[taler-anastasis] 03/04: work on initial policy

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dennis-neufeld pushed a commit to branch master
in repository anastasis.

commit 1c29911aafac52fec2a019a579ab1f6351901e8d
Author: Dennis Neufeld <dennis.neufeld@students.bfh.ch>
AuthorDate: Mon Sep 28 15:19:28 2020 +0200

    work on initial policy
---
 src/include/anastasis_redux.h        |  1 +
 src/lib/anastasis_api_backup_redux.c | 62 ++++++++++++++++++++++++++++++++++--
 2 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/src/include/anastasis_redux.h b/src/include/anastasis_redux.h
index 8d2cfe9..4adc474 100644
--- a/src/include/anastasis_redux.h
+++ b/src/include/anastasis_redux.h
@@ -27,6 +27,7 @@
 #include <gnunet/gnunet_util_lib.h>
 #include "anastasis_error_codes.h"
 
+
 /**
  * JSON containing all supported countries and additional data.
  */
diff --git a/src/lib/anastasis_api_backup_redux.c 
b/src/lib/anastasis_api_backup_redux.c
index 1a32f70..e4a8b0f 100644
--- a/src/lib/anastasis_api_backup_redux.c
+++ b/src/lib/anastasis_api_backup_redux.c
@@ -162,13 +162,69 @@ add_authentication (const json_t *state,
                    "backup-state",
                    json_string ("ReduxAuthenticationAddedState"));
 
-  json_object_set_new (new_state,
-                       "authentication_methods",
-                       methods);
+  json_object_set (new_state,
+                   "authentication_methods",
+                   methods);
+
+  {
+    // initialize policy
+    size_t index_m; // index methods array
+    size_t index_up; // index used_providers array
+    json_t *method;
+    json_t *used_providers = json_array ();
+    json_t *policy = json_array ();
+
+    // simply distribute the methods
+    json_array_foreach (methods, index_m, method)
+    {
+      size_t index_p; // index providers array
+      json_t *provider;
+      json_t *used_provider;
+      json_t *policy_element = json_object ();
+      json_t *provider_arr = json_object_get (method, "providers");
+      json_array_foreach (provider_arr, index_p, provider)
+      {
+        json_t *method_cpy = json_deep_copy (method);
+        json_object_del (method_cpy, "providers");
+        json_object_set_new (policy_element, "method", method_cpy);
+
+        bool used = false;
+        json_array_foreach (used_providers, index_up, used_provider)
+        {
+          // first, check if provider already is used for a method
+          if (json_equal (provider, used_provider))
+          {
+            used = true;
+            break;
+          }
+        }
+        if (! used)
+        {
+          // if provider is not used for a method, choose it
+          json_array_append (used_providers, provider);
+          json_object_set_new (policy_element, "provider", provider);
+          break;
+        }
+        // if all providers are used once, begin with the first again
+        if (json_array_size (provider_arr) == index_p - 1)
+        {
+          json_array_clear (used_providers);
+          provider = json_array_get (provider_arr, 0);
+          json_array_append (used_providers, provider);
+          json_object_set_new (policy_element, "provider", provider);
+        }
+      }
+      json_array_append_new (policy, policy_element);
+    }
+    json_object_set_new (new_state,
+                         "initial_policy",
+                         policy);
+  }
 
   cb (cb_cls,
       ANASTASIS_EC_NONE,
       new_state);
+  json_decref (methods);
   json_decref (new_state);
 }
 

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