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stegasoo/frontends/web/app.py
Aaron D. Lee afa88bc73b Apply black formatter to all Python files 
Reformatted 29 files for consistent code style and CI compliance.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-02 17:44:41 -05:00

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#!/usr/bin/env python3
"""
Stegasoo Web Frontend (v4.0.0)
Flask-based web UI for steganography operations.
Supports both text messages and file embedding.
CHANGES in v4.0.0:
- Added channel key support for deployment/group isolation
- New /api/channel/status endpoint
- Channel key selector on encode/decode pages
- Messages encoded with channel key require same key to decode
CHANGES in v3.2.0:
- Removed date dependency from all operations
- Renamed day_phrase → passphrase
- No date selection or tracking needed
- Simplified user experience for asynchronous communications
NEW in v3.0: LSB and DCT embedding modes with advanced options.
NEW in v3.0.1: DCT output format selection (PNG or JPEG) and color mode (grayscale or color).
"""
import io
import mimetypes
import os
import secrets
import sys
import time
from pathlib import Path
from flask import Flask, flash, jsonify, redirect, render_template, request, send_file, url_for
from PIL import Image
os.environ["NUMPY_MADVISE_HUGEPAGE"] = "0"
os.environ["OMP_NUM_THREADS"] = "1"
# Add parent to path for development
sys.path.insert(0, str(Path(__file__).parent.parent.parent / "src"))
import stegasoo
from stegasoo import (
CapacityError,
DecryptionError,
FilePayload,
StegasooError,
export_rsa_key_pem,
generate_credentials,
generate_filename,
get_channel_status,
has_argon2,
# Channel key functions (v4.0.0)
has_dct_support,
load_rsa_key,
validate_channel_key,
validate_file_payload,
validate_image,
validate_message,
validate_passphrase,
validate_pin,
validate_rsa_key,
validate_security_factors,
)
from stegasoo.constants import (
DEFAULT_PASSPHRASE_WORDS,
MAX_FILE_PAYLOAD_SIZE,
MAX_FILE_SIZE,
MAX_MESSAGE_CHARS,
MAX_PIN_LENGTH,
MAX_UPLOAD_SIZE,
MIN_PASSPHRASE_WORDS,
MIN_PIN_LENGTH,
RECOMMENDED_PASSPHRASE_WORDS,
TEMP_FILE_EXPIRY,
TEMP_FILE_EXPIRY_MINUTES,
THUMBNAIL_QUALITY,
THUMBNAIL_SIZE,
VALID_RSA_SIZES,
__version__,
)
# QR Code support
try:
import qrcode # noqa: F401
from qrcode.constants import ERROR_CORRECT_L, ERROR_CORRECT_M # noqa: F401
HAS_QRCODE = True
except ImportError:
HAS_QRCODE = False
# QR Code reading
try:
from pyzbar.pyzbar import decode as pyzbar_decode # noqa: F401
HAS_QRCODE_READ = True
except ImportError:
HAS_QRCODE_READ = False
# Import QR utilities
# ============================================================================
# SUBPROCESS ISOLATION FOR STEGASOO OPERATIONS
# ============================================================================
# Runs encode/decode/compare in subprocesses to prevent jpegio/scipy crashes
# from taking down the Flask server.
from subprocess_stego import SubprocessStego
from stegasoo.qr_utils import (
can_fit_in_qr,
detect_and_crop_qr,
extract_key_from_qr,
generate_qr_code,
)
# Initialize subprocess wrapper (worker script must be in same directory)
subprocess_stego = SubprocessStego(timeout=180) # 3 minute timeout for large images
# ============================================================================
# FLASK APP CONFIGURATION
# ============================================================================
app = Flask(__name__)
app.secret_key = secrets.token_hex(32)
app.config["MAX_CONTENT_LENGTH"] = MAX_FILE_SIZE
# Temporary file storage for sharing (file_id -> {data, timestamp, filename})
TEMP_FILES: dict[str, dict] = {}
THUMBNAIL_FILES: dict[str, bytes] = {}
# ============================================================================
# TEMPLATE CONTEXT PROCESSOR
# ============================================================================
@app.context_processor
def inject_globals():
"""Inject global variables into all templates."""
