From 4235dbfde0f2d26bf8c78c596bc6b3ab8c093796 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Mon, 25 Jan 2016 11:31:06 +0100
Subject: adding (incomplete) plugin for SEPA

---
 src/wire/Makefile.am        |  10 +
 src/wire/plugin_wire_sepa.c | 537 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 547 insertions(+)
 create mode 100644 src/wire/plugin_wire_sepa.c

(limited to 'src/wire')

diff --git a/src/wire/Makefile.am b/src/wire/Makefile.am
index 64f50d97f..a8bc4af69 100644
--- a/src/wire/Makefile.am
+++ b/src/wire/Makefile.am
@@ -9,6 +9,7 @@ endif
 plugindir = $(libdir)/taler
 
 plugin_LTLIBRARIES = \
+  libtaler_plugin_wire_sepa.la \
   libtaler_plugin_wire_test.la
 
 noinst_LTLIBRARIES = \
@@ -26,6 +27,15 @@ libtaler_plugin_wire_test_la_LDFLAGS = \
   -lgnunetutil $(XLIB)
 
 
+libtaler_plugin_wire_sepa_la_SOURCES = \
+  plugin_wire_sepa.c
+libtaler_plugin_wire_sepa_la_LIBADD = \
+  $(LTLIBINTL)
+libtaler_plugin_wire_sepa_la_LDFLAGS = \
+  $(TALER_PLUGIN_LDFLAGS) \
+  $(top_builddir)/src/util/libtalerutil.la \
+  -lgnunetutil $(XLIB)
+
 
