1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * An example input filter - this converts input to upper case. Note that
19 * because of the moment it gets inserted it does NOT convert request headers.
23 #include "http_config.h"
24 #include "apr_buckets.h"
25 #include "apr_general.h"
27 #include "util_filter.h"
28 #include "http_request.h"
32 static const char s_szCaseFilterName[] = "CaseFilterIn";
33 module AP_MODULE_DECLARE_DATA case_filter_in_module;
42 apr_bucket_brigade *pbbTmp;
43 } CaseFilterInContext;
45 static void *CaseFilterInCreateServerConfig(apr_pool_t *p, server_rec *s)
47 CaseFilterInConfig *pConfig = apr_pcalloc(p, sizeof *pConfig);
49 pConfig->bEnabled = 0;
54 static void CaseFilterInInsertFilter(request_rec *r)
56 CaseFilterInConfig *pConfig=ap_get_module_config(r->server->module_config,
57 &case_filter_in_module);
58 if(!pConfig->bEnabled)
61 ap_add_input_filter(s_szCaseFilterName,NULL,r,r->connection);
64 static apr_status_t CaseFilterInFilter(ap_filter_t *f,
65 apr_bucket_brigade *pbbOut,
66 ap_input_mode_t eMode,
67 apr_read_type_e eBlock,
70 request_rec *r = f->r;
71 conn_rec *c = r->connection;
72 CaseFilterInContext *pCtx;
75 if (!(pCtx = f->ctx)) {
76 f->ctx = pCtx = apr_palloc(r->pool, sizeof *pCtx);
77 pCtx->pbbTmp = apr_brigade_create(r->pool, c->bucket_alloc);
80 if (APR_BRIGADE_EMPTY(pCtx->pbbTmp)) {
81 ret = ap_get_brigade(f->next, pCtx->pbbTmp, eMode, eBlock, nBytes);
83 if (eMode == AP_MODE_EATCRLF || ret != APR_SUCCESS)
87 while(!APR_BRIGADE_EMPTY(pCtx->pbbTmp)) {
88 apr_bucket *pbktIn = APR_BRIGADE_FIRST(pCtx->pbbTmp);
95 /* It is tempting to do this...
96 * APR_BUCKET_REMOVE(pB);
97 * APR_BRIGADE_INSERT_TAIL(pbbOut,pB);
98 * and change the case of the bucket data, but that would be wrong
99 * for a file or socket buffer, for example...
102 if(APR_BUCKET_IS_EOS(pbktIn)) {
103 APR_BUCKET_REMOVE(pbktIn);
104 APR_BRIGADE_INSERT_TAIL(pbbOut, pbktIn);
108 ret=apr_bucket_read(pbktIn, &data, &len, eBlock);
109 if(ret != APR_SUCCESS)
113 for(n=0 ; n < len ; ++n)
114 buf[n] = apr_toupper(data[n]);
116 pbktOut = apr_bucket_heap_create(buf, len, 0, c->bucket_alloc);
117 APR_BRIGADE_INSERT_TAIL(pbbOut, pbktOut);
118 apr_bucket_delete(pbktIn);
125 static const char *CaseFilterInEnable(cmd_parms *cmd, void *dummy, int arg)
127 CaseFilterInConfig *pConfig
128 = ap_get_module_config(cmd->server->module_config,
129 &case_filter_in_module);
130 pConfig->bEnabled=arg;
135 static const command_rec CaseFilterInCmds[] =
137 AP_INIT_FLAG("CaseFilterIn", CaseFilterInEnable, NULL, RSRC_CONF,
138 "Run an input case filter on this host"),
143 static void CaseFilterInRegisterHooks(apr_pool_t *p)
145 ap_hook_insert_filter(CaseFilterInInsertFilter, NULL, NULL,
147 ap_register_input_filter(s_szCaseFilterName, CaseFilterInFilter, NULL,
151 module AP_MODULE_DECLARE_DATA case_filter_in_module =
153 STANDARD20_MODULE_STUFF,
156 CaseFilterInCreateServerConfig,
159 CaseFilterInRegisterHooks