author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 06 Jan 2009 21:21:09 +0000 | |
changeset 770 | eb2e69312953 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Formtools Preview application. |
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""" |
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import cPickle as pickle |
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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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from django.utils.hashcompat import md5_constructor |
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from django.contrib.formtools.utils import security_hash |
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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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|
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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 HttpRequest and Form instances. |
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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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return security_hash(request, form) |
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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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117 |
HttpResponseRedirect. |
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""" |
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raise NotImplementedError('You must define a done() method on your %s subclass.' % self.__class__.__name__) |