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 *a, const void *b TSRMLS_DC)
  16 {
  17         zval result, *first, *second;
  18
  19         first = *((zval **) (*((Bucket **) a))->pData);
  20         second= *((zval **) (*((Bucket **) b))->pData);
  21
  22         if (numeric_compare_function(&result, first, second TSRMLS_CC) != SUCCESS) {
  23                 return 0;
  24         }
  25         return (Z_LVAL(result) > 0 ? -1 : (Z_LVAL(result) < 0 ? 1 : 0));
  26 }
  27
  28 #define M_PRI 5
  29 #define M_SEC 2
  30 #define M_ANY 1
  31 #define M_NOT 0
  32 #define M_ALL -1
  33 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)
  34 {
  35         int match = M_NOT;
  36
  37         if (param_len == supported_len && !strncasecmp(param_str, supported_str, param_len)) {
  38                 /* that was easy */
  39                 match = M_ALL;
  40         } else if (sep_str && sep_len) {
  41                 const char *param_sec = php_http_locate_str(param_str, param_len, sep_str, sep_len);
  42                 size_t param_pri_len = param_sec ? param_sec - param_str : param_len;
  43                 const char *supported_sec = php_http_locate_str(supported_str, supported_len, sep_str, sep_len);
  44                 size_t supported_pri_len = supported_sec ? supported_sec - supported_str : supported_len;
  45                 size_t cmp_len = MIN(param_pri_len, supported_pri_len);
  46
  47                 if (((*param_str == '*') || (*supported_str == '*'))
  48                 ||      ((param_pri_len == supported_pri_len) && !strncasecmp(param_str, supported_str, param_pri_len))
  49                 ||      ((!param_sec || !supported_sec) && cmp_len && !strncasecmp(param_str, supported_str, cmp_len))
  50                 ) {
  51                         match += M_PRI;
  52                 }
  53
  54                 if (param_sec && supported_sec && !strcasecmp(param_sec, supported_sec)) {
  55                         match += M_SEC;
  56                 }
  57
  58                 if ((param_sec && *(param_sec + sep_len) == '*')
  59                 ||      (supported_sec && *(supported_sec + sep_len) == '*')
  60                 ||      ((*param_str == '*') || (*supported_str == '*'))
  61                 ) {
  62                         match += M_ANY;
  63                 }
  64         }
  65 #if 0
  66         fprintf(stderr, "match: %s == %s => %u\n", supported_str, param_str, match);
  67 #endif
  68         return match;
  69 }
  70
  71 static int php_http_negotiate_reduce(void *p TSRMLS_DC, int num_args, va_list args, zend_hash_key *hash_key)
  72 {
  73         unsigned best_match = 0;
  74         HashPosition pos;
  75         php_http_array_hashkey_t key = php_http_array_hashkey_init(0);
  76         zval **q = NULL, **val, *supported = php_http_ztyp(IS_STRING, *(zval **)p);
  77         HashTable *params = va_arg(args, HashTable *);
  78         HashTable *result = va_arg(args, HashTable *);
  79         const char *sep_str = va_arg(args, const char *);
  80         size_t sep_len = va_arg(args, size_t);
  81
  82         FOREACH_HASH_KEYVAL(pos, params, key, val) {
  83                 if (key.type == HASH_KEY_IS_STRING) {
  84                         unsigned match = php_http_negotiate_match(key.str, key.len-1, Z_STRVAL_P(supported), Z_STRLEN_P(supported), sep_str, sep_len);
  85
  86                         if (match > best_match) {
  87                                 best_match = match;
  88                                 q = val;
  89                         }
  90                 }
  91         }
  92
  93         if (q && Z_DVAL_PP(q) > 0) {
  94                 Z_ADDREF_PP(q);
  95                 zend_hash_update(result, Z_STRVAL_P(supported), Z_STRLEN_P(supported) + 1, (void *) q, sizeof(zval *), NULL);
  96         }
  97
  98         zval_ptr_dtor(&supported);
  99         return ZEND_HASH_APPLY_KEEP;
 100 }
 101
 102 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)
 103 {
 104         HashTable *result = NULL;
 105
 106         if (value_str && value_len) {
 107                 unsigned i = 0;
 108                 zval arr, **val, **arg, **zq;
 109                 HashPosition pos;
 110                 HashTable params;
 111                 php_http_array_hashkey_t key = php_http_array_hashkey_init(1);
 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                 INIT_PZVAL(&arr);
 122                 array_init(&arr);
 123
 124                 FOREACH_HASH_KEYVAL(pos, &params, key, val) {
 125                         double q;
 126
 127                         if (SUCCESS == zend_hash_find(Z_ARRVAL_PP(val), ZEND_STRS("arguments"), (void *) &arg)
 128                         &&      IS_ARRAY == Z_TYPE_PP(arg)
 129                         &&      SUCCESS == zend_hash_find(Z_ARRVAL_PP(arg), ZEND_STRS("q"), (void *) &zq)) {
 130                                 zval *tmp = php_http_ztyp(IS_DOUBLE, *zq);
 131
 132                                 q = Z_DVAL_P(tmp);
 133                                 zval_ptr_dtor(&tmp);
 134                         } else {
 135                                 q = 1.0 - ++i / 100.0;
 136                         }
 137
 138                         if (key.type == HASH_KEY_IS_STRING) {
 139                                 add_assoc_double_ex(&arr, key.str, key.len, q);
 140                         } else {
 141                                 add_index_double(&arr, key.num, q);
 142                         }
 143
 144                         PTR_FREE(key.str);
 145                 }
 146
 147 #if 0
 148                 zend_print_zval_r(&arr, 1 TSRMLS_CC);
 149 #endif
 150
 151                 ALLOC_HASHTABLE(result);
 152                 zend_hash_init(result, zend_hash_num_elements(supported), NULL, ZVAL_PTR_DTOR, 0);
 153                 zend_hash_apply_with_arguments(supported TSRMLS_CC, php_http_negotiate_reduce, 4, Z_ARRVAL(arr), result, primary_sep_str, primary_sep_len);
 154                 zend_hash_destroy(&params);
 155                 zval_dtor(&arr);
 156                 zend_hash_sort(result, zend_qsort, php_http_negotiate_sort, 0 TSRMLS_CC);
 157         }
 158
 159         return result;
 160 }
 161
 162
 163
 164 /*
 165  * Local variables:
 166  * tab-width: 4
 167  * c-basic-offset: 4
 168  * End:
 169  * vim600: noet sw=4 ts=4 fdm=marker
 170  * vim<600: noet sw=4 ts=4
 171  */
 172
 173