Source

django-piston / piston / emitters.py

Jesper Nøhr b0a1571 

Benjamin Pollack 8db39c8 
dfde...@gmail.co… 4d4ea56 
Jesper Nøhr 79f7f6d 






Jesper Nøhr e1d7a29 
Jesper Nøhr f8a0dfc 









Jesper Nøhr 4775806 
Jesper Nøhr 5dd2366 
Jesper Nøhr 4775806 
Mads Sülau Valst… 8273ecc 

Jesper Nøhr ca114ba 
Jesper Nøhr 4775806 
Jesper Nøhr 2ac6494 
Jesper Nøhr e8b4481 
Jesper Nøhr e1d7a29 
Jesper Nøhr 88a4cda 
garethr f558b2c 
Jesper Nøhr 4775806 
Mads Sülau Valst… 8273ecc 




Jesper Nøhr 23ebc37 




Jesper Nøhr 3b64fcd 


Jesper Nøhr 4775806 
Jesper Nøhr f50c817 





Jesper Nøhr aaf0c2d 



Jesper Nøhr f50c817 
Jesper Nøhr 23ebc37 
ion.scerbatiuc f85951d 
Jesper Nøhr aaf0c2d 

Jesper Nøhr 23ebc37 
Jesper Nøhr a90c5bf 
Jesper Nøhr 7e872e4 
Jesper Nøhr 8ba536f 
Jesper Nøhr 6558b3e 
Jesper Nøhr ac2ebcf 
Jesper Nøhr a90c5bf 
ion.scerbatiuc f85951d 
Jesper Nøhr ab8a03e 

ion.scerbatiuc f85951d 
Jesper Nøhr aaf0c2d 

Jesper Nøhr 7042cd3 
Jesper Nøhr 3ef3792 

ion.scerbatiuc f85951d 
Jesper Nøhr aaf0c2d 





Jesper Nøhr 3ef3792 
ion.scerbatiuc f85951d 
Jesper Nøhr 4775806 
Jesper Nøhr f50c817 



ion.scerbatiuc f85951d 
Jesper Nøhr f50c817 

Jesper Nøhr c4b2d21 
Jesper Nøhr f50c817 


Jesper Nøhr 4775806 
ion.scerbatiuc f85951d 
xavi...@ptit-mec… f2eeaa7 
Jesper Nøhr c4b2d21 
Ionel Cristian M… acfdf76 
Jesper Nøhr c4b2d21 
Jesper Nøhr 4775806 
Sever Banesiu 9ba4a23 
Jesper Nøhr 4775806 


Jesper Nøhr c9fe89f 
Jesper Nøhr 2ac6494 
Jesper Nøhr 2de9bcc 
Benjamin Pollack 8db39c8 
Jesper Nøhr 6558b3e 

Benjamin Pollack 612b3e6 



Jesper Nøhr aaf0c2d 

Jesper Nøhr 4775806 
Jesper Nøhr f50c817 
Jesper Nøhr 4775806 


Jesper Nøhr 7e872e4 
Jesper Nøhr f50c817 


Jesper Nøhr 8ba536f 
ion.scerbatiuc f85951d 
Jesper Nøhr c4b2d21 
Mads Sülau Valst… de8bfef 


Jesper Nøhr 9997709 
ion.scerbatiuc f85951d 
Jesper Nøhr c4b2d21 
Jesper Nøhr f50c817 


Jesper Nøhr 9997709 
ion.scerbatiuc f85951d 
Jesper Nøhr c4b2d21 
Jesper Nøhr f50c817 



Jesper Nøhr 4775806 
Jesper Nøhr 3ef3792 
Jesper Nøhr 90ebe10 
ion.scerbatiuc f85951d 
Jesper Nøhr 3ef3792 
Jesper Nøhr 7e872e4 
Joshua Ginsberg b9869d4 






