How to upload an image with python-tornado from an HTML form?
I saw examples that used pycurl, but could not be sure if this is the way to go with? Some examples will help. Thanks.
Answer
Here is demo application that implements tornado upload.
Here is server code:
import tornado.httpserver, tornado.ioloop, tornado.options, tornado.web, os.path, random, string
from tornado.options import define, options
define("port", default=8888, help="run on the given port", type=int)
class Application(tornado.web.Application):
def __init__(self):
handlers = [
(r"/", IndexHandler),
(r"/upload", UploadHandler)
]
tornado.web.Application.__init__(self, handlers)
class IndexHandler(tornado.web.RequestHandler):
def get(self):
self.render("upload_form.html")
class UploadHandler(tornado.web.RequestHandler):
def post(self):
file1 = self.request.files['file1'][0]
original_fname = file1['filename']
extension = os.path.splitext(original_fname)[1]
fname = ''.join(random.choice(string.ascii_lowercase + string.digits) for x in range(6))
final_filename= fname+extension
output_file = open("uploads/" + final_filename, 'w')
output_file.write(file1['body'])
self.finish("file" + final_filename + " is uploaded")
def main():
http_server = tornado.httpserver.HTTPServer(Application())
http_server.listen(options.port)
tornado.ioloop.IOLoop.instance().start()
if __name__ == "__main__":
main()
The only thing, you have to understand from this code, that file content located in self.request.files[<file_input_name>][0].
Here is html code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Tornado Upload Application</title>
</head>
<body>
<p><h1>Tornado Upload App</h1></p>
<form enctype="multipart/form-data" action="/upload" method="post">
File: <input type="file" name="file1" />
<br />
<br />
<input type="submit" value="upload" />
</form>
When working with files - be sure, that form has enctype="multipart/form-data".