Changing configuration structure to enable multiple accounts.

This change enables using multiple wire plugins at the same time.
Also, we now distinguish between the wire plugin (i.e. EBICS or
taler_bank) and the wire method (i.e. SEPA or x-taler-bank) that
the wire plugin is implementing.  The "taler-bank" wire method
was renamed from "test" to "x-taler-bank".

This also changes the format of the /wire response of the exchange,
as we now need to return multiple accounts.  Note that wire fees
are specified per wire method, not per wire account.

taler-exchange-keyup now automatically signs all of the /wire
responses in the location specified by the configuration.

Account identification in wire plugins was changed to use
payto://-URLs instead of method-specific JSON fields.  Signing
and validation of /wire responses was moved from each wire
plugin to a generic validation method in libtalerutil (crypto)
or libtalerjson (for JSON-formatted inputs).
Convenience methods were added to generate JSON for wire accounts
(salting, signing).

Various section and option names were adjusted to streamline the
configuration and make it more consistent overall.  Documentation
was updated as well.

1 files changed, 133 insertions, 0 deletions

diff --git a/src/bank-lib/bank_api_parse.c b/src/bank-lib/bank_api_parse.c
new file mode 100644
index 000000000..04cf7b85f
--- /dev/null
+++ b/src/bank-lib/bank_api_parse.c
@@ -0,0 +1,133 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2018 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see
+  <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file bank-lib/bank_api_parse.c
+ * @brief Convenience function to parse authentication configuration
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_bank_service.h"
+
+
+/**
+ * Parse configuration section with bank authentication data.
+ *
+ * @param cfg configuration to parse
+ * @param section the section with the configuration data
+ * @param auth[out] set to the configuration data found
+ * @return #GNUNET_OK on success
+ */
+int
+TALER_BANK_auth_parse_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                           const char *section,
+                           struct TALER_BANK_AuthenticationData *auth)
+{
+  const struct {
+    const char *m;
+    enum TALER_BANK_AuthenticationMethod e;
+  } methods[] = {
+    { "NONE",  TALER_BANK_AUTH_NONE  },
+    { "BASIC", TALER_BANK_AUTH_BASIC },
+    { NULL, TALER_BANK_AUTH_NONE     }
+  };
+  char *method;
+
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_string (cfg,
+                                             section,
+                                             "TALER_BANK_AUTH_METHOD",
+                                             &method))
+  {
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                               section,
+                               "TALER_BANK_AUTH_METHOD");
+    return GNUNET_SYSERR;
+  }
+  for (unsigned int i=0; NULL != methods[i].m;i++)
+  {
+    if (0 == strcasecmp (method,
+                         methods[i].m))
+    {
+      switch (methods[i].e)
+      {
+      case TALER_BANK_AUTH_NONE:
+        auth->method = TALER_BANK_AUTH_NONE;
+        return GNUNET_OK;
+      case TALER_BANK_AUTH_BASIC:
+        if (GNUNET_OK !=
+            GNUNET_CONFIGURATION_get_value_string (cfg,
+                                                   section,
+                                                   "USERNAME",
+                                                   &auth->details.basic.username))
+        {
+          GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                                     section,
+                                     "USERNAME");
+          return GNUNET_SYSERR;
+        }
+        if (GNUNET_OK !=
+            GNUNET_CONFIGURATION_get_value_string (cfg,
+                                                   section,
+                                                   "PASSWORD",
+                                                   &auth->details.basic.password))
+        {
+          GNUNET_free (auth->details.basic.username);
+          auth->details.basic.username = NULL;
+          GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                                     section,
+                                     "USERNAME");
+          return GNUNET_SYSERR;
+        }
+        auth->method = TALER_BANK_AUTH_BASIC;
+        return GNUNET_OK;
+      }
+    }
+  }
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Free memory inside of @a auth (but not auth itself).
+ * Dual to #TALER_BANK_auth_parse_cfg().
+ *
+ * @param auth authentication data to free
+ */
+void
+TALER_BANK_auth_free (struct TALER_BANK_AuthenticationData *auth)
+{
+  switch (auth->method)
+  {
+  case TALER_BANK_AUTH_NONE:
+    break;
+  case TALER_BANK_AUTH_BASIC:
+    if (NULL != auth->details.basic.username)
+    {
+      GNUNET_free (auth->details.basic.username);
+      auth->details.basic.username = NULL;
+    }
+    if (NULL != auth->details.basic.password)
+    {
+      GNUNET_free (auth->details.basic.password);
+      auth->details.basic.password = NULL;
+    }
+    break;
+  }
+}
+
+
+/* end of bank_api_parse.c */