Jesper Nøhr c4b2d21 



Jesper Nøhr a90c5bf 





Jesper Nøhr f34e64f 
Jesper Nøhr 90ebe10 


ion.scerbatiuc f85951d 
Jesper Nøhr 9997709 

Ionel Cristian M… 56a00eb 
Ionel Cristian M… c22f767 


ion.scerbatiuc f85951d 
Jesper Nøhr 9997709 



ion.scerbatiuc f85951d 
Jesper Nøhr 9997709 



ion.scerbatiuc f85951d 
Jesper Nøhr 9997709 


dfde...@gmail.co… 5a189a7 
ion.scerbatiuc f85951d 
Ionel Cristian M… 56a00eb 
Jesper Nøhr f8a0dfc 
Jesper Nøhr 7e872e4 
Jesper Nøhr f50c817 
Jesper Nøhr 7e872e4 
Jesper Nøhr f50c817 
Jesper Nøhr 7e872e4 
Jesper Nøhr f50c817 
Jesper Nøhr 7e872e4 
Jesper Nøhr f50c817 
ion.scerbatiuc f85951d 
Jesper Nøhr 7e872e4 
Jesper Nøhr 3ef3792 
Jesper Nøhr f50c817 
Jesper Nøhr 7e872e4 
Jesper Nøhr f50c817 
ion.scerbatiuc f85951d 
Jesper Nøhr 8ba536f 
Jesper Nøhr f50c817 
Jesper Nøhr 9997709 






Jesper Nøhr faafc8c 


Jesper Nøhr 9997709 


Jesper Nøhr 3ef3792 



Jesper Nøhr 37af04a 
Jesper Nøhr 3ef3792 
ion.scerbatiuc f85951d 
Jesper Nøhr 9997709 
Thibaud Morel l'… e539a10 
Jesper Nøhr 7be2fee 
jiaaro e85842d 
Jesper Nøhr faafc8c 
Jesper Nøhr 7be2fee 

Jesper Nøhr 6558b3e 
Jesper Nøhr e8b4481 
Jesper Nøhr 6558b3e 

Jesper Nøhr 37af04a 
Jesper Nøhr 9997709 
Jesper Nøhr 7e872e4 


ion.scerbatiuc f85951d 
Jesper Nøhr 7e872e4 

ion.scerbatiuc f85951d 
Jesper Nøhr 7e872e4 

ion.scerbatiuc f85951d 
Jesper Nøhr 5dd2366 
Jesper Nøhr 198c9f4 

Jesper Nøhr 5dd2366 
Jesper Nøhr 3b64fcd 
Jesper Nøhr ca114ba 

Jesper Nøhr 3b64fcd 

Jesper Nøhr ca114ba 
ion.scerbatiuc f85951d 
Jesper Nøhr 1496336 
Jesper Nøhr 5dd2366 

ion.scerbatiuc f85951d 
Jesper Nøhr 76c0ea5 
Jesper Nøhr 47be5fe 
Jesper Nøhr 76c0ea5 

ion.scerbatiuc f85951d 
Jesper Nøhr 4775806 
ion.scerbatiuc f85951d 
Jesper Nøhr c4b2d21 
xavi...@ptit-mec… f2eeaa7 
johnnoonr 71c5ca7 
xavi...@ptit-mec… f2eeaa7 

ion.scerbatiuc f85951d 
Jesper Nøhr c4b2d21 
Jesper Nøhr f50c817 


ion.scerbatiuc 689c729 
ion.scerbatiuc f85951d 
Jesper Nøhr c4b2d21 
Jesper Nøhr f50c817 


