Community Bot 1 1 1 silver badge. I was just looking for something easiers so here the solution for people who look for something even simpler: A pretty easy and dirty solution would be the usage of javascript. The Overflow Blog. Podcast An oral history of Stack Overflow — told by its founding team.
Millinery on the Stack: Join us for Winter Summer? Bash, ! Featured on Meta. New responsive Activity page. Linked 5. See more linked questions. After copying the above code, run the code by typing the command python app. If everything works fine and the server starts without any problem, we have created our file downloader.
If you click the download button present in the URL, then the file will start downloading. For the above code to work properly, we need a file with the name sample.
In this tutorial, we learned to create a file uploader and file downloader using the Flask library. In addition, we have seen how to configure the max size and extension of the file upload. You may also want to see our step-by-step guide on creating a Flask app in python. How to upload a file with a python script? How to make it so you can acess it not only on the local network?
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In the above source code, the root path or endpoint will simply render the UI. This UI contains only one link for downloading a file from the server. Clicking on the link will ask user to save the file in a chosen location. The file type could be anything. As you see I have tested with four types of files. I hope this example will work with other file types as well. Now create a download. Notice in the above template file I am using Flask EL Expression language to evaluate the link endpoint.
Now navigate to the project root directory from command line tool and execute the command python main. As we haven't set a variable rule, Flask will default to string and not allow any slashes. If you try a filename that doesn't exist, you'll get a Not Found error in your browser. You'll notice these 2 routes are very similar to the first, with the addition of the filename variable.
Both router are identical apart from the addition of their corresponding file extensions in the filename variable, where we've just used an f string to append the extension to the filename. We've hard coded the extension this way as we're only allowing that type of file extension from their given route. You could of course omit it and ask the user to provide the file extension too. You may want a nested directory structure within your trusted base directory, where users can provide a path to a file in the URL to retrieve a file.
Let's say reports is our trusted base directory, containing several sub-directories and files, like so:. Without using a database, we can create a dynamic system of URL's and allow users to provide a path to a file. Let's create a new route and put this into practice, allowing our user to download a report by providing a path in the URL.
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