/* --------------------------------------------------------------------------
 *
 * License
 *
 * The contents of this file are subject to the Jabber Open Source License
 * Version 1.0 (the "JOSL").  You may not copy or use this file, in either
 * source code or executable form, except in compliance with the JOSL. You
 * may obtain a copy of the JOSL at http://www.jabber.org/ or at
 * http://www.opensource.org/.  
 *
 * Software distributed under the JOSL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the JOSL
 * for the specific language governing rights and limitations under the
 * JOSL.
 *
 * Copyrights
 * 
 * Portions created by or assigned to Jabber.com, Inc. are 
 * Copyright (c) 1999-2002 Jabber.com, Inc.  All Rights Reserved.  Contact
 * information for Jabber.com, Inc. is available at http://www.jabber.com/.
 *
 * Portions Copyright (c) 1998-1999 Jeremie Miller.
 * 
 * Acknowledgements
 * 
 * Special thanks to the Jabber Open Source Contributors for their
 * suggestions and support of Jabber.
 * 
 * Alternatively, the contents of this file may be used under the terms of the
 * GNU General Public License Version 2 or later (the "GPL"), in which case
 * the provisions of the GPL are applicable instead of those above.  If you
 * wish to allow use of your version of this file only under the terms of the
 * GPL and not to allow others to use your version of this file under the JOSL,
 * indicate your decision by deleting the provisions above and replace them
 * with the notice and other provisions required by the GPL.  If you do not
 * delete the provisions above, a recipient may use your version of this file
 * under either the JOSL or the GPL. 
 * 
 * 
 * --------------------------------------------------------------------------*/

#include "lib.h"

jid jid_safe(jid id)
{
    unsigned char *str;

    if(strlen(id->server) == 0 || strlen(id->server) > 255)
        return NULL;

    /* lowercase the hostname, make sure it's valid characters */
    for(str = id->server; *str != '\0'; str++)
    {
        *str = tolower(*str);
        if(!(isalnum(*str) || *str == '.' || *str == '-' || *str == '_')) return NULL;
    }

    /* cut off the user */
    if(id->user != NULL && strlen(id->user) > 64)
        id->user[64] = '\0';

    /* check for low and invalid ascii characters in the username */
    if(id->user != NULL)
        for(str = id->user; *str != '\0'; str++)
            if(*str <= 32 || *str == ':' || *str == '@' || *str == '<' || *str == '>' || *str == '\'' || *str == '"' || *str == '&') return NULL;

    return id;
}

jid jid_new(pool p, char *idstr)
{
    char *server, *resource, *type, *str;
    jid id;

    if(p == NULL || idstr == NULL || strlen(idstr) == 0)
        return NULL;

    /* user@server/resource */

    str = pstrdup(p, idstr);

    id = pmalloco(p,sizeof(struct jid_struct));
    id->p = p;

    resource = strstr(str,"/");
    if(resource != NULL)
    {
        *resource = '\0';
        ++resource;
        if(strlen(resource) > 0)
            id->resource = resource;
    }else{
        resource = str + strlen(str); /* point to end */
    }

    type = strstr(str,":");
    if(type != NULL && type < resource)
    {
        *type = '\0';
        ++type;
        str = type; /* ignore the type: prefix */
    }

    server = strstr(str,"@");
    if(server == NULL || server > resource)
    { /* if there's no @, it's just the server address */
        id->server = str;
    }else{
        *server = '\0';
        ++server;
        id->server = server;
        if(strlen(str) > 0)
            id->user = str;
    }

    return jid_safe(id);
}

void jid_set(jid id, char *str, int item)
{
    char *old;

    if(id == NULL)
        return;

    /* invalidate the cached copy */
    id->full = NULL;

    switch(item)
    {
    case JID_RESOURCE:
        if(str != NULL && strlen(str) != 0)
            id->resource = pstrdup(id->p, str);
        else
            id->resource = NULL;
        break;
    case JID_USER:
        old = id->user;
        if(str != NULL && strlen(str) != 0)
            id->user = pstrdup(id->p, str);
        else
            id->user = NULL;
        if(jid_safe(id) == NULL)
            id->user = old; /* revert if invalid */
        break;
    case JID_SERVER:
        old = id->server;
        id->server = pstrdup(id->p, str);
        if(jid_safe(id) == NULL)
            id->server = old; /* revert if invalid */
        break;
    }

