git.m6w6.name Git - m6w6/ext-http/blob - src/php_http_negotiate.c

   1 /*
   2     +--------------------------------------------------------------------+
   3     | PECL :: http                                                       |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted provided that the conditions mentioned |
   7     | in the accompanying LICENSE file are met.                          |
   8     +--------------------------------------------------------------------+
   9     | Copyright (c) 2004-2014, Michael Wallner <mike@php.net>            |
  10     +--------------------------------------------------------------------+
  11 */
  12
  13 #include "php_http_api.h"
  14
  15 #ifndef PHP_HTTP_DEBUG_NEG
  16 # define PHP_HTTP_DEBUG_NEG 0
  17 #endif
  18
  19 static int php_http_negotiate_sort(Bucket *b1, Bucket *b2)
  20 {
  21         int result = numeric_compare_function(&b1->val, &b2->val);
  22
  23         return (result > 0 ? -1 : (result < 0 ? 1 : 0));
  24 }
  25
  26 #define M_PRI 5
  27 #define M_SEC 2
  28 #define M_ANY -1
  29 #define M_NOT 0
  30 #define M_ALL ~0
  31 static inline unsigned php_http_negotiate_match(const char *param_str, size_t param_len, const char *supported_str, size_t supported_len, const char *sep_str, size_t sep_len)
  32 {
  33         unsigned match = M_NOT;
  34
  35         if (param_len == supported_len && !strncasecmp(param_str, supported_str, param_len)) {
  36                 /* that was easy */
  37                 match = M_ALL;
  38         } else if (sep_str && sep_len) {
  39                 const char *param_sec = php_http_locate_str(param_str, param_len, sep_str, sep_len);
  40                 size_t param_pri_len = param_sec ? param_sec - param_str : param_len;
  41                 const char *supported_sec = php_http_locate_str(supported_str, supported_len, sep_str, sep_len);
  42                 size_t supported_pri_len = supported_sec ? supported_sec - supported_str : supported_len;
  43                 size_t cmp_len = MIN(param_pri_len, supported_pri_len);
  44
  45                 if (((*param_str == '*') || (*supported_str == '*'))
  46                 ||      ((param_pri_len == supported_pri_len) && !strncasecmp(param_str, supported_str, param_pri_len))
  47                 ||      ((!param_sec || !supported_sec) && cmp_len && !strncasecmp(param_str, supported_str, cmp_len))
  48                 ) {
  49                         match += M_PRI;
  50                 }
  51
  52                 if (param_sec && supported_sec
  53                 && ((*(param_sec + sep_len) == '*' || *(supported_sec + sep_len) == '*')
  54                         || !strcasecmp(param_sec, supported_sec)
  55                         )
  56                 ) {
  57                         match += M_SEC;
  58                 }
  59
  60                 if ((param_sec && *(param_sec + sep_len) == '*')
  61                 ||      (supported_sec && *(supported_sec + sep_len) == '*')
  62                 ||      ((*param_str == '*') || (*supported_str == '*'))
  63                 ) {
  64                         match += M_ANY;
  65                 }
  66         }
  67 #if PHP_HTTP_DEBUG_NEG
  68         fprintf(stderr, "match: %s == %s => %u\n", supported_str, param_str, match);
  69 #endif
  70         return match;
  71 }
  72 static int php_http_negotiate_reduce(zval *p, int num_args, va_list args, zend_hash_key *hash_key)
  73 {
  74         unsigned best_match = 0;
  75         double q = 0;
  76         php_http_arrkey_t key;
  77         zval *value;
  78         zend_string *supported = zval_get_string(p);
  79         HashTable *params = va_arg(args, HashTable *);
  80         HashTable *result = va_arg(args, HashTable *);
  81         const char *sep_str = va_arg(args, const char *);
  82         size_t sep_len = va_arg(args, size_t);
  83
