Produits Entr'ouvert » Passerelle

Copyright

---------

django-jsonresponse (https://github.com/jjay/django-jsonresponse)

 # Files: passerelle/utils/jsonresponse.py

 # Copyright (c) 2012 Yasha Borevich <j.borevich@gmail.com>

 # Licensed under the BSD license

LOGGING['loggers'].update(

    {'suds': {

        'propagate': True

    },

    'passerelle.jsonresponse': {

        'level': 'ERROR'

    }

})

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

    @utils.to_json('api')

from passerelle.utils import to_json

from functools import wraps

import json

import re

from django.core.exceptions import PermissionDenied, ObjectDoesNotExist

from django.core.serializers.json import DjangoJSONEncoder

from django.http import HttpRequest, HttpResponse, HttpResponseBadRequest

from django.template import Template, Context

from django.utils.decorators import available_attrs

from django.views.generic.detail import SingleObjectMixin

from django.contrib.contenttypes.models import ContentType

from passerelle.base.context_processors import template_vars

from passerelle.base.models import ApiUser, AccessRight

from passerelle.base.signature import check_query

from .jsonresponse import to_json

def get_template_vars():

    """

    returns the template vars as dict, to be used in apps code

    """

    from django.http import HttpRequest

    return template_vars(HttpRequest())

def render_template_vars(value):

    """

    renders the template vars in a string

    """

    template = Template(value)

    return template.render(Context(get_template_vars()))

def response_for_json(request, data):

    response = HttpResponse(content_type='application/json')

    json_str = json.dumps(data)

    for variable in ('jsonpCallback', 'callback'):

        if variable in request.GET:

            identifier = request.GET[variable]

            if not re.match(r'^[$A-Za-z_][0-9A-Za-z_$]*$', identifier):

                return HttpResponseBadRequest('invalid JSONP callback name')

            json_str = '%s(%s);' % (identifier, json_str)

            break

    response.write(json_str)

    return response

def get_request_users(request):

    users = []

    users.extend(ApiUser.objects.filter(keytype=''))

    if 'orig' in request.GET and 'signature' in request.GET:

        orig = request.GET['orig']

        query = request.META['QUERY_STRING']

        signature_users = ApiUser.objects.filter(keytype='SIGN', username=orig)

        for signature_user in signature_users:

            if check_query(query, signature_user.key):

                users.append(signature_user)

    elif 'apikey' in request.GET:

        users.extend(ApiUser.objects.filter(keytype='API',

            key=request.GET['apikey']))

    elif request.META.has_key('HTTP_AUTHORIZATION'):

        (scheme, param) = request.META['HTTP_AUTHORIZATION'].split(' ',1)

        if scheme.lower() == 'basic':

            username, password = param.strip().decode('base64').split(':',1)

            users.extend(ApiUser.objects.filter(keytype='SIGN',

                    username=username, key=password))

    def ip_match(ip, match):

        if not ip:

            return True

        if ip == match:

            return True

        return False

    users = [x for x in users if ip_match(x.ipsource, request.META.get('REMOTE_ADDR'))]

    return users

def is_authorized(request, obj, perm):

    resource_type = ContentType.objects.get_for_model(obj)

    rights = AccessRight.objects.filter(resource_type=resource_type,

            resource_pk=obj.id, codename=perm)

    users = [x.apiuser for x in rights]

    return set(users).intersection(get_request_users(request))

def protected_api(perm):

    def decorator(view_func):

        @wraps(view_func, assigned=available_attrs(view_func))

        def _wrapped_view(instance, request, *args, **kwargs):

            if not isinstance(instance, SingleObjectMixin):

                raise Exception("protected_api must be applied on a method of a class based view")

            obj = instance.get_object()

            if not is_authorized(request, obj, perm):

                raise PermissionDenied()

            return view_func(instance, request, *args, **kwargs)

        return _wrapped_view

    return decorator

# This module is a modified copy of code of Yasha's Borevich library

# django-jsonresponse (https://github.com/jjay/django-jsonresponse) distributed

# under BSD license

import json

import functools

import logging

from collections import Iterable

from django.http import HttpResponse

from django.conf import settings

from django.core.exceptions import ObjectDoesNotExist, PermissionDenied

from django.core.serializers.json import DjangoJSONEncoder

DEFAULT_DEBUG = getattr(settings, 'JSONRESPONSE_DEFAULT_DEBUG', False)

CALLBACK_NAME = getattr(settings, 'JSONRESPONSE_CALLBACK_NAME', 'callback')

class to_json(object):

    """

    Wrap view functions to render python native and custom

    objects to json

    >>> from django.test.client import RequestFactory

    >>> requests = RequestFactory()

