1 files changed, 53 insertions, 0 deletions
diff --git a/src/auth/auth-cache.h b/src/auth/auth-cache.h
new file mode 100644
index 0000000..ab02fe5
--- /dev/null
+++ b/src/auth/auth-cache.h
@@ -0,0 +1,53 @@
+#ifndef AUTH_CACHE_H
+#define AUTH_CACHE_H
+
+struct auth_cache_node {
+	struct auth_cache_node *prev, *next;
+
+	time_t created;
+	/* Total number of bytes used by this node */
+	uint32_t alloc_size:31;
+	/* TRUE if the user gave the correct password the last time. */
+	bool last_success:1;
+
+	char data[]; /* key \0 value \0 */
+};
+
+struct auth_cache;
+struct auth_request;
+
+/* Parses all %x variables from query and compresses them into tab-separated
+   list, so it can be used as a cache key. */
+char *auth_cache_parse_key(pool_t pool, const char *query);
+
+/* Create a new cache. max_size specifies the maximum amount of memory in
+   bytes to use for cache (it's not fully exact). ttl_secs specifies time to
+   live for cache record, requests older than that are not used.
+   neg_ttl_secs specifies the TTL for negative entries. */
+struct auth_cache *auth_cache_new(size_t max_size, unsigned int ttl_secs,
+				  unsigned int neg_ttl_secs);
+void auth_cache_free(struct auth_cache **cache);
+
+/* Clear the cache. Returns how many entries were removed. */
+unsigned int ATTR_NOWARN_UNUSED_RESULT
+auth_cache_clear(struct auth_cache *cache);
+unsigned int auth_cache_clear_users(struct auth_cache *cache,
+				    const char *const *usernames);
+
+/* Look key from cache. key should be the same string as returned by
+   auth_cache_parse_key(). Returned node can't be used after any other
+   auth_cache_*() calls. */
+const char *
+auth_cache_lookup(struct auth_cache *cache, const struct auth_request *request,
+		  const char *key, struct auth_cache_node **node_r,
+		  bool *expired_r, bool *neg_expired_r);
+/* Insert key => value into cache. "" value means negative cache entry. */
+void auth_cache_insert(struct auth_cache *cache, struct auth_request *request,
+		       const char *key, const char *value, bool last_success);
+
+/* Remove key from cache */
+void auth_cache_remove(struct auth_cache *cache,
+		       const struct auth_request *request,
+		       const char *key);
+
+#endif