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Nicolas Burtey
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Feb 15, 2024
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| import React, { useState, useEffect } from "react" | ||
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| import { getParams } from "js-lnurl" | ||
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| type Props = { | ||
| paymentRequest: string | undefined | ||
| } | ||
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| function NFCComponent({ paymentRequest }: Props) { | ||
| const [hasNFCPermission, setHasNFCPermission] = useState(false) | ||
| const [nfcMessage, setNfcMessage] = useState("") | ||
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| const decodeNDEFRecord = (record) => { | ||
| // Ensure that the record's data is an instance of ArrayBuffer | ||
| if (record.data instanceof ArrayBuffer) { | ||
| const decoder = new TextDecoder(record.encoding || "utf-8") | ||
| return decoder.decode(record.data) | ||
| } else { | ||
| // If it's not an ArrayBuffer, it might be a DataView or another typed array. | ||
| // In that case, we can create a new Uint8Array from the buffer of the DataView. | ||
| const decoder = new TextDecoder(record.encoding || "utf-8") | ||
| return decoder.decode(new Uint8Array(record.data.buffer)) | ||
| } | ||
| } | ||
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| const handleNFCScan = () => { | ||
| if (!("NDEFReader" in window)) { | ||
| console.error("NFC is not supported") | ||
| return | ||
| } | ||
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| console.log("NFC is supported, start reading") | ||
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| const ndef = new NDEFReader() | ||
| ndef | ||
| .scan() | ||
| .then(() => { | ||
| console.log("NFC scan started successfully.") | ||
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| ndef.onreading = (event) => { | ||
| console.log("NFC tag read.") | ||
| const record = event.message.records[0] | ||
| const text = decodeNDEFRecord(record) | ||
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| if (text.toLowerCase().includes("lnurl")) { | ||
| setNfcMessage(text) | ||
| // Handle your "lnurl" logic here... | ||
| } | ||
| } | ||
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| ndef.onreadingerror = () => { | ||
| console.log("Cannot read data from the NFC tag. Try another one?") | ||
| } | ||
| }) | ||
| .catch((error) => { | ||
| console.log(`Error! Scan failed to start: ${error}.`) | ||
| }) | ||
| } | ||
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| useEffect(() => { | ||
| ;(async () => { | ||
| if (!("permissions" in navigator)) { | ||
| console.error("Permissions API not supported") | ||
| return | ||
| } | ||
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| const result = await navigator.permissions.query({ name: "nfc" }) | ||
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| console.log("result permission query", result) | ||
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| if (result.state === "granted") { | ||
| setHasNFCPermission(true) | ||
| } else { | ||
| setHasNFCPermission(false) | ||
| } | ||
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| result.onchange = () => { | ||
| if (result.state === "granted") { | ||
| setHasNFCPermission(true) | ||
| } else { | ||
| setHasNFCPermission(false) | ||
| } | ||
| } | ||
| })() | ||
| }, [setHasNFCPermission]) | ||
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| React.useEffect(() => { | ||
| console.log("hasNFCPermission", hasNFCPermission) | ||
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| if (hasNFCPermission) { | ||
| handleNFCScan() | ||
| } | ||
| }, [hasNFCPermission]) | ||
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| React.useEffect(() => { | ||
| ;(async () => { | ||
| if (!nfcMessage) { | ||
| console.error("no nfc message") | ||
| return | ||
| } | ||
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| if (!paymentRequest) { | ||
| console.error("no invoice to redeem") | ||
| return | ||
| } | ||
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| const lnurlParams = await getParams(nfcMessage) | ||
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| if (!("tag" in lnurlParams && lnurlParams.tag === "withdrawRequest")) { | ||
| console.error("not a lnurl withdraw tag") | ||
| return | ||
| } | ||
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| const { callback, k1 } = lnurlParams | ||
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| const urlObject = new URL(callback) | ||
| const searchParams = urlObject.searchParams | ||
| searchParams.set("k1", k1) | ||
| searchParams.set("pr", paymentRequest) | ||
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| const url = urlObject.toString() | ||
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| const result = await fetch(url) | ||
| if (result.ok) { | ||
| const lnurlResponse = await result.json() | ||
| if (lnurlResponse?.status?.toLowerCase() !== "ok") { | ||
| console.error(lnurlResponse, "error with redeeming") | ||
| } | ||
| } else { | ||
| console.error(result.text(), "error with submitting withdrawalRequest") | ||
| } | ||
| })() | ||
| }, [nfcMessage, paymentRequest]) | ||
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| return ( | ||
| <div> | ||
| {!hasNFCPermission && <button onClick={handleNFCScan}>Start NFC Scan</button>} | ||
| {nfcMessage && <div>LNURL: {nfcMessage}</div>} | ||
| </div> | ||
| ) | ||
| } | ||
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| export default NFCComponent |
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