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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/

#include "common-internal.h"
#include "rule_extensions.h"
#include "plugin_loader.h"
#include "connection-protected.h"
#include "server-protected.h"
#include "thread.h"
#include "util.h"

#define ENTRIES "rule,extensions"
#define MAGIC 0xFABADA

PLUGIN_INFO_RULE_EASIEST_INIT(extensions);


static ret_t
parse_value (cherokee_buffer_t *value, cherokee_avl_t *extensions)
{
char *val;
char *tmpp;
cherokee_buffer_t tmp = CHEROKEE_BUF_INIT;

TRACE(ENTRIES, "Adding extensions: '%s'\n", value->buf);
cherokee_buffer_add_buffer (&tmp, value);

tmpp = tmp.buf;
while ((val = strsep(&tmpp, ",")) != NULL) {
TRACE(ENTRIES, "Adding extension: '%s'\n", val);
cherokee_avl_add_ptr (extensions, val, (void *)MAGIC);
}

cherokee_buffer_mrproper (&tmp);
return ret_ok;
}

static ret_t
configure (cherokee_rule_extensions_t *rule,
cherokee_config_node_t *conf,
cherokee_virtual_server_t *vsrv)
{
ret_t ret;
cherokee_buffer_t *tmp = NULL;

UNUSED(vsrv);

ret = cherokee_config_node_read (conf, "extensions", &tmp);
if (ret != ret_ok) {
LOG_CRITICAL (CHEROKEE_ERROR_RULE_NO_PROPERTY,
RULE(rule)->priority, "extensions");
return ret_error;
}

cherokee_config_node_read_bool (conf, "check_local_file", &rule->check_local_file);
cherokee_config_node_read_bool (conf, "iocache", &rule->use_iocache);

return parse_value (tmp, &rule->extensions);
}

static ret_t
_free (void *p)
{
cherokee_rule_extensions_t *rule = RULE_EXTENSIONS(p);

cherokee_avl_mrproper (&rule->extensions, NULL);
return ret_ok;
}

static ret_t
local_file_exists (cherokee_rule_extensions_t *rule,
cherokee_connection_t *conn,
cherokee_config_entry_t *ret_conf)
{
ret_t ret;
struct stat *info;
struct stat nocache_info;
cherokee_boolean_t is_file;
cherokee_iocache_entry_t *io_entry = NULL;
cherokee_server_t *srv = CONN_SRV(conn);
cherokee_buffer_t *tmp = THREAD_TMP_BUF1(CONN_THREAD(conn));

UNUSED(rule);

/* Build the full path
*/
cherokee_buffer_clean (tmp);

if (ret_conf->document_root != NULL) {
/* A previous non-final rule set a custom document root */
cherokee_buffer_add_buffer (tmp, ret_conf->document_root);
} else {
cherokee_buffer_add_buffer (tmp, &conn->local_directory);
}

cherokee_buffer_add_str (tmp, "/");

if (! cherokee_buffer_is_empty (&conn->web_directory)) {
cherokee_buffer_add (tmp,
conn->request.buf + conn->web_directory.len,
conn->request.len - conn->web_directory.len);
} else {
cherokee_buffer_add_buffer (tmp, &conn->request);
}

/* Check the local file
*/
ret = cherokee_io_stat (srv->iocache, tmp, rule->use_iocache,
&nocache_info, &io_entry, &info);

if (ret == ret_ok) {
is_file = S_ISREG(info->st_mode);
}

if (io_entry) {
cherokee_iocache_entry_unref (&io_entry);
}

/* Report and return
*/
if (ret != ret_ok) {
TRACE(ENTRIES, "Rule extensions: almost matched '%s', but file does not exist\n", tmp->buf);
return ret_not_found;
}

if (! is_file) {
TRACE(ENTRIES, "Rule extensions: almost matched '%s', but it is not a file\n", tmp->buf);
return ret_not_found;
}

return ret_ok;
}

static ret_t
match (cherokee_rule_extensions_t *rule,
       cherokee_connection_t *conn,
       cherokee_config_entry_t *ret_conf)
{
ret_t ret;
char *dot;
char *slash;
char *end;
char *p;
void *foo;
char *dot_prev = NULL;

UNUSED(ret_conf);

end = conn->request.buf + conn->request.len;
p = end - 1;

/* For each '.' */
while (p > conn->request.buf) {
if (*p != '.') {
p--;
continue;
}

if (p[1] == '\0') {
p--;
continue;
}

if (p[1] == '/') {
p--;
continue;
}

dot = p;
slash = NULL;

/* Find a slash after the dot */
while (p < end) {
if (*p == '/') {
slash = p;
*p = '\0';
break;
}

p++;

if ((dot_prev != NULL) && (p >= dot_prev)) {
break;
}
}

/* Check it out */
ret = cherokee_avl_get_ptr (&rule->extensions, dot+1, &foo);
switch (ret) {
case ret_ok:
if (rule->check_local_file) {
ret = local_file_exists (rule, conn, ret_conf);
if (ret != ret_ok) {
break;
}
}

TRACE(ENTRIES, "Match extension: '%s'\n", dot+1);
  if (slash != NULL) {
*slash = '/';
}
return ret_ok;
case ret_not_found:
TRACE(ENTRIES, "Rule extension: did not match '%s'\n", dot+1);
break;
default:
conn->error_code = http_internal_error;
return ret_error;
}

/* Revert pathinfo match char
*/
if (slash != NULL) {
*slash = '/';
}

dot_prev = dot;
p = dot - 1;
}

TRACE(ENTRIES, "Rule extension: nothing more to test '%s'\n", conn->request.buf);
return ret_not_found;
}


ret_t
cherokee_rule_extensions_new (cherokee_rule_extensions_t **rule)
{
CHEROKEE_NEW_STRUCT (n, rule_extensions);

/* Parent class constructor
*/
cherokee_rule_init_base (RULE(n), PLUGIN_INFO_PTR(extensions));

/* Virtual methods
*/
RULE(n)->match = (rule_func_match_t) match;
RULE(n)->configure = (rule_func_configure_t) configure;
MODULE(n)->free = (module_func_free_t) _free;

/* Properties
*/
n->check_local_file = false;
n->use_iocache = true;

cherokee_avl_init (&n->extensions);

*rule = n;
  return ret_ok;
}
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