Django download files

Viewed 3k times. Improve this question. Marcus Grass Marcus Grass 1 1 gold badge 15 15 silver badges 34 34 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Bob Bob 4, 29 29 silver badges 50 50 bronze badges. Thanks, is there a way not to specify content type? The files could be in different types than just jpg. MarcusGrass, I updated the answer, added the automatical inference of the content type.

It is optional, but if you don't Django will just shove in the default encoding from your project's settings often text content type , so it's better to specify it if possible, although nothing will break most of the time, because most of modern browsers can handle such things Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Who owns this outage? Building intelligent escalation chains for modern SRE. Podcast Who is building clouds for the independent developer? There are a few other methods and attributes available on UploadedFile objects; see UploadedFile for a complete reference. If you are constructing an object manually, you can assign the file object from request. FILES to the file field in the model:.

Then override the post method of your FormView subclass to handle multiple file uploads:. When a user uploads a file, Django passes off the file data to an upload handler — a small class that handles file data as it gets uploaded. You can write custom handlers that customize how Django handles files.

You could, for example, use custom handlers to enforce user-level quotas, compress data on the fly, render progress bars, and even send data to another storage location directly without storing it locally. See Writing custom upload handlers for details on how you can customize or completely replace upload behavior. By default, if an uploaded file is smaller than 2. This means that saving the file involves only a read from memory and a write to disk and thus is very fast.

If an upload is large enough, you can watch this file grow in size as Django streams the data onto disk. These specifics — 2. See File Upload Settings for details. Note that it's important that you send a redirect after an upload. Otherwise, some file hosting services won't work correctly. By default, uploads are assumed to have a publicly accessible URL if that's supported by the backend. If the backend has no control over the permissions e.

Asynchronous backends like async S3 or even Blobstore have to take special care of preventing faked uploads. After a successful upload to the actual server these backends have to generate a separate request which contains the POST data and a file ID identifying the uploaded file the Blobstore automatically sends the blob key and async S3 would send the file and bucket name. The problem here is that a user can manually generate a request which matches the ID of some other user's private file, thus getting access to that file because it's now fake-uploaded to his private files, too.

In order to prevent this asynchronous backends have to guarantee that no file ID is used twice for an upload. Since the actual download permissions can be out of the backend's control the download solution consists of two layers.

This means that you should also use that function as a fallback even if you only have public downloads. The function takes two required arguments: the request and the Django File object that should be served e. Otherwise it returns None. Otherwise the public download URL is used. You can specify the backends in your settings. The default upload backend simply returns the URL unmodified.