    Simple wrap returning data into json

    >>> @to_json('plain')

    ... def hello(request):

    ...    return dict(hello='world')

    >>> resp = hello(requests.get('/hello/'))

    >>> print resp.status_code

    200

    >>> print resp.content

    {"hello": "world"}

    Result can be wraped in some api manier

    >>> @to_json('api')

    ... def goodbye(request):

    ...    return dict(good='bye')

    >>> resp = goodbye(requests.get('/goodbye', {'debug': 1}))

    >>> print resp.status_code

    200

    >>> print resp.content

    {

        "data": {

            "good": "bye"

        },

        "err": 0

    }

    Automaticaly error handling

    >>> @to_json('api')

    ... def error(request):

    ...    raise Exception('Wooot!??')

    >>> resp = error(requests.get('/error', {'debug': 1}))

    >>> print resp.status_code

    500

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    {

        "err_class": "Exception",

        "err_desc": "Wooot!??",

        "data": null,

        "err": 1

    }

    >>> from django.core.exceptions import ObjectDoesNotExist

    >>> @to_json('api')

    ... def error_404(request):

    ...     raise ObjectDoesNotExist('Not found')

    >>> resp = error_404(requests.get('/error', {'debug': 1}))

    >>> print resp.status_code

    404

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    {

        "err_class": "django.core.exceptions.ObjectDoesNotExist",

        "err_desc": "Not found",

        "data": null,

        "err": 1

    }

    You can serialize not only pure python data types.

    Implement `serialize` method on toplevel object or

    each element of toplevel array.

    >>> class User(object):

    ...     def __init__(self, name, age):

    ...         self.name = name

    ...         self.age = age

    ...

    ...     def serialize(self, request):

    ...         if request.GET.get('with_age', False):

    ...             return dict(name=self.name, age=self.age)

    ...         else:

    ...             return dict(name=self.name)

    >>> @to_json('objects')

    ... def users(request):

    ...    return [User('Bob', 10), User('Anna', 12)]

    >>> resp = users(requests.get('users', { 'debug': 1 }))

    >>> print resp.status_code

    200

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    {

        "data": [

            {

                "name": "Bob"

            },

            {

                "name": "Anna"

            }

        ],

        "err": 0

    }

    You can pass extra args for serialization:

    >>> resp = users(requests.get('users',

    ...     { 'debug':1, 'with_age':1 }))

    >>> print resp.status_code

    200

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    {

        "data": [

            {

                "age": 10,

                "name": "Bob"

            },

            {

                "age": 12,

                "name": "Anna"

            }

        ],

        "err": 0

    }

    It is easy to use jsonp, just pass format=jsonp

    >>> resp = users(requests.get('users',

    ...     { 'debug':1, 'format': 'jsonp' }))

    >>> print resp.status_code

    200

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    callback({

        "data": [

            {

                "name": "Bob"

            },

            {

                "name": "Anna"

            }

        ],

        "err": 0

    });

    You can override the name of callback method using

    JSONRESPONSE_CALLBACK_NAME option or query arg callback=another_callback

    >>> resp = users(requests.get('users',

    ...     { 'debug':1, 'format': 'jsonp', 'callback': 'my_callback' }))

    >>> print resp.status_code

    200

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    my_callback({

        "data": [

            {

                "name": "Bob"

            },

            {

                "name": "Anna"

            }

        ],

        "err": 0

    });

    You can pass raise=1 to raise exceptions in debug purposes

    instead of passing info to json response

    >>> @to_json('api')

    ... def error(request):

    ...    raise Exception('Wooot!??')

    >>> resp = error(requests.get('/error',

    ...     {'debug': 1, 'raise': 1}))

    Traceback (most recent call last):

    Exception: Wooot!??

    You can wraps both methods and functions

    >>> class View(object):

    ...     @to_json('plain')

    ...     def render(self, request):

    ...         return dict(data='ok')

    ...     @to_json('api')

    ...     def render_api(self, request):

    ...         return dict(data='ok')

    >>> view = View()

    >>> resp = view.render(requests.get('/render'))

    >>> print resp.status_code

    200

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    {"data": "ok"}

    Try it one more

    >>> resp = view.render(requests.get('/render'))

    >>> print resp.status_code

    200

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    {"data": "ok"}

    Try it one more with api

    >>> resp = view.render_api(requests.get('/render'))

    >>> print resp.status_code

    200

    >>> print resp.content # doctest: +NORMALIZE_WHITESPACE

    {"data": {"data": "ok"}, "err": 0}

    You can pass custom kwargs to json.dumps,

    just give them to constructor

    >>> @to_json('plain', separators=(',  ', ':  '))

