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gerrit.cesnet.cz / github / CESNET / libyang / f2b0a04ca10b01f81ac6fa66e3114b5e3680ac8a / . / src / parser_json.c
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/**
* @file parser_json.c
* @author Radek Krejci <rkrejci@cesnet.cz>
* @author Michal Vasko <mvasko@cesnet.cz>
* @brief JSON data parser for libyang
*
* Copyright (c) 2020 - 2022 CESNET, z.s.p.o.
*
* This source code is licensed under BSD 3-Clause License (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*/
#define _GNU_SOURCE
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "compat.h"
#include "context.h"
#include "dict.h"
#include "in_internal.h"
#include "json.h"
#include "log.h"
#include "parser_data.h"
#include "parser_internal.h"
#include "plugins_exts.h"
#include "set.h"
#include "tree.h"
#include "tree_data.h"
#include "tree_data_internal.h"
#include "tree_schema.h"
#include "tree_schema_internal.h"
#include "validation.h"
/**
* @brief Free the JSON data parser context.
*
* JSON implementation of lyd_ctx_free_clb().
*/
static void
lyd_json_ctx_free(struct lyd_ctx *lydctx)
{
struct lyd_json_ctx *ctx = (struct lyd_json_ctx *)lydctx;
if (lydctx) {
lyd_ctx_free(lydctx);
lyjson_ctx_free(ctx->jsonctx);
free(ctx);
}
}
/**
* @brief Pass the responsibility for releasing the dynamic values to @p dst.
*
* @param[in] jsonctx JSON context which contains the dynamic value.
* @param[in,out] dst Pointer to which the responsibility will be submited.
* If the pointer is already pointing to some allocated memory, it is released beforehand.
*/
static void
lyjson_ctx_give_dynamic_value(struct lyjson_ctx *jsonctx, char **dst)
{
assert(jsonctx && dst);
if (!jsonctx->dynamic) {
return;
}
if (dst) {
free(*dst);
}
*dst = NULL;
/* give the dynamic value */
*dst = (char *)jsonctx->value;
/* responsibility for the release is now passed to dst */
jsonctx->dynamic = 0;
}
/**
* @brief Parse JSON member-name as [\@][prefix:][name]
*
* \@ - metadata flag, maps to 1 in @p is_meta_p
* prefix - name of the module of the data node
* name - name of the data node
*
* All the output parameter are mandatory. Function only parse the member-name, all the appropriate checks are up to the caller.
*
* @param[in] value String to parse
* @param[in] value_len Length of the @p str.
* @param[out] name_p Pointer to the beginning of the parsed name.
* @param[out] name_len_p Pointer to the length of the parsed name.
* @param[out] prefix_p Pointer to the beginning of the parsed prefix. If the member-name does not contain prefix, result is NULL.
* @param[out] prefix_len_p Pointer to the length of the parsed prefix. If the member-name does not contain prefix, result is 0.
* @param[out] is_meta_p Pointer to the metadata flag, set to 1 if the member-name contains \@, 0 otherwise.
*/
static void
lydjson_parse_name(const char *value, size_t value_len, const char **name_p, size_t *name_len_p, const char **prefix_p,
size_t *prefix_len_p, ly_bool *is_meta_p)
{
const char *name, *prefix = NULL;
size_t name_len, prefix_len = 0;
ly_bool is_meta = 0;
name = memchr(value, ':', value_len);
if (name != NULL) {
prefix = value;
if (*prefix == '@') {
is_meta = 1;
prefix++;
}
prefix_len = name - prefix;
name++;
name_len = value_len - (prefix_len + 1) - is_meta;
} else {
name = value;
if (name[0] == '@') {
is_meta = 1;
name++;
}
name_len = value_len - is_meta;
}
*name_p = name;
*name_len_p = name_len;
*prefix_p = prefix;
*prefix_len_p = prefix_len;
*is_meta_p = is_meta;
}
/**
* @brief Get correct prefix (module_name) inside the @p node.
*
* @param[in] node Data node to get inherited prefix.
* @param[in] local_prefix Local prefix to replace the inherited prefix.
* @param[in] local_prefix_len Length of the @p local_prefix string. In case of 0, the inherited prefix is taken.
* @param[out] prefix_p Pointer to the resulting prefix string, Note that the result can be NULL in case of no local prefix
* and no context @p node to get inherited prefix.
* @param[out] prefix_len_p Pointer to the length of the resulting @p prefix_p string. Note that the result can be 0 in case
* of no local prefix and no context @p node to get inherited prefix.
* @return LY_ERR value.
*/
static LY_ERR
lydjson_get_node_prefix(struct lyd_node *node, const char *local_prefix, size_t local_prefix_len, const char **prefix_p,
size_t *prefix_len_p)
{
struct lyd_node_opaq *onode;
const char *module_name = NULL;
assert(prefix_p && prefix_len_p);
if (local_prefix_len) {
*prefix_p = local_prefix;
*prefix_len_p = local_prefix_len;
return LY_SUCCESS;
}
*prefix_p = NULL;
while (node) {
if (node->schema) {
*prefix_p = node->schema->module->name;
break;
}
onode = (struct lyd_node_opaq *)node;
if (onode->name.module_name) {
*prefix_p = onode->name.module_name;
break;
} else if (onode->name.prefix) {
*prefix_p = onode->name.prefix;
break;
}
node = lyd_parent(node);
}
*prefix_len_p = ly_strlen(module_name);
return LY_SUCCESS;
}
/**
* @brief Skip the current JSON object/array.
*
* @param[in] jsonctx JSON context with the input data to skip.
* @return LY_ERR value.
*/
static LY_ERR
lydjson_data_skip(struct lyjson_ctx *jsonctx)
{
enum LYJSON_PARSER_STATUS status, current;
uint32_t orig_depth;
status = lyjson_ctx_status(jsonctx, 0);
assert((status == LYJSON_OBJECT) || (status == LYJSON_ARRAY));
orig_depth = jsonctx->depth;
/* next */
LY_CHECK_RET(lyjson_ctx_next(jsonctx, &current));
if ((status == LYJSON_OBJECT) && (current != LYJSON_OBJECT) && (current != LYJSON_ARRAY)) {
/* no nested objects */
LY_CHECK_RET(lyjson_ctx_next(jsonctx, NULL));
return LY_SUCCESS;
}
/* skip after the content */
while ((jsonctx->depth > orig_depth) || (current != status + 1)) {
if (current == LYJSON_ARRAY) {
/* skip the array separately */
LY_CHECK_RET(lydjson_data_skip(jsonctx));
current = lyjson_ctx_status(jsonctx, 0);
} else {
LY_CHECK_RET(lyjson_ctx_next(jsonctx, &current));
}
if (current == LYJSON_END) {
break;
}
}
return LY_SUCCESS;
}
/**
* @brief Get schema node corresponding to the input parameters.
*
* @param[in] lydctx JSON data parser context.
* @param[in] is_attr Flag if the reference to the node is an attribute, for logging only.
* @param[in] prefix Requested node's prefix (module name).
* @param[in] prefix_len Length of the @p prefix.
* @param[in] name Requested node's name.
* @param[in] name_len Length of the @p name.
* @param[in] parent Parent of the node being processed, can be NULL in case of top-level.
* @param[out] snode Found schema node corresponding to the input parameters. If NULL, parse as an opaque node.
* @param[out] ext Extension instance that provided @p snode, if any.
* @return LY_SUCCES on success.
* @return LY_ENOT if the whole object was parsed (skipped or as an extension).
* @return LY_ERR on error.
