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[rajbala]

Save files to S3.

[Turing_Machine → rajbala]

You can do that with signed forms and similar techniques, though. No need to have the key on the client side (and lots of reasons not to).

[Turing_Machine → Turing_Machine]

The flow is roughly this:

1) Client: "Hey, I want to upload a file."

2) Server: "Okay, here's a temporary key good for the next <n> minutes. The file has to be named <blah> and can't be more than <x> MB long" (there are other restrictions you can set, too, IIRC)

3) Client posts the form to S3 including the temporary key as a field.

4) Result.