def sign()

in botocore/signers.py [0:0]

• 39 lines of code
• 10 McCabe index (conditional complexity)

    def sign(self, operation_name, request, region_name=None,
             signing_type='standard', expires_in=None, signing_name=None):
        """Sign a request before it goes out over the wire.

        :type operation_name: string
        :param operation_name: The name of the current operation, e.g.
                               ``ListBuckets``.
        :type request: AWSRequest
        :param request: The request object to be sent over the wire.

        :type region_name: str
        :param region_name: The region to sign the request for.

        :type signing_type: str
        :param signing_type: The type of signing to perform. This can be one of
            three possible values:

            * 'standard'     - This should be used for most requests.
            * 'presign-url'  - This should be used when pre-signing a request.
            * 'presign-post' - This should be used when pre-signing an S3 post.

        :type expires_in: int
        :param expires_in: The number of seconds the presigned url is valid
            for. This parameter is only valid for signing type 'presign-url'.

        :type signing_name: str
        :param signing_name: The name to use for the service when signing.
        """
        explicit_region_name = region_name
        if region_name is None:
            region_name = self._region_name

        if signing_name is None:
            signing_name = self._signing_name

        signature_version = self._choose_signer(
            operation_name, signing_type, request.context)

        # Allow mutating request before signing
        self._event_emitter.emit(
            'before-sign.{0}.{1}'.format(
                self._service_id.hyphenize(), operation_name),
            request=request, signing_name=signing_name,
            region_name=self._region_name,
            signature_version=signature_version, request_signer=self,
            operation_name=operation_name
        )

        if signature_version != botocore.UNSIGNED:
            kwargs = {
                'signing_name': signing_name,
                'region_name': region_name,
                'signature_version': signature_version
            }
            if expires_in is not None:
                kwargs['expires'] = expires_in
            signing_context = request.context.get('signing', {})
            if not explicit_region_name and signing_context.get('region'):
                kwargs['region_name'] = signing_context['region']
            if signing_context.get('signing_name'):
                kwargs['signing_name'] = signing_context['signing_name']
            try:
                auth = self.get_auth_instance(**kwargs)
            except UnknownSignatureVersionError as e:
                if signing_type != 'standard':
                    raise UnsupportedSignatureVersionError(
                        signature_version=signature_version)
                else:
                    raise e

            auth.add_auth(request)