# Get channel status (v4.0.0)
channel_status = get_channel_status()
return {
"version": __version__,
"max_message_chars": MAX_MESSAGE_CHARS,
"max_payload_kb": MAX_FILE_PAYLOAD_SIZE // 1024,
"max_upload_mb": MAX_UPLOAD_SIZE // (1024 * 1024),
"temp_file_expiry_minutes": TEMP_FILE_EXPIRY_MINUTES,
"min_pin_length": MIN_PIN_LENGTH,
"max_pin_length": MAX_PIN_LENGTH,
# NEW in v3.2.0
"min_passphrase_words": MIN_PASSPHRASE_WORDS,
"recommended_passphrase_words": RECOMMENDED_PASSPHRASE_WORDS,
"default_passphrase_words": DEFAULT_PASSPHRASE_WORDS,
# NEW in v3.0
"has_dct": has_dct_support(),
# NEW in v4.0.0 - Channel key status
"channel_mode": channel_status["mode"],
"channel_configured": channel_status["configured"],
"channel_fingerprint": channel_status.get("fingerprint"),
"channel_source": channel_status.get("source"),
}
# ============================================================================
# CONFIGURATION
# ============================================================================
try:
print(f"Stegasoo v{__version__} - Web Frontend")
print(f"Current MAX_FILE_SIZE: {MAX_FILE_SIZE}")
print(f"Current MAX_FILE_PAYLOAD_SIZE: {MAX_FILE_PAYLOAD_SIZE}")
print(f"DCT support: {has_dct_support()}")
print(f"QR code support: write={HAS_QRCODE}, read={HAS_QRCODE_READ}")
# Channel key status (v4.0.0)
channel_status = get_channel_status()
print(f"Channel key: {channel_status['mode']} mode")
if channel_status["configured"]:
print(f" Fingerprint: {channel_status.get('fingerprint')}")
print(f" Source: {channel_status.get('source')}")
DESIRED_PAYLOAD_SIZE = 2 * 1024 * 1024 # 2MB
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}")
# ============================================================================
# CHANNEL KEY HELPER (v4.0.0)
# ============================================================================
def resolve_channel_key_form(channel_key_value: str) -> str:
"""
Resolve channel key from form input.
Args:
channel_key_value: Form value ('auto', 'none', or explicit key)
Returns:
Value to pass to subprocess_stego ('auto', 'none', or explicit key)
"""
if not channel_key_value or channel_key_value == "auto":
return "auto"
elif channel_key_value == "none":
return "none"
else:
# Explicit key - validate format
if validate_channel_key(channel_key_value):
return channel_key_value
else:
# Invalid format, fall back to auto
return "auto"
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 (handle grayscale too)
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 == "L":
# Convert grayscale to RGB for thumbnail
img = img.convert("RGB")
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=THUMBNAIL_QUALITY, optimize=True)
return buffer.getvalue()
except Exception as e:
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")
# ============================================================================
# CHANNEL KEY API (v4.0.0)
# ============================================================================
@app.route("/api/channel/status")
def api_channel_status():
"""
Get current channel key status (v4.0.0).
Returns JSON with mode, fingerprint, and source.
"""
# Use subprocess for isolation
result = subprocess_stego.get_channel_status(reveal=False)
if result.success:
return jsonify(
{
"success": True,
"mode": result.mode,
"configured": result.configured,
"fingerprint": result.fingerprint,
"source": result.source,
}
)
else:
# Fallback to direct call if subprocess fails
status = get_channel_status()
return jsonify(
{
"success": True,
"mode": status["mode"],
"configured": status["configured"],
"fingerprint": status.get("fingerprint"),
"source": status.get("source"),
}
)
@app.route("/api/channel/validate", methods=["POST"])
def api_channel_validate():
"""
Validate a channel key format (v4.0.0).
