more box fixes

[wolnelektury.git] / apps / ajaxable / utils.py

diff --git a/apps/ajaxable/utils.py b/apps/ajaxable/utils.py
index a6faafa..e32356a 100755 (executable)
--- a/apps/ajaxable/utils.py
+++ b/apps/ajaxable/utils.py
@@ -1,11 +1,16 @@
-from django.http import HttpResponse, HttpResponseRedirect
+from functools import wraps
+
+from django.http import (HttpResponse, HttpResponseRedirect,
+        HttpResponseForbidden)
 from django.shortcuts import render_to_response
 from django.template import RequestContext
+from django.utils.cache import patch_vary_headers
 from django.utils.encoding import force_unicode
 from django.utils.functional import Promise
 from django.utils.http import urlquote_plus
 from django.utils import simplejson
 from django.utils.translation import ugettext_lazy as _
+from django.views.decorators.vary import vary_on_headers
 
 
 class LazyEncoder(simplejson.JSONEncoder):
@@ -25,6 +30,28 @@ class JSONResponse(HttpResponse):
         super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
 
 
+def method_decorator(function_decorator):
+    """Converts a function decorator to a method decorator.
+
+    It just makes it ignore first argument.
+    """
+    def decorator(method):
+        @wraps(method)
+        def wrapped_method(self, *args, **kwargs):
+            def function(*fargs, **fkwargs):
+                return method(self, *fargs, **fkwargs)
+            return function_decorator(function)(*args, **kwargs)
+        return wrapped_method
+    return decorator
+
+
+def require_login(request):
+    """Return 403 if request is AJAX. Redirect to login page if not."""
+    if request.is_ajax():
+        return HttpResponseForbidden('Not logged in')
+    else:
+        return HttpResponseRedirect('/uzytkownicy/zaloguj')# next?=request.build_full_path())
+
 
 class AjaxableFormView(object):
     """Subclass this to create an ajaxable view for any form.
@@ -39,40 +66,76 @@ class AjaxableFormView(object):
     
     title = ''
     success_message = ''
+    POST_login = False
     formname = "form"
+    form_prefix = None
     full_template = "ajaxable/form_on_page.html"
 
-    def __call__(self, request):
-        """A view displaying a form, or JSON if `ajax' GET param is set."""
-        ajax = request.GET.get('ajax', False)
+    @method_decorator(vary_on_headers('X-Requested-With'))
+    def __call__(self, request, *args, **kwargs):
+        """A view displaying a form, or JSON if request is AJAX."""
+        form_args, form_kwargs = self.form_args(request, *args, **kwargs)
+        if self.form_prefix:
+            form_kwargs['prefix'] = self.form_prefix
+
         if request.method == "POST":
-            form = self.form_class(data=request.POST)
+            # do I need to be logged in?
+            if self.POST_login and not request.user.is_authenticated():
+                return require_login(request)
+
+            form_kwargs['data'] = request.POST
+            form = self.form_class(*form_args, **form_kwargs)
             if form.is_valid():
-                self.success(form, request)
+                add_args = self.success(form, request)
                 redirect = request.GET.get('next')
-                if not ajax and redirect:
+                if not request.is_ajax() and redirect:
                     return HttpResponseRedirect(urlquote_plus(
-                            redirect, safe='/?='))
+                            redirect, safe='/?=&'))
                 response_data = {'success': True, 
                     'message': self.success_message, 'redirect': redirect}
-            else:
-                response_data = {'success': False, 'errors': form.errors}
-            if ajax:
+                if add_args:
+                    response_data.update(add_args)
+            elif request.is_ajax():
+                # Form was sent with errors. Send them back.
+                if self.form_prefix:
+                    errors = {}
+                    for key, value in form.errors.items():
+                        errors["%s-%s" % (self.form_prefix, key)] = value
+                else:
+                    errors = form.errors
+                response_data = {'success': False, 'errors': errors}
+            if request.is_ajax():
                 return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
         else:
-            form = self.form_class()
+            if (self.POST_login and not request.user.is_authenticated()
+                    and not request.is_ajax()):
+                return require_login(request)
+
+            form = self.form_class(*form_args, **form_kwargs)
             response_data = None
 
-        template = self.template if ajax else self.full_template
-        return render_to_response(template, {
+        template = self.template if request.is_ajax() else self.full_template
+        context = {
                 self.formname: form, 
                 "title": self.title,
                 "submit": self.submit,
                 "response_data": response_data,
                 "ajax_template": self.template,
-            },
+                "view_args": args,
+                "view_kwargs": kwargs,
+            }
+        context.update(self.extra_context())
+        return render_to_response(template, context,
             context_instance=RequestContext(request))
 
+    def form_args(self, request, *args, **kwargs):
+        """Override to parse view args and give additional args to the form."""
+        return (), {}
+
+    def extra_context(self):
+        """Override to pass something to template."""
+        return {}
+
     def success(self, form, request):
         """What to do when the form is valid.