Create get_rsa_key function to obtain the key from filesystem.

oidc_provider/lib/utils/common.py

@@ -1,3 +1,4 @@
+from django.conf import settings as django_settings
 from django.core.urlresolvers import reverse
 
 from oidc_provider import settings
@@ -14,3 +15,14 @@ def get_issuer():
     issuer = site_url + path
 
     return issuer
+
+
+def get_rsa_key():
+    """
+    Load the rsa key previously created with `creatersakey` command.
+    """
+    file_path = django_settings.BASE_DIR + '/OIDC_RSA_KEY.pem'
+    with open(file_path, 'r') as f:
+        key = f.read()
+
+    return key