Returns JSON with validation result.
"""
key = request.form.get("key", "") or request.json.get("key", "") if request.is_json else ""
if not key:
return jsonify({"valid": False, "error": "No key provided"})
is_valid = validate_channel_key(key)
if is_valid:
fingerprint = f"{key[:4]}-••••-••••-••••-••••-••••-••••-{key[-4:]}"
return jsonify(
{
"valid": True,
"fingerprint": fingerprint,
}
)
else:
return jsonify(
{
"valid": False,
"error": "Invalid format. Expected: XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX",
}
)
# ============================================================================
# GENERATE
# ============================================================================
@app.route("/generate", methods=["GET", "POST"])
def generate():
if request.method == "POST":
# v3.2.0: Changed from words_per_phrase to words_per_passphrase, default increased to 4
words_per_passphrase = int(
request.form.get("words_per_passphrase", DEFAULT_PASSPHRASE_WORDS)
)
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_passphrase = max(MIN_PASSPHRASE_WORDS, min(12, words_per_passphrase))
pin_length = max(MIN_PIN_LENGTH, min(MAX_PIN_LENGTH, pin_length))
if rsa_bits not in VALID_RSA_SIZES:
rsa_bits = 2048
try:
# v3.2.0 FIX: Use correct parameter name 'passphrase_words'
creds = generate_credentials(
use_pin=use_pin,
use_rsa=use_rsa,
pin_length=pin_length,
rsa_bits=rsa_bits,
passphrase_words=words_per_passphrase, # FIX: was words_per_passphrase=
)
# 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,
}
# v3.2.0: Single passphrase instead of daily phrases
return render_template(
"generate.html",
passphrase=creds.passphrase, # v3.2.0: Single passphrase
pin=creds.pin,
generated=True,
words_per_passphrase=words_per_passphrase,
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,
passphrase_entropy=creds.passphrase_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("/qr/crop", methods=["POST"])
def qr_crop():
"""
Detect and crop QR code from an image.
Useful for extracting QR codes from photos taken at an angle,
with extra background, etc. Returns the cropped QR as PNG.
"""
if not HAS_QRCODE_READ:
return jsonify({"error": "QR code reading not available (install pyzbar)"}), 501
image_file = request.files.get("image")
if not image_file:
return jsonify({"error": "No image provided"}), 400
try:
image_data = image_file.read()
# Use the new crop function
cropped = detect_and_crop_qr(image_data)
if cropped is None:
return jsonify({"error": "No QR code detected in image"}), 404
# Return as downloadable PNG or inline based on query param
as_attachment = request.args.get("download", "").lower() in ("1", "true", "yes")
return send_file(
io.BytesIO(cropped),
mimetype="image/png",
as_attachment=as_attachment,
download_name="cropped_qr.png",
)
except Exception as e:
return jsonify({"error": f"Error processing image: {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
# ============================================================================
# NEW in v3.0 - CAPACITY COMPARISON API
# ============================================================================
@app.route("/api/compare-capacity", methods=["POST"])
def api_compare_capacity():
"""
Compare LSB and DCT capacity for an uploaded carrier image.
Returns JSON with capacity info for both modes.
Uses subprocess isolation to prevent crashes.
"""
carrier = request.files.get("carrier")
if not carrier:
return jsonify({"error": "No carrier image provided"}), 400
try:
carrier_data = carrier.read()
# Use subprocess-isolated compare_modes
result = subprocess_stego.compare_modes(carrier_data)
if not result.success:
return jsonify({"error": result.error or "Comparison failed"}), 500
return jsonify(
{
"success": True,
"width": result.width,
"height": result.height,
"lsb": {
"capacity_bytes": result.lsb["capacity_bytes"],
"capacity_kb": round(result.lsb["capacity_kb"], 1),
"output": result.lsb.get("output", "PNG"),
},
"dct": {
"capacity_bytes": result.dct["capacity_bytes"],
"capacity_kb": round(result.dct["capacity_kb"], 1),
"output": result.dct.get("output", "JPEG"),
"available": result.dct.get("available", True),
"ratio": round(result.dct.get("ratio_vs_lsb", 0), 1),
},
}
)
except Exception as e:
return jsonify({"error": str(e)}), 500
@app.route("/api/check-fit", methods=["POST"])
def api_check_fit():
"""
Check if a payload will fit in the carrier with selected mode.
