kitepad/index.html at main · irhdab/kitepad · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>KitePad</title>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Exo+2:ital,wght@0,100..900;1,100..900&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="style.css">
    <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github-dark.min.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/katex.min.css">
    <script src="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/katex.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/contrib/auto-render.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/dompurify@3.0.6/dist/purify.min.js"></script>
    <script src="https://cdn.jsdelivr.net/gh/davidshimjs/qrcodejs@master/qrcode.min.js"></script>
    <script type="module">
        import { CodeJar } from 'https://cdn.jsdelivr.net/npm/codejar@3.2.2/codejar.js';
        window.CodeJar = CodeJar;
    </script>
    <style>
        .katex { font-size: 1.1em; }
        .embed-container { margin: 15px 0; max-width: 100%; }
        iframe { border-radius: 8px; border: none; }
    </style>
</head>
<body>
<div class="container">
    <div class="nav-links">
        <a href="/view" class="nav-link">View Posts</a>
        <a href="https://github.com/irhdab/kitepad/tree/main" class="nav-link" target="_blank">GitHub</a>
    </div>
    <div class="header-main">
        <h1 class="title-text">KitePad</h1>
        <span class="tagline">Zero-knowledge pastebin. Configure expiry, view limit and end‑to‑end encryption in one place.</span>
    </div>
    <hr>
    <div id="secret-banner" class="secret-banner hidden">
        <span>⚠️ Looks like this might contain credentials. Make sure you trust the recipient.</span>
    </div>

    <div class="option-group" style="margin-bottom: 20px;">
        <label for="title">Title (Optional)</label>
        <input type="text" id="title" class="style-input" placeholder="Enter title (e.g. My Notes)" style="width: 100%;">
    </div>

    <div class="options-container">
        <div class="option-group">
            <label for="expiration">Paste Expiration:</label>
            <select id="expiration" class="style-select">
                <option value="never">Never</option>
                <option value="10m">10 Minutes</option>
                <option value="1h">1 Hour</option>
                <option value="1d">1 Day</option>
                <option value="1w">1 Week</option>
                <option value="burn">Burn After Reading</option>
            </select>
        </div>
        <div class="option-group">
            <label for="exposure">Paste Exposure:</label>
            <select id="exposure" class="style-select">
                <option value="public">Public</option>
                <option value="unlisted">Unlisted</option>
            </select>
        </div>
        <div class="option-group">
            <label for="view_limit">View Limit (Optional)</label>
            <input type="number" id="view_limit" class="style-input" placeholder="e.g. 5" min="1" style="width: 80px;">
        </div>
        <div class="option-group">
            <label for="password">Password (optional)</label>
            <input type="password" id="password" class="style-input" placeholder="Enter password">
        </div>
    </div>
    <div class="options-container" style="margin-top: -5px; margin-bottom: 20px;">
        <label style="font-size: 13px; color: var(--text-secondary); cursor: pointer; display: flex; align-items: center; gap: 8px;">
            <input type="checkbox" id="is_encrypted"> End-to-End Encryption (E2EE) - <span style="font-size: 11px; opacity: 0.7;">Password will be required to decrypt. Content is never sent raw to server.</span>
        </label>
    </div>

    <div class="editor-header">
        <div class="tab-container">
            <button id="editor-tab" class="tab-btn active" onclick="showEditor()">Editor</button>
            <button id="preview-tab" class="tab-btn" onclick="showPreview()">Preview</button>
        </div>
        <div style="display: flex; gap: 15px; align-items: center;">
            <span id="reading-time" class="char-count" style="margin-right: 10px;">Est. Reading: 0 min</span>
            <span id="char-count" class="char-count">0</span>
        </div>
    </div>
    <div id="editor-wrapper">
        <div class="editor codejar" id="editor" placeholder="Write your markdown here..." contenteditable="true"></div>
    </div>
    <div id="preview-pane" class="preview-pane content hidden"></div>

    <div class="button-container">
        <button class="publish-button" onclick="publishContent()">Publish</button>
    </div>

    <div id="result-container" class="result-container" style="display: none;">
        <p>Your paste is ready!</p>
        <div class="link-box">
            <span id="paste-link"></span>
            <button class="copy-btn" onclick="copyResultLink()">Copy</button>
        </div>
        <div id="qrcode-container" style="margin-top: 20px; display: flex; justify-content: center; background: white; padding: 10px; border-radius: 8px; width: fit-content; margin-left: auto; margin-right: auto;"></div>
        <p style="font-size: 11px; margin-top: 10px;">Pro tip: You can access the raw text by adding <code>?raw=1</code> to the URL.</p>
    </div>
</div>

