Fixing container disaster.

frontends/web/app.py

@@ -634,6 +634,9 @@ def decode_page():
             pin = request.form.get('pin', '').strip()
             rsa_password = request.form.get('rsa_password', '')
             
+            # Get encoding date from form (detected from filename in JS)
+            stego_date = request.form.get('stego_date', '').strip()
+            
             if not day_phrase:
                 flash('Day phrase is required', 'error')
                 return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
@@ -691,7 +694,8 @@ def decode_page():
                 day_phrase=day_phrase,
                 pin=pin,
                 rsa_key_data=rsa_key_data,
-                rsa_password=key_password
+                rsa_password=key_password,
+                date_str=stego_date if stego_date else None
             )
             
             if decode_result.is_file:

frontends/web/app.py.orig

@@ -0,0 +1,766 @@
+#!/usr/bin/env python3
+"""
+Stegasoo Web Frontend
+
+Flask-based web UI for steganography operations.
+Supports both text messages and file embedding.
+"""
+
+import io
+import sys
+import time
+import secrets
+import mimetypes
+from pathlib import Path
+from datetime import datetime
+from PIL import Image
+
+from flask import (
+    Flask, render_template, request, send_file,
+    jsonify, flash, redirect, url_for
+)
+
+# Add parent to path for development
+sys.path.insert(0, str(Path(__file__).parent.parent.parent / 'src'))
+
+import stegasoo
+from stegasoo import (
+    encode, decode, generate_credentials,
+    export_rsa_key_pem, load_rsa_key,
+    validate_pin, validate_message, validate_image,
+    validate_rsa_key, validate_security_factors,
+    validate_file_payload,
+    get_today_day, generate_filename,
+    DAY_NAMES, __version__,
+    StegasooError, DecryptionError, CapacityError,
+    has_argon2,
+    FilePayload,
+    MAX_FILE_PAYLOAD_SIZE,
+)
+from stegasoo.constants import (
+    MAX_MESSAGE_SIZE, MIN_PIN_LENGTH, MAX_PIN_LENGTH,
+    VALID_RSA_SIZES, MAX_FILE_SIZE,
+)
+
+# QR Code support
+try:
+    import qrcode
+    from qrcode.constants import ERROR_CORRECT_L, ERROR_CORRECT_M
+    HAS_QRCODE = True
+except ImportError:
+    HAS_QRCODE = False
+
+# QR Code reading
+try:
+    from pyzbar.pyzbar import decode as pyzbar_decode
+    HAS_QRCODE_READ = True
+except ImportError:
+    HAS_QRCODE_READ = False
+
+import zlib
+import base64
+
+# Import QR utilities
+from stegasoo.qr_utils import (
+    compress_data, decompress_data, auto_decompress,
+    is_compressed, can_fit_in_qr, needs_compression,
+    generate_qr_code, read_qr_code, extract_key_from_qr,
+    has_qr_write, has_qr_read,
+    QR_MAX_BINARY, COMPRESSION_PREFIX
+)
+
+
+# ============================================================================
+# FLASK APP CONFIGURATION
+# ============================================================================
+
+app = Flask(__name__)
+app.secret_key = secrets.token_hex(32)
+app.config['MAX_CONTENT_LENGTH'] = MAX_FILE_SIZE  # 20MB max upload
+
+# Temporary file storage for sharing (file_id -> {data, timestamp, filename})
+TEMP_FILES: dict[str, dict] = {}
+THUMBNAIL_FILES: dict[str, bytes] = {}
+TEMP_FILE_EXPIRY = 300  # 5 minutes
+THUMBNAIL_SIZE = (250, 250)  # Maximum dimensions for thumbnail
+
+# ============================================================================
+# CONFIGURATION
+# ============================================================================
+
+# Override stegasoo limits for larger files
+# Note: You might need to modify the stegasoo library itself
+# to actually increase these limits in its internal calculations
+
+# Flask upload limit (30MB)
+MAX_UPLOAD_SIZE = 30 * 1024 * 1024
+
+# Try to import and override stegasoo constants if possible
+try:
+    # Check current limits
+    print(f"Current MAX_FILE_SIZE from constants: {MAX_FILE_SIZE}")
+    print(f"Current MAX_FILE_PAYLOAD_SIZE: {MAX_FILE_PAYLOAD_SIZE}")
+    
+    DESIRED_PAYLOAD_SIZE = 2 * 1024 * 1024  # 2MB
+    
+    # Note: You might need to patch the stegasoo module
+    # if MAX_FILE_PAYLOAD_SIZE is used internally
+    import stegasoo
+    if hasattr(stegasoo, 'MAX_FILE_PAYLOAD_SIZE'):
+        print(f"Overriding MAX_FILE_PAYLOAD_SIZE to {DESIRED_PAYLOAD_SIZE}")
+        stegasoo.MAX_FILE_PAYLOAD_SIZE = DESIRED_PAYLOAD_SIZE
+    
+except Exception as e:
+    print(f"Could not override stegasoo limits: {e}")
+
+def generate_thumbnail(image_data: bytes, size: tuple = THUMBNAIL_SIZE) -> bytes:
+    """Generate thumbnail from image data."""
+    try:
+        with Image.open(io.BytesIO(image_data)) as img:
+            # Convert to RGB if necessary
+            if img.mode in ('RGBA', 'LA', 'P'):
+                # Create white background for transparent images
