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Paper

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File size: 23,268 Bytes

<!DOCTYPE html>

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Paper</title>
    <style>
        :root {
            /* --- Cool Slate & Ink Palette --- */
            --bg-primary: #f9f9fb;
            --bg-secondary: #f1f3f6;
            --bg-tertiary: #e8ebf0;
            --text-primary: #2a324b;
            --text-secondary: #5c677d;
            --text-muted: #8a94a6;
            --accent: #4a69bd;
            --accent-hover: #3b5496;
            --success: #3e8e7e;
            --warning: #f0a500;
            --error: #d9534f;
            --border: #d1d8e0;
            --shadow: rgba(74, 105, 189, 0.1);
            --paper-shadow: rgba(42, 50, 75, 0.07);
            --radius: 8px;
            --transition: all 0.3s ease;
            --paper-texture: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f0ead6' fill-opacity='0.3'%3E%3Cpath d='M30 30c0-6.627-5.373-12-12-12s-12 5.373-12 12 5.373 12 12 12 12-5.373 12-12zm12 0c0-6.627-5.373-12-12-12s-12 5.373-12 12 5.373 12 12 12 12-5.373 12-12z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
        }

        * { 
            margin: 0; 
            padding: 0; 
            box-sizing: border-box; 
        }
      html, body {
    height: 100%;
}

        body { 
            font-family: 'Georgia', 'Times New Roman', serif;
            background: linear-gradient(135deg, #f9f6ef 0%, #f1ebe0 100%);
            background-attachment: fixed;
            color: var(--text-primary);
            line-height: 1.6;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--paper-texture);
            opacity: 0.4;
            pointer-events: none;
            z-index: 1;
        }

        /* Login Screen */
        .login-screen { 
            display: flex; 
            justify-content: center; 
            align-items: center; 
            height: 100%; 
            padding: 20px;
            position: relative;
            z-index: 2;
          background: var(--bg-secondary);
        }

        .login-screen::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            
            pointer-events: none;
        }

        .login-box { 
            text-align: center; 
            padding: 40px 35px; 
            border-radius: var(--radius); 
            background: var(--bg-primary);
            border: 2px solid var(--border);
            box-shadow: 
                0 8px 32px var(--paper-shadow),
                0 2px 8px var(--paper-shadow),
                inset 0 1px 0 rgba(255, 255, 255, 0.8);
            position: relative;
            z-index: 1;
            width: 100%;
            max-width: 380px;
        }

        .login-box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(212, 175, 55, 0.03) 100%);
            border-radius: var(--radius);
            pointer-events: none;
        }

        .login-box h1 { 
            margin-bottom: 8px; 
            color: var(--text-primary); 
            font-weight: 400; 
            font-size: 36px; 
            letter-spacing: -0.5px;
            font-family: 'Georgia', serif;
            position: relative;
        }

        .login-subtitle {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 32px;
            font-weight: 400;
            font-style: italic;
            line-height: 1.5;
        }

        .input-group {
            position: relative;
            margin-bottom: 28px;
        }

        .password-input { 
            width: 100%;
            padding: 18px 22px; 
            font-size: 16px; 
            border: 2px solid var(--border); 
            border-radius: var(--radius); 
            background: var(--bg-secondary);
            color: var(--text-primary);
            text-align: center; 
            letter-spacing: 1px; 
            outline: none; 
            transition: var(--transition);
            font-family: 'Courier New', monospace;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
        }

        .password-input:focus { 
            border-color: var(--accent); 
            box-shadow: 
                inset 0 2px 4px rgba(0, 0, 0, 0.03),
                0 0 0 3px rgba(212, 175, 55, 0.15);
            background: var(--bg-primary);
        }

        .password-input::placeholder {
            color: var(--text-muted);
            letter-spacing: normal;
            font-family: 'Georgia', serif;
            font-style: italic;
        }

        .enter-btn { 
            width: 100%;
            padding: 18px 32px; 
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
            color: var(--bg-primary); 
            border: none; 
            border-radius: var(--radius); 
            font-size: 16px; 
            font-weight: 500;
            cursor: pointer; 
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-family: 'Georgia', serif;
            box-shadow: 
                0 4px 15px rgba(212, 175, 55, 0.3),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
        }

