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authorChristian Grothoff <christian@grothoff.org>2020-08-19 18:19:00 +0200
committerChristian Grothoff <christian@grothoff.org>2020-08-19 18:19:00 +0200
commit46dde9368f75013b2383c24d4c8a11763ac8e31e (patch)
tree7971e4bdd18a951521e4317b1619ecbabbc15a8c /src/json
parenta84c61dd82b17bc42593e5fd358cd0917d195f4f (diff)
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implement i18n lookup logic for #6458
Diffstat (limited to 'src/json')
-rw-r--r--src/json/Makefile.am1
-rw-r--r--src/json/i18n.c95
2 files changed, 96 insertions, 0 deletions
diff --git a/src/json/Makefile.am b/src/json/Makefile.am
index 2910d077..d7c569d6 100644
--- a/src/json/Makefile.am
+++ b/src/json/Makefile.am
@@ -10,6 +10,7 @@ lib_LTLIBRARIES = \
libtalerjson.la
libtalerjson_la_SOURCES = \
+ i18n.c \
json.c \
json_helper.c \
json_wire.c
diff --git a/src/json/i18n.c b/src/json/i18n.c
new file mode 100644
index 00000000..b92d63ed
--- /dev/null
+++ b/src/json/i18n.c
@@ -0,0 +1,95 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2020 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 json/i18n.c
+ * @brief helper functions for i18n in JSON processing
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include "taler_util.h"
+#include "taler_json_lib.h"
+
+
+/**
+ * Extract a string from @a object under the field @a field, but respecting
+ * the Taler i18n rules and the language preferences expressed in @a
+ * language_pattern.
+ *
+ * Basically, the @a object may optionally contain a sub-object
+ * "${field}_i18n" with a map from IETF BCP 47 language tags to a localized
+ * version of the string. If this map exists and contains an entry that
+ * matches the @a language pattern, that object (usually a string) is
+ * returned. If the @a language_pattern does not match any entry, or if the
+ * i18n sub-object does not exist, we simply return @a field of @a object
+ * (also usually a string).
+ *
+ * If @a object does not have a member @a field we return NULL (error).
+ *
+ * @param object the object to extract internationalized
+ * content from
+ * @param language_pattern a language preferences string
+ * like "fr-CH, fr;q=0.9, en;q=0.8, *;q=0.1", following
+ * https://tools.ietf.org/html/rfc7231#section-5.3.1
+ * @param field name of the field to extract
+ * @return NULL on error, otherwise the member from
+ * @a object. Note that the reference counter is
+ * NOT incremented.
+ */
+const json_t *
+TALER_JSON_extract_i18n (const json_t *object,
+ const char *language_pattern,
+ const char *field)
+{
+ const json_t *ret;
+ json_t *i18n;
+ double quality = -1;
+
+ ret = json_object_get (object,
+ field);
+ if (NULL == ret)
+ return NULL; /* field MUST exist in object */
+ {
+ char *name;
+
+ GNUNET_asprintf (&name,
+ "%s_i18n",
+ field);
+ i18n = json_object_get (object,
+ name);
+ GNUNET_free (name);
+ }
+ if (NULL == i18n)
+ return ret;
+ {
+ const char *key;
+ json_t *value;
+
+ json_object_foreach (i18n, key, value) {
+ double q = TALER_language_matches (language_pattern,
+ key);
+ if (q > quality)
+ {
+ quality = q;
+ ret = value;
+ }
+ }
+ }
+ return ret;
+}
+
+
+/* end of i18n.c */