Now importing a book that already exists in our database doesn't duplicate it's fragm...

[wolnelektury.git] / apps / catalogue / views.py

diff --git a/apps/catalogue/views.py b/apps/catalogue/views.py
index 45dc7a0..257d472 100644 (file)
--- a/apps/catalogue/views.py
+++ b/apps/catalogue/views.py
@@ -1,4 +1,7 @@
 # -*- 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
@@ -116,54 +119,56 @@ def book_text(request, slug):
 # ==========
 # = 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'))
+def _tags_starting_with(prefix, user):
+    books = models.Book.objects.filter(title__icontains=prefix)
+    tags = models.Tag.objects.filter(name__icontains=prefix)
+    if user.is_authenticated():
+        tags = tags.filter(~Q(category='set') | Q(user=user))
     else:
-        tag_list.append(tag)
-        return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list', 
-            kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
-        ))
+        tags = tags.filter(~Q(category='set'))
 
+    return list(books) + list(tags)
+        
 
-def tags_starting_with(request):
+def search(request):
+    tags = request.GET.get('tags', '')
+    prefix = request.GET.get('q', '')
+    # Prefix must have at least 2 characters
+    if len(prefix) < 2:
+        return HttpResponse('')
+    
     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))
+        tag_list = models.Tag.get_tag_list(tags)
+    except:
+        tag_list = []
+    
+    result = _tags_starting_with(prefix, request.user)
+    if len(result) > 0:
+        tag = result[0]
+        if isinstance(tag, models.Book):
+            return HttpResponseRedirect(tag.get_absolute_url())
         else:
-            tags = tags.filter(~Q(category='set'))
-
-        completions = [book.title for book in books] + [tag.name for tag in tags]
+            tag_list.append(tag)
+        
+    return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list', 
+        kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
+    ))
 
-        return HttpResponse('\n'.join(completions))    
 
-    except KeyError:
+def tags_starting_with(request):
+    prefix = request.GET['q']
+    # Prefix must have at least 2 characters
+    if len(prefix) < 2:
         return HttpResponse('')
+    
+    return HttpResponse('\n'.join(tag.name for tag in _tags_starting_with(prefix, request.user)))
 
 
 # ====================
 # = Shelf management =
 # ====================
 @login_required
-@cache.cache_control(must_revalidate=True, max_age=3600, private=True)
+@cache.never_cache
 def user_shelves(request):
     shelves = models.Tag.objects.filter(category='set', user=request.user)
     new_set_form = forms.NewSetForm()
@@ -171,7 +176,7 @@ def user_shelves(request):
             context_instance=RequestContext(request))
 
 
-@cache.cache_control(must_revalidate=True, max_age=3600, private=True)
+@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)
@@ -197,6 +202,39 @@ def book_sets(request, slug):
         context_instance=RequestContext(request))
 
 
+@cache.never_cache
+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 = temp = tempfile.TemporaryFile()
+    archive = zipfile.ZipFile(temp, 'w')
+    for book in models.Book.tagged.with_all(shelf):
+        if book.pdf_file:
+            filename = book.pdf_file.path
+            archive.write(filename, str('%s.pdf' % book.slug))
+        if book.odt_file:
+            filename = book.odt_file.path
+            archive.write(filename, str('%s.odt' % book.slug))
+        if book.txt_file:
+            filename = book.txt_file.path
+            archive.write(filename, str('%s.txt' % book.slug))
+    archive.close()
+    
+    response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
+    response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
+    response['Content-Length'] = temp.tell()
+    
+    temp.seek(0)
+    response.write(temp.read())
+    return response
+
+
 @login_required
 @require_POST
 @cache.never_cache