*/
static LY_ERR
lydjson_get_snode(struct lyd_json_ctx *lydctx, ly_bool is_attr, const char *prefix, size_t prefix_len, const char *name,
size_t name_len, struct lyd_node *parent, const struct lysc_node **snode, struct lysc_ext_instance **ext)
{
LY_ERR ret = LY_SUCCESS, r;
struct lys_module *mod = NULL;
uint32_t getnext_opts = lydctx->int_opts & LYD_INTOPT_REPLY ? LYS_GETNEXT_OUTPUT : 0;
*snode = NULL;
*ext = NULL;
/* get the element module, prefer parent context because of extensions */
if (prefix_len) {
mod = ly_ctx_get_module_implemented2(parent ? LYD_CTX(parent) : lydctx->jsonctx->ctx, prefix, prefix_len);
} else if (parent) {
if (parent->schema) {
mod = parent->schema->module;
}
} else if (!(lydctx->int_opts & LYD_INTOPT_ANY)) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX_JSON, "Top-level JSON object member \"%.*s\" must be namespace-qualified.",
(int)(is_attr ? name_len + 1 : name_len), is_attr ? name - 1 : name);
ret = LY_EVALID;
goto cleanup;
}
if (!mod) {
/* check for extension data */
r = ly_nested_ext_schema(parent, NULL, prefix, prefix_len, LY_VALUE_JSON, NULL, name, name_len, snode, ext);
if (r != LY_ENOT) {
/* success or error */
ret = r;
goto cleanup;
}
/* unknown module */
if (lydctx->parse_opts & LYD_PARSE_STRICT) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE, "No module named \"%.*s\" in the context.", (int)prefix_len, prefix);
ret = LY_EVALID;
goto cleanup;
}
if (!(lydctx->parse_opts & LYD_PARSE_OPAQ)) {
/* skip element with children */
ret = lydjson_data_skip(lydctx->jsonctx);
LY_CHECK_GOTO(ret, cleanup);
ret = LY_ENOT;
goto cleanup;
}
}
/* get the schema node */
if (mod && (!parent || parent->schema)) {
if (!parent && lydctx->ext) {
*snode = lysc_ext_find_node(lydctx->ext, mod, name, name_len, 0, getnext_opts);
} else {
*snode = lys_find_child(parent ? parent->schema : NULL, mod, name, name_len, 0, getnext_opts);
}
if (!*snode) {
/* check for extension data */
r = ly_nested_ext_schema(parent, NULL, prefix, prefix_len, LY_VALUE_JSON, NULL, name, name_len, snode, ext);
if (r != LY_ENOT) {
/* success or error */
ret = r;
goto cleanup;
}
/* unknown data node */
if (lydctx->parse_opts & LYD_PARSE_STRICT) {
if (parent) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE, "Node \"%.*s\" not found as a child of \"%s\" node.",
(int)name_len, name, LYD_NAME(parent));
} else if (lydctx->ext) {
if (lydctx->ext->argument) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE,
"Node \"%.*s\" not found in the \"%s\" %s extension instance.",
(int)name_len, name, lydctx->ext->argument, lydctx->ext->def->name);
} else {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE, "Node \"%.*s\" not found in the %s extension instance.",
(int)name_len, name, lydctx->ext->def->name);
}
} else {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE, "Node \"%.*s\" not found in the \"%s\" module.",
(int)name_len, name, mod->name);
}
ret = LY_EVALID;
goto cleanup;
} else if (!(lydctx->parse_opts & LYD_PARSE_OPAQ)) {
/* skip element with children */
ret = lydjson_data_skip(lydctx->jsonctx);
LY_CHECK_GOTO(ret, cleanup);
ret = LY_ENOT;
goto cleanup;
}
} else {
/* check that schema node is valid and can be used */
ret = lyd_parser_check_schema((struct lyd_ctx *)lydctx, *snode);
}
}
cleanup:
return ret;
}
/**
* @brief Check that the input data are parseable as the @p list.
*
* Checks for all the list's keys. Function does not revert the context state.
*
* @param[in] jsonctx JSON parser context.
* @param[in] list List schema node corresponding to the input data object.
* @return LY_SUCCESS in case the data are ok for the @p list
* @return LY_ENOT in case the input data are not sufficient to fully parse the list instance.
*/
static LY_ERR
lydjson_check_list(struct lyjson_ctx *jsonctx, const struct lysc_node *list)
{
LY_ERR ret = LY_SUCCESS;
enum LYJSON_PARSER_STATUS status = lyjson_ctx_status(jsonctx, 0);
struct ly_set key_set = {0};
const struct lysc_node *snode;
uint32_t i, status_count;
assert(list && (list->nodetype == LYS_LIST));
/* get all keys into a set (keys do not have if-features or anything) */
snode = NULL;
while ((snode = lys_getnext(snode, list, NULL, 0)) && (snode->flags & LYS_KEY)) {
ret = ly_set_add(&key_set, (void *)snode, 1, NULL);
LY_CHECK_GOTO(ret, cleanup);
}
if (status == LYJSON_OBJECT) {
status_count = jsonctx->status.count;
while (key_set.count && (status != LYJSON_OBJECT_CLOSED)) {
const char *name, *prefix;
size_t name_len, prefix_len;
ly_bool is_attr;
/* match the key */
snode = NULL;
lydjson_parse_name(jsonctx->value, jsonctx->value_len, &name, &name_len, &prefix, &prefix_len, &is_attr);
if (!is_attr && !prefix) {
for (i = 0; i < key_set.count; ++i) {
snode = (const struct lysc_node *)key_set.objs[i];
if (!ly_strncmp(snode->name, name, name_len)) {
break;
}
}
/* go into the item to a) process it as a key or b) start skipping it as another list child */
ret = lyjson_ctx_next(jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
if (snode) {
/* we have the key, validate the value */
if (status < LYJSON_NUMBER) {
/* not a terminal */
ret = LY_ENOT;
goto cleanup;
}
ret = lys_value_validate(NULL, snode, jsonctx->value, jsonctx->value_len, LY_VALUE_JSON, NULL);
LY_CHECK_GOTO(ret, cleanup);
/* key with a valid value, remove from the set */
ly_set_rm_index(&key_set, i, NULL);
}
} else {
/* start skipping the member we are not interested in */
ret = lyjson_ctx_next(jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
}
/* move to the next child */
while (status_count < jsonctx->status.count) {
ret = lyjson_ctx_next(jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
}
}
}
if (key_set.count) {
/* some keys are missing/did not validate */
ret = LY_ENOT;
}
cleanup:
ly_set_erase(&key_set, NULL);
return ret;
}
/**
* @brief Get the hint for the data type parsers according to the current JSON parser context.
*
* @param[in] lydctx JSON data parser context. The context is supposed to be on a value.
* @param[in,out] status Pointer to the current context status,
* in some circumstances the function manipulates with the context so the status is updated.
* @param[out] type_hint_p Pointer to the variable to store the result.
* @return LY_SUCCESS in case of success.
* @return LY_EINVAL in case of invalid context status not referring to a value.
*/
static LY_ERR
lydjson_value_type_hint(struct lyd_json_ctx *lydctx, enum LYJSON_PARSER_STATUS *status_p, uint32_t *type_hint_p)
{
*type_hint_p = 0;
if (*status_p == LYJSON_ARRAY) {
/* only [null] */
LY_CHECK_RET(lyjson_ctx_next(lydctx->jsonctx, status_p));
if (*status_p != LYJSON_NULL) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX_JSON,
"Expected JSON name/value or special name/[null], but input data contains name/[%s].",
lyjson_token2str(*status_p));
return LY_EINVAL;
}
LY_CHECK_RET(lyjson_ctx_next(lydctx->jsonctx, NULL));
if (lyjson_ctx_status(lydctx->jsonctx, 0) != LYJSON_ARRAY_CLOSED) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX_JSON, "Expected array end, but input data contains %s.",
lyjson_token2str(*status_p));
return LY_EINVAL;
}
*type_hint_p = LYD_VALHINT_EMPTY;
} else if (*status_p == LYJSON_STRING) {
*type_hint_p = LYD_VALHINT_STRING | LYD_VALHINT_NUM64;
} else if (*status_p == LYJSON_NUMBER) {
*type_hint_p = LYD_VALHINT_DECNUM;
} else if ((*status_p == LYJSON_FALSE) || (*status_p == LYJSON_TRUE)) {
*type_hint_p = LYD_VALHINT_BOOLEAN;
} else if (*status_p == LYJSON_NULL) {
*type_hint_p = 0;
} else {
LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX_JSON, "Unexpected input data %s.", lyjson_token2str(*status_p));
return LY_EINVAL;
}
return LY_SUCCESS;
}
/**
* @brief Check in advance if the input data are parsable according to the provided @p snode.
*
* Note that the checks are done only in case the LYD_PARSE_OPAQ is allowed. Otherwise the same checking
* is naturally done when the data are really parsed.
*
* @param[in] lydctx JSON data parser context. When the function returns, the context is in the same state
* as before calling, despite it is necessary to process input data for checking.
* @param[in] snode Schema node corresponding to the member currently being processed in the context.
* @param[out] type_hint_p Pointer to a variable to store detected value type hint in case of leaf or leaf-list.
* @return LY_SUCCESS in case the data are ok for the @p snode or the LYD_PARSE_OPAQ is not enabled.
* @return LY_ENOT in case the input data are not sufficient to fully parse the list instance
* @return LY_EINVAL in case of invalid leaf JSON encoding
* and they are expected to be parsed as opaq nodes.