+                background = Image.new('RGB', img.size, (255, 255, 255))
+                if img.mode == 'P':
+                    img = img.convert('RGBA')
+                background.paste(img, mask=img.split()[-1] if img.mode == 'RGBA' else None)
+                img = background
+            elif img.mode != 'RGB':
+                img = img.convert('RGB')
+            
+            # Create thumbnail
+            img.thumbnail(size, Image.Resampling.LANCZOS)
+            
+            # Save to bytes
+            buffer = io.BytesIO()
+            img.save(buffer, format='JPEG', quality=85, optimize=True)
+            return buffer.getvalue()
+    except Exception as e:
+        # Log error but don't crash
+        print(f"Thumbnail generation error: {e}")
+        return None
+
+
+def cleanup_temp_files():
+    """Remove expired temporary files."""
+    now = time.time()
+    expired = [fid for fid, info in TEMP_FILES.items() if now - info['timestamp'] > TEMP_FILE_EXPIRY]
+    
+    for fid in expired:
+        TEMP_FILES.pop(fid, None)
+        # Also clean up corresponding thumbnail
+        thumb_id = f"{fid}_thumb"
+        THUMBNAIL_FILES.pop(thumb_id, None)
+
+
+def allowed_image(filename: str) -> bool:
+    """Check if file has allowed image extension."""
+    if not filename or '.' not in filename:
+        return False
+    ext = filename.rsplit('.', 1)[1].lower()
+    return ext in {'png', 'jpg', 'jpeg', 'bmp', 'gif'}
+
+
+def format_size(size_bytes: int) -> str:
+    """Format file size for display."""
+    if size_bytes < 1024:
+        return f"{size_bytes} B"
+    elif size_bytes < 1024 * 1024:
+        return f"{size_bytes / 1024:.1f} KB"
+    else:
+        return f"{size_bytes / (1024 * 1024):.1f} MB"
+
+
+# ============================================================================
+# ROUTES
+# ============================================================================
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+
+@app.route('/generate', methods=['GET', 'POST'])
+def generate():
+    if request.method == 'POST':
+        words_per_phrase = int(request.form.get('words_per_phrase', 3))
+        use_pin = request.form.get('use_pin') == 'on'
+        use_rsa = request.form.get('use_rsa') == 'on'
+        
+        if not use_pin and not use_rsa:
+            flash('You must select at least one security factor (PIN or RSA Key)', 'error')
+            return render_template('generate.html', generated=False, has_qrcode=HAS_QRCODE)
+        
+        pin_length = int(request.form.get('pin_length', 6))
+        rsa_bits = int(request.form.get('rsa_bits', 2048))
+        
+        # Clamp values
+        words_per_phrase = max(3, min(12, words_per_phrase))
+        pin_length = max(MIN_PIN_LENGTH, min(MAX_PIN_LENGTH, pin_length))
+        if rsa_bits not in VALID_RSA_SIZES:
+            rsa_bits = 2048
+        
+        try:
+            creds = generate_credentials(
+                use_pin=use_pin,
+                use_rsa=use_rsa,
+                pin_length=pin_length,
+                rsa_bits=rsa_bits,
+                words_per_phrase=words_per_phrase
+            )
+            
+            # Store RSA key temporarily for QR generation
+            qr_token = None
+            qr_needs_compression = False
+            qr_too_large = False
+            
+            if creds.rsa_key_pem and HAS_QRCODE:
+                # Check if key fits in QR code
+                if can_fit_in_qr(creds.rsa_key_pem, compress=True):
+                    qr_needs_compression = True
+                else:
+                    qr_too_large = True
+                
+                if not qr_too_large:
+                    qr_token = secrets.token_urlsafe(16)
+                    cleanup_temp_files()
+                    TEMP_FILES[qr_token] = {
+                        'data': creds.rsa_key_pem.encode(),
+                        'filename': 'rsa_key.pem',
+                        'timestamp': time.time(),
+                        'type': 'rsa_key',
+                        'compress': qr_needs_compression
+                    }
+            
+            return render_template('generate.html',
+                phrases=creds.phrases,
+                pin=creds.pin,
+                days=DAY_NAMES,
+                generated=True,
+                words_per_phrase=words_per_phrase,
+                pin_length=pin_length if use_pin else None,
+                use_pin=use_pin,
+                use_rsa=use_rsa,
+                rsa_bits=rsa_bits,
+                rsa_key_pem=creds.rsa_key_pem,
+                phrase_entropy=creds.phrase_entropy,
+                pin_entropy=creds.pin_entropy,
+                rsa_entropy=creds.rsa_entropy,
+                total_entropy=creds.total_entropy,
+                has_qrcode=HAS_QRCODE,
+                qr_token=qr_token,
