git.m6w6.name Git - m6w6/ext-http/blob - 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 TSRMLS_DC)
  16 {
  17         zval result;
  18         Bucket *b1 = (Bucket *) first, *b2 = (Bucket *) second;
  19
  20         if (numeric_compare_function(&result, &b1->val, &b2->val)!= SUCCESS) {
  21                 return 0;
  22         }
  23         return (Z_LVAL(result) > 0 ? -1 : (Z_LVAL(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 && !strcasecmp(param_sec, supported_sec)) {
  53                         match += M_SEC;
  54                 }
  55
  56                 if ((param_sec && *(param_sec + sep_len) == '*')
  57                 ||      (supported_sec && *(supported_sec + sep_len) == '*')
  58                 ||      ((*param_str == '*') || (*supported_str == '*'))
  59                 ) {
  60                         match += M_ANY;
  61                 }
  62         }
  63 #if 0
  64         fprintf(stderr, "match: %s == %s => %u\n", supported_str, param_str, match);
  65 #endif
  66         return match;
  67 }
  68 static int php_http_negotiate_reduce(zval *p, int num_args, va_list args, zend_hash_key *hash_key)
  69 {
  70         unsigned best_match = 0;
  71         php_http_arrkey_t key;
  72         zval *value, *q = NULL;
  73         zend_string *supported = zval_get_string(p);
  74         HashTable *params = va_arg(args, HashTable *);
  75         HashTable *result = va_arg(args, HashTable *);
  76         const char *sep_str = va_arg(args, const char *);
  77         size_t sep_len = va_arg(args, size_t);
  78
  79         ZEND_HASH_FOREACH_KEY_VAL(params, key.h, key.key, value)
  80         {
  81                 unsigned match;
  82
  83                 php_http_arrkey_stringify(&key, NULL);
  84                 match = php_http_negotiate_match(key.key->val, key.key->len, supported->val, supported->len, sep_str, sep_len);
  85
  86                 if (match > best_match) {
  87                         best_match = match;
  88                         q = value;
  89                 }
  90                 php_http_arrkey_dtor(&key);
  91         }
  92         ZEND_HASH_FOREACH_END();
  93
  94         if (q && Z_DVAL_P(q) > 0) {
  95                 Z_TRY_ADDREF_P(q);
  96                 zend_hash_update(result, supported, q);
  97         }
  98
  99         zend_string_release(supported);
 100         return ZEND_HASH_APPLY_KEEP;
 101 }
 102
 103 HashTable *php_http_negotiate(const char *value_str, size_t value_len, HashTable *supported, const char *primary_sep_str, size_t primary_sep_len TSRMLS_DC)
 104 {
 105         HashTable *result = NULL;
 106
 107         if (value_str && value_len) {
 108                 unsigned i = 0;
 109                 zval arr, *val, *arg, *zq;
 110                 HashTable params;
 111                 php_http_arrkey_t key;
 112                 php_http_params_opts_t opts;
 113
 114                 zend_hash_init(&params, 10, NULL, ZVAL_PTR_DTOR, 0);
 115                 php_http_params_opts_default_get(&opts);
 116                 opts.input.str = estrndup(value_str, value_len);
 117                 opts.input.len = value_len;
 118                 php_http_params_parse(&params, &opts TSRMLS_CC);
 119                 efree(opts.input.str);
 120
 121                 array_init(&arr);
 122
 123                 ZEND_HASH_FOREACH_KEY_VAL(&params, key.h, key.key, val)
 124                 {
 125                         double q;
 126
 127                         if ((arg = zend_hash_str_find(Z_ARRVAL_P(val), ZEND_STRL("arguments")))
 128                         &&      (IS_ARRAY == Z_TYPE_P(arg))
 129                         &&      (zq = zend_hash_str_find(Z_ARRVAL_P(arg), ZEND_STRL("q")))) {
 130                                 q = zval_get_double(zq);
 131                         } else {
 132                                 q = 1.0 - ++i / 100.0;
 133                         }
 134
 135 #if 0
 136                         fprintf(stderr, "Q: %s=%1.3f\n", key.key->val, q);
 137 #endif
 138
 139                         if (key.key) {
 140                                 add_assoc_double_ex(&arr, key.key->val, key.key->len, q);
 141                         } else {
 142                                 add_index_double(&arr, key.h, q);
 143                         }
 144
 145                 }
 146                 ZEND_HASH_FOREACH_END();
 147
 148 #if 0
 149                 zend_print_zval_r(&arr, 1);
 150 #endif
 151
 152                 ALLOC_HASHTABLE(result);
 153                 zend_hash_init(result, zend_hash_num_elements(supported), NULL, ZVAL_PTR_DTOR, 0);
 154                 zend_hash_apply_with_arguments(supported, php_http_negotiate_reduce, 4, Z_ARRVAL(arr), result, primary_sep_str, primary_sep_len);
 155                 zend_hash_destroy(&params);
 156                 zval_dtor(&arr);
 157                 zend_hash_sort(result, php_http_negotiate_sort, 0);
 158         }
 159
 160         return result;
 161 }
 162
 163
 164
 165 /*
 166  * Local variables:
 167  * tab-width: 4
 168  * c-basic-offset: 4
 169  * End:
 170  * vim600: noet sw=4 ts=4 fdm=marker
 171  * vim<600: noet sw=4 ts=4
 172  */
 173
 174