*/
static LY_ERR
lydjson_data_check_opaq(struct lyd_json_ctx *lydctx, const struct lysc_node *snode, uint32_t *type_hint_p)
{
LY_ERR ret = LY_SUCCESS;
struct lyjson_ctx *jsonctx = lydctx->jsonctx;
enum LYJSON_PARSER_STATUS status;
assert(snode);
if (!(snode->nodetype & (LYD_NODE_TERM | LYS_LIST))) {
/* can always be parsed as a data node if we have the schema node */
return LY_SUCCESS;
}
/* backup parser */
lyjson_ctx_backup(jsonctx);
status = lyjson_ctx_status(jsonctx, 0);
if (lydctx->parse_opts & LYD_PARSE_OPAQ) {
/* check if the node is parseable. if not, NULL the snode to announce that it is supposed to be parsed
* as an opaq node */
switch (snode->nodetype) {
case LYS_LEAFLIST:
case LYS_LEAF:
/* value may not be valid in which case we parse it as an opaque node */
ret = lydjson_value_type_hint(lydctx, &status, type_hint_p);
if (ret) {
break;
}
if (lys_value_validate(NULL, snode, jsonctx->value, jsonctx->value_len, LY_VALUE_JSON, NULL)) {
ret = LY_ENOT;
}
break;
case LYS_LIST:
/* lists may not have all its keys */
if (lydjson_check_list(jsonctx, snode)) {
/* invalid list, parse as opaque if it misses/has invalid some keys */
ret = LY_ENOT;
}
break;
}
} else if (snode->nodetype & LYD_NODE_TERM) {
status = lyjson_ctx_status(jsonctx, 0);
ret = lydjson_value_type_hint(lydctx, &status, type_hint_p);
}
/* restore parser */
lyjson_ctx_restore(jsonctx);
return ret;
}
/**
* @brief Join the forward-referencing metadata with their target data nodes.
*
* Note that JSON encoding for YANG data allows forward-referencing metadata only for leafs/leaf-lists.
*
* @param[in] lydctx JSON data parser context.
* @param[in,out] first_p Pointer to the first sibling node variable (top-level or in a particular parent node)
* as a starting point to search for the metadata's target data node
* @return LY_SUCCESS on success
* @return LY_EVALID in case there are some metadata with unresolved target data node instance
*/
static LY_ERR
lydjson_metadata_finish(struct lyd_json_ctx *lydctx, struct lyd_node **first_p)
{
LY_ERR ret = LY_SUCCESS;
struct lyd_node *node, *attr, *next, *meta_iter;
struct lysc_ext_instance *ext;
uint64_t instance = 0;
const char *prev = NULL;
uint32_t log_location_items = 0;
/* finish linking metadata */
LY_LIST_FOR_SAFE(*first_p, next, attr) {
struct lyd_node_opaq *meta_container = (struct lyd_node_opaq *)attr;
uint64_t match = 0;
ly_bool is_attr;
const char *name, *prefix;
size_t name_len, prefix_len;
const struct lysc_node *snode;
if (attr->schema || (meta_container->name.name[0] != '@')) {
/* not an opaq metadata node */
continue;
}
LOG_LOCSET(NULL, attr, NULL, NULL);
log_location_items++;
if (prev != meta_container->name.name) {
/* metas' names are stored in dictionary, so checking pointers must works */
lydict_remove(lydctx->jsonctx->ctx, prev);
LY_CHECK_GOTO(ret = lydict_insert(lydctx->jsonctx->ctx, meta_container->name.name, 0, &prev), cleanup);
instance = 1;
} else {
instance++;
}
/* find the corresponding data node */
LY_LIST_FOR(*first_p, node) {
if (!node->schema) {
/* opaq node - we are going to put into it just a generic attribute. */
if (strcmp(&meta_container->name.name[1], ((struct lyd_node_opaq *)node)->name.name)) {
continue;
}
if (((struct lyd_node_opaq *)node)->hints & LYD_NODEHINT_LIST) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX, "Metadata container references a sibling list node %s.",
((struct lyd_node_opaq *)node)->name.name);
ret = LY_EVALID;
goto cleanup;
}
/* match */
match++;
if (match != instance) {
continue;
}
LY_LIST_FOR(meta_container->child, meta_iter) {
/* convert opaq node to a attribute of the opaq node */
struct lyd_node_opaq *meta = (struct lyd_node_opaq *)meta_iter;
ret = lyd_create_attr(node, NULL, lydctx->jsonctx->ctx, meta->name.name, strlen(meta->name.name),
meta->name.prefix, ly_strlen(meta->name.prefix), meta->name.module_name,
ly_strlen(meta->name.module_name), meta->value, ly_strlen(meta->value), NULL, LY_VALUE_JSON,
NULL, meta->hints);
LY_CHECK_GOTO(ret, cleanup);
}
/* done */
break;
} else {
/* this is the second time we are resolving the schema node, so it must succeed,
* but remember that snode can be still NULL */
lydjson_parse_name(meta_container->name.name, strlen(meta_container->name.name), &name, &name_len,
&prefix, &prefix_len, &is_attr);
assert(is_attr);
lydjson_get_snode(lydctx, is_attr, prefix, prefix_len, name, name_len, lyd_parent(*first_p), &snode, &ext);
if (snode != node->schema) {
continue;
}
/* match */
match++;
if (match != instance) {
continue;
}
LY_LIST_FOR(meta_container->child, meta_iter) {
/* convert opaq node to a metadata of the node */
struct lyd_node_opaq *meta = (struct lyd_node_opaq *)meta_iter;
struct lys_module *mod = NULL;
mod = ly_ctx_get_module_implemented(lydctx->jsonctx->ctx, meta->name.prefix);
if (mod) {
ret = lyd_parser_create_meta((struct lyd_ctx *)lydctx, node, NULL, mod,
meta->name.name, strlen(meta->name.name), meta->value, ly_strlen(meta->value),
NULL, LY_VALUE_JSON, NULL, meta->hints, node->schema);
LY_CHECK_GOTO(ret, cleanup);
} else if (lydctx->parse_opts & LYD_PARSE_STRICT) {
if (meta->name.prefix) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE,
"Unknown (or not implemented) YANG module \"%s\" of metadata \"%s%s%s\".",
meta->name.prefix, meta->name.prefix, ly_strlen(meta->name.prefix) ? ":" : "",
meta->name.name);
} else {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE, "Missing YANG module of metadata \"%s\".",
meta->name.name);
}
ret = LY_EVALID;
goto cleanup;
}
}
/* add/correct flags */
ret = lyd_parse_set_data_flags(node, &node->meta, (struct lyd_ctx *)lydctx, ext);
LY_CHECK_GOTO(ret, cleanup);
break;
}
}
if (match != instance) {
/* there is no corresponding data node for the metadata */
if (instance > 1) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE,
"Missing JSON data instance #%" PRIu64 " to be coupled with %s metadata.",
instance, meta_container->name.name);
} else {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE, "Missing JSON data instance to be coupled with %s metadata.",
meta_container->name.name);
}
ret = LY_EVALID;
} else {
/* remove the opaq attr */
if (attr == (*first_p)) {
*first_p = attr->next;
}
lyd_free_tree(attr);
}
LOG_LOCBACK(0, log_location_items, 0, 0);
log_location_items = 0;
}
cleanup:
lydict_remove(lydctx->jsonctx->ctx, prev);
LOG_LOCBACK(0, log_location_items, 0, 0);
return ret;
}
/**
* @brief Parse a metadata member.
*
* @param[in] lydctx JSON data parser context.
* @param[in] snode Schema node of the metadata parent.
* @param[in] node Parent node in case the metadata is not forward-referencing (only LYD_NODE_TERM)
* so the data node does not exists. In such a case the metadata is stored in the context for the later
* processing by lydjson_metadata_finish().
* @return LY_SUCCESS on success
* @return Various LY_ERR values in case of failure.
