apps/fileupload/views.py

   1 # -*- coding: utf-8 -*-
   2 import json
   3 import os
   4 from zipfile import ZipFile
   5 from urllib import quote
   6 from django.conf import settings
   7 from django.http import HttpResponse, Http404
   8 from django.utils.decorators import method_decorator
   9 from django.utils.encoding import force_unicode
  10 from django.views.decorators.vary import vary_on_headers
  11 from django.views.generic import FormView, RedirectView
  12 from .forms import UploadForm
  13
  14
  15 # Use sorl.thumbnail if available.
  16 try:
  17     from sorl.thumbnail import default
  18 except ImportError:
  19     def thumbnail(relpath):
  20         return settings.MEDIA_URL + relpath
  21     default = None
  22 else:
  23     def thumbnail(relpath):
  24         try:
  25             return default.backend.get_thumbnail(relpath, "x50").url
  26         except IOError:
  27             # That's not an image. No thumb.
  28             return None
  29
  30
  31 class JSONResponse(HttpResponse):
  32     """JSON response class."""
  33     def __init__(self, obj=None, mimetype="application/json", *args, **kwargs):
  34         content = json.dumps(obj)
  35         super(JSONResponse, self).__init__(content, mimetype, *args, **kwargs)
  36
  37
  38 class UploadViewMixin(object):
  39     def get_safe_path(self, filename=""):
  40         """Finds absolute filesystem path of the browsed dir of file.
  41
  42         Makes sure it's inside MEDIA_ROOT.
  43
  44         """
  45         path = os.path.abspath(os.path.join(settings.MEDIA_ROOT, self.get_directory(), filename))
  46         if not path.startswith(os.path.abspath(settings.MEDIA_ROOT)):
  47             raise Http404
  48         if filename:
  49             if not path.startswith(self.get_safe_path()):
  50                 raise Http404
  51         return force_unicode(path)
  52
  53
  54 class UploadView(UploadViewMixin, FormView):
  55     template_name = "fileupload/picture_form.html"
  56     form_class = UploadForm
  57
  58     def get_object(self, request, *args, **kwargs):
  59         """Get any data for later use."""
  60         return None
  61
  62     def get_directory(self):
  63         """Directory relative to MEDIA_ROOT. Must end with a slash."""
  64         return self.kwargs['path']
  65
  66     def breadcrumbs(self):
  67         """List of tuples (name, url) or just (name,) for breadcrumbs.
  68
  69         Probably only the last item (representing currently browsed dir)
  70         should lack url.
  71
  72         """
  73         directory = self.get_directory()
  74         now_path = os.path.dirname(self.request.get_full_path())
  75         directory = os.path.dirname(directory)
  76         if directory:
  77             crumbs = [
  78                 (os.path.basename(directory),)
  79             ]
  80             directory = os.path.dirname(directory)
  81             now_path = (os.path.dirname(now_path))
  82             while directory:
  83                 crumbs.insert(0, (os.path.basename(directory), now_path+'/'))
  84                 directory = os.path.dirname(directory)
  85                 now_path = os.path.dirname(now_path)
  86             crumbs.insert(0, ('media', now_path))
  87         else:
  88             crumbs = [('media',)]
  89         return crumbs
  90
  91     def get_url(self, filename):
  92         """Finds URL of a file in browsed dir."""
  93         return settings.MEDIA_URL + self.get_directory() + quote(filename.encode('utf-8'))
  94
  95     @method_decorator(vary_on_headers('Accept'))
  96     def dispatch(self, request, *args, **kwargs):
  97         self.object = self.get_object(request, *args, **kwargs)
  98         return super(UploadView, self).dispatch(request, *args, **kwargs)
  99
 100     def get(self, request, *args, **kwargs):
 101         if request.is_ajax():
 102             files = []
 103             path = self.get_safe_path()
 104             if os.path.isdir(path):
 105                 for f in sorted(os.listdir(path)):
 106                     file_info = {
 107                         "name": f,
 108                     }
 109                     if os.path.isdir(os.path.join(path, f)):
 110                         file_info.update({
 111                             "url": "%s%s/" % (request.get_full_path(), f),
 112                         })
 113                     else:
 114                         thumbnail_url = thumbnail(self.get_directory() + f)
 115                         file_info.update({
 116                             "url": self.get_url(f),
 117                             'thumbnail_url': thumbnail_url,
 118                             'delete_url': "%s?file=%s" % (
 119                                 request.get_full_path(),
 120                                 quote(f.encode('utf-8'))),
 121                             'delete_type': "DELETE"
 122                         })
 123                     files.append(file_info)
 124             return JSONResponse(files)
 125         else:
 126             return super(UploadView, self).get(request, *args, **kwargs)
 127
 128     def form_valid(self, form):
 129         flist = self.request.FILES.getlist('files')
 130         path = self.get_safe_path()
 131         if not os.path.isdir(path):
 132             os.makedirs(path)
 133         data = []
 134         for f in flist:
 135             with open(self.get_safe_path(f.name), 'w') as destination:
 136                 for chunk in f.chunks():
 137                     destination.write(chunk)
 138             data.append({
 139                 'name': f.name,
 140                 'url': self.get_url(f.name),
 141                 'thumbnail_url': thumbnail(self.get_directory() + f.name),
 142                 'delete_url': "%s?file=%s" % (
 143                     self.request.get_full_path(),
 144                     quote(f.name.encode('utf-8'))),
 145                 'delete_type': "DELETE",
 146             })
 147         response = JSONResponse(data)
 148         response['Content-Disposition'] = 'inline; filename=files.json'
 149         return response
 150
 151     def delete(self, request, *args, **kwargs):
 152         os.unlink(self.get_safe_path(request.GET.get('file')))
 153         response = JSONResponse(True)
 154         response['Content-Disposition'] = 'inline; filename=files.json'
 155         return response
 156
 157
 158 class PackageView(UploadViewMixin, RedirectView):
 159     # usage of RedirectView here is really really ugly
 160     permanent = False
 161
 162     def dispatch(self, request, *args, **kwargs):
 163         self.object = self.get_object(request, *args, **kwargs)
 164         path = self.get_safe_path()
 165         with ZipFile(os.path.join(path, 'package.zip'), 'w') as zip_file:
 166             for f in os.listdir(path):
 167                 if f == 'package.zip':
 168                     continue
 169                 zip_file.write(os.path.join(path, f), arcname=f)
 170         return super(PackageView, self).dispatch(request, *args, **kwargs)