<script>
    // Fetch CSRF token on load
    fetch('/api/get_token.php')
        .then(res => res.json())
        .then(data => {
            window.csrfToken = data.csrf_token;
        })
        .catch(err => console.error("Failed to fetch CSRF token:", err));

    const MAX_PASTE_SIZE = 1024 * 1024; // 1MB

    let debounceTimer;
    let jar; // CodeJar instance

    // Load draft on startup
    window.addEventListener('DOMContentLoaded', () => {
        // Initialize CodeJar for syntax highlighting
        const editorElement = document.getElementById('editor');
        const highlight = editor => {
            // highlight.js does not line-wrap natively well if we don't handle it,
            // but for markdown/code we can let it highlight
            editor.innerHTML = hljs.highlightAuto(editor.textContent).value;
        };
        // If we want raw markdown without weird syntax bugs while typing,
        // a simple highlighter wrapper is better. For now we just use a basic text highlight or no highlight
        // until we actually want the syntax to colorize.
        // Actually, the user asked for Prism.js or CodeJar with Highlight.js.
        // Let's use Highlight.js with a markdown language enforced if possible, or auto.
        const highlightMarkdown = editor => {
            let code = editor.textContent;
            editor.innerHTML = hljs.highlight(code, {language: 'markdown'}).value;
        };
        jar = CodeJar(editorElement, highlightMarkdown, {tab: '  '});

        jar.onUpdate(code => {
            onEditorInput(code);
        });

        // Keyboard shortcuts
        editorElement.addEventListener('keydown', (e) => {
             if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
                 e.preventDefault();
                 publishContent();
             }
        });

        // Handle Edit/Clone Mode
        const params = new URLSearchParams(window.location.search);
        const editUid = params.get('edit');
        const cloneUid = params.get('clone');
        const targetUid = editUid || cloneUid;

        let draftKey = 'paste_draft';
        if (editUid) draftKey += '_edit_' + editUid;
        const draft = localStorage.getItem(draftKey);
        if (draft) {
            jar.updateCode(draft);
            updateStats(draft);
            console.log("Draft restored from local storage.");
        }

        if (targetUid) {
            fetch(`/api/view_content.php?id=${targetUid}&json=1`)
                .then(async res => {
                    if (res.status === 401) {
                        const pw = prompt("This post is password protected. Enter password to edit/clone:");
                        if (pw) {
                            alert("Please view and unlock the post first, then click Edit/Clone from there.");
                            window.location.href = `/v/${targetUid}`;
                        }
                        throw new Error("Unauthorized");
                    }
                    if (!res.ok) throw new Error("Failed to fetch post");
                    return res.json();
                })
                .then(data => {
                    if (!data || !data.content) return;
                    jar.updateCode(data.content);
                    updateStats(data.content);

                    // Restore metadata
                    document.getElementById('title').value = data.title || "";
                    if (data.exposure) document.getElementById('exposure').value = data.exposure;
                    if (data.view_limit) document.getElementById('view_limit').value = data.view_limit;
                    document.getElementById('is_encrypted').checked = !!data.is_encrypted;
                    if (data.burn_on_read) {
                        document.getElementById('expiration').value = 'burn';
                    }

                    if (editUid) {
                        window.isEditMode = true;
                        window.editUid = editUid;
                        document.querySelector('.publish-button').textContent = "Update Post";
                        document.querySelector('.title-text').textContent = "Edit Paste";
                    }
                })
                .catch(err => {
                    if (err.message !== "Unauthorized") {
                        console.error("Error loading post:", err);
                    }
                });
        }
    });

    function updateStats(content) {
        const count = content.length;
        const charCountEl = document.getElementById('char-count');
        charCountEl.textContent = count.toLocaleString();

        if (count > MAX_PASTE_SIZE) {
            charCountEl.style.color = "#ff4d4d";
            charCountEl.style.fontWeight = "bold";
        } else {
            charCountEl.style.color = "";
            charCountEl.style.fontWeight = "";
        }

        const words = content.trim().split(/\s+/).length || 0;
        const readingTime = Math.ceil(words / 200);
        document.getElementById('reading-time').textContent = `Est. Reading: ${readingTime} min`;
    }

    function scanForSecrets(text) {
        const patterns = [
            /sk-[a-zA-Z0-9]{48}/,       // OpenAI
            /AKIA[0-9A-Z]{16}/,         // AWS Access Key
            /-----BEGIN PRIVATE KEY-----/ // Generic Private Key
        ];
        return patterns.some(pattern => pattern.test(text));
    }

    function onEditorInput(content) {
        updateStats(content);