*/
static LY_ERR
lydjson_metadata(struct lyd_json_ctx *lydctx, const struct lysc_node *snode, struct lyd_node *node)
{
LY_ERR ret = LY_SUCCESS;
enum LYJSON_PARSER_STATUS status;
const char *expected;
ly_bool in_parent = 0;
const char *name, *prefix = NULL;
char *dynamic_prefname = NULL;
size_t name_len, prefix_len = 0;
struct lys_module *mod;
const struct ly_ctx *ctx = lydctx->jsonctx->ctx;
ly_bool is_attr = 0;
struct lyd_node *prev = node;
uint32_t instance = 0, val_hints;
uint16_t nodetype;
assert(snode || node);
nodetype = snode ? snode->nodetype : LYS_CONTAINER;
LOG_LOCSET(snode, NULL, NULL, NULL);
/* move to the second item in the name/X pair */
ret = lyjson_ctx_next(lydctx->jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
/* check attribute encoding */
switch (nodetype) {
case LYS_LEAFLIST:
expected = "@name/array of objects/nulls";
LY_CHECK_GOTO(status != LYJSON_ARRAY, representation_error);
next_entry:
instance++;
/* move into array/next entry */
ret = lyjson_ctx_next(lydctx->jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
if (status == LYJSON_ARRAY_CLOSED) {
/* no more metadata */
goto cleanup;
}
LY_CHECK_GOTO((status != LYJSON_OBJECT) && (status != LYJSON_NULL), representation_error);
if (!node || (node->schema != prev->schema)) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_REFERENCE, "Missing JSON data instance #%u of %s:%s to be coupled with metadata.",
instance, prev->schema->module->name, prev->schema->name);
ret = LY_EVALID;
goto cleanup;
}
if (status == LYJSON_NULL) {
/* continue with the next entry in the leaf-list array */
prev = node;
node = node->next;
goto next_entry;
}
break;
case LYS_LEAF:
case LYS_ANYXML:
expected = "@name/object";
LY_CHECK_GOTO(status != LYJSON_OBJECT, representation_error);
break;
case LYS_CONTAINER:
case LYS_LIST:
case LYS_ANYDATA:
case LYS_NOTIF:
case LYS_ACTION:
case LYS_RPC:
in_parent = 1;
expected = "@/object";
LY_CHECK_GOTO(status != LYJSON_OBJECT, representation_error);
break;
default:
LOGINT(ctx);
ret = LY_EINT;
goto cleanup;
}
/* process all the members inside a single metadata object */
assert(status == LYJSON_OBJECT);
while (status != LYJSON_OBJECT_CLOSED) {
LY_CHECK_GOTO(status != LYJSON_OBJECT, representation_error);
lydjson_parse_name(lydctx->jsonctx->value, lydctx->jsonctx->value_len, &name, &name_len, &prefix, &prefix_len, &is_attr);
lyjson_ctx_give_dynamic_value(lydctx->jsonctx, &dynamic_prefname);
if (!name_len) {
LOGVAL(ctx, LYVE_SYNTAX_JSON, "Metadata in JSON found with an empty name, followed by: %.10s", name);
ret = LY_EVALID;
goto cleanup;
} else if (!prefix_len) {
LOGVAL(ctx, LYVE_SYNTAX_JSON, "Metadata in JSON must be namespace-qualified, missing prefix for \"%.*s\".",
(int)lydctx->jsonctx->value_len, lydctx->jsonctx->value);
ret = LY_EVALID;
goto cleanup;
} else if (is_attr) {
LOGVAL(ctx, LYVE_SYNTAX_JSON, "Invalid format of the Metadata identifier in JSON, unexpected '@' in \"%.*s\"",
(int)lydctx->jsonctx->value_len, lydctx->jsonctx->value);
ret = LY_EVALID;
goto cleanup;
}
/* get the element module */
mod = ly_ctx_get_module_implemented2(ctx, prefix, prefix_len);
if (!mod) {
if (lydctx->parse_opts & LYD_PARSE_STRICT) {
LOGVAL(ctx, LYVE_REFERENCE, "Prefix \"%.*s\" of the metadata \"%.*s\" does not match any module in the context.",
(int)prefix_len, prefix, (int)name_len, name);
ret = LY_EVALID;
goto cleanup;
}
if (node->schema) {
/* skip element with children */
ret = lydjson_data_skip(lydctx->jsonctx);
LY_CHECK_GOTO(ret, cleanup);
status = lyjson_ctx_status(lydctx->jsonctx, 0);
/* end of the item */
continue;
}
assert(lydctx->parse_opts & LYD_PARSE_OPAQ);
}
/* get the value */
ret = lyjson_ctx_next(lydctx->jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
/* get value hints */
ret = lydjson_value_type_hint(lydctx, &status, &val_hints);
LY_CHECK_GOTO(ret, cleanup);
if (node->schema) {
/* create metadata */
ret = lyd_parser_create_meta((struct lyd_ctx *)lydctx, node, NULL, mod, name, name_len, lydctx->jsonctx->value,
lydctx->jsonctx->value_len, &lydctx->jsonctx->dynamic, LY_VALUE_JSON, NULL, val_hints, node->schema);
LY_CHECK_GOTO(ret, cleanup);
/* add/correct flags */
ret = lyd_parse_set_data_flags(node, &node->meta, (struct lyd_ctx *)lydctx, NULL);
LY_CHECK_GOTO(ret, cleanup);
} else {
/* create attribute */
const char *module_name;
size_t module_name_len;
lydjson_get_node_prefix(node, prefix, prefix_len, &module_name, &module_name_len);
/* attr2 is always changed to the created attribute */
ret = lyd_create_attr(node, NULL, lydctx->jsonctx->ctx, name, name_len, prefix, prefix_len, module_name,
module_name_len, lydctx->jsonctx->value, lydctx->jsonctx->value_len, &lydctx->jsonctx->dynamic,
LY_VALUE_JSON, NULL, val_hints);
LY_CHECK_GOTO(ret, cleanup);
}
/* next member */
ret = lyjson_ctx_next(lydctx->jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
LY_CHECK_GOTO((status != LYJSON_OBJECT) && (status != LYJSON_OBJECT_CLOSED), representation_error);
}
if (nodetype == LYS_LEAFLIST) {
/* continue by processing another metadata object for the following
* leaf-list instance since they are always instantiated in JSON array */
prev = node;
node = node->next;
goto next_entry;
}
/* success */
goto cleanup;
representation_error:
LOGVAL(ctx, LYVE_SYNTAX_JSON,
"The attribute(s) of %s \"%s\" is expected to be represented as JSON %s, but input data contains @%s/%s.",
lys_nodetype2str(nodetype), node ? LYD_NAME(node) : LYD_NAME(prev), expected, lyjson_token2str(status),
in_parent ? "" : "name");
ret = LY_EVALID;
cleanup:
free(dynamic_prefname);
LOG_LOCBACK(1, 0, 0, 0);
return ret;
}
/**
* @brief Eat the node pointed by @p node_p by inserting it into @p parent and maintain the @p first_p pointing
* to the first child node.
*
* @param[in] parent Parent node to insert to, can be NULL in case of top-level (or provided first_p).
* @param[in,out] first_p Pointer to the first sibling node in case of top-level.
* @param[in,out] node_p pointer to the new node to insert, after the insert is done, pointer is set to NULL.
* @param[in] last If set, always insert at the end.
* @param[in] ext Extension instance of @p node_p, if any.
*/
static void
lydjson_maintain_children(struct lyd_node *parent, struct lyd_node **first_p, struct lyd_node **node_p, ly_bool last,
struct lysc_ext_instance *ext)
{
if (*node_p) {
/* insert, keep first pointer correct */
if (ext) {
lyplg_ext_insert(parent, *node_p);
} else {
lyd_insert_node(parent, first_p, *node_p, last);
}
if (first_p) {
if (parent) {
*first_p = lyd_child(parent);
} else {
while ((*first_p)->prev->next) {
*first_p = (*first_p)->prev;
}
}
}
*node_p = NULL;
}
}
/**
* @brief Wrapper for ::lyd_create_opaq().
*
* @param[in] lydctx JSON data parser context.
* @param[in] name Name of the opaq node to create.
* @param[in] name_len Length of the @p name string.
* @param[in] prefix Prefix of the opaq node to create.
* @param[in] prefix_len Length of the @p prefx string.
* @param[in] parent Data parent of the opaq node to create, can be NULL in case of top level,
* but must be set if @p first is not.
* @param[in,out] status_inner_p In case of processing JSON array, this parameter points to a standalone
* context status of the array content. Otherwise, it is supposed to be the same as @p status_p.
* @param[out] node_p Pointer to the created opaq node.
* @return LY_ERR value.
*/
static LY_ERR
lydjson_create_opaq(struct lyd_json_ctx *lydctx, const char *name, size_t name_len, const char *prefix, size_t prefix_len,
struct lyd_node *parent, enum LYJSON_PARSER_STATUS *status_inner_p, struct lyd_node **node_p)
{
LY_ERR ret = LY_SUCCESS;
const char *value = NULL, *module_name;
size_t value_len = 0, module_name_len = 0;
ly_bool dynamic = 0;
uint32_t type_hint = 0;
if ((*status_inner_p != LYJSON_OBJECT) && (*status_inner_p != LYJSON_OBJECT_EMPTY)) {
/* prepare for creating opaq node with a value */
value = lydctx->jsonctx->value;
value_len = lydctx->jsonctx->value_len;
dynamic = lydctx->jsonctx->dynamic;
lydctx->jsonctx->dynamic = 0;
LY_CHECK_RET(lydjson_value_type_hint(lydctx, status_inner_p, &type_hint));
}
/* create node */
lydjson_get_node_prefix(parent, prefix, prefix_len, &module_name, &module_name_len);
ret = lyd_create_opaq(lydctx->jsonctx->ctx, name, name_len, prefix, prefix_len, module_name, module_name_len, value,
value_len, &dynamic, LY_VALUE_JSON, NULL, type_hint, node_p);
if (dynamic) {
free((char *)value);
}
return ret;
}
static LY_ERR lydjson_subtree_r(struct lyd_json_ctx *lydctx, struct lyd_node *parent, struct lyd_node **first_p,
struct ly_set *parsed);
/**
* @brief Parse opaq node from the input.
