web.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#  WebServer Module.
#   Use `web.run(host='127.0.0.1', port=8080)` to start
#

import re
import config, user
import bottle
import json, sys, os
import utils
import ssmgr
import traffic
import datetime
import pyqrcode, io, base64
from bottle import route, get, post, run, template, redirect, static_file, response, request
from functools import wraps

WEB_ROOT = config.WEB_ROOT
bottle.TEMPLATE_PATH.insert(0, WEB_ROOT)

# bottle.debug(True)

# FIXME: Use another graceful way to pass current_user to processors
current_user = user.User()
is_admin = False

# decorator that used for login_only pages
def require_login(func):
    def func_wrapper(*args, **kwargs):
        global current_user, is_admin
        uid_str = request.get_cookie('ssl_uid')
        password = request.get_cookie('ssl_pw')
        logined = uid_str and password
        if logined:
            current_user = user.get_by_id(int(uid_str))
            logined = current_user and current_user.salted_password == password
            is_admin = logined and current_user.id == config.USER_ADMIN
        if not logined:
            response.set_cookie('ssl_uid', '', expires=0)
            response.set_cookie('ssl_pw', '', expires=0)
            return redirect('/login')
        return func(*args, **kwargs)
    return func_wrapper

# decorator that used for user json APIs. Decorated function shall return a dict.
def json_api(func):
    def func_wrapper(*args, **kwargs):
        rs = func(*args, **kwargs)
        try:
            ds = json.dumps(rs)
            response.content_type = 'application/json; charset=utf-8'
            return ds
        except:
            return rs
    return func_wrapper
    
# decorator for admin APIs
def admin_api(uri):
    def admin_api_out(func):
        @wraps(func)
        @post(uri)
        @require_login
        @json_api
        def func_wrapper(*args, **kwargs):
            if not is_admin: return {"error": "not_admin"}
            return func(*args, **kwargs)
    return admin_api_out

# get salted password from request.forms
def get_salted_password():
    password = request.forms.get('password')
    if not (request.forms.get('md5ed') == '1' and re.match(r'^[a-f\d]{32}$', password)):
        password = user.salt_password(password)
    return password

# home panel Generator
get_home_content = lambda msg='': template(
    'home', 
    config=config, 
    user=current_user, 
    is_admin=is_admin, 
    message=msg,
    ssconf=ssmgr.conf_cache
)


# Website for normal User

@route('/')
@require_login
def server_index():
    ssmgr.read_conf()
    return get_home_content()
    
@route('/qr.svg')
@require_login
def server_qr():
    ssmgr.read_conf()
    qr = pyqrcode.create('ss://' + base64.b64encode('%s:%s@%s:%d'%(
        ssmgr.conf_cache['method'],
        current_user.sskey,
        ssmgr.conf_cache['server'],
        current_user.get_port()
    )))
    out = io.BytesIO()
    qr.svg(out, scale=5)
    response.content_type = 'image/svg+xml'
    return out.getvalue()

@post('/passwd')
@require_login
def set_passwd():
    u = current_user    
    u.salted_password = get_salted_password()
    u.write()
    return get_home_content("Password has changed.")

@post('/sskey')
@require_login
def set_sskey():
    u = current_user
    u.sskey = request.forms.get('sskey')
    u.write()
    
    import cron;
    cd = cron.start()
    if cd <= 0.5:
        msg = "Your Shadowsocks key is changed!"
    else:
        msg = "The Shadowsocks key will be changed in %.2f sec" % cd
    
    return get_home_content(msg)


# Website for Administrator

@route('/admin')
@require_login
def server_admin():
    if not is_admin:    return redirect('/')
    return static_file('admin.html', root=WEB_ROOT)

@admin_api('/admin/cli')
def admin_cli():
    argv = request.forms.get('cmd').split(' ')
    out, rtn = utils.get_stdout([sys.executable, './cli.py'] + argv)
    return {
        "retval": rtn,
        "output": out
    }

@admin_api('/admin/restart')
def admin_restart():
    import cron
    cd = cron.start()
    return { "time": cd }

@admin_api('/admin/basic')
def admin_basic():
    return { "user_salt": config.USER_SALT }

@admin_api('/admin/tx/query')
def admin_tx_query():
    tfrom, tto, tsum = [request.forms.get(n) or None for n in ('from', 'to', 'group')]
    # Make a UID->Username table
    un = { u.id: u.username for u in user.get_all() }
    # Make result 
    tresult = {}
    for uid, pkg, tx, time in traffic.query(min_time=tfrom, max_time=tto, sum=int(tsum)):
        if not time in tresult: tresult[time] = []
        tresult[time].append({ "title": un[uid], "amount": tx })
    tdays = tresult.keys()
    tdays.sort()
    return [ {"title": tday, "data": tresult[tday]} for tday in tdays ]

@admin_api('/admin/user/add')
def admin_user_add():
    u = user.User()
    u.username, u.salted_password, u.sskey = [request.forms.get(n) for n in ('username', 'password', 'sskey')]
    u.create()
    u.write()
    return { "id": u.id }

