Question

I have the following template form, containing several variables.

<form action="https://me.s3.amazonaws.com/" method="post" enctype='multipart/form-data' class="upload-form">
    <input type="hidden" name="key" value="videos/{{filename}}">
    <input type="hidden" name="AWSAccessKeyId" value="{{access_key}}"> 
    <input type="hidden" name="acl" value="public-read">
    <input type="hidden" name="policy" value="{{policy}}">
    <input type="hidden" name="signature" value="{{signature}}">
    <input type="hidden" name="Content-Type" value="{{content_type}}">
    <input name="file" type="file"> 
    <input type="submit" value="Upload" name="upload">
</form>

However, as soon as the submit button is hit, the form is sent to amazon, and I’m not able to pass it variables. This is what I’ve been trying to do, unsuccessfully —

    if 'upload' in request.POST:
        policy = base64.b64encode(...)
        signature = base64.b64encode(
            hmac.new('secret_key', policy, sha).digest())
        file = request.POST['files']
        filename=file.name
        content_type=mimetypes.guess_type(filename)[0]

What do I need to do to pass the variables to the form after the POST request but BEFORE amazon processes the form? Thank you.

Answer 1

You should change your form’s action to your django view and in your view you can re-post to https://me.s3.amazonaws.com/:

In your template

<form action="http://mywebsite/upload" method="post" ...

In your view.py:

def upload(request):
    # Your treatment here.
    # Post the data to amazon S3.
    urllib2.urlopen("https://me.s3.amazonaws.com/", your_data)
    ...