*
* In case of processing array, the whole array is being processed and the resulting @p node_p is the last item of the array.
*
* @param[in] lydctx JSON data parser context.
* @param[in] name Name of the opaq node to create.
* @param[in] name_len Length of the @p name string.
* @param[in] prefix Prefix of the opaq node to create.
* @param[in] prefix_len Length of the @p prefx string.
* @param[in] parent Data parent of the opaq node to create, can be NULL in case of top level,
* but must be set if @p first is not.
* @param[in,out] status_p Pointer to the current status of the parser context,
* since the function manipulates with the context and process the input, the status can be updated.
* @param[in,out] status_inner_p In case of processing JSON array, this parameter points to a standalone
* context status of the array content. Otherwise, it is supposed to be the same as @p status_p.
* @param[in,out] first_p First top-level/parent sibling, must be set if @p parent is not.
* @param[out] node_p Pointer to the created opaq node.
* @return LY_ERR value.
*/
static LY_ERR
lydjson_parse_opaq(struct lyd_json_ctx *lydctx, const char *name, size_t name_len, const char *prefix, size_t prefix_len,
struct lyd_node *parent, enum LYJSON_PARSER_STATUS *status_p, enum LYJSON_PARSER_STATUS *status_inner_p,
struct lyd_node **first_p, struct lyd_node **node_p)
{
LY_CHECK_RET(lydjson_create_opaq(lydctx, name, name_len, prefix, prefix_len, parent, status_inner_p, node_p));
if ((*status_p == LYJSON_ARRAY) && (*status_inner_p == LYJSON_NULL)) {
/* special array null value */
((struct lyd_node_opaq *)*node_p)->hints |= LYD_VALHINT_EMPTY;
/* must be the only item */
LY_CHECK_RET(lyjson_ctx_next(lydctx->jsonctx, status_inner_p));
if (*status_inner_p != LYJSON_ARRAY_CLOSED) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX, "Array \"null\" member with another member.");
return LY_EVALID;
}
goto finish;
}
while ((*status_p == LYJSON_ARRAY) || (*status_p == LYJSON_ARRAY_EMPTY)) {
/* process another instance of the same node */
if ((*status_inner_p == LYJSON_OBJECT) || (*status_inner_p == LYJSON_OBJECT_EMPTY)) {
/* array with objects, list */
((struct lyd_node_opaq *)*node_p)->hints |= LYD_NODEHINT_LIST;
/* but first process children of the object in the array */
while ((*status_inner_p != LYJSON_OBJECT_CLOSED) && (*status_inner_p != LYJSON_OBJECT_EMPTY)) {
LY_CHECK_RET(lydjson_subtree_r(lydctx, *node_p, lyd_node_child_p(*node_p), NULL));
*status_inner_p = lyjson_ctx_status(lydctx->jsonctx, 0);
}
} else {
/* array with values, leaf-list */
((struct lyd_node_opaq *)*node_p)->hints |= LYD_NODEHINT_LEAFLIST;
}
LY_CHECK_RET(lyjson_ctx_next(lydctx->jsonctx, status_inner_p));
if (*status_inner_p == LYJSON_ARRAY_CLOSED) {
goto finish;
}
/* continue with the next instance */
assert(node_p);
lydjson_maintain_children(parent, first_p, node_p, lydctx->parse_opts & LYD_PARSE_ORDERED ? 1 : 0, NULL);
LY_CHECK_RET(lydjson_create_opaq(lydctx, name, name_len, prefix, prefix_len, parent, status_inner_p, node_p));
}
if ((*status_p == LYJSON_OBJECT) || (*status_p == LYJSON_OBJECT_EMPTY)) {
/* process children */
while (*status_p != LYJSON_OBJECT_CLOSED && *status_p != LYJSON_OBJECT_EMPTY) {
LY_CHECK_RET(lydjson_subtree_r(lydctx, *node_p, lyd_node_child_p(*node_p), NULL));
*status_p = lyjson_ctx_status(lydctx->jsonctx, 0);
}
}
finish:
/* finish linking metadata */
return lydjson_metadata_finish(lydctx, lyd_node_child_p(*node_p));
}
/**
* @brief Move to the second item in the name/X pair and parse opaq node from the input.
*
* This function is basically the wrapper of the ::lydjson_parse_opaq().
* In addition, it calls the ::json_ctx_next() and prepares the status_inner_p parameter
* for ::lydjson_parse_opaq().
*
* @param[in] lydctx JSON data parser context.
* @param[in] name Name of the opaq node to create.
* @param[in] name_len Length of the @p name string.
* @param[in] prefix Prefix of the opaq node to create.
* @param[in] prefix_len Length of the @p prefx string.
* @param[in] parent Data parent of the opaq node to create, can be NULL in case of top level,
* but must be set if @p first is not.
* @param[in,out] status_p Pointer to the current status of the parser context,
* since the function manipulates with the context and process the input, the status can be updated.
* @param[in,out] first_p First top-level/parent sibling, must be set if @p parent is not.
* @param[out] node_p Pointer to the created opaq node.
* @return LY_ERR value.
*/
static LY_ERR
lydjson_ctx_next_parse_opaq(struct lyd_json_ctx *lydctx, const char *name, size_t name_len,
const char *prefix, size_t prefix_len, struct lyd_node *parent, enum LYJSON_PARSER_STATUS *status_p,
struct lyd_node **first_p, struct lyd_node **node_p)
{
enum LYJSON_PARSER_STATUS status_inner = 0;
/* move to the second item in the name/X pair */
LY_CHECK_RET(lyjson_ctx_next(lydctx->jsonctx, status_p));
if (*status_p == LYJSON_ARRAY) {
/* move into the array */
LY_CHECK_RET(lyjson_ctx_next(lydctx->jsonctx, &status_inner));
} else {
/* just a flag to pass correct parameters into lydjson_parse_opaq() */
status_inner = LYJSON_ERROR;
}
if (status_inner == LYJSON_ERROR) {
status_inner = *status_p;
}
/* parse opaq node from the input */
LY_CHECK_RET(lydjson_parse_opaq(lydctx, name, name_len, prefix, prefix_len, parent, status_p, &status_inner,
first_p, node_p));
return LY_SUCCESS;
}
/**
* @brief Process the attribute container (starting by @)
*
* @param[in] lydctx JSON data parser context.
* @param[in] attr_node The data node referenced by the attribute container, if already known.
* @param[in] snode The schema node of the data node referenced by the attribute container, if known.
* @param[in] name Name of the opaq node to create.
* @param[in] name_len Length of the @p name string.
* @param[in] prefix Prefix of the opaq node to create.
* @param[in] prefix_len Length of the @p prefx string.
* @param[in] parent Data parent of the opaq node to create, can be NULL in case of top level,
* but must be set if @p first is not.
* @param[in,out] status_p Pointer to the current status of the parser context,
* since the function manipulates with the context and process the input, the status can be updated.
* @param[in,out] first_p First top-level/parent sibling, must be set if @p parent is not.
* @param[out] node_p Pointer to the created opaq node.
* @return LY_ERR value.
