our-nostrize/contentScript.js

async function generateKey() {
    return await crypto.subtle.generateKey(
        {
            name: "ECDSA",
            namedCurve: "P-256"
        },
        true,   // Whether the key is extractable (i.e., can be used outside the Crypto API)
        ["sign", "verify"] // Can be used for signing and verification
    );
}

// Convert the data (e.g., event hash) to an ArrayBuffer
function str2ab(str) {
    const buf = new ArrayBuffer(str.length * 2); // 2 bytes for each char
    const bufView = new Uint16Array(buf);
    for (let i = 0, strLen = str.length; i < strLen; i++) {
        bufView[i] = str.charCodeAt(i);
    }
    return buf;
}

// Sign the event hash
async function signEventHash(privateKey, eventHash) {
    const encodedEventHash = str2ab(eventHash);
    const signature = await crypto.subtle.sign(
        {
            name: "ECDSA",
            hash: { name: "SHA-256" } // Choose the hash algorithm you want to use
        },
        privateKey,
        encodedEventHash // The data you want to sign
    );
    return new Uint8Array(signature);
}

function byteArrayTo64BytesHex(byteArray) {
    // Convert the byte array to a hex string
    let hex = Array.from(byteArray, function(byte) {
        return ('0' + (byte & 0xFF).toString(16)).slice(-2);
    }).join('');

    // Ensure the hex string is exactly 128 characters long (64 bytes)
    if (hex.length > 128) {
        hex = hex.slice(0, 128); // Truncate if it's too long
    } else {
        hex = hex.padEnd(128, '0'); // Pad with zeros if it's too short
    }

    return hex;
}

function stringTo64BytesHex(str) {
    // Convert the string to a hexadecimal string
    let hex = Array.from(str, function(c) {
        return c.charCodeAt(0).toString(16).padStart(2, '0');
    }).join('');

    // Ensure the hex string is exactly 128 characters long (64 bytes)
    if (hex.length > 128) {
        hex = hex.slice(0, 128); // Truncate if it's too long
    } else {
        hex = hex.padEnd(128, '0'); // Pad with zeros if it's too short
    }

    return hex;
}

function stringTo32BytesHex(str) {
    // Convert the string to a hexadecimal string
    let hex = Array.from(str, function(c) {
        return c.charCodeAt(0).toString(16).padStart(2, '0');
    }).join('');

    // Ensure the hex string is exactly 64 characters long (32 bytes)
    if (hex.length > 64) {
        hex = hex.slice(0, 64); // Truncate if it's too long
    } else {
        hex = hex.padEnd(64, '0'); // Pad with zeros if it's too short
    }

    return hex;
}

const relayUrl = "wss://relay.sc24.steffen-roertgen.de"; 
const socket = new WebSocket(relayUrl);
const publicKey = 'npub1r30l8j4vmppvq8w23umcyvd3vct4zmfpfkn4c7h2h057rmlfcrmq9xt9ma';

async function signEvent(event, privateKey) {
    const eventHash = await hashEvent(event); // You need to create a hash of the event
    const signature = await signEventHash(privateKey, eventHash);
    event.sig = byteArrayTo64BytesHex(signature);
    event.id = stringTo32BytesHex(eventHash); // The event ID is the hash of the event
}

// Example function to hash an event
async function hashEvent(event) {
    const eventString = JSON.stringify([event.pubkey, event.created_at, event.kind, event.tags, event.content]);
    const encoder = new TextEncoder();
    const data = encoder.encode(eventString);
    const hashBuffer = await crypto.subtle.digest('SHA-256', data);
    const hashArray = Array.from(new Uint8Array(hashBuffer));
    return hashArray.map(byte => byte.toString(16).padStart(2, '0')).join('');
}

// Send the event to the relay
async function sendEventToRelay(event) {
    const privateKey = await generateKey(); 
    await signEvent(event, privateKey.privateKey);

    socket.send(JSON.stringify(["EVENT", event]));
    console.log("Event sent to the relay:", event);

    socket.addEventListener('message', function (message) {
        console.log("Received message from relay:", message.data);
    });

    socket.addEventListener('error', function (error) {
        console.error("WebSocket error:", error);
    });

    socket.addEventListener('close', function () {
        console.log("WebSocket connection closed");
    });
}

function findLDJSONScripts() {
    const scripts = document.querySelectorAll('script[type="application/ld+json"]');
    const jsonData = [];

    scripts.forEach(script => {
        try {
            const json = JSON.parse(script.textContent);
            jsonData.push(json);
        } catch (e) {
            console.error("Error parsing JSON-LD", e);
        }
    });

    return jsonData;
}

window.addEventListener('load', myMain);

function myMain() {
    console.log("DOM fully loaded and parsed");

    const ldJsonData = findLDJSONScripts();

    if (ldJsonData.length > 0) {
        console.log(ldJsonData[0])
        const name1 = ldJsonData[0]['name']
        const description1 = ldJsonData[0]['description']
        const dlgtext = `${name1}\n\n${description1}\n\nSend nostr event to relay?`
        const userConfirmed = confirm(dlgtext);

        if (userConfirmed) {
            let event = {
                id: '',           // The ID of the event will be filled in after signing
                pubkey: stringTo32BytesHex(publicKey),       // Your public key
                created_at: Math.floor(Date.now() / 1000), // Current timestamp in seconds
                kind: 1,          // Kind 1 usually refers to a "note" or text event
                tags: [],         // An array of tags (if any)
                content: description1, // The message content
                sig: ''           // Signature will be added after signing
            };
            sendEventToRelay(event);
            alert('data sent to nostr relay')

        }

    }
}


/*
// contentScript.js

// Function to find and return the content of ld+json scripts
function findLDJSONScripts() {
    const scripts = document.querySelectorAll('script[type="application/ld+json"]');
    //const scripts = document.querySelectorAll('class');
    const jsonData = [];
    
    //console.log(scripts); // Steffen debugging

    scripts.forEach(script => {
        try {
            const json = JSON.parse(script.textContent);
            jsonData.push(json);
        } catch (e) {
            console.error("Error parsing JSON-LD", e);
        }
    });

    return jsonData;
}

window.addEventListener('load', myMain);

function myMain() {
    //alert('Die Seite wurde vollständig geladen!');

    console.log("DOM fully loaded and parsed");

    const ldJsonData = findLDJSONScripts();

    if (ldJsonData.length > 0) {

        console.log("LD+JSON scripts found:", ldJsonData);
        
        // Option 1: Render on the same page (e.g., append to body)
        const pre = document.createElement('pre');
        pre.textContent = JSON.stringify(ldJsonData, null, 2);
        document.body.appendChild(pre);
        
        // Option 2: Send data to the background script for the popup
        chrome.runtime.sendMessage({type: "ldJsonData", data: ldJsonData});
    }
}

// //window.onload
// window.addEventListener('load', Meldung);
// //document.addEventListener("DOMContentLoaded", function() {
// //window.addEventListener("load", function() {
// //document.addEventListener("DOMContentLoaded", function() { 
//     // Your code here will run after the DOM is fully loaded
// });
// Send the extracted JSON-LD data to the popup or render it directly
//const ldJsonData = findLDJSONScripts();
*/