Export get_csrf_token to the api (refs #112)

Author: vimalloc

docs/api.rst

@@ -46,6 +46,7 @@ Utilities
 
 .. autofunction:: decode_token
 .. autofunction:: get_current_user
+.. autofunction:: get_csrf_token
 .. autofunction:: get_jti
 .. autofunction:: get_jwt_claims
 .. autofunction:: get_jwt_identity

flask_jwt_extended/__init__.py

@@ -6,5 +6,5 @@
     create_refresh_token, create_access_token, get_jwt_identity,
     get_jwt_claims, set_access_cookies, set_refresh_cookies,
     unset_jwt_cookies, get_raw_jwt, get_current_user, current_user,
-    get_jti, decode_token
+    get_jti, decode_token, get_csrf_token
 )

flask_jwt_extended/utils.py

@@ -159,6 +159,12 @@ def verify_token_claims(*args, **kwargs):
 
 
 def get_csrf_token(encoded_token):
+    """
+    Returns the CSRF double submit token from an encoded JWT.
+
+    :param encoded_token: The encoded JWT
+    :return: The CSRF double submit token
+    """
     token = decode_token(encoded_token)
     return token['csrf']