user")
setUser(data.user)
const fields = localStorage.getItem("ticketFieldsToReveal");
const mode = localStorage.getItem("developerMode")
if (fields) setTicketFieldsToReveal(JSON.parse(fields));
if (mode) setDeveloperMode(JSON.parse(mode))
})()
}, [])
// When the popup is closed and the user successfully
// generates the PCD, they can login.
useEffect(() => {
; (async function () {
if (pcd) {
const { data } = await axios.post("/api/login", { pcd })
setUser(data.user)
}
})()
}, [pcd])
// Before logging in, the PCD is generated with the nonce from the
// session created on the server.
// Note that the nonce is used as a watermark for the PCD. Therefore,
// it will be necessary on the server side to verify that the PCD's
// watermark matches the session nonce.
const login = async () => {
const { data } = await axios.post("/api/nonce")
authenticate(
developerMode ? { ...ticketFieldsToReveal } : { ...defaultSetOfTicketFieldsToReveal },
data.nonce
)
}
// Logging out simply clears the active session, local storage and state.
const logout = async () => {
await axios.post("/api/logout")
setUser(false)
localStorage.removeItem("ticketFieldsToReveal")
localStorage.removeItem("developerMode")
setTicketFieldsToReveal(defaultSetOfTicketFieldsToReveal)
setDeveloperMode(false)
}
const handleToggleField = (fieldToReveal: keyof EdDSATicketFieldsToReveal) => {
setTicketFieldsToReveal(prevState => {
const fieldsToReveal = {
...prevState,
[fieldToReveal]: !prevState[fieldToReveal]
};
localStorage.setItem("ticketFieldsToReveal", JSON.stringify(fieldsToReveal));
return fieldsToReveal;
});
};
const handleSetDeveloperMode = () => {
setDeveloperMode(value => {
const newValue = !value
if (newValue) {
localStorage.setItem("ticketFieldsToReveal", JSON.stringify(ticketFieldsToReveal));
} else {
setTicketFieldsToReveal(defaultSetOfTicketFieldsToReveal)
localStorage.removeItem("ticketFieldsToReveal")
}
localStorage.setItem("developerMode", JSON.stringify(newValue))
return newValue
})
}
return (
<main className="flex min-h-screen flex-col items-center justify-center p-12 pb-32">
<Head>
<title>ZuAuth Example</title>
<link rel="icon" type="image/x-icon" href="/favicon.ico" />
</Head>
<div className="max-w-4xl w-full mx-auto">
<div className="flex justify-center">
<Image width="150" height="150" alt="ZuAuth Icon" src="/light-icon.png" />
</div>
<h1 className="my-4 text-2xl font-semibold text-center">
ZuAuth Example
</h1>
<p className="my-8 text-justify">
This demo illustrates how the{" "}
<a
className="text-blue-600 visited:text-purple-600"
href="http://npmjs.com/package/zuauth"
target="_blank"
>
<b>zuauth</b>
</a>{" "}
NPM package can be used in a simple authentication system with{" "}
<a className="text-blue-600 visited:text-purple-600" href="https://nextjs.org/" target="_blank">
NextJS
</a>{" "}
and{" "}
<a
className="text-blue-600 visited:text-purple-600"
href="https://github.com/vvo/iron-session"
target="_blank"
>
IronSession
</a>
. You can choose which ticket fields to reveal during the authentication process by enabling the Developer Mode.
We kindly invite you to check the{" "}
<a
className="text-blue-600 visited:text-purple-600"
href="https://github.com/cedoor/zuauth#readme"
target="_blank"
>
README file
</a>{" "}
in the repository to learn more about the code.
</p>
<div className="my-8 text-center">
<button
className="bg-blue-800 hover:bg-blue-900 text-white font-bold py-2 px-4 rounded"
onClick={!user ? login : logout}
>
{!user ? "Login" : "Log out"}
</button>
</div>
{!user &&
<>
<div className="my-8 text-center flex flex-col items-center">
<p className="mt-2 text-center">Developer Mode</p>
<Toggle
checked={developerMode}
onToggle={handleSetDeveloperMode}
/>
</div>
<div style={{ height: "300px" }}>
{developerMode && (
<DeveloperPanel
fieldsToReveal={ticketFieldsToReveal}
onToggleField={handleToggleField}
disabled={!!user}
/>
)}
</div>
</>
}
{user && <div className="my-8 text-center">
<DisplayRevealedFields user={user} revealedFields={ticketFieldsToReveal} /> </div>}
</div>
</main >
)
}