trng-client/main.py

import os
import os.path
import sys
import time
import queue
import argparse
import tempfile
import threading
from itertools import groupby

import cv2
import requests
from loguru import logger
from Crypto.Hash import BLAKE2b

try:
    import rdrand
except ImportError:
    logger.warning("RdRand is not available.")

try:
    from linuxpy.video.device import Device, VideoCapture
except ImportError:
    logger.warning("linuxpy is not available.")

tmp_dir = None
push_timeout = 10


class TemporaryFile:
    def __init__(self, name, io, delete):
        self.name = name
        self.__io = io
        self.__delete = delete

    def __getattr__(self, k):
        return getattr(self.__io, k)

    def __del__(self):
        if self.__delete:
            try:
                os.unlink(self.name)
            except FileNotFoundError:
                pass


def NamedTemporaryFile(
    mode="w+b", bufsize=-1, suffix="", prefix="tmp", dir=None, delete=True
):
    if not dir:
        dir = tempfile.gettempdir()

    name = os.path.join(dir, prefix + os.urandom(32).hex() + suffix)

    if mode is None:
        return TemporaryFile(name, None, delete)

    fh = open(name, "w+b", bufsize)
    if mode != "w+b":
        fh.close()
        fh = open(name, mode)

    return TemporaryFile(name, fh, delete)


def chunks(lst, n):
    for i in range(0, len(lst), n):
        yield lst[i : i + n]


def run_check(cmd):
    logger.info(f"Executing '{cmd}'.")

    if os.system(cmd) != 0:
        raise ValueError("Exit code != 0.")


def extract_image(path):
    logger.info(f"Extract image '{path}'.")

    im = cv2.imread(path)

    data = []
    rows, cols, _ = im.shape
    for i in range(rows):
        for j in range(cols):
            r, g, b = im[i, j]

            byte = 0
            byte |= 1 << (r & 1)
            byte |= 1 << ((r >> 1) & 1)
            byte |= 1 << ((g >> 1) & 1)
            byte |= 1 << ((g >> 1) & 1)
            byte |= 1 << ((b >> 1) & 1)
            byte |= 1 << ((b >> 1) & 1)
            byte |= 1 << ((r >> 2) & 1)
            byte |= 1 << ((r >> 2) & 1)

            data.append(byte)

    return bytes(data)


def extract_wav(path):
    logger.info(f"Extract audio: '{path}'.")

    data = []

    with open(path, "rb") as f:
        for sample in chunks(f.read()[44:], 2):
            data.append(sample[0])

    return bytes(data)


def extract_video(path):
    logger.info(f"Extract video: '{path}'.")

    with tempfile.TemporaryDirectory(dir=tmp_dir) as tmpd:
        run_check(
            f"ffmpeg -hide_banner -loglevel error -y -i {path} -vf mpdecimate -r 1/1 {tmpd}/%d.bmp"
        )

        data = b""
        for filename in sorted(
            os.listdir(tmpd), key=lambda filename: int(filename.split(".")[0])
        ):
            data += extract_image(os.path.join(tmpd, filename))

        return data


def extract_lsbs(data):
    logger.info("Extract LSBs.")

    buffer = []

    data = chunks(data, 4)
    data = [k for k, _ in groupby(data)]
        
    for chunk in data:
        if len(chunk) != 4:
            break

        tmp_byte = 0
        for byte in chunk:
            for n in range(2):
                tmp_byte |= 1 << ((byte >> n) & 1)

        buffer.append(tmp_byte)

    return bytes(buffer)


def whiten(data):
    logger.info("Whitening.")

    buffer = b""
    for chunk in chunks(data, 256):
        if len(chunk) < 256:
            break

        buffer += BLAKE2b.new(data=chunk, digest_bits=256).digest()

    return buffer


def read_video(source, duration=60):
    tmpf = NamedTemporaryFile(suffix=".mkv", mode=None, dir=tmp_dir)

    run_check(
        f"ffmpeg -hide_banner -loglevel error -y -i {source} -t {duration} -acodec copy -vcodec copy {tmpf.name}"
    )

    return extract_video(tmpf.name)


def read_audio(source, duration=60):
    tmpf = NamedTemporaryFile(suffix=".wav", mode=None, dir=tmp_dir)

    run_check(
        f"ffmpeg -hide_banner -loglevel error -y -f alsa -i {source} -t {duration} -ar 44100 -f s16le -acodec pcm_s16le {tmpf.name}"
    )

    return extract_wav(tmpf.name)


def read_audio_video(source, duration=60):
    tmpf = NamedTemporaryFile(suffix=".mkv", mode=None, dir=tmp_dir)

