Minor improvements

- almost irrelevant documentation updates
- introduced id_res_expired_on_delivery exception to be thrown if the
  association has expired right before it could've been used for signature
  verification.

Signed-off-by: Michael Krelin <hacker@klever.net>

2 files changed, 15 insertions, 0 deletions

diff --git a/include/opkele/consumer.h b/include/opkele/consumer.h
index 50ff692..c463787 100644
--- a/include/opkele/consumer.h
+++ b/include/opkele/consumer.h
@@ -1,168 +1,174 @@
 #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:
 
             virtual ~consumer_t() { }
 
             /**
              * 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 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.
              *
+             * @note
+             * It may be a good idea to pre-expire associations shortly before
+             * their time is really up to avoid association expiry in the
+             * middle of negotiations.
+             *
              * @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)
              */
             virtual void retrieve_links(const string& url,string& server,string& delegate);
 
             /**
              * perform the associate request to OpenID server.
              * @param server the OpenID server
              * @return the auto_ptr<> for the newly allocated association_t
              * object, representing established association
              * @throw exception in case of error
              */
             assoc_t associate(const string& server);
             /**
              * prepare the parameters for the checkid_immediate
              * request.
              * @param identity the identity to verify
              * @param return_to the return_to url to pass with the request
              * @param trust_root the trust root to advertise with the request
              * @param ext pointer to an extension(s) hooks object
              * @return the location string
              * @throw exception in case of error
              */
             virtual string checkid_immediate(const string& identity,const string& return_to,const string& trust_root="",extension_t *ext=0);
             /**
              * prepare the parameters for the checkid_setup
              * request.
              * @param identity the identity to verify
              * @param return_to the return_to url to pass with the request
              * @param trust_root the trust root to advertise with the request
              * @param ext pointer to an extension(s) hooks object
              * @return the location string
              * @throw exception in case of error
              */
             virtual string checkid_setup(const string& identity,const string& return_to,const string& trust_root="",extension_t *ext=0);
             /**
              * the actual implementation behind checkid_immediate() and
              * checkid_setup() functions.
              * @param mode checkid_* mode - either mode_checkid_immediate or mode_checkid_setup
              * @param identity the identity to verify
              * @param return_to the return_to url to pass with the request
              * @param trust_root the trust root to advertise with the request
              * @param ext pointer to an extension(s) hooks object
              * @return the location string
              * @throw exception in case of error
              */
             virtual string checkid_(mode_t mode,const string& identity,const string& return_to,const string& trust_root="",extension_t *ext=0);
             /**
              * verify the id_res response
              * @param pin the response parameters
              * @param identity the identity being checked (if not specified,
              * @param ext pointer to an extension(s) hooks object
              * extracted from the openid.identity parameter
              * @throw id_res_mismatch in case of signature mismatch
              * @throw id_res_setup in case of openid.user_setup_url failure
              * (supposedly checkid_immediate only)
              * @throw id_res_failed in case of failure
+             * @throw id_res_expired_on_delivery if the association expired before it could've been verified
              * @throw exception in case of other failures
              */
             virtual void id_res(const params_t& pin,const string& identity="",extension_t *ext=0);
             /**
              * perform a check_authentication request.
              * @param server the OpenID server
              * @param p request parameters
              */
             void check_authentication(const string& server,const params_t& p);
 
             /**
              * normalize URL by adding http:// and trailing slash if needed.
              * @param url
              * @return normalized url
              */
             static string normalize(const string& url);
 
             /**
              * Canonicalize URL, by normalizing its appearance and following redirects.
              * @param url
              * @return canonicalized url
              */
             virtual string canonicalize(const string& url);
 
     };
 
 }
 
 #endif /* __OPKELE_CONSUMER_H */
diff --git a/include/opkele/exception.h b/include/opkele/exception.h
index 753a818..2ff44b7 100644
--- a/include/opkele/exception.h
+++ b/include/opkele/exception.h
@@ -77,150 +77,159 @@ namespace opkele {
                 exception(const string& w)
                     : _what(w) { } 
             virtual ~exception() throw();
             virtual const char * what() const throw();
 #           endif /* OPKELE_HAVE_KONFORKA */
     };
 
     /**
      * thrown in case of failed conversion
      */
     class failed_conversion : public exception {
         public:
             failed_conversion(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
     /**
      * thrown in case of failed lookup (either parameter or persistent store)
      */
     class failed_lookup : public exception {
         public:
             failed_lookup(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
     /**
      * thrown in case of bad input (either local or network)
      */
     class bad_input : public exception {
         public:
             bad_input(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
 
     /**
      * thrown on failed assertion
      */
     class failed_assertion : public exception {
         public:
             failed_assertion(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
 
     /**
      * thrown if the handle being retrieved is invalid
      */
     class invalid_handle : public exception {
         public:
             invalid_handle(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
     /**
      * thrown if the handle passed to check_authentication request is not
      * stateless
      */
     class stateful_handle : public exception {
         public:
             stateful_handle(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
 
     /**
      * thrown if check_authentication request fails
      */
     class failed_check_authentication : public exception {
         public:
             failed_check_authentication(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
 
     /**
      * thrown if the id_res request result is negative
      */
     class id_res_failed : public exception {
         public:
             id_res_failed(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
     /**
      * thrown if the user_setup_url is provided with negative response
      */
     class id_res_setup : public id_res_failed {
         public:
             string setup_url;
             id_res_setup(OPKELE_E_PARS,const string& su)
                 : id_res_failed(OPKELE_E_CONS), setup_url(su) { }
             ~id_res_setup() throw() { }
     };
     /**
      * thrown in case of signature mismatch
      */
     class id_res_mismatch : public id_res_failed {
         public:
             id_res_mismatch(OPKELE_E_PARS)
                 : id_res_failed(OPKELE_E_CONS) { }
     };
 
     /**
+     * thrown if the association has expired before it could've been verified.
+     */
+    class id_res_expired_on_delivery : public id_res_failed {
+        public:
+            id_res_expired_on_delivery(OPKELE_E_PARS)
+                : id_res_failed(OPKELE_E_CONS) { }
+    };
+
+    /**
      * openssl malfunction occured
      */
     class exception_openssl : public exception {
         public:
             unsigned long _error;
             string _ssl_string;
             exception_openssl(OPKELE_E_PARS);
             ~exception_openssl() throw() { }
     };
 
     /**
      * network operation related error occured
      */
     class exception_network : public exception {
         public:
             exception_network(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
 
     /**
      * network operation related error occured, specifically, related to
      * libcurl
      */
     class exception_curl : public exception_network {
         public:
             CURLcode _error;
             string _curl_string;
             exception_curl(OPKELE_E_PARS);
             exception_curl(OPKELE_E_PARS,CURLcode e);
             ~exception_curl() throw() { }
     };
 
     /**
      * not implemented (think pure virtual) member function executed, signfies
      * programmer error
      */
     class not_implemented : public exception {
         public:
             not_implemented(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
 
     /**
      * internal error, indicates internal libopkele problem
      */
     class internal_error : public exception {
         public:
             internal_error(OPKELE_E_PARS)
                 : exception(OPKELE_E_CONS) { }
     };
 
 }
 
 #endif /* __OPKELE_EXCEPTION_H */