        .enter-btn:hover:not(:disabled) { 
            transform: translateY(-2px);
            box-shadow: 
                0 6px 20px rgba(212, 175, 55, 0.4),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
        }

        .enter-btn:active {
            transform: translateY(0);
        }

        .enter-btn:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none;
        }

        .error { 
            color: var(--error); 
            margin-top: 16px; 
            font-size: 14px; 
            min-height: 20px;
            font-weight: 400;
            font-style: italic;
        }

        /* Editor Screen */
        .editor-screen { 
            display: none;
            height: 100%;
            background: var(--bg-primary);
            flex-direction: column;
            position: relative;
            z-index: 2;
        }

        .header { 
            padding: 15px; 
            background: var(--bg-secondary);
            border-bottom: 3px solid var(--border);
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 10px var(--paper-shadow);
            position: relative;
            flex-shrink: 0;
        }

        .header::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent 0%, var(--accent) 50%, transparent 100%);
            opacity: 0.3;
        }

        .header-left {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .app-title {
            font-size: 24px;
            font-weight: 400;
            color: var(--text-primary);
            font-family: 'Georgia', serif;
            letter-spacing: -0.5px;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .save-status { 
            font-size: 13px; 
            font-weight: 500;
            padding: 8px 14px; 
            border-radius: 20px; 
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            border: 1px solid var(--border);
            min-width: 80px;
            text-align: center;
            font-family: 'Georgia', serif;
        }

        .save-status.saving { 
            background: linear-gradient(135deg, var(--warning) 0%, #d4850f 100%);
            color: white;
            border-color: var(--warning);
        }
        
        .save-status.saved { 
            background: linear-gradient(135deg, var(--success) 0%, #5a8a69 100%);
            color: white;
            border-color: var(--success);
        }

        .word-count {
            font-size: 13px;
            color: var(--text-muted);
            font-weight: 400;
            font-family: 'Georgia', serif;
            font-style: italic;
        }

        .editor-container {
            flex: 1;
            position: relative;
            margin: 20px;
            border-radius: var(--radius);
            background: var(--bg-primary);
            border: 2px solid var(--border);
            box-shadow: 
                inset 0 2px 8px rgba(0, 0, 0, 0.03),
                0 4px 20px var(--paper-shadow);
        }

        .editor-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: 
                repeating-linear-gradient(
                    transparent,
                    transparent 29px
                );
            pointer-events: none;
            z-index: 1;
            border-radius: var(--radius);
        }

        .editor { 
            width: 100%; 
            height:100%;
            padding: 25px 30px; 
            border: none; 
            outline: none; 
            font-family: 'Georgia', 'Times New Roman', serif; 
            font-size: 16px; 
            line-height: 1.8; 
            resize: none; 
            background: transparent;
            color: var(--text-primary);
            position: relative;
            z-index: 2;
            border-radius: var(--radius);
        }

        .editor::placeholder {
            color: var(--text-muted);
            font-style: italic;
            opacity: 0.7;
        }

        /* Scrollbar styling */
        .editor::-webkit-scrollbar {
            width: 12px;
        }

        .editor::-webkit-scrollbar-track {
            background: var(--bg-tertiary);
            border-radius: 6px;
        }

        .editor::-webkit-scrollbar-thumb {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
            border-radius: 6px;
            border: 2px solid var(--bg-tertiary);
        }

        .editor::-webkit-scrollbar-thumb:hover {
            background: linear-gradient(135deg, var(--accent-hover) 0%, #9e7c15 100%);
        }

        /* Animation for mode switching */
        .fade-in {
            animation: fadeIn 0.4s ease-out;
        }

        @keyframes fadeIn {
            from { 
                opacity: 0; 
                transform: translateY(20px) scale(0.98);
            }
            to { 
                opacity: 1; 
                transform: translateY(0) scale(1);
            }
        }

        /* Mobile optimizations without @media */
        .login-box {
            min-height: auto;
        }

        .header-right {
            justify-content: flex-end;
        }

        .word-count {
            white-space: nowrap;
        }

        /* Focus improvements */
        .password-input:focus,
        .editor:focus {
            outline: none;
        }

        /* Subtle animations */
        .login-box {
            animation: slideUp 0.6s ease-out;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .editor-container {
            animation: paperUnfold 0.5s ease-out;
        }

