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#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "plugin.h"
/* plugin config for all request/connections */
typedef struct {
array *alias;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
/* init the plugin data */
INIT_FUNC(mod_alias_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
return p;
}
/* detroy the plugin data */
FREE_FUNC(mod_alias_free) {
plugin_data *p = p_d;
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
array_free(s->alias);
free(s);
}
free(p->config_storage);
}
free(p);
return HANDLER_GO_ON;
}
/* handle plugin config and check values */
SETDEFAULTS_FUNC(mod_alias_set_defaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ "alias.url", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
if (!p) return HANDLER_ERROR;
p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->alias = array_init();
cv[0].destination = s->alias;
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
return HANDLER_ERROR;
}
if (s->alias->used >= 2) {
const array *a = s->alias;
size_t j, k;
for (j = 0; j < a->used; j ++) {
const buffer *prefix = a->data[a->sorted[j]]->key;
for (k = j + 1; k < a->used; k ++) {
const buffer *key = a->data[a->sorted[k]]->key;
if (key->used < prefix->used) {
break;
}
if (memcmp(key->ptr, prefix->ptr, prefix->used - 1) != 0) {
break;
}
/* ok, they have same prefix. check position */
if (a->sorted[j] < a->sorted[k]) {
fprintf(stderr, "url.alias: `%s' will never match as `%s' matched first\n",
key->ptr,
prefix->ptr);
return HANDLER_ERROR;
}
}
}
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_alias_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(alias);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("alias.url"))) {
PATCH(alias);
}
}
}
return 0;
}
#undef PATCH
PHYSICALPATH_FUNC(mod_alias_physical_handler) {
plugin_data *p = p_d;
int uri_len, basedir_len;
char *uri_ptr;
size_t k;
if (con->physical.path->used == 0) return HANDLER_GO_ON;
mod_alias_patch_connection(srv, con, p);
/* not to include the tailing slash */
basedir_len = (con->physical.basedir->used - 1) - 1;
uri_len = con->physical.path->used - 1 - basedir_len;
uri_ptr = con->physical.path->ptr + basedir_len;
for (k = 0; k < p->conf.alias->used; k++) {
data_string *ds = (data_string *)p->conf.alias->data[k];
int alias_len = ds->key->used - 1;
if (alias_len > uri_len) continue;
if (ds->key->used == 0) continue;
if (0 == (con->conf.force_lowercase_filenames ?
strncasecmp(uri_ptr, ds->key->ptr, alias_len) :
strncmp(uri_ptr, ds->key->ptr, alias_len))) {
/* matched */
buffer_copy_string_buffer(con->physical.basedir, ds->value);
buffer_copy_string_buffer(srv->tmp_buf, ds->value);
buffer_append_string(srv->tmp_buf, uri_ptr + alias_len);
buffer_copy_string_buffer(con->physical.path, srv->tmp_buf);
return HANDLER_GO_ON;
}
}
/* not found */
return HANDLER_GO_ON;
}
/* this function is called at dlopen() time and inits the callbacks */
int mod_alias_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("alias");
p->init = mod_alias_init;
p->handle_physical= mod_alias_physical_handler;
p->set_defaults = mod_alias_set_defaults;
p->cleanup = mod_alias_free;
p->data = NULL;
return 0;
}
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