There is no way to pass custom region when authenticating to s3 compatible REST service using v4 auth scheme when a service url does not contain s3 or region explicitly.

[pstrzelczak]

I wanted to check v4 authentication in a s3 compatible service using boto but I failed because boto seems to infer region from url and does not allow to use e.g. fixed region.

The code I used is the almost same as in https://github.com/boto/boto/issues/2623. The only difference is that a host is simply localhost.

What I got is: Traceback (most recent call last): File "v4Defect.py", line 27, in connection.create_bucket("bucketname") File "/home2/strzelczak/local/python2.6libs/boto/s3/connection.py", line 612, in create_bucket data=data) File "/home2/strzelczak/local/python2.6libs/boto/s3/connection.py", line 664, in make_request retry_handler=retry_handler File "/home2/strzelczak/local/python2.6libs/boto/connection.py", line 1053, in make_request retry_handler=retry_handler) File "/home2/strzelczak/local/python2.6libs/boto/connection.py", line 911, in _mexe request.authorize(connection=self) File "/home2/strzelczak/local/python2.6libs/boto/connection.py", line 375, in authorize connection._auth_handler.add_auth(self, _kwargs) File "/home2/strzelczak/local/python2.6libs/boto/auth.py", line 675, in add_auth return super(S3HmacAuthV4Handler, self).add_auth(req, _kwargs) File "/home2/strzelczak/local/python2.6libs/boto/auth.py", line 513, in add_auth string_to_sign = self.string_to_sign(req, canonical_request) File "/home2/strzelczak/local/python2.6libs/boto/auth.py", line 468, in string_to_sign sts.append(self.credential_scope(http_request)) File "/home2/strzelczak/local/python2.6libs/boto/auth.py", line 450, in credential_scope region_name = self.determine_region_name(http_request.host) File "/home2/strzelczak/local/python2.6libs/boto/auth.py", line 618, in determine_region_name return region_name UnboundLocalError: local variable 'region_name' referenced before assignment

I tried to fix a region by using boto.config.set('Boto', 'autoscale_region_name', 'us-west-2') but it did not help.

[jyoungs]

+1

Note- the HmacAuthV4Handler has this comment:

# You can set the service_name and region_name to override the # values which would otherwise come from the endpoint, e.g. # ..amazonaws.com.

Seems like this is almost there.

(FWIW also- the JavaSDK supports this)

[robbat2]

There IS a way to do it:

conn = S3Connection(...)
conn.auth_region_name = 'myregion'
bucket = conn.get_bucket('mybucket')