4 files changed, 90 insertions, 14 deletions

diff --git a/include/opkele/consumer.h b/include/opkele/consumer.h
index 9932315..f9939cf 100644
--- a/include/opkele/consumer.h
+++ b/include/opkele/consumer.h
@@ -2,6 +2,7 @@
 #define __OPKELE_CONSUMER_H
 
 #include <opkele/types.h>
+#include <opkele/extension.h>
 
 /**
  * @file
@@ -82,20 +83,22 @@ namespace opkele {
              * @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
              */
-            string checkid_immediate(const string& identity,const string& return_to,const string& trust_root="");
+            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
              */
-            string checkid_setup(const string& identity,const string& return_to,const string& trust_root="");
+            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.
@@ -103,24 +106,24 @@ namespace opkele {
              * @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
              */
-            string checkid_(mode_t mode,const string& identity,const string& return_to,const string& trust_root="");
+            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, 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)
+             * @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 exception in case of other failures
              */
-            void id_res(const params_t& pin,const string& identity="");
+            void id_res(const params_t& pin,const string& identity="",extension_t *ext=0);
             /**
              * perform a check_authentication request.
              * @param server the OpenID server
diff --git a/include/opkele/exception.h b/include/opkele/exception.h
index c5f5811..9fc9bd3 100644
--- a/include/opkele/exception.h
+++ b/include/opkele/exception.h
@@ -205,6 +205,16 @@ namespace opkele {
             ~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) { }
+    };
+
 }
 
 #endif /* __OPKELE_EXCEPTION_H */
diff --git a/include/opkele/extension.h b/include/opkele/extension.h
new file mode 100644
index 0000000..3fb5f6e
--- a/dev/null
+++ b/include/opkele/extension.h
@@ -0,0 +1,59 @@
+#ifndef __OPKELE_EXTENSIONS_H
+#define __OPKELE_EXTENSIONS_H
+
+/**
+ * @file
+ * @brief extensions framework basics
+ */
+
+#include <opkele/types.h>
+
+/**
+ * @brief the main opkele namespace
+ */
+namespace opkele {
+
+    /**
+     * OpenID consumer extension hooks base class
+     */
+    class extension_t {
+        public:
+            /**
+             * hook called by consumer before submitting data to OpenID server.
+             * It is supposed to manipulate parameters list.
+             * @param p parameters about to be submitted to server
+             * @param identity identity being verified. It may differ from the
+             * one available in parameters list in case of delegation
+             */
+            virtual void checkid_hook(params_t& p,const string& identity);
+            /**
+             * hook called by consumer after identity information received from
+             * OpenID server is verified.
+             * @param p parameters received from server
+             * @param sp signed parameters received from server with 'openid.'
+             * leader stripped
+             * @param identity identity confirmed. May differ from the one
+             * available in parameters list in case of delegation. May also be
+             * empty which means - extract one from parameters
+             */
+            virtual void id_res_hook(const params_t& p,const params_t& sp,const string& identity);
+
+            /**
+             * hook called by server before returning information to consumer.
+             * The hook may manipulate output parameters. It is important to
+             * note that modified pout["signed"] is used for signing response.
+             * @param pin request parameters list
+             * @param put response parameters list
+             */
+            virtual void checkid_hook(const params_t& pin,params_t& pout);
+
+            /**
+             * Casts the object to pointer to itself. For convenient passing
+             * of pointer.
+             */
+            operator extension_t*(void) { return this; }
+    };
+
+}
+
+#endif /* __OPKELE_EXTENSIONS_H */
diff --git a/include/opkele/server.h b/include/opkele/server.h
index fe07448..bf131d8 100644
--- a/include/opkele/server.h
+++ b/include/opkele/server.h
@@ -7,6 +7,7 @@
  */
 
 #include <opkele/types.h>
+#include <opkele/extension.h>
 
 /**
  * @brief the main opkele namespace
@@ -60,17 +61,19 @@ namespace opkele {
              * @param pin the incoming request parameters
              * @param return_to reference to the object to store return_to url to
              * @param pout the response parameters
+             * @param ext pointer to the extension hooks object
              * @throw exception in case of errors or negative reply
              */
-            void checkid_immediate(const params_t& pin,string& return_to,params_t& pout);
+            void checkid_immediate(const params_t& pin,string& return_to,params_t& pout,extension_t *ext=0);
             /**
              * process the checkid_setup request.
              * @param pin the incoming request parameters
              * @param return_to reference to the object to store return_to url to
              * @param pout the response parameters
+             * @param ext pointer to the extension hooks object
              * @throw exception in case of errors or negative reply
              */
-            void checkid_setup(const params_t& pin,string& return_to,params_t& pout);
+            void checkid_setup(const params_t& pin,string& return_to,params_t& pout,extension_t *ext=0);
             /**
              * the actual functionality behind checkid_immediate() and
              * checkid_setup()
@@ -79,9 +82,10 @@ namespace opkele {
              * @param pin the incoming request parameters
              * @param return_to reference to the object to store return_to url to
              * @param pout the response parameters
+             * @param ext pointer to the extension hooks object
              * @throw exception in case of errors or negative reply
              */
-            void checkid_(mode_t mode,const params_t& pin,string& return_to,params_t& pout);
+            void checkid_(mode_t mode,const params_t& pin,string& return_to,params_t& pout,extension_t *ext=0);
             /**
              * process the check_authentication request.
              * @param pin incoming request parameters