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# Copyright 2011-2012 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 traceback import format_exc
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from time import time, mktime
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from django.conf import settings
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from django.http import HttpResponse
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from django.utils import simplejson as json
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from astakos.im.faults import BadRequest, Unauthorized, InternalServerError
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from astakos.im.models import AstakosUser
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def render_fault(request, fault):
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    if isinstance(fault, InternalServerError) and (settings.DEBUG or settings.TEST):
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        fault.details = format_exc(fault)
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    request.serialization = 'text'
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    data = fault.message + '\n'
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    if fault.details:
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        data += '\n' + fault.details
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    response = HttpResponse(data, status=fault.code)
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    response['Content-Length'] = len(response.content)
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    return response
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def authenticate(request):
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    # Normal Response Codes: 204
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    # Error Response Codes: internalServerError (500)
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    #                       badRequest (400)
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    #                       unauthorised (401)
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    try:
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        if request.method != 'GET':
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            raise BadRequest('Method not allowed.')
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        x_auth_token = request.META.get('HTTP_X_AUTH_TOKEN')
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        if not x_auth_token:
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            return render_fault(request, BadRequest('Missing X-Auth-Token'))
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        try:
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            user = AstakosUser.objects.get(auth_token=x_auth_token)
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        except AstakosUser.DoesNotExist, e:
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            return render_fault(request, Unauthorized('Invalid X-Auth-Token')) 
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        # Check if the is active.
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        if not user.is_active:
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            return render_fault(request, Unauthorized('User inactive'))
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        # Check if the token has expired.
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        if (time() - mktime(user.auth_token_expires.timetuple())) > 0:
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            return render_fault(request, Unauthorized('Authentication expired'))
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        response = HttpResponse()
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        response.status=204
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        user_info = {'username':user.username,
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                     'uniq':user.email,
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                     'auth_token':user.auth_token,
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                     'auth_token_created':user.auth_token_created.isoformat(),
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                     'auth_token_expires':user.auth_token_expires.isoformat()}
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        response.content = json.dumps(user_info)
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        response['Content-Type'] = 'application/json; charset=UTF-8'
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        response['Content-Length'] = len(response.content)
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        return response
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    except BaseException, e:
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        fault = InternalServerError('Unexpected error')
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        return render_fault(request, fault)