+                qr_needs_compression=qr_needs_compression,
+                qr_too_large=qr_too_large
+            )
+        except Exception as e:
+            flash(f'Error generating credentials: {e}', 'error')
+            return render_template('generate.html', generated=False, has_qrcode=HAS_QRCODE)
+    
+    return render_template('generate.html', generated=False, has_qrcode=HAS_QRCODE)
+
+
+@app.route('/generate/qr/<token>')
+def generate_qr(token):
+    """Generate QR code for RSA key."""
+    if not HAS_QRCODE:
+        return "QR code support not available", 501
+    
+    if token not in TEMP_FILES:
+        return "Token expired or invalid", 404
+    
+    file_info = TEMP_FILES[token]
+    if file_info.get('type') != 'rsa_key':
+        return "Invalid token type", 400
+    
+    try:
+        key_pem = file_info['data'].decode('utf-8')
+        compress = file_info.get('compress', False)
+        qr_png = generate_qr_code(key_pem, compress=compress)
+        
+        return send_file(
+            io.BytesIO(qr_png),
+            mimetype='image/png',
+            as_attachment=False
+        )
+    except Exception as e:
+        return f"Error generating QR code: {e}", 500
+
+
+@app.route('/generate/qr-download/<token>')
+def generate_qr_download(token):
+    """Download QR code as PNG file."""
+    if not HAS_QRCODE:
+        return "QR code support not available", 501
+    
+    if token not in TEMP_FILES:
+        return "Token expired or invalid", 404
+    
+    file_info = TEMP_FILES[token]
+    if file_info.get('type') != 'rsa_key':
+        return "Invalid token type", 400
+    
+    try:
+        key_pem = file_info['data'].decode('utf-8')
+        compress = file_info.get('compress', False)
+        qr_png = generate_qr_code(key_pem, compress=compress)
+        
+        return send_file(
+            io.BytesIO(qr_png),
+            mimetype='image/png',
+            as_attachment=True,
+            download_name='stegasoo_rsa_key_qr.png'
+        )
+    except Exception as e:
+        return f"Error generating QR code: {e}", 500
+
+
+@app.route('/generate/download-key', methods=['POST'])
+def download_key():
+    """Download RSA key as password-protected PEM file."""
+    key_pem = request.form.get('key_pem', '')
+    password = request.form.get('key_password', '')
+
+    if not key_pem:
+        flash('No key to download', 'error')
+        return redirect(url_for('generate'))
+
+    if not password or len(password) < 8:
+        flash('Password must be at least 8 characters', 'error')
+        return redirect(url_for('generate'))
+
+    try:
+        private_key = load_rsa_key(key_pem.encode('utf-8'))
+        encrypted_pem = export_rsa_key_pem(private_key, password=password)
+
+        key_id = secrets.token_hex(4)
+        filename = f'stegasoo_key_{private_key.key_size}_{key_id}.pem'
+
+        return send_file(
+            io.BytesIO(encrypted_pem),
+            mimetype='application/x-pem-file',
+            as_attachment=True,
+            download_name=filename
+        )
+    except Exception as e:
+        flash(f'Error creating key file: {e}', 'error')
+        return redirect(url_for('generate'))
+
+
+@app.route('/extract-key-from-qr', methods=['POST'])
+def extract_key_from_qr_route():
+    """
+    Extract RSA key from uploaded QR code image.
+    Returns JSON with the extracted key or error.
+    """
+    if not HAS_QRCODE_READ:
+        return jsonify({
+            'success': False,
+            'error': 'QR code reading not available. Install pyzbar and libzbar.'
+        }), 501
+    
+    qr_image = request.files.get('qr_image')
+    if not qr_image:
+        return jsonify({
+            'success': False,
+            'error': 'No QR image provided'
+        }), 400
+    
+    try:
+        image_data = qr_image.read()
+        key_pem = extract_key_from_qr(image_data)
+        
+        if key_pem:
+            return jsonify({
+                'success': True,
+                'key_pem': key_pem
+            })
+        else:
+            return jsonify({
+                'success': False,
+                'error': 'No valid RSA key found in QR code'
+            }), 400
+            
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+
+@app.route('/encode', methods=['GET', 'POST'])
+def encode_page():
+    day_of_week = get_today_day()
+    max_payload_kb = MAX_FILE_PAYLOAD_SIZE // 1024
+    
+    if request.method == 'POST':
+        try:
+            # Get files
+            ref_photo = request.files.get('reference_photo')
+            carrier = request.files.get('carrier')
+            rsa_key_file = request.files.get('rsa_key')
+            payload_file = request.files.get('payload_file')
+            
+            if not ref_photo or not carrier:
