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#!/usr/bin/python3
# coding=utf-8
import falcon
import json
import client
from errors.session import NoSuchSession, AuthenticationFailed
MAX_REQUEST_LENGTH = 1024 * 1024 # 1 MB
api = application = falcon.API()
def get_json_payload(req, session_is_optional=False):
content_type_parts = req.content_type.split(';')
content_type = content_type_parts[0].strip()
encoding = 'utf-8'
if len(content_type_parts) > 1:
for part in content_type_parts[1:]:
subparts = part.strip().split('=')
if (len(subparts) == 2) and subparts[0] == 'charset':
encoding = subparts[1]
if not ((content_type == 'application/json') or (content_type == 'text/json')):
raise falcon.HTTPUnsupportedMediaType('Unsupported content-type: {0}'.format(req.content_type))
length = req.get_header('Content-Length')
if length is None:
raise falcon.HTTPLengthRequired('Requests without content-length are not accepted')
try:
l = int(length)
except:
raise falcon.HTTPBadRequest('Invalid Content-Length', 'The given Content-Length is not a number: {0}'.format(length))
if l > MAX_REQUEST_LENGTH:
raise falcon.HTTPError(falcon.HTTP_413, 'Request Entity Too Large', 'Cannot accept the request of length {0}: maximum allowed content-length is {1}'.format(length, MAX_REQUEST_LENGTH))
try:
txt = req.stream.read()
except Exception as e:
raise falcon.HTTPBadRequest('Error reading request', 'Error while reading the request body: {0}'.format(e.message))
try:
js = json.loads(txt.decode(encoding=encoding, errors='replace'))
except ValueError as e:
raise falcon.HTTPBadRequest('Error parsing JSON payload', 'Error while parsing the request as JSON: {0}'.format(e.message))
sid = js.get('sid')
if sid is None:
if session_is_optional:
return js, None
raise falcon.HTTPBadRequest('No Session', 'Request is missing a session-ID')
del js['sid']
try:
session = client.get_session_by_id(sid)
except NoSuchSession:
if session_is_optional:
return js, None
raise falcon.HTTPBadRequest('Session Expired', 'This user session has expired. Please log-in again.')
return js, session
class CodeqService(object):
"""Base class for all CodeQ services.
It only support the POST method and JSON data.
Handles JSON decoding and encoding, and session retrieval which can be optional.
"""
session_is_optional = False
def on_post(self, req, resp):
js, session = get_json_payload(req, self.session_is_optional)
resp.body = json.dumps(self.process(js, session))
resp.cache_control = 'private, no-cache, no-store'
resp.content_type = 'application/json'
resp.status = falcon.HTTP_200
def process(self, js, session):
raise falcon.HTTPNotFound()
class ProblemList(CodeqService):
session_is_optional = True
def process(self, js, session):
language = js.get('language')
if language is None:
return {'code': 1, 'message': 'Language was not provided'}
else:
return {'code': 0, 'message': 'ok', 'problems': client.list_problems_in_groups(language)}
class Login(CodeqService):
session_is_optional = True
def process(self, js, old_session):
username = js.get('username')
password = js.get('password')
if username is None:
return {'code': 1, 'message': 'Username was not provided'}
elif password is None:
return {'code': 2, 'message': 'Password was not provided'}
else:
try:
session = client.authenticate_and_create_session(username, password)
except AuthenticationFailed:
return {'code': 3, 'message': 'Username or password do not match'}
else:
if old_session:
old_session.destroy()
return {'code': 0, 'message': 'OK', 'sid':session.get_sid()}
class Activity(CodeqService):
def process(self, js, session):
trace = js.get('trace')
solution = js.get('solution')
problem_id = js.get('problem_id')
if (trace is not None) or (solution is not None):
# we have something to do
if problem_id is None:
return {'code': 1, 'message': 'Problem ID is missing'}
else:
session.update_solution(problem_id, trace, solution)
class Query(CodeqService):
def process(self, js, session):
step = js.get('step')
if step is None:
return {'code': 1, 'message': '"step" is not set'}
else:
problem_id = js.get('problem_id')
if problem_id is None:
return {'code': 4, 'message': 'Problem ID not given'}
trace = js.get('trace')
prolog = session.get_prolog()
program = None
if step == 'run':
program = js.get('program')
query = js.get('query')
if program is None:
result = {'code': 2, 'message': 'No program specified'}
elif query is None:
result = {'code': 3, 'message': 'No query specified'}
else:
messages, status, have_more = prolog.run_for_user(session.get_uid(), problem_id, program, query)
result = {'code': 0, 'message': 'ok', 'terminal': {'messages': messages, 'status': status, 'have_more': have_more}}
elif step == 'next':
messages, status, have_more = prolog.step()
result = {'code': 0, 'message': 'ok', 'terminal': {'messages': messages, 'status': status, 'have_more': have_more}}
elif step == 'end':
messages, status, have_more = prolog.end()
result = {'code': 0, 'message': 'ok', 'terminal': {'messages': messages, 'status': status, 'have_more': have_more}}
else:
result = {'code': 5, 'message': 'Unknown prolog step: {0}'.format(step)}
if program or trace:
session.update_solution(problem_id, trace, program)
return result
class Hint(CodeqService):
def process(self, js, session):
problem_id = js.get('problem_id')
program = js.get('program')
if problem_id is None:
return {'code': 1, 'message': 'Problem ID not given'}
if program is None:
return {'code': 2, 'message': 'No program specified'}
prolog = session.get_prolog()
hints = prolog.hint(session.get_uid(), problem_id, program)
return {'code': 0, 'message': 'ok', 'hints': hints}
class Test(CodeqService):
def process(self, js, session):
problem_id = js.get('problem_id')
program = js.get('program')
if problem_id is None:
return {'code': 1, 'message': 'Problem ID not given'}
if program is None:
return {'code': 2, 'message': 'No program specified'}
prolog = session.get_prolog()
messages = prolog.test(session.get_uid(), problem_id, program)
return {'code': 0, 'message': 'ok', 'hints': messages}
class GetProblem(CodeqService):
def process(self, js, session):
language = js.get('language')
problem_group = js.get('problem_group')
problem = js.get('problem')
if language is None:
return {'code': 1, 'message': 'Language identifier not given'}
elif problem_group is None:
return {'code': 2, 'message': 'Problem group identifier not given'}
elif problem is None:
return {'code': 3, 'message': 'Problem identifier not given'}
else:
return {'code': 0, 'message': 'ok', 'data': session.get_problem_data(language, problem_group, problem)}
problem_list = ProblemList()
api.add_route('/list_problems', problem_list)
login = Login()
api.add_route('/login', login)
activity = Activity()
api.add_route('/activity', activity)
query = Query()
api.add_route('/query', query)
hint = Hint()
api.add_route('/hint', hint)
test = Test()
api.add_route('/test', test)
get_problem = GetProblem()
api.add_route('/get_problem', get_problem)
if __name__ == '__main__':
import logging
from waitress import serve
logger = logging.getLogger('waitress')
logger.setLevel(logging.DEBUG)
serve(application, host='0.0.0.0', port=8082)
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