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Slightly changed URL to download archived shelf books.
[wolnelektury.git] / apps / catalogue / views.py
diff --git a/apps/catalogue/views.py b/apps/catalogue/views.py
index 607b4d2..de75803 100644 (file)
--- a/apps/catalogue/views.py
+++ b/apps/catalogue/views.py
@@ -1,4 +1,7 @@
 # -*- coding: utf-8 -*-
 # -*- coding: utf-8 -*-
+import tempfile
+import zipfile
+
 from django.template import RequestContext
 from django.shortcuts import render_to_response, get_object_or_404
 from django.http import HttpResponse, HttpResponseRedirect, Http404
 from django.template import RequestContext
 from django.shortcuts import render_to_response, get_object_or_404
 from django.http import HttpResponse, HttpResponseRedirect, Http404
@@ -12,6 +15,8 @@ from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
 from django.utils import simplejson
 from django.utils.functional import Promise
 from django.utils.encoding import force_unicode
 from django.utils import simplejson
 from django.utils.functional import Promise
 from django.utils.encoding import force_unicode
+from django.views.decorators import cache
+from django.core.servers.basehttp import FileWrapper
 
 from catalogue import models
 from catalogue import forms
 
 from catalogue import models
 from catalogue import forms
@@ -26,64 +31,18 @@ class LazyEncoder(simplejson.JSONEncoder):
         return obj
 
 
         return obj
 
 
-def search(request):
-    query = request.GET.get('q', '')
-    tags = request.GET.get('tags', '')
-    if tags == '':
-        tags = []
-    
-    try:
-        tag_list = models.Tag.get_tag_list(tags)
-        tag = models.Tag.objects.get(name=query)
-    except models.Tag.DoesNotExist:
-        try:
-            book = models.Book.objects.get(title=query)
-            return HttpResponseRedirect(book.get_absolute_url())
-        except models.Book.DoesNotExist:
-            return HttpResponseRedirect(reverse('catalogue.views.main_page'))
-    else:
-        tag_list.append(tag)
-        return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list', 
-            kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
-        ))
-
-
-def tags_starting_with(request):
-    try:
-        prefix = request.GET['q']
-        if len(prefix) < 2:
-            raise KeyError
-            
-        books = models.Book.objects.filter(title__icontains=prefix)
-        tags = models.Tag.objects.filter(name__icontains=prefix)
-        if request.user.is_authenticated():
-            tags = tags.filter(~Q(category='set') | Q(user=request.user))
-        else:
-            tags = tags.filter(~Q(category='set'))
-        
-        completions = [book.title for book in books] + [tag.name for tag in tags]
-
-        return HttpResponse('\n'.join(completions))    
-    
-    except KeyError:
-        return HttpResponse('')
-
-
+@cache.cache_control(must_revalidate=True, max_age=3600)
 def main_page(request):    
     if request.user.is_authenticated():
         shelves = models.Tag.objects.filter(category='set', user=request.user)
         new_set_form = forms.NewSetForm()
 def main_page(request):    
     if request.user.is_authenticated():
         shelves = models.Tag.objects.filter(category='set', user=request.user)
         new_set_form = forms.NewSetForm()
-        extra_where = '(NOT catalogue_tag.category = "set" OR catalogue_tag.user_id = %d)' % request.user.id
-    else:
-        extra_where = 'NOT catalogue_tag.category = "set"'
+    extra_where = 'NOT catalogue_tag.category = "set"'
     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
         extra={'where': ['catalogue_tag.category = "theme"'] + [extra_where]})
     categories = split_tags(tags)
     
     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
         extra={'where': ['catalogue_tag.category = "theme"'] + [extra_where]})
     categories = split_tags(tags)
     
-    print categories
     form = forms.SearchForm()
     form = forms.SearchForm()
-    
     return render_to_response('catalogue/main_page.html', locals(),
         context_instance=RequestContext(request))
 
     return render_to_response('catalogue/main_page.html', locals(),
         context_instance=RequestContext(request))
 
@@ -100,31 +59,37 @@ def book_list(request):
         context_instance=RequestContext(request))
 
 
         context_instance=RequestContext(request))
 
 
+@cache.cache_control(must_revalidate=True, max_age=3600)
 def tagged_object_list(request, tags=''):
 def tagged_object_list(request, tags=''):
+    # Prevent DoS attacks on our database
+    if len(tags.split('/')) > 6:
+        raise Http404
+        
     try:
         tags = models.Tag.get_tag_list(tags)
     except models.Tag.DoesNotExist:
         raise Http404
     
     model = models.Book
     try:
         tags = models.Tag.get_tag_list(tags)
     except models.Tag.DoesNotExist:
         raise Http404
     
     model = models.Book
-    theme_is_set = any(tag.category == 'theme' for tag in tags)
+    shelf_is_set = (len(tags) == 1 and tags[0].category == 'set')
+    theme_is_set = len([tag for tag in tags if tag.category == 'theme']) > 0
     if theme_is_set:
         model = models.Fragment
     if theme_is_set:
         model = models.Fragment
-    
-    if request.user.is_authenticated():
-        extra_where = '(NOT catalogue_tag.category = "set" OR catalogue_tag.user_id = %d)' % request.user.id
-    else:
-        extra_where = 'NOT catalogue_tag.category = "set"'
+
+    extra_where = 'NOT catalogue_tag.category = "set"'
     related_tags = models.Tag.objects.related_for_model(tags, model, counts=True, extra={'where': [extra_where]})
     categories = split_tags(related_tags)
 
     related_tags = models.Tag.objects.related_for_model(tags, model, counts=True, extra={'where': [extra_where]})
     categories = split_tags(related_tags)
 
