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/**
@file rexmpp_roster.c
@brief Roster-related functions.
@author defanor <defanor@uberspace.net>
@date 2020
@copyright MIT license.
*/
#include "rexmpp.h"
#include <syslog.h>
#include <string.h>
#include <libxml/tree.h>
#include <libxml/xmlsave.h>
xmlNodePtr rexmpp_roster_find_item (rexmpp_t *s,
const char *jid,
xmlNodePtr *prev_item)
{
xmlNodePtr prev = NULL, cur = s->roster_items;
while (cur != NULL) {
char *cur_jid = xmlGetProp(cur, "jid");
if (cur_jid == NULL) {
rexmpp_log(s, LOG_ALERT, "No jid found in a roster item.");
return NULL;
}
int match = (strcmp(cur_jid, jid) == 0);
free(cur_jid);
if (match) {
if (prev_item != NULL) {
*prev_item = prev;
}
return cur;
}
prev = cur;
cur = cur->next;
}
return NULL;
}
rexmpp_err_t rexmpp_modify_roster (rexmpp_t *s, xmlNodePtr item) {
rexmpp_err_t ret = REXMPP_SUCCESS;
if (! rexmpp_xml_match(item, "jabber:iq:roster", "item")) {
rexmpp_log(s, LOG_ERR, "No roster item.");
return REXMPP_E_PARAM;
}
char *subscription = xmlGetProp(item, "subscription");
char *jid = xmlGetProp(item, "jid");
if (subscription != NULL && strcmp(subscription, "remove") == 0) {
/* Delete the item. */
xmlNodePtr prev, cur;
cur = rexmpp_roster_find_item(s, jid, &prev);
if (cur != NULL) {
if (prev != NULL) {
prev->next = cur->next;
} else {
s->roster_items = cur->next;
}
xmlFreeNode(cur);
} else {
ret = REXMPP_E_ROSTER_ITEM_NOT_FOUND;
}
} else {
/* Add or modify the item. */
xmlNodePtr cur, prev;
cur = rexmpp_roster_find_item(s, jid, &prev);
/* Remove the item if it was in the roster before. */
if (cur != NULL) {
if (prev != NULL) {
prev->next = cur->next;
} else {
s->roster_items = cur->next;
}
xmlFreeNode(cur);
}
/* Add the new item. */
xmlNodePtr new_item = xmlCopyNode(item, 1);
new_item->next = s->roster_items;
s->roster_items = new_item;
}
free(jid);
if (subscription != NULL) {
free(subscription);
}
if (s->roster_modify_cb != NULL) {
s->roster_modify_cb(s, item);
}
return ret;
}
void rexmpp_roster_set (rexmpp_t *s, xmlNodePtr query) {
if (s->roster_items != NULL) {
xmlFreeNodeList(s->roster_items);
}
if (s->roster_ver != NULL) {
free(s->roster_ver);
}
s->roster_ver = xmlGetProp(query, "ver");
s->roster_items = xmlCopyNodeList(xmlFirstElementChild(query));
if (s->roster_modify_cb != NULL) {
xmlNodePtr item;
for (item = xmlFirstElementChild(query);
item != NULL;
item = xmlNextElementSibling(item))
{
s->roster_modify_cb(s, item);
}
}
}
void rexmpp_roster_cache_read (rexmpp_t *s) {
if (s->roster_cache_file == NULL) {
rexmpp_log(s, LOG_WARNING, "No roster cache file path is set.");
return;
}
xmlDocPtr doc = xmlReadFile(s->roster_cache_file, "utf-8", XML_PARSE_NONET);
xmlNodePtr query = xmlDocGetRootElement(doc);
rexmpp_roster_set(s, query);
xmlFreeDoc(doc);
}
void rexmpp_roster_cache_write (rexmpp_t *s) {
if (s->roster_cache_file == NULL) {
rexmpp_log(s, LOG_WARNING, "No roster cache file path is set.");
return;
}
xmlDocPtr doc = xmlNewDoc("1.0");
xmlNodePtr query = xmlNewDocNode(doc, NULL, "query", NULL);
xmlDocSetRootElement(doc, query);
xmlNewNs(query, "jabber:iq:roster", NULL);
if (s->roster_ver != NULL) {
xmlNewProp(query, "ver", s->roster_ver);
}
if (s->roster_items != NULL) {
xmlAddChild(query, xmlDocCopyNodeList(doc, s->roster_items));
}
xmlSaveFileEnc(s->roster_cache_file, doc, "utf-8");
xmlFreeDoc(doc);
}
void rexmpp_iq_roster_get (rexmpp_t *s,
xmlNodePtr req,
xmlNodePtr response,
int success)
{
(void)req; /* Nothing interesting in the request. */
if (! success) {
rexmpp_log(s, LOG_ERR, "Roster loading failed.");
return;
}
xmlNodePtr query = xmlFirstElementChild(response);
if (! rexmpp_xml_match(query, "jabber:iq:roster", "query")) {
rexmpp_log(s, LOG_DEBUG, "No roster query in reply.");
return;
}
rexmpp_roster_set(s, query);
if (s->roster_cache_file != NULL) {
rexmpp_roster_cache_write(s);
}
}
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