Allow AL internal UniqueID to be used as attribute

[jkakavas]

If configured, map AL internal unique id as an attribute to be used
by satosa, microservices and other plugins.

[bajnokk]

One line was missing from the commit of @jkakavas. As this is just a trivial oversight, I prefer not to open a merge request to his tree but paste the solution here. Feel free to apply it or wait for him to update this pull request.

index ad4202e..b437129 100644
--- a/src/satosa/micro_services/account_linking.py
+++ b/src/satosa/micro_services/account_linking.py
@@ -32,6 +32,7 @@ class AccountLinking(ResponseMicroService):
         self.redirect_url = config["redirect_url"]
         self.signing_key = RSAKey(key=rsa_load(config["sign_key"]), use="sig", alg="RS256")
         self.endpoint = "/handle_account_linking"
+        self.config = config
         logger.info("Account linking is active")

     def _handle_al_response(self, context):```

[c00kiemon5ter]

config is static and set at initialisation time through __init__. I propose we move this to __init__ too, as id_to_attr is not going to change and calling .get over and over is only wasting cpu cycles.

@@ -32,6 +32,7 @@ def __init__(self, config, *args, **kwargs):
          self.redirect_url = config["redirect_url"]
          self.signing_key = RSAKey(key=rsa_load(config["sign_key"]), use="sig", alg="RS256")
          self.endpoint = "/handle_account_linking"
+         self.config = config
+         self.id_to_attr = self.config.get("id_to_attr", None)
          logger.info("Account linking is active")
  
      def _handle_al_response(self, context):

then all you need to do is

if self.id_to_attr:
    internal_response.attributes[self.id_to_attr] = [message]

[jkakavas]

I'm only using self.config = config in order to get id_to_attr later on, so we even could do something like

self.id_to_attr = config.get("id_to_attr", None)

[c00kiemon5ter]

Which brings me to the next point, which is that attributes are stored as an array of attribute-values. I think this should be

internal_response.attributes[id_to_attr] = [message]
#                                          ^ notice the brackets

[jkakavas]

good catch, thanks

[c00kiemon5ter]

LGTM