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proofs.tsx
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proofs.tsx
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import { useRouter } from "next/router"
import React, { useEffect, useState } from "react"
import { getMembersGroup, getGroup } from "@/utils/bandadaApi"
import Stepper from "@/components/stepper"
import { Identity, Group, generateProof } from "@semaphore-protocol/core"
import {
encodeBytes32String,
toBigInt,
decodeBytes32String,
toBeHex
} from "ethers"
import Divider from "@/components/divider"
// Component for managing feedback proofs.
export default function ProofsPage() {
const router = useRouter()
// State variables.
const [_identity, setIdentity] = useState<Identity>()
const [_loading, setLoading] = useState<boolean>(false)
const [_renderInfoLoading, setRenderInfoLoading] = useState<boolean>(false)
const [_feedback, setFeedback] = useState<string[]>([])
// Environment variables.
const localStorageTag = process.env.NEXT_PUBLIC_LOCAL_STORAGE_TAG!
const groupId = process.env.NEXT_PUBLIC_BANDADA_GROUP_ID!
// Effect to load user identity from local storage.
useEffect(() => {
// Load identity from local storage or redirect to home.
const identityString = localStorage.getItem(localStorageTag)
if (!identityString) {
router.push("/")
return
}
const identity = new Identity(identityString)
setIdentity(identity)
}, [router, localStorageTag])
// Effect to fetch feedback on component mount.
useEffect(() => {
getFeedback()
}, [])
// Function to send feedback.
const sendFeedback = async () => {
if (!_identity) {
return
}
// Prompt user for feedback.
// The feedback can be whatever message you'd like.
const feedback = prompt("Please enter your feedback:")
// Fetch group members and generate proof.
const users = await getMembersGroup(groupId)
if (feedback && users) {
setLoading(true)
try {
// Get the Bandada group details.
const bandadaGroup = await getGroup(groupId)
if (bandadaGroup === null) {
alert("The Bandada group does not exist.")
return
}
const semaphoreGroup = new Group(users)
const message = toBigInt(encodeBytes32String(feedback)).toString()
const proof = await generateProof(
_identity,
semaphoreGroup,
message,
groupId
)
// Send feedback to the server.
const response = await fetch("api/send-feedback", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
merkleTreeDepth: proof.merkleTreeDepth,
merkleTreeRoot: proof.merkleTreeRoot,
feedback: message,
nullifierHash: proof.nullifier,
points: proof.points
})
})
// Handle response.
if (response.status === 200) {
const data = await response.json()
console.log(data[0].message)
if (data) setFeedback([data[0].message, ..._feedback])
console.log(`Your feedback was posted 🎉`)
} else {
const text = await response.text()
console.log(text)
alert(text)
}
} catch (error) {
console.error(error)
alert("Some error occurred, please try again!")
} finally {
setLoading(false)
}
}
}
// Function to fetch feedback from the server.
const getFeedback = async () => {
setRenderInfoLoading(true)
try {
const response = await fetch("api/get-feedback", {
method: "GET",
headers: { "Content-Type": "application/json" }
})
const messages = await response.json()
if (response.status === 200) {
setFeedback(messages.map((message: any) => message.message))
console.log("Feedback retrieved from the database")
} else {
alert("Some error occurred, please try again!")
}
} catch (error) {
console.error(error)
alert("Some error occurred, please try again!")
} finally {
setRenderInfoLoading(false)
}
}
// Function to render feedback UI.
const renderFeedback = () => {
return (
<div className="lg:w-2/5 md:w-2/4 w-full">
{/* Feedback display and interaction */}
<div className="flex justify-between items-center mb-10">
<div className="text-2xl font-semibold text-slate-700">
Feedback ({_feedback?.length})
</div>
<div>
<button
className="flex justify-center items-center w-auto space-x-1 verify-btn text-lg font-medium rounded-md bg-gradient-to-r text-slate-700"
onClick={getFeedback}
>
<span>Refresh</span>
</button>
</div>
</div>
<div className="flex justify-center items-center my-3">
<button
className="flex justify-center items-center w-full space-x-3 disabled:cursor-not-allowed disabled:opacity-50 verify-btn text-lg font-medium rounded-md px-5 py-3 bg-gradient-to-r from-blue-700 to-indigo-700 hover:from-blue-800 hover:to-indigo-800 text-slate-100"
onClick={sendFeedback}
disabled={_loading || _renderInfoLoading}
>
{_loading && <div className="loader"></div>}
<span>Send Feedback</span>
</button>
</div>
{_renderInfoLoading && (
<div className="flex justify-center items-center mt-20 gap-2">
<div className="loader-app"></div>
<div>Fetching feedback</div>
</div>
)}
{_feedback ? (
<div className="grid-rows-1 place-content-center">
<div className="space-y-3">
{_feedback?.map((feedback, i) => (
<div
key={i}
className="overflow-auto border-2 p-3 border-slate-300 space-y-3"
>
{decodeBytes32String(toBeHex(feedback))}
</div>
))}
</div>
</div>
) : (
<div className="flex justify-center items-center mt-20">
<div className="loader-app"></div>
</div>
)}
</div>
)
}
return (
<div>
<div>
<div className="flex justify-center items-center">
<h1 className="text-3xl font-semibold text-slate-700">Proofs</h1>
</div>
<div className="flex justify-center items-center mt-10">
<span className="lg:w-2/5 md:w-2/4 w-full">
<span>
Members can anonymously{" "}
<a
className="space-x-1 text-blue-700 hover:underline"
href="https://docs.semaphore.pse.dev/guides/proofs"
target="_blank"
rel="noreferrer noopener nofollow"
>
prove
</a>{" "}
that they are part of a group and send their anonymous messages.
Messages could be votes, leaks, reviews, or feedback.
</span>
<Divider />
</span>
</div>
<div className="flex justify-center items-center mt-5">
{renderFeedback()}
</div>
<div className="flex justify-center items-center mt-10">
<div className="lg:w-2/5 md:w-2/4 w-full">
<Stepper step={3} onPrevClick={() => router.push("/groups")} />
</div>
</div>
</div>
</div>
)
}