2 files changed, 20 insertions, 1 deletions

diff --git a/include/opkele/association.h b/include/opkele/association.h
index a8f3915..72eff5b 100644
--- a/include/opkele/association.h
+++ b/include/opkele/association.h
@@ -48,21 +48,23 @@ namespace opkele {
              * @param __secret the secret
              * @param __expires expiration time
              * @param __stateless statelessness of the assoc_handle
              */
             association(const string& __server, const string& __handle,
                     const string& __assoc_type, const secret_t& __secret,
                     time_t __expires, bool __stateless)
                 : _server(__server), _handle(__handle), _assoc_type(__assoc_type),
                 _secret(__secret), _expires(__expires), _stateless(__stateless) { }
 
             virtual string server() const { return _server; }
             virtual string handle() const { return _handle; }
             virtual string assoc_type() const { return _assoc_type; }
             virtual secret_t secret() const { return _secret; }
             virtual int expires_in() const { return _expires-time(0); }
             virtual bool stateless() const { return _stateless; }
+
+            virtual bool is_expired() const { return _expires<time(0); }
     };
 
 }
 
 #endif /* __OPKELE_ASSOCIATION_H */
diff --git a/include/opkele/consumer.h b/include/opkele/consumer.h
index 042e2d1..b9d1e54 100644
--- a/include/opkele/consumer.h
+++ b/include/opkele/consumer.h
@@ -1,66 +1,83 @@
 #ifndef __OPKELE_CONSUMER_H
 #define __OPKELE_CONSUMER_H
 
 #include <opkele/types.h>
 #include <opkele/extension.h>
 
 /**
  * @file
  * @brief OpenID consumer-side functionality
  */
 
 namespace opkele {
 
     /**
      * implementation of basic consumer functionality
+     *
+     * @note
+     * The consumer uses libcurl internally, which means that if you're using
+     * libopkele in multithreaded environment you should call curl_global_init
+     * yourself before spawning any threads.
      */
     class consumer_t {
         public:
 
             /**
              * store association. The function should be overridden in the real
              * implementation to provide persistent associations store.
              * @param server the OpenID server
              * @param handle association handle
              * @param secret the secret associated with the server and handle
              * @param expires_in the number of seconds until the handle is expired
              * @return the auto_ptr<> for the newly allocated association_t object
              */
             virtual assoc_t store_assoc(const string& server,const string& handle,const secret_t& secret,int expires_in) = 0;
             /**
              * retrieve stored association. The function should be overridden
              * in the real implementation to provide persistent assocations
              * store.
+             *
+             * @note
+             * The user is responsible for handling associations expiry and
+             * this function should never return an expired or invalidated
+             * association.
+             *
              * @param server the OpenID server
              * @param handle association handle
              * @return the autho_ptr<> for the newly allocated association_t object
-             * @throw failed_lookup in case of error
+             * @throw failed_lookup if no unexpired association found
              */
             virtual assoc_t retrieve_assoc(const string& server,const string& handle) = 0;
             /**
              * invalidate stored association. The function should be overridden
              * in the real implementation of the consumer.
              * @param server the OpenID server
              * @param handle association handle
              */
             virtual void invalidate_assoc(const string& server,const string& handle) = 0;
             /**
              * retrieve any unexpired association for the server. If the
              * function is not overridden in the real implementation, the new
              * association will be established for each request.
+             *
+             * @note
+             * The user is responsible for handling associations and this
+             * function should never return an expired or invalidated
+             * association.
+             *
              * @param server the OpenID server
              * @return the auto_ptr<> for the newly allocated association_t object
              * @throw failed_lookup in case of absence of the handle
              */
             virtual assoc_t find_assoc(const string& server);
 
             /**
              * retrieve the metainformation contained in link tags from the
              * page pointed by url. the function may implement caching of the
              * information.
              * @param url url to harvest for link tags
              * @param server reference to the string object where to put
              * openid.server value
              * @param delegate reference to the string object where to put the
              * openid.delegate value (if any)
              */