+    if not theme_is_set:
+        model=models.Book.objects.filter(parent=None)
+    
     return newtagging_views.tagged_object_list(
         request,
         tag_model=models.Tag,
         queryset_or_model=model,
         tags=tags,
         template_name='catalogue/tagged_object_list.html',
     return newtagging_views.tagged_object_list(
         request,
         tag_model=models.Tag,
         queryset_or_model=model,
         tags=tags,
         template_name='catalogue/tagged_object_list.html',
-        extra_context = {'categories': categories },
+        extra_context = {'categories': categories, 'shelf_is_set': shelf_is_set },
     )
 
 
     )
 
 
@@ -132,44 +97,85 @@ def book_detail(request, slug):
     book = get_object_or_404(models.Book, slug=slug)
     tags = list(book.tags.filter(~Q(category='set')))
     categories = split_tags(tags)
     book = get_object_or_404(models.Book, slug=slug)
     tags = list(book.tags.filter(~Q(category='set')))
     categories = split_tags(tags)
+    book_children = book.children.all().order_by('parent_number')
     
     form = forms.SearchForm()
     return render_to_response('catalogue/book_detail.html', locals(),
         context_instance=RequestContext(request))
 
 
     
     form = forms.SearchForm()
     return render_to_response('catalogue/book_detail.html', locals(),
         context_instance=RequestContext(request))
 
 
-def logout_then_redirect(request):
-    auth.logout(request)
-    return HttpResponseRedirect(request.GET.get('next', '/'))
+def book_text(request, slug):
+    book = get_object_or_404(models.Book, slug=slug)
+    book_themes = {}
+    for fragment in book.fragments.all():
+        for theme in fragment.tags.filter(category='theme'):
+            book_themes.setdefault(theme, []).append(fragment)
+    
+    book_themes = book_themes.items()
+    book_themes.sort(key=lambda s: s[0].sort_key)
+    return render_to_response('catalogue/book_text.html', locals(),
+        context_instance=RequestContext(request))
 
 
 
 
-@require_POST
-def register(request):
-    registration_form = UserCreationForm(request.POST, prefix='registration')
-    if registration_form.is_valid():
-        user = registration_form.save()
-        user = auth.authenticate(
-            username=registration_form.cleaned_data['username'], 
-            password=registration_form.cleaned_data['password1']
-        )
-        auth.login(request, user)
-        response_data = {'success': True, 'errors': {}}
+# ==========
+# = Search =
+# ==========
+def search(request):
+    query = request.GET.get('q', '')
+    tags = request.GET.get('tags', '')
+    if tags == '':
+        tags = []
+
+    try:
+        tag_list = models.Tag.get_tag_list(tags)
+        tag = models.Tag.objects.get(name=query)
+    except models.Tag.DoesNotExist:
+        try:
+            book = models.Book.objects.get(title=query)
+            return HttpResponseRedirect(book.get_absolute_url())
+        except models.Book.DoesNotExist:
+            return HttpResponseRedirect(reverse('catalogue.views.main_page'))
     else:
     else:
-        response_data = {'success': False, 'errors': registration_form.errors}
-    return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
+        tag_list.append(tag)
+        return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list', 
+            kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
+        ))
 
 
 
 
-@require_POST
-def login(request):
-    form = AuthenticationForm(data=request.POST, prefix='login')
-    if form.is_valid():
-        auth.login(request, form.get_user())
-        response_data = {'success': True, 'errors': {}}
-    else:
-        response_data = {'success': False, 'errors': form.errors}
-    return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
+def tags_starting_with(request):
+    try:
+        prefix = request.GET['q']
+        if len(prefix) < 2:
+            raise KeyError
+
+        books = models.Book.objects.filter(title__icontains=prefix)
+        tags = models.Tag.objects.filter(name__icontains=prefix)
+        if request.user.is_authenticated():
+            tags = tags.filter(~Q(category='set') | Q(user=request.user))
+        else:
+            tags = tags.filter(~Q(category='set'))
+
+        completions = [book.title for book in books] + [tag.name for tag in tags]
+
+        return HttpResponse('\n'.join(completions))    
+
+    except KeyError:
+        return HttpResponse('')
+
+
+# ====================
+# = Shelf management =
+# ====================
+@login_required
+@cache.never_cache
+def user_shelves(request):
+    shelves = models.Tag.objects.filter(category='set', user=request.user)
+    new_set_form = forms.NewSetForm()
+    return render_to_response('catalogue/user_shelves.html', locals(),
+            context_instance=RequestContext(request))
 
 
 