    run_check(
        f"ffmpeg -hide_banner -loglevel error -y -i {source} -t {duration} -acodec copy -vcodec copy {tmpf.name}"
    )

    data_a = extract_video(tmpf.name)

    tmpf2 = NamedTemporaryFile(suffix=".wav", mode=None, dir=tmp_dir)

    run_check(
        f"ffmpeg -hide_banner -loglevel error -y -i {tmpf.name} -vn -ar 44100 -f s16le -acodec pcm_s16le {tmpf2.name}"
    )

    data_b = extract_wav(tmpf2.name)

    return bytes(a ^ b for a, b in zip(data_a, data_b))


def read_rdseed(_, amount=16):
    data = rdrand.rdseed_get_bytes(amount)
    if len(data) != amount or data.count(0) == amount:
        raise ValueError("bad data")

    return data


def sample(source, source_type, multiplier=1):
    match source_type:
        case "video":
            sampler = read_video
            multiplier *= 60

        case "audio":
            sampler = read_audio
            multiplier *= 60

        case "video+audio":
            sampler = read_audio_video
            multiplier *= 60

        case "rdseed":
            sampler = read_rdseed

        case _:
            raise ValueError(source_type)

    multiplier = int(multiplier)
    if multiplier < 1:
        raise ValueError(multiplier)

    logger.info("Sampling...")

    data = sampler(source, multiplier)

    logger.info(f"Sample ready: {len(data)}b.")

    if source_type != "rdseed":
        data = extract_lsbs(data)
        data = whiten(data)

    return data


def video2_sampler(q, source):
    with Device.from_id(abs(int(source))) as device:
        capture = VideoCapture(device)
        capture.set_format(
            device.info.frame_sizes[0].width, device.info.frame_sizes[0].height, "YUYV"
        )

        last = 0
        for frame in capture:
            new = time.monotonic()

            if new - last > 5:
                data = extract_lsbs(bytes(frame))
                data = whiten(data)

                logger.info(f"Sample ready: {len(data)}b.")

                q.put(data)

                last = new


def push(pool_url, data, secret):
    logger.info(f"Pushing {len(data)}b.")

    resp = requests.post(
        f"{pool_url}/api/pool",
        data=data,
        headers={"X-Secret": secret},
        timeout=(push_timeout, push_timeout),
    )

    (logger.success if resp.status_code == 200 else logger.error)(
        f"{resp.status_code}: {resp.text}"
    )


def puller(queue, source, source_type, multiplier):
    while True:
        try:
            data = sample(source, source_type, multiplier)
        except KeyboardInterrupt:
            logger.info("Interrupted by user.")

            sys.exit(0)
        except Exception as e:
            logger.error(f"Pull exception: {e}")

            continue

        for piece in chunks(data, 1024 * 500):
            queue.put(piece)


def pusher(queue, pool_url, secret, cooldown=0):
    while True:
        piece = queue.get()

        try:
            push(pool_url, piece, secret)
        except KeyboardInterrupt:
            logger.info("Interrupted by user.")

            sys.exit(0)
        except Exception as e:
            logger.error(f"Push exception: {e}")

            queue.put(piece)

        if cooldown:
            time.sleep(cooldown)


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--source", type=str, required=True)
    parser.add_argument("--source-type", type=str, default="video+audio")
    parser.add_argument("--multiplier", type=float, default=1)
    parser.add_argument("--secret-file", type=str, default="./.secret")
    parser.add_argument("--cooldown", type=int, default=0)
    parser.add_argument("--pool-url", type=str, default="https://yebi.su")
    parser.add_argument("--push-timeout", type=int, default=10)
    parser.add_argument("--tmp-dir", type=str)

    args = parser.parse_args()

    if args.tmp_dir and os.path.isdir(args.tmp_dir):
        tmp_dir = args.tmp_dir

        logger.info(f"Changed temp-dir: '{tmp_dir}'")

    push_timeout = max(args.push_timeout, 1)

    with open(args.secret_file, "r") as f:
        lines = f.read().strip().split("\n")
        ident = lines[0].strip()
        secret = lines[1].strip()

        secret = f"{ident} {secret}"

    q = queue.Queue()

    pusher_th = threading.Thread(
        target=pusher, args=(q, args.pool_url, secret, args.cooldown)
    )

    if args.source_type == "linuxvideo":
        threading.Thread(target=video2_sampler, args=(q, args.source)).start()
    else:
        threading.Thread(
            target=puller, args=(q, args.source, args.source_type, args.multiplier)
        ).start()

    pusher_th = threading.Thread(
        target=pusher, args=(q, args.pool_url, secret, args.cooldown)
    )
    pusher_th.start()
    pusher_th.join()