Returns JSON with fit status and details.
Uses subprocess isolation to prevent crashes.
"""
carrier = request.files.get("carrier")
payload_size = request.form.get("payload_size", type=int)
embed_mode = request.form.get("embed_mode", "lsb")
if not carrier or payload_size is None:
return jsonify({"error": "Missing carrier or payload_size"}), 400
if embed_mode not in ("lsb", "dct"):
return jsonify({"error": "Invalid embed_mode"}), 400
if embed_mode == "dct" and not has_dct_support():
return jsonify({"error": "DCT mode requires scipy"}), 400
try:
carrier_data = carrier.read()
# Use subprocess-isolated capacity check
result = subprocess_stego.check_capacity(
carrier_data=carrier_data,
payload_size=payload_size,
embed_mode=embed_mode,
)
if not result.success:
return jsonify({"error": result.error or "Capacity check failed"}), 500
return jsonify(
{
"success": True,
"fits": result.fits,
"payload_size": result.payload_size,
"capacity": result.capacity,
"usage_percent": round(result.usage_percent, 1),
"headroom": result.headroom,
"mode": result.mode,
}
)
except Exception as e:
return jsonify({"error": str(e)}), 500
# ============================================================================
# ENCODE
# ============================================================================
@app.route("/encode", methods=["GET", "POST"])
def encode_page():
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", 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", has_qrcode_read=HAS_QRCODE_READ)
# Get form data - v3.2.0: renamed from day_phrase to passphrase
message = request.form.get("message", "")
passphrase = request.form.get("passphrase", "") # v3.2.0: Renamed
pin = request.form.get("pin", "").strip()
rsa_password = request.form.get("rsa_password", "")
payload_type = request.form.get("payload_type", "text")
# NEW in v3.0 - Embedding mode
embed_mode = request.form.get("embed_mode", "lsb")
if embed_mode not in ("lsb", "dct"):
embed_mode = "lsb"
# NEW in v3.0.1 - DCT output format
dct_output_format = request.form.get("dct_output_format", "png")
if dct_output_format not in ("png", "jpeg"):
dct_output_format = "png"
# NEW in v3.0.1 - DCT color mode
dct_color_mode = request.form.get("dct_color_mode", "color")
if dct_color_mode not in ("grayscale", "color"):
dct_color_mode = "color"
# NEW in v4.0.0 - Channel key
channel_key = resolve_channel_key_form(request.form.get("channel_key", "auto"))
# Check DCT availability
if embed_mode == "dct" and not has_dct_support():
flash("DCT mode requires scipy. Install with: pip install scipy", "error")
return render_template("encode.html", has_qrcode_read=HAS_QRCODE_READ)
# 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", 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", has_qrcode_read=HAS_QRCODE_READ)
payload = message
# v3.2.0: Renamed from day_phrase
if not passphrase:
flash("Passphrase is required", "error")
return render_template("encode.html", has_qrcode_read=HAS_QRCODE_READ)
# v3.2.0: Validate passphrase
result = validate_passphrase(passphrase)
if not result.is_valid:
flash(result.error_message, "error")
return render_template("encode.html", has_qrcode_read=HAS_QRCODE_READ)
# Show warning if passphrase is short
if result.warning:
flash(result.warning, "warning")
# 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
if rsa_key_file and rsa_key_file.filename:
rsa_key_data = rsa_key_file.read()
elif rsa_key_qr and rsa_key_qr.filename and HAS_QRCODE_READ:
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
else:
flash("Could not extract RSA key from QR code image.", "error")
return render_template("encode.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("encode.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("encode.html", has_qrcode_read=HAS_QRCODE_READ)