 
+@cache.never_cache
 def book_sets(request, slug):
     book = get_object_or_404(models.Book, slug=slug)
     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 def book_sets(request, slug):
     book = get_object_or_404(models.Book, slug=slug)
     user_sets = models.Tag.objects.filter(category='set', user=request.user)
@@ -195,63 +201,95 @@ def book_sets(request, slug):
         context_instance=RequestContext(request))
 
 
         context_instance=RequestContext(request))
 
 
-def fragment_sets(request, id):
-    fragment = get_object_or_404(models.Fragment, pk=id)
-    user_sets = models.Tag.objects.filter(category='set', user=request.user)
-    fragment_sets = fragment.tags.filter(category='set', user=request.user)
-
-    if not request.user.is_authenticated():
-        return HttpResponse('<p>Aby zarządzać swoimi półkami, musisz się zalogować.</p>')
-
-    if request.method == 'POST':
-        form = forms.ObjectSetsForm(fragment, request.user, request.POST)
-        if form.is_valid():
-            fragment.tags = ([models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']] +
-                list(fragment.tags.filter(~Q(category='set') | ~Q(user=request.user))))
-            if request.is_ajax():
-                return HttpResponse('<p>Półki zostały zapisane.</p>')
-            else:
-                return HttpResponseRedirect('/')
-    else:
-        form = forms.ObjectSetsForm(fragment, request.user)
-        new_set_form = forms.NewSetForm()
-
-    return render_to_response('catalogue/fragment_sets.html', locals(),
-        context_instance=RequestContext(request))
+@cache.cache_control(must_revalidate=True, max_age=1800)
+def download_shelf(request, slug):
+    """"
+    Create a ZIP archive on disk and transmit it in chunks of 8KB,
+    without loading the whole file into memory. A similar approach can
+    be used for large dynamic PDF files.                                        
+    """
+    shelf = get_object_or_404(models.Tag, slug=slug, category='set')
+    
+    # Create a ZIP archive
+    temp = tempfile.TemporaryFile()
+    archive = zipfile.ZipFile(temp, 'w', zipfile.ZIP_DEFLATED)
+    for book in models.Book.tagged.with_all(shelf):
+        filename = book.html_file.path
+        archive.write(filename, str('%s.html' % book.slug))
+    archive.close()
+    
+    wrapper = FileWrapper(temp)
+    response = HttpResponse(wrapper, content_type='application/zip')
+    response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.slug
+    response['Content-Length'] = temp.tell()
+    temp.seek(0)
+    return response
 
 
 @login_required
 @require_POST
 
 
 @login_required
 @require_POST
+@cache.never_cache
 def new_set(request):
     new_set_form = forms.NewSetForm(request.POST)
     if new_set_form.is_valid():
         new_set = new_set_form.save(request.user)
 def new_set(request):
     new_set_form = forms.NewSetForm(request.POST)
     if new_set_form.is_valid():
         new_set = new_set_form.save(request.user)
-        
+
         if request.is_ajax():
             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
         else:
             return HttpResponseRedirect('/')
         if request.is_ajax():
             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
         else:
             return HttpResponseRedirect('/')
-    
+
     return render_to_response('catalogue/book_sets.html', locals(),
             context_instance=RequestContext(request))
 
 
 @login_required
 @require_POST
     return render_to_response('catalogue/book_sets.html', locals(),
             context_instance=RequestContext(request))
 
 
 @login_required
 @require_POST
+@cache.never_cache
 def delete_shelf(request, slug):
     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
     user_set.delete()
 def delete_shelf(request, slug):
     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
     user_set.delete()
-    
+
     if request.is_ajax():
         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
     else:
         return HttpResponseRedirect('/')
 
 
     if request.is_ajax():
         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
     else:
         return HttpResponseRedirect('/')
 
 
-@login_required
-def user_shelves(request):
-    shelves = models.Tag.objects.filter(category='set', user=request.user)
-    new_set_form = forms.NewSetForm()
-    return render_to_response('catalogue/user_shelves.html', locals(),
-            context_instance=RequestContext(request))
+# ==================
+# = Authentication =
+# ==================
+@require_POST
+@cache.never_cache
+def login(request):
+    form = AuthenticationForm(data=request.POST, prefix='login')
+    if form.is_valid():
+        auth.login(request, form.get_user())
+        response_data = {'success': True, 'errors': {}}
+    else:
+        response_data = {'success': False, 'errors': form.errors}
+    return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
+
+
+@require_POST
+@cache.never_cache
+def register(request):
+    registration_form = UserCreationForm(request.POST, prefix='registration')
+    if registration_form.is_valid():
+        user = registration_form.save()
+        user = auth.authenticate(
+            username=registration_form.cleaned_data['username'], 
+            password=registration_form.cleaned_data['password1']
+        )
+        auth.login(request, user)
+        response_data = {'success': True, 'errors': {}}
+    else:
+        response_data = {'success': False, 'errors': registration_form.errors}
+    return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
+
+
+@cache.never_cache
+def logout_then_redirect(request):
+    auth.logout(request)
+    return HttpResponseRedirect(request.GET.get('next', '/'))