Added staging file previews support

apps/documents/__init__.py

@@ -12,10 +12,14 @@ document_view = {'text':_('details'), 'view':'document_view', 'args':'object.id'
 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'}
 
+staging_file_preview = {'class':'fancybox', 'text':_('preview'), 'view':'staging_file_preview', 'args':'object.id', 'famfam':'drive_magnify'}
+
 register_links(Document, [document_view, document_edit, document_delete])
 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')
 
+register_links(StagingFile, [staging_file_preview])
+
 
 register_menu([
     {'text':_('documents'), 'view':'document_list', 'links':[

apps/documents/conf/settings.py

@@ -22,6 +22,8 @@ AVAILABLE_MODELS = getattr(settings, 'DOCUMENTS_METADATA_AVAILABLE_MODELS', defa
 USE_STAGING_DIRECTORY = getattr(settings, 'DOCUMENTS_USE_STAGING_DIRECTORY', False)
 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())
@@ -34,3 +36,5 @@ FILESYSTEM_FILESERVING_ENABLE = getattr(settings, 'DOCUMENTS_FILESYSTEM_FILESERV
 FILESYSTEM_FILESERVING_PATH = getattr(settings, 'DOCUMENTS_FILESERVING_PATH', u'/tmp/mayan/documents')
 FILESYSTEM_SLUGIFY_PATHS = getattr(settings, 'DOCUMENTS_SLUGIFY_PATHS', False)
 FILESYSTEM_MAX_RENAME_COUNT = getattr(settings, 'DOCUMENTS_FILESYSTEM_MAX_RENAME_COUNT', 200)
+#misc
+TEMPORARY_DIRECTORY = getattr(settings, 'DOCUMENTS_TEMPORARY_DIRECTORY', u'/tmp')

apps/documents/convert.py

@@ -0,0 +1,29 @@
+import os
+
+import subprocess
+import tempfile
+
+#from django.core.files.base import File
+from documents.conf.settings import TEMPORARY_DIRECTORY
+
+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
+    #file name or file content
+    #descriptor, temp_filepath = tempfile.mkstemp()
+
+    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
+        
+    #TODO: Check mimetype and use corresponding utility
+    convert = subprocess.Popen(['convert', input_arg, '-resize', size,  output_arg])
+    return_code = convert.wait()
+    if return_code:
+        raise Exception
+    #TODO: check return code & messages
+    #TODO: Timeout & kill child
+    return output_arg

apps/documents/templates/fancybox.html

@@ -0,0 +1,15 @@
+<link rel="stylesheet" href="{{ MEDIA_URL }}packages/jquery.fancybox-1.3.4/fancybox/jquery.fancybox-1.3.4.css" type="text/css" media="screen" />
+<script type="text/javascript" src="{{ MEDIA_URL }}packages/jquery.fancybox-1.3.4/fancybox/jquery.fancybox-1.3.4.pack.js"></script>
+<script type="text/javascript" src="{{ MEDIA_URL }}packages/jquery.fancybox-1.3.4/fancybox/jquery.easing-1.3.pack.js"></script>
+<script type="text/javascript">
+    jQuery(document).ready(function() {
+        $("a.fancybox").fancybox({
+        'titleShow'     : false,
+        'transitionIn'  : 'elastic',
+        'transitionOut' : 'elastic',
+        'easingIn'      : 'easeOutBack',
+        'easingOut'     : 'easeInBack',
+        'type'          : 'image'
+        });
+    });
+</script>

apps/documents/urls.py

@@ -12,4 +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/$', 'document_edit', (), 'document_edit'),
+    
+    url(r'^staging_file/(?P<staging_file_id>\w+)/preview/$', 'staging_file_preview', (), 'staging_file_preview'),
+
+
 )

apps/documents/views.py

@@ -10,6 +10,11 @@ from django.views.generic.list_detail import object_detail, object_list
 from django.core.urlresolvers import reverse
 from django.views.generic.create_update import create_object, delete_object, update_object
 from django.forms.formsets import formset_factory
+from django.core.files.base import File
+
+from filetransfers.api import serve_file
+
+from convert import convert
 
 from models import Document, DocumentMetadata, DocumentType, MetadataType
 from forms import DocumentTypeSelectForm, DocumentCreateWizard, \
@@ -21,7 +26,7 @@ from staging import StagingFile
 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
 
 def document_list(request):
     return object_list(
@@ -158,10 +163,13 @@ def upload_document_with_type(request, document_type_id, multiple=True):
             context.update({
                 'subtemplates_dict':[
                     {
-                    'name':'generic_list_subtemplate.html',
-                    'title':_(u'files in staging'),
-                    'object_list':filelist,
-                    'hide_link':True,
+                        'name':'fancybox.html',
+                    },
+                    {
+                        'name':'generic_list_subtemplate.html',
+                        'title':_(u'files in staging'),
+                        'object_list':filelist,
+                        'hide_link':True,
                     },
                 ],
             })
@@ -264,3 +272,13 @@ def document_edit(request, document_id):
         'object':document,
     
     }, context_instance=RequestContext(request))
+
+
+def staging_file_preview(request, staging_file_id):
+    try:
+        filepath = StagingFile.get(staging_file_id).filepath
+        output_file = convert(filepath, STAGING_FILES_PREVIEW_SIZE)
+        return serve_file(request, File(file=open(output_file, 'r')))
+    except Exception, e:
+        #messages.error(request, e)
+        return HttpResponse('')