    ... def custom_kwargs(request):

    ...    return ['a', { 'b': 1 }]

    >>> resp = custom_kwargs(requests.get('/render'))

    >>> print resp.status_code

    200

    >>> print resp.content

    ["a",  {"b":  1}]

    """

    def __init__(self, serializer_type, error_code=500, **kwargs):

        """

        serializer_types:

            * api - serialize buildin objects (dict, list, etc) in strict api

            * objects - serialize list of region in strict api

            * plain - just serialize result of function, do not wrap response and do not handle exceptions

        """

        self.serializer_type = serializer_type

        self.method = None

        self.error_code=error_code

        self.kwargs = kwargs

        if 'cls' not in self.kwargs:

            self.kwargs['cls'] = DjangoJSONEncoder

    def __call__(self, f):

        @functools.wraps(f)

        def wrapper(*args, **kwargs):

            if self.method:

                return self.method(f, *args, **kwargs)

            if not args:

                if self.serializer_type == 'plain':

                    self.method = self.plain_func

                else:

                    self.method = self.api_func

            if getattr(getattr(args[0], f.__name__, None), "im_self", False):

                if self.serializer_type == 'plain':

                    self.method = self.plain_method

                else:

                    self.method = self.api_method

            else:

                if self.serializer_type == 'plain':

                    self.method = self.plain_func

                else:

                    self.method = self.api_func

            return self.method(f, *args, **kwargs)

        return wrapper

    def obj_to_response(self, req, obj):

        if self.serializer_type == 'objects':

            if isinstance(obj, Iterable):

                obj = [o.serialize(req) if obj else None for o in obj]

            elif obj:

                obj = obj.serialize(req)

            else:

                obj = None

        return { "err": 0, "data": obj }

    def err_to_response(self, err):

        if hasattr(err, "__module__"):

            err_module = err.__module__ + "."

        else:

            err_module = ""

        if hasattr(err, "owner"):

            err_module += err.owner.__name__ + "."

        err_class = err_module + err.__class__.__name__

        err_desc = str(err)

        return {

            "err": 1,

            "err_class": err_class,

            "err_desc": err_desc,

            "data": None

        }

    def render_data(self, req, data, status=200):

        debug = DEFAULT_DEBUG

        debug = debug or req.GET.get('debug', 'false').lower() in ('true', 't', '1', 'on')

        debug = debug or req.GET.get('decode', '0').lower() in ('true', 't', '1', 'on')

        format = req.GET.get('format', 'json')

        jsonp_cb = req.GET.get('callback', CALLBACK_NAME)

        content_type = "application/json"

        kwargs = dict(self.kwargs)

        if debug:

            kwargs["indent"] = 4

            kwargs["ensure_ascii"] = False

            kwargs["encoding"] = "utf8"

        plain = json.dumps(data, **kwargs)

        if format == 'jsonp':

            plain = "%s(%s);" % (jsonp_cb, plain)

            content_type = "application/javascript"

        return HttpResponse(plain, content_type="%s; charset=UTF-8" % content_type, status=status)

    def api_func(self, f, *args, **kwargs):

        return self.api(f, args[0], *args, **kwargs)

    def api_method(self, f, *args, **kwargs):

        return self.api(f, args[1], *args, **kwargs)

    def api(self, f, req, *args, **kwargs):

        logger = logging.getLogger('passerelle.jsonresponse')

        try:

            resp = f(*args, **kwargs)

            if isinstance(resp, HttpResponse):

                return resp

            data = self.obj_to_response(req, resp)

            status = 200

        except Exception as e:

            extras = {'method': req.method}

            if req.method == 'POST':

                extras.update({'body': req.body})

            logger.exception("Error occurred while processing request", extra=extras)

            if int(req.GET.get('raise', 0)):

                raise

            data = self.err_to_response(e)

            if getattr(e, 'err_code', None):

                data['err'] = e.err_code

            if getattr(e, 'http_status', None):

                status = e.http_status

            elif isinstance(e, ObjectDoesNotExist):

                status = 404

            elif isinstance(e, PermissionDenied):

                status = 403

            else:

                status = self.error_code

        return self.render_data(req, data, status)

    def plain_method(self, f, *args, **kwargs):

        data = f(*args, **kwargs)

        if isinstance(data, HttpResponse):

            return data

        return self.render_data(args[1], data)

    def plain_func(self, f, *args, **kwargs):

        data = f(*args, **kwargs)

        if isinstance(data, HttpResponse):

            return data

        return self.render_data(args[0], data)