        @keyframes paperUnfold {
            from {
                opacity: 0;
                transform: scale(0.95) rotateX(5deg);
            }
            to {
                opacity: 1;
                transform: scale(1) rotateX(0deg);
            }
        }

        /* Texture overlay for paper feel */
        .editor-container::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--paper-texture);
            opacity: 0.1;
            pointer-events: none;
            z-index: 1;
            border-radius: var(--radius);
        }
    </style>
</head>
<body>
    <div id="loginScreen" class="login-screen">
        <div class="login-box">
            <h1>Paper</h1>
            <p class="login-subtitle">Perfect for temporary notes and secure sharing. Deleted after two days.</p>

            <div class="input-group">
                <input type="password" id="passwordInput" class="password-input" placeholder="min-8-char password" minlength="8" maxlength="100">
            </div>
            
            <button onclick="login()" class="enter-btn">Enter</button>
            <div id="loginError" class="error"></div>
        </div>
    </div>

    <div id="editorScreen" class="editor-screen">
        <div class="header">
            <div class="header-left">
                <div class="app-title">Paper</div>
            </div>
            <div class="header-right">
                <div id="wordCount" class="word-count">0 words</div>
                <div id="saveStatus" class="save-status">Ready</div>
            </div>
        </div>
        <div class="editor-container">
            <textarea id="editor" class="editor" placeholder="Start typing..."></textarea>
        </div>
    </div>

    <script>
        let currentPassword = '';
        let currentSalt = null;
        let fileHash = '';
        let saveTimeout = null;
        let isWorking = false;

        const PBKDF2_ITERATIONS = 250000;

        // --- WORD COUNT ---
        function updateWordCount() {
            const text = document.getElementById('editor').value;
            const words = text.trim() ? text.trim().split(/\s+/).length : 0;
            const chars = text.length;
            document.getElementById('wordCount').textContent = `${words} words, ${chars} chars`;
        }

        // --- CRYPTOGRAPHY (unchanged) ---
        async function generateFilenameHash(password) {
            const encoder = new TextEncoder();
            const data = encoder.encode(password);
            const hashBuffer = await crypto.subtle.digest('SHA-256', data);
            const hashArray = Array.from(new Uint8Array(hashBuffer));
            return hashArray.map(b => b.toString(16).padStart(2, '0')).join('').slice(0, 16);
        }

        async function deriveKey(password, salt) {
            const encoder = new TextEncoder();
            const keyMaterial = await crypto.subtle.importKey(
                'raw',
                encoder.encode(password),
                { name: 'PBKDF2' },
                false,
                ['deriveKey']
            );
            return crypto.subtle.deriveKey(
                {
                    name: 'PBKDF2',
                    salt: salt,
                    iterations: PBKDF2_ITERATIONS,
                    hash: 'SHA-256'
                },
                keyMaterial,
                { name: 'AES-GCM', length: 256 },
                true,
                ['encrypt', 'decrypt']
            );
        }

        async function encrypt(text, key) {
            const encoder = new TextEncoder();
            const data = encoder.encode(text);
            const iv = crypto.getRandomValues(new Uint8Array(12));
            
            const encryptedContent = await crypto.subtle.encrypt(
                { name: 'AES-GCM', iv: iv },
                key,
                data
            );
            
            const combined = new Uint8Array(iv.length + encryptedContent.byteLength);
            combined.set(iv);
            combined.set(new Uint8Array(encryptedContent), iv.length);
            
            return btoa(String.fromCharCode.apply(null, combined));
        }

        async function decrypt(encryptedBase64, key) {
            try {
                const combined = Uint8Array.from(atob(encryptedBase64), c => c.charCodeAt(0));
                const iv = combined.slice(0, 12);
                const encryptedContent = combined.slice(12);

                const decrypted = await crypto.subtle.decrypt(
                    { name: 'AES-GCM', iv: iv },
                    key,
                    encryptedContent
                );
                
                return new TextDecoder().decode(decrypted);
            } catch (error) {
                console.error('Decryption failed:', error);
                throw new Error('Decryption failed. Check password.');
            }
        }
        
        function base64ToUint8Array(base64) {
            const binaryString = atob(base64);
            const len = binaryString.length;
            const bytes = new Uint8Array(len);
            for (let i = 0; i < len; i++) {
                bytes[i] = binaryString.charCodeAt(i);
            }
            return bytes;
        }