 libtaler_plugin_wire_template_la_SOURCES = \
   plugin_wire_template.c
diff --git a/src/wire/plugin_wire_sepa.c b/src/wire/plugin_wire_sepa.c
new file mode 100644
index 000000000..1867c0483
--- /dev/null
+++ b/src/wire/plugin_wire_sepa.c
@@ -0,0 +1,537 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2016 GNUnet e.V.
+
+  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, If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file plugin_wire_sepa.c
+ * @brief wire plugin for transfers using SEPA/EBICS
+ * @author Florian Dold
+ * @author Christian Grothoff
+ * @author Sree Harsha Totakura
+ */
+#include "platform.h"
+#include "taler_wire_plugin.h"
+
+
+/**
+ * Type of the "cls" argument given to each of the functions in
+ * our API.
+ */
+struct SepaClosure
+{
+
+  /**
+   * Which currency do we support?
+   */
+  char *currency;
+
+};
+
+
+/**
+ * Round amount DOWN to the amount that can be transferred via the wire
+ * method.  For example, Taler may support 0.000001 EUR as a unit of
+ * payment, but SEPA only supports 0.01 EUR.  This function would
+ * round 0.125 EUR to 0.12 EUR in this case.
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param[in,out] amount amount to round down
+ * @return #GNUNET_OK on success, #GNUNET_NO if rounding was unnecessary,
+ *         #GNUNET_SYSERR if the amount or currency was invalid
+ */
+static int
+sepa_amount_round (void *cls,
+                   struct TALER_Amount *amount)
+{
+  struct SepaClosure *sc = cls;
+  uint32_t delta;
+
+  if (0 != strcasecmp (amount->currency,
+                       sc->currency))
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  delta = amount->fraction % (TALER_AMOUNT_FRAC_BASE / 100);
+  if (0 == delta)
+    return GNUNET_NO;
+  amount->fraction -= delta;
+  return GNUNET_SYSERR;
+}
+
+
+/* Taken from GNU gettext */
+
+/**
+ * Entry in the country table.
+ */
+struct table_entry
+{
+  /**
+   * 2-Character international country code.
+   */
+  const char *code;
+
+  /**
+   * Long English name of the country.
+   */
+  const char *english;
+};
+
+
+/* Keep the following table in sync with gettext.
+   WARNING: the entries should stay sorted according to the code */
+/**
+ * List of country codes.
+ */
+static const struct table_entry country_table[] =
+  {
+    { "AE", "U.A.E." },
+    { "AF", "Afghanistan" },
+    { "AL", "Albania" },
+    { "AM", "Armenia" },
+    { "AN", "Netherlands Antilles" },
+    { "AR", "Argentina" },
+    { "AT", "Austria" },
+    { "AU", "Australia" },
+    { "AZ", "Azerbaijan" },
+    { "BA", "Bosnia and Herzegovina" },
+    { "BD", "Bangladesh" },
+    { "BE", "Belgium" },
+    { "BG", "Bulgaria" },
+    { "BH", "Bahrain" },
+    { "BN", "Brunei Darussalam" },
+    { "BO", "Bolivia" },
+    { "BR", "Brazil" },
+    { "BT", "Bhutan" },
+    { "BY", "Belarus" },
+    { "BZ", "Belize" },
+    { "CA", "Canada" },
+    { "CG", "Congo" },
+    { "CH", "Switzerland" },
+    { "CI", "Cote d'Ivoire" },
+    { "CL", "Chile" },
+    { "CM", "Cameroon" },
+    { "CN", "People's Republic of China" },
+    { "CO", "Colombia" },
+    { "CR", "Costa Rica" },
+    { "CS", "Serbia and Montenegro" },
+    { "CZ", "Czech Republic" },
+    { "DE", "Germany" },
+    { "DK", "Denmark" },
+    { "DO", "Dominican Republic" },
+    { "DZ", "Algeria" },
+    { "EC", "Ecuador" },
+    { "EE", "Estonia" },
+    { "EG", "Egypt" },
+    { "ER", "Eritrea" },
+    { "ES", "Spain" },
+    { "ET", "Ethiopia" },
+    { "FI", "Finland" },
+    { "FO", "Faroe Islands" },
+    { "FR", "France" },
+    { "GB", "United Kingdom" },
+    { "GD", "Caribbean" },
+    { "GE", "Georgia" },
+    { "GL", "Greenland" },
+    { "GR", "Greece" },
+    { "GT", "Guatemala" },
+    { "HK", "Hong Kong" },
+    { "HK", "Hong Kong S.A.R." },
+    { "HN", "Honduras" },
+    { "HR", "Croatia" },
+    { "HT", "Haiti" },
+    { "HU", "Hungary" },
+    { "ID", "Indonesia" },
+    { "IE", "Ireland" },
+    { "IL", "Israel" },
+    { "IN", "India" },
+    { "IQ", "Iraq" },
+    { "IR", "Iran" },
+    { "IS", "Iceland" },
+    { "IT", "Italy" },
+    { "JM", "Jamaica" },
+    { "JO", "Jordan" },
+    { "JP", "Japan" },
+    { "KE", "Kenya" },
+    { "KG", "Kyrgyzstan" },
+    { "KH", "Cambodia" },
+    { "KR", "South Korea" },
+    { "KW", "Kuwait" },
+    { "KZ", "Kazakhstan" },
+    { "LA", "Laos" },
+    { "LB", "Lebanon" },
+    { "LI", "Liechtenstein" },
+    { "LK", "Sri Lanka" },
+    { "LT", "Lithuania" },
+    { "LU", "Luxembourg" },
+    { "LV", "Latvia" },
+    { "LY", "Libya" },
+    { "MA", "Morocco" },
+    { "MC", "Principality of Monaco" },
+    { "MD", "Moldava" },
+    { "MD", "Moldova" },
+    { "ME", "Montenegro" },
+    { "MK", "Former Yugoslav Republic of Macedonia" },
+    { "ML", "Mali" },
+    { "MM", "Myanmar" },
