aiohttp-security/aiohttp_security/api.py

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import asyncio
import enum
from aiohttp import web
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from aiohttp_security.abc import (AbstractIdentityPolicy,
AbstractAuthorizationPolicy)
from functools import wraps
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IDENTITY_KEY = 'aiohttp_security_identity_policy'
AUTZ_KEY = 'aiohttp_security_autz_policy'
@asyncio.coroutine
def remember(request, response, identity, **kwargs):
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"""Remember identity into response.
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The action is performed by identity_policy.remember()
Usually the idenity is stored in user cookies homehow but may be
pushed into custom header also.
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"""
assert isinstance(identity, str), identity
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assert identity
identity_policy = request.app.get(IDENTITY_KEY)
if identity_policy is None:
text = ("Security subsystem is not initialized, "
"call aiohttp_security.setup(...) first")
# in order to see meaningful exception message both: on console
# output and rendered page we add same message to *reason* and
# *text* arguments.
raise web.HTTPInternalServerError(reason=text, text=text)
yield from identity_policy.remember(request, response, identity, **kwargs)
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@asyncio.coroutine
def forget(request, response):
"""Forget previously remembered identity.
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Usually it clears cookie or server-side storage to forget user
session.
"""
identity_policy = request.app.get(IDENTITY_KEY)
if identity_policy is None:
text = ("Security subsystem is not initialized, "
"call aiohttp_security.setup(...) first")
# in order to see meaningful exception message both: on console
# output and rendered page we add same message to *reason* and
# *text* arguments.
raise web.HTTPInternalServerError(reason=text, text=text)
yield from identity_policy.forget(request, response)
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@asyncio.coroutine
def authorized_userid(request):
identity_policy = request.app.get(IDENTITY_KEY)
autz_policy = request.app.get(AUTZ_KEY)
if identity_policy is None or autz_policy is None:
return None
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identity = yield from identity_policy.identify(request)
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if identity is None:
return None # non-registered user has None user_id
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user_id = yield from autz_policy.authorized_userid(identity)
return user_id
@asyncio.coroutine
def permits(request, permission, context=None):
assert isinstance(permission, (str, enum.Enum)), permission
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assert permission
identity_policy = request.app.get(IDENTITY_KEY)
autz_policy = request.app.get(AUTZ_KEY)
if identity_policy is None or autz_policy is None:
return True
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identity = yield from identity_policy.identify(request)
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# non-registered user still may has some permissions
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access = yield from autz_policy.permits(identity, permission, context)
return access
@asyncio.coroutine
def is_anonymous(request):
"""Check if user is anonymous.
User is considered anonymous if there is not identity
in request.
"""
identity_policy = request.app.get(IDENTITY_KEY)
if identity_policy is None:
return True
identity = yield from identity_policy.identify(request)
if identity is None:
return True
return False
def login_required(fn):
"""Decorator that restrict access only for authorized users.
User is considered authorized if authorized_userid
returns some value.
"""
@asyncio.coroutine
@wraps(fn)
def wrapped(*args, **kwargs):
request = args[-1]
if not isinstance(request, web.BaseRequest):
msg = ("Incorrect decorator usage. "
"Expecting `def handler(request)` "
"or `def handler(self, request)`.")
raise RuntimeError(msg)
userid = yield from authorized_userid(request)
if userid is None:
raise web.HTTPUnauthorized
ret = yield from fn(*args, **kwargs)
return ret
return wrapped
def has_permission(
permission,
context=None,
):
"""Decorator that restrict access only for authorized users
with correct permissions.
If user is not authorized - raises HTTPUnauthorized,
if user is authorized and does not have permission -
raises HTTPForbidden.
"""
def wrapper(fn):
@asyncio.coroutine
@wraps(fn)
def wrapped(*args, **kwargs):
request = args[-1]
if not isinstance(request, web.BaseRequest):
msg = ("Incorrect decorator usage. "
"Expecting `def handler(request)` "
"or `def handler(self, request)`.")
raise RuntimeError(msg)
userid = yield from authorized_userid(request)
if userid is None:
raise web.HTTPUnauthorized
allowed = yield from permits(request, permission, context)
if not allowed:
raise web.HTTPForbidden
ret = yield from fn(*args, **kwargs)
return ret
return wrapped
return wrapper
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def setup(app, identity_policy, autz_policy):
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assert isinstance(identity_policy, AbstractIdentityPolicy), identity_policy
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assert isinstance(autz_policy, AbstractAuthorizationPolicy), autz_policy
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app[IDENTITY_KEY] = identity_policy
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app[AUTZ_KEY] = autz_policy