app/django/contrib/formtools/preview.py
author Todd Larsen <tlarsen@google.com>
Thu, 25 Sep 2008 17:17:11 +0000
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child 323 ff1a9aa48cfd
permissions -rw-r--r--
A key_name controller module to collect all of the name...() functions that compose Model entity key names, plus some minor changes to other controller modules to illustrate the proposed use. Patch by: Todd Larsen Review by: Pawel Solyga Review URL: http://codereviews.googleopensourceprograms.com/804 Review URL: http://codereviews.googleopensourceprograms.com/804
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"""
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Formtools Preview application.
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"""
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from django.conf import settings
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from django.http import Http404
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from django.shortcuts import render_to_response
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from django.template.context import RequestContext
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import cPickle as pickle
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import md5
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AUTO_ID = 'formtools_%s' # Each form here uses this as its auto_id parameter.
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class FormPreview(object):
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    preview_template = 'formtools/preview.html'
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    form_template = 'formtools/form.html'
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    # METHODS SUBCLASSES SHOULDN'T OVERRIDE ###################################
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    def __init__(self, form):
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        # form should be a Form class, not an instance.
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        self.form, self.state = form, {}
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    def __call__(self, request, *args, **kwargs):
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        stage = {'1': 'preview', '2': 'post'}.get(request.POST.get(self.unused_name('stage')), 'preview')
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        self.parse_params(*args, **kwargs)
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        try:
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            method = getattr(self, stage + '_' + request.method.lower())
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        except AttributeError:
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            raise Http404
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        return method(request)
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    def unused_name(self, name):
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        """
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        Given a first-choice name, adds an underscore to the name until it
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        reaches a name that isn't claimed by any field in the form.
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        This is calculated rather than being hard-coded so that no field names
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        are off-limits for use in the form.
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        """
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        while 1:
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            try:
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                f = self.form.base_fields[name]
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            except KeyError:
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                break # This field name isn't being used by the form.
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            name += '_'
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        return name
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    def preview_get(self, request):
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        "Displays the form"
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        f = self.form(auto_id=AUTO_ID)
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        return render_to_response(self.form_template,
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            {'form': f, 'stage_field': self.unused_name('stage'), 'state': self.state},
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            context_instance=RequestContext(request))
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    def preview_post(self, request):
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        "Validates the POST data. If valid, displays the preview page. Else, redisplays form."
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        f = self.form(request.POST, auto_id=AUTO_ID)
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        context = {'form': f, 'stage_field': self.unused_name('stage'), 'state': self.state}
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        if f.is_valid():
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            context['hash_field'] = self.unused_name('hash')
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            context['hash_value'] = self.security_hash(request, f)
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            return render_to_response(self.preview_template, context, context_instance=RequestContext(request))
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        else:
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            return render_to_response(self.form_template, context, context_instance=RequestContext(request))
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    def post_post(self, request):
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        "Validates the POST data. If valid, calls done(). Else, redisplays form."
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        f = self.form(request.POST, auto_id=AUTO_ID)
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        if f.is_valid():
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            if self.security_hash(request, f) != request.POST.get(self.unused_name('hash')):
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                return self.failed_hash(request) # Security hash failed.
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            return self.done(request, f.cleaned_data)
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        else:
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            return render_to_response(self.form_template,
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                {'form': f, 'stage_field': self.unused_name('stage'), 'state': self.state},
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                context_instance=RequestContext(request))
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    # METHODS SUBCLASSES MIGHT OVERRIDE IF APPROPRIATE ########################
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    def parse_params(self, *args, **kwargs):
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        """
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        Given captured args and kwargs from the URLconf, saves something in
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        self.state and/or raises Http404 if necessary.
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        For example, this URLconf captures a user_id variable:
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            (r'^contact/(?P<user_id>\d{1,6})/$', MyFormPreview(MyForm)),
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        In this case, the kwargs variable in parse_params would be
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        {'user_id': 32} for a request to '/contact/32/'. You can use that
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        user_id to make sure it's a valid user and/or save it for later, for
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        use in done().
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        """
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        pass
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    def security_hash(self, request, form):
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        """
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        Calculates the security hash for the given Form instance.
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        This creates a list of the form field names/values in a deterministic
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        order, pickles the result with the SECRET_KEY setting and takes an md5
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        hash of that.
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        Subclasses may want to take into account request-specific information
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        such as the IP address.
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        """
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        data = [(bf.name, bf.data or '') for bf in form] + [settings.SECRET_KEY]
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        # Use HIGHEST_PROTOCOL because it's the most efficient. It requires
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        # Python 2.3, but Django requires 2.3 anyway, so that's OK.
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        pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)
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        return md5.new(pickled).hexdigest()
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    def failed_hash(self, request):
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        "Returns an HttpResponse in the case of an invalid security hash."
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        return self.preview_post(request)
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    # METHODS SUBCLASSES MUST OVERRIDE ########################################
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    def done(self, request, cleaned_data):
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        """
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        Does something with the cleaned_data and returns an
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        HttpResponseRedirect.
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        """
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        raise NotImplementedError('You must define a done() method on your %s subclass.' % self.__class__.__name__)