*/
static LY_ERR
lydjson_parse_attribute(struct lyd_json_ctx *lydctx, struct lyd_node *attr_node, const struct lysc_node *snode,
const char *name, size_t name_len, const char *prefix, size_t prefix_len, struct lyd_node *parent,
enum LYJSON_PARSER_STATUS *status_p, struct lyd_node **first_p, struct lyd_node **node_p)
{
LY_ERR r;
const char *opaq_name;
size_t opaq_name_len;
if (!snode && !prefix) {
/* set the prefix */
if (parent) {
lydjson_get_node_prefix(parent, NULL, 0, &prefix, &prefix_len);
} else {
prefix = "";
prefix_len = 0;
}
}
/* parse as an attribute to a (opaque) node */
if (!attr_node) {
/* try to find the instance */
LY_LIST_FOR(*first_p, attr_node) {
if (snode) {
if (attr_node->schema) {
if (attr_node->schema == snode) {
break;
}
} else {
if (!strcmp(LYD_NAME(attr_node), snode->name) &&
!strcmp(((struct lyd_node_opaq *)attr_node)->name.module_name, snode->module->name)) {
break;
}
}
} else {
if (attr_node->schema) {
if (!ly_strncmp(LYD_NAME(attr_node), name, name_len) &&
!ly_strncmp(attr_node->schema->module->name, prefix, prefix_len)) {
break;
}
} else {
if (!ly_strncmp(LYD_NAME(attr_node), name, name_len) &&
!ly_strncmp(((struct lyd_node_opaq *)attr_node)->name.module_name, prefix, prefix_len)) {
break;
}
}
}
}
}
if (!attr_node) {
/* parse just as an opaq node with the name beginning with @,
* later we have to check that it belongs to a standard node
* and it is supposed to be converted to a metadata */
uint32_t prev_opts;
/* backup parser options to parse unknown metadata as opaq nodes and try to resolve them later */
prev_opts = lydctx->parse_opts;
lydctx->parse_opts &= ~LYD_PARSE_STRICT;
lydctx->parse_opts |= LYD_PARSE_OPAQ;
opaq_name = prefix ? prefix - 1 : name - 1;
opaq_name_len = prefix ? prefix_len + name_len + 2 : name_len + 1;
r = lydjson_ctx_next_parse_opaq(lydctx, opaq_name, opaq_name_len, NULL, 0, parent, status_p, first_p, node_p);
/* restore the parser options */
lydctx->parse_opts = prev_opts;
LY_CHECK_RET(r);
} else {
LY_CHECK_RET(lydjson_metadata(lydctx, snode, attr_node));
}
return LY_SUCCESS;
}
/**
* @brief Parse a single anydata/anyxml node.
*
* @param[in] lydctx JSON data parser context. When the function returns, the context is in the same state
* as before calling, despite it is necessary to process input data for checking.
* @param[in] snode Schema node corresponding to the member currently being processed in the context.
* @param[in] ext Extension instance of @p snode, if any.
* @param[in,out] status JSON parser status, is updated.
* @param[out] node Parsed data (or opaque) node.
* @return LY_SUCCESS if a node was successfully parsed,
* @return LY_ENOT in case of invalid JSON encoding,
* @return LY_ERR on other errors.
*/
static LY_ERR
lydjson_parse_any(struct lyd_json_ctx *lydctx, const struct lysc_node *snode, struct lysc_ext_instance *ext,
enum LYJSON_PARSER_STATUS *status, struct lyd_node **node)
{
LY_ERR r;
uint32_t prev_parse_opts, prev_int_opts;
struct ly_in in_start;
char *val;
struct lyd_node *tree = NULL;
assert(snode->nodetype & LYD_NODE_ANY);
/* status check according to allowed JSON types */
if (snode->nodetype == LYS_ANYXML) {
LY_CHECK_RET((*status != LYJSON_OBJECT) && (*status != LYJSON_OBJECT_EMPTY) && (*status != LYJSON_ARRAY) &&
(*status != LYJSON_NUMBER) && (*status != LYJSON_STRING) && (*status != LYJSON_FALSE) &&
(*status != LYJSON_TRUE) && (*status != LYJSON_NULL), LY_ENOT);
} else {
LY_CHECK_RET((*status != LYJSON_OBJECT) && (*status != LYJSON_OBJECT_EMPTY), LY_ENOT);
}
/* create any node */
switch (*status) {
case LYJSON_OBJECT:
/* parse any data tree with correct options, first backup the current options and then make the parser
* process data as opaq nodes */
prev_parse_opts = lydctx->parse_opts;
lydctx->parse_opts &= ~LYD_PARSE_STRICT;
lydctx->parse_opts |= LYD_PARSE_OPAQ | (ext ? LYD_PARSE_ONLY : 0);
prev_int_opts = lydctx->int_opts;
lydctx->int_opts |= LYD_INTOPT_ANY | LYD_INTOPT_WITH_SIBLINGS;
/* process the anydata content */
while (*status != LYJSON_OBJECT_CLOSED) {
LY_CHECK_RET(lydjson_subtree_r(lydctx, NULL, &tree, NULL));
*status = lyjson_ctx_status(lydctx->jsonctx, 0);
}
/* restore parser options */
lydctx->parse_opts = prev_parse_opts;
lydctx->int_opts = prev_int_opts;
/* finish linking metadata */
LY_CHECK_RET(lydjson_metadata_finish(lydctx, &tree));
LY_CHECK_RET(lyd_create_any(snode, tree, LYD_ANYDATA_DATATREE, 1, node));
break;
case LYJSON_ARRAY:
/* skip until the array end */
in_start = *lydctx->jsonctx->in;
LY_CHECK_RET(lydjson_data_skip(lydctx->jsonctx));
/* make a copy of the whole array and store it */
if (asprintf(&val, "[%.*s", (int)(lydctx->jsonctx->in->current - in_start.current), in_start.current) == -1) {
LOGMEM(lydctx->jsonctx->ctx);
return LY_EMEM;
}
r = lyd_create_any(snode, val, LYD_ANYDATA_JSON, 1, node);
if (r) {
free(val);
return r;
}
break;
case LYJSON_STRING:
/* string value */
if (lydctx->jsonctx->dynamic) {
LY_CHECK_RET(lyd_create_any(snode, lydctx->jsonctx->value, LYD_ANYDATA_STRING, 1, node));
lydctx->jsonctx->dynamic = 0;
} else {
val = strndup(lydctx->jsonctx->value, lydctx->jsonctx->value_len);
LY_CHECK_ERR_RET(!val, LOGMEM(lydctx->jsonctx->ctx), LY_EMEM);
r = lyd_create_any(snode, val, LYD_ANYDATA_STRING, 1, node);
if (r) {
free(val);
return r;
}
}
break;
case LYJSON_NUMBER:
case LYJSON_FALSE:
case LYJSON_TRUE:
/* JSON value */
assert(!lydctx->jsonctx->dynamic);
val = strndup(lydctx->jsonctx->value, lydctx->jsonctx->value_len);
LY_CHECK_ERR_RET(!val, LOGMEM(lydctx->jsonctx->ctx), LY_EMEM);
r = lyd_create_any(snode, val, LYD_ANYDATA_JSON, 1, node);
if (r) {
free(val);
return r;
}
break;
case LYJSON_NULL:
/* no value */
LY_CHECK_RET(lyd_create_any(snode, NULL, LYD_ANYDATA_JSON, 1, node));
break;
case LYJSON_OBJECT_EMPTY:
/* empty object */
LY_CHECK_RET(lyd_create_any(snode, NULL, LYD_ANYDATA_DATATREE, 1, node));
break;
default:
LOGINT_RET(lydctx->jsonctx->ctx);
}
return LY_SUCCESS;
}
/**
* @brief Parse a single instance of an inner node.
*
* @param[in] lydctx JSON data parser context.
* @param[in] snode Schema node corresponding to the member currently being processed in the context.
* @param[in] ext Extension instance of @p snode, if any.
* @param[in,out] status JSON parser status, is updated.
* @param[out] node Parsed data (or opaque) node.
* @return LY_SUCCESS if a node was successfully parsed,
* @return LY_ENOT in case of invalid JSON encoding,
* @return LY_ERR on other errors.
*/
static LY_ERR
lydjson_parse_instance_inner(struct lyd_json_ctx *lydctx, const struct lysc_node *snode, struct lysc_ext_instance *ext,
enum LYJSON_PARSER_STATUS *status, struct lyd_node **node)
{
LY_ERR ret = LY_SUCCESS;
uint32_t prev_parse_opts = lydctx->parse_opts;
LY_CHECK_RET((*status != LYJSON_OBJECT) && (*status != LYJSON_OBJECT_EMPTY), LY_ENOT);
/* create inner node */
LY_CHECK_RET(lyd_create_inner(snode, node));
/* use it for logging */
LOG_LOCSET(NULL, *node, NULL, NULL);
if (ext) {
/* only parse these extension data and validate afterwards */
lydctx->parse_opts |= LYD_PARSE_ONLY;
}
/* process children */
while ((*status != LYJSON_OBJECT_CLOSED) && (*status != LYJSON_OBJECT_EMPTY)) {
ret = lydjson_subtree_r(lydctx, *node, lyd_node_child_p(*node), NULL);
LY_CHECK_GOTO(ret, cleanup);
*status = lyjson_ctx_status(lydctx->jsonctx, 0);
}
/* finish linking metadata */
ret = lydjson_metadata_finish(lydctx, lyd_node_child_p(*node));
LY_CHECK_GOTO(ret, cleanup);
if (snode->nodetype == LYS_LIST) {
/* check all keys exist */
ret = lyd_parse_check_keys(*node);
LY_CHECK_GOTO(ret, cleanup);
}
if (!(lydctx->parse_opts & LYD_PARSE_ONLY)) {
/* new node validation, autodelete CANNOT occur, all nodes are new */
ret = lyd_validate_new(lyd_node_child_p(*node), snode, NULL, NULL);
LY_CHECK_GOTO(ret, cleanup);
/* add any missing default children */
ret = lyd_new_implicit_r(*node, lyd_node_child_p(*node), NULL, NULL, &lydctx->node_when,
&lydctx->node_types, &lydctx->ext_node,
(lydctx->val_opts & LYD_VALIDATE_NO_STATE) ? LYD_IMPLICIT_NO_STATE : 0, NULL);
LY_CHECK_GOTO(ret, cleanup);
}
cleanup:
lydctx->parse_opts = prev_parse_opts;
LOG_LOCBACK(0, 1, 0, 0);
return ret;
}
/**
* @brief Parse a single instance of a node.