        // Secret Scanner
        const banner = document.getElementById('secret-banner');
        if (scanForSecrets(content)) {
            banner.classList.remove('hidden');
        } else {
            banner.classList.add('hidden');
        }

        let draftKey = 'paste_draft';
        if (window.isEditMode && window.editUid) draftKey += '_edit_' + window.editUid;
        localStorage.setItem(draftKey, content); // Save draft

        if (!document.getElementById('preview-pane').classList.contains('hidden')) {
            clearTimeout(debounceTimer);
            debounceTimer = setTimeout(updatePreview, 300); // 300ms debounce
        }
    }

    function autoEmbed(html) {
        // Youtube Links (marked turns them into anchor tags first)
        html = html.replace(/<a[^>]*href="https?:\/\/(?:www\.)?youtube\.com\/watch\?v=([a-zA-Z0-9_-]+)"[^>]*>.*?<\/a>/g,
            '<div class="embed-container"><iframe width="100%" height="450" src="https://www.youtube.com/embed/$1" frameborder="0" allowfullscreen></iframe></div>');
        // Plain Youtube URLs (not inside quotes)
        html = html.replace(/(?<!["'])(https?:\/\/(?:www\.)?youtube\.com\/watch\?v=([a-zA-Z0-9_-]+))/g,
            '<div class="embed-container"><iframe width="100%" height="450" src="https://www.youtube.com/embed/$2" frameborder="0" allowfullscreen></iframe></div>');
        return html;
    }

    function updatePreview() {
        const content = jar.toString();
        const previewPane = document.getElementById('preview-pane');
        let html = marked.parse(content);
        html = autoEmbed(html);
        previewPane.innerHTML = DOMPurify.sanitize(html, { ADD_TAGS: ['iframe'], ADD_ATTR: ['allow', 'allowfullscreen', 'frameborder', 'scrolling'] });

        // Highlight.js
        previewPane.querySelectorAll('pre code').forEach((block) => {
            hljs.highlightElement(block);
        });

        // KaTeX
        renderMathInElement(previewPane, {
            delimiters: [
                { left: '$$', right: '$$', display: true },
                { left: '$', right: '$', display: false },
                { left: '\\(', right: '\\)', display: false },
                { left: '\\[', right: '\\]', display: true }
            ],
            throwOnError: false
        });
    }

    function showEditor() {
        document.getElementById('editor-wrapper').classList.remove('hidden');
        document.getElementById('preview-pane').classList.add('hidden');
        document.querySelectorAll('.tab-btn')[0].classList.add('active');
        document.querySelectorAll('.tab-btn')[1].classList.remove('active');
    }

    function showPreview() {
        document.getElementById('editor-wrapper').classList.add('hidden');
        document.getElementById('preview-pane').classList.remove('hidden');
        document.querySelectorAll('.tab-btn')[0].classList.remove('active');
        document.querySelectorAll('.tab-btn')[1].classList.add('active');
        updatePreview();
    }

    // E2EE Encryption Helpers
    async function deriveKey(password, salt) {
        const encoder = new TextEncoder();
        const baseKey = await crypto.subtle.importKey(
            "raw", encoder.encode(password), "PBKDF2", false, ["deriveKey"]
        );
        return crypto.subtle.deriveKey(
            { name: "PBKDF2", salt, iterations: 100000, hash: "SHA-256" },
            baseKey, { name: "AES-GCM", length: 256 }, false, ["encrypt"]
        );
    }

    async function encryptData(text, password) {
        const encoder = new TextEncoder();
        const salt = crypto.getRandomValues(new Uint8Array(16));
        const iv = crypto.getRandomValues(new Uint8Array(12));
        const key = await deriveKey(password, salt);
        const encrypted = await crypto.subtle.encrypt(
            { name: "AES-GCM", iv }, key, encoder.encode(text)
        );

