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 static int php_http_negotiate_sort(const void *first, const void *second)
  16 {
  17         Bucket *b1 = (Bucket *) first, *b2 = (Bucket *) second;
  18         int result = numeric_compare_function(&b1->val, &b2->val);
  19
  20         return (result > 0 ? -1 : (result < 0 ? 1 : 0));
  21 }
  22
  23 #define M_PRI 5
  24 #define M_SEC 2
  25 #define M_ANY 1
  26 #define M_NOT 0
  27 #define M_ALL ~0
  28 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)
  29 {
  30         unsigned match = M_NOT;
  31
  32         if (param_len == supported_len && !strncasecmp(param_str, supported_str, param_len)) {
  33                 /* that was easy */
  34                 match = M_ALL;
  35         } else if (sep_str && sep_len) {
  36                 const char *param_sec = php_http_locate_str(param_str, param_len, sep_str, sep_len);
  37                 size_t param_pri_len = param_sec ? param_sec - param_str : param_len;
  38                 const char *supported_sec = php_http_locate_str(supported_str, supported_len, sep_str, sep_len);
  39                 size_t supported_pri_len = supported_sec ? supported_sec - supported_str : supported_len;
  40                 size_t cmp_len = MIN(param_pri_len, supported_pri_len);
  41
  42                 if (((*param_str == '*') || (*supported_str == '*'))
  43                 ||      ((param_pri_len == supported_pri_len) && !strncasecmp(param_str, supported_str, param_pri_len))
  44                 ||      ((!param_sec || !supported_sec) && cmp_len && !strncasecmp(param_str, supported_str, cmp_len))
  45                 ) {
  46                         match += M_PRI;
  47                 }
  48
  49                 if (param_sec && supported_sec && !strcasecmp(param_sec, supported_sec)) {
  50                         match += M_SEC;
  51                 }
  52
  53                 if ((param_sec && *(param_sec + sep_len) == '*')
  54                 ||      (supported_sec && *(supported_sec + sep_len) == '*')
  55                 ||      ((*param_str == '*') || (*supported_str == '*'))
  56                 ) {
  57                         match += M_ANY;
  58                 }
  59         }
  60 #if 0
  61         fprintf(stderr, "match: %s == %s => %u\n", supported_str, param_str, match);
  62 #endif
  63         return match;
  64 }
  65 static int php_http_negotiate_reduce(zval *p, int num_args, va_list args, zend_hash_key *hash_key)
  66 {
  67         unsigned best_match = 0;
  68         php_http_arrkey_t key;
  69         zval *value, *q = NULL;
  70         zend_string *supported = zval_get_string(p);
  71         HashTable *params = va_arg(args, HashTable *);
  72         HashTable *result = va_arg(args, HashTable *);
  73         const char *sep_str = va_arg(args, const char *);
  74         size_t sep_len = va_arg(args, size_t);
  75
  76         ZEND_HASH_FOREACH_KEY_VAL(params, key.h, key.key, value)
  77         {
  78                 unsigned match;
  79
  80                 php_http_arrkey_stringify(&key, NULL);
  81                 match = php_http_negotiate_match(key.key->val, key.key->len, supported->val, supported->len, sep_str, sep_len);
  82
  83                 if (match > best_match) {
  84                         best_match = match;
  85                         q = value;
  86                 }
  87                 php_http_arrkey_dtor(&key);
  88         }
  89         ZEND_HASH_FOREACH_END();
  90
  91         if (q && Z_DVAL_P(q) > 0) {
  92                 Z_TRY_ADDREF_P(q);
  93                 zend_hash_update(result, supported, q);
  94         }
  95
  96         zend_string_release(supported);
  97         return ZEND_HASH_APPLY_KEEP;
  98 }
  99
 100 HashTable *php_http_negotiate(const char *value_str, size_t value_len, HashTable *supported, const char *primary_sep_str, size_t primary_sep_len)
 101 {
 102         HashTable *result = NULL;
 103
 104         if (value_str && value_len) {
 105                 unsigned i = 0;
 106                 zval arr, *val, *arg, *zq;
 107                 HashTable params;
 108                 php_http_arrkey_t key;
 109                 php_http_params_opts_t opts;
 110
 111                 zend_hash_init(&params, 10, NULL, ZVAL_PTR_DTOR, 0);
 112                 php_http_params_opts_default_get(&opts);
 113                 opts.input.str = estrndup(value_str, value_len);
 114                 opts.input.len = value_len;
 115                 php_http_params_parse(&params, &opts);
 116                 efree(opts.input.str);
 117
 118                 array_init(&arr);
 119
 120                 ZEND_HASH_FOREACH_KEY_VAL(&params, key.h, key.key, val)
 121                 {
 122                         double q;
 123
 124                         if ((arg = zend_hash_str_find(Z_ARRVAL_P(val), ZEND_STRL("arguments")))
 125                         &&      (IS_ARRAY == Z_TYPE_P(arg))
 126                         &&      (zq = zend_hash_str_find(Z_ARRVAL_P(arg), ZEND_STRL("q")))) {
 127                                 q = zval_get_double(zq);
 128                         } else {
 129                                 q = 1.0 - ++i / 100.0;
 130                         }
 131
 132 #if 0
 133                         fprintf(stderr, "Q: %s=%1.3f\n", key.key->val, q);
 134 #endif
 135
 136                         if (key.key) {
 137                                 add_assoc_double_ex(&arr, key.key->val, key.key->len, q);
 138                         } else {
 139                                 add_index_double(&arr, key.h, q);
 140                         }
 141
 142                 }
 143                 ZEND_HASH_FOREACH_END();
 144
 145 #if 0
 146                 zend_print_zval_r(&arr, 1);
 147 #endif
 148
 149                 ALLOC_HASHTABLE(result);
 150                 zend_hash_init(result, zend_hash_num_elements(supported), NULL, ZVAL_PTR_DTOR, 0);
 151                 zend_hash_apply_with_arguments(supported, php_http_negotiate_reduce, 4, Z_ARRVAL(arr), result, primary_sep_str, primary_sep_len);
 152                 zend_hash_destroy(&params);
 153                 zval_dtor(&arr);
 154                 zend_hash_sort(result, php_http_negotiate_sort, 0);
 155         }
 156
 157         return result;
 158 }
 159
 160
 161
 162 /*
 163  * Local variables:
 164  * tab-width: 4
 165  * c-basic-offset: 4
 166  * End:
 167  * vim600: noet sw=4 ts=4 fdm=marker
 168  * vim<600: noet sw=4 ts=4
 169  */
 170
 171