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https://github.com/samuraisam/django-json-rpc

JSON-RPC Implementation for Django
https://github.com/samuraisam/django-json-rpc

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JSON-RPC Implementation for Django

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README 

        
Django JSON-RPC

===============



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A basic JSON-RPC Implementation for your Django-powered sites.



Features:



* Simple, pythonic API

* Support for Django authentication

* Support for all official [Django Python/Version](https://docs.djangoproject.com/en/1.8/faq/install/#what-python-version-can-i-use-with-django) combinations

* Supports JSON-RPC 1.0, 1.1, 1.2 and 2.0 Spec

* Proxy to test your JSON Service

* Run-time type checking

* Graphical JSON-RPC browser and web console

* Provides `system.describe`



The basic API:



**myproj/myapp/views.py**



    from jsonrpc import jsonrpc_method



    @jsonrpc_method('myapp.sayHello')

    def whats_the_time(request, name='Lester'):

      return "Hello %s" % name



    @jsonrpc_method('myapp.gimmeThat', authenticated=True)

    def something_special(request, secret_data):

      return {'sauce': ['authenticated', 'sauce']}



**myproj/urls.py**



    from django.conf.urls.defaults import *

    from jsonrpc import jsonrpc_site

    import myproj.myapp.views # you must import the views that need connected



    urlpatterns = patterns('',

      url(r'^json/browse/', 'jsonrpc.views.browse', name="jsonrpc_browser"), # for the graphical browser/web console only, omissible

      url(r'^json/', jsonrpc_site.dispatch, name="jsonrpc_mountpoint"),

      (r'^json/(?P[a-zA-Z0-9.]+)$', jsonrpc_site.dispatch) # for HTTP GET only, also omissible

    )



**To test your service:**

You can test your service using the provided graphical browser and console,

available at http://YOUR_URL/json/browse/ (if using the url patterns from above) or with the included ServiceProxy:



    >>> from jsonrpc.proxy import ServiceProxy



    >>> s = ServiceProxy('http://localhost:8080/json/')



    >>> s.myapp.sayHello('Sam')

    {u'error': None, u'id': u'jsonrpc', u'result': u'Hello Sam'}



    >>> s.myapp.gimmeThat('username', 'password', 'test data')

    {u'error': None, u'id': u'jsonrpc', u'result': {u'sauce': [u'authenticated', u'sauce']}}



We add the `jsonrpc_version` variable to the request object. It be either '1.0', '1.1' or '2.0'. Arg.



Guide

=====



### Adding JSON-RPC to your application



#### 1. Install django-json-rpc



    git clone git://github.com/samuraisam/django-json-rpc.git

    cd django-json-rpc

    python setup.py install



    # Add 'jsonrpc' to your INSTALLED_APPS in your settings.py file



#### 2. Write JSON-RPC methods



    from jsonrpc import jsonrpc_method



    @jsonrpc_method('app.register')

    def register_user(request, username, password):

      u = User.objects.create_user(username, '[email protected]', password)

      u.save()

      return u.__dict__



    @jsonrpc_method('app.change_password', authenticated=True)

    def change_password(request, new_password):

      request.user.set_password(new_password)

      request.user.save()

      return u.__dict__



#### 3. Add the JSON-RPC mountpoint and import your views



    from jsonrpc import jsonrpc_site

    import app.views



    urlpatterns = patterns('',

      url(r'^json/$', jsonrpc_site.dispatch, name='jsonrpc_mountpoint'),

      # ... among your other URLs

    )



### The jsonrpc_method decorator

Wraps a function turns it into a json-rpc method. Adds several attributes to the function speific to the JSON-RPC machinery and adds it to the default jsonrpc_site if one isn't provided. You must import the module containing these functions in your urls.py.



`jsonrpc.jsonrpc_method(name, authenticated=False, safe=False, validate=False)`

    

  • 

    `name`
    


    The name of your method. IE: `namespace.methodName`

    • 

  • 

    `authenticated=False`
    


    Adds `username` and `password` arguments to the beginning of your method if the user hasn't already been authenticated. These will be used to authenticate the user against `django.contrib.authenticate` If you use HTTP auth or other authentication middleware, `username` and `password` will not be added, and this method will only check against `request.user.is_authenticated`.
    


    You may pass a callablle to replace `django.contrib.auth.authenticate` as the authentication method. It must return either a User or `None` and take the keyword arguments `username` and `password`.

