From 58983d7455dd0529be0b7e6ba599845956c75ea4 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 11 Dec 2022 13:48:44 +0100
Subject: add asset_type to /keys response

---
 src/exchange/exchange.conf               |  8 ++++++++
 src/exchange/taler-exchange-httpd_keys.c | 18 ++++++++++++++++++
 src/include/taler_exchange_service.h     |  8 ++++++++
 src/lib/exchange_api_handle.c            |  7 +++++++
 4 files changed, 41 insertions(+)

(limited to 'src')

diff --git a/src/exchange/exchange.conf b/src/exchange/exchange.conf
index 30e5b0b90..d662cdd0e 100644
--- a/src/exchange/exchange.conf
+++ b/src/exchange/exchange.conf
@@ -47,6 +47,14 @@ BASE_URL = http://localhost:8081/
 # How long should the aggregator sleep if it has nothing to do?
 AGGREGATOR_IDLE_SLEEP_INTERVAL = 60 s
 
+# What type of asset is the exchange managing? Used to adjust
+# the user-interface of the wallet.
+# Possibilities include: "fiat", "regional" and "crypto".
+# In the future (and already permitted but not yet supported by wallets)
+# we also expect to have "stock" and "future" (and more).
+# Default is "fiat".
+ASSET_TYPE = "fiat"
+
 # FIXME: document!
 ROUTER_IDLE_SLEEP_INTERVAL = 60 s
 
diff --git a/src/exchange/taler-exchange-httpd_keys.c b/src/exchange/taler-exchange-httpd_keys.c
index b37c68d95..b11832e72 100644
--- a/src/exchange/taler-exchange-httpd_keys.c
+++ b/src/exchange/taler-exchange-httpd_keys.c
@@ -456,6 +456,11 @@ static struct GNUNET_SCHEDULER_Task *keys_tt;
  */
 static struct GNUNET_TIME_Relative signkey_legal_duration;
 
+/**
+ * What type of asset are we dealing with here?
+ */
+static char *asset_type;
+
 /**
  * RSA security module public key, all zero if not known.
  */
@@ -1279,6 +1284,17 @@ TEH_keys_init ()
                                "SIGNKEY_LEGAL_DURATION");
     return GNUNET_SYSERR;
   }
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_string (TEH_cfg,
+                                             "exchange",
+                                             "ASSET_TYPE",
+                                             &asset_type))
+  {
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_WARNING,
+                               "exchange",
+                               "ASSET_TYPE");
+    asset_type = GNUNET_strdup ("fiat");
+  }
   keys_eh = TEH_plugin->event_listen (TEH_plugin->cls,
                                       GNUNET_TIME_UNIT_FOREVER_REL,
                                       &es,
@@ -1856,6 +1872,8 @@ create_krd (struct TEH_KeyStateHandle *ksh,
                              TEH_base_url),
     GNUNET_JSON_pack_string ("currency",
                              TEH_currency),
+    GNUNET_JSON_pack_string ("asset_type",
+                             asset_type),
     GNUNET_JSON_pack_data_auto ("master_public_key",
                                 &TEH_master_public_key),
     GNUNET_JSON_pack_time_rel ("reserve_closing_delay",
diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h
index fcb75a1b9..7ad1c2a2d 100644
--- a/src/include/taler_exchange_service.h
+++ b/src/include/taler_exchange_service.h
@@ -358,6 +358,14 @@ struct TALER_EXCHANGE_Keys
    */
   unsigned int denom_keys_size;
 
+  /**
+   * Asset type used by the exchange. Typical values
+   * are "fiat" or "crypto" or "regional" or "stock".
+   * Wallets should adjust their UI/UX based on this
+   * value.
+   */
+  char *asset_type;
+
 };
 
 
diff --git a/src/lib/exchange_api_handle.c b/src/lib/exchange_api_handle.c
index 14ba73174..3a23508c2 100644
--- a/src/lib/exchange_api_handle.c
+++ b/src/lib/exchange_api_handle.c
@@ -732,6 +732,7 @@ decode_keys_json (const json_t *resp_obj,
   struct GNUNET_HashCode hash_xor = {0};
   struct TALER_ExchangePublicKeyP pub;
   const char *currency;
+  const char *asset_type;
   json_t *wblwk = NULL;
   struct GNUNET_JSON_Specification mspec[] = {
     GNUNET_JSON_spec_fixed_auto ("denominations_sig",
@@ -746,6 +747,8 @@ decode_keys_json (const json_t *resp_obj,
                                     &key_data->reserve_closing_delay),
     GNUNET_JSON_spec_string ("currency",
                              &currency),
+    GNUNET_JSON_spec_string ("asset_type",
+                             &asset_type),
     GNUNET_JSON_spec_mark_optional (
       GNUNET_JSON_spec_json ("wallet_balance_limit_without_kyc",
                              &wblwk),
@@ -815,6 +818,7 @@ decode_keys_json (const json_t *resp_obj,
                              (check_sig) ? mspec : &mspec[2],
                              NULL, NULL));
   key_data->currency = GNUNET_strdup (currency);
+  key_data->asset_type = GNUNET_strdup (asset_type);
 
   /* parse the global fees */
   {
@@ -1233,6 +1237,7 @@ free_key_data (struct TALER_EXCHANGE_Keys *key_data)
   GNUNET_free (key_data->wallet_balance_limit_without_kyc);
   GNUNET_free (key_data->version);
   GNUNET_free (key_data->currency);
+  GNUNET_free (key_data->asset_type);
   GNUNET_free (key_data->global_fees);
 }
 
@@ -1917,6 +1922,8 @@ TALER_EXCHANGE_serialize_data (struct TALER_EXCHANGE_Handle *exchange)
                              kd->version),
     GNUNET_JSON_pack_string ("currency",
                              kd->currency),
+    GNUNET_JSON_pack_string ("asset_type",
+                             kd->asset_type),
     GNUNET_JSON_pack_data_auto ("master_public_key",
                                 &kd->master_pub),
     GNUNET_JSON_pack_time_rel ("reserve_closing_delay",
-- 
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