*
* @param[in] lydctx JSON data parser context. When the function returns, the context is in the same state
* as before calling, despite it is necessary to process input data for checking.
* @param[in] parent Data parent of the subtree, must be set if @p first is not.
* @param[in,out] first_p Pointer to the variable holding the first top-level sibling, must be set if @p parent is not.
* @param[in] snode Schema node corresponding to the member currently being processed in the context.
* @param[in] ext Extension instance of @p snode, if any.
* @param[in] name Parsed JSON node name.
* @param[in] name_len Lenght of @p name.
* @param[in] prefix Parsed JSON node prefix.
* @param[in] prefix_len Length of @p prefix.
* @param[in,out] status JSON parser status, is updated.
* @param[out] node Parsed data (or opaque) node.
* @return LY_SUCCESS if a node was successfully parsed,
* @return LY_ENOT in case of invalid JSON encoding,
* @return LY_ERR on other errors.
*/
static LY_ERR
lydjson_parse_instance(struct lyd_json_ctx *lydctx, struct lyd_node *parent, struct lyd_node **first_p,
const struct lysc_node *snode, struct lysc_ext_instance *ext, const char *name, size_t name_len,
const char *prefix, size_t prefix_len, enum LYJSON_PARSER_STATUS *status, struct lyd_node **node)
{
LY_ERR ret = LY_SUCCESS;
uint32_t type_hints = 0;
LOG_LOCSET(snode, NULL, NULL, NULL);
ret = lydjson_data_check_opaq(lydctx, snode, &type_hints);
if (ret == LY_SUCCESS) {
assert(snode->nodetype & (LYD_NODE_TERM | LYD_NODE_INNER | LYD_NODE_ANY));
if (snode->nodetype & LYD_NODE_TERM) {
if ((*status != LYJSON_ARRAY) && (*status != LYJSON_NUMBER) && (*status != LYJSON_STRING) &&
(*status != LYJSON_FALSE) && (*status != LYJSON_TRUE) && (*status != LYJSON_NULL)) {
ret = LY_ENOT;
goto cleanup;
}
/* create terminal node */
LY_CHECK_GOTO(ret = lyd_parser_create_term((struct lyd_ctx *)lydctx, snode, lydctx->jsonctx->value,
lydctx->jsonctx->value_len, &lydctx->jsonctx->dynamic, LY_VALUE_JSON, NULL, type_hints, node), cleanup);
/* move JSON parser */
if (*status == LYJSON_ARRAY) {
/* only [null], 2 more moves are needed */
LY_CHECK_GOTO(ret = lyjson_ctx_next(lydctx->jsonctx, status), cleanup);
assert(*status == LYJSON_NULL);
LY_CHECK_GOTO(ret = lyjson_ctx_next(lydctx->jsonctx, status), cleanup);
assert(*status == LYJSON_ARRAY_CLOSED);
}
} else if (snode->nodetype & LYD_NODE_INNER) {
/* create inner node */
LY_CHECK_GOTO(ret = lydjson_parse_instance_inner(lydctx, snode, ext, status, node), cleanup);
} else {
/* create any node */
LY_CHECK_GOTO(ret = lydjson_parse_any(lydctx, snode, ext, status, node), cleanup);
}
/* add/correct flags */
LY_CHECK_GOTO(ret = lyd_parse_set_data_flags(*node, &(*node)->meta, (struct lyd_ctx *)lydctx, ext), cleanup);
if (!(lydctx->parse_opts & LYD_PARSE_ONLY)) {
/* store for ext instance node validation, if needed */
LY_CHECK_GOTO(ret = lyd_validate_node_ext(*node, &lydctx->ext_node), cleanup);
}
} else if (ret == LY_ENOT) {
/* parse it again as an opaq node */
LY_CHECK_GOTO(ret = lydjson_parse_opaq(lydctx, name, name_len, prefix, prefix_len, parent, status, status,
first_p, node), cleanup);
if (snode->nodetype == LYS_LIST) {
((struct lyd_node_opaq *)*node)->hints |= LYD_NODEHINT_LIST;
} else if (snode->nodetype == LYS_LEAFLIST) {
((struct lyd_node_opaq *)*node)->hints |= LYD_NODEHINT_LEAFLIST;
}
} else {
/* error */
goto cleanup;
}
cleanup:
LOG_LOCBACK(1, 0, 0, 0);
return ret;
}
/**
* @brief Parse JSON subtree. All leaf-list and list instances of a node are considered one subtree.
*
* @param[in] lydctx JSON data parser context.
* @param[in] parent Data parent of the subtree, must be set if @p first is not.
* @param[in,out] first_p Pointer to the variable holding the first top-level sibling, must be set if @p parent is not.
* @param[in,out] parsed Optional set to add all the parsed siblings into.
* @return LY_ERR value.
*/
static LY_ERR
lydjson_subtree_r(struct lyd_json_ctx *lydctx, struct lyd_node *parent, struct lyd_node **first_p, struct ly_set *parsed)
{
LY_ERR ret = LY_SUCCESS, r;
enum LYJSON_PARSER_STATUS status = lyjson_ctx_status(lydctx->jsonctx, 0);
const char *name, *prefix = NULL, *expected = NULL;
size_t name_len, prefix_len = 0;
ly_bool is_meta = 0, parse_subtree;
const struct lysc_node *snode = NULL;
struct lysc_ext_instance *ext;
struct lyd_node *node = NULL, *attr_node = NULL;
const struct ly_ctx *ctx = lydctx->jsonctx->ctx;
char *value = NULL;
assert(parent || first_p);
assert(status == LYJSON_OBJECT);
parse_subtree = lydctx->parse_opts & LYD_PARSE_SUBTREE ? 1 : 0;
/* all descendants should be parsed */
lydctx->parse_opts &= ~LYD_PARSE_SUBTREE;
/* process the node name */
lydjson_parse_name(lydctx->jsonctx->value, lydctx->jsonctx->value_len, &name, &name_len, &prefix, &prefix_len, &is_meta);
lyjson_ctx_give_dynamic_value(lydctx->jsonctx, &value);
if (!is_meta || name_len || prefix_len) {
/* get the schema node */
r = lydjson_get_snode(lydctx, is_meta, prefix, prefix_len, name, name_len, parent, &snode, &ext);
if (r == LY_ENOT) {
/* data parsed */
goto cleanup;
}
LY_CHECK_ERR_GOTO(r, ret = r, cleanup);
if (!snode) {
/* we will not be parsing it as metadata */
is_meta = 0;
}
}
if (is_meta) {
/* parse as metadata */
if (!name_len && !prefix_len) {
/* parent's metadata without a name - use the schema from the parent */
if (!parent) {
LOGVAL(ctx, LYVE_SYNTAX_JSON,
"Invalid metadata format - \"@\" can be used only inside anydata, container or list entries.");
ret = LY_EVALID;
goto cleanup;
}
attr_node = parent;
snode = attr_node->schema;
}
ret = lydjson_parse_attribute(lydctx, attr_node, snode, name, name_len, prefix, prefix_len, parent, &status,
first_p, &node);
LY_CHECK_GOTO(ret, cleanup);
} else if (!snode) {
/* parse as an opaq node */
assert((lydctx->parse_opts & LYD_PARSE_OPAQ) || (lydctx->int_opts));
/* opaq node cannot have an empty string as the name. */
if (name_len == 0) {
LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX_JSON, "A JSON object member name cannot be a zero-length string.");
ret = LY_EVALID;
goto cleanup;
}
/* move to the second item in the name/X pair and parse opaq */
ret = lydjson_ctx_next_parse_opaq(lydctx, name, name_len, prefix, prefix_len, parent, &status, first_p, &node);
LY_CHECK_GOTO(ret, cleanup);
} else {
/* parse as a standard lyd_node but it can still turn out to be an opaque node */
/* move to the second item in the name/X pair */
LY_CHECK_GOTO(ret = lyjson_ctx_next(lydctx->jsonctx, &status), cleanup);
