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Nicolas Burtey
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Original file line number | Diff line number | Diff line change |
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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) { | ||
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}.`) | ||
}) | ||
} else { | ||
console.log("NFC is not supported") | ||
} | ||
} | ||
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useEffect(() => { | ||
// Check NFC permission on component mount | ||
navigator.permissions.query({ name: "nfc" }).then((result) => { | ||
if (result.state === "granted") { | ||
setHasNFCPermission(true) | ||
} else { | ||
setHasNFCPermission(false) | ||
} | ||
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// Optional: Listen for changes in permission | ||
result.onchange = () => { | ||
if (result.state === "granted") { | ||
setHasNFCPermission(true) | ||
} else { | ||
setHasNFCPermission(false) | ||
} | ||
} | ||
}) | ||
}, []) | ||
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React.useEffect(() => { | ||
console.log("nfcMessage", nfcMessage) | ||
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setNfcMessage( | ||
"lnurlw://boltcard.tiankii.app/v1/lnurl/b1pizbxx0ikdivim5tpt9csy9kezxi?p=960C0DDCE939D1295C301D6B1A65BE78&c=CDFC90874BCE5AF2", | ||
) | ||
}, []) | ||
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React.useEffect(() => { | ||
;(async () => { | ||
if (nfcMessage) { | ||
const lnurlParams = await getParams(nfcMessage) | ||
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console.log("lnurlParams", lnurlParams) | ||
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if (!("tag" in lnurlParams && lnurlParams.tag === "withdrawRequest")) { | ||
console.error("not a lnurl withdraw tag") | ||
return | ||
} | ||
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if (!paymentRequest) { | ||
console.error("no invoice to redeem") | ||
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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