how to make a file download site by web.py

[Yunfan Jiang]

i want to make a file download site by web.py
and the file content which i store in database using blob, so how can
i response the file value to user? and how to process the mime?

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[Sergei Sadovski]

I did it in such way

class Download:
def GET(self, id):
web.header('Content-Type', attachment.type) # file type
web.header('Content-disposition', 'attachment; filename='
+ attachment.file_name) # force browser to show "Save as" dialog.
return data # your blob

> and how to process the mime?

When you upload file, FieldStorage instance contains mime type in
"type" property.

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Best regards,
Sergei Sadovski

[andrei]

This is how i do it using generator. Its better because it doesn't load the whole file into memory.

class DownloadFile(app.page):

    

    path="/(users|tenders)/(\d+)/files/(\d+)"

    

    def GET(self, obj_type, obj_id, file_id):

        doc = db.select("files", locals(), where="id=$file_id and obj_type=$obj_type and obj_id=$obj_id", limit=1)[0]

        web.header("Content-Disposition", "attachment; filename=%s" % doc.filename)

        web.header("Content-Type", doc.filetype)

        web.header('Transfer-Encoding','chunked')

        f = open(os.path.join(config.upload_dir, doc.path, doc.filename), 'rb')

        while 1:

            buf = f.read(1024 * 8)

            if not buf:

                break

            yield buf

[andrei]

Sorry, I misread the post. You don't need generator if you store the whole file in database.

And to process mime i used mimetypes.guess_type.

This code i use for upload (assuming we can have many file inputs with the same name "files")

def process_upload(obj_type, obj_id):

    i = web.webapi.rawinput()

    try:

        files = i.files

        now = datetime.datetime.now()

        path = os.path.join(str(now.year), str(now.month))

        if not os.path.exists(os.path.join(config.upload_dir, path)):

            os.makedirs(os.path.join(config.upload_dir, path))

        if not isinstance(files, list):

            files = [files]

        for f in files:

            if f.filename:

                filetype, encoding = mimetypes.guess_type(f.filename)

                if not filetype:

                    flash.set(u"<p>Incorrect file format.</p>")

                    continue

                file_id = db.insert("files", title=web.safeunicode(f.filename), obj_type=obj_type, obj_id=obj_id, filetype=filetype, path=path, filename="")

                filename = ("document_%d" % file_id) + mimetypes.guess_extension(filetype)

                f2 = open(os.path.join(config.upload_dir, path, filename), 'w')

                while 1:

                    buf = f.file.read(1024 * 8)

                    if not buf:

                        break

                    f2.write(buf)

                size = f2.tell()

                f.file.close()

                f2.close()

                db.update("files", where="id=$file_id", vars=dict(file_id=file_id), filename=filename, size=size)

    except KeyError:

        pass

[Yunfan Jiang]

thank you for all your help, Sergei Sadovski and andrei, i think i
got what i need