sol-mem-gen/src/app/api/tweet/route.ts

import { NextRequest, NextResponse } from 'next/server';

import { saveTweet, verifySignatureInTweet } from '../../../utils/verifyTweet';

export async function POST(req: NextRequest): Promise<NextResponse> {
  try {
    const { tweetUrl } = await req.json();

    const url = `https://publish.twitter.com/oembed?url=${tweetUrl}&maxwidth=600`;

    const response = await fetch(url);
    const data = await response.json();

    const { handle, txSignature, memeUrl } = extractData(data.html);

    if (!handle || !txSignature) {
      return NextResponse.json(
        { error: 'Could not extract tweet data' },
        { status: 500 }
      )
    }

    const isSigVerified = await verifySignatureInTweet(txSignature);
    const isHandleCorrect = handle === process.env.NEXT_PUBLIC_ACCOUNT_HANDLE;

    // TODO: Verify dynamic page URL in tweet
    const isVerified = isSigVerified && isHandleCorrect;
    if (!isVerified) {
      throw new Error('Tweet is not valid');
    }

    const { isFourthUser } = await saveTweet({ transactionSignature: txSignature, url: memeUrl });
    if (isFourthUser) {
      createTokenLockForRecipient();
    }

    return NextResponse.json({ success: isVerified, message: 'Tweet verified' })
  } catch (error) {
    console.error('Error while verifying tweet:', error)
    return NextResponse.json(
      { error: 'Failed to verify tweet' },
      { status: 500 }
    )
  }
}

const extractData = (tweet: string | object) => {
  const tweetText = typeof tweet === 'string' ? tweet : JSON.stringify(tweet);

  const decodedTweet = tweetText.replace(/&#39;/g, "'").replace(/&quot;/g, '"');

  const urlMatch = decodedTweet.match(/<a href="(https:\/\/t.co\/[^"]+)">/);
  const txSignatureMatch = decodedTweet.match(/TX Hash: '([^']+)'/);
  const handleMatch = decodedTweet.match(/@([A-Za-z0-9_]+)/);

  return {
    memeUrl: urlMatch ? urlMatch[1] : null,
    txSignature: txSignatureMatch ? txSignatureMatch[1].trim() : null,
    handle: handleMatch ? handleMatch[1] : null,
  };
};

// TODO: Implement function to create lock for a recipient
const createTokenLockForRecipient = () => {
  console.log('Lock created');
}