    • 

  • 

    `safe=False`
    


    Designates whether or not your method may be accessed by HTTP GET. By default this is turned off.

    • 

  • 

    `validate=False`
    


    Validates the arguments passed to your method based on type information provided in the signature. Supply type information by including types in your method declaration. Like so:
    


          @jsonrpc_method('myapp.specialSauce(Array, String)', validate=True)

          def special_sauce(self, ingredients, instructions):

            return SpecialSauce(ingredients, instructions)
    


    Calls to `myapp.specialSauce` will now check each arguments type before calling `special_sauce`, throwing an `InvalidParamsError` when it encounters a discrepancy. This can significantly reduce the amount of code required to write JSON-RPC services.
    


    *NOTE:* Type checking is only available on Python versions 2.6 or greater.

    • 

  • 

    `site=default_site`
    


    Defines which site the jsonrpc method will be added to. Can be any

    object that provides a `register(name, func)` method.

    • 




### Using type checking on methods (Python 2.6 or greater)

When writing web services you often end up manually checking the types of parameters passed. django-json-rpc provides a way to eliminate much of that code by specifying the types in your method signature. As specified in the JSON-RPC spec the available types are `Object Array Number Boolean String Nil ` and `Any` meaning any type.



      @jsonrpc_method('app.addStrings(arg1=String, arg2=String) -> String', validate=True)

      def add_strings(request, arg1, arg2):

        return arg1 + arg2



However contrived this example, a lot of extra information about our function is available. The `system.describe` method will automatically be able to provide more information about the parameters and return type. Provide `validate=True` to the `jsonrpc_method` decorator and you can be guaranteed to receive two string objects when `add_strings` is called.



**Note:** Return type information is used only for reference, return value types are not checked.



Types can be specified a number of ways, the following are all equivalent:



      # using JSON types:

      @jsonrpc_method('app.findSelection(query=Object, limit=Number)')



      # using Python types:

      @jsonrpc_method('app.findSelection(query=dict, limit=int)')



      # with mixed keyword parameters

      @jsonrpc_method('app.findSelection(dict, limit=int)')



      # with no keyword parameters

      @jsonrpc_method('app.findSelection(dict, int)')



      # with a return value

      @jsonrpc_method('app.findSelection(dict, int) -> list')



### Using the browser

To access the browser simply add another entry to your `urls.py` file, before the json dispatch one. Make sure to include the name attribute of each url.



    urlpatterns = patterns('',

      ...

      url(r'^json/browse/$', 'jsonrpc.views.browse', name='jsonrpc_browser')

      url(r'^json/', jsonrpc_site.dispatch, name="jsonrpc_mountpoint"),

      ...

    )



### Enabling HTTP-GET

JSON-RPC 1.1 includes support for methods which are accessible by HTTP GET which it calls idempotent. Add the following to your `urls.py` file to set up the GET URL.



    urlpatterns += patterns('',

      (r'^json/(?P[a-zA-Z0-9.-_]+)$', jsonrpc_site.dispatch),

    )



Each method that you want to be accessible by HTTP GET must also be marked safe in the method decorator:



    @jsonrpc_method('app.trimTails(String)', safe=True)

    def trim_tails(request, arg1):

      return arg1[:5]



You can then call the method by loading `/jsonrpc/app.trimTails?arg1=omgnowai`



### Using authentication on methods

There is no specific support for authentication in the JSON-RPC spec beyond whatever authentication the transport offers. To restrict access to methods to registered users provide `authenticated=True` to the method decorator. Doing so will add two arguments to the beginning of your method signature, `username` and `password` (and always in that order). By default, the credentials are authenticated against the builtin `User` database but any method can be used.



    @jsonrpc_method('app.thupertheecrit', authenticated=True)

    def thupertheecrit(request, value):

      p = request.user.get_profile()

      p.theecrit = value

      p.save()

      return p.__dict__



Using your own authentication method:



    def mah_authenticate(username, password):

      return CustomUserClass.authenticate(username, password)



    @jsonrpc_method('app.thupertheecrit', authenticated=mah_authenticate)

    def thupertheecrit(request, value):

      request.user.theecrit = value

      request.user.save()

      return request.user.__dict__



In case authentication is handled before your method is called, like in some middleware, providing `authenticated=True` to the method decorator will only check that `request.user` is authenticated and won't add any parameters to the beginning of your method.