        // Combine Salt + IV + EncryptedData for easy storage
        const combined = new Uint8Array(salt.length + iv.length + encrypted.byteLength);
        combined.set(salt, 0);
        combined.set(iv, salt.length);
        combined.set(new Uint8Array(encrypted), salt.length + iv.length);

        // Return as base64
        return btoa(String.fromCharCode.apply(null, combined));
    }

    async function publishContent() {
        if (!window.csrfToken) {
            alert("Security session is still loading. Please wait a second and try again.");
            return;
        }
        let content = jar.toString();
        if (content.trim() === "") {
            alert("Please write something before publishing.");
            return;
        }

        if (content.length > MAX_PASTE_SIZE) {
            alert("The content is too large. The maximum size is 1MB (" + MAX_PASTE_SIZE.toLocaleString() + " characters). Current size: " + content.length.toLocaleString() + " characters.");
            return;
        }

        const expiration = document.getElementById('expiration').value;
        const exposure = document.getElementById('exposure').value;
        const password = document.getElementById('password').value;
        const viewLimit = document.getElementById('view_limit').value;
        const isEncrypted = document.getElementById('is_encrypted').checked;
        const title = document.getElementById('title').value;

        if (isEncrypted && !password) {
            alert("Encryption requires a password.");
            return;
        }

        if (isEncrypted) {
            try {
                content = await encryptData(content, password);
            } catch (e) {
                console.error(e);
                alert("Encryption failed.");
                return;
            }
        }

        let editToken = null;
        if (window.isEditMode && window.editUid) {
            editToken = localStorage.getItem('edit_token_' + window.editUid);
        }

        const response = await fetch('/save', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({
                content: content,
                title: title,
                expiration: expiration,
                exposure: exposure,
                password: isEncrypted ? "" : password, // If E2EE, don't store plain password
                view_limit: viewLimit,
                is_encrypted: isEncrypted,
                uid: window.isEditMode ? window.editUid : null,
                edit_token: editToken,
                csrf_token: window.csrfToken
            })
        });

        const resultContainer = document.getElementById('result-container');
        const pasteLinkSpan = document.getElementById('paste-link');

        if (response.ok) {
            const data = await response.json();

            // Save edit token for future updates
            if (data.edit_token) {
                localStorage.setItem('edit_token_' + data.id, data.edit_token);
            }

            // Create share URL (without the edit token to prevent accidental leakage)
            let shareUrl = window.location.origin + '/v/' + (data.id || window.editUid);

            pasteLinkSpan.textContent = shareUrl;

            // Generate QR Code
            const qrcodeContainer = document.getElementById('qrcode-container');
            qrcodeContainer.innerHTML = '';
            new QRCode(qrcodeContainer, {
                text: shareUrl,
                width: 128,
                height: 128,
                colorDark : "#000000",
                colorLight : "#ffffff",
                correctLevel : QRCode.CorrectLevel.H
            });

            resultContainer.style.display = 'block';

            // Redirect to the new paste after a short delay to let the user see the success message
            setTimeout(() => {
                window.location.href = shareUrl;
            }, 800);

            jar.updateCode("");
            let draftKey = 'paste_draft';
            if (window.isEditMode && window.editUid) draftKey += '_edit_' + window.editUid;
            localStorage.removeItem(draftKey); // Clear draft on success
            document.getElementById('password').value = "";
            document.getElementById('view_limit').value = "";
            document.getElementById('is_encrypted').checked = false;
            updateStats("");
            showEditor();
            window.scrollTo({ top: document.body.scrollHeight, behavior: 'smooth' });
        } else {
            const text = await response.text();
            let errorMessage = "Unknown error";
            try {
                const errorData = JSON.parse(text);
                errorMessage = errorData.message || errorMessage;
            } catch (e) {
                errorMessage = text.substring(0, 200) || "Empty response from server";
            }
            alert("Failed to publish content: " + errorMessage);
        }
    }

    function copyResultLink() {
        const link = document.getElementById('paste-link').textContent;
        navigator.clipboard.writeText(link).then(() => {
            alert("Link copied to clipboard!");
        });
    }
</script>

<footer class="site-footer">
    <div class="container">
        <hr>
        <p>&copy; 2026 KitePad. All rights reserved. <a href="https://github.com/irhdab/kitepad/tree/main" class="nav-link" target="_blank">GitHub</a> | <a href="/contact.html" class="nav-link">Contact</a> | <a href="/privacy.html" class="nav-link">Privacy Policy</a></p>
    </div>
</footer>
</body>
</html>