Add function for getting creds of remote client (#2089)

This is needed while checking PutObject/DeleteObject permissions
on bucket replicated remote targets to create admin client and
invoke API.

Signed-off-by: Shubhendu Ram Tripathi <[email protected]>

Author: shtripat

api.go

@@ -1065,3 +1065,11 @@ func (c *Client) CredContext() *credentials.CredContext {
 		Endpoint: c.endpointURL.String(),
 	}
 }
+
+// GetCreds returns the access creds for the client
+func (c *Client) GetCreds() (credentials.Value, error) {
+	if c.credsProvider == nil {
+		return credentials.Value{}, errors.New("no credentials provider")
+	}
+	return c.credsProvider.GetWithContext(c.CredContext())
+}