Added document preview link and download link

apps/common/templates/generic_list.html

@@ -5,4 +5,22 @@
 
 {% block content %}
     {% include 'generic_list_subtemplate.html' %}
+
+    {% for subtemplate in subtemplates_dict %}
+    {% with subtemplate.title as title %}
+    {% with subtemplate.object_list as object_list %}
+    {% with subtemplate.extra_columns as extra_columns %}
+    {% with subtemplate.hide_object as hide_object %}
+    {% with subtemplate.main_object as main_object %}
+    {% with subtemplate.hide_link as hide_link %}
+        {% include subtemplate.name %}
+    {% endwith %}
+    {% endwith %}
+    {% endwith %}
+    {% endwith %}
+    {% endwith %}
+    {% endwith %}
+    {% endfor %}
+
 {% endblock %}
+

apps/documents/__init__.py

@@ -11,10 +11,12 @@ document_create_multiple = {'text':_('upload multiple documents'), 'view':'docum
 document_view = {'text':_('details'), 'view':'document_view', 'args':'object.id', 'famfam':'page'}
 document_delete = {'text':_('delete'), 'view':'document_delete', 'args':'object.id', 'famfam':'page_delete'}
 document_edit = {'text':_('edit'), 'view':'document_edit', 'args':'object.id', 'famfam':'page_edit'}
+document_preview = {'text':_('preview'), 'class':'fancybox', 'view':'document_preview', 'args':'object.id', 'famfam':'magnifier'}
+document_download = {'text':_('download'), 'view':'document_download', 'args':'object.id', 'famfam':'page_save'}
 
-staging_file_preview = {'class':'fancybox', 'text':_('preview'), 'view':'staging_file_preview', 'args':'object.id', 'famfam':'drive_magnify'}
+staging_file_preview = {'text':_('preview'), 'class':'fancybox', 'view':'staging_file_preview', 'args':'object.id', 'famfam':'drive_magnify'}
 
-register_links(Document, [document_view, document_edit, document_delete])
+register_links(Document, [document_view, document_edit, document_delete, document_preview, document_download])
 register_links(Document, [document_list, document_create, document_create_multiple], menu_name='sidebar')
 register_links(['document_list', 'document_create', 'document_create_multiple', 'upload_document_with_type', 'upload_multiple_documents_with_type'], [document_list, document_create, document_create_multiple], menu_name='sidebar')
 

apps/documents/conf/settings.py

@@ -23,7 +23,6 @@ USE_STAGING_DIRECTORY = getattr(settings, 'DOCUMENTS_USE_STAGING_DIRECTORY', Fal
 STAGING_DIRECTORY = getattr(settings, 'DOCUMENTS_STAGING_DIRECTORY', u'/tmp/mayan/staging')
 DELETE_STAGING_FILE_AFTER_UPLOAD = getattr(settings, 'DOCUMENTS_DELETE_STAGING_FILE_AFTER_UPLOAD', False)
 STAGING_FILES_PREVIEW_SIZE = getattr(settings, 'DOCUMENTS_STAGING_FILES_PREVIEW_SIZE', '640x480')
-
 DELETE_LOCAL_ORIGINAL = getattr(settings, 'DOCUMENTS_DELETE_LOCAL_ORIGINAL', False)
 # Saving
 CHECKSUM_FUNCTION = getattr(settings, 'DOCUMENTS_CHECKSUM_FUNCTION', lambda x: hashlib.sha256(x).hexdigest())
@@ -31,6 +30,8 @@ UUID_FUNCTION = getattr(settings, 'DOCUMENTS_UUID_FUNTION', lambda:unicode(uuid.
 # Storage
 STORAGE_BACKEND = getattr(settings, 'DOCUMENTS_STORAGE_BACKEND', DocumentStorage)
 STORAGE_DIRECTORY_NAME = getattr(settings, 'DOCUMENTS_STORAGE_DIRECTORY_NAME', 'documents')
+# Usage
+PREVIEW_SIZE = getattr(settings, 'DOCUMENTS_PREVIEW_SIZE', '640x480')
 # Serving
 FILESYSTEM_FILESERVING_ENABLE = getattr(settings, 'DOCUMENTS_FILESYSTEM_FILESERVING_ENABLE', True)
 FILESYSTEM_FILESERVING_PATH = getattr(settings, 'DOCUMENTS_FILESERVING_PATH', u'/tmp/mayan/documents')

apps/documents/convert.py

@@ -6,6 +6,19 @@ import tempfile
 #from django.core.files.base import File
 from documents.conf.settings import TEMPORARY_DIRECTORY
 