+    { "MN", "Mongolia" },
+    { "MO", "Macau S.A.R." },
+    { "MT", "Malta" },
+    { "MV", "Maldives" },
+    { "MX", "Mexico" },
+    { "MY", "Malaysia" },
+    { "NG", "Nigeria" },
+    { "NI", "Nicaragua" },
+    { "NL", "Netherlands" },
+    { "NO", "Norway" },
+    { "NP", "Nepal" },
+    { "NZ", "New Zealand" },
+    { "OM", "Oman" },
+    { "PA", "Panama" },
+    { "PE", "Peru" },
+    { "PH", "Philippines" },
+    { "PK", "Islamic Republic of Pakistan" },
+    { "PL", "Poland" },
+    { "PR", "Puerto Rico" },
+    { "PT", "Portugal" },
+    { "PY", "Paraguay" },
+    { "QA", "Qatar" },
+    { "RE", "Reunion" },
+    { "RO", "Romania" },
+    { "RS", "Serbia" },
+    { "RU", "Russia" },
+    { "RW", "Rwanda" },
+    { "SA", "Saudi Arabia" },
+    { "SE", "Sweden" },
+    { "SG", "Singapore" },
+    { "SI", "Slovenia" },
+    { "SK", "Slovak" },
+    { "SN", "Senegal" },
+    { "SO", "Somalia" },
+    { "SR", "Suriname" },
+    { "SV", "El Salvador" },
+    { "SY", "Syria" },
+    { "TH", "Thailand" },
+    { "TJ", "Tajikistan" },
+    { "TM", "Turkmenistan" },
+    { "TN", "Tunisia" },
+    { "TR", "Turkey" },
+    { "TT", "Trinidad and Tobago" },
+    { "TW", "Taiwan" },
+    { "TZ", "Tanzania" },
+    { "UA", "Ukraine" },
+    { "US", "United States" },
+    { "UY", "Uruguay" },
+    { "VA", "Vatican" },
+    { "VE", "Venezuela" },
+    { "VN", "Viet Nam" },
+    { "YE", "Yemen" },
+    { "ZA", "South Africa" },
+    { "ZW", "Zimbabwe" }
+  };
+
+
+/**
+ * Country code comparator function, for binary search with bsearch().
+ *
+ * @param ptr1 pointer to a `struct table_entry`
+ * @param ptr2 pointer to a `struct table_entry`
+ * @return result of strncmp()'ing the 2-digit country codes of the entries
+ */
+static int
+cmp_country_code (const void *ptr1,
+                  const void *ptr2)
+{
+  const struct table_entry *cc1 = ptr1;
+  const struct table_entry *cc2 = ptr2;
+
+  return strncmp (cc1->code,
+                  cc2->code,
+                  2);
+}
+
+
+/**
+ * Validates given IBAN according to the European Banking Standards.  See:
+ * http://www.europeanpaymentscouncil.eu/documents/ECBS%20IBAN%20standard%20EBS204_V3.2.pdf
+ *
+ * @param iban the IBAN number to validate
+ * @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
+ */
+static int
+validate_iban (const char *iban)
+{
+  char cc[2];
+  char ibancpy[35];
+  struct table_entry cc_entry;
+  unsigned int len;
+  char *nbuf;
+  unsigned int i;
+  unsigned int j;
+  unsigned long long dividend;
+  unsigned long long remainder;
+  int nread;
+  int ret;
+
+  len = strlen (iban);
+  if (len > 34)
+    return GNUNET_NO;
+  strncpy (cc, iban, 2);
+  strncpy (ibancpy, iban + 4, len - 4);
+  strncpy (ibancpy + len - 4, iban, 4);
+  ibancpy[len] = '\0';
+  cc_entry.code = cc;
+  cc_entry.english = NULL;
+  if (NULL ==
+      bsearch (&cc_entry,
+               country_table,
+               sizeof (country_table) / sizeof (struct table_entry),
+               sizeof (struct table_entry),
+               &cmp_country_code))
+    return GNUNET_NO;
+  nbuf = GNUNET_malloc ((len * 2) + 1);
+  for (i=0, j=0; i < len; i++)
+  {
+    if (isalpha ((int) ibancpy[i]))
+    {
+      if (2 != snprintf(&nbuf[j],
+                        3,
+                        "%2u",
+                        (ibancpy[i] - 'A' + 10)))
+      {
+        GNUNET_free (nbuf);
+        return GNUNET_NO;
+      }
+      j += 2;
+      continue;
+    }
+    nbuf[j] = ibancpy[i];
+    j++;
+  }
+  for (j=0;'\0' != nbuf[j];j++)
+    GNUNET_assert (isdigit(nbuf[j]));
+  GNUNET_assert (sizeof(dividend) >= 8);
+  remainder = 0;
+  for (i=0; i<j; i+=16)
+  {
+    if (1 !=
+        (ret = sscanf (&nbuf[i],
+                       "%16llu %n",
+                       &dividend,
+                       &nread)))
+    {
+      GNUNET_free (nbuf);
+      return GNUNET_NO;
+    }
+    if (0 != remainder)
+      dividend += remainder * (pow (10, nread));
+    remainder = dividend % 97;
+  }
+  GNUNET_free (nbuf);
+  if (1 == remainder)
+    return GNUNET_YES;
+  return GNUNET_NO;
+}
+
+
+/**
+ * Check if the given wire format JSON object is correctly formatted
+ *
+ * @param wire the JSON wire format object
+ * @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
+ */
+static int
+sepa_wire_validate (const json_t *wire)
+{
+  json_error_t error;
+  const char *type;
+  const char *iban;
+  const char *name;
+  const char *bic;
+  uint64_t r;
+  const char *address;
+
+  if (0 != json_unpack_ex
+      ((json_t *) wire,
+       &error, JSON_STRICT,
+       "{"
+       "s:s," /* TYPE: sepa */
+       "s:s," /* IBAN: iban */
+       "s:s," /* name: beneficiary name */
+       "s:s," /* BIC: beneficiary bank's BIC */
+       "s:i," /* r: random 64-bit integer nounce */
