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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "httpd.h"
#include "http_config.h"
#include "apr_buckets.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "util_filter.h"
#include "http_request.h"
#include <ctype.h>
static const char s_szCaseFilterName[] = "CaseFilter";
module AP_MODULE_DECLARE_DATA case_filter_module;
typedef struct
{
int bEnabled;
} CaseFilterConfig;
static void *CaseFilterCreateServerConfig(apr_pool_t *p, server_rec *s)
{
CaseFilterConfig *pConfig = apr_pcalloc(p,sizeof *pConfig);
pConfig->bEnabled = 0;
return pConfig;
}
static void CaseFilterInsertFilter(request_rec *r)
{
CaseFilterConfig *pConfig = ap_get_module_config(r->server->module_config,
&case_filter_module);
if (!pConfig->bEnabled)
return;
ap_add_output_filter(s_szCaseFilterName, NULL, r, r->connection);
}
static apr_status_t CaseFilterOutFilter(ap_filter_t *f,
apr_bucket_brigade *pbbIn)
{
request_rec *r = f->r;
conn_rec *c = r->connection;
apr_bucket *pbktIn;
apr_bucket_brigade *pbbOut;
pbbOut = apr_brigade_create(r->pool, c->bucket_alloc);
for (pbktIn = APR_BRIGADE_FIRST(pbbIn);
pbktIn != APR_BRIGADE_SENTINEL(pbbIn);
pbktIn = APR_BUCKET_NEXT(pbktIn))
{
const char *data;
apr_size_t len;
char *buf;
apr_size_t n;
apr_bucket *pbktOut;
if (APR_BUCKET_IS_EOS(pbktIn)) {
apr_bucket *pbktEOS = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(pbbOut, pbktEOS);
continue;
}
/* read */
apr_bucket_read(pbktIn, &data, &len, APR_BLOCK_READ);
/* write */
buf = apr_bucket_alloc(len, c->bucket_alloc);
for (n=0 ; n < len ; ++n) {
buf[n] = apr_toupper(data[n]);
}
pbktOut = apr_bucket_heap_create(buf, len, apr_bucket_free,
c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(pbbOut, pbktOut);
}
/* Q: is there any advantage to passing a brigade for each bucket?
* A: obviously, it can cut down server resource consumption, if this
* experimental module was fed a file of 4MB, it would be using 8MB for
* the 'read' buckets and the 'write' buckets.
*
* Note it is more efficient to consume (destroy) each bucket as it's
* processed above than to do a single cleanup down here. In any case,
* don't let our caller pass the same buckets to us, twice;
*/
apr_brigade_cleanup(pbbIn);
return ap_pass_brigade(f->next, pbbOut);
}
static const char *CaseFilterEnable(cmd_parms *cmd, void *dummy, int arg)
{
CaseFilterConfig *pConfig = ap_get_module_config(cmd->server->module_config,
&case_filter_module);
pConfig->bEnabled = arg;
return NULL;
}
static const command_rec CaseFilterCmds[] =
{
AP_INIT_FLAG("CaseFilter", CaseFilterEnable, NULL, RSRC_CONF,
"Run a case filter on this host"),
{ NULL }
};
static void CaseFilterRegisterHooks(apr_pool_t *p)
{
ap_hook_insert_filter(CaseFilterInsertFilter, NULL, NULL, APR_HOOK_MIDDLE);
ap_register_output_filter(s_szCaseFilterName, CaseFilterOutFilter, NULL,
AP_FTYPE_RESOURCE);
}
AP_DECLARE_MODULE(case_filter) =
{
STANDARD20_MODULE_STUFF,
NULL,
NULL,
CaseFilterCreateServerConfig,
NULL,
CaseFilterCmds,
CaseFilterRegisterHooks
};