stream-api/backend/stream.py

#!/usr/bin/env python3
import json
import sys
import urllib.parse
import os
import time
import base64
import logging
import asyncio
import tornado.web
import tornado.routing
import aiohttp
import aiohttp_socks
import stream_providers
import expiringdict

logging.basicConfig(format='[%(filename)s:%(lineno)d] %(message)s', stream=sys.stdout, level=logging.INFO)
logger = logging.getLogger(__name__)

providers = {}
providers["nrk"] = "https://tv.nrk.no"
providers["svt"] = "https://svtplay.se"
providers["youtube"] = "https://www.youtube.com/watch?v="
providers["twitch"] = "https://twitch.tv"

nextcloud_server = os.environ.get("NEXTCLOUD_SERVER")
if nextcloud_server is not None:
    providers["nextcloud"] = nextcloud_server

playlist = None
icecast_server = os.environ.get("ICECAST_SERVER")
stream_server = os.environ.get("STREAM_SERVER")
proxy_server = os.environ.get("PROXY_SERVER")

ctype_cache = expiringdict.ExpiringDict(max_len=128, max_age_seconds=1800)
class ProxyElem():
    def __init__(self, proxy):
        self.proxy = proxy
    def local(self):
        timeout = aiohttp.ClientTimeout(total=5)
        return aiohttp.ClientSession(timeout=timeout)
    def session(self):
        connector = None
        if self.proxy is not None:
            connector = aiohttp_socks.ProxyConnector.from_url("socks5://" + self.proxy)
        timeout = aiohttp.ClientTimeout(total=2)
        return aiohttp.ClientSession(connector=connector, timeout=timeout)
    def __repr__(self):
        return str(self.proxy)
    async def proxy_url(self, urls):
        if not isinstance(proxy_server, str):
            return urls
        jdata = None
        data_list = []
        for url in urls:
            data = {}
            data["upstream"] = url
            data["proxy"] = self.proxy
            data["proxied"] = isinstance(self.proxy, str)
            data_list.append(data)
        try:
            async with self.local() as session:
                resp = await session.post(proxy_server, json=data_list)
                text = await resp.text()
                jdata = json.loads(text)
        except Exception as e:
            logger.info(e)
        if isinstance(jdata, list):
            ret_data = []
            for src, dst in zip(urls, jdata):
                if isinstance(src, str):
                    ret_data.append(dst)
                else:
                    ret_data.append(None)
            return ret_data
        else:
            return urls

class AsyncSessionData():
    def __init__(self, resp, current):
        self.resp = resp
        self.current = current
class AsyncSession():
    def __init__(self, resp, current):
        self.sdata = AsyncSessionData(resp, current)
    async def task(self):
        resp = await self.sdata.resp
        return AsyncSessionData(resp, self.sdata.current)

proxies = {}
for key in providers:
    proxies[key] = []
    current = []
    for i in range(0,9):
        proxy = os.environ.get(f'{key}_proxy{i}'.upper())
        if proxy is not None:
            current.append(proxy)
    if len(current) == 0:
        proxies[key].append(ProxyElem(None))
    else:
        for proxy in current:
            proxies[key].append(ProxyElem(proxy))

proxy_keys = []
for proxy_provider in proxies.values():
    for proxy in proxy_provider:
        if isinstance(proxy, ProxyElem) and isinstance(proxy.proxy, str):
            proxy_keys.append(proxy.proxy)
stream_providers.setup(proxy_keys)

class UpstreamHandler():
    def __init__(self):
        self.provider = None
        self.valid = False
        self.proxy = None
        self.upstream = None
    async def setup(self, handler):
        self.provider = handler.get_query_argument("provider", None)
        if self.provider in providers.keys():
            self.valid = True
            path = handler.request.path
            if self.provider == "nextcloud":
                path = path.removesuffix("/").removesuffix("download").removesuffix("/")
            elif self.provider == "youtube":
                path = path.removeprefix("/")
            src = providers[self.provider] + path
            proxy_list = proxies.get(self.provider)
            if isinstance(proxy_list, list):
                futures = []
                sessions = []
                for current in proxy_list:
                    session = current.session()
                    sessions.append(session)
                    future = AsyncSession(session.head(src), current)
                    task = asyncio.create_task(future.task())
                    futures.append(task)
                done = False
                for future in asyncio.as_completed(futures):
                    try:
                        result = await future
                        resp = result.resp
                    except Exception as e:
                        logger.info(e)
                    else:
                        done = True
                        new_url = str(resp.url)
                        if new_url.lower().startswith("https://consent.youtube.com"):
                            self.upstream = src
                        else:
                            self.upstream = new_url
                        self.proxy = result.current
                        break
                for future in futures:
                    if not future.done():
                        future.cancel()
                for session in sessions:
                    await session.close()