        // --- APPLICATION LOGIC ---
        document.getElementById('passwordInput').focus();
        document.getElementById('passwordInput').addEventListener('keypress', e => {
            if (e.key === 'Enter') login();
        });

        // iOS Safari viewport fix
        function fixIOSViewport() {
            const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
            if (isIOS) {
                const vh = window.innerHeight * 0.01;
                document.documentElement.style.setProperty('--vh', `${vh}px`);
                
                window.addEventListener('resize', () => {
                    const vh = window.innerHeight * 0.01;
                    document.documentElement.style.setProperty('--vh', `${vh}px`);
                });
            }
        }

        // Call on page load
        fixIOSViewport();

        async function login() {
            if (isWorking) return;
            isWorking = true;
            
            const password = document.getElementById('passwordInput').value;
            const errorDiv = document.getElementById('loginError');
            const enterBtn = document.querySelector('.enter-btn');
            
            errorDiv.textContent = '';
            if (password.length < 8) {
                errorDiv.textContent = 'Password must be at least 8 characters';
                isWorking = false;
                return;
            }
            
            enterBtn.textContent = 'Loading...';
            enterBtn.disabled = true;

            currentPassword = password;
            fileHash = await generateFilenameHash(password);
            
            try {
                const response = await fetch('/api/load', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ hash: fileHash })
                });
                
                const data = await response.json();
                
                if (!response.ok) {
                    throw new Error(data.error || 'Login failed');
                }
                
                currentSalt = base64ToUint8Array(data.salt);
                
                let content = '';
                if (data.content) {
                    const key = await deriveKey(currentPassword, currentSalt);
                    content = await decrypt(data.content, key);
                }
                
                document.getElementById('editor').value = content;
                document.getElementById('loginScreen').style.display = 'none';
                document.getElementById('editorScreen').style.display = 'flex';
                //let editor = document.getElementById('editor')
                //editor.focus();
                //editor.setSelectionRange(0, 0);
                setupAutoSave();
                updateSaveStatus('Ready');
                updateWordCount();

            } catch (error) {
                errorDiv.textContent = error.message.includes('Decryption') ? 'Invalid password' : 'Connection error';
            } finally {
                isWorking = false;
                enterBtn.textContent = 'Enter';
                enterBtn.disabled = false;
            }
        }

        function setupAutoSave() {
            const editor = document.getElementById('editor');
            
            editor.addEventListener('input', () => {
                clearTimeout(saveTimeout);
                updateSaveStatus('Typing...');
                updateWordCount();
                
                saveTimeout = setTimeout(saveContent, 1500);
            });
        }

        async function saveContent() {
            if (isWorking) return;
            isWorking = true;
            
            updateSaveStatus('Saving...');
            
            const content = document.getElementById('editor').value;
            
            try {
                const key = await deriveKey(currentPassword, currentSalt);
                const encryptedContent = await encrypt(content, key);
                
                const response = await fetch('/api/save', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ 
                        hash: fileHash,
                        content: encryptedContent 
                    })
                });
                
                if (response.ok) {
                    updateSaveStatus('Saved');
                } else {
                    const data = await response.json();
                    updateSaveStatus(`Error: ${data.error || 'Save failed'}`);
                }
            } catch (error) {
                console.error('Save failed:', error);
                updateSaveStatus('Save failed');
            } finally {
                isWorking = false;
            }
        }

        function updateSaveStatus(status) {
            const statusDiv = document.getElementById('saveStatus');
            statusDiv.textContent = status;
            
            statusDiv.className = 'save-status';
            if (status.includes('Saving') || status.includes('Typing')) {
                statusDiv.className += ' saving';
            } else if (status === 'Saved') {
                statusDiv.className += ' saved';
            }
        }

        // Prevent accidental page close
        window.addEventListener('beforeunload', function(e) {
            const statusDiv = document.getElementById('saveStatus');
            if (statusDiv.className.includes(" saving")) {
                e.preventDefault();
                e.returnValue = '';
            }
        });
    </script>
</body>
</html>