# Determine key password
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", 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", has_qrcode_read=HAS_QRCODE_READ)
# v4.0.0: Include channel_key parameter
# Use subprocess-isolated encode to prevent crashes
if payload_type == "file" and payload_file and payload_file.filename:
encode_result = subprocess_stego.encode(
carrier_data=carrier_data,
reference_data=ref_data,
file_data=payload.data,
file_name=payload.filename,
file_mime=payload.mime_type,
passphrase=passphrase,
pin=pin if pin else None,
rsa_key_data=rsa_key_data,
rsa_password=key_password,
embed_mode=embed_mode,
dct_output_format=dct_output_format if embed_mode == "dct" else "png",
dct_color_mode=dct_color_mode if embed_mode == "dct" else "color",
channel_key=channel_key, # v4.0.0
)
else:
encode_result = subprocess_stego.encode(
carrier_data=carrier_data,
reference_data=ref_data,
message=payload,
passphrase=passphrase,
pin=pin if pin else None,
rsa_key_data=rsa_key_data,
rsa_password=key_password,
embed_mode=embed_mode,
dct_output_format=dct_output_format if embed_mode == "dct" else "png",
dct_color_mode=dct_color_mode if embed_mode == "dct" else "color",
channel_key=channel_key, # v4.0.0
)
# Check for subprocess errors
if not encode_result.success:
error_msg = encode_result.error or "Encoding failed"
if "capacity" in error_msg.lower():
raise CapacityError(error_msg)
raise StegasooError(error_msg)
# Determine actual output format for filename and storage
if embed_mode == "dct" and dct_output_format == "jpeg":
output_ext = ".jpg"
output_mime = "image/jpeg"
else:
output_ext = ".png"
output_mime = "image/png"
# Use filename from result or generate one
filename = encode_result.filename
if not filename:
filename = generate_filename("stego", output_ext)
elif embed_mode == "dct" and dct_output_format == "jpeg" and filename.endswith(".png"):
filename = filename[:-4] + ".jpg"
# Store temporarily
file_id = secrets.token_urlsafe(16)
cleanup_temp_files()
TEMP_FILES[file_id] = {
"data": encode_result.stego_data,
"filename": filename,
"timestamp": time.time(),
"embed_mode": embed_mode,
"output_format": dct_output_format if embed_mode == "dct" else "png",
"color_mode": dct_color_mode if embed_mode == "dct" else None,
"mime_type": output_mime,
# Channel info (v4.0.0)
"channel_mode": encode_result.channel_mode,
"channel_fingerprint": encode_result.channel_fingerprint,
}
return redirect(url_for("encode_result", file_id=file_id))
except CapacityError as e:
flash(str(e), "error")
return render_template("encode.html", has_qrcode_read=HAS_QRCODE_READ)
except StegasooError as e:
flash(str(e), "error")
return render_template("encode.html", has_qrcode_read=HAS_QRCODE_READ)
except Exception as e:
flash(f"Error: {e}", "error")
return render_template("encode.html", has_qrcode_read=HAS_QRCODE_READ)
return render_template("encode.html", 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,
embed_mode=file_info.get("embed_mode", "lsb"),
output_format=file_info.get("output_format", "png"),
color_mode=file_info.get("color_mode"),
# Channel info (v4.0.0)
channel_mode=file_info.get("channel_mode", "public"),
channel_fingerprint=file_info.get("channel_fingerprint"),
)
@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]
mime_type = file_info.get("mime_type", "image/png")
return send_file(
io.BytesIO(file_info["data"]),
mimetype=mime_type,
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]
mime_type = file_info.get("mime_type", "image/png")
return send_file(
io.BytesIO(file_info["data"]),
mimetype=mime_type,
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"})
# ============================================================================
# DECODE
# ============================================================================
@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 - v3.2.0: renamed from day_phrase to passphrase
