/usr/lib/python2.7/dist-packages/piston3/handler.py is in python-django-piston3 0.3~rc2-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | from six import add_metaclass
import warnings
from .utils import rc
from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
from django.conf import settings
typemapper = { }
handler_tracker = [ ]
class HandlerMetaClass(type):
"""
Metaclass that keeps a registry of class -> handler
mappings.
"""
def __new__(cls, name, bases, attrs):
new_cls = type.__new__(cls, name, bases, attrs)
def already_registered(model, anon):
for k, (m, a) in typemapper.items():
if model == m and anon == a:
return k
if hasattr(new_cls, 'model'):
if already_registered(new_cls.model, new_cls.is_anonymous):
if not getattr(settings, 'PISTON_IGNORE_DUPE_MODELS', False):
warnings.warn("Handler already registered for model %s, "
"you may experience inconsistent results." % new_cls.model.__name__)
typemapper[new_cls] = (new_cls.model, new_cls.is_anonymous)
else:
typemapper[new_cls] = (None, new_cls.is_anonymous)
if name not in ('BaseHandler', 'AnonymousBaseHandler'):
handler_tracker.append(new_cls)
return new_cls
@add_metaclass(HandlerMetaClass)
class BaseHandler(object):
"""
Basehandler that gives you CRUD for free.
You are supposed to subclass this for specific
functionality.
All CRUD methods (`read`/`update`/`create`/`delete`)
receive a request as the first argument from the
resource. Use this for checking `request.user`, etc.
"""
allowed_methods = ('GET', 'POST', 'PUT', 'DELETE')
anonymous = is_anonymous = False
exclude = ( 'id', )
fields = ( )
def flatten_dict(self, dct):
return dict([ (str(k), dct.get(k)) for k in dct.keys() ])
def has_model(self):
return hasattr(self, 'model') or hasattr(self, 'queryset')
def queryset(self, request):
return self.model.objects.all()
def value_from_tuple(tu, name):
for int_, n in tu:
if n == name:
return int_
return None
def exists(self, **kwargs):
if not self.has_model():
raise NotImplementedError
try:
self.model.objects.get(**kwargs)
return True
except self.model.DoesNotExist:
return False
def read(self, request, *args, **kwargs):
if not self.has_model():
return rc.NOT_IMPLEMENTED
pkfield = self.model._meta.pk.name
if pkfield in kwargs:
try:
return self.queryset(request).get(pk=kwargs.get(pkfield))
except ObjectDoesNotExist:
return rc.NOT_FOUND
except MultipleObjectsReturned: # should never happen, since we're using a PK
return rc.BAD_REQUEST
else:
return self.queryset(request).filter(*args, **kwargs)
def create(self, request, *args, **kwargs):
if not self.has_model():
return rc.NOT_IMPLEMENTED
attrs = self.flatten_dict(request.data)
try:
inst = self.queryset(request).get(**attrs)
return rc.DUPLICATE_ENTRY
except self.model.DoesNotExist:
inst = self.model(**attrs)
inst.save()
return inst
except self.model.MultipleObjectsReturned:
return rc.DUPLICATE_ENTRY
def update(self, request, *args, **kwargs):
if not self.has_model():
return rc.NOT_IMPLEMENTED
pkfield = self.model._meta.pk.name
if pkfield not in kwargs:
# No pk was specified
return rc.BAD_REQUEST
try:
inst = self.queryset(request).get(pk=kwargs.get(pkfield))
except ObjectDoesNotExist:
return rc.NOT_FOUND
except MultipleObjectsReturned: # should never happen, since we're using a PK
return rc.BAD_REQUEST
attrs = self.flatten_dict(request.data)
for k,v in attrs.items():
setattr( inst, k, v )
inst.save()
return rc.ALL_OK
def delete(self, request, *args, **kwargs):
if not self.has_model():
raise NotImplementedError
try:
inst = self.queryset(request).get(*args, **kwargs)
inst.delete()
return rc.DELETED
except self.model.MultipleObjectsReturned:
return rc.DUPLICATE_ENTRY
except self.model.DoesNotExist:
return rc.NOT_HERE
class AnonymousBaseHandler(BaseHandler):
"""
Anonymous handler.
"""
is_anonymous = True
allowed_methods = ('GET',)
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