+
+def in_cache(input_filepath, size, page=0, format='jpg'):
+    temp_directory = TEMPORARY_DIRECTORY if TEMPORARY_DIRECTORY else tempfile.mkdtemp()
+    temp_filename, separator = os.path.splitext(os.path.basename(input_filepath))
+    temp_path = os.path.join(temp_directory, temp_filename)
+    output_arg = '%s_%s%s%s' % (temp_path, size, os.extsep, format)
+    input_arg = '%s[%s]' % (input_filepath, page)
+    if os.path.exists(output_arg):
+        return output_arg
+    else:
+        return None
+    
+    
 def convert(input_filepath, size, cache=True, page=0, format='jpg'):
     temp_directory = TEMPORARY_DIRECTORY if TEMPORARY_DIRECTORY else tempfile.mkdtemp()
     #TODO: generate output file using lightweight hash function on

apps/documents/models.py

@@ -73,6 +73,9 @@ class Document(models.Model):
         
     def __unicode__(self):
         return '%s.%s' % (self.file_filename, self.file_extension)
+      
+    def get_fullname(self):
+        return os.extsep.join([self.file_filename, self.file_extension])
         
     @models.permalink
     def get_absolute_url(self):

apps/documents/urls.py

@@ -12,6 +12,8 @@ urlpatterns = patterns('documents.views',
     url(r'^document/(?P<document_id>\d+)/$', 'document_view', (), 'document_view'),
     url(r'^document/(?P<document_id>\d+)/delete/$', 'document_delete', (), 'document_delete'),
     url(r'^document/(?P<document_id>\d+)/edit/$', 'document_edit', (), 'document_edit'),
+    url(r'^document/(?P<document_id>\d+)/preview/$', 'document_preview', (), 'document_preview'),
+    url(r'^document/(?P<document_id>\d+)/download/$', 'document_download', (), 'document_download'),
     
     url(r'^staging_file/(?P<staging_file_id>\w+)/preview/$', 'staging_file_preview', (), 'staging_file_preview'),
 

apps/documents/utils.py

@@ -0,0 +1,61 @@
+import os
+import tempfile
+
+from documents.conf.settings import TEMPORARY_DIRECTORY
+
+           
+#http://stackoverflow.com/questions/123198/how-do-i-copy-a-file-in-python
+def copyfile(source, dest, buffer_size=1024*1024):
+    """
+    Copy a file from source to dest. source and dest
+    can either be strings or any object with a read or
+    write method, like StringIO for example.
+    """
+    if not hasattr(source, 'read'):
+        source = open(source, 'rb')
+    if not hasattr(dest, 'write'):
+        dest = open(dest, 'wb')
+
+    while 1:
+        copy_buffer = source.read(buffer_size)
+        if copy_buffer:
+            dest.write(copy_buffer)
+        else:
+            break
+
+    source.close()
+    dest.close()
+
+
+def from_descriptor_to_tempfile(input_descriptor, filename, buffer_size=1024*1024):
+    path = os.path.join(TEMPORARY_DIRECTORY, filename)
+    
+    output_descriptor = open(path, 'wb')
+    
+    while 1:
+        copy_buffer = input_descriptor.read(buffer_size)
+        if copy_buffer:
+            output_descriptor.write(copy_buffer)
+        else:
+            break
+
+    input_descriptor.close()
+    output_descriptor.close()
+    return path
+
+
+
+def from_descriptor_to_new_tempfile(input_descriptor, buffer_size=1024*1024):
+    output_descriptor, tmp_filename = tempfile.mkstemp()
+    
+    while 1:
+        copy_buffer = input_descriptor.read(buffer_size)
+        if copy_buffer:
+            #output_descriptor.write(copy_buffer)
+            os.write(output_descriptor, copy_buffer)
+        else:
+            break
+
+    input_descriptor.close()
+    os.close(output_descriptor)
+    return tmp_filename