@admin_api('/admin/user/del')
def admin_user_del():
    username = request.forms.get('username')
    user.delete_users(username)
    return { "status": "ok" }

@admin_api('/admin/user/list')
def admin_user_list():
    list = []
    for u in user.get_all():
        ui = u.__dict__
        ui['port'] = u.get_port()
        list.append(ui)
    return { "list": list }

@admin_api('/admin/user/passwd')
def admin_user_passwd():
    username, password = [request.forms.get(n) for n in ('username', 'password')]
    u = user.get_by_username(username)
    u.salted_password = password
    u.write()
    return { "status": "ok" }

@admin_api('/admin/user/sskey')
def admin_user_sskey():
    username, sskey = [request.forms.get(n) for n in ('username', 'value')]
    u = user.get_by_username(username)
    u.sskey = sskey
    u.write()
    return { "status": "ok" }

@admin_api('/admin/user/port')
def admin_user_port():
    username, port = [request.forms.get(n) for n in ('username', 'value')]
    u = user.get_by_username(username)
    u.set_port(port)
    u.write()
    return { "status": "ok" }

@admin_api('/admin/user/limit')
def admin_user_limit():
    username, limit = [request.forms.get(n) for n in ('username', 'limit')]
    limit = json.loads(limit)
    u = user.get_by_username(username)
    u.set_meta("limit", limit)
    u.write()
    return { "status": "ok" }

@admin_api('/admin/user/suspend')
def admin_user_suspend():
    username, suspend, reason = [request.forms.get(n) for n in ('username', 'suspend', 'reason')]
    
    u = user.get_by_username(username)
    u.suspended = suspend == "1"
    if reason:
        datestr = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
        u.set_meta("limiter_log", "%s: %s"%(datestr, reason))
    u.write()
    return { "username": username, "suspended": u.suspended }

# Login and Logout

@get('/logout')
def logout():
    response.set_cookie('ssl_uid', '', expires=0)
    response.set_cookie('ssl_pw', '', expires=0)
    return redirect('/login')

@get('/login')
def login():
    return template('login', salt=config.USER_SALT)

@post('/login')
def do_login():
    username = request.forms.get('username')
    password = get_salted_password()
    
    current_user = user.get_by_username(username)
    logined = current_user and current_user.salted_password == password
    
    if logined:
        response.set_cookie('ssl_uid', str(current_user.id))
        response.set_cookie('ssl_pw', password)
        return redirect('/')
    
    return template('login', 
        username=username, 
        message='User not found.' if not current_user else 'Password is incorrect.', 
        salt=config.USER_SALT
    )

@route('/static/<filename>')
def server_static(filename):
    return static_file(filename, root=WEB_ROOT+'/static')

if __name__ == "__main__":
    import argparse, os, sys, time, signal
    parser = argparse.ArgumentParser(description='SSLand Web Server')
    parser.add_argument('-d', '--daemon',  action='store', required=False, help="Control web server daemon")
    flags = parser.parse_args(sys.argv[1:])
    
    DAEMON_PID_FILE = config.TMP_ROOT + "/ssland.web.pid"
    
    if flags.daemon in ('stop', 'restart'):
        try:
            with open(DAEMON_PID_FILE, 'r') as f:
                pid = int(f.read())
                os.kill(pid, signal.SIGTERM)
                print("Stopped PID %d" % pid)
            os.remove(DAEMON_PID_FILE)
        except:
            pass
        if flags.daemon == 'stop': sys.exit(0)
    
    if flags.daemon in ('start', 'restart'):
        
        def freopen(f, mode, stream):
            oldf = open(f, mode)
            oldfd = oldf.fileno()
            newfd = stream.fileno()
            os.close(newfd)
            os.dup2(oldfd, newfd)
            
        def handle_exit(signum, _):
            if signum == signal.SIGTERM:
                sys.exit(0)
            sys.exit(1)
        signal.signal(signal.SIGINT, handle_exit)
        signal.signal(signal.SIGTERM, handle_exit)
        
        already_running=False
        try:
            with open(DAEMON_PID_FILE, 'r') as f:
                pid = int(f.read())
                os.kill(pid, 0)
                print("Already running daemon with PID %d" % pid)
                already_running=True
        except:
            pass
            
        if already_running:
            sys.exit(0)
        else:
            # Thread not found. Create
            pid = os.fork()
            assert pid != -1
            if pid > 0:
                # parent waits for its child
                time.sleep(5)
                sys.exit(0)
                
            # child signals its parent to exit
            ppid = os.getppid()
            pid = os.getpid()
            
            with open(DAEMON_PID_FILE, 'w') as f:
                f.write(str(pid))
            
            os.setsid()
            signal.signal(signal.SIGHUP, signal.SIG_IGN)
            
            print("Daemon running, PID %d" % pid)
            os.kill(ppid, signal.SIGTERM)
            
            sys.stdin.close()
            try:
                log_file = "/var/log/ssland.web.log"
                freopen(log_file, 'a', sys.stdout)
                freopen(log_file, 'a', sys.stderr)
            except:
                pass
    
    run(host=config.WEB_HOST, port=config.WEB_PORT)