Sever Banesiu 9ba4a23 
ion.scerbatiuc f85951d 
Jesper Nøhr a90c5bf 
Jesper Nøhr ac2ebcf 
ion.scerbatiuc f85951d 
Jesper Nøhr a90c5bf 



ion.scerbatiuc f85951d 
Jesper Nøhr 4775806 
Jesper Nøhr f50c817 



Jesper Nøhr 4775806 
ion.scerbatiuc f85951d 
Jesper Nøhr b0a1571 







ion.scerbatiuc f85951d 
Jesper Nøhr 4775806 

Jesper Nøhr f50c817 


Jesper Nøhr 23ebc37 



ion.scerbatiuc f85951d 
Jesper Nøhr 23ebc37 



ion.scerbatiuc f85951d 
Jesper Nøhr 23ebc37 





ion.scerbatiuc f85951d 
Jesper Nøhr 23ebc37 






ion.scerbatiuc f85951d 
Jesper Nøhr 4775806 
Mads Sülau Valst… 8273ecc 


Jesper Nøhr 5e8a41a 
Mads Sülau Valst… 8273ecc 
Jesper Nøhr 5e8a41a 
Mads Sülau Valst… 8273ecc 




Jesper Nøhr 7657cd6 
Mads Sülau Valst… 8273ecc 

Jesper Nøhr 2ac6494 
Mads Sülau Valst… 8273ecc 
ion.scerbatiuc f85951d 
Mads Sülau Valst… 8273ecc 


ion.scerbatiuc f85951d 
Mads Sülau Valst… 8273ecc 
ion.scerbatiuc f85951d 
Mads Sülau Valst… 8273ecc 

ion.scerbatiuc f85951d 
Mads Sülau Valst… 8273ecc 

Jesper Nøhr 23ebc37 
Jesper Nøhr 88a4cda 
Jesper Nøhr 23ebc37 
Jesper Nøhr 4775806 
Jesper Nøhr f50c817 


Jesper Nøhr 2ac6494 
Jesper Nøhr 55efadd 
Jesper Nøhr 2de9bcc 
Jesper Nøhr 2ac6494 

Jesper Nøhr 55efadd 
Jesper Nøhr 2ac6494 


ion.scerbatiuc f85951d 
Jesper Nøhr 23ebc37 
Jesper Nøhr 88a4cda 
ion.scerbatiuc f85951d 
Jesper Nøhr 4775806 
Jesper Nøhr f50c817 



Jesper Nøhr 2ac6494 
Jesper Nøhr 8ba536f 
Jesper Nøhr 23ebc37 
Jesper Nøhr 79f7f6d 

Joshua Ginsberg 24fcc35 
Jesper Nøhr 23ebc37 






ion.scerbatiuc f85951d 
Jesper Nøhr 88a4cda 
Jesper Nøhr 945dbda 










Jesper Nøhr e8b4481 




Jesper Nøhr e4fb353 
Jesper Nøhr e8b4481 




Jesper Nøhr e4fb353 
Jesper Nøhr e8b4481 

ion.scerbatiuc f85951d 
Jesper Nøhr e8b4481 
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from __future__ import generators

import decimal, re, inspect
import copy

try:
    # yaml isn't standard with python.  It shouldn't be required if it
    # isn't used.
    import yaml
except ImportError:
    yaml = None

# Fallback since `any` isn't in Python <2.5
try:
    any
except NameError:
    def any(iterable):
        for element in iterable:
            if element:
                return True
        return False

from django.db.models.query import QuerySet
from django.db.models import Model, permalink
from django.utils import simplejson
from django.utils.xmlutils import SimplerXMLGenerator
from django.utils.encoding import smart_unicode
from django.core.urlresolvers import reverse, NoReverseMatch
from django.core.serializers.json import DateTimeAwareJSONEncoder
from django.http import HttpResponse
from django.core import serializers

from utils import HttpStatusCode, Mimer
from validate_jsonp import is_valid_jsonp_callback_value

try:
    import cStringIO as StringIO
except ImportError:
    import StringIO

try:
    import cPickle as pickle
except ImportError:
    import pickle

# Allow people to change the reverser (default `permalink`).
reverser = permalink

class Emitter(object):
    """
    Super emitter. All other emitters should subclass
    this one. It has the `construct` method which
    conveniently returns a serialized `dict`. This is
    usually the only method you want to use in your
    emitter. See below for examples.