+                flash('Both reference photo and carrier image are required', 'error')
+                return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            if not allowed_image(ref_photo.filename) or not allowed_image(carrier.filename):
+                flash('Invalid file type. Use PNG, JPG, or BMP', 'error')
+                return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Get form data
+            message = request.form.get('message', '')
+            day_phrase = request.form.get('day_phrase', '')
+            pin = request.form.get('pin', '').strip()
+            rsa_password = request.form.get('rsa_password', '')
+            payload_type = request.form.get('payload_type', 'text')
+            
+            # Determine payload
+            if payload_type == 'file' and payload_file and payload_file.filename:
+                # File payload
+                file_data = payload_file.read()
+                
+                result = validate_file_payload(file_data, payload_file.filename)
+                if not result.is_valid:
+                    flash(result.error_message, 'error')
+                    return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+                
+                mime_type, _ = mimetypes.guess_type(payload_file.filename)
+                payload = FilePayload(
+                    data=file_data,
+                    filename=payload_file.filename,
+                    mime_type=mime_type
+                )
+            else:
+                # Text message
+                result = validate_message(message)
+                if not result.is_valid:
+                    flash(result.error_message, 'error')
+                    return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+                payload = message
+            
+            if not day_phrase:
+                flash('Day phrase is required', 'error')
+                return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Read files
+            ref_data = ref_photo.read()
+            carrier_data = carrier.read()
+            
+            # Handle RSA key - can come from .pem file or QR code image
+            rsa_key_data = None
+            rsa_key_qr = request.files.get('rsa_key_qr')
+            rsa_key_from_qr = False  # Track source for password handling
+            
+            if rsa_key_file and rsa_key_file.filename:
+                # RSA key from .pem file
+                rsa_key_data = rsa_key_file.read()
+            elif rsa_key_qr and rsa_key_qr.filename and HAS_QRCODE_READ:
+                # RSA key from QR code image
+                qr_image_data = rsa_key_qr.read()
+                key_pem = extract_key_from_qr(qr_image_data)
+                if key_pem:
+                    rsa_key_data = key_pem.encode('utf-8')
+                    rsa_key_from_qr = True  # QR keys are never password-protected
+                else:
+                    flash('Could not extract RSA key from QR code image. Make sure the image contains a valid QR code.', 'error')
+                    return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Validate security factors
+            result = validate_security_factors(pin, rsa_key_data)
+            if not result.is_valid:
+                flash(result.error_message, 'error')
+                return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Validate PIN if provided
+            if pin:
+                result = validate_pin(pin)
+                if not result.is_valid:
+                    flash(result.error_message, 'error')
+                    return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Determine key password - QR code keys are never password-protected
+            key_password = None if rsa_key_from_qr else (rsa_password if rsa_password else None)
+            
+            # Validate RSA key if provided
+            if rsa_key_data:
+                result = validate_rsa_key(rsa_key_data, key_password)
+                if not result.is_valid:
+                    flash(result.error_message, 'error')
+                    return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Validate carrier image
+            result = validate_image(carrier_data, "Carrier image")
+            if not result.is_valid:
+                flash(result.error_message, 'error')
+                return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Get date
+            client_date = request.form.get('client_date', '').strip()
+            if client_date and len(client_date) == 10 and client_date[4] == '-' and client_date[7] == '-':
+                date_str = client_date
+            else:
+                date_str = datetime.now().strftime('%Y-%m-%d')
+            
+            # Encode
+            encode_result = encode(
+                message=payload,
