I'm in the process of 'upgrading' an old Web2py application hosted on GAE
that performs a fair amount of file manipulation. The original version
used the blobstore to create files, and the 'default/download' function was
modified to serve those blobs like this (abbreviated):
blob_key = request.args[0]
blob_info = blobstore.get(blob_key)
response.headers['X-AppEngine-BlobKey'] = blob_key;
response.headers['Content-Type'] = blob_info.content_type;
response.headers['Content-Disposition'] = "attachment; filename=%s"
% blob_info.filename
blob_reader = blob_info.open()
response.stream(blob_reader)
Blobstore is now gone so I changed the code to use a GCS bucket.
Everything works well everywhere in the application as far as uploading and
creating files internally, but when I want to offer those files for
download I can't get it to work. As you know, files on GCS buckets are
accessible via their path (i.e. cloudstore.open(file_path)) however if I
try something like:
file_reader = cloudstore.open(file_path)
response.stream(file_reader)
all I get is a blank webpage with 'None' written on it, and no file.
I can't (and don't want to) offer the actual file_path for download
straight to the user because the bucket permissions are private and web2py
is the only one authorized to access it.
I've tried a number of combinations (setting headers with content-type and
content-disposition versus no headers, response.write versus
response.stream, reading file to StringIO object and try to stream/write
that object instead) but none of them work. I'm at a point where I'm
blindly trying different code combinations. Does anybody have a working
code example for this?
Thanks,
Julian
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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