passphrase = request.form.get("passphrase", "") # v3.2.0: Renamed
pin = request.form.get("pin", "").strip()
rsa_password = request.form.get("rsa_password", "")
# NEW in v3.0 - Extraction mode
embed_mode = request.form.get("embed_mode", "auto")
if embed_mode not in ("auto", "lsb", "dct"):
embed_mode = "auto"
# NEW in v4.0.0 - Channel key
channel_key = resolve_channel_key_form(request.form.get("channel_key", "auto"))
# Check DCT availability
if embed_mode == "dct" and not has_dct_support():
flash("DCT mode requires scipy. Install with: pip install scipy", "error")
return render_template("decode.html", has_qrcode_read=HAS_QRCODE_READ)
# v3.2.0: Removed date handling (no stego_date needed)
# v3.2.0: Renamed from day_phrase
if not passphrase:
flash("Passphrase 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
if rsa_key_file and rsa_key_file.filename:
rsa_key_data = rsa_key_file.read()
elif rsa_key_qr and rsa_key_qr.filename and HAS_QRCODE_READ:
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
else:
flash("Could not extract RSA key from QR code image.", "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
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)
# v4.0.0: Include channel_key parameter
# Use subprocess-isolated decode to prevent crashes
decode_result = subprocess_stego.decode(
stego_data=stego_data,
reference_data=ref_data,
passphrase=passphrase,
pin=pin if pin else None,
rsa_key_data=rsa_key_data,
rsa_password=key_password,
embed_mode=embed_mode,
channel_key=channel_key, # v4.0.0
)
# Check for subprocess errors
if not decode_result.success:
error_msg = decode_result.error or "Decoding failed"
# Check for channel key related errors
if "channel key" in error_msg.lower():
flash(error_msg, "error")
return render_template("decode.html", has_qrcode_read=HAS_QRCODE_READ)
if "decrypt" in error_msg.lower() or decode_result.error_type == "DecryptionError":
raise DecryptionError(error_msg)
raise StegasooError(error_msg)
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,
has_qrcode_read=HAS_QRCODE_READ,
)
else:
# Text content
return render_template(
"decode.html",
decoded_message=decode_result.message,
has_qrcode_read=HAS_QRCODE_READ,
)
except DecryptionError:
flash(
"Decryption failed. Check your passphrase, PIN, RSA key, reference photo, and channel key.",
"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)
# Add these two test routes anywhere in app.py after the app = Flask(...) line:
@app.route("/test-capacity", methods=["POST"])
def test_capacity():
"""Minimal capacity test - no stegasoo code, just PIL."""
carrier = request.files.get("carrier")
if not carrier:
return jsonify({"error": "No carrier image provided"}), 400
try:
carrier_data = carrier.read()
buffer = io.BytesIO(carrier_data)
img = Image.open(buffer)
width, height = img.size
fmt = img.format
img.close()
buffer.close()
pixels = width * height
lsb_bytes = (pixels * 3) // 8
dct_bytes = ((width // 8) * (height // 8) * 16) // 8 - 10
return jsonify(
{
"success": True,
"width": width,
"height": height,
"format": fmt,
"lsb_kb": round(lsb_bytes / 1024, 1),
"dct_kb": round(dct_bytes / 1024, 1),
}
)
except Exception as e:
return jsonify({"error": str(e)}), 500
@app.route("/test-capacity-nopil", methods=["POST"])
def test_capacity_nopil():
"""Ultra-minimal test - no PIL, no stegasoo."""
carrier = request.files.get("carrier")
if not carrier:
return jsonify({"error": "No carrier image provided"}), 400
carrier_data = carrier.read()
return jsonify(
{
"success": True,
"data_size": len(carrier_data),
}
)
# ============================================================================
# MAIN
# ============================================================================
if __name__ == "__main__":
app.run(host="0.0.0.0", port=5000, debug=False)
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