+       "s:s"  /* address: address of the beneficiary */
+       "}",
+       "type", &type,
+       "IBAN", &iban,
+       "name", &name,
+       "bic", &bic,
+       "r", &r,
+       "address", &address))
+  {
+    TALER_json_warn (error);
+    return GNUNET_SYSERR;
+  }
+  if (1 != validate_iban (iban))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+		"IBAN `%s' invalid\n",
+		iban);
+    return GNUNET_NO;
+  }
+  return GNUNET_YES;
+}
+
+
+/**
+ * Prepare for exeuction of a wire transfer.
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param wire valid wire account information
+ * @param amount amount to transfer, already rounded
+ * @param wtid wire transfer identifier to use
+ * @param psc function to call with the prepared data to persist
+ * @param psc_cls closure for @a psc
+ * @return NULL on failure
+ */
+static struct TALER_WIRE_PrepareHandle *
+sepa_prepare_wire_transfer (void *cls,
+                            const json_t *wire,
+                            const struct TALER_Amount *amount,
+                            const struct TALER_WireTransferIdentifierRawP *wtid,
+                            TALER_WIRE_PrepareTransactionCallback psc,
+                            void *psc_cls)
+{
+  GNUNET_break (0); // FIXME: not implemented
+  return NULL;
+}
+
+
+/**
+ * Abort preparation of a wire transfer. For example,
+ * because we are shutting down.
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param pth preparation to cancel
+ */
+static void
+sepa_prepare_wire_transfer_cancel (void *cls,
+                                   struct TALER_WIRE_PrepareHandle *pth)
+{
+  GNUNET_break (0); // FIXME: not implemented
+}
+
+
+/**
+ * Execute a wire transfer.
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param buf buffer with the prepared execution details
+ * @param buf_size number of bytes in @a buf
+ * @param cc function to call upon success
+ * @param cc_cls closure for @a cc
+ * @return NULL on error
+ */
+static struct TALER_WIRE_ExecuteHandle *
+sepa_execute_wire_transfer (void *cls,
+                            const char *buf,
+                            size_t buf_size,
+                            TALER_WIRE_ConfirmationCallback cc,
+                            void *cc_cls)
+{
+  GNUNET_break (0); // FIXME: not implemented
+  return NULL;
+}
+
+
+/**
+ * Abort execution of a wire transfer. For example, because we are
+ * shutting down.  Note that if an execution is aborted, it may or
+ * may not still succeed. The caller MUST run @e
+ * execute_wire_transfer again for the same request as soon as
+ * possilbe, to ensure that the request either ultimately succeeds
+ * or ultimately fails. Until this has been done, the transaction is
+ * in limbo (i.e. may or may not have been committed).
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param eh execution to cancel
+ */
+static void
+sepa_execute_wire_transfer_cancel (void *cls,
+                                   struct TALER_WIRE_ExecuteHandle *eh)
+{
+  GNUNET_break (0); // FIXME: not implemented
+}
+
+
+/**
+ * Initialize sepa-wire subsystem.
+ *
+ * @param cls a configuration instance
+ * @return NULL on error, otherwise a `struct TALER_WIRE_Plugin`
+ */
+void *
+libtaler_plugin_wire_sepa_init (void *cls)
+{
+  struct GNUNET_CONFIGURATION_Handle *cfg = cls;
+  struct SepaClosure *sc;
+  struct TALER_WIRE_Plugin *plugin;
+
+  sc = GNUNET_new (struct SepaClosure);
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_string (cfg,
+                                             "mint",
+                                             "CURRENCY",
+                                             &sc->currency))
+  {
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                               "mint",
+                               "CURRENCY");
+    GNUNET_free (sc);
+    return NULL;
+  }
+
+  plugin = GNUNET_new (struct TALER_WIRE_Plugin);
+  plugin->cls = sc;
+  plugin->amount_round = &sepa_amount_round;
+  plugin->wire_validate = &sepa_wire_validate;
+  plugin->prepare_wire_transfer = &sepa_prepare_wire_transfer;
+  plugin->prepare_wire_transfer_cancel = &sepa_prepare_wire_transfer_cancel;
+  plugin->execute_wire_transfer = &sepa_execute_wire_transfer;
+  plugin->execute_wire_transfer_cancel = &sepa_execute_wire_transfer_cancel;
+  return plugin;
+}
+
+
+/**
+ * Shutdown Sepa wire subsystem.
+ *
+ * @param cls a `struct TALER_WIRE_Plugin`
+ * @return NULL (always)
+ */
+void *
+libtaler_plugin_wire_sepa_done (void *cls)
+{
+  struct TALER_WIRE_Plugin *plugin = cls;
+  struct SepaClosure *sc = plugin->cls;
+
+  GNUNET_free (sc->currency);
+  GNUNET_free (sc);
+  GNUNET_free (plugin);
+  return NULL;
+}
+
+/* end of plugin_wire_sepa.c */
-- 
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