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# Copyright 2011 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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#
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from django.contrib.auth.backends import ModelBackend
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from django.core.validators import email_re
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from astakos.im.models import AstakosUser
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class TokenBackend(ModelBackend):
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    """
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    AuthenticationBackend used to authenticate using token instead
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    """
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    def authenticate(self, email=None, auth_token=None):
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        try:
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            user = AstakosUser.objects.get(email=email, is_active=True)
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            if user.auth_token == auth_token:
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                return user
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        except AstakosUser.DoesNotExist:
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            return None
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    def get_user(self, user_id):
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        try:
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            return AstakosUser.objects.get(pk=user_id)
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        except AstakosUser.DoesNotExist:
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            return None
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class EmailBackend(ModelBackend):
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    """
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    If the ``username`` parameter is actually an email uses email to authenticate
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    the user else tries the username.
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    Used from ``astakos.im.forms.LoginForm`` to authenticate.
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    """
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    def authenticate(self, username=None, password=None):
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        #If username is an email address, then try to pull it up
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        if email_re.search(username):
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            try:
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                user = AstakosUser.objects.get(email=username, is_active=True)
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            except AstakosUser.DoesNotExist:
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                return None
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        else:
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            #We have a non-email address username we
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            #should try username
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            try:
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                user = AstakosUser.objects.get(username=username)
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            except AstakosUser.DoesNotExist:
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                return None
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        if user.check_password(password):
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            return user
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    def get_user(self, user_id):
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        try:
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            return AstakosUser.objects.get(pk=user_id)
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        except AstakosUser.DoesNotExist:
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            return None