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1 from django.core.exceptions import ObjectDoesNotExist |
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2 from django.template import Context, RequestContext, loader |
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3 from django.contrib.contenttypes.models import ContentType |
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4 from django.contrib.sites.models import Site |
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5 from django import http |
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6 |
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7 def shortcut(request, content_type_id, object_id): |
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8 "Redirect to an object's page based on a content-type ID and an object ID." |
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9 # Look up the object, making sure it's got a get_absolute_url() function. |
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10 try: |
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11 content_type = ContentType.objects.get(pk=content_type_id) |
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12 obj = content_type.get_object_for_this_type(pk=object_id) |
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13 except ObjectDoesNotExist: |
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14 raise http.Http404, "Content type %s object %s doesn't exist" % (content_type_id, object_id) |
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15 try: |
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16 absurl = obj.get_absolute_url() |
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17 except AttributeError: |
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18 raise http.Http404, "%s objects don't have get_absolute_url() methods" % content_type.name |
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19 |
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20 # Try to figure out the object's domain, so we can do a cross-site redirect |
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21 # if necessary. |
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22 |
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23 # If the object actually defines a domain, we're done. |
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24 if absurl.startswith('http://') or absurl.startswith('https://'): |
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25 return http.HttpResponseRedirect(absurl) |
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26 |
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27 object_domain = None |
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28 |
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29 # Otherwise, we need to introspect the object's relationships for a |
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30 # relation to the Site object |
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31 opts = obj._meta |
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32 |
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33 # First, look for an many-to-many relationship to sites |
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34 for field in opts.many_to_many: |
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35 if field.rel.to is Site: |
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36 try: |
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37 object_domain = getattr(obj, field.name).all()[0].domain |
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38 except IndexError: |
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39 pass |
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40 if object_domain is not None: |
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41 break |
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42 |
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43 # Next look for a many-to-one relationship to site |
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44 if object_domain is None: |
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45 for field in obj._meta.fields: |
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46 if field.rel and field.rel.to is Site: |
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47 try: |
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48 object_domain = getattr(obj, field.name).domain |
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49 except Site.DoesNotExist: |
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50 pass |
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51 if object_domain is not None: |
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52 break |
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53 |
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54 # Fall back to the current site (if possible) |
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55 if object_domain is None: |
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56 try: |
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57 object_domain = Site.objects.get_current().domain |
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58 except Site.DoesNotExist: |
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59 pass |
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60 |
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61 # If all that malarkey found an object domain, use it; otherwise fall back |
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62 # to whatever get_absolute_url() returned. |
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63 if object_domain is not None: |
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64 protocol = request.is_secure() and 'https' or 'http' |
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65 return http.HttpResponseRedirect('%s://%s%s' % (protocol, object_domain, absurl)) |
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66 else: |
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67 return http.HttpResponseRedirect(absurl) |
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68 |
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69 def page_not_found(request, template_name='404.html'): |
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70 """ |
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71 Default 404 handler, which looks for the requested URL in the redirects |
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72 table, redirects if found, and displays 404 page if not redirected. |
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73 |
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74 Templates: `404.html` |
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75 Context: |
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76 request_path |
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77 The path of the requested URL (e.g., '/app/pages/bad_page/') |
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78 """ |
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79 t = loader.get_template(template_name) # You need to create a 404.html template. |
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80 return http.HttpResponseNotFound(t.render(RequestContext(request, {'request_path': request.path}))) |
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81 |
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82 def server_error(request, template_name='500.html'): |
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83 """ |
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84 500 error handler. |
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85 |
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86 Templates: `500.html` |
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87 Context: None |
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88 """ |
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89 t = loader.get_template(template_name) # You need to create a 500.html template. |
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90 return http.HttpResponseServerError(t.render(Context({}))) |