+                reference_photo=ref_data,
+                carrier_image=carrier_data,
+                day_phrase=day_phrase,
+                pin=pin,
+                rsa_key_data=rsa_key_data,
+                rsa_password=key_password,
+                date_str=date_str
+            )
+            
+            # Store temporarily
+            file_id = secrets.token_urlsafe(16)
+            cleanup_temp_files()
+            TEMP_FILES[file_id] = {
+                'data': encode_result.stego_image,
+                'filename': encode_result.filename,
+                'timestamp': time.time()
+            }
+            
+            return redirect(url_for('encode_result', file_id=file_id))
+            
+        except CapacityError as e:
+            flash(str(e), 'error')
+            return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+        except StegasooError as e:
+            flash(str(e), 'error')
+            return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+        except Exception as e:
+            flash(f'Error: {e}', 'error')
+            return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+    
+    return render_template('encode.html', day_of_week=day_of_week, max_payload_kb=max_payload_kb, has_qrcode_read=HAS_QRCODE_READ)
+
+
+@app.route('/encode/result/<file_id>')
+def encode_result(file_id):
+    if file_id not in TEMP_FILES:
+        flash('File expired or not found. Please encode again.', 'error')
+        return redirect(url_for('encode_page'))
+    
+    file_info = TEMP_FILES[file_id]
+    
+    # Generate thumbnail
+    thumbnail_data = generate_thumbnail(file_info['data'])
+    thumbnail_id = None
+    
+    if thumbnail_data:
+        thumbnail_id = f"{file_id}_thumb"
+        THUMBNAIL_FILES[thumbnail_id] = thumbnail_data
+    
+    return render_template('encode_result.html',
+        file_id=file_id,
+        filename=file_info['filename'],
+        thumbnail_url=url_for('encode_thumbnail', thumb_id=thumbnail_id) if thumbnail_id else None
+    )
+
+
+@app.route('/encode/thumbnail/<thumb_id>')
+def encode_thumbnail(thumb_id):
+    """Serve thumbnail image."""
+    if thumb_id not in THUMBNAIL_FILES:
+        return "Thumbnail not found", 404
+    
+    return send_file(
+        io.BytesIO(THUMBNAIL_FILES[thumb_id]),
+        mimetype='image/jpeg',
+        as_attachment=False
+    )
+
+
+@app.route('/encode/download/<file_id>')
+def encode_download(file_id):
+    if file_id not in TEMP_FILES:
+        flash('File expired or not found.', 'error')
+        return redirect(url_for('encode_page'))
+    
+    file_info = TEMP_FILES[file_id]
+    return send_file(
+        io.BytesIO(file_info['data']),
+        mimetype='image/png',
+        as_attachment=True,
+        download_name=file_info['filename']
+    )
+
+
+@app.route('/encode/file/<file_id>')
+def encode_file_route(file_id):
+    """Serve file for Web Share API."""
+    if file_id not in TEMP_FILES:
+        return "Not found", 404
+    
+    file_info = TEMP_FILES[file_id]
+    return send_file(
+        io.BytesIO(file_info['data']),
+        mimetype='image/png',
+        as_attachment=False,
+        download_name=file_info['filename']
+    )
+
+
+@app.route('/encode/cleanup/<file_id>', methods=['POST'])
+def encode_cleanup(file_id):
+    """Manually cleanup a file after sharing."""
+    TEMP_FILES.pop(file_id, None)
+    
+    # Also cleanup thumbnail if exists
+    thumb_id = f"{file_id}_thumb"
+    THUMBNAIL_FILES.pop(thumb_id, None)
+    
+    return jsonify({'status': 'ok'})
+
+
+@app.route('/decode', methods=['GET', 'POST'])
+def decode_page():
+    if request.method == 'POST':
+        try:
+            # Get files
+            ref_photo = request.files.get('reference_photo')
+            stego_image = request.files.get('stego_image')
+            rsa_key_file = request.files.get('rsa_key')
+            
+            if not ref_photo or not stego_image:
+                flash('Both reference photo and stego image are required', 'error')
+                return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Get form data
+            day_phrase = request.form.get('day_phrase', '')
+            pin = request.form.get('pin', '').strip()
+            rsa_password = request.form.get('rsa_password', '')
+            
+            if not day_phrase:
+                flash('Day phrase is required', 'error')
+                return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Read files
+            ref_data = ref_photo.read()
+            stego_data = stego_image.read()
+            
+            # Handle RSA key - can come from .pem file or QR code image
+            rsa_key_data = None
+            rsa_key_qr = request.files.get('rsa_key_qr')
+            rsa_key_from_qr = False  # Track source for password handling