if icecast_server is not None and stream_server is not None:
    try:
        with open("/app/sources.json", "r") as f:
            data = json.loads(f.read())
            playlist = "#EXTM3U\n"
            for key in data:
                current = data[key]
                name = current["name"]
                radio = current["radio"]
                if radio:
                    playlist += f'#EXTINF:0 radio="true", {name}\n'
                    playlist += icecast_server + key + "\n"
                else:
                    playlist += f'#EXTINF:0 radio="false", {name}\n'
                    playlist += stream_server + key + "\n"
    except Exception as e:
        logger.info(e)

template_html = None
template_script = None
videojs_version = None
font_awesome_version = None
custom_style = None
favicon = None
try:
    with open("/app/index.html", "r") as f:
        template_html = tornado.template.Template(f.read().strip())
    with open("/app/script.js", "r") as f:
        template_script = tornado.template.Template(f.read().strip())
    with open("/app/version/video.js.txt", "r") as f:
        videojs_version = f.read().strip()
    with open("/app/version/chromecast.txt", "r") as f:
        chromecast_version = f.read().strip()
    with open("/app/version/font-awesome.txt", "r") as f:
        font_awesome_version = f.read().strip()
    with open("/app/favicon.png", "rb") as f:
        favicon = f.read()
    with open("/app/style.css", "r") as f:
        custom_style_raw = bytes(f.read().strip(), "utf-8")
        b64 = str(base64.b64encode(custom_style_raw), "ascii")
        custom_style = f'data:text/css;charset=utf-8;base64,{b64}'
except Exception as e:
    logger.info(e)

class MainHandler(tornado.web.RequestHandler):
    async def handle_any(self, redir):
        handler = UpstreamHandler()
        await handler.setup(self)
        if handler.valid:
            await self.handle_render(handler)
        else:
            logger.info(f'provider missing {self.request.uri}')
            self.set_status(404)
            self.write("Stream not found. (provider missing)")
    
    async def handle_render(self, handler):
        if template_script is not None and template_html is not None:
            provider_data = None
            if handler.provider == "nextcloud":
                provider_data = await stream_providers.get_nextcloud(handler.upstream, handler.proxy, logger)
            else:
                provider_data = await stream_providers.get_any(handler.upstream, handler.proxy, logger)
            proxied = await handler.proxy.proxy_url([provider_data.upstream(), provider_data.thumbnail()])

            video_info = {}
            video_info["upstream"] = proxied[0]
            video_info["poster"] = proxied[1]

            if isinstance(provider_data.ctype(), str):
                video_info["ctype"] = provider_data.ctype()
            else:
                try:
                    async with handler.proxy.local() as session:
                        resp = await session.head(proxied[0])
                        ctype = resp.headers.get("Content-Type", None)
                        if isinstance(ctype, str):
                            video_info["ctype"] = ctype
                except Exception as e:
                    logger.info(e)

            script = template_script.generate(info=json.dumps(video_info))
            b64 = str(base64.b64encode(script), "ascii")
            script_file = f'data:text/javascript;charset=utf-8;base64,{b64}'

            data["script"] = script_file
            data["videojs_version"] = videojs_version
            data["chromecast_version"] = chromecast_version
            data["font_awesome_version"] = font_awesome_version
            data["custom_style"] = custom_style
            rendered_html = template_html.generate(data=data, meta=provider_data.meta(), title=provider_data.title())
            self.write(rendered_html)
        else:
            self.set_status(404)
            self.write("HTML template missing.")

    async def get(self):
        await self.handle_any(True)
    async def head(self):
        await self.handle_any(False)

class FileHandler(tornado.web.RequestHandler):
    def get(self):
        self.set_header("Content-Type", "text/plain; charset=utf-8")
        self.write(playlist)
class IconHandler(tornado.web.RequestHandler):
    def get(self):
        self.set_header("Content-Type", "image/png")
        self.write(favicon)
try:
    handlers = []
    handlers.append((tornado.routing.PathMatches("/sources.m3u8"), FileHandler))
    handlers.append((tornado.routing.PathMatches("/favicon.ico"), IconHandler))
    handlers.append((tornado.routing.AnyMatches(), MainHandler))
    app_web = tornado.web.Application(handlers)
    app_web.listen(8080)
    tornado.ioloop.IOLoop.current().start()
except KeyboardInterrupt:
    print()