Django storages amazon S3 giving 400 bad request exception

Question

This is the first time I was tying to use AWS S3 for media storages. The application is hosted in Heroku, for static files it has not been a problem so I do not want to change static files, but want the applications users to upload files and images which I wish to store in S3. I have already spent 2-3 days so far now and no proper solution was found as I get 400 exception without a proper reason. Here is the documentation which I referred to: http://tech.marksblogg.com/file-uploads-amazon-s3-django.html So, my settings now:

DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'

AWS_S3_ACCESS_KEY_ID='dummyid'
AWS_S3_SECRET_ACCESS_KEY='dummykey'
AWS_STORAGE_BUCKET_NAME='dummyname'
AWS_QUERYSTRING_AUTH = False
AWS_HEADERS = {'Cache-Control': 'max-age=86400', }
MEDIAFILES_LOCATION = 'media'
MEDIA_URL = 'http://%s.s3.amazonaws.com/media/' % AWS_STORAGE_BUCKET_NAME

My model:

class DummyDocuments(models.Model): document = models.FileField(upload_to='documents')

My form:

class DummyUploadForm(forms.Form): documents = forms.FileField(widget=forms.ClearableFileInput(attrs={'multiple': True}))

And here is the view, where I am using it:

def upload(request):
    if request.method == 'POST':
        form = DummyUploadForm(request.POST, request.FILES)
        if form.is_valid():
            files = request.FILES.getlist('documents')
            for file in files:
                instance = DummyDocuments(document=file)
                instance.save()
            return redirect('activation_upload')
    else:
        form = DummyUploadForm()

    documents = DummyDocuments.objects.all()

    return render(request, 'activation/dummyupload.html', {'form': form, 'documents': documents})

Here is my CORS config on AWS:

<?xml version="1.0" encoding="UTF-8"?> <CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <CORSRule> <AllowedOrigin>*</AllowedOrigin> <AllowedMethod>GET</AllowedMethod> <AllowedMethod>POST</AllowedMethod> <AllowedMethod>PUT</AllowedMethod> <AllowedHeader>*</AllowedHeader> </CORSRule> </CORSConfiguration>

Here is the exception which I am getting:

May I know what exactly is wrong?

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SOLUTION

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All this django storage libs are quiet undocumented. I went through a lot of different articles to figure this out. You need this setting:

AWS_S3_HOST = 's3.ca-central-1.amazonaws.com'

and, ~/.boto config with the contents:

[Credentials]
aws_access_key_id=yourid
aws_secret_access_key=yourkey

[s3]

host=s3.ca-central-1.amazonaws.com

Answer 1

I believe this is caused (assuming that all of the credentials and other setup are correct, but it's throwing a 400 error rather than a 403) by this issue.

As a result, the two options seem to be:

1. Switch regions (as mentioned in comments, I had this problem yesterday with a new install of boto, and switched from London -> Dublin, which rectified it with no further changes)

2. Add a file ~/.boto and put in the following, per Martin's comment on that thread.:

   [s3]

   host=s3.eu-central-1.amazonaws.com

Substituting for your appropriate region. You can create the file either by touch ~/.boto and editing it from there, or by simply doing nano ~/.boto and saving it.

Answer 2

Actually, what worked for me was creating a new bucket in a different region. It seems like the boto package has issues connecting to s3 buckets in specific regions. My settings.py file

DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
AWS_ACCESS_KEY_ID = 'your-access-key'
AWS_SECRET_ACCESS_KEY = 'your-secret-access-key'
AWS_STORAGE_BUCKET_NAME = 'mybucketname'

No boto file needed when the host region was s3-website-us-west-2.amazonaws.com