/* first check the expected representation according to the nodetype and then continue with the content */
switch (snode->nodetype) {
case LYS_LEAFLIST:
case LYS_LIST:
if (snode->nodetype == LYS_LEAFLIST) {
expected = "name/array of values";
} else {
expected = "name/array of objects";
}
if (status == LYJSON_ARRAY_EMPTY) {
/* no instances, skip */
break;
}
LY_CHECK_GOTO(status != LYJSON_ARRAY, representation_error);
/* move into array */
ret = lyjson_ctx_next(lydctx->jsonctx, &status);
LY_CHECK_GOTO(ret, cleanup);
/* process all the values/objects */
do {
ret = lydjson_parse_instance(lydctx, parent, first_p, snode, ext, name, name_len, prefix, prefix_len,
&status, &node);
if (ret == LY_ENOT) {
goto representation_error;
} else if (ret) {
goto cleanup;
}
lydjson_maintain_children(parent, first_p, &node, lydctx->parse_opts & LYD_PARSE_ORDERED ? 1 : 0, ext);
/* move after the item(s) */
LY_CHECK_GOTO(ret = lyjson_ctx_next(lydctx->jsonctx, &status), cleanup);
} while (status != LYJSON_ARRAY_CLOSED);
break;
case LYS_LEAF:
case LYS_CONTAINER:
case LYS_NOTIF:
case LYS_ACTION:
case LYS_RPC:
case LYS_ANYDATA:
case LYS_ANYXML:
if ((snode->nodetype == LYS_LEAF) || (snode->nodetype == LYS_ANYXML)) {
if (status == LYJSON_ARRAY) {
expected = "name/[null]";
} else {
expected = "name/value";
}
} else {
expected = "name/object";
}
/* process the value/object */
ret = lydjson_parse_instance(lydctx, parent, first_p, snode, ext, name, name_len, prefix, prefix_len,
&status, &node);
if (ret == LY_ENOT) {
goto representation_error;
} else if (ret) {
goto cleanup;
}
if (snode->nodetype & (LYS_RPC | LYS_ACTION | LYS_NOTIF)) {
/* rememeber the RPC/action/notification */
lydctx->op_node = node;
}
break;
}
}
/* finally connect the parsed node */
lydjson_maintain_children(parent, first_p, &node, lydctx->parse_opts & LYD_PARSE_ORDERED ? 1 : 0, ext);
/* rememeber a successfully parsed node */
if (parsed && node) {
ly_set_add(parsed, node, 1, NULL);
}
if (!parse_subtree) {
/* move after the item(s) */
LY_CHECK_GOTO(ret = lyjson_ctx_next(lydctx->jsonctx, &status), cleanup);
}
/* success */
goto cleanup;
representation_error:
LOGVAL(ctx, LYVE_SYNTAX_JSON, "The %s \"%s\" is expected to be represented as JSON %s, but input data contains name/%s.",
lys_nodetype2str(snode->nodetype), snode->name, expected, lyjson_token2str(status));
ret = LY_EVALID;
cleanup:
free(value);
lyd_free_tree(node);
return ret;
}
/**
* @brief Common start of JSON parser processing different types of the input data.
*
* @param[in] ctx libyang context
* @param[in] in Input structure.
* @param[in] parse_opts Options for parser, see @ref dataparseroptions.
* @param[in] val_opts Options for the validation phase, see @ref datavalidationoptions.
* @param[out] lydctx_p Data parser context to finish validation.
* @param[out] status Storage for the current context's status
* @return LY_ERR value.
*/
static LY_ERR
lyd_parse_json_init(const struct ly_ctx *ctx, struct ly_in *in, uint32_t parse_opts, uint32_t val_opts,
struct lyd_json_ctx **lydctx_p, enum LYJSON_PARSER_STATUS *status)
{
LY_ERR ret = LY_SUCCESS;
struct lyd_json_ctx *lydctx;
size_t i;
ly_bool subtree;
assert(lydctx_p);
assert(status);
/* init context */
lydctx = calloc(1, sizeof *lydctx);
LY_CHECK_ERR_RET(!lydctx, LOGMEM(ctx), LY_EMEM);
lydctx->parse_opts = parse_opts;
lydctx->val_opts = val_opts;
lydctx->free = lyd_json_ctx_free;
/* starting top-level */
for (i = 0; in->current[i] != '\0' && is_jsonws(in->current[i]); i++) {
if (in->current[i] == '\n') {
/* new line */
LY_IN_NEW_LINE(in);
}
}
subtree = (parse_opts & LYD_PARSE_SUBTREE) ? 1 : 0;
LY_CHECK_ERR_RET(ret = lyjson_ctx_new(ctx, in, subtree, &lydctx->jsonctx), free(lydctx), ret);
*status = lyjson_ctx_status(lydctx->jsonctx, 0);
if ((*status == LYJSON_END) || (*status == LYJSON_OBJECT_EMPTY) || (*status == LYJSON_OBJECT)) {
*lydctx_p = lydctx;
return LY_SUCCESS;
} else {
/* expecting top-level object */
LOGVAL(ctx, LYVE_SYNTAX_JSON, "Expected top-level JSON object, but %s found.", lyjson_token2str(*status));
*lydctx_p = NULL;
lyd_json_ctx_free((struct lyd_ctx *)lydctx);
return LY_EVALID;
}
}
LY_ERR
lyd_parse_json(const struct ly_ctx *ctx, const struct lysc_ext_instance *ext, struct lyd_node *parent,
struct lyd_node **first_p, struct ly_in *in, uint32_t parse_opts, uint32_t val_opts, uint32_t int_opts,
struct ly_set *parsed, ly_bool *subtree_sibling, struct lyd_ctx **lydctx_p)
{
LY_ERR rc = LY_SUCCESS;
struct lyd_json_ctx *lydctx = NULL;
enum LYJSON_PARSER_STATUS status;
rc = lyd_parse_json_init(ctx, in, parse_opts, val_opts, &lydctx, &status);
LY_CHECK_GOTO(rc || status == LYJSON_END || status == LYJSON_OBJECT_EMPTY, cleanup);
assert(status == LYJSON_OBJECT);
lydctx->int_opts = int_opts;
lydctx->ext = ext;
/* find the operation node if it exists already */
LY_CHECK_GOTO(rc = lyd_parser_find_operation(parent, int_opts, &lydctx->op_node), cleanup);
/* read subtree(s) */
while (lydctx->jsonctx->in->current[0] && (status != LYJSON_OBJECT_CLOSED)) {
rc = lydjson_subtree_r(lydctx, parent, first_p, parsed);
LY_CHECK_GOTO(rc, cleanup);
status = lyjson_ctx_status(lydctx->jsonctx, 0);
if (!(int_opts & LYD_INTOPT_WITH_SIBLINGS)) {
break;
}
}
if ((int_opts & LYD_INTOPT_NO_SIBLINGS) && lydctx->jsonctx->in->current[0] &&
(lyjson_ctx_status(lydctx->jsonctx, 0) != LYJSON_OBJECT_CLOSED)) {
LOGVAL(ctx, LYVE_SYNTAX, "Unexpected sibling node.");
rc = LY_EVALID;
goto cleanup;
}
if ((int_opts & (LYD_INTOPT_RPC | LYD_INTOPT_ACTION | LYD_INTOPT_NOTIF | LYD_INTOPT_REPLY)) && !lydctx->op_node) {
LOGVAL(ctx, LYVE_DATA, "Missing the operation node.");
rc = LY_EVALID;
goto cleanup;
}
/* finish linking metadata */
rc = lydjson_metadata_finish(lydctx, parent ? lyd_node_child_p(parent) : first_p);
LY_CHECK_GOTO(rc, cleanup);
if (parse_opts & LYD_PARSE_SUBTREE) {
/* check for a sibling object */
assert(subtree_sibling);
if (lydctx->jsonctx->in->current[0] == ',') {
*subtree_sibling = 1;
/* move to the next object */
ly_in_skip(lydctx->jsonctx->in, 1);
} else {
*subtree_sibling = 0;
}
}
cleanup:
/* there should be no unresolved types stored */
assert(!(parse_opts & LYD_PARSE_ONLY) || !lydctx || (!lydctx->node_types.count && !lydctx->meta_types.count &&
!lydctx->node_when.count));
if (rc) {
lyd_json_ctx_free((struct lyd_ctx *)lydctx);
} else {
*lydctx_p = (struct lyd_ctx *)lydctx;
/* the JSON context is no more needed, freeing it also stops logging line numbers which would be confusing now */
lyjson_ctx_free(lydctx->jsonctx);
lydctx->jsonctx = NULL;
}
return rc;
}