#!/usr/bin/env python3
# -*- coding: utf-8 -*-

r'''
learning.py

A Python 3 tutorial from http://www.liaoxuefeng.com

Usage:

python3 learning.py
'''

import sys

def check_version():
 v = sys.version_info
 if v.major == 3 and v.minor >= 4:
 return True
 print('Your current python is %d.%d. Please use Python 3.4.' % (v.major, v.minor))
 return False

if not check_version():
 exit(1)

import os, io, json, subprocess, tempfile
from urllib import parse
from wsgiref.simple_server import make_server

EXEC = sys.executable
PORT = 39093
HOST = 'local.liaoxuefeng.com:%d' % PORT
TEMP = tempfile.mkdtemp(suffix='_py', prefix='learn_python_')
INDEX = 0

def main():
 httpd = make_server('127.0.0.1', PORT, application)
 print('Ready for Python code on port %d...' % PORT)
 httpd.serve_forever()

def get_name():
 global INDEX
 INDEX = INDEX + 1
 return 'test_%d' % INDEX

def write_py(name, code):
 fpath = os.path.join(TEMP, '%s.py' % name)
 with open(fpath, 'w', encoding='utf-8') as f:
 f.write(code)
 print('Code wrote to: %s' % fpath)
 return fpath

def decode(s):
 try:
 return s.decode('utf-8')
 except UnicodeDecodeError:
 return s.decode('gbk')

def application(environ, start_response):
 host = environ.get('HTTP_HOST')
 method = environ.get('REQUEST_METHOD')
 path = environ.get('PATH_INFO')
 if method == 'GET' and path == '/':
 start_response('200 OK', [('Content-Type', 'text/html')])
 return [b'']
 if method == 'GET' and path == '/env':
 start_response('200 OK', [('Content-Type', 'text/html')])
 L = [b'']
 for k, v in environ.items():
 p = '
%s = %s' % (k, str(v))
 L.append(p.encode('utf-8'))
 L.append(b'')
 return L
 if host != HOST or method != 'POST' or path != '/run' or not environ.get('CONTENT_TYPE', '').lower().startswith('application/x-www-form-urlencoded'):
 start_response('400 Bad Request', [('Content-Type', 'application/json')])
 return [b'{"error":"bad_request"}']
 s = environ['wsgi.input'].read(int(environ['CONTENT_LENGTH']))
 qs = parse.parse_qs(s.decode('utf-8'))
 if not 'code' in qs:
 start_response('400 Bad Request', [('Content-Type', 'application/json')])
 return [b'{"error":"invalid_params"}']
 name = qs['name'][0] if 'name' in qs else get_name()
 code = qs['code'][0]
 headers = [('Content-Type', 'application/json')]
 origin = environ.get('HTTP_ORIGIN', '')
 if origin.find('.liaoxuefeng.com') == -1:
 start_response('400 Bad Request', [('Content-Type', 'application/json')])
 return [b'{"error":"invalid_origin"}']
 headers.append(('Access-Control-Allow-Origin', origin))
 start_response('200 OK', headers)
 r = dict()
 try:
 fpath = write_py(name, code)
 print('Execute: %s %s' % (EXEC, fpath))
 r['output'] = decode(subprocess.check_output([EXEC, fpath], stderr=subprocess.STDOUT, timeout=5))
 except subprocess.CalledProcessError as e:
 r = dict(error='Exception', output=decode(e.output))
 except subprocess.TimeoutExpired as e:
 r = dict(error='Timeout', output='執行超時')
 except subprocess.CalledProcessError as e:
 r = dict(error='Error', output='執行錯誤')
 print('Execute done.')
 return [json.dumps(r).encode('utf-8')]

if __name__ == '__main__':
 main()