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/*
* Copyright (c) 2023 Balazs Scheidler <balazs.scheidler@axoflow.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "filterx/object-json-internal.h"
#include "filterx/object-null.h"
#include "filterx/object-primitive.h"
#include "filterx/object-string.h"
#include "filterx/object-message-value.h"
#include "filterx/filterx-weakrefs.h"
#include "filterx/filterx-eval.h"
#include "scanner/list-scanner/list-scanner.h"
#include "str-repr/encode.h"
static int
_deep_copy_filterx_object_ref(json_object *src, json_object *parent, const char *key, size_t index, json_object **dst)
{
int result = json_c_shallow_copy_default(src, parent, key, index, dst);
if (*dst != NULL)
{
/* we need to copy the userdata for primitive types */
switch (json_object_get_type(src))
{
case json_type_null:
case json_type_boolean:
case json_type_double:
case json_type_int:
case json_type_string:
{
FilterXObject *fobj = json_object_get_userdata(src);
if (fobj)
filterx_json_associate_cached_object(*dst, fobj);
break;
}
default:
break;
}
return 2;
}
return result;
}
struct json_object *
filterx_json_deep_copy(struct json_object *jso)
{
struct json_object *clone = NULL;
if (json_object_deep_copy(jso, &clone, _deep_copy_filterx_object_ref) != 0)
return NULL;
return clone;
}
static FilterXObject *
_convert_json_to_object(FilterXObject *self, FilterXWeakRef *root_container, struct json_object *jso)
{
switch (json_object_get_type(jso))
{
case json_type_double:
return filterx_double_new(json_object_get_double(jso));
case json_type_boolean:
return filterx_boolean_new(json_object_get_boolean(jso));
case json_type_int:
return filterx_integer_new(json_object_get_int64(jso));
case json_type_string:
return filterx_string_new(json_object_get_string(jso), -1);
case json_type_array:
return filterx_json_array_new_sub(json_object_get(jso),
filterx_weakref_get(root_container) ? : filterx_object_ref(self));
case json_type_object:
return filterx_json_object_new_sub(json_object_get(jso),
filterx_weakref_get(root_container) ? : filterx_object_ref(self));
default:
g_assert_not_reached();
}
}
FilterXObject *
filterx_json_convert_json_to_object_cached(FilterXObject *self, FilterXWeakRef *root_container,
struct json_object *jso)
{
FilterXObject *filterx_obj;
if (!jso || json_object_get_type(jso) == json_type_null)
return filterx_null_new();
if (json_object_get_type(jso) == json_type_double)
{
/* this is a workaround to ditch builtin serializer for double objects
* that are set when parsing from a string representation.
* json_object_double_new_ds() will set userdata to the string
* representation of the number, as extracted from the JSON source.
*
* Changing the value of the double to the same value, ditches this,
* but only if necessary.
*/
json_object_set_double(jso, json_object_get_double(jso));
}
/* NOTE: userdata is a weak reference */
filterx_obj = json_object_get_userdata(jso);
if (filterx_obj)
return filterx_object_ref(filterx_obj);
filterx_obj = _convert_json_to_object(self, root_container, jso);
if (!filterx_object_is_frozen(self))
filterx_json_associate_cached_object(jso, filterx_obj);
return filterx_obj;
}
void
filterx_json_associate_cached_object(struct json_object *jso, FilterXObject *filterx_obj)
{
filterx_eval_store_weak_ref(filterx_obj);
/* we are not storing a reference in userdata to avoid circular
* references. That ref is retained by the filterx_scope_store_weak_ref()
* call above, which is automatically terminated when the scope ends */
json_object_set_userdata(jso, filterx_obj, NULL);
}
FilterXObject *
filterx_json_new_from_repr(const gchar *repr, gssize repr_len)
{
if (repr_len == 0 || repr[0] == '{')
return filterx_json_object_new_from_repr(repr, repr_len);
return filterx_json_array_new_from_repr(repr, repr_len);
}
FilterXObject *
filterx_json_new_from_args(GPtrArray *args)
{
if (!args || args->len == 0)
return filterx_json_object_new_empty();
if (args->len != 1)
{
msg_error("FilterX: Failed to create JSON object: invalid number of arguments. "
"Usage: json() or json($raw_json_string) or json($existing_json)");
return NULL;
}
FilterXObject *arg = (FilterXObject *) g_ptr_array_index(args, 0);
if (filterx_object_is_type(arg, &FILTERX_TYPE_NAME(json_array)) ||
filterx_object_is_type(arg, &FILTERX_TYPE_NAME(json_object)))
return filterx_object_ref(arg);
if (filterx_object_is_type(arg, &FILTERX_TYPE_NAME(message_value)))
{
FilterXObject *unmarshalled = filterx_object_unmarshal(arg);
if (!filterx_object_is_type(unmarshalled, &FILTERX_TYPE_NAME(json_array)) &&
!filterx_object_is_type(unmarshalled, &FILTERX_TYPE_NAME(json_object)))
{
filterx_object_unref(unmarshalled);
goto error;
}
return unmarshalled;
}
gsize repr_len;
const gchar *repr = filterx_string_get_value(arg, &repr_len);
if (repr)
return filterx_json_new_from_repr(repr, repr_len);
error:
msg_error("FilterX: Failed to create JSON object: invalid argument type. "
"Usage: json() or json($raw_json_string) or json($syslog_ng_list) or json($existing_json)",
evt_tag_str("type", arg->type->name));
return NULL;
}
FilterXObject *
filterx_json_new_from_object(struct json_object *jso)
{
if (json_object_get_type(jso) == json_type_object)
return filterx_json_object_new_sub(jso, NULL);
if (json_object_get_type(jso) == json_type_array)
return filterx_json_array_new_sub(jso, NULL);
return NULL;
}
const gchar *
filterx_json_to_json_literal(FilterXObject *s)
{
if (filterx_object_is_type(s, &FILTERX_TYPE_NAME(json_object)))
return filterx_json_object_to_json_literal(s);
if (filterx_object_is_type(s, &FILTERX_TYPE_NAME(json_array)))
return filterx_json_array_to_json_literal(s);
return NULL;
}
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