    `RESERVED_FIELDS` was introduced when better resource
    method detection came, and we accidentially caught these
    as the methods on the handler. Issue58 says that's no good.
    """
    EMITTERS = { }
    RESERVED_FIELDS = set([ 'read', 'update', 'create',
                            'delete', 'model', 'anonymous',
                            'allowed_methods', 'fields', 'exclude' ])

    def __init__(self, payload, typemapper, handler, fields=(), anonymous=True):
        self.typemapper = typemapper
        self.data = payload
        self.handler = handler
        self.fields = fields
        self.anonymous = anonymous

        if isinstance(self.data, Exception):
            raise

    def method_fields(self, handler, fields):
        if not handler:
            return { }

        ret = dict()

        for field in fields - Emitter.RESERVED_FIELDS:
            t = getattr(handler, str(field), None)

            if t and callable(t):
                ret[field] = t

        return ret

    def construct(self):
        """
        Recursively serialize a lot of types, and
        in cases where it doesn't recognize the type,
        it will fall back to Django's `smart_unicode`.

        Returns `dict`.
        """
        def _any(thing, fields=None):
            """
            Dispatch, all types are routed through here.
            """
            ret = None

            if isinstance(thing, QuerySet):
                ret = _qs(thing, fields)
            elif isinstance(thing, (tuple, list, set)):
                ret = _list(thing, fields)
            elif isinstance(thing, dict):
                ret = _dict(thing, fields)
            elif isinstance(thing, decimal.Decimal):
                ret = str(thing)
            elif isinstance(thing, Model):
                ret = _model(thing, fields)
            elif isinstance(thing, HttpResponse):
                raise HttpStatusCode(thing)
            elif inspect.isfunction(thing):
                if not inspect.getargspec(thing)[0]:
                    ret = _any(thing())
            elif hasattr(thing, '__emittable__'):
                f = thing.__emittable__
                if inspect.ismethod(f) and len(inspect.getargspec(f)[0]) == 1:
                    ret = _any(f())
            elif repr(thing).startswith("<django.db.models.fields.related.RelatedManager"):
                ret = _any(thing.all())
            else:
                ret = smart_unicode(thing, strings_only=True)

            return ret

        def _fk(data, field):
            """
            Foreign keys.
            """
            return _any(getattr(data, field.name))

        def _related(data, fields=None):
            """
            Foreign keys.
            """
            return [ _model(m, fields) for m in data.iterator() ]

        def _m2m(data, field, fields=None):
            """
            Many to many (re-route to `_model`.)
            """
            return [ _model(m, fields) for m in getattr(data, field.name).iterator() ]

        def _model(data, fields=None):
            """
            Models. Will respect the `fields` and/or
            `exclude` on the handler (see `typemapper`.)
            """
            ret = { }
            handler = self.in_typemapper(type(data), self.anonymous)
            get_absolute_uri = False

            if handler or fields:
                v = lambda f: getattr(data, f.attname)
                # FIXME
                # Catch 22 here. Either we use the fields from the
                # typemapped handler to make nested models work but the
                # declared list_fields will ignored for models, or we
                # use the list_fields from the base handler and accept that
                # the nested models won't appear properly
                # Refs #157
                if handler:
                    fields = getattr(handler, 'fields')    
                
                if not fields or hasattr(handler, 'fields'):
                    """
                    Fields was not specified, try to find teh correct
                    version in the typemapper we were sent.
                    """
                    mapped = self.in_typemapper(type(data), self.anonymous)
                    get_fields = set(mapped.fields)
                    exclude_fields = set(mapped.exclude).difference(get_fields)

                    if 'absolute_uri' in get_fields:
                        get_absolute_uri = True

                    if not get_fields:
                        get_fields = set([ f.attname.replace("_id", "", 1)
                            for f in data._meta.fields + data._meta.virtual_fields])
                    
                    if hasattr(mapped, 'extra_fields'):
                        get_fields.update(mapped.extra_fields)

                    # sets can be negated.
                    for exclude in exclude_fields:
                        if isinstance(exclude, basestring):
                            get_fields.discard(exclude)

