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#!/usr/bin/env python3
import argparse
from flask import Flask, render_template
from flask_socketio import SocketIO
import pty
import os
import subprocess
import select
import termios
import struct
import fcntl
import shlex
import logging
import sys
logging.getLogger("werkzeug").setLevel(logging.ERROR)
__version__ = "0.5.0.2"
app = Flask(__name__, template_folder=".", static_folder=".", static_url_path="")
app.config["SECRET_KEY"] = "secret!"
app.config["fd"] = None
app.config["child_pid"] = None
socketio = SocketIO(app)
def set_winsize(fd, row, col, xpix=0, ypix=0):
logging.debug("setting window size with termios")
winsize = struct.pack("HHHH", row, col, xpix, ypix)
fcntl.ioctl(fd, termios.TIOCSWINSZ, winsize)
def read_and_forward_pty_output():
max_read_bytes = 1024 * 20
while True:
socketio.sleep(0.01)
if app.config["fd"]:
timeout_sec = 0
(data_ready, _, _) = select.select([app.config["fd"]], [], [], timeout_sec)
if data_ready:
output = os.read(app.config["fd"], max_read_bytes).decode(
errors="ignore"
)
socketio.emit("pty-output", {"output": output}, namespace="/pty")
@app.route("/")
def index():
return render_template("index.html")
@socketio.on("pty-input", namespace="/pty")
def pty_input(data):
"""write to the child pty. The pty sees this as if you are typing in a real
terminal.
"""
if app.config["fd"]:
logging.debug("received input from browser: %s" % data["input"])
os.write(app.config["fd"], data["input"].encode())
@socketio.on("resize", namespace="/pty")
def resize(data):
if app.config["fd"]:
logging.debug(f"Resizing window to {data['rows']}x{data['cols']}")
set_winsize(app.config["fd"], data["rows"], data["cols"])
@socketio.on("connect", namespace="/pty")
def connect():
"""new client connected"""
logging.info("new client connected")
if app.config["child_pid"]:
# already started child process, don't start another
return
# create child process attached to a pty we can read from and write to
(child_pid, fd) = pty.fork()
if child_pid == 0:
# this is the child process fork.
# anything printed here will show up in the pty, including the output
# of this subprocess
subprocess.run(app.config["cmd"])
else:
# this is the parent process fork.
# store child fd and pid
app.config["fd"] = fd
app.config["child_pid"] = child_pid
set_winsize(fd, 50, 50)
cmd = " ".join(shlex.quote(c) for c in app.config["cmd"])
# logging/print statements must go after this because... I have no idea why
# but if they come before the background task never starts
socketio.start_background_task(target=read_and_forward_pty_output)
logging.info("child pid is " + child_pid)
logging.info(
f"starting background task with command `{cmd}` to continously read "
"and forward pty output to client"
)
logging.info("task started")
def main():
parser = argparse.ArgumentParser(
description=(
"A fully functional terminal in your browser. "
"https://github.com/cs01/pyxterm.js"
),
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument(
"-p", "--port", default=5000, help="port to run server on", type=int
)
parser.add_argument(
"--host",
default="127.0.0.1",
help="host to run server on (use 0.0.0.0 to allow access from other hosts)",
)
parser.add_argument("--debug", action="store_true", help="debug the server")
parser.add_argument("--version", action="store_true", help="print version and exit")
parser.add_argument(
"--command", default="bash", help="Command to run in the terminal"
)
parser.add_argument(
"--cmd-args",
default="",
help="arguments to pass to command (i.e. --cmd-args='arg1 arg2 --flag')",
)
args = parser.parse_args()
if args.version:
print(__version__)
exit(0)
app.config["cmd"] = [args.command] + shlex.split(args.cmd_args)
green = "\033[92m"
end = "\033[0m"
log_format = (
green
+ "pyxtermjs > "
+ end
+ "%(levelname)s (%(funcName)s:%(lineno)s) %(message)s"
)
logging.basicConfig(
format=log_format,
stream=sys.stdout,
level=logging.DEBUG if args.debug else logging.INFO,
)
logging.info(f"serving on http://{args.host}:{args.port}")
socketio.run(app, debug=args.debug, port=args.port, host=args.host)
if __name__ == "__main__":
main()
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