git.m6w6.name Git - m6w6/ext-http/blob - http_cache_api.c

   1 /*
   2    +----------------------------------------------------------------------+
   3    | PECL :: http                                                         |
   4    +----------------------------------------------------------------------+
   5    | This source file is subject to version 3.0 of the PHP license, that  |
   6    | is bundled with this package in the file LICENSE, and is available   |
   7    | through the world-wide-web at http://www.php.net/license/3_0.txt.    |
   8    | If you did not receive a copy of the PHP license and are unable to   |
   9    | obtain it through the world-wide-web, please send a note to          |
  10    | license@php.net so we can mail you a copy immediately.               |
  11    +----------------------------------------------------------------------+
  12    | Copyright (c) 2004-2005 Michael Wallner <mike@php.net>               |
  13    +----------------------------------------------------------------------+
  14 */
  15
  16 /* $Id$ */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #       include "config.h"
  20 #endif
  21 #include "php.h"
  22
  23 #include "SAPI.h"
  24 #include "php_streams.h"
  25 #include "php_output.h"
  26 #include "ext/standard/md5.h"
  27
  28 #include "php_http.h"
  29 #include "php_http_std_defs.h"
  30 #include "php_http_api.h"
  31 #include "php_http_cache_api.h"
  32 #include "php_http_send_api.h"
  33 #include "php_http_date_api.h"
  34
  35 ZEND_EXTERN_MODULE_GLOBALS(http);
  36
  37 /* {{{ char *http_etag(void *, size_t, http_send_mode) */
  38 PHP_HTTP_API char *_http_etag(const void *data_ptr, size_t data_len, http_send_mode data_mode TSRMLS_DC)
  39 {
  40         php_stream_statbuf ssb;
  41         char ssb_buf[128] = {0};
  42         unsigned char digest[16];
  43         PHP_MD5_CTX ctx;
  44         char *new_etag = ecalloc(1, 33);
  45
  46         PHP_MD5Init(&ctx);
  47
  48         switch (data_mode)
  49         {
  50                 case SEND_DATA:
  51                         PHP_MD5Update(&ctx, data_ptr, data_len);
  52                 break;
  53
  54                 case SEND_RSRC:
  55                 {
  56                         if (php_stream_stat((php_stream *) data_ptr, &ssb)) {
  57                                 efree(new_etag);
  58                                 return NULL;
  59                         }
  60
  61                         snprintf(ssb_buf, 127, "%ld=%ld=%ld", ssb.sb.st_mtime, ssb.sb.st_ino, ssb.sb.st_size);
  62                         PHP_MD5Update(&ctx, ssb_buf, strlen(ssb_buf));
  63                 }
  64                 break;
  65
  66                 default:
  67                 {
  68                         if (php_stream_stat_path((char *) data_ptr, &ssb)) {
  69                                 efree(new_etag);
  70                                 return NULL;
  71                         }
  72
  73                         snprintf(ssb_buf, 127, "%ld=%ld=%ld", ssb.sb.st_mtime, ssb.sb.st_ino, ssb.sb.st_size);
  74                         PHP_MD5Update(&ctx, ssb_buf, strlen(ssb_buf));
  75                 }
  76                 break;
  77         }
  78
  79         PHP_MD5Final(digest, &ctx);
  80         make_digest(new_etag, digest);
  81
  82         return new_etag;
  83 }
  84 /* }}} */
  85
  86 /* {{{ time_t http_last_modified(void *, http_send_mode) */
  87 PHP_HTTP_API time_t _http_last_modified(const void *data_ptr, http_send_mode data_mode TSRMLS_DC)
  88 {
  89         php_stream_statbuf ssb;
  90
  91         switch (data_mode)
  92         {
  93                 case SEND_DATA: return time(NULL);
  94                 case SEND_RSRC: return php_stream_stat((php_stream *) data_ptr, &ssb) ? 0 : ssb.sb.st_mtime;
  95                 default:                return php_stream_stat_path((char *) data_ptr, &ssb) ? 0 : ssb.sb.st_mtime;
  96         }
  97 }
  98 /* }}} */
  99
 100 /* {{{ zend_bool http_match_last_modified(char *, time_t) */
 101 PHP_HTTP_API zend_bool _http_match_last_modified_ex(const char *entry, time_t t, zend_bool enforce_presence TSRMLS_DC)
 102 {
 103         zend_bool retval;
 104         zval *zmodified;
 105         char *modified, *chr_ptr;
 106
 107         HTTP_GSC(zmodified, entry, !enforce_presence);
 108
 109         modified = estrndup(Z_STRVAL_P(zmodified), Z_STRLEN_P(zmodified));
 110         if (chr_ptr = strrchr(modified, ';')) {
 111                 chr_ptr = 0;
 112         }
 113         retval = (t <= http_parse_date(modified));
 114         efree(modified);
 115         return retval;
 116 }
 117 /* }}} */
 118
 119 /* {{{ zend_bool http_match_etag(char *, char *) */
