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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.
*/
/*
* An example input filter - this converts input to upper case. Note that
* because of the moment it gets inserted it does NOT convert request headers.
*/
#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[] = "CaseFilterIn";
module AP_MODULE_DECLARE_DATA case_filter_in_module;
typedef struct
{
int bEnabled;
} CaseFilterInConfig;
typedef struct
{
apr_bucket_brigade *pbbTmp;
} CaseFilterInContext;
static void *CaseFilterInCreateServerConfig(apr_pool_t *p, server_rec *s)
{
CaseFilterInConfig *pConfig = apr_pcalloc(p, sizeof *pConfig);
pConfig->bEnabled = 0;
return pConfig;
}
static void CaseFilterInInsertFilter(request_rec *r)
{
CaseFilterInConfig *pConfig = ap_get_module_config(r->server->module_config,
&case_filter_in_module);
if (!pConfig->bEnabled)
return;
ap_add_input_filter(s_szCaseFilterName, NULL, r, r->connection);
}
static apr_status_t CaseFilterInFilter(ap_filter_t *f,
apr_bucket_brigade *pbbOut,
ap_input_mode_t eMode,
apr_read_type_e eBlock,
apr_off_t nBytes)
{
request_rec *r = f->r;
conn_rec *c = r->connection;
CaseFilterInContext *pCtx;
apr_status_t ret;
if (!(pCtx = f->ctx)) {
f->ctx = pCtx = apr_palloc(r->pool, sizeof *pCtx);
pCtx->pbbTmp = apr_brigade_create(r->pool, c->bucket_alloc);
}
if (APR_BRIGADE_EMPTY(pCtx->pbbTmp)) {
ret = ap_get_brigade(f->next, pCtx->pbbTmp, eMode, eBlock, nBytes);
if (eMode == AP_MODE_EATCRLF || ret != APR_SUCCESS)
return ret;
}
while (!APR_BRIGADE_EMPTY(pCtx->pbbTmp)) {
apr_bucket *pbktIn = APR_BRIGADE_FIRST(pCtx->pbbTmp);
apr_bucket *pbktOut;
const char *data;
apr_size_t len;
char *buf;
apr_size_t n;
/* It is tempting to do this...
* APR_BUCKET_REMOVE(pB);
* APR_BRIGADE_INSERT_TAIL(pbbOut,pB);
* and change the case of the bucket data, but that would be wrong
* for a file or socket buffer, for example...
*/
if (APR_BUCKET_IS_EOS(pbktIn)) {
APR_BUCKET_REMOVE(pbktIn);
APR_BRIGADE_INSERT_TAIL(pbbOut, pbktIn);
break;
}
ret=apr_bucket_read(pbktIn, &data, &len, eBlock);
if (ret != APR_SUCCESS)
return ret;
buf = ap_malloc(len);
for (n=0 ; n < len ; ++n) {
buf[n] = apr_toupper(data[n]);
}
pbktOut = apr_bucket_heap_create(buf, len, free, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(pbbOut, pbktOut);
apr_bucket_delete(pbktIn);
}
return APR_SUCCESS;
}
static const char *CaseFilterInEnable(cmd_parms *cmd, void *dummy, int arg)
{
CaseFilterInConfig *pConfig
= ap_get_module_config(cmd->server->module_config,
&case_filter_in_module);
pConfig->bEnabled=arg;
return NULL;
}
static const command_rec CaseFilterInCmds[] =
{
AP_INIT_FLAG("CaseFilterIn", CaseFilterInEnable, NULL, RSRC_CONF,
"Run an input case filter on this host"),
{ NULL }
};
static void CaseFilterInRegisterHooks(apr_pool_t *p)
{
ap_hook_insert_filter(CaseFilterInInsertFilter, NULL, NULL,
APR_HOOK_MIDDLE);
ap_register_input_filter(s_szCaseFilterName, CaseFilterInFilter, NULL,
AP_FTYPE_RESOURCE);
}
AP_DECLARE_MODULE(case_filter_in) =
{
STANDARD20_MODULE_STUFF,
NULL,
NULL,
CaseFilterInCreateServerConfig,
NULL,
CaseFilterInCmds,
CaseFilterInRegisterHooks
};
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