introduced extension hooks framework

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
@@ -1,142 +1,145 @@
 #ifndef __OPKELE_CONSUMER_H
 #define __OPKELE_CONSUMER_H
 
 #include <opkele/types.h>
+#include <opkele/extension.h>
 
 /**
  * @file
  * @brief OpenID consumer-side functionality
  */
 
 /**
  * @brief the main opkele namespace
  */
 namespace opkele {
 
     /**
      * implementation of basic consumer functionality
      */
     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.
 	     * @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
 	     */
 	    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.
 	     * @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
 	     */
-	    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.
 	     * @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
 	     */
-	    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
 	     * @param p request parameters
 	     */
 	    void check_authentication(const string& server,const params_t& p);
 
 	    /**
 	     * make URL canonical, by adding http:// and trailing slash, if needed.
 	     * @param url
 	     * @return canonicalized url
 	     */
 	    static string canonicalize(const string& url);
 
     };
 
 }
 
 #endif /* __OPKELE_CONSUMER_H */
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
@@ -144,67 +144,77 @@ namespace opkele {
 	    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) { }
     };
 
     /**
      * 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) { }
+    };
+
 }
 
 #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
@@ -1,95 +1,99 @@
 #ifndef __OPKELE_SERVER_H
 #define __OPKELE_SERVER_H
 
 /**
  * @file
  * @brief OpenID server-side functionality
  */
 
 #include <opkele/types.h>
+#include <opkele/extension.h>
 
 /**
  * @brief the main opkele namespace
  */
 namespace opkele {
 
     /**
      * implementation of basic server functionality
      */
     class server_t {
 	public:
 
 	    /**
 	     * allocate the new association. The function should be overridden
 	     * in the real implementation to provide persistent assocations
 	     * store.
 	     * @param mode the mode of request being processed to base the
 	     * statelessness of the association upon
 	     * @return the auto_ptr<> for the newly allocated association_t object
 	     */
 	    virtual assoc_t alloc_assoc(mode_t mode) = 0;
 	    /**
 	     * retrieve the association. The function should be overridden in
 	     * the reqal implementation to provide persistent assocations
 	     * store.
 	     * @param h association handle
 	     * @return the auto_ptr<> for the newly allocated association_t object
 	     * @throw failed_lookup in case of failure
 	     */
 	    virtual assoc_t retrieve_assoc(const string& h) = 0;
 
 	    /**
 	     * validate the identity.
 	     * @param assoc association object
 	     * @param pin incoming request parameters
 	     * @param identity being verified
 	     * @param trust_root presented in the request
 	     * @throw exception if identity can not be confirmed
 	     */
 	    virtual void validate(const association_t& assoc,const params_t& pin,const string& identity,const string& trust_root) = 0;
 
 
 	    /**
 	     * process the associate request.
 	     * @param pin the incoming request parameters
 	     * @param pout the store for the response parameters
 	     */
 	    void associate(const params_t& pin,params_t& pout);
 	    /**
 	     * process the checkid_immediate 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_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()
 	     * @param mode the request being processed (either
 	     * mode_checkid_immediate or mode_checkid_setup)
 	     * @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
 	     * @param pout response parameters
 	     */
 	    void check_authentication(const params_t& pin,params_t& pout);
     };
 
 }
 
 #endif /* __OPKELE_SERVER_H */