                        elif isinstance(exclude, re._pattern_type):
                            for field in get_fields.copy():
                                if exclude.match(field):
                                    get_fields.discard(field)

                else:
                    get_fields = set(fields)

                met_fields = self.method_fields(handler, get_fields)

                for f in data._meta.local_fields + data._meta.virtual_fields:
                    if f.serialize and not any([ p in met_fields for p in [ f.attname, f.name ]]):
                        if not f.rel:
                            if f.attname in get_fields:
                                ret[f.attname] = _any(v(f))
                                get_fields.remove(f.attname)
                        else:
                            if f.attname[:-3] in get_fields:
                                ret[f.name] = _fk(data, f)
                                get_fields.remove(f.name)

                for mf in data._meta.many_to_many:
                    if mf.serialize and mf.attname not in met_fields:
                        if mf.attname in get_fields:
                            ret[mf.name] = _m2m(data, mf)
                            get_fields.remove(mf.name)

                # try to get the remainder of fields
                for maybe_field in get_fields:
                    if isinstance(maybe_field, (list, tuple)):
                        model, fields = maybe_field
                        inst = getattr(data, model, None)

                        if inst:
                            if hasattr(inst, 'all'):
                                ret[model] = _related(inst, fields)
                            elif callable(inst):
                                if len(inspect.getargspec(inst)[0]) == 1:
                                    ret[model] = _any(inst(), fields)
                            else:
                                ret[model] = _model(inst, fields)

                    elif maybe_field in met_fields:
                        # Overriding normal field which has a "resource method"
                        # so you can alter the contents of certain fields without
                        # using different names.
                        ret[maybe_field] = _any(met_fields[maybe_field](data))

                    else:
                        maybe = getattr(data, maybe_field, None)
                        if maybe is not None:
                            if callable(maybe):
                                if len(inspect.getargspec(maybe)[0]) <= 1:
                                    ret[maybe_field] = _any(maybe())
                            else:
                                ret[maybe_field] = _any(maybe)
                        else:
                            handler_f = getattr(handler or self.handler, maybe_field, None)

                            if handler_f:
                                ret[maybe_field] = _any(handler_f(data))

            else:
                for f in data._meta.fields:
                    ret[f.attname] = _any(getattr(data, f.attname))

                fields = dir(data.__class__) + ret.keys()
                add_ons = [k for k in dir(data) if k not in fields]

                for k in add_ons:
                    ret[k] = _any(getattr(data, k))

            # resouce uri
            if self.in_typemapper(type(data), self.anonymous):
                handler = self.in_typemapper(type(data), self.anonymous)
                if hasattr(handler, 'resource_uri'):
                    url_id, fields = handler.resource_uri(data)

                    try:
                        ret['resource_uri'] = reverser( lambda: (url_id, fields) )()
                    except NoReverseMatch, e:
                        pass

            if hasattr(data, 'get_api_url') and 'resource_uri' not in ret:
                try: ret['resource_uri'] = data.get_api_url()
                except: pass

            # absolute uri
            if hasattr(data, 'get_absolute_url') and get_absolute_uri:
                try: ret['absolute_uri'] = data.get_absolute_url()
                except: pass

            return ret

        def _qs(data, fields=None):
            """
            Querysets.
            """
            return [ _any(v, fields) for v in data ]

        def _list(data, fields=None):
            """
            Lists.
            """
            return [ _any(v, fields) for v in data ]

        def _dict(data, fields=None):
            """
            Dictionaries.
            """
            return dict([ (k, _any(v, fields)) for k, v in data.iteritems() ])

        # Kickstart the seralizin'.
        return _any(self.data, self.fields)

    def in_typemapper(self, model, anonymous):
        for klass, (km, is_anon) in self.typemapper.iteritems():
            if model is km and is_anon is anonymous:
                return klass

    def render(self):
        """
        This super emitter does not implement `render`,
        this is a job for the specific emitter below.
        """
        raise NotImplementedError("Please implement render.")

    def stream_render(self, request, stream=True):
        """
        Tells our patched middleware not to look
        at the contents, and returns a generator
        rather than the buffered string. Should be
        more memory friendly for large datasets.
        """
        yield self.render(request)

    @classmethod
    def get(cls, format):
        """
        Gets an emitter, returns the class and a content-type.
        """
        if cls.EMITTERS.has_key(format):
            return cls.EMITTERS.get(format)

        raise ValueError("No emitters found for type %s" % format)

    @classmethod
    def register(cls, name, klass, content_type='text/plain'):
        """
        Register an emitter.