apps/documents/views.py

@@ -1,4 +1,3 @@
-from urlparse import urlparse
 from urllib import unquote_plus
 
 from django.utils.translation import ugettext as _
@@ -14,7 +13,8 @@ from django.core.files.base import File
 
 from filetransfers.api import serve_file
 
-from convert import convert
+from convert import convert, in_cache
+from utils import from_descriptor_to_tempfile
 
 from models import Document, DocumentMetadata, DocumentType, MetadataType
 from forms import DocumentTypeSelectForm, DocumentCreateWizard, \
@@ -27,6 +27,7 @@ from documents.conf.settings import DELETE_STAGING_FILE_AFTER_UPLOAD
 from documents.conf.settings import USE_STAGING_DIRECTORY
 from documents.conf.settings import FILESYSTEM_FILESERVING_ENABLE
 from documents.conf.settings import STAGING_FILES_PREVIEW_SIZE
+from documents.conf.settings import PREVIEW_SIZE
 
 def document_list(request):
     return object_list(
@@ -39,10 +40,14 @@ def document_list(request):
                 {'name':_(u'mimetype'), 'attribute':'file_mimetype'},
                 {'name':_(u'added'), 'attribute':lambda x: x.date_added.date()},
             ],
+            'subtemplates_dict':[
+                {
+                    'name':'fancybox.html',
+                },
+            ],
         },
     )
 
-
 def document_create(request, multiple=True):
     MetadataFormSet = formset_factory(MetadataForm, extra=0)
     wizard = DocumentCreateWizard(form_list=[DocumentTypeSelectForm, MetadataFormSet], multiple=multiple)
@@ -198,6 +203,9 @@ def document_view(request, document_id):
     ])
     
     subtemplates_dict = [
+            {
+                'name':'fancybox.html',
+            },    
             {
                 'name':'generic_list_subtemplate.html',
                 'title':_(u'metadata'),
@@ -274,6 +282,37 @@ def document_edit(request, document_id):
     }, context_instance=RequestContext(request))
 
 
+def document_preview(request, document_id):
+    document = get_object_or_404(Document, pk=document_id)
+    
+    filepath = in_cache(document.uuid, PREVIEW_SIZE)
+   
+    if filepath:
+        return serve_file(request, File(file=open(filepath, 'r')))
+    else:
+        try:
+            document.file.open()
+            desc = document.file.storage.open(document.file.path)
+            filepath = from_descriptor_to_tempfile(desc, document.uuid)
+            output_file = convert(filepath, PREVIEW_SIZE)
+            return serve_file(request, File(file=open(output_file, 'r')))
+        except Exception, e:
+            #messages.error(request, e)
+            return HttpResponse(e)
+    
+        
+        
+def document_download(request, document_id):
+    document = get_object_or_404(Document, pk=document_id)
+    try:
+        #Test permissions and trigger exception
+        document.file.open()
+        return serve_file(request, document.file, save_as=document.get_fullname())
+    except Exception, e:
+        messages.error(request, e)
+        return HttpResponseRedirect(request.META['HTTP_REFERER'])
+
+
 def staging_file_preview(request, staging_file_id):
     try:
         filepath = StagingFile.get(staging_file_id).filepath

settings.py

@@ -180,6 +180,8 @@ LOGIN_EXEMPT_URLS = (
 #DOCUMENTS_UUID_FUNCTION = lambda:unicode(uuid.uuid4())
 # Storage
 #DOCUMENTS_STORAGE_DIRECTORY_NAME = 'documents'
+# Usage
+#DOCUMENTS_PREVIEW_SIZE = '640x480'
 # Serving
 #DOCUMENTS_FILESYSTEM_FILESERVING_ENABLE = True
 #DOCUMENTS_FILESYSTEM_FILESERVING_PATH = u'/tmp/mayan/documents'