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authorChristian Grothoff <christian@grothoff.org>2016-03-19 15:23:11 +0100
committerChristian Grothoff <christian@grothoff.org>2016-03-19 15:23:11 +0100
commit0d1eced630f4ed05ad95fdbb4354fd428c9cdbf6 (patch)
tree0ed4d6f189ed72287a0e003446c87a2b6db70c1a /src/json
parentd229f78da3b0b7f851d3541f59651b4f600c879d (diff)
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first refactoring of JSON logic to address #4150 and #4237
Diffstat (limited to 'src/json')
-rw-r--r--src/json/Makefile.am38
-rw-r--r--src/json/json.c53
-rw-r--r--src/json/json_helper.c146
-rw-r--r--src/json/test_json.c71
4 files changed, 308 insertions, 0 deletions
diff --git a/src/json/Makefile.am b/src/json/Makefile.am
new file mode 100644
index 00000000..6f71b871
--- /dev/null
+++ b/src/json/Makefile.am
@@ -0,0 +1,38 @@
+# This Makefile.am is in the public domain
+AM_CPPFLAGS = -I$(top_srcdir)/src/include
+
+if USE_COVERAGE
+ AM_CFLAGS = --coverage -O0
+ XLIB = -lgcov
+endif
+
+lib_LTLIBRARIES = \
+ libtalerjson.la
+
+libtalerjson_la_SOURCES = \
+ json.c \
+ json_helper.c
+libtalerjson_la_LDFLAGS = \
+ -version-info 0:0:0 \
+ -export-dynamic -no-undefined
+libtalerjson_la_LIBADD = \
+ -lgnunetjson \
+ $(top_builddir)/src/util/libtalerutil.la \
+ -lgnunetutil \
+ -ljansson \
+ $(XLIB)
+
+TESTS = \
+ test_json
+
+check_PROGRAMS= \
+ test_json
+
+test_json_SOURCES = \
+ test_json.c
+test_json_LDADD = \
+ -ltalerjson \
+ -lgnunetjson \
+ $(top_builddir)/src/util/libtalerutil.la \
+ -lgnunetutil \
+ -ljansson
diff --git a/src/json/json.c b/src/json/json.c
new file mode 100644
index 00000000..1fbc59a7
--- /dev/null
+++ b/src/json/json.c
@@ -0,0 +1,53 @@
+/*
+ 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.c
+ * @brief helper functions for JSON processing using libjansson
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include "taler_util.h"
+#include "taler_json_lib.h"
+
+
+/**
+ * Hash a JSON for binary signing.
+ *
+ * @param[in] json some JSON value
+ * @param[out] hc resulting hash code
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+TALER_JSON_hash (json_t *json,
+ struct GNUNET_HashCode *hc)
+{
+ char *wire_enc;
+ size_t len;
+
+ if (NULL == (wire_enc = json_dumps (json,
+ JSON_COMPACT | JSON_SORT_KEYS)))
+ return GNUNET_SYSERR;
+ len = strlen (wire_enc) + 1;
+ GNUNET_CRYPTO_hash (wire_enc,
+ len,
+ hc);
+ free (wire_enc);
+ return GNUNET_OK;
+}
+
+
+/* End of json/json.c */
diff --git a/src/json/json_helper.c b/src/json/json_helper.c
new file mode 100644
index 00000000..b61fe21a
--- /dev/null
+++ b/src/json/json_helper.c
@@ -0,0 +1,146 @@
+/*
+ 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 */
diff --git a/src/json/test_json.c b/src/json/test_json.c
new file mode 100644
index 00000000..9f42dbd3
--- /dev/null
+++ b/src/json/test_json.c
@@ -0,0 +1,71 @@
+/*
+ This file is part of TALER
+ (C) 2015, 2016 GNUnet e.V. and Inria
+
+ 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/test_json.c
+ * @brief Tests for Taler-specific crypto logic
+ * @author Christian Grothoff <christian@grothoff.org>
+ */
+#include "platform.h"
+#include "taler_util.h"
+#include "taler_json_lib.h"
+
+
+/**
+ * Test amount conversion from/to JSON.
+ *
+ * @return 0 on success
+ */
+static int
+test_amount ()
+{
+ json_t *j;
+ struct TALER_Amount a1;
+ struct TALER_Amount a2;
+ struct GNUNET_JSON_Specification spec[] = {
+ TALER_JSON_spec_amount (NULL, &a2),
+ GNUNET_JSON_spec_end()
+ };
+
+ GNUNET_assert (GNUNET_OK ==
+ TALER_string_to_amount ("EUR:4.3",
+ &a1));
+ j = TALER_JSON_from_amount (&a1);
+ GNUNET_assert (NULL != j);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_JSON_parse (j, spec,
+ NULL, NULL));
+ GNUNET_assert (0 ==
+ TALER_amount_cmp (&a1,
+ &a2));
+ json_decref (j);
+ return 0;
+}
+
+
+int
+main(int argc,
+ const char *const argv[])
+{
+ GNUNET_log_setup ("test-json",
+ "WARNING",
+ NULL);
+ if (0 != test_amount ())
+ return 1;
+ return 0;
+}
+
+/* end of test_json.c */