}

char *jid_full(jid id)
{
    spool s;

    if(id == NULL)
        return NULL;

    /* use cached copy */
    if(id->full != NULL)
        return id->full;

    s = spool_new(id->p);

    if(id->user != NULL)
        spooler(s, id->user,"@",s);

    spool_add(s, id->server);

    if(id->resource != NULL)
        spooler(s, "/",id->resource,s);

    id->full = spool_print(s);
    return id->full;
}

/* parses a /resource?name=value&foo=bar into an xmlnode representing <resource name="value" foo="bar"/> */
xmlnode jid_xres(jid id)
{
    char *cur, *qmark, *amp, *eq;
    xmlnode x;

    if(id == NULL || id->resource == NULL) return NULL;

    cur = pstrdup(id->p, id->resource);
    qmark = strstr(cur, "?");
    if(qmark == NULL) return NULL;
    *qmark = '\0';
    qmark++;

    x = _xmlnode_new(id->p, cur, NTYPE_TAG);

    cur = qmark;
    while(cur != '\0')
    {
        eq = strstr(cur, "=");
        if(eq == NULL) break;
        *eq = '\0';
        eq++;

        amp = strstr(eq, "&");
        if(amp != NULL)
        {
            *amp = '\0';
            amp++;
        }

        xmlnode_put_attrib(x,cur,eq);

        if(amp != NULL)
            cur = amp;
        else
            break;
    }

    return x;
}

/* local utils */
int _jid_nullstrcmp(char *a, char *b)
{
    if(a == NULL && b == NULL) return 0;
    if(a == NULL || b == NULL) return -1;
    return strcmp(a,b);
}
int _jid_nullstrcasecmp(char *a, char *b)
{
    if(a == NULL && b == NULL) return 0;
    if(a == NULL || b == NULL) return -1;
    return strcasecmp(a,b);
}

int jid_cmp(jid a, jid b)
{
    if(a == NULL || b == NULL)
        return -1;

    if(_jid_nullstrcmp(a->resource, b->resource) != 0) return -1;
    if(_jid_nullstrcasecmp(a->user, b->user) != 0) return -1;
    if(_jid_nullstrcmp(a->server, b->server) != 0) return -1;

    return 0;
}

/* suggested by Anders Qvist <quest@valdez.netg.se> */
int jid_cmpx(jid a, jid b, int parts)
{
    if(a == NULL || b == NULL)
        return -1;

    if(parts & JID_RESOURCE && _jid_nullstrcmp(a->resource, b->resource) != 0) return -1;
    if(parts & JID_USER && _jid_nullstrcasecmp(a->user, b->user) != 0) return -1;
    if(parts & JID_SERVER && _jid_nullstrcmp(a->server, b->server) != 0) return -1;

    return 0;
}

/* makes a copy of b in a's pool, requires a valid a first! */
jid jid_append(jid a, jid b)
{
    jid next;

    if(a == NULL)
        return NULL;

    if(b == NULL)
        return a;

    next = a;
    while(next != NULL)
    {
        /* check for dups */
        if(jid_cmp(next,b) == 0)
            break;
        if(next->next == NULL)
            next->next = jid_new(a->p,jid_full(b));
        next = next->next;
    }
    return a;
}

xmlnode jid_nodescan(jid id, xmlnode x)
{
    xmlnode cur;
    pool p;
    jid tmp;

    if(id == NULL || xmlnode_get_firstchild(x) == NULL) return NULL;

    p = pool_new();
    for(cur = xmlnode_get_firstchild(x); cur != NULL; cur = xmlnode_get_nextsibling(cur))
    {
        if(xmlnode_get_type(cur) != NTYPE_TAG) continue;

        tmp = jid_new(p,xmlnode_get_attrib(cur,"jid"));
        if(tmp == NULL) continue;

        if(jid_cmp(tmp,id) == 0) break;
    }
    pool_free(p);

    return cur;
}

jid jid_user(jid a)
{
    jid ret;

    if(a == NULL || a->resource == NULL) return a;

    ret = pmalloco(a->p,sizeof(struct jid_struct));
    ret->p = a->p;
    ret->user = a->user;
    ret->server = a->server;

    return ret;
}
