granicus.if.org Git - apache/blob - modules/experimental/mod_case_filter.c

   1 /* Copyright 2001-2006 The Apache Software Foundation or its licensors, as
   2  * applicable.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 #include "httpd.h"
  18 #include "http_config.h"
  19 #include "apr_buckets.h"
  20 #include "apr_general.h"
  21 #include "apr_lib.h"
  22 #include "util_filter.h"
  23 #include "http_request.h"
  24
  25 #include <ctype.h>
  26
  27 static const char s_szCaseFilterName[]="CaseFilter";
  28 module AP_MODULE_DECLARE_DATA case_filter_module;
  29
  30 typedef struct
  31     {
  32     int bEnabled;
  33     } CaseFilterConfig;
  34
  35 static void *CaseFilterCreateServerConfig(apr_pool_t *p,server_rec *s)
  36     {
  37     CaseFilterConfig *pConfig=apr_pcalloc(p,sizeof *pConfig);
  38
  39     pConfig->bEnabled=0;
  40
  41     return pConfig;
  42     }
  43
  44 static void CaseFilterInsertFilter(request_rec *r)
  45     {
  46     CaseFilterConfig *pConfig=ap_get_module_config(r->server->module_config,
  47                                                    &case_filter_module);
  48
  49     if(!pConfig->bEnabled)
  50         return;
  51
  52     ap_add_output_filter(s_szCaseFilterName,NULL,r,r->connection);
  53     }
  54
  55 static apr_status_t CaseFilterOutFilter(ap_filter_t *f,
  56                                         apr_bucket_brigade *pbbIn)
  57     {
  58     request_rec *r = f->r;
  59     conn_rec *c = r->connection;
  60     apr_bucket *pbktIn;
  61     apr_bucket_brigade *pbbOut;
  62
  63     pbbOut=apr_brigade_create(r->pool, c->bucket_alloc);
  64     for (pbktIn = APR_BRIGADE_FIRST(pbbIn);
  65          pbktIn != APR_BRIGADE_SENTINEL(pbbIn);
  66          pbktIn = APR_BUCKET_NEXT(pbktIn))
  67     {
  68         const char *data;
  69         apr_size_t len;
  70         char *buf;
  71         apr_size_t n;
  72         apr_bucket *pbktOut;
  73
  74         if(APR_BUCKET_IS_EOS(pbktIn))
  75             {
  76             apr_bucket *pbktEOS=apr_bucket_eos_create(c->bucket_alloc);
  77             APR_BRIGADE_INSERT_TAIL(pbbOut,pbktEOS);
  78             continue;
  79             }
  80
  81         /* read */
  82         apr_bucket_read(pbktIn,&data,&len,APR_BLOCK_READ);
  83
  84         /* write */
  85         buf = apr_bucket_alloc(len, c->bucket_alloc);
  86         for(n=0 ; n < len ; ++n)
  87             buf[n] = apr_toupper(data[n]);
  88
  89         pbktOut = apr_bucket_heap_create(buf, len, apr_bucket_free,
  90                                          c->bucket_alloc);
  91         APR_BRIGADE_INSERT_TAIL(pbbOut,pbktOut);
  92         }
  93
  94     /* XXX: is there any advantage to passing a brigade for each bucket? */
  95     return ap_pass_brigade(f->next,pbbOut);
  96     }
  97
  98 static const char *CaseFilterEnable(cmd_parms *cmd, void *dummy, int arg)
  99     {
 100     CaseFilterConfig *pConfig=ap_get_module_config(cmd->server->module_config,
 101                                                    &case_filter_module);
 102     pConfig->bEnabled=arg;
 103
 104     return NULL;
 105     }
 106
 107 static const command_rec CaseFilterCmds[] =
 108     {
 109     AP_INIT_FLAG("CaseFilter", CaseFilterEnable, NULL, RSRC_CONF,
 110                  "Run a case filter on this host"),
 111     { NULL }
 112     };
 113
 114 static void CaseFilterRegisterHooks(apr_pool_t *p)
 115     {
 116     ap_hook_insert_filter(CaseFilterInsertFilter,NULL,NULL,APR_HOOK_MIDDLE);
 117     ap_register_output_filter(s_szCaseFilterName,CaseFilterOutFilter,NULL,
 118                               AP_FTYPE_RESOURCE);
 119     }
 120
 121 module AP_MODULE_DECLARE_DATA case_filter_module =
 122 {
 123     STANDARD20_MODULE_STUFF,
 124     NULL,
 125     NULL,
 126     CaseFilterCreateServerConfig,
 127     NULL,
 128     CaseFilterCmds,
 129     CaseFilterRegisterHooks
 130 };