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Store an uploaded file

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Problem

You want to upload a file and store it in a predefined folder.

Solution

import web

urls = ('/upload', 'Upload')

class Upload:
    def GET(self):
        web.header("Content-Type","text/html; charset=utf-8")
        return """<html><head></head><body>
<form method="POST" enctype="multipart/form-data" action="">
<input type="file" name="myfile" />
<br/>
<input type="submit" />
</form>
</body></html>"""

    def POST(self):
        x = web.input(myfile={})
        filedir = '/path/where/you/want/to/save' # change this to the directory you want to store the file in.
        if 'myfile' in x: # to check if the file-object is created
            filepath=x.myfile.filename.replace('\\','/') # replaces the windows-style slashes with linux ones.
            filename=filepath.split('/')[-1] # splits the and chooses the last part (the filename with extension)
            fout = open(filedir +'/'+ filename,'w') # creates the file where the uploaded file should be stored
            fout.write(x.myfile.file.read()) # writes the uploaded file to the newly created file.
            fout.close() # closes the file, upload complete.
        raise web.seeother('/upload')


if __name__ == "__main__":
   app = web.application(urls, globals()) 
   app.run()

Hang ups

A couple of things to watch out for:

  • See fileupload.
  • Don't put the file in a folder that is executable without any check of the extension and type of file.
  • Actually, we need to open the fout file object in mode "wb"(in windows), ie. write binary mode, otherwise the image uploaded is broken.