root / api / util.py @ 29a59bc1
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#
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# Copyright (c) 2010 Greek Research and Technology Network
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#
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from synnefo.api.errors import * |
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from synnefo.db.models import * |
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from django.http import HttpResponse |
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from django.template.loader import render_to_string |
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from django.utils import simplejson as json |
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from functools import wraps |
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from logging import getLogger |
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from random import choice |
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from string import ascii_letters, digits |
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from traceback import format_exc |
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from xml.etree import ElementTree |
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from xml.parsers.expat import ExpatError |
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log = getLogger('synnefo.api')
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def tag_name(e): |
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ns, sep, name = e.tag.partition('}')
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return name if sep else e.tag |
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def xml_to_dict(s): |
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# XXX Quick and dirty
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def _xml_to_dict(e): |
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root = {} |
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d = root[tag_name(e)] = dict(e.items())
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for child in e.getchildren(): |
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d.update(_xml_to_dict(child)) |
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return root
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return _xml_to_dict(ElementTree.fromstring(s.strip()))
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def get_user(): |
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# XXX Placeholder function, everything belongs to a single SynnefoUser for now
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try:
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return SynnefoUser.objects.all()[0] |
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except IndexError: |
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raise Unauthorized
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def get_request_dict(request): |
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data = request.raw_post_data |
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if request.type == 'xml': |
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try:
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return xml_to_dict(data)
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except ExpatError:
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raise BadRequest
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else:
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try:
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return json.loads(data)
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except ValueError: |
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raise BadRequest
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def random_password(length=8): |
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pool = ascii_letters + digits |
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return ''.join(choice(pool) for i in range(length)) |
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def render_fault(request, fault): |
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if settings.DEBUG or request.META.get('SERVER_NAME', None) == 'testserver': |
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fault.details = format_exc(fault) |
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if request.type == 'xml': |
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mimetype = 'application/xml'
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data = render_to_string('fault.xml', dict(fault=fault)) |
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else:
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mimetype = 'application/json'
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d = {fault.name: {'code': fault.code, 'message': fault.message, 'details': fault.details}} |
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data = json.dumps(d) |
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return HttpResponse(data, mimetype=mimetype, status=fault.code)
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def api_method(http_method): |
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def decorator(func): |
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@wraps(func)
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def wrapper(request, *args, **kwargs): |
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try:
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if request.path.endswith('.json'): |
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request.type = 'json'
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elif request.path.endswith('.xml'): |
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request.type = 'xml'
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else:
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request.type = 'json' # Default response format |
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for item in request.META.get('HTTP_ACCEPT', '').split(','): |
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accept, sep, rest = item.strip().partition(';')
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if accept == 'application/json': |
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break
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elif accept == 'application/xml': |
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request.type = 'xml'
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break
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if request.method != http_method:
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raise BadRequest()
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resp = func(request, *args, **kwargs) |
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resp['Content-Type'] = 'application/xml' if request.type == 'xml' else 'application/json' |
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return resp
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except Fault, fault:
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return render_fault(request, fault)
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except BaseException, e: |
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log.exception('Unexpected error: %s' % e)
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fault = ServiceUnavailable() |
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return render_fault(request, fault)
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return wrapper
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return decorator
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