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-rw-r--r--src/json/json_helper.c146
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diff --git a/src/json/json_helper.c b/src/json/json_helper.c
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+/*
+ This file is part of TALER
+ Copyright (C) 2014, 2015, 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 json/json_helper.c
+ * @brief helper functions to generate specifications to parse
+ * Taler-specific JSON objects with libgnunetjson
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include "taler_util.h"
+#include "taler_json_lib.h"
+
+
+/**
+ * Convert a TALER amount to a JSON object.
+ *
+ * @param amount the amount
+ * @return a json object describing the amount
+ */
+json_t *
+TALER_JSON_from_amount (const struct TALER_Amount *amount)
+{
+ json_t *j;
+
+ if ( (amount->value != (uint64_t) ((json_int_t) amount->value)) ||
+ (0 > ((json_int_t) amount->value)) )
+ {
+ /* Theoretically, json_int_t can be a 32-bit "long", or we might
+ have a 64-bit value which converted to a 63-bit signed long
+ long causes problems here. So we check. Note that depending
+ on the platform, the compiler may be able to statically tell
+ that at least the first check is always false. */
+ GNUNET_break (0);
+ return NULL;
+ }
+ j = json_pack ("{s:s, s:I, s:I}",
+ "currency", amount->currency,
+ "value", (json_int_t) amount->value,
+ "fraction", (json_int_t) amount->fraction);
+ GNUNET_assert (NULL != j);
+ return j;
+}
+
+
+/**
+ * Parse given JSON object to Amount
+ *
+ * @param cls closure, NULL
+ * @param root the json object representing data
+ * @param[out] spec where to write the data
+ * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
+ */
+static int
+parse_amount (void *cls,
+ json_t *root,
+ struct GNUNET_JSON_Specification *spec)
+{
+ struct TALER_Amount *r_amount = spec->ptr;
+ json_int_t value;
+ json_int_t fraction;
+ const char *currency;
+
+ memset (r_amount,
+ 0,
+ sizeof (struct TALER_Amount));
+ if (0 != json_unpack (root,
+ "{s:I, s:I, s:s}",
+ "value", &value,
+ "fraction", &fraction,
+ "currency", &currency))
+ {
+ char *json_enc;
+
+ if (NULL == (json_enc = json_dumps (root,
+ JSON_COMPACT | JSON_ENCODE_ANY)))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Malformed JSON amount: %s\n",
+ json_enc);
+ free (json_enc);
+ return GNUNET_SYSERR;
+ }
+ if ( (value < 0) ||
+ (fraction < 0) ||
+ (value > UINT64_MAX) ||
+ (fraction > UINT32_MAX) )
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (strlen (currency) >= TALER_CURRENCY_LEN)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ r_amount->value = (uint64_t) value;
+ r_amount->fraction = (uint32_t) fraction;
+ strcpy (r_amount->currency, currency);
+ (void) TALER_amount_normalize (r_amount);
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * Provide specification to parse given JSON object to an amount.
+ *
+ * @param name name of the amount field in the JSON
+ * @param[out] r_amount where the amount has to be written
+ */
+struct GNUNET_JSON_Specification
+TALER_JSON_spec_amount (const char *name,
+ struct TALER_Amount *r_amount)
+{
+ struct GNUNET_JSON_Specification ret = {
+ .parser = &parse_amount,
+ .cleaner = NULL,
+ .cls = NULL,
+ .field = name,
+ .ptr = r_amount,
+ .ptr_size = 0,
+ .size_ptr = NULL
+ };
+ return ret;
+}
+
+
+/* end of json/json_helper.c */