+            
+            if rsa_key_file and rsa_key_file.filename:
+                # RSA key from .pem file
+                rsa_key_data = rsa_key_file.read()
+            elif rsa_key_qr and rsa_key_qr.filename and HAS_QRCODE_READ:
+                # RSA key from QR code image
+                qr_image_data = rsa_key_qr.read()
+                key_pem = extract_key_from_qr(qr_image_data)
+                if key_pem:
+                    rsa_key_data = key_pem.encode('utf-8')
+                    rsa_key_from_qr = True  # QR keys are never password-protected
+                else:
+                    flash('Could not extract RSA key from QR code image. Make sure the image contains a valid QR code.', 'error')
+                    return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Validate security factors
+            result = validate_security_factors(pin, rsa_key_data)
+            if not result.is_valid:
+                flash(result.error_message, 'error')
+                return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Validate PIN if provided
+            if pin:
+                result = validate_pin(pin)
+                if not result.is_valid:
+                    flash(result.error_message, 'error')
+                    return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Determine key password - QR code keys are never password-protected
+            key_password = None if rsa_key_from_qr else (rsa_password if rsa_password else None)
+            
+            # Validate RSA key if provided
+            if rsa_key_data:
+                result = validate_rsa_key(rsa_key_data, key_password)
+                if not result.is_valid:
+                    flash(result.error_message, 'error')
+                    return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+            
+            # Decode
+            decode_result = decode(
+                stego_image=stego_data,
+                reference_photo=ref_data,
+                day_phrase=day_phrase,
+                pin=pin,
+                rsa_key_data=rsa_key_data,
+                rsa_password=key_password
+            )
+            
+            if decode_result.is_file:
+                # File content - store temporarily for download
+                file_id = secrets.token_urlsafe(16)
+                cleanup_temp_files()
+                
+                filename = decode_result.filename or 'decoded_file'
+                TEMP_FILES[file_id] = {
+                    'data': decode_result.file_data,
+                    'filename': filename,
+                    'mime_type': decode_result.mime_type,
+                    'timestamp': time.time()
+                }
+                
+                return render_template('decode.html',
+                    decoded_file=True,
+                    file_id=file_id,
+                    filename=filename,
+                    file_size=format_size(len(decode_result.file_data)),
+                    mime_type=decode_result.mime_type
+                )
+            else:
+                # Text content
+                return render_template('decode.html', decoded_message=decode_result.message)
+            
+        except DecryptionError:
+            flash('Decryption failed. Check your phrase, PIN, RSA key, and reference photo.', 'error')
+            return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+        except StegasooError as e:
+            flash(str(e), 'error')
+            return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+        except Exception as e:
+            flash(f'Error: {e}', 'error')
+            return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+    
+    return render_template('decode.html', has_qrcode_read=HAS_QRCODE_READ)
+
+
+@app.route('/decode/download/<file_id>')
+def decode_download(file_id):
+    """Download decoded file."""
+    if file_id not in TEMP_FILES:
+        flash('File expired or not found.', 'error')
+        return redirect(url_for('decode_page'))
+    
+    file_info = TEMP_FILES[file_id]
+    mime_type = file_info.get('mime_type', 'application/octet-stream')
+    
+    return send_file(
+        io.BytesIO(file_info['data']),
+        mimetype=mime_type,
+        as_attachment=True,
+        download_name=file_info['filename']
+    )
+
+
+@app.route('/about')
+def about():
+    return render_template('about.html', 
+        has_argon2=has_argon2(),
+        has_qrcode_read=HAS_QRCODE_READ,
+        max_payload_kb=MAX_FILE_PAYLOAD_SIZE // 1024
+    )
+
+
+# ============================================================================
+# MAIN
+# ============================================================================
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5000, debug=False)