  84         ZEND_HASH_FOREACH_KEY_VAL(params, key.h, key.key, value)
  85         {
  86                 unsigned match;
  87
  88 #if PHP_HTTP_DEBUG_NEG
  89                         fprintf(stderr, "match(%u) > best_match(%u) = %u (q=%f)\n", match, best_match, match>best_match, Z_DVAL_PP(val));
  90 #endif
  91                 php_http_arrkey_stringify(&key, NULL);
  92                 match = php_http_negotiate_match(key.key->val, key.key->len, supported->val, supported->len, sep_str, sep_len);
  93
  94                 if (match > best_match) {
  95                         best_match = match;
  96                         q = Z_DVAL_P(value) - 0.1 / match;
  97                 }
  98                 php_http_arrkey_dtor(&key);
  99         }
 100         ZEND_HASH_FOREACH_END();
 101
 102         if (q > 0) {
 103                 zval tmp;
 104
 105                 ZVAL_DOUBLE(&tmp, q);
 106                 zend_hash_update(result, supported, &tmp);
 107         }
 108
 109         zend_string_release(supported);
 110         return ZEND_HASH_APPLY_KEEP;
 111 }
 112
 113 HashTable *php_http_negotiate(const char *value_str, size_t value_len, HashTable *supported, const char *primary_sep_str, size_t primary_sep_len)
 114 {
 115         HashTable *result = NULL;
 116
 117         if (value_str && value_len) {
 118                 unsigned i = 0;
 119                 zval arr, *val, *arg, *zq;
 120                 HashTable params;
 121                 php_http_arrkey_t key;
 122                 php_http_params_opts_t opts;
 123
 124                 zend_hash_init(&params, 10, NULL, ZVAL_PTR_DTOR, 0);
 125                 php_http_params_opts_default_get(&opts);
 126                 opts.input.str = estrndup(value_str, value_len);
 127                 opts.input.len = value_len;
 128                 opts.flags &= ~PHP_HTTP_PARAMS_RFC5987;
 129                 php_http_params_parse(&params, &opts);
 130                 efree(opts.input.str);
 131
 132                 array_init(&arr);
 133
 134                 ZEND_HASH_FOREACH_KEY_VAL(&params, key.h, key.key, val)
 135                 {
 136                         double q;
 137
 138                         if ((arg = zend_hash_str_find(Z_ARRVAL_P(val), ZEND_STRL("arguments")))
 139                         &&      (IS_ARRAY == Z_TYPE_P(arg))
 140                         &&      (zq = zend_hash_str_find(Z_ARRVAL_P(arg), ZEND_STRL("q")))) {
 141                                 q = zval_get_double(zq);
 142                         } else {
 143                                 q = 1.0 - (((double) ++i) / 100.0);
 144                         }
 145
 146 #if 0
 147                         fprintf(stderr, "Q: %s=%1.3f\n", key.key->val, q);
 148 #endif
 149
 150                         if (key.key) {
 151                                 add_assoc_double_ex(&arr, key.key->val, key.key->len, q);
 152                         } else {
 153                                 add_index_double(&arr, key.h, q);
 154                         }
 155
 156                 }
 157                 ZEND_HASH_FOREACH_END();
 158
 159 #if PHP_HTTP_DEBUG_NEG
 160                 zend_print_zval_r(&arr, 1);
 161 #endif
 162
 163                 ALLOC_HASHTABLE(result);
 164                 zend_hash_init(result, zend_hash_num_elements(supported), NULL, ZVAL_PTR_DTOR, 0);
 165                 zend_hash_apply_with_arguments(supported, php_http_negotiate_reduce, 4, Z_ARRVAL(arr), result, primary_sep_str, primary_sep_len);
 166                 zend_hash_destroy(&params);
 167                 zval_dtor(&arr);
 168                 zend_hash_sort(result, php_http_negotiate_sort, 0);
 169         }
 170
 171         return result;
 172 }
 173
 174
 175
 176 /*
 177  * Local variables:
 178  * tab-width: 4
 179  * c-basic-offset: 4
 180  * End:
 181  * vim600: noet sw=4 ts=4 fdm=marker
 182  * vim<600: noet sw=4 ts=4
 183  */
 184
 185