        Parameters::
         - `name`: The name of the emitter ('json', 'xml', 'yaml', ...)
         - `klass`: The emitter class.
         - `content_type`: The content type to serve response as.
        """
        cls.EMITTERS[name] = (klass, content_type)

    @classmethod
    def unregister(cls, name):
        """
        Remove an emitter from the registry. Useful if you don't
        want to provide output in one of the built-in emitters.
        """
        return cls.EMITTERS.pop(name, None)

class XMLEmitter(Emitter):
    def _to_xml(self, xml, data):
        if isinstance(data, (list, tuple)):
            for item in data:
                xml.startElement("resource", {})
                self._to_xml(xml, item)
                xml.endElement("resource")
        elif isinstance(data, dict):
            for key, value in data.iteritems():
                xml.startElement(key, {})
                self._to_xml(xml, value)
                xml.endElement(key)
        else:
            xml.characters(smart_unicode(data))

    def render(self, request):
        stream = StringIO.StringIO()

        xml = SimplerXMLGenerator(stream, "utf-8")
        xml.startDocument()
        xml.startElement("response", {})

        self._to_xml(xml, self.construct())

        xml.endElement("response")
        xml.endDocument()

        return stream.getvalue()

Emitter.register('xml', XMLEmitter, 'text/xml; charset=utf-8')
Mimer.register(lambda *a: None, ('text/xml',))

class JSONEmitter(Emitter):
    """
    JSON emitter, understands timestamps.
    """
    def render(self, request):
        cb = request.GET.get('callback', None)
        seria = simplejson.dumps(self.construct(), cls=DateTimeAwareJSONEncoder, ensure_ascii=False, indent=4)

        # Callback
        if cb and is_valid_jsonp_callback_value(cb):
            return '%s(%s)' % (cb, seria)

        return seria

Emitter.register('json', JSONEmitter, 'application/json; charset=utf-8')
Mimer.register(simplejson.loads, ('application/json',))

class YAMLEmitter(Emitter):
    """
    YAML emitter, uses `safe_dump` to omit the
    specific types when outputting to non-Python.
    """
    def render(self, request):
        return yaml.safe_dump(self.construct())

if yaml:  # Only register yaml if it was import successfully.
    Emitter.register('yaml', YAMLEmitter, 'application/x-yaml; charset=utf-8')
    Mimer.register(lambda s: dict(yaml.safe_load(s)), ('application/x-yaml',))

class PickleEmitter(Emitter):
    """
    Emitter that returns Python pickled.
    """
    def render(self, request):
        return pickle.dumps(self.construct())

Emitter.register('pickle', PickleEmitter, 'application/python-pickle')

"""
WARNING: Accepting arbitrary pickled data is a huge security concern.
The unpickler has been disabled by default now, and if you want to use
it, please be aware of what implications it will have.

Read more: http://nadiana.com/python-pickle-insecure

Uncomment the line below to enable it. You're doing so at your own risk.
"""
# Mimer.register(pickle.loads, ('application/python-pickle',))

class DjangoEmitter(Emitter):
    """
    Emitter for the Django serialized format.
    """
    def render(self, request, format='xml'):
        if isinstance(self.data, HttpResponse):
            return self.data
        elif isinstance(self.data, (int, str)):
            response = self.data
        else:
            response = serializers.serialize(format, self.data, indent=True)

        return response

Emitter.register('django', DjangoEmitter, 'text/xml; charset=utf-8')