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utils.py
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/
utils.py
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from google.appengine.ext.ndb import Key
from google.appengine.api import users, urlfetch
from jerry.app_engine import Provider
from models import LogEntry
import hmac
import hashlib
import binascii
import webapp2
import json
import urllib
import config
class MySelfProvider(Provider):
def __init__(self, *args, **kwargs):
Provider.__init__(self, *args, **kwargs)
self.app_access = Key(urlsafe=self.key).get()
def _set_memcache(self, *args, **kwargs):
# ignore internal memcache
pass
def _signin(self, user):
state = self.app_access.compile_profile_state(user.user_id, user.device_id)
user.load_state(state)
def did(self, user, action, change, **kwargs):
LogEntry.make(self.app_access.key, user.user_id, user.device_id,
action=action, quantity=change, **kwargs).put()
def _get_jerry_provider():
return MySelfProvider(**config.jerry)
def _get_user():
user = users.get_current_user()
if not user:
webapp2.abort(400, "User needs to be logged in")
user.jerry_profile = _get_jerry_provider().signin(user.user_id())
return user
def verify_user(func):
def wrapped(self, *args, **kwargs):
self.user = _get_user()
self.jerry_profile = self.user.jerry_profile
return func(self, *args, **kwargs)
return wrapped
def json_load_params(request):
params = request.POST
if not params:
params = json.loads(request.body)
return params
def understand_post(func):
def wrapped(self, *args, **kwargs):
return func(self, json_load_params(self.request), *args, **kwargs)
return wrapped
def _get_key(params):
app_key = params.get("_key")
if not app_key:
webapp2.abort(400, "_key and _signature must be provided")
try:
app_access = Key(urlsafe=app_key).get()
secret = app_access.secret
except Exception:
webapp2.abort(401, "Unknown key: {}".format(app_key))
return app_access
def verify_request(method, url, params):
signature = params.pop("_signature")
if not signature:
webapp2.abort(400, "_key and _signature must be provided")
app_access = _get_key(params)
app_secret = app_access.secret
enc_params = urllib.urlencode(params)
hashed = hmac.new(app_secret.encode("utf-8"),
"&".join((method.upper(), url, enc_params)), hashlib.sha256)
my_signature = binascii.b2a_base64(hashed.digest())
if my_signature != signature:
webapp2.abort(403, "invalid signature")
app_access.jerry_profile = _get_jerry_provider().signin(app_access.owner.user_id())
return app_access
def as_json(fun):
def wrapped(handler, *args, **kwargs):
wrap_it = not handler.request.params.get("_raw")
debug = not handler.request.params.get("_debug")
try:
res = fun(handler, *args, **kwargs)
if isinstance(res, webapp2.Response):
# someone with a higher power knows what he is doing
return res
if wrap_it:
res = {"status": "success", "result": res}
handler.response.content_type = "application/json"
handler.response.write(json.dumps(res))
except webapp2.HTTPException, exc:
if debug:
raise
handler.response.status = exc.code
handler.response.content_type = "application/json"
handler.response.write(json.dumps({
"status": "error",
"message": "{}".format(exc.message)
}))
except Exception, exc:
if debug:
raise
handler.response.status = 500
handler.response.content_type = "application/json"
handler.response.write(json.dumps({
"status": "error",
"message": "{}".format(exc.message)
}))
return wrapped
def verified_api_request(func, without_key=False):
def wrapped(handler, *args, **kwargs):
params = dict(handler.request.params)
if '_signature' in params:
handler.app_access = verify_request(handler.request.method,
handler.request.path_url, params)
handler.jerry_profile = handler.app_access.jerry_profile
else:
handler.user = _get_user()
handler.jerry_profile = handler.user.jerry_profile
if not without_key:
handler.app_access = _get_key(params)
return func(handler, *args, **kwargs)
return as_json(wrapped)
def init_jerry_db():
from google.appengine.ext.ndb import Key
from models import AppAccess, Profile
app = AppAccess(key=Key(urlsafe="agxkZXZ-ai1lcnJpY29yEAsSCUFwcEFjY2VzcxjpBww"),
name="jerrico", secret="982b3800288b452a888e3bd31d982adf")
app.put()
Profile(name="free", default=True, parent=app.key).put()
Profile(name="premium", default=False, parent=app.key).put()
Profile(name="megalon", allow_per_default=True, parent=app.key).put()