frontends/web/templates/decode.html

@@ -95,6 +95,9 @@
                         </div>
                     </div>
                     
+                    <!-- Hidden field for encoding date (auto-detected from filename) -->
+                    <input type="hidden" name="stego_date" id="stegoDate" value="">
+                    
                     <div class="mb-3">
                         <label class="form-label" id="dayPhraseLabel">
                             <i class="bi bi-chat-quote me-1"></i> Day Phrase
@@ -106,6 +109,12 @@
                         </div>
                     </div>
                     
+                    <!-- Date detection info -->
+                    <div class="alert alert-info small d-none" id="dateDetectedAlert">
+                        <i class="bi bi-calendar-check me-1"></i>
+                        <span id="dateDetectedText">Date detected from filename</span>
+                    </div>
+                    
                     <hr class="my-4">
                     
                     <h6 class="text-muted mb-3">
@@ -253,24 +262,52 @@ if (rsaKeyQrInput) {
 // Day names for date detection
 const dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
 
-// Detect day from filename
+// Detect day AND date from filename - FIXED VERSION
 function detectDayFromFilename(filename) {
-    const dateMatch = filename.match(/_(\d{4})[-]?(\d{2})[-]?(\d{2})/);
+    // Match patterns like _20251227 or _2025-12-27
+    const compactMatch = filename.match(/_(\d{4})(\d{2})(\d{2})/);
+    const dashedMatch = filename.match(/_(\d{4})-(\d{2})-(\d{2})/);
+    
+    const dateMatch = compactMatch || dashedMatch;
     
     if (dateMatch) {
         const [, year, month, day] = dateMatch;
-        const date = new Date(year, month - 1, day);
-        return dayNames[date.getDay()];
+        const date = new Date(parseInt(year), parseInt(month) - 1, parseInt(day));
+        const dayName = dayNames[date.getDay()];
+        // Return ISO format date string for the server
+        const dateStr = `${year}-${month.padStart(2, '0')}-${day.padStart(2, '0')}`;
+        
+        console.log('Detected date from filename:', dateStr, 'Day:', dayName);
+        
+        return {
+            dayName: dayName,
+            dateStr: dateStr
+        };
     }
     return null;
 }
 
-// Update day phrase label
-function updateDayLabel(dayName) {
+// Update day phrase label AND set hidden date field
+function updateDayLabel(dayName, dateStr) {
     const label = document.getElementById('dayPhraseLabel');
     if (label && dayName) {
         label.innerHTML = `<i class="bi bi-chat-quote me-1"></i>Provide <span class="day-of-week-highlight">${dayName}</span>'s Phrase`;
     }
+    
+    // CRITICAL FIX: Set the hidden date field for the server
+    const dateField = document.getElementById('stegoDate');
+    if (dateField && dateStr) {
+        dateField.value = dateStr;
+        console.log('Set stego_date hidden field to:', dateStr);
+    }
+    
+    // Show info alert about detected date
+    const dateAlert = document.getElementById('dateDetectedAlert');
+    const dateText = document.getElementById('dateDetectedText');
+    if (dateAlert && dateText && dateStr) {
+        dateText.textContent = `Encoding date detected: ${dateStr} (${dayName})`;
+        dateAlert.classList.remove('d-none');
+    }
 }
 
 // PIN Toggle
@@ -337,9 +374,12 @@ document.querySelectorAll('.drop-zone').forEach(zone => {
             const file = e.dataTransfer.files[0];
             showPreview(file);
             
+            // FIXED: Extract both day name AND date string
             if (isStegoZone) {
-                const dayName = detectDayFromFilename(file.name);
-                updateDayLabel(dayName);
+                const detected = detectDayFromFilename(file.name);
+                if (detected) {
+                    updateDayLabel(detected.dayName, detected.dateStr);
+                }
             }
         }
     });
@@ -349,9 +389,12 @@ document.querySelectorAll('.drop-zone').forEach(zone => {
             const file = this.files[0];
             showPreview(file);
             
+            // FIXED: Extract both day name AND date string
             if (isStegoZone) {
-                const dayName = detectDayFromFilename(file.name);
-                updateDayLabel(dayName);
+                const detected = detectDayFromFilename(file.name);
+                if (detected) {
+                    updateDayLabel(detected.dayName, detected.dateStr);
+                }
             }
         }
     });

patches/01_stegasoo_init_decode.patch

@@ -0,0 +1,61 @@
+--- a/src/stegasoo/__init__.py
++++ b/src/stegasoo/__init__.py
+@@ -189,6 +189,7 @@ def decode(
+     pin: str = "",
+     rsa_key_data: Optional[bytes] = None,
+     rsa_password: Optional[str] = None,
++    date_str: Optional[str] = None,
+ ) -> DecodeResult:
+     """
+     Decode a secret message or file from a stego image.
+@@ -201,6 +202,7 @@ def decode(
+         day_phrase: Passphrase for the day message was encoded
+         pin: Static PIN (if used during encoding)
+         rsa_key_data: RSA private key PEM bytes (if used during encoding)
+         rsa_password: Password for RSA key if encrypted
++        date_str: Date the message was encoded (YYYY-MM-DD). If not provided,
++                  tries today's date. Get this from the stego filename.
+         
+     Returns:
+@@ -221,8 +223,12 @@ def decode(
+     if rsa_key_data:
+         require_valid_rsa_key(rsa_key_data, rsa_password)
+     
+-    # Try to extract with today's date first
+-    date_str = date.today().isoformat()
++    # Use provided date or fall back to today
++    if date_str is None:
++        date_str = date.today().isoformat()
++        debug.print(f"No date provided, using today: {date_str}")
++    else:
++        debug.print(f"Using provided date: {date_str}")
++    
+     pixel_key = derive_pixel_key(
+         reference_photo, day_phrase, date_str, pin, rsa_key_data
+     )
+@@ -270,6 +276,7 @@ def decode_text(
+     pin: str = "",
+     rsa_key_data: Optional[bytes] = None,
+     rsa_password: Optional[str] = None,
++    date_str: Optional[str] = None,
+ ) -> str:
+     """
+     Decode a text message from a stego image.
+@@ -283,12 +290,13 @@ def decode_text(
+         day_phrase: Passphrase for the day message was encoded
+         pin: Static PIN (if used during encoding)
+         rsa_key_data: RSA private key PEM bytes (if used during encoding)
+         rsa_password: Password for RSA key if encrypted
++        date_str: Date the message was encoded (YYYY-MM-DD)
+         
+     Returns:
+         Decrypted message string
+         
+     Raises:
+         DecryptionError: If content is a binary file, not text
+     """
+     debug.print("decode_text called")
+-    result = decode(stego_image, reference_photo, day_phrase, pin, rsa_key_data, rsa_password)
++    result = decode(stego_image, reference_photo, day_phrase, pin, rsa_key_data, rsa_password, date_str)
+     
+     if result.is_file:

