使用Django从Amazon S3下载文件

Question

I am new to the Django framework , I was trying to generate a link to download files from Amazon S3 . I got this error when I tried to load the template page:

Reverse for 'myapp.views.handles3downloads' with arguments '(u'README.md',)'
and keyword arguments '{}' not found.

urls.py

urlpatterns = patterns('',
    url(r'^handles3downloads/(\d+)/$', handles3downloads),
)

views.py

def handles3downloads(request, fname):
    bucket_name = 'bucketname'
    key = s.get_bucket(bucket_name).get_key(fname)
    dfilename = key.get_contents_to_filename(fname)

    wrapper = HttpResponse(file(dfilename))
    response = HttpResponse(wrapper, content_type='text/plain')
    response['Content-Length'] = os.path.getsize(dfilename)
    return response

template file

<a href="{% url 'myapp.views.handles3downloads' sfile.linkUrl %}">{{sfile.linkUrl}}</a>

I looked at some of the solutions with similar errors but it didn't help me. Can anyone help me out please.

Advance thanks

Answer 1

Your regular expression in the urls.py file seems to be wrong. Try using this instead:

url(r'^handles3downloads/(\w+)/$', handles3downloads),

You're passing parameter string to the view, and the regex is matching integers.

Answer 2

Jordan is correct, there is a problem with your urls.py. You can tell by the error. You are trying to get a reverse on 'myapp.views.handles3downloads', but has that reverse string been identified? Try this.

urlpatterns = patterns('',
     url(r'^handles3downloads/([^/]+)/$', handles3downloads,
     name='myapp.views.handles3downloads'),
)

Answer 3

urls.py

url(r'^handles3downloads/', handles3downloads),

views.py

def handles3downloads(request):
  fname = request.GET['filename']
  bucket_name = 'bucketname'
  key = s.get_bucket(bucket_name).get_key(fname)
  key.get_contents_to_filename('/tmp/'+key.name)
  wrapper = FileWrapper(open('/tmp/'+fname, 'rb'))
  content_type = mimetypes.guess_type('/tmp/'+fname)[0]
  response = HttpResponse(wrapper,content_type=content_type)
  response['Content-Length'] = os.path.getsize('/tmp/'+fname)
  response['Content-Disposition'] = 'attachment; filename=%s' % smart_str(fname)

templates

<a href="/handles3downloads/?filename=file1.jpg" rel="external">Download</a>