 120 PHP_HTTP_API zend_bool _http_match_etag_ex(const char *entry, const char *etag, zend_bool enforce_presence TSRMLS_DC)
 121 {
 122         zval *zetag;
 123         char *quoted_etag;
 124         zend_bool result;
 125
 126         HTTP_GSC(zetag, entry, !enforce_presence);
 127
 128         if (NULL != strchr(Z_STRVAL_P(zetag), '*')) {
 129                 return 1;
 130         }
 131
 132         quoted_etag = (char *) emalloc(strlen(etag) + 3);
 133         sprintf(quoted_etag, "\"%s\"", etag);
 134
 135         if (!strchr(Z_STRVAL_P(zetag), ',')) {
 136                 result = !strcmp(Z_STRVAL_P(zetag), quoted_etag);
 137         } else {
 138                 result = (NULL != strstr(Z_STRVAL_P(zetag), quoted_etag));
 139         }
 140         efree(quoted_etag);
 141         return result;
 142 }
 143 /* }}} */
 144
 145 /* {{{ STATUS http_cache_last_modified(time_t, time_t, char *, size_t) */
 146 PHP_HTTP_API STATUS _http_cache_last_modified(time_t last_modified,
 147         time_t send_modified, const char *cache_control, size_t cc_len TSRMLS_DC)
 148 {
 149         char *sent_header = NULL;
 150
 151         if (cc_len && (SUCCESS != http_send_cache_control(cache_control, cc_len))) {
 152                 return FAILURE;
 153         }
 154
 155         if (SUCCESS != http_send_last_modified_ex(send_modified, &sent_header)) {
 156                 return FAILURE;
 157         }
 158
 159         if (http_match_last_modified("HTTP_IF_MODIFIED_SINCE", last_modified)) {
 160                 http_exit_ex(304, sent_header, NULL, 0);
 161         } else {
 162                 STR_FREE(sent_header);
 163         }
 164
 165         return SUCCESS;
 166 }
 167 /* }}} */
 168
 169 /* {{{ STATUS http_cache_etag(char *, size_t, char *, size_t) */
 170 PHP_HTTP_API STATUS _http_cache_etag(const char *etag, size_t etag_len,
 171         const char *cache_control, size_t cc_len TSRMLS_DC)
 172 {
 173         char *sent_header = NULL;
 174
 175         if (cc_len && (SUCCESS != http_send_cache_control(cache_control, cc_len))) {
 176                 return FAILURE;
 177         }
 178
 179         if (etag_len) {
 180                 if (SUCCESS != http_send_etag_ex(etag, etag_len, &sent_header)) {
 181                         return FAILURE;
 182                 }
 183                 if (http_match_etag("HTTP_IF_NONE_MATCH", etag)) {
 184                         http_exit_ex(304, sent_header, NULL, 0);
 185                 } else {
 186                         STR_FREE(sent_header);
 187                 }
 188                 return SUCCESS;
 189         }
 190
 191         /* if no etag is given and we didn't already start ob_etaghandler -- start it */
 192         if (HTTP_G(etag).started) {
 193                 return SUCCESS;
 194         }
 195
 196         if (HTTP_G(etag).started = (SUCCESS == php_start_ob_buffer_named("ob_etaghandler", HTTP_SENDBUF_SIZE, 1 TSRMLS_CC))) {
 197                 return SUCCESS;
 198         } else {
 199                 return FAILURE;
 200         }
 201 }
 202 /* }}} */
 203
 204 /* {{{ void http_ob_etaghandler(char *, uint, char **, uint *, int) */
 205 PHP_HTTP_API void _http_ob_etaghandler(char *output, uint output_len,
 206         char **handled_output, uint *handled_output_len, int mode TSRMLS_DC)
 207 {
 208         char etag[33] = { 0 };
 209         unsigned char digest[16];
 210
 211         if (mode & PHP_OUTPUT_HANDLER_START) {
 212                 HTTP_G(etag).started = 1;
 213                 PHP_MD5Init(&HTTP_G(etag).md5ctx);
 214         }
 215
 216         PHP_MD5Update(&HTTP_G(etag).md5ctx, output, output_len);
 217
 218         if (mode & PHP_OUTPUT_HANDLER_END) {
 219                 PHP_MD5Final(digest, &HTTP_G(etag).md5ctx);
 220
 221                 /* just do that if desired */
 222                 if (HTTP_G(etag).started) {
 223                         char *sent_header = NULL;
 224
 225                         make_digest(etag, digest);
 226                         http_send_cache_control(HTTP_DEFAULT_CACHECONTROL, lenof(HTTP_DEFAULT_CACHECONTROL));
 227                         http_send_etag_ex(etag, 32, &sent_header);
 228
 229                         if (http_match_etag("HTTP_IF_NONE_MATCH", etag)) {
 230                                 http_exit_ex(304, sent_header, NULL, 0);
 231                         } else {
 232                                 STR_FREE(sent_header);
 233                         }
 234                 }
 235         }
 236
 237         *handled_output_len = output_len;
 238         *handled_output = estrndup(output, output_len);
 239 }
 240 /* }}} */
 241
 242 /*
 243  * Local variables:
 244  * tab-width: 4
 245  * c-basic-offset: 4
 246  * End:
 247  * vim600: sw=4 ts=4 fdm=marker
 248  * vim<600: sw=4 ts=4
 249  */
 250