Implement regexp support for cookies encryption

It's now possible to encrypt cookies matching a specific regexp.

This should close #106 

1 files changed, 24 insertions, 11 deletions

diff --git a/src/sp_cookie_encryption.c b/src/sp_cookie_encryption.c
index 04c864f..4e9818f 100644
--- a/src/sp_cookie_encryption.c
+++ b/src/sp_cookie_encryption.c
@@ -39,21 +39,34 @@ static inline void generate_key(unsigned char *key) {
   PHP_SHA256Final((unsigned char *)key, &ctx);
 }
 
+static inline const sp_cookie *sp_lookup_cookie_config(const char *key) {
+  sp_list_node *it = SNUFFLEUPAGUS_G(config).config_cookie->cookies;
+  
+  while (it) {
+  const sp_cookie *config = it->data;
+    if (config && sp_match_value(key, config->name, config->name_r)) {
+      return config;
+    }
+    it = it->next;
+  }
+  return NULL;
+}
+
+/* called at RINIT time with each cookie, eventually decrypt said cookie */
 int decrypt_cookie(zval *pDest, int num_args, va_list args,
                    zend_hash_key *hash_key) {
   unsigned char key[crypto_secretbox_KEYBYTES] = {0};
   zend_string *debase64;
   unsigned char *decrypted;
-  sp_cookie *cookie = zend_hash_find_ptr(SNUFFLEUPAGUS_G(config).config_cookie->cookies,
-                                         hash_key->key);
+  const sp_cookie *cookie = sp_lookup_cookie_config(ZSTR_VAL(hash_key->key));
   int ret = 0;
-
+  
   /* If the cookie isn't in the conf, it shouldn't be encrypted. */
   if (!cookie || !cookie->encrypt) {
     return ZEND_HASH_APPLY_KEEP;
   }
 
-        /* If the cookie has no value, it shouldn't be encrypted. */
+  /* If the cookie has no value, it shouldn't be encrypted. */
   if (0 == Z_STRLEN_P(pDest)) {
     return ZEND_HASH_APPLY_KEEP;
   }
@@ -107,10 +120,10 @@ int decrypt_cookie(zval *pDest, int num_args, va_list args,
   return ZEND_HASH_APPLY_KEEP;
 }
 
-/**
-  This function will return the `data` of length `data_len` encrypted in the
-  form `base64(nonce | encrypted_data)` (with `|` being the concatenation
-  operation).
+/*
+** This function will return the `data` of length `data_len` encrypted in the
+** form `base64(nonce | encrypted_data)` (with `|` being the concatenation
+** operation).
 */
 static zend_string *encrypt_data(char *data, unsigned long long data_len) {
   const size_t encrypted_msg_len = crypto_secretbox_ZEROBYTES + data_len + 1;
@@ -182,9 +195,9 @@ PHP_FUNCTION(sp_setcookie) {
     }
   }
 
-  cookie_node =
-    zend_hash_find_ptr(SNUFFLEUPAGUS_G(config).config_cookie->cookies, name);
-
+  /* lookup existing configuration for said cookie */
+  cookie_node = sp_lookup_cookie_config(ZSTR_VAL(name));
+  
   /* If the cookie's value is encrypted, it won't be usable by
    * javascript anyway.
    */