patches/02_decode_html_date_field.patch

@@ -0,0 +1,80 @@
+--- a/frontends/web/templates/decode.html
++++ b/frontends/web/templates/decode.html
+@@ -35,6 +35,9 @@
+                 {% else %}
+                 <!-- Decode Form -->
+                 <form method="POST" enctype="multipart/form-data" id="decodeForm">
++                    <!-- Hidden field for encoding date (detected from filename) -->
++                    <input type="hidden" name="stego_date" id="stegoDate" value="">
++                    
+                     <div class="row">
+                         <div class="col-md-6 mb-3">
+                             <label class="form-label">
+@@ -171,10 +174,20 @@ document.getElementById('togglePin')?.addEventListener('click', function() {
+ // Detect day from filename
+ function detectDayFromFilename(filename) {
+     const dateMatch = filename.match(/_(\d{4})[-]?(\d{2})[-]?(\d{2})/);
+-    
+     if (dateMatch) {
+         const [, year, month, day] = dateMatch;
+         const date = new Date(year, month - 1, day);
++        return {
++            dayName: dayNames[date.getDay()],
++            dateStr: `${year}-${month}-${day}`
++        };
++    }
++    return null;
++}
++
++// Legacy function for day name only
++function detectDayFromFilenameOld(filename) {
++    const result = detectDayFromFilename(filename);
++    if (result) {
+-        return dayNames[date.getDay()];
++        return result.dayName;
+     }
+     return null;
+ }
+@@ -182,8 +195,14 @@ function detectDayFromFilename(filename) {
+ // Update day phrase label
+-function updateDayLabel(dayName) {
++function updateDayLabel(dayName, dateStr) {
+     const label = document.getElementById('dayPhraseLabel');
+     if (label && dayName) {
+         label.innerHTML = `<i class="bi bi-chat-quote me-1"></i>Provide <span class="day-of-week-highlight">${dayName}</span>'s Phrase`;
+     }
++    
++    // Set the hidden date field
++    const dateField = document.getElementById('stegoDate');
++    if (dateField && dateStr) {
++        dateField.value = dateStr;
++        console.log('Set stego date to:', dateStr);
++    }
+ }
+ 
+@@ -232,8 +251,10 @@ document.querySelectorAll('.drop-zone').forEach(zone => {
+             showPreview(file);
+             
+             if (isStegoZone) {
+-                const dayName = detectDayFromFilename(file.name);
+-                updateDayLabel(dayName);
++                const detected = detectDayFromFilename(file.name);
++                if (detected) {
++                    updateDayLabel(detected.dayName, detected.dateStr);
++                }
+             }
+         }
+     });
+@@ -244,8 +265,10 @@ document.querySelectorAll('.drop-zone').forEach(zone => {
+             showPreview(file);
+             
+             if (isStegoZone) {
+-                const dayName = detectDayFromFilename(file.name);
+-                updateDayLabel(dayName);
++                const detected = detectDayFromFilename(file.name);
++                if (detected) {
++                    updateDayLabel(detected.dayName, detected.dateStr);
++                }
+             }
+         }
+     });

patches/03_app_py_decode_date.patch

@@ -0,0 +1,22 @@
+--- a/frontends/web/app.py
++++ b/frontends/web/app.py
+@@ -324,6 +324,9 @@ def decode_page():
+             day_phrase = request.form.get('day_phrase', '')
+             pin = request.form.get('pin', '').strip()
+             rsa_password = request.form.get('rsa_password', '')
++            
++            # Get encoding date from form (detected from filename in JS)
++            stego_date = request.form.get('stego_date', '').strip()
+             
+             if not day_phrase:
+                 flash('Day phrase is required', 'error')
+@@ -373,7 +376,8 @@ def decode_page():
+                 day_phrase=day_phrase,
+                 pin=pin,
+                 rsa_key_data=rsa_key_data,
+-                rsa_password=key_password
++                rsa_password=key_password,
++                date_str=stego_date if stego_date else None
+             )
+             
+             if decode_result.is_file: