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/*
* Copyright 2004-2025 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#include <stdio.h> // NULL
#include <stdlib.h> // free()
#include <glib.h> // GList, GHashTable, etc.
#include <libxml/tree.h> // xmlNode
#include <crm/crm.h>
#include <crm/common/xml.h> // PCMK_XA_ID_REF
/*!
* \internal
* \brief Add an XML ID reference to a table
*
* \param[in,out] table Table of ID references to add to
* \param[in] id ID of primary element being referred to
* \param[in] referrer ID of element referring to \p id
*
* \note This refers to an ID reference in general, not necessarily connected to
* an id-ref attribute.
*/
void
pcmk__add_idref(GHashTable *table, const char *id, const char *referrer)
{
pcmk__idref_t *idref = NULL;
pcmk__assert((table != NULL) && (id != NULL) && (referrer != NULL));
idref = g_hash_table_lookup(table, id);
if (idref == NULL) {
idref = pcmk__assert_alloc(1, sizeof(pcmk__idref_t));
idref->id = pcmk__str_copy(id);
g_hash_table_insert(table, pcmk__str_copy(id), idref);
}
for (GList *iter = idref->refs; iter != NULL; iter = iter->next) {
if (pcmk__str_eq(referrer, (const char *) iter->data,
pcmk__str_none)) {
return; // Already present
}
}
idref->refs = g_list_append(idref->refs, pcmk__str_copy(referrer));
crm_trace("Added ID %s referrer %s", id, referrer);
}
/*!
* \internal
* \brief Free a pcmk__idref_t
*
* \param[in,out] data pcmk__idref_t to free
*/
void
pcmk__free_idref(gpointer data)
{
pcmk__idref_t *idref = data;
if (idref != NULL) {
free(idref->id);
g_list_free_full(idref->refs, free);
free(idref);
}
}
/*!
* \internal
* \brief Get the XML element whose \c PCMK_XA_ID matches an \c PCMK_XA_ID_REF
*
* \param[in] xml Element whose \c PCMK_XA_ID_REF attribute to check
* \param[in] search Node whose document to search for node with matching
* \c PCMK_XA_ID (\c NULL to use \p xml)
*
* \return If \p xml has a \c PCMK_XA_ID_REF attribute, node in
* <tt>search</tt>'s document whose \c PCMK_XA_ID attribute matches;
* otherwise, \p xml
*/
xmlNode *
pcmk__xe_resolve_idref(xmlNode *xml, xmlNode *search)
{
char *xpath = NULL;
const char *ref = NULL;
xmlNode *result = NULL;
if (xml == NULL) {
return NULL;
}
ref = crm_element_value(xml, PCMK_XA_ID_REF);
if (ref == NULL) {
return xml;
}
if (search == NULL) {
search = xml;
}
xpath = crm_strdup_printf("//%s[@" PCMK_XA_ID "='%s']", xml->name, ref);
result = pcmk__xpath_find_one(search->doc, xpath, LOG_DEBUG);
if (result == NULL) {
// Not possible with schema validation enabled
pcmk__config_err("Ignoring invalid %s configuration: "
PCMK_XA_ID_REF " '%s' does not reference "
"a valid object " QB_XS " xpath=%s",
xml->name, ref, xpath);
}
free(xpath);
return result;
}
/*!
* \internal
* \brief Get list of resolved ID references for child elements of given element
*
* \param[in] xml XML element to get list for
* \param[in] element_name If not NULL, list only children of this element type
*
* \return Unordered list of XML elements corresponding to child elements of
* \p xml with any ID references resolved to the referenced elements
*/
GList *
pcmk__xe_dereference_children(const xmlNode *xml, const char *element_name)
{
GList *result = NULL;
if (xml == NULL) {
return NULL;
}
for (xmlNode *child = pcmk__xe_first_child(xml, element_name, NULL, NULL);
child != NULL; child = pcmk__xe_next(child, element_name)) {
xmlNode *resolved = pcmk__xe_resolve_idref(child, NULL);
if (resolved == NULL) {
continue; // Not possible with schema validation enabled
}
result = g_list_prepend(result, resolved);
}
return result;
}
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